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<h1>math.c</h1> </div>
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<div class="contents">
<a href="math_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="l00015"></a>00015 <span class="preprocessor">#include <math.h></span>
<a name="l00016"></a>00016 <span class="preprocessor">#include <allegro.h></span>
<a name="l00017"></a>00017 <span class="preprocessor">#include "alleggl.h"</span>
<a name="l00018"></a>00018 <span class="preprocessor">#include "allglint.h"</span>
<a name="l00019"></a>00019
<a name="l00020"></a>00020
<a name="l00021"></a>00021 <span class="preprocessor">#ifndef M_PI</span>
<a name="l00022"></a>00022 <span class="preprocessor"></span><span class="preprocessor"> #define M_PI 3.14159265358979323846</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span>
<a name="l00025"></a>00025
<a name="l00026"></a>00026 <span class="preprocessor">#define ALGL_NOCONV(x) x</span>
<a name="l00027"></a>00027 <span class="preprocessor"></span>
<a name="l00028"></a>00028 <span class="preprocessor">#define TRANSLATE_AL_TO_GL(al_type, gl_type, convertor) \</span>
<a name="l00029"></a>00029 <span class="preprocessor"> void allegro_gl_##al_type##_to_##gl_type (al_type *m, gl_type gl[16]) \</span>
<a name="l00030"></a>00030 <span class="preprocessor"> { \</span>
<a name="l00031"></a>00031 <span class="preprocessor"> int col, row; \</span>
<a name="l00032"></a>00032 <span class="preprocessor"> for (col = 0; col < 3; col++) \</span>
<a name="l00033"></a>00033 <span class="preprocessor"> for (row = 0; row < 3; row++) \</span>
<a name="l00034"></a>00034 <span class="preprocessor"> gl[col*4+row] = convertor (m->v[col][row]); \</span>
<a name="l00035"></a>00035 <span class="preprocessor"> for (row = 0; row < 3; row++) \</span>
<a name="l00036"></a>00036 <span class="preprocessor"> gl[12+row] = convertor (m->t[row]); \</span>
<a name="l00037"></a>00037 <span class="preprocessor"> for (col = 0; col < 3; col++) \</span>
<a name="l00038"></a>00038 <span class="preprocessor"> gl[4*col + 3] = 0; \</span>
<a name="l00039"></a>00039 <span class="preprocessor"> gl[15] = 1; \</span>
<a name="l00040"></a>00040 <span class="preprocessor"> }</span>
<a name="l00041"></a>00041 <span class="preprocessor"></span>
<a name="l00042"></a>00042
<a name="l00043"></a>00043
<a name="l00066"></a><a class="code" href="group__math.html#ga4cf4f453cb3f95a1e7e861a7401b4a8d">00066</a> TRANSLATE_AL_TO_GL(MATRIX, GLfloat, fixtof)
<a name="l00067"></a>00067
<a name="l00068"></a>00068
<a name="l00069"></a>00069
<a name="l00070"></a>00070
<a name="l00082"></a><a class="code" href="group__math.html#gaee6cb48f8e3e70abecc6c282a8ea1edc">00082</a> TRANSLATE_AL_TO_GL(MATRIX, GLdouble, fixtof)
<a name="l00083"></a>00083
<a name="l00084"></a>00084
<a name="l00085"></a>00085
<a name="l00098"></a><a class="code" href="group__math.html#gae8e0ee18b9aeca955402be16de6ca79d">00098</a> TRANSLATE_AL_TO_GL(MATRIX_f, GLfloat, ALGL_NOCONV)
<a name="l00099"></a>00099
<a name="l00100"></a>00100
<a name="l00101"></a>00101
<a name="l00114"></a>00114 TRANSLATE_AL_TO_GL(MATRIX_f, GLdouble, ALGL_NOCONV)
<a name="l00115"></a>00115
<a name="l00116"></a>00116
<a name="l00117"></a>00117
<a name="l00118"></a>00118 <span class="preprocessor">#define TRANSLATE_GL_TO_AL(gl_type, al_type, convertor) \</span>
<a name="l00119"></a>00119 <span class="preprocessor"> void allegro_gl_##gl_type##_to_##al_type (gl_type gl[16], al_type *m) \</span>
<a name="l00120"></a>00120 <span class="preprocessor"> { \</span>
<a name="l00121"></a>00121 <span class="preprocessor"> int col, row; \</span>
<a name="l00122"></a>00122 <span class="preprocessor"> for (col = 0; col < 3; col++) \</span>
<a name="l00123"></a>00123 <span class="preprocessor"> for (row = 0; row < 3; row++) \</span>
<a name="l00124"></a>00124 <span class="preprocessor"> m->v[col][row] = convertor (gl[col*4+row]); \</span>
<a name="l00125"></a>00125 <span class="preprocessor"> for (row = 0; row < 3; row++) \</span>
<a name="l00126"></a>00126 <span class="preprocessor"> m->t[row] = convertor (gl[12+row]); \</span>
<a name="l00127"></a>00127 <span class="preprocessor"> }</span>
<a name="l00128"></a>00128 <span class="preprocessor"></span>
