109 lines
3.3 KiB
C
109 lines
3.3 KiB
C
/*
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* Copyright (c) 2008 Apple Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <OpenGL/OpenGL.h>
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#include <OpenGL/gl.h>
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#include <OpenGL/glu.h>
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#include <OpenGL/glext.h>
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#include <ApplicationServices/ApplicationServices.h>
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#include "capabilities.h"
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//#define DIAGNOSTIC 0
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static void handleBufferModes(struct glCapabilities *cap, GLint bufferModes) {
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if(bufferModes & kCGLStereoscopicBit) {
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cap->stereo = true;
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}
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if(bufferModes & kCGLDoubleBufferBit) {
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cap->buffers = 2;
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} else {
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cap->buffers = 1;
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}
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}
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static void initCapabilities(struct glCapabilities *cap) {
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cap->stereo = cap->buffers = cap->aux_buffers = 0;
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}
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enum {
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MAX_DISPLAYS = 32
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};
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/*Return true if an error occured. */
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bool getGlCapabilities(struct glCapabilities *cap) {
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CGDirectDisplayID dspys[MAX_DISPLAYS];
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CGDisplayErr err;
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CGOpenGLDisplayMask displayMask;
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CGDisplayCount i, displayCount = 0;
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initCapabilities(cap);
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err = CGGetActiveDisplayList(MAX_DISPLAYS, dspys, &displayCount);
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if(err) {
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#ifdef DIAGNOSTIC
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fprintf(stderr, "CGGetActiveDisplayList %s\n", CGLErrorString (err));
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#endif
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return true;
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}
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for(i = 0; i < displayCount; ++i) {
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displayMask = CGDisplayIDToOpenGLDisplayMask(dspys[i]);
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CGLRendererInfoObj info;
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GLint numRenderers = 0, r, accelerated = 0, flags = 0, aux = 0;
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err = CGLQueryRendererInfo (displayMask, &info, &numRenderers);
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if(!err) {
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CGLDescribeRenderer (info, 0, kCGLRPRendererCount, &numRenderers);
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for(r = 0; r < numRenderers; ++r) {
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// find accelerated renderer (assume only one)
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CGLDescribeRenderer (info, r, kCGLRPAccelerated, &accelerated);
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if(accelerated) {
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err = CGLDescribeRenderer(info, r, kCGLRPBufferModes, &flags);
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if(err) {
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CGLDestroyRendererInfo(info);
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return true;
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}
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handleBufferModes(cap, flags);
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err = CGLDescribeRenderer(info, r, kCGLRPMaxAuxBuffers, &aux);
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if(err) {
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CGLDestroyRendererInfo(info);
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return true;
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}
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cap->aux_buffers = aux;
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}
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}
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CGLDestroyRendererInfo(info);
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}
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}
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/* No error occured. We are done. */
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return false;
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}
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