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
__applegl_glDrawBuffer(GLenum mode)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
__applegl_glDrawBuffersARB(GLsizei n,const GLenum * bufs)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