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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>AllegroGL: texture.c Source File</title>
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<h1>texture.c</h1>  </div>
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<a href="texture_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* This code is (C) AllegroGL contributors, and double licensed under</span>
<a name="l00002"></a>00002 <span class="comment"> * the GPL and zlib licenses. See gpl.txt or zlib.txt for details.</span>
<a name="l00003"></a>00003 <span class="comment"> */</span>
<a name="l00008"></a>00008 <span class="preprocessor">#include &lt;string.h&gt;</span>
<a name="l00009"></a>00009 
<a name="l00010"></a>00010 <span class="preprocessor">#include &quot;alleggl.h&quot;</span>
<a name="l00011"></a>00011 <span class="preprocessor">#include &quot;allglint.h&quot;</span>
<a name="l00012"></a>00012 
<a name="l00013"></a>00013 <span class="preprocessor">#include &lt;allegro/internal/aintern.h&gt;</span>
<a name="l00014"></a>00014 
<a name="l00015"></a>00015 <span class="preprocessor">#ifdef ALLEGRO_MACOSX</span>
<a name="l00016"></a>00016 <span class="preprocessor"></span><span class="preprocessor">#include &lt;OpenGL/glu.h&gt;</span>
<a name="l00017"></a>00017 <span class="preprocessor">#else</span>
<a name="l00018"></a>00018 <span class="preprocessor"></span><span class="preprocessor">#include &lt;GL/glu.h&gt;</span>
<a name="l00019"></a>00019 <span class="preprocessor">#endif</span>
<a name="l00020"></a>00020 <span class="preprocessor"></span>
<a name="l00021"></a>00021 <span class="keyword">static</span> GLint allegro_gl_opengl_internal_texture_format = -1;
<a name="l00022"></a>00022 <span class="keyword">static</span> <span class="keywordtype">int</span> allegro_gl_use_mipmapping_for_textures = 0;
<a name="l00023"></a>00023 <span class="keywordtype">int</span> __allegro_gl_use_alpha = FALSE;
<a name="l00024"></a>00024 <span class="keywordtype">int</span> __allegro_gl_flip_texture = TRUE;
<a name="l00025"></a>00025 GLint __allegro_gl_texture_read_format[5];
<a name="l00026"></a>00026 GLint __allegro_gl_texture_components[5];
<a name="l00027"></a>00027 
<a name="l00028"></a>00028 <span class="preprocessor">#define PREFIX_I                &quot;agl-tex INFO: &quot;</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span><span class="preprocessor">#define PREFIX_W                &quot;agl-tex WARNING: &quot;</span>
<a name="l00030"></a>00030 <span class="preprocessor"></span><span class="preprocessor">#define PREFIX_E                &quot;agl-tex ERROR: &quot;</span>
<a name="l00031"></a>00031 <span class="preprocessor"></span>
<a name="l00032"></a>00032 
<a name="l00038"></a>00038 <span class="keywordtype">char</span> <span class="keyword">const</span> *__allegro_gl_get_format_description(GLint format)
<a name="l00039"></a>00039 {
<a name="l00040"></a>00040     <span class="keyword">static</span> <span class="keywordtype">char</span> str[256];
<a name="l00041"></a>00041 <span class="preprocessor">#define F(s) case s: return #s</span>
<a name="l00042"></a>00042 <span class="preprocessor"></span>    <span class="keywordflow">switch</span> (format) {
<a name="l00043"></a>00043         F(GL_ALPHA);
<a name="l00044"></a>00044         F(GL_ALPHA4);
<a name="l00045"></a>00045         F(GL_ALPHA8);
<a name="l00046"></a>00046         F(GL_ALPHA12);
<a name="l00047"></a>00047         F(GL_ALPHA16);
<a name="l00048"></a>00048         F(GL_ALPHA16F_ARB);
<a name="l00049"></a>00049         F(GL_ALPHA32F_ARB);
<a name="l00050"></a>00050         F(GL_INTENSITY);
<a name="l00051"></a>00051         F(GL_INTENSITY4);
<a name="l00052"></a>00052         F(GL_INTENSITY8);
<a name="l00053"></a>00053         F(GL_INTENSITY12);
<a name="l00054"></a>00054         F(GL_INTENSITY16);
<a name="l00055"></a>00055         F(GL_INTENSITY16F_ARB);
<a name="l00056"></a>00056         F(GL_INTENSITY32F_ARB);
<a name="l00057"></a>00057         F(GL_LUMINANCE);
<a name="l00058"></a>00058         F(GL_LUMINANCE4);
<a name="l00059"></a>00059         F(GL_LUMINANCE8);
<a name="l00060"></a>00060         F(GL_LUMINANCE12);
<a name="l00061"></a>00061         F(GL_LUMINANCE16);
<a name="l00062"></a>00062         F(GL_LUMINANCE16F_ARB);
<a name="l00063"></a>00063         F(GL_LUMINANCE32F_ARB);
<a name="l00064"></a>00064         F(GL_LUMINANCE_ALPHA);
<a name="l00065"></a>00065         F(GL_LUMINANCE4_ALPHA4);
<a name="l00066"></a>00066         F(GL_LUMINANCE12_ALPHA4);
<a name="l00067"></a>00067         F(GL_LUMINANCE8_ALPHA8);
<a name="l00068"></a>00068         F(GL_LUMINANCE6_ALPHA2);
<a name="l00069"></a>00069         F(GL_LUMINANCE12_ALPHA12);
<a name="l00070"></a>00070         F(GL_LUMINANCE16_ALPHA16);
<a name="l00071"></a>00071         F(GL_LUMINANCE_ALPHA16F_ARB);
<a name="l00072"></a>00072         F(GL_LUMINANCE_ALPHA32F_ARB);
<a name="l00073"></a>00073         F(GL_RGB);
<a name="l00074"></a>00074         F(GL_R3_G3_B2);
<a name="l00075"></a>00075         F(GL_RGB4);
<a name="l00076"></a>00076         F(GL_RGB5);
<a name="l00077"></a>00077         F(GL_RGB8);
<a name="l00078"></a>00078         F(GL_RGB10);
<a name="l00079"></a>00079         F(GL_RGB12);
<a name="l00080"></a>00080         F(GL_RGB16);
<a name="l00081"></a>00081         F(GL_RGB16F_ARB);
<a name="l00082"></a>00082         F(GL_RGB32F_ARB);
<a name="l00083"></a>00083         F(GL_RGBA);
<a name="l00084"></a>00084         F(GL_RGBA2);
<a name="l00085"></a>00085         F(GL_RGBA4);
<a name="l00086"></a>00086         F(GL_RGB5_A1);
<a name="l00087"></a>00087         F(GL_RGBA8);
<a name="l00088"></a>00088         F(GL_RGB10_A2);
<a name="l00089"></a>00089         F(GL_RGBA12);
<a name="l00090"></a>00090         F(GL_RGBA16);
<a name="l00091"></a>00091         F(GL_RGBA16F_ARB);
<a name="l00092"></a>00092         F(GL_RGBA32F_ARB);
<a name="l00093"></a>00093     }
<a name="l00094"></a>00094     uszprintf(str, <span class="keyword">sizeof</span> str, <span class="stringliteral">&quot;%x&quot;</span>, format);
<a name="l00095"></a>00095     <span class="keywordflow">return</span> str;
<a name="l00096"></a>00096 <span class="preprocessor">#undef F</span>
<a name="l00097"></a>00097 <span class="preprocessor"></span>}
<a name="l00098"></a>00098 
<a name="l00099"></a>00099 
<a name="l00100"></a>00100 
<a name="l00101"></a>00101 <span class="comment">/* int __allegro_gl_get_num_channels(GLenum format) */</span>
<a name="l00111"></a>00111 <span class="keywordtype">int</span> __allegro_gl_get_num_channels(GLenum format) {
<a name="l00112"></a>00112         
<a name="l00113"></a>00113     <span class="keywordflow">switch</span> (format) {
<a name="l00114"></a>00114     <span class="keywordflow">case</span> 1:
<a name="l00115"></a>00115     <span class="keywordflow">case</span> GL_ALPHA:
<a name="l00116"></a>00116     <span class="keywordflow">case</span> GL_ALPHA4:
<a name="l00117"></a>00117     <span class="keywordflow">case</span> GL_ALPHA8:
<a name="l00118"></a>00118     <span class="keywordflow">case</span> GL_ALPHA12:
<a name="l00119"></a>00119     <span class="keywordflow">case</span> GL_ALPHA16:
<a name="l00120"></a>00120     <span class="keywordflow">case</span> GL_ALPHA16F_ARB:
<a name="l00121"></a>00121     <span class="keywordflow">case</span> GL_ALPHA32F_ARB:
<a name="l00122"></a>00122     <span class="keywordflow">case</span> GL_INTENSITY:
<a name="l00123"></a>00123     <span class="keywordflow">case</span> GL_INTENSITY4:
<a name="l00124"></a>00124     <span class="keywordflow">case</span> GL_INTENSITY8:
<a name="l00125"></a>00125     <span class="keywordflow">case</span> GL_INTENSITY12:
<a name="l00126"></a>00126     <span class="keywordflow">case</span> GL_INTENSITY16:
<a name="l00127"></a>00127     <span class="keywordflow">case</span> GL_INTENSITY16F_ARB:
<a name="l00128"></a>00128     <span class="keywordflow">case</span> GL_INTENSITY32F_ARB:
<a name="l00129"></a>00129     <span class="keywordflow">case</span> GL_LUMINANCE:
<a name="l00130"></a>00130     <span class="keywordflow">case</span> GL_LUMINANCE4:
<a name="l00131"></a>00131     <span class="keywordflow">case</span> GL_LUMINANCE8:
<a name="l00132"></a>00132     <span class="keywordflow">case</span> GL_LUMINANCE12:
<a name="l00133"></a>00133     <span class="keywordflow">case</span> GL_LUMINANCE16:
<a name="l00134"></a>00134     <span class="keywordflow">case</span> GL_LUMINANCE16F_ARB:
<a name="l00135"></a>00135     <span class="keywordflow">case</span> GL_LUMINANCE32F_ARB:
<a name="l00136"></a>00136         <span class="keywordflow">return</span> 1;
<a name="l00137"></a>00137     <span class="keywordflow">case</span> 2:
<a name="l00138"></a>00138     <span class="keywordflow">case</span> GL_LUMINANCE_ALPHA:
<a name="l00139"></a>00139     <span class="keywordflow">case</span> GL_LUMINANCE4_ALPHA4:
<a name="l00140"></a>00140     <span class="keywordflow">case</span> GL_LUMINANCE12_ALPHA4:
<a name="l00141"></a>00141     <span class="keywordflow">case</span> GL_LUMINANCE8_ALPHA8:
<a name="l00142"></a>00142     <span class="keywordflow">case</span> GL_LUMINANCE6_ALPHA2:
<a name="l00143"></a>00143     <span class="keywordflow">case</span> GL_LUMINANCE12_ALPHA12:
<a name="l00144"></a>00144     <span class="keywordflow">case</span> GL_LUMINANCE16_ALPHA16:
<a name="l00145"></a>00145     <span class="keywordflow">case</span> GL_LUMINANCE_ALPHA16F_ARB:
<a name="l00146"></a>00146     <span class="keywordflow">case</span> GL_LUMINANCE_ALPHA32F_ARB:
<a name="l00147"></a>00147         <span class="keywordflow">return</span> 2;
<a name="l00148"></a>00148     <span class="keywordflow">case</span> 3:
<a name="l00149"></a>00149     <span class="keywordflow">case</span> GL_RGB:
<a name="l00150"></a>00150     <span class="keywordflow">case</span> GL_R3_G3_B2:
<a name="l00151"></a>00151     <span class="keywordflow">case</span> GL_RGB4:
<a name="l00152"></a>00152     <span class="keywordflow">case</span> GL_RGB5:
<a name="l00153"></a>00153     <span class="keywordflow">case</span> GL_RGB8:
<a name="l00154"></a>00154     <span class="keywordflow">case</span> GL_RGB10:
<a name="l00155"></a>00155     <span class="keywordflow">case</span> GL_RGB12:
<a name="l00156"></a>00156     <span class="keywordflow">case</span> GL_RGB16:
<a name="l00157"></a>00157     <span class="keywordflow">case</span> GL_RGB16F_ARB:
<a name="l00158"></a>00158     <span class="keywordflow">case</span> GL_RGB32F_ARB:
<a name="l00159"></a>00159         <span class="keywordflow">return</span> 3;
<a name="l00160"></a>00160     <span class="keywordflow">case</span> 4:
<a name="l00161"></a>00161     <span class="keywordflow">case</span> GL_RGBA:
<a name="l00162"></a>00162     <span class="keywordflow">case</span> GL_RGBA2:
<a name="l00163"></a>00163     <span class="keywordflow">case</span> GL_RGBA4:
<a name="l00164"></a>00164     <span class="keywordflow">case</span> GL_RGB5_A1:
<a name="l00165"></a>00165     <span class="keywordflow">case</span> GL_RGBA8:
<a name="l00166"></a>00166     <span class="keywordflow">case</span> GL_RGB10_A2:
<a name="l00167"></a>00167     <span class="keywordflow">case</span> GL_RGBA12:
<a name="l00168"></a>00168     <span class="keywordflow">case</span> GL_RGBA16:
<a name="l00169"></a>00169     <span class="keywordflow">case</span> GL_RGBA16F_ARB:
<a name="l00170"></a>00170     <span class="keywordflow">case</span> GL_RGBA32F_ARB:
<a name="l00171"></a>00171         <span class="keywordflow">return</span> 4;
<a name="l00172"></a>00172     <span class="keywordflow">default</span>:
<a name="l00173"></a>00173         <span class="keywordflow">return</span> 0;
<a name="l00174"></a>00174     }
<a name="l00175"></a>00175 }
<a name="l00176"></a>00176 
<a name="l00177"></a>00177 
<a name="l00178"></a>00178 
