src/glx/apple/apple_xgl_api_stereo.c

   1 /*
   2  Copyright (c) 2009 Apple Inc.
   3
   4  Permission is hereby granted, free of charge, to any person
   5  obtaining a copy of this software and associated documentation files
   6  (the "Software"), to deal in the Software without restriction,
   7  including without limitation the rights to use, copy, modify, merge,
   8  publish, distribute, sublicense, and/or sell copies of the Software,
   9  and to permit persons to whom the Software is furnished to do so,
  10  subject to the following conditions:
  11
  12  The above copyright notice and this permission notice shall be
  13  included in all copies or substantial portions of the Software.
  14
  15  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  NONINFRINGEMENT.  IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT
  19  HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  20  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  DEALINGS IN THE SOFTWARE.
  23
  24  Except as contained in this notice, the name(s) of the above
  25  copyright holders shall not be used in advertising or otherwise to
  26  promote the sale, use or other dealings in this Software without
  27  prior written authorization.
  28 */
  29
  30 #include <stdbool.h>
  31 #include "apple_xgl_api_stereo.h"
  32 #include "apple_xgl_api.h"
  33 #include "apple_glx_context.h"
  34
  35 extern struct apple_xgl_api __gl_api;
  36 /*
  37  * These are special functions for stereoscopic support
  38  * differences in MacOS X.
  39  */
  40 void
  41 glDrawBuffer(GLenum mode)
  42 {
  43    GLXContext gc = glXGetCurrentContext();
  44
  45    if (gc && apple_glx_context_uses_stereo(gc->driContext)) {
  46       GLenum buf[2];
  47       GLsizei n = 0;
  48
  49       switch (mode) {
  50       case GL_BACK:
  51          buf[0] = GL_BACK_LEFT;
  52          buf[1] = GL_BACK_RIGHT;
  53          n = 2;
  54          break;
  55       case GL_FRONT:
  56          buf[0] = GL_FRONT_LEFT;
  57          buf[1] = GL_FRONT_RIGHT;
  58          n = 2;
  59          break;
  60
  61       default:
  62          buf[0] = mode;
  63          n = 1;
  64          break;
  65       }
  66
  67       __gl_api.DrawBuffers(n, buf);
  68    }
  69    else {
  70       __gl_api.DrawBuffer(mode);
  71    }
  72 }
  73
  74
  75 void
  76 glDrawBuffers(GLsizei n, const GLenum * bufs)
  77 {
  78    GLXContext gc = glXGetCurrentContext();
  79
  80    if (gc && apple_glx_context_uses_stereo(gc->driContext)) {
  81       GLenum newbuf[n + 2];
  82       GLsizei i, outi = 0;
  83       bool have_back = false;
  84       bool have_front = false;
  85
  86       for (i = 0; i < n; ++i) {
  87          if (GL_BACK == bufs[i]) {
  88             have_back = true;
  89          }
  90          else if (GL_FRONT == bufs[i]) {
  91             have_back = true;
  92          }
  93          else {
  94             newbuf[outi++] = bufs[i];
  95          }
  96       }
  97
  98       if (have_back) {
  99          newbuf[outi++] = GL_BACK_LEFT;
 100          newbuf[outi++] = GL_BACK_RIGHT;
 101       }
 102
 103       if (have_front) {
 104          newbuf[outi++] = GL_FRONT_LEFT;
 105          newbuf[outi++] = GL_FRONT_RIGHT;
 106       }
 107
 108       __gl_api.DrawBuffers(outi, newbuf);
 109    }
 110    else {
 111       __gl_api.DrawBuffers(n, bufs);
 112    }
 113 }
 114
 115 void
 116 glDrawBuffersARB(GLsizei n, const GLenum * bufs)
 117 {
 118    glDrawBuffers(n, bufs);
 119 }