apple_visual.c revision ad503c41557606d15b0420c824369456f6d20a8f 
1/*
2 Copyright (c) 2008, 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 <stdio.h>
32#include <stdlib.h>
33#include <assert.h>
34#include <GL/gl.h>
35#include <OpenGL/OpenGL.h>
36#include <OpenGL/CGLContext.h>
37#include <OpenGL/CGLRenderers.h>
38#include "apple_cgl.h"
39#include "apple_visual.h"
40#include "apple_glx.h"
41#include "glcontextmodes.h"
42
43enum
44{
45   MAX_ATTR = 60
46};
47
48/*mode is a __GlcontextModes*/
49void
50apple_visual_create_pfobj(CGLPixelFormatObj * pfobj, const void *mode,
51                          bool * double_buffered, bool * uses_stereo,
52                          bool offscreen)
53{
54   CGLPixelFormatAttribute attr[MAX_ATTR];
55   const __GLcontextModes *c = mode;
56   int numattr = 0;
57   GLint vsref = 0;
58   CGLError error = 0;
59
60   if (offscreen) {
61      apple_glx_diagnostic
62         ("offscreen rendering enabled.  Using kCGLPFAOffScreen\n");
63
64      attr[numattr++] = kCGLPFAOffScreen;
65      attr[numattr++] = kCGLPFAColorSize;
66      attr[numattr++] = 32;
67   }
68   else if (getenv("LIBGL_ALWAYS_SOFTWARE") != NULL) {
69      apple_glx_diagnostic
70         ("Software rendering requested.  Using kCGLRendererGenericFloatID.\n");
71      attr[numattr++] = kCGLPFARendererID;
72      attr[numattr++] = kCGLRendererGenericFloatID;
73   }
74   else if (getenv("LIBGL_ALLOW_SOFTWARE") != NULL) {
75      apple_glx_diagnostic
76         ("Software rendering is not being excluded.  Not using kCGLPFAAccelerated.\n");
77   }
78   else {
79      attr[numattr++] = kCGLPFAAccelerated;
80   }
81
82   /*
83    * The program chose a config based on the fbconfigs or visuals.
84    * Those are based on the attributes from CGL, so we probably
85    * do want the closest match for the color, depth, and accum.
86    */
87   attr[numattr++] = kCGLPFAClosestPolicy;
88
89   if (c->stereoMode) {
90      attr[numattr++] = kCGLPFAStereo;
91      *uses_stereo = true;
92   }
93   else {
94      *uses_stereo = false;
95   }
96
97   if (c->doubleBufferMode) {
98      attr[numattr++] = kCGLPFADoubleBuffer;
99      *double_buffered = true;
100   }
101   else {
102      *double_buffered = false;
103   }
104
105   attr[numattr++] = kCGLPFAColorSize;
106   attr[numattr++] = c->redBits + c->greenBits + c->blueBits;
107   attr[numattr++] = kCGLPFAAlphaSize;
108   attr[numattr++] = c->alphaBits;
109
110   if ((c->accumRedBits + c->accumGreenBits + c->accumBlueBits) > 0) {
111      attr[numattr++] = kCGLPFAAccumSize;
112      attr[numattr++] = c->accumRedBits + c->accumGreenBits +
113         c->accumBlueBits + c->accumAlphaBits;
114   }
115
116   if (c->depthBits > 0) {
117      attr[numattr++] = kCGLPFADepthSize;
118      attr[numattr++] = c->depthBits;
119   }
120
121   if (c->stencilBits > 0) {
122      attr[numattr++] = kCGLPFAStencilSize;
123      attr[numattr++] = c->stencilBits;
124   }
125
126   if (c->sampleBuffers > 0) {
127      attr[numattr++] = kCGLPFAMultisample;
128      attr[numattr++] = kCGLPFASampleBuffers;
129      attr[numattr++] = c->sampleBuffers;
130      attr[numattr++] = kCGLPFASamples;
131      attr[numattr++] = c->samples;
132   }
133
134   attr[numattr++] = 0;
135
136   assert(numattr < MAX_ATTR);
137
138   error = apple_cgl.choose_pixel_format(attr, pfobj, &vsref);
139
140   if (error) {
141      fprintf(stderr, "error: %s\n", apple_cgl.error_string(error));
142      abort();
143   }
144}
145