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Performed the bare necessary steps to get my little OpenGL view to create a CVDisplayLink and then repaint itself in time with the display.

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Thomas Harte 2015-07-16 21:16:21 -04:00
parent 1df2c48668
commit 4496493e85
2 changed files with 41 additions and 7 deletions
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13
OSBindings/Mac/Clock Signal/Base.lproj/Atari2600Document.xib
View File

@ -17,9 +17,20 @@
<rect key="contentRect" x="133" y="235" width="507" height="413"/> <rect key="contentRect" x="133" y="235" width="507" height="413"/>
<rect key="screenRect" x="0.0" y="0.0" width="2560" height="1417"/> <rect key="screenRect" x="0.0" y="0.0" width="2560" height="1417"/>
<value key="minSize" type="size" width="94" height="86"/> <value key="minSize" type="size" width="94" height="86"/>
<view key="contentView" id="gIp-Ho-8D9" customClass="CSOpenGLView"> <view key="contentView" id="gIp-Ho-8D9">
<rect key="frame" x="0.0" y="0.0" width="507" height="413"/> <rect key="frame" x="0.0" y="0.0" width="507" height="413"/>
<autoresizingMask key="autoresizingMask"/> <autoresizingMask key="autoresizingMask"/>
<subviews>
<openGLView useAuxiliaryDepthBufferStencil="NO" allowOffline="YES" wantsBestResolutionOpenGLSurface="YES" translatesAutoresizingMaskIntoConstraints="NO" id="DEG-fq-cjd" customClass="CSOpenGLView">
<rect key="frame" x="0.0" y="0.0" width="507" height="413"/>
</openGLView>
</subviews>
<constraints>
<constraint firstItem="DEG-fq-cjd" firstAttribute="centerX" secondItem="gIp-Ho-8D9" secondAttribute="centerX" id="ES5-nL-N3h"/>
<constraint firstItem="DEG-fq-cjd" firstAttribute="height" secondItem="gIp-Ho-8D9" secondAttribute="height" id="YoB-qI-LFX"/>
<constraint firstItem="DEG-fq-cjd" firstAttribute="centerY" secondItem="gIp-Ho-8D9" secondAttribute="centerY" id="d5Y-3a-CEI"/>
<constraint firstItem="DEG-fq-cjd" firstAttribute="width" secondItem="gIp-Ho-8D9" secondAttribute="width" id="mYS-bH-DST"/>
</constraints>
</view> </view>
<connections> <connections>
<outlet property="delegate" destination="-2" id="0bl-1N-x8E"/> <outlet property="delegate" destination="-2" id="0bl-1N-x8E"/>

35
OSBindings/Mac/Clock Signal/OpenGLView.m
View File

@ -13,15 +13,38 @@
CVDisplayLinkRef displayLink; CVDisplayLinkRef displayLink;
} }
- (instancetype)initWithCoder:(nonnull NSCoder *)coder - (void)prepareOpenGL
{ {
self = [super initWithCoder:coder]; // Synchronize buffer swaps with vertical refresh rate
GLint swapInt = 1;
[[self openGLContext] setValues:&swapInt forParameter:NSOpenGLCPSwapInterval];
if(self) // Create a display link capable of being used with all active displays
{ CVDisplayLinkCreateWithActiveCGDisplays(&displayLink);
}
// Set the renderer output callback function
CVDisplayLinkSetOutputCallback(displayLink, &MyDisplayLinkCallback, (__bridge void * __nullable)(self));
// Set the display link for the current renderer
CGLContextObj cglContext = [[self openGLContext] CGLContextObj];
CGLPixelFormatObj cglPixelFormat = [[self pixelFormat] CGLPixelFormatObj];
CVDisplayLinkSetCurrentCGDisplayFromOpenGLContext(displayLink, cglContext, cglPixelFormat);
// Activate the display link
CVDisplayLinkStart(displayLink);
}
return self; // This is the renderer output callback function
static CVReturn MyDisplayLinkCallback(CVDisplayLinkRef displayLink, const CVTimeStamp* now, const CVTimeStamp* outputTime, CVOptionFlags flagsIn, CVOptionFlags* flagsOut, void* displayLinkContext)
{
[(__bridge CSOpenGLView *)displayLinkContext setNeedsDisplay:YES];
return kCVReturnSuccess;
}
- (void)dealloc
{
// Release the display link
CVDisplayLinkRelease(displayLink);
} }
@end @end