<a name="l00179"></a>00179 <span class="comment">/* GLint __allegro_gl_get_texture_format_ex(BITMAP *bmp, int flags) */</span>
<a name="l00190"></a>00190 GLint __allegro_gl_get_texture_format_ex(BITMAP *bmp, <span class="keywordtype">int</span> flags) {
<a name="l00191"></a>00191 
<a name="l00192"></a>00192     <span class="keywordflow">if</span> (!bmp) {
<a name="l00193"></a>00193         <span class="keywordflow">return</span> -1;
<a name="l00194"></a>00194     }
<a name="l00195"></a>00195 
<a name="l00196"></a>00196     <span class="keywordflow">switch</span> (bitmap_color_depth(bmp)) {
<a name="l00197"></a>00197         <span class="keywordflow">case</span> 32:
<a name="l00198"></a>00198             <span class="keywordflow">if</span> (flags
<a name="l00199"></a>00199                  &amp; (<a class="code" href="group__texture.html#ga8cc859eadf1610b424cd9188e716f432" title="Tell AllegroGL that the bitmap had an alpha channel, so it should be preserved when generating the te...">AGL_TEXTURE_HAS_ALPHA</a> | AGL_TEXTURE_FORCE_ALPHA_INTERNAL)) {
<a name="l00200"></a>00200                 <span class="keywordflow">return</span> GL_RGBA8;
<a name="l00201"></a>00201             }
<a name="l00202"></a>00202             <span class="keywordflow">else</span> {
<a name="l00203"></a>00203                 <span class="keywordflow">return</span> GL_RGB8;
<a name="l00204"></a>00204             }
<a name="l00205"></a>00205         <span class="keywordflow">case</span> 8:
<a name="l00206"></a>00206             <span class="keywordflow">return</span> GL_INTENSITY8;
<a name="l00207"></a>00207         <span class="keywordflow">case</span> 15:
<a name="l00208"></a>00208             <span class="keywordflow">if</span> (flags &amp; AGL_TEXTURE_FORCE_ALPHA_INTERNAL) {
<a name="l00209"></a>00209                 <span class="keywordflow">return</span> GL_RGB5_A1;
<a name="l00210"></a>00210             }
<a name="l00211"></a>00211             <span class="keywordflow">else</span> {
<a name="l00212"></a>00212                 <span class="keywordflow">return</span> GL_RGB5;
<a name="l00213"></a>00213             }
<a name="l00214"></a>00214         <span class="keywordflow">case</span> 16:
<a name="l00215"></a>00215         <span class="keywordflow">case</span> 24:
<a name="l00216"></a>00216             <span class="keywordflow">if</span> (flags &amp; AGL_TEXTURE_FORCE_ALPHA_INTERNAL) {
<a name="l00217"></a>00217                 <span class="keywordflow">return</span> GL_RGBA8;
<a name="l00218"></a>00218             }
<a name="l00219"></a>00219             <span class="keywordflow">else</span> {
<a name="l00220"></a>00220                 <span class="keywordflow">return</span> GL_RGB8;
<a name="l00221"></a>00221             }
<a name="l00222"></a>00222         <span class="keywordflow">default</span>:
<a name="l00223"></a>00223             <span class="keywordflow">return</span> -1;
<a name="l00224"></a>00224     }
<a name="l00225"></a>00225 
<a name="l00226"></a>00226     <span class="keywordflow">return</span> -1;
<a name="l00227"></a>00227 }
<a name="l00228"></a>00228 
<a name="l00229"></a>00229 
<a name="l00230"></a>00230 
<a name="l00231"></a>00231 <span class="comment">/* GLint allegro_gl_get_texture_format(BITMAP *bmp) */</span>
<a name="l00248"></a><a class="code" href="group__texture.html#ga2392fe7a8dd6db65532160821804aa68">00248</a> GLint <a class="code" href="group__texture.html#ga2392fe7a8dd6db65532160821804aa68" title="Returns the OpenGL internal texture format for this bitmap.">allegro_gl_get_texture_format</a>(BITMAP *bmp) {
<a name="l00249"></a>00249 
<a name="l00250"></a>00250     <span class="keywordflow">if</span> (bmp &amp;&amp; allegro_gl_opengl_internal_texture_format == -1) {
<a name="l00251"></a>00251         <span class="keywordflow">return</span> __allegro_gl_get_texture_format_ex(bmp,
<a name="l00252"></a>00252                 __allegro_gl_use_alpha ? AGL_TEXTURE_FORCE_ALPHA_INTERNAL : 0);
<a name="l00253"></a>00253     }
<a name="l00254"></a>00254     
<a name="l00255"></a>00255     <span class="keywordflow">return</span> allegro_gl_opengl_internal_texture_format;
<a name="l00256"></a>00256 }
<a name="l00257"></a>00257 
<a name="l00258"></a>00258 
<a name="l00259"></a>00259 
<a name="l00260"></a>00260 <span class="comment">/* GLint allegro_gl_set_texture_format(GLint format) */</span>
<a name="l00282"></a><a class="code" href="group__texture.html#ga5d535e8af776dd449cc4755b9e3585b1">00282</a> GLint <a class="code" href="group__texture.html#ga5d535e8af776dd449cc4755b9e3585b1" title="Sets the color format you&amp;#39;d like OpenGL to use for its textures.">allegro_gl_set_texture_format</a>(GLint format) {
<a name="l00283"></a>00283 
<a name="l00284"></a>00284     GLint old = allegro_gl_opengl_internal_texture_format;
<a name="l00285"></a>00285     allegro_gl_opengl_internal_texture_format = format;
<a name="l00286"></a>00286     <span class="keywordflow">return</span> old;
<a name="l00287"></a>00287 }
<a name="l00288"></a>00288 
<a name="l00289"></a>00289 
<a name="l00290"></a>00290 
<a name="l00291"></a>00291 <span class="comment">/* GLenum __allegro_gl_get_bitmap_type(BITMAP *bmp, int flags) */</span>
<a name="l00311"></a>00311 GLenum __allegro_gl_get_bitmap_type(BITMAP *bmp, <span class="keywordtype">int</span> flags) {
<a name="l00312"></a>00312 
<a name="l00313"></a>00313     <span class="keywordtype">int</span> c = bitmap_color_depth(bmp);
<a name="l00314"></a>00314 
<a name="l00315"></a>00315     <span class="keywordflow">switch</span> (c) {
<a name="l00316"></a>00316 
<a name="l00317"></a>00317         <span class="keywordflow">case</span> 8:
<a name="l00318"></a>00318             <span class="keywordflow">return</span> __allegro_gl_texture_read_format[0];
<a name="l00319"></a>00319 
<a name="l00320"></a>00320         <span class="keywordflow">case</span> 15:
<a name="l00321"></a>00321             <span class="keywordflow">return</span> __allegro_gl_texture_read_format[1];
<a name="l00322"></a>00322 
<a name="l00323"></a>00323         <span class="keywordflow">case</span> 16:
<a name="l00324"></a>00324             <span class="keywordflow">return</span> __allegro_gl_texture_read_format[2];
<a name="l00325"></a>00325 
<a name="l00326"></a>00326         <span class="keywordflow">case</span> 24:
<a name="l00327"></a>00327             <span class="keywordflow">return</span> __allegro_gl_texture_read_format[3];
<a name="l00328"></a>00328 
<a name="l00329"></a>00329         <span class="keywordflow">case</span> 32:
<a name="l00330"></a>00330             <span class="keywordflow">return</span> __allegro_gl_texture_read_format[4];
<a name="l00331"></a>00331     
<a name="l00332"></a>00332         <span class="keywordflow">default</span>:
<a name="l00333"></a>00333             TRACE(PREFIX_E <span class="stringliteral">&quot;get_bitmap_type: unhandled bitmap depth: %d\n&quot;</span>,
<a name="l00334"></a>00334                   c);
<a name="l00335"></a>00335             <span class="keywordflow">return</span> -1;
<a name="l00336"></a>00336     }
<a name="l00337"></a>00337 }
<a name="l00338"></a>00338 
<a name="l00339"></a>00339 
<a name="l00340"></a>00340 
<a name="l00341"></a>00341 <span class="comment">/* GLenum __allegro_gl_get_bitmap_color_format(BITMAP *bmp, int flags) */</span>
<a name="l00355"></a>00355 GLenum __allegro_gl_get_bitmap_color_format(BITMAP *bmp, <span class="keywordtype">int</span> flags) {
<a name="l00356"></a>00356 
<a name="l00357"></a>00357     <span class="keywordtype">int</span> c = bitmap_color_depth(bmp);
<a name="l00358"></a>00358 
<a name="l00359"></a>00359     <span class="keywordflow">switch</span> (c) {
<a name="l00360"></a>00360 
<a name="l00361"></a>00361         <span class="keywordflow">case</span> 8:
<a name="l00362"></a>00362             <span class="keywordflow">if</span> (flags &amp; <a class="code" href="group__texture.html#gad67cfdfd21ef2cae75b03cb871e57f4a" title="Tell AllegroGL that the specified BITMAP is an 8-bpp alpha-only BITMAP.">AGL_TEXTURE_ALPHA_ONLY</a>) {
<a name="l00363"></a>00363                 <span class="keywordflow">return</span> GL_ALPHA;
<a name="l00364"></a>00364             }
<a name="l00365"></a>00365             <span class="keywordflow">else</span> {
<a name="l00366"></a>00366                 <span class="keywordflow">return</span> __allegro_gl_texture_components[0];
<a name="l00367"></a>00367             }
<a name="l00368"></a>00368 
<a name="l00369"></a>00369         <span class="keywordflow">case</span> 15:
<a name="l00370"></a>00370             <span class="keywordflow">if</span> (flags &amp; AGL_TEXTURE_FORCE_ALPHA_INTERNAL) {
<a name="l00371"></a>00371                 <span class="keywordflow">return</span> GL_RGBA;
<a name="l00372"></a>00372             }
<a name="l00373"></a>00373             <span class="keywordflow">else</span> {
<a name="l00374"></a>00374                 <span class="keywordflow">return</span> __allegro_gl_texture_components[1];
<a name="l00375"></a>00375             }
<a name="l00376"></a>00376 
<a name="l00377"></a>00377         <span class="keywordflow">case</span> 16:
<a name="l00378"></a>00378             <span class="keywordflow">return</span> __allegro_gl_texture_components[2];
<a name="l00379"></a>00379 
<a name="l00380"></a>00380         <span class="keywordflow">case</span> 24:
<a name="l00381"></a>00381             <span class="keywordflow">return</span> __allegro_gl_texture_components[3];
<a name="l00382"></a>00382 
<a name="l00383"></a>00383         <span class="keywordflow">case</span> 32:
<a name="l00384"></a>00384             <span class="keywordflow">if</span> (flags &amp; (<a class="code" href="group__texture.html#ga8cc859eadf1610b424cd9188e716f432" title="Tell AllegroGL that the bitmap had an alpha channel, so it should be preserved when generating the te...">AGL_TEXTURE_HAS_ALPHA</a>
<a name="l00385"></a>00385                        | AGL_TEXTURE_FORCE_ALPHA_INTERNAL)) {
<a name="l00386"></a>00386                 <span class="keywordflow">return</span> GL_RGBA;
<a name="l00387"></a>00387             }
<a name="l00388"></a>00388             <span class="keywordflow">else</span> {
<a name="l00389"></a>00389                 <span class="keywordflow">return</span> __allegro_gl_texture_components[4];
<a name="l00390"></a>00390             }
<a name="l00391"></a>00391     
<a name="l00392"></a>00392         <span class="keywordflow">default</span>:
<a name="l00393"></a>00393             TRACE(PREFIX_E <span class="stringliteral">&quot;get_bitmap_color_format: unhandled bitmap &quot;</span>
<a name="l00394"></a>00394                   <span class="stringliteral">&quot;depth: %d\n&quot;</span>, c);
<a name="l00395"></a>00395             <span class="keywordflow">return</span> -1;
<a name="l00396"></a>00396     }
<a name="l00397"></a>00397 }
<a name="l00398"></a>00398 
<a name="l00399"></a>00399 
<a name="l00400"></a>00400 
<a name="l00401"></a>00401 <span class="comment">/* int allegro_gl_use_mipmapping(int enable) */</span>
<a name="l00415"></a><a class="code" href="group__texture.html#gab5393ecc10a2a31da7eb80c889af89ac">00415</a> <span class="keywordtype">int</span> <a class="code" href="group__texture.html#gab5393ecc10a2a31da7eb80c889af89ac" title="Tell AllegroGL to use Mipmapping or not when generating textures via its functions.">allegro_gl_use_mipmapping</a>(<span class="keywordtype">int</span> enable) {
<a name="l00416"></a>00416 
<a name="l00417"></a>00417     <span class="keywordtype">int</span> old = allegro_gl_use_mipmapping_for_textures;
<a name="l00418"></a>00418     allegro_gl_use_mipmapping_for_textures = enable;
<a name="l00419"></a>00419     <span class="keywordflow">return</span> old;
<a name="l00420"></a>00420 }
<a name="l00421"></a>00421     
<a name="l00422"></a>00422 
<a name="l00423"></a>00423 
