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95 lines
2.7 KiB
Objective-C
95 lines
2.7 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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#import <OpenGL/gl.h>
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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, DisplayLinkCallback, (__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 DisplayLinkCallback(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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- (void)reshape
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{
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[super reshape];
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CGSize viewSize = [self convertSize:self.bounds.size toView:self];
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glViewport(0, 0, viewSize.width, viewSize.height);
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}
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- (void)drawRect:(NSRect)dirtyRect
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{
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[self.openGLContext makeCurrentContext];
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[self.delegate openGLViewDrawView:self];
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glSwapAPPLE();
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}
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- (void) awakeFromNib
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{
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NSOpenGLPixelFormatAttribute attributes[] =
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{
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NSOpenGLPFADoubleBuffer,
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NSOpenGLPFAOpenGLProfile, NSOpenGLProfileVersion3_2Core,
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0
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};
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NSOpenGLPixelFormat *pixelFormat = [[NSOpenGLPixelFormat alloc] initWithAttributes:attributes];
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NSOpenGLContext *context = [[NSOpenGLContext alloc] initWithFormat:pixelFormat shareContext:nil];
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#ifdef DEBUG
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// When we're using a CoreProfile context, crash if we call a legacy OpenGL function
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// This will make it much more obvious where and when such a function call is made so
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// that we can remove such calls.
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// Without this we'd simply get GL_INVALID_OPERATION error for calling legacy functions
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// but it would be more difficult to see where that function was called.
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CGLEnable([context CGLContextObj], kCGLCECrashOnRemovedFunctions);
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#endif
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self.pixelFormat = pixelFormat;
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self.openGLContext = context;
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self.wantsBestResolutionOpenGLSurface = YES;
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}
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@end
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