home *** CD-ROM | disk | FTP | other *** search
/ Aminet 51 / Aminet 51 (2002)(GTI - Schatztruhe)[!][Oct 2002].iso / Aminet / dev / c / TinyGL.lha / tinygl / src / select.c < prev    next >
Encoding:
C/C++ Source or Header  |  2000-10-15  |  2.2 KB  |  115 lines
  1. #include "zgl.h"
  2.  
  3. int glRenderMode(int mode)
  4. {
  5.   GLContext *c=gl_get_context();
  6.   int result=0;
  7.   
  8.   switch(c->render_mode) {
  9.   case GL_RENDER:
  10.     break;
  11.   case GL_SELECT:
  12.     if (c->select_overflow) {
  13.       result=-c->select_hits;
  14.     } else {
  15.       result=c->select_hits;
  16.     }
  17.     c->select_overflow=0;
  18.     c->select_ptr=c->select_buffer;
  19.     c->name_stack_size=0;
  20.     break;
  21.   default:
  22.     assert(0);
  23.   }
  24.   switch(mode) {
  25.   case GL_RENDER:
  26.     c->render_mode=GL_RENDER;
  27.     break;
  28.   case GL_SELECT:
  29.     c->render_mode=GL_SELECT;
  30.     assert( c->select_buffer != NULL);
  31.     c->select_ptr=c->select_buffer;
  32.     c->select_hits=0;
  33.     c->select_overflow=0;
  34.     c->select_hit=NULL;
  35.     break;
  36.   default:
  37.     assert(0);
  38.   }
  39.   return result;
  40. }
  41.  
  42. void glSelectBuffer(int size,unsigned int *buf)
  43. {
  44.   GLContext *c=gl_get_context();
  45.  
  46.   assert(c->render_mode != GL_SELECT);
  47.   
  48.   c->select_buffer=buf;
  49.   c->select_size=size;
  50. }
  51.  
  52.  
  53. void glopInitNames(GLContext *c,GLParam *p)
  54. {
  55.   if (c->render_mode == GL_SELECT) {
  56.     c->name_stack_size=0;
  57.     c->select_hit=NULL;
  58.   }
  59. }
  60.  
  61. void glopPushName(GLContext *c,GLParam *p)
  62. {
  63.   if (c->render_mode == GL_SELECT) {
  64.     assert(c->name_stack_size<MAX_NAME_STACK_DEPTH);
  65.     c->name_stack[c->name_stack_size++]=p[1].i;
  66.     c->select_hit=NULL;
  67.   }
  68. }
  69.  
  70. void glopPopName(GLContext *c,GLParam *p)
  71. {
  72.   if (c->render_mode == GL_SELECT) {
  73.     assert(c->name_stack_size>0);
  74.     c->name_stack_size--;
  75.     c->select_hit=NULL;
  76.   }
  77. }
  78.  
  79. void glopLoadName(GLContext *c,GLParam *p)
  80. {
  81.   if (c->render_mode == GL_SELECT) {
  82.    assert(c->name_stack_size>0);
  83.    c->name_stack[c->name_stack_size-1]=p[1].i;
  84.    c->select_hit=NULL;
  85.   }
  86. }
  87.  
  88. void gl_add_select(GLContext *c,unsigned int zmin,unsigned int zmax)
  89. {
  90.   unsigned int *ptr;
  91.   int n,i;
  92.  
  93.   if (!c->select_overflow) {
  94.     if (c->select_hit==NULL) {
  95.       n=c->name_stack_size;
  96.       if ((c->select_ptr-c->select_buffer+3+n) > 
  97.       c->select_size) {
  98.     c->select_overflow=1;
  99.       } else {
  100.     ptr=c->select_ptr;
  101.     c->select_hit=ptr;
  102.     *ptr++=c->name_stack_size;
  103.     *ptr++=zmin;
  104.     *ptr++=zmax;
  105.     for(i=0;i<n;i++) *ptr++=c->name_stack[i];
  106.     c->select_ptr=ptr;
  107.     c->select_hits++;
  108.       }
  109.     } else {
  110.       if (zmin<c->select_hit[1]) c->select_hit[1]=zmin;
  111.       if (zmax>c->select_hit[2]) c->select_hit[2]=zmax;
  112.     }
  113.   }
  114. }
  115.