<a name="l00424"></a>00424 <span class="comment">/* int allegro_gl_use_alpha_channel(int enable) */</span>
<a name="l00439"></a><a class="code" href="group__texture.html#ga1d88f4ebc7ed1ecd65640b72ea46a71e">00439</a> <span class="keywordtype">int</span> <a class="code" href="group__texture.html#ga1d88f4ebc7ed1ecd65640b72ea46a71e" title="Tell AllegroGL to use Alpha channel or not when generating textures via its functions.">allegro_gl_use_alpha_channel</a>(<span class="keywordtype">int</span> enable) {
<a name="l00440"></a>00440 
<a name="l00441"></a>00441     <span class="keywordtype">int</span> old = __allegro_gl_use_alpha;
<a name="l00442"></a>00442     __allegro_gl_use_alpha = enable;
<a name="l00443"></a>00443     <span class="keywordflow">return</span> old;
<a name="l00444"></a>00444 }
<a name="l00445"></a>00445     
<a name="l00446"></a>00446 
<a name="l00447"></a>00447 
<a name="l00448"></a>00448 <span class="comment">/* int allegro_gl_flip_texture(int enable) */</span>
<a name="l00464"></a><a class="code" href="group__texture.html#ga3ec0a1c4c6656f13c8398bab7a1293f2">00464</a> <span class="keywordtype">int</span> <a class="code" href="group__texture.html#ga3ec0a1c4c6656f13c8398bab7a1293f2" title="Tell AllegroGL to flip the texture vertically or not when generating textures via its functions...">allegro_gl_flip_texture</a>(<span class="keywordtype">int</span> enable) {
<a name="l00465"></a>00465 
<a name="l00466"></a>00466     <span class="keywordtype">int</span> old = __allegro_gl_flip_texture;
<a name="l00467"></a>00467     __allegro_gl_flip_texture = enable;
<a name="l00468"></a>00468     <span class="keywordflow">return</span> old;
<a name="l00469"></a>00469 }
<a name="l00470"></a>00470     
<a name="l00471"></a>00471 
<a name="l00472"></a>00472 
<a name="l00473"></a>00473 <span class="comment">/* int allegro_gl_check_texture_ex(int flags, BITMAP *bmp, GLuint internal_format) */</span>
<a name="l00495"></a><a class="code" href="group__texture.html#gab0cf4dc0ddcb45f5b067d08aed1c88e6">00495</a> <span class="keywordtype">int</span> <a class="code" href="group__texture.html#gab0cf4dc0ddcb45f5b067d08aed1c88e6" title="Checks whether the specified bitmap is of the proper size for texturing.">allegro_gl_check_texture_ex</a>(<span class="keywordtype">int</span> flags, BITMAP *bmp,
<a name="l00496"></a>00496                                    GLint internal_format) {
<a name="l00497"></a>00497 
<a name="l00498"></a>00498     <span class="keywordflow">return</span> (<a class="code" href="group__texture.html#gaf3a48c555068e7051171255c1011150a" title="Uploads an Allegro BITMAP to the GL driver as a texture.">allegro_gl_make_texture_ex</a>(flags | AGL_TEXTURE_CHECK_VALID_INTERNAL,
<a name="l00499"></a>00499                                        bmp, internal_format) ? TRUE : FALSE);
<a name="l00500"></a>00500 }
<a name="l00501"></a>00501 
<a name="l00502"></a>00502 
<a name="l00503"></a>00503 
<a name="l00504"></a>00504 <span class="comment">/* Convert flags from pre-0.2.0 to 0.2.0+ */</span>
<a name="l00505"></a>00505 <span class="keyword">static</span> <span class="keywordtype">int</span> __allegro_gl_convert_flags(<span class="keywordtype">int</span> flags) {
<a name="l00506"></a>00506 
<a name="l00507"></a>00507     flags |= <a class="code" href="group__texture.html#gaa8b7246edc7ec019ec3b434eb0cacdf2" title="Tell AllegroGL to allow rescaling of the bitmap.">AGL_TEXTURE_RESCALE</a>;
<a name="l00508"></a>00508 
<a name="l00509"></a>00509     <span class="keywordflow">if</span> (allegro_gl_use_mipmapping_for_textures) {
<a name="l00510"></a>00510         flags |= <a class="code" href="group__texture.html#gabaf179e577a9328a751e92e3603f0746" title="AllegroGL will generate mipmaps for this texture.">AGL_TEXTURE_MIPMAP</a>;
<a name="l00511"></a>00511     }
<a name="l00512"></a>00512     <span class="keywordflow">if</span> (__allegro_gl_use_alpha) {
<a name="l00513"></a>00513         flags |= <a class="code" href="group__texture.html#ga8cc859eadf1610b424cd9188e716f432" title="Tell AllegroGL that the bitmap had an alpha channel, so it should be preserved when generating the te...">AGL_TEXTURE_HAS_ALPHA</a>;
<a name="l00514"></a>00514     }
<a name="l00515"></a>00515     <span class="keywordflow">if</span> (__allegro_gl_flip_texture) {
<a name="l00516"></a>00516         flags |= <a class="code" href="group__texture.html#gadeffe4feb290278035beacedb284a010" title="Flip the texture on the x-axis.">AGL_TEXTURE_FLIP</a>;
<a name="l00517"></a>00517     }
<a name="l00518"></a>00518 
<a name="l00519"></a>00519     <span class="keywordflow">if</span> (allegro_gl_opengl_internal_texture_format == GL_ALPHA4
<a name="l00520"></a>00520      || allegro_gl_opengl_internal_texture_format == GL_ALPHA8
<a name="l00521"></a>00521      || allegro_gl_opengl_internal_texture_format == GL_ALPHA12
<a name="l00522"></a>00522      || allegro_gl_opengl_internal_texture_format == GL_ALPHA16
<a name="l00523"></a>00523      || allegro_gl_opengl_internal_texture_format == GL_ALPHA
<a name="l00524"></a>00524      || allegro_gl_opengl_internal_texture_format == GL_INTENSITY4
<a name="l00525"></a>00525      || allegro_gl_opengl_internal_texture_format == GL_INTENSITY8
<a name="l00526"></a>00526      || allegro_gl_opengl_internal_texture_format == GL_INTENSITY12
<a name="l00527"></a>00527      || allegro_gl_opengl_internal_texture_format == GL_INTENSITY16
<a name="l00528"></a>00528      || allegro_gl_opengl_internal_texture_format == GL_INTENSITY
<a name="l00529"></a>00529      || allegro_gl_opengl_internal_texture_format == 1) {
<a name="l00530"></a>00530         flags |= <a class="code" href="group__texture.html#gad67cfdfd21ef2cae75b03cb871e57f4a" title="Tell AllegroGL that the specified BITMAP is an 8-bpp alpha-only BITMAP.">AGL_TEXTURE_ALPHA_ONLY</a>;
<a name="l00531"></a>00531     }
<a name="l00532"></a>00532 
<a name="l00533"></a>00533     <span class="keywordflow">return</span> flags;
<a name="l00534"></a>00534 }
<a name="l00535"></a>00535 
<a name="l00536"></a>00536 
<a name="l00537"></a>00537 
<a name="l00538"></a>00538 <span class="comment">/* int allegro_gl_check_texture(BITMAP *bmp) */</span>
<a name="l00557"></a><a class="code" href="group__texture.html#ga6996c14538e18b1614f91d34b2d4d691">00557</a> <span class="keywordtype">int</span> <a class="code" href="group__texture.html#ga6996c14538e18b1614f91d34b2d4d691" title="Checks whether the specified bitmap is of the proper size for texturing.">allegro_gl_check_texture</a>(BITMAP *bmp) {
<a name="l00558"></a>00558 
<a name="l00559"></a>00559     <span class="keywordtype">int</span> flags = __allegro_gl_convert_flags(0);
<a name="l00560"></a>00560     
<a name="l00561"></a>00561     <span class="keywordflow">return</span> <a class="code" href="group__texture.html#gab0cf4dc0ddcb45f5b067d08aed1c88e6" title="Checks whether the specified bitmap is of the proper size for texturing.">allegro_gl_check_texture_ex</a>(flags, bmp,
<a name="l00562"></a>00562                                      allegro_gl_opengl_internal_texture_format);
<a name="l00563"></a>00563 }
<a name="l00564"></a>00564 
<a name="l00565"></a>00565 
<a name="l00566"></a>00566 
<a name="l00567"></a>00567 <span class="comment">/* Integer log2 function. Not optimized for speed. */</span>
<a name="l00568"></a>00568 <span class="keyword">static</span> <span class="keywordtype">int</span> log2i(<span class="keywordtype">int</span> n) {
<a name="l00569"></a>00569     
<a name="l00570"></a>00570     <span class="keywordtype">int</span> k;
<a name="l00571"></a>00571     
<a name="l00572"></a>00572     <span class="keywordflow">if</span> (n &lt; 1) {
<a name="l00573"></a>00573         <span class="keywordflow">return</span> -1;
<a name="l00574"></a>00574     }
<a name="l00575"></a>00575 
<a name="l00576"></a>00576     k = 0;
<a name="l00577"></a>00577     <span class="keywordflow">while</span> (n &gt;&gt;= 1) {
<a name="l00578"></a>00578         k++;
<a name="l00579"></a>00579     }
<a name="l00580"></a>00580 
<a name="l00581"></a>00581     <span class="keywordflow">return</span> k;
<a name="l00582"></a>00582 }
<a name="l00583"></a>00583 
<a name="l00584"></a>00584 
<a name="l00585"></a>00585 
<a name="l00586"></a>00586 <span class="comment">/* BITMAP *__allegro_gl_munge_bitmap(int flags, BITMAP *bmp, GLint *type, GLint *format) */</span>
<a name="l00596"></a>00596 BITMAP *__allegro_gl_munge_bitmap(<span class="keywordtype">int</span> flags, BITMAP *bmp, <span class="keywordtype">int</span> x, <span class="keywordtype">int</span> y,
<a name="l00597"></a>00597                                   <span class="keywordtype">int</span> w, <span class="keywordtype">int</span> h, GLint *type, GLint *format) {
<a name="l00598"></a>00598     
<a name="l00599"></a>00599     BITMAP *ret = 0, *temp = 0;
<a name="l00600"></a>00600 
<a name="l00601"></a>00601     <span class="keywordtype">int</span> need_rescale = 0;
<a name="l00602"></a>00602     <span class="keywordtype">int</span> need_alpha   = 0;
<a name="l00603"></a>00603     <span class="keywordtype">int</span> need_flip    = 0;
<a name="l00604"></a>00604     <span class="keywordtype">int</span> depth = bitmap_color_depth(bmp);
<a name="l00605"></a>00605     <span class="keywordtype">int</span> force_copy   = 0;
<a name="l00606"></a>00606 
<a name="l00607"></a>00607     <span class="keyword">const</span> <span class="keywordtype">int</span> old_w = w, old_h = h;
<a name="l00608"></a>00608 
<a name="l00609"></a>00609     <span class="keywordflow">if</span> (flags &amp; <a class="code" href="group__texture.html#gaa8b7246edc7ec019ec3b434eb0cacdf2" title="Tell AllegroGL to allow rescaling of the bitmap.">AGL_TEXTURE_RESCALE</a>) {
<a name="l00610"></a>00610         
<a name="l00611"></a>00611         <span class="comment">/* Check if rescaling is needed */</span>
<a name="l00612"></a>00612 
<a name="l00613"></a>00613         <span class="comment">/* NP2 is not supported, and the texture isn&#39;t a power-of-two.</span>
<a name="l00614"></a>00614 <span class="comment">         * Resize the next power of 2</span>
<a name="l00615"></a>00615 <span class="comment">         */</span>     
<a name="l00616"></a>00616         <span class="keywordflow">if</span> (!<a class="code" href="group__extensions.html#ga7492f6f6acc608789210560ee63e5436" title="List of OpenGL extensions supported by AllegroGL.">allegro_gl_extensions_GL</a>.ARB_texture_non_power_of_two
<a name="l00617"></a>00617          &amp;&amp; ((w &amp; (w - 1)) || (h &amp; (h - 1)))) {
<a name="l00618"></a>00618             w = __allegro_gl_make_power_of_2(w);
<a name="l00619"></a>00619             h = __allegro_gl_make_power_of_2(h);
<a name="l00620"></a>00620             TRACE(PREFIX_I <span class="stringliteral">&quot;munge_bitmap: Rescaling bitmap from &quot;</span>
<a name="l00621"></a>00621                   <span class="stringliteral">&quot;%ix%i to %ix%i due to non-power-of-2 source size.\n&quot;</span>,
<a name="l00622"></a>00622                   old_w, old_h, w, h);
<a name="l00623"></a>00623             need_rescale = 1;
<a name="l00624"></a>00624         }
<a name="l00625"></a>00625 
<a name="l00626"></a>00626         <span class="comment">/* Don&#39;t go over the max texture size */</span>
<a name="l00627"></a>00627         <span class="keywordflow">if</span> (w &gt; allegro_gl_info.max_texture_size) {
<a name="l00628"></a>00628             w = allegro_gl_info.max_texture_size;
<a name="l00629"></a>00629             TRACE(PREFIX_I <span class="stringliteral">&quot;munge_bitmap: Rescaling bitmap from &quot;</span>
<a name="l00630"></a>00630                   <span class="stringliteral">&quot;%ix%i to %ix%i due to max supported size exceed.\n&quot;</span>,
<a name="l00631"></a>00631                   old_w, old_h, w, h);
<a name="l00632"></a>00632             need_rescale = 1;
