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Reorder stencil and framebuffer creation.

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This commit is contained in:
Thomas Harte
2026-02-22 15:57:38 -05:00
parent c32ace0244
commit 01b1d74ca7
1 changed files with 19 additions and 18 deletions
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37
OSBindings/Mac/Clock Signal/ScanTarget/CSScanTarget.mm
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@@ -390,7 +390,25 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
const NSUInteger frameBufferWidth = MIN(NSUInteger(size.width) * (_isUsingSupersampling ? 2 : 1), 16384);
const NSUInteger frameBufferHeight = MIN(NSUInteger(size.height) * (_isUsingSupersampling ? 2 : 1), 16384);
// Generate a framebuffer and a stencil.
// Generate stencil.
MTLTextureDescriptor *const stencilTextureDescriptor = [MTLTextureDescriptor
texture2DDescriptorWithPixelFormat:MTLPixelFormatStencil8
width:frameBufferWidth
height:frameBufferHeight
mipmapped:NO];
stencilTextureDescriptor.usage = MTLTextureUsageRenderTarget;
stencilTextureDescriptor.resourceOptions = MTLResourceStorageModePrivate;
_frameBufferStencil = [_view.device newTextureWithDescriptor:stencilTextureDescriptor];
// Establish intended stencil useage; it's only to track which pixels haven't been painted
// at all at the end of every frame. So: always paint, and replace the stored stencil value
// (which is seeded as 0) with the nominated one (a 1).
MTLDepthStencilDescriptor *depthStencilDescriptor = [[MTLDepthStencilDescriptor alloc] init];
depthStencilDescriptor.frontFaceStencil.stencilCompareFunction = MTLCompareFunctionAlways;
depthStencilDescriptor.frontFaceStencil.depthStencilPassOperation = MTLStencilOperationReplace;
_drawStencilState = [_view.device newDepthStencilStateWithDescriptor:depthStencilDescriptor];
// Generate framebuffer.
MTLTextureDescriptor *const textureDescriptor = [MTLTextureDescriptor
texture2DDescriptorWithPixelFormat:_view.colorPixelFormat
width:frameBufferWidth
@@ -401,15 +419,6 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
id<MTLTexture> _oldFrameBuffer = _frameBuffer;
_frameBuffer = [_view.device newTextureWithDescriptor:textureDescriptor];
MTLTextureDescriptor *const stencilTextureDescriptor = [MTLTextureDescriptor
texture2DDescriptorWithPixelFormat:MTLPixelFormatStencil8
width:frameBufferWidth
height:frameBufferHeight
mipmapped:NO];
stencilTextureDescriptor.usage = MTLTextureUsageRenderTarget;
stencilTextureDescriptor.resourceOptions = MTLResourceStorageModePrivate;
_frameBufferStencil = [_view.device newTextureWithDescriptor:stencilTextureDescriptor];
// Generate a render pass with that framebuffer and stencil.
_frameBufferRenderPass = [[MTLRenderPassDescriptor alloc] init];
_frameBufferRenderPass.colorAttachments[0].texture = _frameBuffer;
@@ -421,14 +430,6 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
_frameBufferRenderPass.stencilAttachment.loadAction = MTLLoadActionLoad;
_frameBufferRenderPass.stencilAttachment.storeAction = MTLStoreActionStore;
// Establish intended stencil useage; it's only to track which pixels haven't been painted
// at all at the end of every frame. So: always paint, and replace the stored stencil value
// (which is seeded as 0) with the nominated one (a 1).
MTLDepthStencilDescriptor *depthStencilDescriptor = [[MTLDepthStencilDescriptor alloc] init];
depthStencilDescriptor.frontFaceStencil.stencilCompareFunction = MTLCompareFunctionAlways;
depthStencilDescriptor.frontFaceStencil.depthStencilPassOperation = MTLStencilOperationReplace;
_drawStencilState = [_view.device newDepthStencilStateWithDescriptor:depthStencilDescriptor];
// Draw from _oldFrameBuffer to _frameBuffer; otherwise clear the new framebuffer.
if(_oldFrameBuffer) {
[self copyTexture:_oldFrameBuffer to:_frameBuffer];