src/get.c

   1 #include "zgl.h"
   2
   3 void glGetIntegerv(int pname,int *params)
   4 {
   5         GLContext *c=gl_get_context();
   6
   7         switch(pname) {
   8                 case GL_VIEWPORT:
   9                         params[0]=c->viewport.xmin;
  10                         params[1]=c->viewport.ymin;
  11                         params[2]=c->viewport.xsize;
  12                         params[3]=c->viewport.ysize;
  13                         break;
  14                 case GL_MAX_MODELVIEW_STACK_DEPTH:
  15                         *params = MAX_MODELVIEW_STACK_DEPTH;
  16                         break;
  17                 case GL_MAX_PROJECTION_STACK_DEPTH:
  18                         *params = MAX_PROJECTION_STACK_DEPTH;
  19                         break;
  20                 case GL_MAX_LIGHTS:
  21                         *params = MAX_LIGHTS;
  22                         break;
  23                 case GL_MAX_TEXTURE_SIZE:
  24                         *params = 256; /* not completely true, but... */
  25                         break;
  26                 case GL_MAX_TEXTURE_STACK_DEPTH:
  27                         *params = MAX_TEXTURE_STACK_DEPTH;
  28                         break;
  29                 default:
  30                         gl_fatal_error("glGet: option not implemented");
  31                         break;
  32         }
  33 }
  34
  35 void glGetFloatv(int pname, float *v)
  36 {
  37         int i;
  38         int mnr = 0; /* just a trick to return the correct matrix */
  39         GLContext *c = gl_get_context();
  40         switch (pname) {
  41                 case GL_TEXTURE_MATRIX:
  42                         mnr++;
  43                 case GL_PROJECTION_MATRIX:
  44                         mnr++;
  45                 case GL_MODELVIEW_MATRIX:
  46                         {
  47                                 float *p = &c->matrix_stack_ptr[mnr]->m[0][0];;
  48                                 for (i = 0; i < 4; i++) {
  49                                         *v++ = p[0];
  50                                         *v++ = p[4];
  51                                         *v++ = p[8];
  52                                         *v++ = p[12];
  53                                         p++;
  54                                 }
  55                         }
  56                         break;
  57                 case GL_LINE_WIDTH:
  58                         *v = 1.0f;
  59                         break;
  60                 case GL_LINE_WIDTH_RANGE:
  61                         v[0] = v[1] = 1.0f;
  62                         break;
  63                 case GL_POINT_SIZE:
  64                         *v = 1.0f;
  65                         break;
  66                 case GL_POINT_SIZE_RANGE:
  67                         v[0] = v[1] = 1.0f;
  68                 default:
  69                         fprintf(stderr,"warning: unknown pname in glGetFloatv()\n");
  70                         break;
  71         }
  72 }