<a name="l00633"></a>00633         }
<a name="l00634"></a>00634         
<a name="l00635"></a>00635         <span class="keywordflow">if</span> (h &gt; allegro_gl_info.max_texture_size) {
<a name="l00636"></a>00636             h = allegro_gl_info.max_texture_size;
<a name="l00637"></a>00637             TRACE(PREFIX_I <span class="stringliteral">&quot;munge_bitmap: Rescaling bitmap from &quot;</span>
<a name="l00638"></a>00638                   <span class="stringliteral">&quot;%ix%i to %ix%i due to max supported size exceed.\n&quot;</span>,
<a name="l00639"></a>00639                   old_w, old_h, w, h);
<a name="l00640"></a>00640             need_rescale = 1;
<a name="l00641"></a>00641         }
<a name="l00642"></a>00642 
<a name="l00643"></a>00643         <span class="comment">/* Voodoos don&#39;t support mipmaps for textures greater than 32x32.</span>
<a name="l00644"></a>00644 <span class="comment">         * If we&#39;re allowed to rescale, rescale the bitmap to 32x32.</span>
<a name="l00645"></a>00645 <span class="comment">         * XXX &lt;rohannessian&gt; Apparently, this is a bug in one version</span>
<a name="l00646"></a>00646 <span class="comment">         * of the Voodoo GL driver. Need to figure out a workaround</span>
<a name="l00647"></a>00647 <span class="comment">         * for that.</span>
<a name="l00648"></a>00648 <span class="comment">         */</span>
<a name="l00649"></a>00649         <span class="keywordflow">if</span> (allegro_gl_info.is_voodoo &amp;&amp; (flags &amp; <a class="code" href="group__texture.html#gabaf179e577a9328a751e92e3603f0746" title="AllegroGL will generate mipmaps for this texture.">AGL_TEXTURE_MIPMAP</a>)
<a name="l00650"></a>00650           &amp;&amp; (w &gt; 32 || h &gt; 32)) {
<a name="l00651"></a>00651 
<a name="l00652"></a>00652             w = MIN(32, w);
<a name="l00653"></a>00653             h = MIN(32, h);
<a name="l00654"></a>00654             
<a name="l00655"></a>00655             TRACE(PREFIX_I <span class="stringliteral">&quot;munge_bitmap: Rescaling bitmap from &quot;</span>
<a name="l00656"></a>00656                   <span class="stringliteral">&quot;%ix%i to %ix%i due to Voodoo driver bug.\n&quot;</span>,
<a name="l00657"></a>00657                   old_w, old_h, w, h);
<a name="l00658"></a>00658             need_rescale = 1;
<a name="l00659"></a>00659         }
<a name="l00660"></a>00660     }
<a name="l00661"></a>00661 
<a name="l00662"></a>00662     <span class="comment">/* Matrox G200 cards have a bug where rectangular textures can&#39;t have</span>
<a name="l00663"></a>00663 <span class="comment">     * more than 4 levels of mipmaps (max_mip == 3). This doesn&#39;t seem</span>
<a name="l00664"></a>00664 <span class="comment">     * to affect square textures.</span>
<a name="l00665"></a>00665 <span class="comment">     *</span>
<a name="l00666"></a>00666 <span class="comment">     * Note: Using GLU to build the mipmaps seems to work. Maybe AGL is</span>
<a name="l00667"></a>00667 <span class="comment">     * doing something wrong?</span>
<a name="l00668"></a>00668 <span class="comment">     *</span>
<a name="l00669"></a>00669 <span class="comment">     * Workaround: Use GLU to build the mipmaps, and force depth to 24 or</span>
<a name="l00670"></a>00670 <span class="comment">     * 32.</span>
<a name="l00671"></a>00671 <span class="comment">     */</span>
<a name="l00672"></a>00672     <span class="keywordflow">if</span> ( allegro_gl_info.is_matrox_g200 &amp;&amp; (flags &amp; <a class="code" href="group__texture.html#gabaf179e577a9328a751e92e3603f0746" title="AllegroGL will generate mipmaps for this texture.">AGL_TEXTURE_MIPMAP</a>)) {
<a name="l00673"></a>00673         <span class="keywordtype">int</span> wl = log2i(w);
<a name="l00674"></a>00674         <span class="keywordtype">int</span> hl = log2i(h);
<a name="l00675"></a>00675 
<a name="l00676"></a>00676         <span class="keywordflow">if</span> (w != h &amp;&amp; MAX(wl, hl) &gt; 3 &amp;&amp; depth &lt; 24
<a name="l00677"></a>00677          &amp;&amp; !(flags &amp; AGL_TEXTURE_ALPHA_ONLY)) {
<a name="l00678"></a>00678             TRACE(PREFIX_I <span class="stringliteral">&quot;munge_bitmap: G200 path in use.\n&quot;</span>);
<a name="l00679"></a>00679             depth = 24;
<a name="l00680"></a>00680         }
<a name="l00681"></a>00681     }
<a name="l00682"></a>00682     
<a name="l00683"></a>00683     <span class="comment">/* Do we need to flip the texture on the t axis? */</span>
<a name="l00684"></a>00684     <span class="keywordflow">if</span> (flags &amp; <a class="code" href="group__texture.html#gadeffe4feb290278035beacedb284a010" title="Flip the texture on the x-axis.">AGL_TEXTURE_FLIP</a>) {
<a name="l00685"></a>00685         need_flip = 1;
<a name="l00686"></a>00686     }
<a name="l00687"></a>00687 
<a name="l00688"></a>00688 
<a name="l00689"></a>00689     <span class="comment">/* If not supported, blit to a 24 bpp bitmap and try again</span>
<a name="l00690"></a>00690 <span class="comment">     */</span>
<a name="l00691"></a>00691     <span class="keywordflow">if</span> (*type == -1) {
<a name="l00692"></a>00692         TRACE(PREFIX_W <span class="stringliteral">&quot;munge_bitmap: using temporary 24bpp bitmap\n&quot;</span>);
<a name="l00693"></a>00693         depth = 24;
<a name="l00694"></a>00694     }
<a name="l00695"></a>00695 
<a name="l00696"></a>00696     <span class="comment">/* We need a texture that can be used for masked blits.</span>
<a name="l00697"></a>00697 <span class="comment">     * Insert an alpha channel if one is not there.</span>
<a name="l00698"></a>00698 <span class="comment">     * If it&#39;s already there, replace it by 0/1 as needed.</span>
<a name="l00699"></a>00699 <span class="comment">     */</span>
<a name="l00700"></a>00700     <span class="keywordflow">if</span> ((flags &amp; <a class="code" href="group__texture.html#gaba184d573c65f33b35d1d57936607d08" title="Generate an alpha channel for this texture, based on the Allegro mask color.">AGL_TEXTURE_MASKED</a>) &amp;&amp; !(flags &amp; AGL_TEXTURE_ALPHA_ONLY)) {
<a name="l00701"></a>00701         need_alpha = 1;
<a name="l00702"></a>00702 
<a name="l00703"></a>00703         <span class="keywordflow">switch</span> (depth) {
<a name="l00704"></a>00704         <span class="keywordflow">case</span> 15:
<a name="l00705"></a>00705             <span class="keywordflow">if</span> (!<a class="code" href="group__extensions.html#ga7492f6f6acc608789210560ee63e5436" title="List of OpenGL extensions supported by AllegroGL.">allegro_gl_extensions_GL</a>.EXT_packed_pixels) {
<a name="l00706"></a>00706                 depth = 32;
<a name="l00707"></a>00707             }
<a name="l00708"></a>00708             <span class="keywordflow">break</span>;
<a name="l00709"></a>00709         <span class="keywordflow">case</span> 8:
<a name="l00710"></a>00710         <span class="keywordflow">case</span> 16:
<a name="l00711"></a>00711         <span class="keywordflow">case</span> 24:
<a name="l00712"></a>00712         <span class="keywordflow">case</span> 32:
<a name="l00713"></a>00713             depth = 32;
<a name="l00714"></a>00714             <span class="keywordflow">break</span>;
<a name="l00715"></a>00715         }
<a name="l00716"></a>00716         force_copy = 1;
<a name="l00717"></a>00717     }
<a name="l00718"></a>00718 
<a name="l00719"></a>00719     <span class="comment">/* Allegro fills in 0 for the alpha channel. Matrox G200 seems to ignore</span>
<a name="l00720"></a>00720 <span class="comment">     * the internal format; so we need to drop down to 24-bpp if no alpha</span>
<a name="l00721"></a>00721 <span class="comment">     * will be needed.</span>
<a name="l00722"></a>00722 <span class="comment">     */</span>
<a name="l00723"></a>00723     <span class="keywordflow">if</span> (allegro_gl_info.is_matrox_g200 &amp;&amp; !(flags &amp; AGL_TEXTURE_MASKED)
<a name="l00724"></a>00724        &amp;&amp; !(flags &amp; <a class="code" href="group__texture.html#ga8cc859eadf1610b424cd9188e716f432" title="Tell AllegroGL that the bitmap had an alpha channel, so it should be preserved when generating the te...">AGL_TEXTURE_HAS_ALPHA</a>) &amp;&amp; depth == 32) {
<a name="l00725"></a>00725         TRACE(PREFIX_I <span class="stringliteral">&quot;munge_bitmap: G200 path in use.\n&quot;</span>);
<a name="l00726"></a>00726         depth = 24;
<a name="l00727"></a>00727         force_copy = 1;
<a name="l00728"></a>00728     }
<a name="l00729"></a>00729 
<a name="l00730"></a>00730     
<a name="l00731"></a>00731     <span class="comment">/* Do we need to do a color depth conversion or bitmap copy? */</span>
<a name="l00732"></a>00732     <span class="keywordflow">if</span> (depth != bitmap_color_depth(bmp) || force_copy) {
<a name="l00733"></a>00733 
<a name="l00734"></a>00734         TRACE(PREFIX_I <span class="stringliteral">&quot;munge_bitmap: Need to perform depth conversion from %i &quot;</span>
<a name="l00735"></a>00735               <span class="stringliteral">&quot;to %i bpp.\n&quot;</span>, bitmap_color_depth(bmp), depth);
<a name="l00736"></a>00736 
<a name="l00737"></a>00737         temp = create_bitmap_ex(depth, bmp-&gt;w, bmp-&gt;h);
<a name="l00738"></a>00738 
<a name="l00739"></a>00739         <span class="keywordflow">if</span> (!temp) {
<a name="l00740"></a>00740             TRACE(PREFIX_E <span class="stringliteral">&quot;munge_bitmap: Unable to create temporary bitmap &quot;</span>
<a name="l00741"></a>00741                   <span class="stringliteral">&quot;%ix%ix%i\n&quot;</span>, bmp-&gt;w, bmp-&gt;h, depth);
<a name="l00742"></a>00742             <span class="keywordflow">return</span> NULL;
<a name="l00743"></a>00743         }
<a name="l00744"></a>00744 
<a name="l00745"></a>00745         <span class="comment">/* XXX &lt;rohannessian&gt; Use palette conversion?</span>
<a name="l00746"></a>00746 <span class="comment">         */</span>
<a name="l00747"></a>00747         <span class="keywordflow">if</span> (bitmap_color_depth(bmp) == 8 &amp;&amp; depth &gt; 8) {
<a name="l00748"></a>00748             <span class="keywordtype">int</span> i, j;
<a name="l00749"></a>00749             <span class="keywordflow">for</span> (j = 0; j &lt; bmp-&gt;h; j++) {
<a name="l00750"></a>00750                 <span class="keywordflow">for</span> (i = 0; i &lt; bmp-&gt;w; i++) {
<a name="l00751"></a>00751                     <span class="keywordtype">int</span> c = _getpixel(bmp, i, j);
<a name="l00752"></a>00752                     putpixel(temp, i, j, makecol_depth(depth, c, c, c));
<a name="l00753"></a>00753                 }
<a name="l00754"></a>00754             }
<a name="l00755"></a>00755         }
<a name="l00756"></a>00756         <span class="keywordflow">else</span> {
<a name="l00757"></a>00757             blit(bmp, temp, 0, 0, 0, 0, bmp-&gt;w, bmp-&gt;h);
<a name="l00758"></a>00758         }
<a name="l00759"></a>00759         bmp = temp;
<a name="l00760"></a>00760 
<a name="l00761"></a>00761         *format = __allegro_gl_get_bitmap_color_format(bmp, flags);
<a name="l00762"></a>00762         *type = __allegro_gl_get_bitmap_type(bmp, flags);
<a name="l00763"></a>00763     }
<a name="l00764"></a>00764 
<a name="l00765"></a>00765 
<a name="l00766"></a>00766 
<a name="l00767"></a>00767     <span class="comment">/* Nothing to do? */</span>
<a name="l00768"></a>00768     <span class="keywordflow">if</span> (!need_rescale &amp;&amp; !need_alpha &amp;&amp; !need_flip) {
<a name="l00769"></a>00769 
<a name="l00770"></a>00770         TRACE(PREFIX_I <span class="stringliteral">&quot;munge_bitmap: No need for munging - returning %p\n&quot;</span>,
<a name="l00771"></a>00771               temp);
<a name="l00772"></a>00772         
<a name="l00773"></a>00773         <span class="comment">/* Return depth-converte bitmap, if present */</span>
