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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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<div class="title">OpenGL Extensions</div> </div>
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<p>Management of the OpenGL extensions mechanism.
<a href="#details">More...</a></p>
<table class="memberdecls">
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Functions</h2></td></tr>
<tr class="memitem:ga7351f56ea1c4f4665193fc3bf547ff0a"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__extensions.html#ga7351f56ea1c4f4665193fc3bf547ff0a">allegro_gl_is_extension_supported</a> (AL_CONST char *extension)</td></tr>
<tr class="memdesc:ga7351f56ea1c4f4665193fc3bf547ff0a"><td class="mdescLeft"> </td><td class="mdescRight">This function is an helper to determine whether an OpenGL extension is available or not. <a href="#ga7351f56ea1c4f4665193fc3bf547ff0a">More...</a><br /></td></tr>
<tr class="separator:ga7351f56ea1c4f4665193fc3bf547ff0a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaa0c2cd7c4b4a94e8801af42a58356cc4"><td class="memItemLeft" align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__extensions.html#gaa0c2cd7c4b4a94e8801af42a58356cc4">allegro_gl_get_proc_address</a> (AL_CONST char *name)</td></tr>
<tr class="memdesc:gaa0c2cd7c4b4a94e8801af42a58356cc4"><td class="mdescLeft"> </td><td class="mdescRight">Helper to get the address of an OpenGL symbol. <a href="#gaa0c2cd7c4b4a94e8801af42a58356cc4">More...</a><br /></td></tr>
<tr class="separator:gaa0c2cd7c4b4a94e8801af42a58356cc4"><td class="memSeparator" colspan="2"> </td></tr>
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Variables</h2></td></tr>
<tr class="memitem:ga7492f6f6acc608789210560ee63e5436"><td class="memItemLeft" align="right" valign="top">struct AGL_EXTENSION_LIST_GL </td><td class="memItemRight" valign="bottom"><a class="el" href="group__extensions.html#ga7492f6f6acc608789210560ee63e5436">allegro_gl_extensions_GL</a></td></tr>
<tr class="memdesc:ga7492f6f6acc608789210560ee63e5436"><td class="mdescLeft"> </td><td class="mdescRight">List of OpenGL extensions supported by AllegroGL. <a href="#ga7492f6f6acc608789210560ee63e5436">More...</a><br /></td></tr>
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<tr class="memitem:ga2d6ebb26eec58470e4242b750656268b"><td class="memItemLeft" align="right" valign="top">AGL_EXT * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__extensions.html#ga2d6ebb26eec58470e4242b750656268b">agl_extension_table</a> = NULL</td></tr>
<tr class="memdesc:ga2d6ebb26eec58470e4242b750656268b"><td class="mdescLeft"> </td><td class="mdescRight">List of GLX extensions supported by AllegroGL. <a href="#ga2d6ebb26eec58470e4242b750656268b">More...</a><br /></td></tr>
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OpenGL Extensions Management Functions</h2></td></tr>
<tr class="memitem:gac45f9222ac965c8d0d756f513cebf0d1"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__extensions.html#gac45f9222ac965c8d0d756f513cebf0d1">AGL_DEFINE_PROC_TYPE</a></td></tr>
<tr class="memdesc:gac45f9222ac965c8d0d756f513cebf0d1"><td class="mdescLeft"> </td><td class="mdescRight">OpenGL extensions handlers helper. <a href="#gac45f9222ac965c8d0d756f513cebf0d1">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>Management of the OpenGL extensions mechanism. </p>
<p>AllegroGL provides two ways to access OpenGL extensions: It's native extension library and some versatile portable routines.</p>
<p>If you want to get more control on extensions or if you want to use an extension that is not supported by AllegroGL then you can use the routines : <a class="el" href="group__extensions.html#ga7351f56ea1c4f4665193fc3bf547ff0a" title="This function is an helper to determine whether an OpenGL extension is available or not...">allegro_gl_is_extension_supported()</a> and <a class="el" href="group__extensions.html#gaa0c2cd7c4b4a94e8801af42a58356cc4" title="Helper to get the address of an OpenGL symbol. ">allegro_gl_get_proc_address()</a>. They provide a way to determine if an extension is available and to get its address. These routines are available on every platforms that AllegroGL supports </p>
<h2 class="groupheader">Macro Definition Documentation</h2>
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<td class="memname">#define AGL_DEFINE_PROC_TYPE</td>
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<p>OpenGL extensions handlers helper. </p>
<p>Defines a function pointer type. This macro is almost equivalent to a <b>typedef</b>. It is intended to hide some platform-specific machinery in order to keep code portable.</p>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="group__extensions.html#gaa0c2cd7c4b4a94e8801af42a58356cc4" title="Helper to get the address of an OpenGL symbol. ">allegro_gl_get_proc_address()</a> </dd></dl>
<p>Definition at line <a class="el" href="alleggl_8h_source.html#l00754">754</a> of file <a class="el" href="alleggl_8h_source.html">alleggl.h</a>.</p>
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<h2 class="groupheader">Function Documentation</h2>
