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# math.c

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    00001 /* This code is (C) AllegroGL contributors, and double licensed under
    00002  * the GPL and zlib licenses. See gpl.txt or zlib.txt for details.
    00003  */
    00015 #include <math.h>
    00016 #include <allegro.h>
    00017 #include "alleggl.h"
    00018 #include "allglint.h"
    00019
    00020
    00021 #ifndef M_PI
    00022    #define M_PI   3.14159265358979323846
    00023 #endif
    00024
    00025
    00026 #define ALGL_NOCONV(x) x
    00027
    00028 #define TRANSLATE_AL_TO_GL(al_type, gl_type, convertor) \
    00029     void allegro_gl_##al_type##_to_##gl_type (al_type *m, gl_type gl[16]) \
    00030     { \
    00031         int col, row; \
    00032         for (col = 0; col < 3; col++) \
    00033             for (row = 0; row < 3; row++) \
    00034                 gl[col*4+row] = convertor (m->v[col][row]); \
    00035         for (row = 0; row < 3; row++) \
    00036             gl[12+row] = convertor (m->t[row]); \
    00037         for (col = 0; col < 3; col++) \
    00038             gl[4*col + 3] = 0; \
    00039         gl[15] = 1; \
    00040     }
    00041
    00042
    00043
    00066 TRANSLATE_AL_TO_GL(MATRIX, GLfloat, fixtof)
    00067
    00068
    00069
    00070
    00082 TRANSLATE_AL_TO_GL(MATRIX, GLdouble, fixtof)
    00083
    00084
    00085
    00098 TRANSLATE_AL_TO_GL(MATRIX_f, GLfloat, ALGL_NOCONV)
    00099
    00100
    00101
    00114 TRANSLATE_AL_TO_GL(MATRIX_f, GLdouble, ALGL_NOCONV)
    00115
    00116
    00117
    00118 #define TRANSLATE_GL_TO_AL(gl_type, al_type, convertor) \
    00119     void allegro_gl_##gl_type##_to_##al_type (gl_type gl[16], al_type *m) \
    00120     { \
    00121         int col, row; \
    00122         for (col = 0; col < 3; col++) \
    00123             for (row = 0; row < 3; row++) \
    00124                 m->v[col][row] = convertor (gl[col*4+row]); \
    00125         for (row = 0; row < 3; row++) \
    00126             m->t[row] = convertor (gl[12+row]); \
    00127     }
    00128
    00129
    00130
    00143 TRANSLATE_GL_TO_AL(GLfloat, MATRIX, ftofix)
    00144
    00145
    00146
    00147
    00159 TRANSLATE_GL_TO_AL(GLdouble, MATRIX, ftofix)
    00160
    00161
    00162
    00175 TRANSLATE_GL_TO_AL(GLfloat, MATRIX_f, ALGL_NOCONV)
    00176
    00177
    00178
    00192 TRANSLATE_GL_TO_AL(GLdouble, MATRIX_f, ALGL_NOCONV)
    00193
    00194
    00195 #undef ALGL_NOCONV
    00196
    00197
    00198 #ifndef RAD_2_DEG
    00199     #define RAD_2_DEG(a) ((a) * 180 / M_PI)
    00200 #endif
    00201
    00202
    00203
    00204 /* void allegro_gl_apply_quat(QUAT *q) */
    00222 void allegro_gl_apply_quat(QUAT *q) {
    00223
    00224     float theta;
    00225     ASSERT(q);
    00226     ASSERT(__allegro_gl_valid_context);
    00227
    00228     theta = RAD_2_DEG(2 * acos(q->w));
    00229     if (q->w < 1.0f && q->w > -1.0f)
    00230         glRotatef(theta, q->x, q->y, q->z);
    00231
    00232     return;
    00233 }
    00234
    00235
    00236
    00237 /* void allegro_gl_quat_to_glrotatef(QUAT *q, float *angle, float *x, float *y, float *z) */
    00258 void allegro_gl_quat_to_glrotatef(QUAT *q, float *angle, float *x, float *y, float *z) {
    00259
    00260     ASSERT(q);
    00261     ASSERT(angle);
    00262     ASSERT(x);
    00263     ASSERT(y);
    00264     ASSERT(z);
    00265
    00266     *angle = RAD_2_DEG(2 * acos(q->w));
    00267     *x = q->x;
    00268     *y = q->y;
    00269     *z = q->z;
    00270
    00271     return;
    00272 }
    00273
    00274
    00275
    00276 /* void allegro_gl_quat_to_glrotated(QUAT *q, double *angle, double *x, double *y, double *z) */
    00290 void allegro_gl_quat_to_glrotated(QUAT *q, double *angle, double *x, double *y, double *z) {
    00291
    00292     ASSERT(q);
    00293     ASSERT(angle);
    00294     ASSERT(x);
    00295     ASSERT(y);
    00296     ASSERT(z);
    00297
    00298     *angle = RAD_2_DEG(2 * acos(q->w));
    00299     *x = q->x;
    00300     *y = q->y;
    00301     *z = q->z;
    00302
    00303     return;
    00304 }
    00305