<a name="l00774"></a>00774         <span class="keywordflow">if</span> (temp) {
<a name="l00775"></a>00775             <span class="keywordflow">return</span> temp;
<a name="l00776"></a>00776         }
<a name="l00777"></a>00777         <span class="keywordflow">return</span> NULL;
<a name="l00778"></a>00778     }
<a name="l00779"></a>00779 
<a name="l00780"></a>00780     ret = create_bitmap_ex(depth, w, h);
<a name="l00781"></a>00781     
<a name="l00782"></a>00782     <span class="keywordflow">if</span> (!ret) {
<a name="l00783"></a>00783         TRACE(PREFIX_E <span class="stringliteral">&quot;munge_bitmap: Unable to create result bitmap &quot;</span>
<a name="l00784"></a>00784               <span class="stringliteral">&quot;%ix%ix%i\n&quot;</span>, w, h, depth);
<a name="l00785"></a>00785         <span class="keywordflow">goto</span> error;
<a name="l00786"></a>00786     }
<a name="l00787"></a>00787 
<a name="l00788"></a>00788 
<a name="l00789"></a>00789     <span class="comment">/* No need to fill in bitmap if we&#39;re just making a query */</span>
<a name="l00790"></a>00790     <span class="keywordflow">if</span> (flags &amp; AGL_TEXTURE_CHECK_VALID_INTERNAL) {
<a name="l00791"></a>00791         <span class="keywordflow">if</span> (temp) {
<a name="l00792"></a>00792             destroy_bitmap(temp);
<a name="l00793"></a>00793         }
<a name="l00794"></a>00794         <span class="keywordflow">return</span> ret;
<a name="l00795"></a>00795     }
<a name="l00796"></a>00796 
<a name="l00797"></a>00797 
<a name="l00798"></a>00798     <span class="comment">/* Perform flip</span>
<a name="l00799"></a>00799 <span class="comment">     * I don&#39;t want to have to deal with *yet another* temporary bitmap</span>
<a name="l00800"></a>00800 <span class="comment">     * so instead, I fugde the line pointers around.</span>
<a name="l00801"></a>00801 <span class="comment">     * This will work because we require Allegro memory bitmaps anyway.</span>
<a name="l00802"></a>00802 <span class="comment">     */</span>
<a name="l00803"></a>00803     <span class="keywordflow">if</span> (need_flip) {
<a name="l00804"></a>00804         <span class="keywordtype">int</span> i;
<a name="l00805"></a>00805         TRACE(PREFIX_I <span class="stringliteral">&quot;munge_bitmap: Flipping bitmap.\n&quot;</span>);
<a name="l00806"></a>00806         <span class="keywordflow">for</span> (i = 0; i &lt; bmp-&gt;h/2; i++) {
<a name="l00807"></a>00807             <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *l = bmp-&gt;line[i];
<a name="l00808"></a>00808             bmp-&gt;line[i] = bmp-&gt;line[bmp-&gt;h - i - 1];
<a name="l00809"></a>00809             bmp-&gt;line[bmp-&gt;h - i - 1] = l;
<a name="l00810"></a>00810         }
<a name="l00811"></a>00811     }
<a name="l00812"></a>00812     
<a name="l00813"></a>00813     <span class="comment">/* Rescale bitmap */</span>
<a name="l00814"></a>00814     <span class="keywordflow">if</span> (need_rescale) {
<a name="l00815"></a>00815         TRACE(PREFIX_I <span class="stringliteral">&quot;munge_bitmap: Rescaling bitmap.\n&quot;</span>);
<a name="l00816"></a>00816         stretch_blit(bmp, ret, x, y, old_w, old_h, 0, 0, ret-&gt;w, ret-&gt;h);
<a name="l00817"></a>00817     }
<a name="l00818"></a>00818     <span class="keywordflow">else</span> {
<a name="l00819"></a>00819         TRACE(PREFIX_I <span class="stringliteral">&quot;munge_bitmap: Copying bitmap.\n&quot;</span>);
<a name="l00820"></a>00820         blit(bmp, ret, x, y, 0, 0, w, h);
<a name="l00821"></a>00821     }
<a name="l00822"></a>00822 
<a name="l00823"></a>00823     <span class="comment">/* Restore the original bitmap, if needed */</span>
<a name="l00824"></a>00824     <span class="keywordflow">if</span> (need_flip &amp;&amp; !temp) {
<a name="l00825"></a>00825         <span class="keywordtype">int</span> i;
<a name="l00826"></a>00826         TRACE(PREFIX_I <span class="stringliteral">&quot;munge_bitmap: Unflipping bitmap.\n&quot;</span>);
<a name="l00827"></a>00827         <span class="keywordflow">for</span> (i = 0; i &lt; bmp-&gt;h/2; i++) {
<a name="l00828"></a>00828             <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *l = bmp-&gt;line[i];
<a name="l00829"></a>00829             bmp-&gt;line[i] = bmp-&gt;line[bmp-&gt;h - i - 1];
<a name="l00830"></a>00830             bmp-&gt;line[bmp-&gt;h - i - 1] = l;
<a name="l00831"></a>00831         }
<a name="l00832"></a>00832     }
<a name="l00833"></a>00833     
<a name="l00834"></a>00834     <span class="comment">/* Insert alpha channel */</span>
<a name="l00835"></a>00835     <span class="keywordflow">if</span> (need_alpha) {
<a name="l00836"></a>00836         <span class="keywordtype">int</span> i, j;
<a name="l00837"></a>00837         <span class="keywordtype">int</span> mask = bitmap_mask_color(ret);
<a name="l00838"></a>00838 
<a name="l00839"></a>00839         <span class="comment">/* alpha mask for 5.5.5.1 pixels */</span>
<a name="l00840"></a>00840         <span class="keywordtype">int</span> alpha = (-1) ^ makecol_depth(depth, 255, 255, 255);
<a name="l00841"></a>00841 
<a name="l00842"></a>00842         TRACE(PREFIX_I <span class="stringliteral">&quot;munge_bitmap: Inserting alpha channel.\n&quot;</span>);
<a name="l00843"></a>00843 
<a name="l00844"></a>00844         <span class="keywordflow">for</span> (j = 0; j &lt; h; j++) {
<a name="l00845"></a>00845             <span class="keywordflow">for</span> (i = 0; i &lt; w; i++) {
<a name="l00846"></a>00846                 <span class="keywordtype">int</span> pix;
<a name="l00847"></a>00847                 
<a name="l00848"></a>00848                 <span class="keywordflow">switch</span> (depth) {
<a name="l00849"></a>00849                 <span class="keywordflow">case</span> 32:
<a name="l00850"></a>00850                     pix = _getpixel32(ret, i, j);
<a name="l00851"></a>00851 
<a name="l00852"></a>00852                     <span class="keywordflow">if</span> (pix == mask) {
<a name="l00853"></a>00853                         pix = 0;
<a name="l00854"></a>00854                     }
<a name="l00855"></a>00855                     <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((flags &amp; AGL_TEXTURE_HAS_ALPHA) == 0) {
<a name="l00856"></a>00856                         <span class="keywordtype">int</span> r, g, b;
<a name="l00857"></a>00857                         r = getr32(pix);
<a name="l00858"></a>00858                         g = getg32(pix);
<a name="l00859"></a>00859                         b = getb32(pix);
<a name="l00860"></a>00860                         pix = makeacol32(r, g, b, 255);
<a name="l00861"></a>00861                     }
<a name="l00862"></a>00862                     _putpixel32(ret, i, j, pix);
<a name="l00863"></a>00863                     <span class="keywordflow">break</span>;
<a name="l00864"></a>00864                 <span class="keywordflow">case</span> 15: 
<a name="l00865"></a>00865                     pix = _getpixel16(ret, i, j);
<a name="l00866"></a>00866 
<a name="l00867"></a>00867                     <span class="keywordflow">if</span> (pix == mask) {
<a name="l00868"></a>00868                         pix = 0;
<a name="l00869"></a>00869                     }
<a name="l00870"></a>00870                     <span class="keywordflow">else</span> {
<a name="l00871"></a>00871                         pix |= alpha;
<a name="l00872"></a>00872                     }
<a name="l00873"></a>00873                     
<a name="l00874"></a>00874                     _putpixel16(temp, i, j, pix);
<a name="l00875"></a>00875                     <span class="keywordflow">break</span>;
<a name="l00876"></a>00876                 <span class="keywordflow">default</span>:
<a name="l00877"></a>00877                     <span class="comment">/* Shouldn&#39;t actually come here */</span>
<a name="l00878"></a>00878                     ASSERT(0);
<a name="l00879"></a>00879                 }
<a name="l00880"></a>00880             }
<a name="l00881"></a>00881         }
<a name="l00882"></a>00882     }
<a name="l00883"></a>00883 
<a name="l00884"></a>00884 
<a name="l00885"></a>00885 error:
<a name="l00886"></a>00886     <span class="keywordflow">if</span> (temp) {
<a name="l00887"></a>00887         destroy_bitmap(temp);
<a name="l00888"></a>00888     }
<a name="l00889"></a>00889 
<a name="l00890"></a>00890     <span class="keywordflow">return</span> ret;
<a name="l00891"></a>00891 }
<a name="l00892"></a>00892 
<a name="l00893"></a>00893 
<a name="l00894"></a>00894 
<a name="l00895"></a>00895 <span class="comment">/* Perform the actual texture upload. Helper for agl_make_texture_ex().</span>
<a name="l00896"></a>00896 <span class="comment"> */</span>
<a name="l00897"></a>00897 <span class="keyword">static</span> GLuint do_texture_upload(BITMAP *bmp, GLuint tex, GLint internal_format,
<a name="l00898"></a>00898                               GLint format, GLint type, <span class="keywordtype">int</span> flags) {
<a name="l00899"></a>00899 
<a name="l00900"></a>00900     <span class="keywordtype">int</span> bytes_per_pixel = BYTES_PER_PIXEL(bitmap_color_depth(bmp));
<a name="l00901"></a>00901     GLint saved_row_length;
<a name="l00902"></a>00902     GLint saved_alignment;
<a name="l00903"></a>00903     GLenum target = GL_TEXTURE_2D;
<a name="l00904"></a>00904 
<a name="l00905"></a>00905     glBindTexture(target, tex);
<a name="l00906"></a>00906     
<a name="l00907"></a>00907 
<a name="l00908"></a>00908     <span class="comment">/* Handle proxy texture checks */</span>
<a name="l00909"></a>00909     <span class="keywordflow">if</span> (flags &amp; AGL_TEXTURE_CHECK_VALID_INTERNAL) { 
<a name="l00910"></a>00910         <span class="comment">/* &lt;bcoconni&gt; allegro_gl_check_texture is broken with GL drivers based</span>
<a name="l00911"></a>00911 <span class="comment">         *  on Mesa. It seems this is a Mesa bug...</span>
<a name="l00912"></a>00912 <span class="comment">         */</span>
<a name="l00913"></a>00913         <span class="keywordflow">if</span> (allegro_gl_info.is_mesa_driver) {
<a name="l00914"></a>00914             AGL_LOG(1, <span class="stringliteral">&quot;* Note * check_texture: Mesa driver detected: &quot;</span>
<a name="l00915"></a>00915                    <span class="stringliteral">&quot;PROXY_TEXTURE_2D tests are skipped\n&quot;</span>);
<a name="l00916"></a>00916             <span class="keywordflow">return</span> tex;
<a name="l00917"></a>00917         }
<a name="l00918"></a>00918         <span class="keywordflow">else</span> {
<a name="l00919"></a>00919             glTexImage2D(GL_PROXY_TEXTURE_2D, 0, internal_format,
<a name="l00920"></a>00920                          bmp-&gt;w, bmp-&gt;h, 0, format, type, NULL);
<a name="l00921"></a>00921 
<a name="l00922"></a>00922             glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D, 0,
<a name="l00923"></a>00923                                      GL_TEXTURE_COMPONENTS, &amp;internal_format);
<a name="l00924"></a>00924 
<a name="l00925"></a>00925             <span class="keywordflow">return</span> (internal_format ? tex : 0);
<a name="l00926"></a>00926         }
<a name="l00927"></a>00927     }
<a name="l00928"></a>00928     
<a name="l00929"></a>00929 
<a name="l00930"></a>00930     <span class="comment">/* Set up pixel transfer mode */</span>
<a name="l00931"></a>00931     glGetIntegerv(GL_UNPACK_ROW_LENGTH, &amp;saved_row_length);
<a name="l00932"></a>00932     glGetIntegerv(GL_UNPACK_ALIGNMENT,  &amp;saved_alignment);
<a name="l00933"></a>00933     glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
<a name="l00934"></a>00934 
<a name="l00935"></a>00935     TRACE(PREFIX_I <span class="stringliteral">&quot;do_texture_upload: Making texture: bpp: %i\n&quot;</span>,
