mirror of
https://github.com/TomHarte/CLK.git
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154 lines
3.9 KiB
Objective-C
154 lines
3.9 KiB
Objective-C
//
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// CSOpenGLView
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// CLK
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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 "CSOpenGLView.h"
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@import CoreVideo;
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@import GLKit;
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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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// set the clear colour
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[self.openGLContext makeCurrentContext];
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glClearColor(0.0, 0.0, 0.0, 1.0);
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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 *const view = (__bridge CSOpenGLView *)displayLinkContext;
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[view drawAtTime:now frequency:CVDisplayLinkGetActualOutputVideoRefreshPeriod(displayLink)];
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return kCVReturnSuccess;
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}
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- (void)drawAtTime:(const CVTimeStamp *)now frequency:(double)frequency
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{
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// Draw the display now regardless of other activity.
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[self drawViewOnlyIfDirty:YES];
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}
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- (void)invalidate
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{
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CVDisplayLinkStop(_displayLink);
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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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- (CGSize)backingSize
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{
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return [self convertSizeToBacking:self.bounds.size];
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}
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- (void)reshape
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{
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[super reshape];
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[self performWithGLContext:^{
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CGSize viewSize = [self backingSize];
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glViewport(0, 0, (GLsizei)viewSize.width, (GLsizei)viewSize.height);
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}];
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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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NSOpenGLPFAMultisample,
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NSOpenGLPFASampleBuffers, 1,
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NSOpenGLPFASamples, 2,
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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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- (void)drawRect:(NSRect)dirtyRect
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{
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[self drawViewOnlyIfDirty:NO];
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}
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- (void)drawViewOnlyIfDirty:(BOOL)onlyIfDirty
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{
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[self performWithGLContext:^{
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[self.delegate openGLView:self drawViewOnlyIfDirty:onlyIfDirty];
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CGLFlushDrawable([[self openGLContext] CGLContextObj]);
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}];
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}
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- (void)performWithGLContext:(dispatch_block_t)action
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{
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CGLLockContext([[self openGLContext] CGLContextObj]);
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[self.openGLContext makeCurrentContext];
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action();
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CGLUnlockContext([[self openGLContext] CGLContextObj]);
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}
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#pragma mark - NSResponder
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- (BOOL)acceptsFirstResponder
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{
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return YES;
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}
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- (void)keyDown:(NSEvent *)theEvent
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{
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[self.responderDelegate keyDown:theEvent];
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}
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- (void)keyUp:(NSEvent *)theEvent
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{
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[self.responderDelegate keyUp:theEvent];
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}
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- (void)flagsChanged:(NSEvent *)theEvent
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{
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[self.responderDelegate flagsChanged:theEvent];
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}
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@end
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