1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
#include <stdio.h>
#include <stdlib.h>
#include <OpenGL/OpenGL.h>
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#include <OpenGL/glext.h>
#include <ApplicationServices/ApplicationServices.h>
#include "capabilities.h"
//#define DIAGNOSTIC 0
static void handleBufferModes(struct glCapabilities *cap, GLint bufferModes) {
if(bufferModes & kCGLStereoscopicBit) {
cap->stereo = true;
}
if(bufferModes & kCGLDoubleBufferBit) {
cap->buffers = 2;
} else {
cap->buffers = 1;
}
}
static void initCapabilities(struct glCapabilities *cap) {
cap->stereo = cap->buffers = cap->aux_buffers = 0;
}
enum {
MAX_DISPLAYS = 32
};
/*Return true if an error occured. */
bool getGlCapabilities(struct glCapabilities *cap) {
CGDirectDisplayID dspys[MAX_DISPLAYS];
CGDisplayErr err;
CGOpenGLDisplayMask displayMask;
CGDisplayCount i, displayCount = 0;
initCapabilities(cap);
err = CGGetActiveDisplayList(MAX_DISPLAYS, dspys, &displayCount);
if(err) {
#ifdef DIAGNOSTIC
fprintf(stderr, "CGGetActiveDisplayList %s\n", CGLErrorString (err));
#endif
return true;
}
for(i = 0; i < displayCount; ++i) {
displayMask = CGDisplayIDToOpenGLDisplayMask(dspys[i]);
CGLRendererInfoObj info;
GLint numRenderers = 0, r, accelerated = 0, flags = 0, aux = 0;
err = CGLQueryRendererInfo (displayMask, &info, &numRenderers);
if(!err) {
CGLDescribeRenderer (info, 0, kCGLRPRendererCount, &numRenderers);
for(r = 0; r < numRenderers; ++r) {
// find accelerated renderer (assume only one)
CGLDescribeRenderer (info, r, kCGLRPAccelerated, &accelerated);
if(accelerated) {
err = CGLDescribeRenderer(info, r, kCGLRPBufferModes, &flags);
if(err) {
CGLDestroyRendererInfo(info);
return true;
}
handleBufferModes(cap, flags);
err = CGLDescribeRenderer(info, r, kCGLRPMaxAuxBuffers, &aux);
if(err) {
CGLDestroyRendererInfo(info);
return true;
}
cap->aux_buffers = aux;
}
}
CGLDestroyRendererInfo(info);
}
}
/* No error occured. We are done. */
return false;
}
|