<a name="l00936"></a>00936           bitmap_color_depth(bmp));
<a name="l00937"></a>00937 
<a name="l00938"></a>00938     <span class="comment">/* Generate mipmaps, if needed */</span>
<a name="l00939"></a>00939     <span class="keywordflow">if</span> (flags &amp; AGL_TEXTURE_MIPMAP) {
<a name="l00940"></a>00940         
<a name="l00941"></a>00941         <span class="keywordflow">if</span> (<a class="code" href="group__extensions.html#ga7492f6f6acc608789210560ee63e5436" title="List of OpenGL extensions supported by AllegroGL.">allegro_gl_extensions_GL</a>.SGIS_generate_mipmap) {
<a name="l00942"></a>00942             <span class="comment">/* Easy way out - let the driver do it ;) </span>
<a name="l00943"></a>00943 <span class="comment">             * We do need to set high-qual mipmap generation though.</span>
<a name="l00944"></a>00944 <span class="comment">             */</span>
<a name="l00945"></a>00945             glHint(GL_GENERATE_MIPMAP_HINT, GL_NICEST);
<a name="l00946"></a>00946             glTexParameteri(target, GL_GENERATE_MIPMAP, GL_TRUE);
<a name="l00947"></a>00947             TRACE(PREFIX_I <span class="stringliteral">&quot;do_texture_upload: Using SGIS_generate_mipmap for &quot;</span>
<a name="l00948"></a>00948                   <span class="stringliteral">&quot;mipmap generation.\n&quot;</span>);
<a name="l00949"></a>00949         }
<a name="l00950"></a>00950         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (allegro_gl_info.is_matrox_g200
<a name="l00951"></a>00951              &amp;&amp; (flags &amp; AGL_TEXTURE_MIPMAP) &amp;&amp; (bitmap_color_depth(bmp) &gt;= 24
<a name="l00952"></a>00952                 || bitmap_color_depth(bmp) == 8)
<a name="l00953"></a>00953              &amp;&amp; (bmp-&gt;w != bmp-&gt;h)) {
<a name="l00954"></a>00954                 
<a name="l00955"></a>00955             <span class="comment">/* Matrox G200 has issues with our mipmapping code. Use GLU if we</span>
<a name="l00956"></a>00956 <span class="comment">             * can.</span>
<a name="l00957"></a>00957 <span class="comment">             */</span>
<a name="l00958"></a>00958             TRACE(PREFIX_I <span class="stringliteral">&quot;do_texture_upload: Using GLU for mipmaps.\n&quot;</span>);
<a name="l00959"></a>00959             glPixelStorei(GL_UNPACK_ROW_LENGTH, bmp-&gt;h &gt; 1
<a name="l00960"></a>00960                         ? (bmp-&gt;line[1] - bmp-&gt;line[0]) / bytes_per_pixel
<a name="l00961"></a>00961                         : bmp-&gt;w);
<a name="l00962"></a>00962             glPixelStorei(GL_UNPACK_ROW_LENGTH,
<a name="l00963"></a>00963                                (bmp-&gt;line[1] - bmp-&gt;line[0]) / bytes_per_pixel);
<a name="l00964"></a>00964             gluBuild2DMipmaps(GL_TEXTURE_2D, internal_format, bmp-&gt;w, bmp-&gt;h,
<a name="l00965"></a>00965                               format, type, bmp-&gt;line[0]);
<a name="l00966"></a>00966         }
<a name="l00967"></a>00967         <span class="keywordflow">else</span> {
<a name="l00968"></a>00968             <span class="keywordtype">int</span> w = bmp-&gt;w;
<a name="l00969"></a>00969             <span class="keywordtype">int</span> h = bmp-&gt;h;
<a name="l00970"></a>00970             <span class="keywordtype">int</span> depth = bitmap_color_depth(bmp);
<a name="l00971"></a>00971             
<a name="l00972"></a>00972             <span class="comment">/* The driver can&#39;t generate mipmaps for us. We can&#39;t rely on GLU</span>
<a name="l00973"></a>00973 <span class="comment">             * since the Win32 version doesn&#39;t support any of the new pixel</span>
<a name="l00974"></a>00974 <span class="comment">             * formats. Instead, we&#39;ll use our own downsampler (which only</span>
<a name="l00975"></a>00975 <span class="comment">             * has to work on Allegro BITMAPs)</span>
<a name="l00976"></a>00976 <span class="comment">             */</span>
<a name="l00977"></a>00977             BITMAP *temp = create_bitmap_ex(depth, w / 2, h / 2);
<a name="l00978"></a>00978 
<a name="l00979"></a>00979             <span class="comment">/* We need to generate mipmaps up to 1x1 - compute the number</span>
<a name="l00980"></a>00980 <span class="comment">             * of levels we need.</span>
<a name="l00981"></a>00981 <span class="comment">             */</span>
<a name="l00982"></a>00982             <span class="keywordtype">int</span> num_levels = log2i(MAX(bmp-&gt;w, bmp-&gt;h));
<a name="l00983"></a>00983             
<a name="l00984"></a>00984             <span class="keywordtype">int</span> i, x, y;
<a name="l00985"></a>00985 
<a name="l00986"></a>00986             BITMAP *src, *dest;
<a name="l00987"></a>00987 
<a name="l00988"></a>00988             TRACE(PREFIX_I <span class="stringliteral">&quot;do_texture_upload: Using Allegro for &quot;</span>
<a name="l00989"></a>00989                   <span class="stringliteral">&quot;mipmap generation.\n&quot;</span>);
<a name="l00990"></a>00990 
<a name="l00991"></a>00991             <span class="keywordflow">if</span> (!temp) {
<a name="l00992"></a>00992                 TRACE(PREFIX_E <span class="stringliteral">&quot;do_texture_upload: Unable to create &quot;</span>
<a name="l00993"></a>00993                       <span class="stringliteral">&quot;temporary bitmap sized %ix%ix%i for mipmap generation!&quot;</span>,
<a name="l00994"></a>00994                       w / 2, h / 2, depth);
<a name="l00995"></a>00995                 tex = 0;
<a name="l00996"></a>00996                 <span class="keywordflow">goto</span> end;
<a name="l00997"></a>00997             }
<a name="l00998"></a>00998 
<a name="l00999"></a>00999             src = bmp;
<a name="l01000"></a>01000             dest = temp;
<a name="l01001"></a>01001             
<a name="l01002"></a>01002             <span class="keywordflow">for</span> (i = 1; i &lt;= num_levels; i++) {
<a name="l01003"></a>01003 
<a name="l01004"></a>01004                 <span class="keywordflow">for</span> (y = 0; y &lt; h; y += 2) {
<a name="l01005"></a>01005                     <span class="keywordflow">for</span> (x = 0; x &lt; w; x += 2) {
<a name="l01006"></a>01006 
<a name="l01007"></a>01007                         <span class="keywordtype">int</span> r, g, b, a;
<a name="l01008"></a>01008                         <span class="keywordtype">int</span> pix[4];
<a name="l01009"></a>01009                         <span class="keywordtype">int</span> avg;
<a name="l01010"></a>01010                         
<a name="l01011"></a>01011                         pix[0] = getpixel(src, x,     y);
<a name="l01012"></a>01012                         pix[1] = getpixel(src, x + 1, y);
<a name="l01013"></a>01013                         pix[2] = getpixel(src, x,     y + 1);
<a name="l01014"></a>01014                         pix[3] = getpixel(src, x + 1, y + 1);
<a name="l01015"></a>01015 
<a name="l01016"></a>01016                         <span class="keywordflow">if</span> (w == 1) {
<a name="l01017"></a>01017                             pix[1] = pix[0];
<a name="l01018"></a>01018                             pix[3] = pix[2];
<a name="l01019"></a>01019                         }
<a name="l01020"></a>01020                         <span class="keywordflow">if</span> (h == 1) {
<a name="l01021"></a>01021                             pix[2] = pix[0];
<a name="l01022"></a>01022                             pix[3] = pix[1];
<a name="l01023"></a>01023                         }
<a name="l01024"></a>01024 
<a name="l01025"></a>01025                         <span class="keywordflow">if</span> (flags &amp; AGL_TEXTURE_ALPHA_ONLY) {
<a name="l01026"></a>01026                             avg = (pix[0] + pix[1] + pix[2] + pix[3] + 2) / 4;
<a name="l01027"></a>01027                         }
<a name="l01028"></a>01028                         <span class="keywordflow">else</span> {
<a name="l01029"></a>01029                             r = (getr_depth(depth, pix[0])
<a name="l01030"></a>01030                                + getr_depth(depth, pix[1])
<a name="l01031"></a>01031                                + getr_depth(depth, pix[2])
<a name="l01032"></a>01032                                + getr_depth(depth, pix[3]) + 2) / 4;
<a name="l01033"></a>01033                             g = (getg_depth(depth, pix[0])
<a name="l01034"></a>01034                                + getg_depth(depth, pix[1])
<a name="l01035"></a>01035                                + getg_depth(depth, pix[2])
<a name="l01036"></a>01036                                + getg_depth(depth, pix[3]) + 2) / 4;
<a name="l01037"></a>01037                             b = (getb_depth(depth, pix[0])
<a name="l01038"></a>01038                                + getb_depth(depth, pix[1])
<a name="l01039"></a>01039                                + getb_depth(depth, pix[2])
<a name="l01040"></a>01040                                + getb_depth(depth, pix[3]) + 2) / 4;
<a name="l01041"></a>01041                             a = (geta_depth(depth, pix[0])
<a name="l01042"></a>01042                                + geta_depth(depth, pix[1])
<a name="l01043"></a>01043                                + geta_depth(depth, pix[2])
<a name="l01044"></a>01044                                + geta_depth(depth, pix[3]) + 2) / 4;
<a name="l01045"></a>01045 
<a name="l01046"></a>01046                             avg = makeacol_depth(depth, r, g, b, a);
<a name="l01047"></a>01047                         }
<a name="l01048"></a>01048 
<a name="l01049"></a>01049                         putpixel(dest, x / 2, y / 2, avg);
<a name="l01050"></a>01050                     }
<a name="l01051"></a>01051                 }
<a name="l01052"></a>01052                 src = temp;
<a name="l01053"></a>01053 
<a name="l01054"></a>01054                 <span class="comment">/* Note - we round down; we&#39;re still compatible with</span>
<a name="l01055"></a>01055 <span class="comment">                 * ARB_texture_non_power_of_two.</span>
<a name="l01056"></a>01056 <span class="comment">                 */</span>
<a name="l01057"></a>01057                 w = MAX(w / 2, 1);
<a name="l01058"></a>01058                 h = MAX(h / 2, 1);
<a name="l01059"></a>01059 
<a name="l01060"></a>01060                 TRACE(PREFIX_I <span class="stringliteral">&quot;do_texture_upload: Unpack row length: %li.\n&quot;</span>,
<a name="l01061"></a>01061                       (temp-&gt;h &gt; 1)
<a name="l01062"></a>01062                      ? (<span class="keywordtype">long</span> <span class="keywordtype">int</span>)((temp-&gt;line[1] - temp-&gt;line[0]) / bytes_per_pixel)
<a name="l01063"></a>01063                      : temp-&gt;w);
<a name="l01064"></a>01064 
<a name="l01065"></a>01065                 glPixelStorei(GL_UNPACK_ROW_LENGTH, temp-&gt;h &gt; 1
<a name="l01066"></a>01066                              ? (temp-&gt;line[1] - temp-&gt;line[0]) / bytes_per_pixel
<a name="l01067"></a>01067                              : temp-&gt;w);    
<a name="l01068"></a>01068 
<a name="l01069"></a>01069                 glTexImage2D(GL_TEXTURE_2D, i, internal_format,
<a name="l01070"></a>01070                              w, h, 0, format, type, temp-&gt;line[0]);
<a name="l01071"></a>01071 
<a name="l01072"></a>01072                 TRACE(PREFIX_I <span class="stringliteral">&quot;do_texture_upload: Mipmap level: %i, &quot;</span>
<a name="l01073"></a>01073                       <span class="stringliteral">&quot;size: %i x %i\n&quot;</span>, i, w, h);
<a name="l01074"></a>01074 
<a name="l01075"></a>01075                 TRACE(PREFIX_I <span class="stringliteral">&quot;do_texture_upload: Uploaded texture: level %i, &quot;</span>
<a name="l01076"></a>01076                       <span class="stringliteral">&quot;internalformat: %s, %ix%i, format: 0x%x, type: 0x%x.&quot;</span>
