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      1 /*
      2  Copyright (c) 2009-2011 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 /* This should be removed once stereo hardware bugs are fixed
     31  * <rdar://problem/6729006>
     32  */
     33 
     34 #include <stdbool.h>
     35 
     36 #define GL_GLEXT_PROTOTYPES
     37 #include <GL/gl.h>
     38 #include <GL/glext.h>
     39 
     40 #include "glxclient.h"
     41 #include "apple_glx_context.h"
     42 #include "apple_xgl_api.h"
     43 #include "glapitable.h"
     44 
     45 extern struct _glapi_table * __ogl_framework_api;
     46 
     47 /*
     48  * These are special functions for stereoscopic support
     49  * differences in MacOS X.
     50  */
     51 void
     52 __applegl_glDrawBuffer(GLenum mode)
     53 {
     54    struct glx_context * gc = __glXGetCurrentContext();
     55 
     56    if (gc && apple_glx_context_uses_stereo(gc->driContext)) {
     57       GLenum buf[2];
     58       GLsizei n = 0;
     59 
     60       switch (mode) {
     61       case GL_BACK:
     62          buf[0] = GL_BACK_LEFT;
     63          buf[1] = GL_BACK_RIGHT;
     64          n = 2;
     65          break;
     66       case GL_FRONT:
     67          buf[0] = GL_FRONT_LEFT;
     68          buf[1] = GL_FRONT_RIGHT;
     69          n = 2;
     70          break;
     71 
     72       default:
     73          buf[0] = mode;
     74          n = 1;
     75          break;
     76       }
     77 
     78       __ogl_framework_api->DrawBuffersARB(n, buf);
     79    }
     80    else {
     81       __ogl_framework_api->DrawBuffer(mode);
     82    }
     83 }
     84 
     85 
     86 void
     87 __applegl_glDrawBuffersARB(GLsizei n, const GLenum * bufs)
     88 {
     89    struct glx_context * gc = __glXGetCurrentContext();
     90 
     91    if (gc && apple_glx_context_uses_stereo(gc->driContext)) {
     92       GLenum newbuf[n + 2];
     93       GLsizei i, outi = 0;
     94       bool have_back = false;
     95       bool have_front = false;
     96 
     97       for (i = 0; i < n; ++i) {
     98          if (GL_BACK == bufs[i]) {
     99             have_back = true;
    100          }
    101          else if (GL_FRONT == bufs[i]) {
    102             have_back = true;
    103          }
    104          else {
    105             newbuf[outi++] = bufs[i];
    106          }
    107       }
    108 
    109       if (have_back) {
    110          newbuf[outi++] = GL_BACK_LEFT;
    111          newbuf[outi++] = GL_BACK_RIGHT;
    112       }
    113 
    114       if (have_front) {
    115          newbuf[outi++] = GL_FRONT_LEFT;
    116          newbuf[outi++] = GL_FRONT_RIGHT;
    117       }
    118 
    119       __ogl_framework_api->DrawBuffersARB(outi, newbuf);
    120    }
    121    else {
    122       __ogl_framework_api->DrawBuffersARB(n, bufs);
    123    }
    124 }
    125