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51 lines
1.5 KiB
Objective-C
51 lines
1.5 KiB
Objective-C
//
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// OpenGLView.m
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// ElectrEm
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//
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// Created by Thomas Harte on 16/07/2015.
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// Copyright © 2015 Thomas Harte. All rights reserved.
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//
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#import "OpenGLView.h"
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@import CoreVideo;
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@implementation CSOpenGLView {
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CVDisplayLinkRef displayLink;
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}
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- (void)prepareOpenGL
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{
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// Synchronize buffer swaps with vertical refresh rate
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GLint swapInt = 1;
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[[self openGLContext] setValues:&swapInt forParameter:NSOpenGLCPSwapInterval];
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// Create a display link capable of being used with all active displays
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CVDisplayLinkCreateWithActiveCGDisplays(&displayLink);
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// Set the renderer output callback function
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CVDisplayLinkSetOutputCallback(displayLink, &MyDisplayLinkCallback, (__bridge void * __nullable)(self));
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// Set the display link for the current renderer
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CGLContextObj cglContext = [[self openGLContext] CGLContextObj];
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CGLPixelFormatObj cglPixelFormat = [[self pixelFormat] CGLPixelFormatObj];
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CVDisplayLinkSetCurrentCGDisplayFromOpenGLContext(displayLink, cglContext, cglPixelFormat);
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// Activate the display link
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CVDisplayLinkStart(displayLink);
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}
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static CVReturn MyDisplayLinkCallback(CVDisplayLinkRef displayLink, const CVTimeStamp* now, const CVTimeStamp* outputTime, CVOptionFlags flagsIn, CVOptionFlags* flagsOut, void* displayLinkContext)
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{
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CSOpenGLView *view = (__bridge CSOpenGLView *)displayLinkContext;
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[view.delegate openGLView:view didUpdateToTime:*now];
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return kCVReturnSuccess;
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}
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- (void)dealloc
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{
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// Release the display link
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CVDisplayLinkRelease(displayLink);
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}
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@end
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