<a name="l01077"></a>01077                       <span class="stringliteral">&quot;\n&quot;</span>, i, __allegro_gl_get_format_description(internal_format),
<a name="l01078"></a>01078                       bmp-&gt;w, bmp-&gt;h, format, type);
<a name="l01079"></a>01079             }
<a name="l01080"></a>01080 
<a name="l01081"></a>01081             destroy_bitmap(temp);
<a name="l01082"></a>01082         }
<a name="l01083"></a>01083     }
<a name="l01084"></a>01084 
<a name="l01085"></a>01085     glPixelStorei(GL_UNPACK_ROW_LENGTH, (bmp-&gt;h &gt; 1)
<a name="l01086"></a>01086                  ? (bmp-&gt;line[1] - bmp-&gt;line[0]) / bytes_per_pixel
<a name="l01087"></a>01087                  : bmp-&gt;w);
<a name="l01088"></a>01088     
<a name="l01089"></a>01089     TRACE(PREFIX_I <span class="stringliteral">&quot;do_texture_upload: Unpack row length: %li.\n&quot;</span>,
<a name="l01090"></a>01090       (bmp-&gt;h &gt; 1) ? (<span class="keywordtype">long</span> <span class="keywordtype">int</span>)((bmp-&gt;line[1] - bmp-&gt;line[0]) / bytes_per_pixel)
<a name="l01091"></a>01091                    : bmp-&gt;w);
<a name="l01092"></a>01092 
<a name="l01093"></a>01093     <span class="comment">/* Upload the base texture */</span>
<a name="l01094"></a>01094     glGetError();
<a name="l01095"></a>01095     glTexImage2D(GL_TEXTURE_2D, 0, internal_format,
<a name="l01096"></a>01096                  bmp-&gt;w, bmp-&gt;h, 0, format, type, bmp-&gt;line[0]);
<a name="l01097"></a>01097 
<a name="l01098"></a>01098     TRACE(PREFIX_I <span class="stringliteral">&quot;do_texture_upload: Uploaded texture: level 0, &quot;</span>
<a name="l01099"></a>01099           <span class="stringliteral">&quot;internalformat: %s, %ix%i, format: 0x%x, type: 0x%x.\n&quot;</span>,
<a name="l01100"></a>01100           __allegro_gl_get_format_description(internal_format),
<a name="l01101"></a>01101           bmp-&gt;w, bmp-&gt;h, format, type);
<a name="l01102"></a>01102     
<a name="l01103"></a>01103     TRACE(PREFIX_I <span class="stringliteral">&quot;do_texture_upload: GL Error code: 0x%x\n&quot;</span>, glGetError());
<a name="l01104"></a>01104 
<a name="l01105"></a>01105     <span class="keywordflow">if</span> (!(flags &amp; AGL_TEXTURE_MIPMAP)) {
<a name="l01106"></a>01106         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
<a name="l01107"></a>01107     }
<a name="l01108"></a>01108     
<a name="l01109"></a>01109 end:
<a name="l01110"></a>01110     <span class="comment">/* Restore state */</span>
<a name="l01111"></a>01111     glPixelStorei(GL_UNPACK_ROW_LENGTH, saved_row_length);
<a name="l01112"></a>01112     glPixelStorei(GL_UNPACK_ALIGNMENT,  saved_alignment);
<a name="l01113"></a>01113 
<a name="l01114"></a>01114     <span class="keywordflow">return</span> tex;
<a name="l01115"></a>01115 }   
<a name="l01116"></a>01116 
<a name="l01117"></a>01117 
<a name="l01118"></a>01118 
<a name="l01119"></a>01119 <span class="comment">/* GLuint allegro_gl_make_texture_ex(int flag, BITMAP *bmp, GLint internal_format) */</span>
<a name="l01165"></a><a class="code" href="group__texture.html#gaf3a48c555068e7051171255c1011150a">01165</a> GLuint <a class="code" href="group__texture.html#gaf3a48c555068e7051171255c1011150a" title="Uploads an Allegro BITMAP to the GL driver as a texture.">allegro_gl_make_texture_ex</a>(<span class="keywordtype">int</span> flags, BITMAP *bmp, GLint internal_format)
<a name="l01166"></a>01166 {
<a name="l01167"></a>01167     GLuint tex = 0, ret = 0;
<a name="l01168"></a>01168     BITMAP *temp = NULL;
<a name="l01169"></a>01169     GLint type;
<a name="l01170"></a>01170     GLint format;
<a name="l01171"></a>01171     GLint old_tex;
<a name="l01172"></a>01172 
<a name="l01173"></a>01173     <span class="comment">/* Print the parameters */</span>
<a name="l01174"></a>01174 <span class="preprocessor">#ifdef DEBUGMODE</span>
<a name="l01175"></a>01175 <span class="preprocessor"></span>    <span class="keywordtype">char</span> buf[1024] = <span class="stringliteral">&quot;&quot;</span>;
<a name="l01176"></a>01176 <span class="preprocessor">#   define PFLAG(name) if (flags &amp; name) strcat(buf, #name &quot;|&quot;);</span>
<a name="l01177"></a>01177 <span class="preprocessor"></span>    PFLAG(AGL_TEXTURE_MIPMAP);
<a name="l01178"></a>01178     PFLAG(AGL_TEXTURE_HAS_ALPHA);
<a name="l01179"></a>01179     PFLAG(AGL_TEXTURE_FLIP);
<a name="l01180"></a>01180     PFLAG(AGL_TEXTURE_MASKED);
<a name="l01181"></a>01181     PFLAG(AGL_TEXTURE_RESCALE);
<a name="l01182"></a>01182     PFLAG(AGL_TEXTURE_ALPHA_ONLY);
<a name="l01183"></a>01183 <span class="preprocessor">#   undef PFLAG</span>
<a name="l01184"></a>01184 <span class="preprocessor"></span>
<a name="l01185"></a>01185     TRACE(PREFIX_I <span class="stringliteral">&quot;make_texture_ex: flags: %s, bitmap %ix%i, %i bpp.\n&quot;</span>, buf,
<a name="l01186"></a>01186           bmp ? bmp-&gt;w : 0, bmp ? bmp-&gt;h : 0,
<a name="l01187"></a>01187           bmp ? bitmap_color_depth(bmp) : 0);
<a name="l01188"></a>01188     <span class="keywordflow">if</span> (internal_format == -1) {
<a name="l01189"></a>01189         TRACE(PREFIX_I <span class="stringliteral">&quot;internalformat: AUTO\n&quot;</span>);
<a name="l01190"></a>01190     }
<a name="l01191"></a>01191     <span class="keywordflow">else</span> {
<a name="l01192"></a>01192         TRACE(PREFIX_I <span class="stringliteral">&quot;internalformat: %s\n&quot;</span>,
<a name="l01193"></a>01193             __allegro_gl_get_format_description(internal_format));
<a name="l01194"></a>01194     }
<a name="l01195"></a>01195 <span class="preprocessor">#endif  </span>
<a name="l01196"></a>01196 <span class="preprocessor"></span>
<a name="l01197"></a>01197     <span class="comment">/* Basic parameter checks */</span>
<a name="l01198"></a>01198     <span class="keywordflow">if</span> (!__allegro_gl_valid_context)
<a name="l01199"></a>01199         <span class="keywordflow">return</span> 0;
<a name="l01200"></a>01200 
<a name="l01201"></a>01201     <span class="keywordflow">if</span> (!bmp) {
<a name="l01202"></a>01202         <span class="keywordflow">return</span> 0;
<a name="l01203"></a>01203     }
<a name="l01204"></a>01204 
<a name="l01205"></a>01205     glGetIntegerv(GL_TEXTURE_2D_BINDING, &amp;old_tex);
<a name="l01206"></a>01206 
<a name="l01207"></a>01207     <span class="comment">/* Voodoo cards don&#39;t seem to support mipmaps for textures over 32x32...</span>
<a name="l01208"></a>01208 <span class="comment">     */</span>
<a name="l01209"></a>01209     <span class="keywordflow">if</span> ((bmp-&gt;w &gt; 32 || bmp-&gt;h &gt; 32) &amp;&amp; (allegro_gl_info.is_voodoo)) {
<a name="l01210"></a>01210         <span class="comment">/* Disable mipmapping if the user didn&#39;t allow us to rescale */</span>
<a name="l01211"></a>01211         <span class="keywordflow">if</span> (!(flags &amp; AGL_TEXTURE_RESCALE)) {
<a name="l01212"></a>01212             TRACE(PREFIX_I <span class="stringliteral">&quot;make_texture_ex: Voodoo card detected &amp;&amp; texture &quot;</span>
<a name="l01213"></a>01213                   <span class="stringliteral">&quot;size &gt; 32 texels &amp;&amp; no rescaling. Disabling mipmaps.\n&quot;</span>);
<a name="l01214"></a>01214             flags &amp;= ~AGL_TEXTURE_MIPMAP;
<a name="l01215"></a>01215         }
<a name="l01216"></a>01216     }
<a name="l01217"></a>01217 
<a name="l01218"></a>01218     <span class="comment">/* Check the maximum texture size */</span>
<a name="l01219"></a>01219     <span class="keywordflow">if</span> (bmp-&gt;w &gt; allegro_gl_info.max_texture_size
<a name="l01220"></a>01220      || bmp-&gt;h &gt; allegro_gl_info.max_texture_size) {
<a name="l01221"></a>01221         <span class="keywordflow">if</span> ((flags &amp; AGL_TEXTURE_RESCALE) == 0) {
<a name="l01222"></a>01222             TRACE(PREFIX_I <span class="stringliteral">&quot;make_texture_ex: Max texture size exceeded but no &quot;</span>
<a name="l01223"></a>01223                   <span class="stringliteral">&quot;rescaling allowed. Returning 0 (unsupported).\n&quot;</span>);
<a name="l01224"></a>01224             <span class="keywordflow">return</span> 0;
<a name="l01225"></a>01225         }
<a name="l01226"></a>01226     }
<a name="l01227"></a>01227 
<a name="l01228"></a>01228     <span class="comment">/* Check power-of-2 */</span>
<a name="l01229"></a>01229     <span class="keywordflow">if</span> (((bmp-&gt;w &amp; (bmp-&gt;w - 1)) || (bmp-&gt;h &amp; (bmp-&gt;h - 1)))
<a name="l01230"></a>01230       &amp;&amp; !(flags &amp; AGL_TEXTURE_RESCALE)
<a name="l01231"></a>01231       &amp;&amp; !<a class="code" href="group__extensions.html#ga7492f6f6acc608789210560ee63e5436" title="List of OpenGL extensions supported by AllegroGL.">allegro_gl_extensions_GL</a>.ARB_texture_non_power_of_two) {
<a name="l01232"></a>01232         TRACE(PREFIX_I <span class="stringliteral">&quot;make_texture_ex: Non-power-of-2 sized bitmap provided, &quot;</span>
<a name="l01233"></a>01233               <span class="stringliteral">&quot;no rescaling allowed, and ARB_texture_non_power_of_two &quot;</span>
<a name="l01234"></a>01234               <span class="stringliteral">&quot;unsupported. Returning 0 (unsupported).\n&quot;</span>);
<a name="l01235"></a>01235         <span class="keywordflow">return</span> 0;
<a name="l01236"></a>01236     }
<a name="l01237"></a>01237     
<a name="l01238"></a>01238     
<a name="l01239"></a>01239     <span class="comment">/* Get OpenGL format and type for this pixel data */</span>
<a name="l01240"></a>01240     format = __allegro_gl_get_bitmap_color_format(bmp, flags);
<a name="l01241"></a>01241     type = __allegro_gl_get_bitmap_type(bmp, flags);
<a name="l01242"></a>01242     
<a name="l01243"></a>01243     <span class="keywordflow">if</span> (flags &amp; AGL_TEXTURE_ALPHA_ONLY) {
<a name="l01244"></a>01244         type   = GL_UNSIGNED_BYTE;
<a name="l01245"></a>01245         <span class="keywordflow">if</span> (internal_format == GL_ALPHA || internal_format == GL_ALPHA4
<a name="l01246"></a>01246          || internal_format == GL_ALPHA8) {
<a name="l01247"></a>01247             format = GL_ALPHA;
<a name="l01248"></a>01248         }
<a name="l01249"></a>01249         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (internal_format == GL_INTENSITY
<a name="l01250"></a>01250               || internal_format == GL_INTENSITY4
<a name="l01251"></a>01251               || internal_format == GL_INTENSITY8) {
<a name="l01252"></a>01252             format = GL_RED;
<a name="l01253"></a>01253         }
<a name="l01254"></a>01254         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (internal_format == GL_LUMINANCE
<a name="l01255"></a>01255               || internal_format == GL_LUMINANCE4
<a name="l01256"></a>01256               || internal_format == GL_LUMINANCE8) {
<a name="l01257"></a>01257             format = GL_LUMINANCE;
<a name="l01258"></a>01258         }
<a name="l01259"></a>01259 
<a name="l01260"></a>01260         <span class="comment">/* Alpha bitmaps must be 8-bpp */</span>
<a name="l01261"></a>01261         <span class="keywordflow">if</span> (bitmap_color_depth(bmp) != 8) {
<a name="l01262"></a>01262             <span class="keywordflow">return</span> 0;
<a name="l01263"></a>01263         }
<a name="l01264"></a>01264     }
<a name="l01265"></a>01265 
<a name="l01266"></a>01266     <span class="keywordflow">if</span> (flags &amp; AGL_TEXTURE_MASKED) {
<a name="l01267"></a>01267         flags |= AGL_TEXTURE_FORCE_ALPHA_INTERNAL;
<a name="l01268"></a>01268     }
<a name="l01269"></a>01269 
<a name="l01270"></a>01270     TRACE(PREFIX_I <span class="stringliteral">&quot;make_texture_ex: Preselected texture format: %s, &quot;</span>