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<td class="memname">int allegro_gl_is_extension_supported </td>
<td>(</td>
<td class="paramtype">AL_CONST char * </td>
<td class="paramname"><em>extension</em></td><td>)</td>
<td></td>
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<p>This function is an helper to determine whether an OpenGL extension is available or not. </p>
<p><b>Example:</b> </p><pre>
int packedpixels =
allegro_gl_is_extension_supported("GL_EXT_packed_pixels");
</pre><p> If <code>packedpixels</code> is TRUE then you can safely use the constants related to the packed pixels extension.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">extension</td><td>The name of the extension that is needed </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>TRUE if the extension is available FALSE otherwise. </dd></dl>
<p>Definition at line <a class="el" href="glext_8c_source.html#l00306">306</a> of file <a class="el" href="glext_8c_source.html">glext.c</a>.</p>
<p>Referenced by <a class="el" href="alleggl_8c_source.html#l00971">allegro_gl_opengl_version()</a>.</p>
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<td class="memname">void* allegro_gl_get_proc_address </td>
<td>(</td>
<td class="paramtype">AL_CONST char * </td>
<td class="paramname"><em>name</em></td><td>)</td>
<td></td>
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<p>Helper to get the address of an OpenGL symbol. </p>
<p><b>Example:</b> How to get the function <code>glMultiTexCoord3fARB</code> that comes with ARB's Multitexture extension : </p><pre>
// define the type of the function
AGL_DEFINE_PROC_TYPE(void, MULTI_TEX_FUNC,
(GLenum, GLfloat, GLfloat, GLfloat));
// declare the function pointer
MULTI_TEX_FUNC glMultiTexCoord3fARB;
// get the address of the function
glMultiTexCoord3fARB = (MULTI_TEX_FUNC) allegro_gl_get_proc_address(
"glMultiTexCoord3fARB");
</pre><p>If <code>glMultiTexCoord3fARB</code> is not <code>NULL</code> then it can be used as if it has been defined in the OpenGL core library. Note that the use of the AGL_DEFINE_PROC_TYPE macro is mandatory if you want your program to be portable.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">name</td><td>The name of the symbol you want to link to. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>A pointer to the symbol if available or NULL otherwise. </dd></dl>
<p>Definition at line <a class="el" href="glext_8c_source.html#l00372">372</a> of file <a class="el" href="glext_8c_source.html">glext.c</a>.</p>
<p>References <a class="el" href="glext_8c_source.html#l00055">allegro_gl_extensions_GL</a>, and <a class="el" href="alleggl_8c_source.html#l00971">allegro_gl_opengl_version()</a>.</p>
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<h2 class="groupheader">Variable Documentation</h2>
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<td class="memname">struct AGL_EXTENSION_LIST_GL allegro_gl_extensions_GL</td>
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<p>List of OpenGL extensions supported by AllegroGL. </p>
<p>Each entry of this structure is an int which is either set to 1, if the corresponding extension is available on the host system, or 0 otherwise.</p>
<p>Extension names use only the base name. For example, GL_ARB_multitexture should be refered to by: </p><pre>
allegro_gl_extensions_GL.ARB_multitexture
</pre><dl class="section see"><dt>See also</dt><dd>allegro_gl_extensions_GLX allegro_gl_extensions_WGL </dd></dl>
<p>Definition at line <a class="el" href="glext_8c_source.html#l00055">55</a> of file <a class="el" href="glext_8c_source.html">glext.c</a>.</p>
<p>Referenced by <a class="el" href="texture_8c_source.html#l00557">allegro_gl_check_texture()</a>, <a class="el" href="glext_8c_source.html#l00372">allegro_gl_get_proc_address()</a>, <a class="el" href="texture_8c_source.html#l01165">allegro_gl_make_texture_ex()</a>, <a class="el" href="glvtable_8c_source.html#l00170">allegro_gl_screen_release()</a>, <a class="el" href="videovtb_8c_source.html#l00448">allegro_gl_video_release()</a>, and <a class="el" href="gui_8c_source.html#l00477">d_algl_viewport_proc()</a>.</p>
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<td class="memname">AGL_EXT* agl_extension_table = NULL</td>
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<p>List of GLX extensions supported by AllegroGL. </p>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="group__extensions.html#ga7492f6f6acc608789210560ee63e5436" title="List of OpenGL extensions supported by AllegroGL. ">allegro_gl_extensions_GL</a> allegro_gl_extensions_WGL List of WGL <a class="el" href="group__extensions.html" title="Management of the OpenGL extensions mechanism. ">OpenGL Extensions</a> supported by AllegroGL.</dd>
<dd>
<a class="el" href="group__extensions.html#ga7492f6f6acc608789210560ee63e5436" title="List of OpenGL extensions supported by AllegroGL. ">allegro_gl_extensions_GL</a> allegro_gl_extensions_GLX </dd></dl>
<p>Definition at line <a class="el" href="glext_8c_source.html#l00082">82</a> of file <a class="el" href="glext_8c_source.html">glext.c</a>.</p>
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