How implementa antialiasing in Mac app using Metal? - macos

Question

I'm making an app for MacOS, but I'm having problems with the antialiasing implementation in Metal.
When compiling I get the following error:
validateAttachmentOnDevice:540: failed assertion
MTLRenderPassDescriptor render targets have inconsistent sample
counts.
This is the code I use to implement the textures:
- (void)makeTextures {
if ([depthTexture width] != drawableSize.width || [depthTexture height] != drawableSize.height)
{
MTLTextureDescriptor *colorDescriptor = [MTLTextureDescriptor new];
colorDescriptor.textureType = MTLTextureType2DMultisample;
colorDescriptor.sampleCount = 4;
colorDescriptor.pixelFormat = vista.colorPixelFormat;
colorDescriptor.width = drawableSize.width;
colorDescriptor.height = drawableSize.height;
colorDescriptor.usage = MTLTextureUsageRenderTarget;
colorDescriptor.storageMode = MTLStorageModePrivate;
msaaColorTexture = [view.device newTextureWithDescriptor:colorDescriptor];
MTLTextureDescriptor *resolveDescriptor = [MTLTextureDescriptor new];
resolveDescriptor.textureType = MTLTextureType2D;
resolveDescriptor.pixelFormat = vista.colorPixelFormat;
resolveDescriptor.width = drawableSize.width;
resolveDescriptor.height = drawableSize.height;
resolveDescriptor.storageMode = MTLStorageModePrivate;
msaaResolveColorTexture = [view.device newTextureWithDescriptor:resolveDescriptor];
MTLTextureDescriptor *desc = [MTLTextureDescriptor new];
desc.textureType = MTLTextureType2DMultisample;
desc.sampleCount = 4;
desc.pixelFormat = MTLPixelFormatDepth32Float;
desc.width = drawableSize.width;
desc.height = drawableSize.height;
desc.usage = MTLTextureUsageRenderTarget;
desc.storageMode = MTLStorageModePrivate;
depthTexture = [view.device newTextureWithDescriptor:desc];
}
}
If at the time of creating the MTLRenderPipelineDescriptor I add .samplecount = 4;, the error disappears, but nothing is drawing in the view.
This are de PipelineDescriptor creation:
MTLRenderPipelineDescriptor *pipelineStateDescriptor = [MTLRenderPipelineDescriptor new];
pipelineStateDescriptor.label = #"Simple Pipeline";
pipelineStateDescriptor.vertexFunction = vertexFunction;
pipelineStateDescriptor.fragmentFunction = fragmentFunction;
pipelineStateDescriptor.colorAttachments[0].pixelFormat = vista.colorPixelFormat;
pipelineStateDescriptor.depthAttachmentPixelFormat = MTLPixelFormatDepth32Float;
// No error but black view.
//pipelineStateDescriptor.sampleCount = 4;
NSError *error;
pipelineState = [view.device newRenderPipelineStateWithDescriptor:pipelineStateDescriptor error:&error];
// Depth stencil.
MTLDepthStencilDescriptor *depthStencilDescriptor = [MTLDepthStencilDescriptor new];
depthStencilDescriptor.depthCompareFunction = MTLCompareFunctionLess;
depthStencilDescriptor.depthWriteEnabled = YES;
depthStencilState = [view.device newDepthStencilStateWithDescriptor:depthStencilDescriptor];
And passDescriptor:
if (passDescriptor != nil) {
passDescriptor.colorAttachments[0].texture = msaaColorTexture;
passDescriptor.colorAttachments[0].resolveTexture = msaaResolveColorTexture;
passDescriptor.colorAttachments[0].clearColor = MTLClearColorMake(1.0f, 1.0f, 1.0f, 1.0f);
passDescriptor.colorAttachments[0].storeAction = MTLStoreActionMultisampleResolve;
passDescriptor.colorAttachments[0].loadAction = MTLLoadActionClear;
passDescriptor.depthAttachment.texture = depthTexture;
passDescriptor.depthAttachment.clearDepth = 1.0;
passDescriptor.depthAttachment.loadAction = MTLLoadActionClear;
passDescriptor.depthAttachment.storeAction = MTLStoreActionStore;