get.c

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#include "zgl.h"
 
void glGetIntegerv(int pname,int *params)
{
  GLContext *c=gl_get_context();
 
  switch(pname) {
  case GL_VIEWPORT:
    params[0]=c->viewport.xmin;
    params[1]=c->viewport.ymin;
    params[2]=c->viewport.xsize;
    params[3]=c->viewport.ysize;
    break;
  case GL_MAX_MODELVIEW_STACK_DEPTH:
    *params = MAX_MODELVIEW_STACK_DEPTH;
    break;
  case GL_MAX_PROJECTION_STACK_DEPTH:
    *params = MAX_PROJECTION_STACK_DEPTH;
    break;
  case GL_MAX_LIGHTS:
    *params = MAX_LIGHTS;
    break;
  case GL_MAX_TEXTURE_SIZE:
    *params = 256; /* not completely true, but... */
    break;
  case GL_MAX_TEXTURE_STACK_DEPTH:
    *params = MAX_TEXTURE_STACK_DEPTH;
    break;
  default:
    gl_fatal_error("glGet: option not implemented");
    break;
  }
}
 
void glGetFloatv(int pname, float *v)
{
  int i;
  int mnr = 0; /* just a trick to return the correct matrix */
  GLContext *c = gl_get_context();
  switch (pname) {
  case GL_TEXTURE_MATRIX:
    mnr++; 
  case GL_PROJECTION_MATRIX:
    mnr++; 
  case GL_MODELVIEW_MATRIX:
    {
      float *p = &c->matrix_stack_ptr[mnr]->m[0][0];;
      for (i = 0; i < 4; i++) {
        *v++ = p[0];
        *v++ = p[4];
        *v++ = p[8];
        *v++ = p[12];
        p++;
      }
    } 
    break;
  case GL_LINE_WIDTH:
    *v = 1.0f;
    break;
  case GL_LINE_WIDTH_RANGE:
    v[0] = v[1] = 1.0f;
    break;
  case GL_POINT_SIZE:
    *v = 1.0f;
    break;
  case GL_POINT_SIZE_RANGE:
    v[0] = v[1] = 1.0f;
  default:
    fprintf(stderr,"warning: unknown pname in glGetFloatv()\n");
    break;
  }
}