<a name="l01271"></a>01271           <span class="stringliteral">&quot;type: 0x%x\n&quot;</span>, __allegro_gl_get_format_description(format), type);
<a name="l01272"></a>01272     
<a name="l01273"></a>01273     <span class="comment">/* Munge the bitmap if needed (rescaling, alpha channel, etc) */</span>
<a name="l01274"></a>01274     temp = __allegro_gl_munge_bitmap(flags, bmp, 0, 0, bmp-&gt;w, bmp-&gt;h,
<a name="l01275"></a>01275                                      &amp;type, &amp;format);
<a name="l01276"></a>01276     <span class="keywordflow">if</span> (temp) {
<a name="l01277"></a>01277         bmp = temp;
<a name="l01278"></a>01278     }
<a name="l01279"></a>01279     
<a name="l01280"></a>01280     <span class="keywordflow">if</span> (internal_format == -1) {
<a name="l01281"></a>01281         internal_format = __allegro_gl_get_texture_format_ex(bmp, flags);
<a name="l01282"></a>01282         TRACE(PREFIX_I <span class="stringliteral">&quot;make_texture_ex: Picked internalformat: %s\n&quot;</span>,
<a name="l01283"></a>01283               __allegro_gl_get_format_description(internal_format));
<a name="l01284"></a>01284     }
<a name="l01285"></a>01285 
<a name="l01286"></a>01286     <span class="keywordflow">if</span> (internal_format == -1) {
<a name="l01287"></a>01287         TRACE(PREFIX_E <span class="stringliteral">&quot;make_texture_ex: Invalid internal format!: &quot;</span>
<a name="l01288"></a>01288               <span class="stringliteral">&quot;%s\n&quot;</span>, __allegro_gl_get_format_description(internal_format));
<a name="l01289"></a>01289         <span class="keywordflow">goto</span> end;
<a name="l01290"></a>01290     }
<a name="l01291"></a>01291     
<a name="l01292"></a>01292     TRACE(PREFIX_I <span class="stringliteral">&quot;make_texture_ex: dest format=%s, source format=%s, &quot;</span>
<a name="l01293"></a>01293           <span class="stringliteral">&quot;type=0x%x\n&quot;</span>, __allegro_gl_get_format_description(internal_format),
<a name="l01294"></a>01294               __allegro_gl_get_format_description(format), (<span class="keywordtype">int</span>)type);
<a name="l01295"></a>01295 
<a name="l01296"></a>01296     
<a name="l01297"></a>01297     <span class="comment">/* ATI Radeon 7000 inverts R and B components when generating mipmaps and</span>
<a name="l01298"></a>01298 <span class="comment">     * the internal format is GL_RGB8, but only on mipmaps. Instead, we&#39;ll use</span>
<a name="l01299"></a>01299 <span class="comment">     * GL_RGBA8. This works for bitmaps of depth &lt;= 24. For 32-bpp bitmaps,</span>
<a name="l01300"></a>01300 <span class="comment">     * some additional tricks are needed: We must fill in alpha with 255.</span>
<a name="l01301"></a>01301 <span class="comment">     */</span>
<a name="l01302"></a>01302     <span class="keywordflow">if</span> (allegro_gl_info.is_ati_radeon_7000 &amp;&amp; (flags &amp; AGL_TEXTURE_MIPMAP)
<a name="l01303"></a>01303      &amp;&amp; internal_format == GL_RGB8
<a name="l01304"></a>01304      &amp;&amp; <a class="code" href="group__extensions.html#ga7492f6f6acc608789210560ee63e5436" title="List of OpenGL extensions supported by AllegroGL.">allegro_gl_extensions_GL</a>.SGIS_generate_mipmap) {
<a name="l01305"></a>01305 
<a name="l01306"></a>01306         <span class="keywordtype">int</span> i, j;
<a name="l01307"></a>01307         <span class="keywordtype">int</span> depth = bitmap_color_depth(bmp);
<a name="l01308"></a>01308 
<a name="l01309"></a>01309         TRACE(PREFIX_I <span class="stringliteral">&quot;make_texture_ex: ATI Radeon 7000 detected, mipmapping &quot;</span>
<a name="l01310"></a>01310               <span class="stringliteral">&quot;used, SGIS_generate_mipmap available and selected &quot;</span>
<a name="l01311"></a>01311               <span class="stringliteral">&quot;internalformat is GL_RGB8 but format is GL_RGBA. Working around &quot;</span>
<a name="l01312"></a>01312               <span class="stringliteral">&quot;ATI driver bug by upgrading bitmap to 32-bpp and using GL_RGBA8 &quot;</span>
<a name="l01313"></a>01313               <span class="stringliteral">&quot;instead.\n&quot;</span>);
<a name="l01314"></a>01314 
<a name="l01315"></a>01315         <span class="keywordflow">if</span> (depth == 32) {
<a name="l01316"></a>01316 
<a name="l01317"></a>01317             <span class="comment">/* Create temp bitmap if not already there */</span>
<a name="l01318"></a>01318             <span class="keywordflow">if</span> (!temp) {
<a name="l01319"></a>01319                 temp = create_bitmap_ex(depth, bmp-&gt;w, bmp-&gt;h);
<a name="l01320"></a>01320                 <span class="keywordflow">if</span> (!temp) {
<a name="l01321"></a>01321                     TRACE(PREFIX_E <span class="stringliteral">&quot;make_texture_ex: Unable to allocate &quot;</span>
<a name="l01322"></a>01322                           <span class="stringliteral">&quot;memory for temporary bitmap (Radeon 7000 path)!\n&quot;</span>);
<a name="l01323"></a>01323                     <span class="keywordflow">goto</span> end;
<a name="l01324"></a>01324                 }
<a name="l01325"></a>01325                 blit(bmp, temp, 0, 0, 0, 0, bmp-&gt;w, bmp-&gt;h);
<a name="l01326"></a>01326                 bmp = temp;
<a name="l01327"></a>01327             }
<a name="l01328"></a>01328             
<a name="l01329"></a>01329             <span class="comment">/* Slow path, until ATI finally gets around to fixing their</span>
<a name="l01330"></a>01330 <span class="comment">             * drivers.</span>
<a name="l01331"></a>01331 <span class="comment">             *</span>
<a name="l01332"></a>01332 <span class="comment">             * Note: If destination internal format was GL_RGBx, then no masking</span>
<a name="l01333"></a>01333 <span class="comment">             * code is needed.</span>
<a name="l01334"></a>01334 <span class="comment">             */</span>
<a name="l01335"></a>01335             <span class="keywordflow">for</span> (j = 0; j &lt; bmp-&gt;h; j++) {
<a name="l01336"></a>01336                 <span class="keywordflow">for</span> (i = 0; i &lt; bmp-&gt;w; i++) {
<a name="l01337"></a>01337                     <span class="keywordtype">int</span> pix = _getpixel32(bmp, i, j);
<a name="l01338"></a>01338                     _putpixel32(bmp, i, j,
<a name="l01339"></a>01339                         makeacol32(getr32(pix), getg32(pix), getb32(pix), 255));
<a name="l01340"></a>01340                 }
<a name="l01341"></a>01341             }
<a name="l01342"></a>01342         }
<a name="l01343"></a>01343         internal_format = GL_RGBA8;
<a name="l01344"></a>01344     }
<a name="l01345"></a>01345     
<a name="l01346"></a>01346 
<a name="l01347"></a>01347     <span class="comment">/* Generate the texture */</span>
<a name="l01348"></a>01348     glGenTextures(1, &amp;tex);
<a name="l01349"></a>01349     <span class="keywordflow">if</span> (!tex) {
<a name="l01350"></a>01350         TRACE(PREFIX_E <span class="stringliteral">&quot;make_texture_ex: Unable to create GL texture!\n&quot;</span>);
<a name="l01351"></a>01351         <span class="keywordflow">goto</span> end;
<a name="l01352"></a>01352     }
<a name="l01353"></a>01353 
<a name="l01354"></a>01354     ret = do_texture_upload(bmp, tex, internal_format, format, type, flags);
<a name="l01355"></a>01355 
<a name="l01356"></a>01356 end:
<a name="l01357"></a>01357     <span class="keywordflow">if</span> (temp) {
<a name="l01358"></a>01358         destroy_bitmap(temp);
<a name="l01359"></a>01359     }
<a name="l01360"></a>01360 
<a name="l01361"></a>01361     <span class="keywordflow">if</span> (!ret &amp;&amp; tex) {
<a name="l01362"></a>01362         glDeleteTextures(1, &amp;tex);
<a name="l01363"></a>01363     }
<a name="l01364"></a>01364 
<a name="l01365"></a>01365     glBindTexture(GL_TEXTURE_2D, old_tex);
<a name="l01366"></a>01366 
<a name="l01367"></a>01367     <span class="keywordflow">return</span> tex;
<a name="l01368"></a>01368 }
<a name="l01369"></a>01369 
<a name="l01370"></a>01370 
<a name="l01371"></a>01371 
<a name="l01372"></a>01372 
<a name="l01373"></a>01373 
<a name="l01374"></a>01374 <span class="comment">/* GLuint allegro_gl_make_texture(BITMAP *bmp) */</span>
<a name="l01383"></a><a class="code" href="group__texture.html#gae071354f76bc28e1bafbd90bdecbc0c9">01383</a> GLuint <a class="code" href="group__texture.html#gae071354f76bc28e1bafbd90bdecbc0c9" title="Uploads an Allegro BITMAP to the GL driver as a texture.">allegro_gl_make_texture</a>(BITMAP *bmp) {
<a name="l01384"></a>01384         
<a name="l01385"></a>01385     <span class="keywordtype">int</span> flags = __allegro_gl_convert_flags(0);
<a name="l01386"></a>01386     
<a name="l01387"></a>01387     <span class="keywordflow">return</span> <a class="code" href="group__texture.html#gaf3a48c555068e7051171255c1011150a" title="Uploads an Allegro BITMAP to the GL driver as a texture.">allegro_gl_make_texture_ex</a>(flags, bmp,
<a name="l01388"></a>01388                                      allegro_gl_opengl_internal_texture_format);
<a name="l01389"></a>01389 }
<a name="l01390"></a>01390 
<a name="l01391"></a>01391 
<a name="l01392"></a>01392 
<a name="l01393"></a>01393 <span class="comment">/* GLuint allegro_gl_make_masked_texture(BITMAP *bmp) */</span>
<a name="l01402"></a><a class="code" href="group__texture.html#gaeb33dfbbc1725f5132c10ac32ef6800d">01402</a> GLuint <a class="code" href="group__texture.html#gaeb33dfbbc1725f5132c10ac32ef6800d" title="Uploads an Allegro BITMAP to the GL driver as a texture.">allegro_gl_make_masked_texture</a>(BITMAP *bmp) {
<a name="l01403"></a>01403         
<a name="l01404"></a>01404     <span class="keywordtype">int</span> flags = __allegro_gl_convert_flags(AGL_TEXTURE_MASKED);
<a name="l01405"></a>01405 
<a name="l01406"></a>01406     <span class="keywordflow">return</span> <a class="code" href="group__texture.html#gaf3a48c555068e7051171255c1011150a" title="Uploads an Allegro BITMAP to the GL driver as a texture.">allegro_gl_make_texture_ex</a>(flags, bmp,
<a name="l01407"></a>01407                                      allegro_gl_opengl_internal_texture_format);
<a name="l01408"></a>01408 }
<a name="l01409"></a>01409 
<a name="l01410"></a>01410 
<a name="l01411"></a>01411 
<a name="l01412"></a>01412 <span class="comment">/* GLenum allegro_gl_get_bitmap_type(BITMAP *bmp) */</span>
<a name="l01433"></a><a class="code" href="group__texture.html#ga59f7129dd541d2e5a291d36bf90b7289">01433</a> GLenum <a class="code" href="group__texture.html#ga59f7129dd541d2e5a291d36bf90b7289" title="AllegroGL will generate mipmaps for this texture.">allegro_gl_get_bitmap_type</a>(BITMAP *bmp) {
<a name="l01434"></a>01434 
<a name="l01435"></a>01435     <span class="keywordtype">int</span> flags = __allegro_gl_convert_flags(0);
<a name="l01436"></a>01436     <span class="keywordflow">return</span> __allegro_gl_get_bitmap_type(bmp, flags);
<a name="l01437"></a>01437 }
<a name="l01438"></a>01438 
<a name="l01439"></a>01439 
<a name="l01440"></a>01440 
<a name="l01441"></a>01441 <span class="comment">/* GLenum allegro_gl_get_bitmap_color_format(BITMAP *bmp) */</span>
<a name="l01456"></a><a class="code" href="group__texture.html#ga83b2b13cb35dd4b4e9e874173a246581">01456</a> GLenum <a class="code" href="group__texture.html#ga83b2b13cb35dd4b4e9e874173a246581" title="AllegroGL will generate mipmaps for this texture.">allegro_gl_get_bitmap_color_format</a>(BITMAP *bmp) {
<a name="l01457"></a>01457 
<a name="l01458"></a>01458     <span class="keywordtype">int</span> flags = __allegro_gl_convert_flags(0);
<a name="l01459"></a>01459     <span class="keywordflow">return</span> __allegro_gl_get_bitmap_color_format(bmp, flags);
<a name="l01460"></a>01460 }
<a name="l01461"></a>01461 
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