src/oscontext.c

   1 #include <GL/oscontext.h>
   2 #include "zbuffer.h"
   3 #include "zgl.h"
   4 #include <GL/gl.h>
   5 #include <stdlib.h>
   6 #include <assert.h>
   7
   8 static int buffercnt = 0;
   9
  10         ostgl_context *
  11 ostgl_create_context(const int xsize,
  12                 const int ysize,
  13                 const int depth,
  14                 void **framebuffers,
  15                 const int numbuffers)
  16 {
  17         ostgl_context *context;
  18         int i;
  19         ZBuffer *zb;
  20
  21         assert(depth == 16); /* support for other depths must include bpp
  22                                 convertion */
  23         assert(numbuffers >= 1);
  24
  25         context = gl_malloc(sizeof(ostgl_context));
  26         assert(context);
  27         context->zbs = gl_malloc(sizeof(void*)*numbuffers);
  28         context->framebuffers = gl_malloc(sizeof(void*)*numbuffers);
  29
  30         assert(context->zbs != NULL && context->framebuffers != NULL);
  31
  32         for (i = 0; i < numbuffers; i++) {
  33                 context->framebuffers[i] = framebuffers[i];
  34                 zb = ZB_open(xsize, ysize, ZB_MODE_5R6G5B, 0, NULL, NULL, framebuffers[i]);
  35                 if (zb == NULL) {
  36                         fprintf(stderr, "Error while initializing Z buffer\n");
  37                         exit(1);
  38                 }
  39                 context->zbs[i] = zb;
  40         }
  41         if (++buffercnt == 1) {
  42                 glInit(context->zbs[0]);
  43         }
  44         context->xsize = xsize;
  45         context->ysize = ysize;
  46         context->numbuffers = numbuffers;
  47         return context;
  48 }
  49
  50         void
  51 ostgl_delete_context(ostgl_context *context)
  52 {
  53         int i;
  54         for (i = 0; i < context->numbuffers; i++) {
  55                 ZB_close(context->zbs[i]);
  56         }
  57         gl_free(context->zbs);
  58         gl_free(context->framebuffers);
  59         gl_free(context);
  60
  61         if (--buffercnt == 0) {
  62                 glClose();
  63         }
  64 }
  65
  66         void
  67 ostgl_make_current(ostgl_context *oscontext, const int idx)
  68 {
  69         GLContext *context = gl_get_context();
  70         assert(idx < oscontext->numbuffers);
  71         context->zb = oscontext->zbs[idx];
  72 }
  73
  74         void
  75 ostgl_resize(ostgl_context *context,
  76                 const int xsize,
  77                 const int ysize,
  78                 void **framebuffers)
  79 {
  80         int i;
  81         for (i = 0; i < context->numbuffers; i++) {
  82                 ZB_resize(context->zbs[i], framebuffers[i], xsize, ysize);
  83         }
  84 }