<a name="l00129"></a>00129
<a name="l00130"></a>00130
<a name="l00143"></a>00143 TRANSLATE_GL_TO_AL(GLfloat, MATRIX, ftofix)
<a name="l00144"></a>00144
<a name="l00145"></a>00145
<a name="l00146"></a>00146
<a name="l00147"></a>00147
<a name="l00159"></a>00159 TRANSLATE_GL_TO_AL(GLdouble, MATRIX, ftofix)
<a name="l00160"></a>00160
<a name="l00161"></a>00161
<a name="l00162"></a>00162
<a name="l00175"></a>00175 TRANSLATE_GL_TO_AL(GLfloat, MATRIX_f, ALGL_NOCONV)
<a name="l00176"></a>00176
<a name="l00177"></a>00177
<a name="l00178"></a>00178
<a name="l00192"></a>00192 TRANSLATE_GL_TO_AL(GLdouble, MATRIX_f, ALGL_NOCONV)
<a name="l00193"></a>00193
<a name="l00194"></a>00194
<a name="l00195"></a>00195 <span class="preprocessor">#undef ALGL_NOCONV</span>
<a name="l00196"></a>00196 <span class="preprocessor"></span>
<a name="l00197"></a>00197
<a name="l00198"></a>00198 <span class="preprocessor">#ifndef RAD_2_DEG</span>
<a name="l00199"></a>00199 <span class="preprocessor"></span><span class="preprocessor"> #define RAD_2_DEG(a) ((a) * 180 / M_PI)</span>
<a name="l00200"></a>00200 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00201"></a>00201 <span class="preprocessor"></span>
<a name="l00202"></a>00202
<a name="l00203"></a>00203
<a name="l00204"></a>00204 <span class="comment">/* void allegro_gl_apply_quat(QUAT *q) */</span>
<a name="l00222"></a>00222 <span class="keywordtype">void</span> allegro_gl_apply_quat(QUAT *q) {
<a name="l00223"></a>00223
<a name="l00224"></a>00224 <span class="keywordtype">float</span> theta;
<a name="l00225"></a>00225 ASSERT(q);
<a name="l00226"></a>00226 ASSERT(__allegro_gl_valid_context);
<a name="l00227"></a>00227
<a name="l00228"></a>00228 theta = RAD_2_DEG(2 * acos(q->w));
<a name="l00229"></a>00229 <span class="keywordflow">if</span> (q->w < 1.0f && q->w > -1.0f)
<a name="l00230"></a>00230 glRotatef(theta, q->x, q->y, q->z);
<a name="l00231"></a>00231
<a name="l00232"></a>00232 <span class="keywordflow">return</span>;
<a name="l00233"></a>00233 }
<a name="l00234"></a>00234
<a name="l00235"></a>00235
<a name="l00236"></a>00236
<a name="l00237"></a>00237 <span class="comment">/* void allegro_gl_quat_to_glrotatef(QUAT *q, float *angle, float *x, float *y, float *z) */</span>
<a name="l00258"></a>00258 <span class="keywordtype">void</span> allegro_gl_quat_to_glrotatef(QUAT *q, <span class="keywordtype">float</span> *angle, <span class="keywordtype">float</span> *x, <span class="keywordtype">float</span> *y, <span class="keywordtype">float</span> *z) {
<a name="l00259"></a>00259
<a name="l00260"></a>00260 ASSERT(q);
<a name="l00261"></a>00261 ASSERT(angle);
<a name="l00262"></a>00262 ASSERT(x);
<a name="l00263"></a>00263 ASSERT(y);
<a name="l00264"></a>00264 ASSERT(z);
<a name="l00265"></a>00265
<a name="l00266"></a>00266 *angle = RAD_2_DEG(2 * acos(q->w));
<a name="l00267"></a>00267 *x = q->x;
<a name="l00268"></a>00268 *y = q->y;
<a name="l00269"></a>00269 *z = q->z;
<a name="l00270"></a>00270
<a name="l00271"></a>00271 <span class="keywordflow">return</span>;
<a name="l00272"></a>00272 }
<a name="l00273"></a>00273
<a name="l00274"></a>00274
<a name="l00275"></a>00275
<a name="l00276"></a>00276 <span class="comment">/* void allegro_gl_quat_to_glrotated(QUAT *q, double *angle, double *x, double *y, double *z) */</span>
<a name="l00290"></a>00290 <span class="keywordtype">void</span> allegro_gl_quat_to_glrotated(QUAT *q, <span class="keywordtype">double</span> *angle, <span class="keywordtype">double</span> *x, <span class="keywordtype">double</span> *y, <span class="keywordtype">double</span> *z) {
<a name="l00291"></a>00291
<a name="l00292"></a>00292 ASSERT(q);
<a name="l00293"></a>00293 ASSERT(angle);
<a name="l00294"></a>00294 ASSERT(x);
<a name="l00295"></a>00295 ASSERT(y);
<a name="l00296"></a>00296 ASSERT(z);
<a name="l00297"></a>00297
<a name="l00298"></a>00298 *angle = RAD_2_DEG(2 * acos(q->w));
<a name="l00299"></a>00299 *x = q->x;
<a name="l00300"></a>00300 *y = q->y;
<a name="l00301"></a>00301 *z = q->z;
<a name="l00302"></a>00302
<a name="l00303"></a>00303 <span class="keywordflow">return</span>;
<a name="l00304"></a>00304 }
<a name="l00305"></a>00305
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