Explorez les jeux Metal 4

0:01 - Synchronize access to a buffer within an encoder

// Synchronize access to a buffer within an encoder

id<MTL4ComputeCommandEncoder> encoder = [commandBuffer computeCommandEncoder];

[encoder copyFromBuffer:src sourceOffset:0 toBuffer:buffer1 destinationOffset:0 size:64];

[encoder barrierAfterEncoderStages:MTLStageBlit 
               beforeEncoderStages:MTLStageDispatch
                 visibilityOptions:MTL4VisibilityOptionDevice];

[encoder setComputePipelineState:pso];

[argTable setAddress:buffer1.gpuAddress atIndex:0];
[encoder setArgumentTable:argTable];
[encoder dispatchThreads:threadsPerGrid threadsPerThreadgroup:threadsPerThreadgroup];

[encoder endEncoding];code snippet.

4:29 - Configure superset of color attachments

// Configure superset of color attachments

MTL4RenderPassDescriptor *desc = [MTLRenderPassDescriptor renderPassDescriptor];

desc.supportColorAttachmentMapping = YES;

desc.colorAttachments[0].texture = colortex0;
desc.colorAttachments[1].texture = colortex1;
desc.colorAttachments[2].texture = colortex2;
desc.colorAttachments[3].texture = colortex3;
desc.colorAttachments[4].texture = colortex4;

4:38 - Set color attachment map entries

// Set color attachment map entries

MTLLogicalToPhysicalColorAttachmentMap* myAttachmentRemap = [MTLLogicalToPhysicalColorAttachmentMap new];

[myAttachmentRemap setPhysicalIndex:0 forLogicalIndex:0];
[myAttachmentRemap setPhysicalIndex:3 forLogicalIndex:1];
[myAttachmentRemap setPhysicalIndex:4 forLogicalIndex:2];

4:57 - Set a color attachment map per pipeline

// Set a color attachment map per pipeline

[renderEncoder setRenderPipelineState:myPipeline];
[renderEncoder setColorAttachmentMap:myAttachmentRemap];
// Draw with myPipeline

[renderEncoder setRenderPipelineState:myPipeline2];
[renderEncoder setColorAttachmentMap:myAttachmentRemap2];
// Draw with myPipeline2

8:03 - Encode a single render pass with 3 render encoders

// Encode a single render pass with 3 render encoders with suspend/resume options


id<MTL4RenderCommandEncoder> enc0 = [cmdbuf0 renderCommandEncoderWithDescriptor:desc options:MTL4RenderEncoderOptionSuspending];

id<MTL4RenderCommandEncoder> enc1 = [cmdbuf1 renderCommandEncoderWithDescriptor:desc options:MTL4RenderEncoderOptionResuming | MTL4RenderEncoderOptionSuspending];

id<MTL4RenderCommandEncoder> enc2 = [cmdbuf2 renderCommandEncoderWithDescriptor:desc options:MTL4RenderEncoderOptionResuming];


id<MTL4CommandBuffer> cmdbufs[] = { cmdbuf0, cmdbuf1, cmdbuf2 };
[commandQueue commit:cmdbufs count:3]

11:48 - Synchronize drawable contents

// Synchronize drawable contents

id<MTLDrawable> drawable = [metalLayer nextDrawable];
[queue waitForDrawable:drawable];

// ... encode render commands to commandBuffer ...
[queue commit:&commandBuffer count:1];

[queue signalDrawable:drawable];

[drawable present];

13:25 - Encode a queue barrier to synchronize data

// Encode a queue barrier to synchronize data

id<MTL4ComputeCommandEncoder> compute = [commandBuffer computeCommandEncoder];

[compute dispatchThreadgroups:threadGrid threadsPerThreadgroup:threadsPerThreadgroup];

[compute endEncoding];


id<MTL4RenderCommandEncoder> render = [commandBuffer renderCommandEncoderWithDescriptor:des];

[render barrierAfterQueueStages:MTLStageDispatch
                   beforeStages:MTLStageFragment
              visibilityOptions:MTL4VisibilityOptionDevice];

[renderCommandEncoder drawPrimitives:MTLPrimitiveTypeTriangle
                         vertexStart:vertexStart
                         vertexCount:vertexCount];

[render endEncoding];

14:57 - Create a texture view pool

// Create a texture view pool

MTLResourceViewPoolDescriptor *desc = [[MTLResourceViewPoolDescriptor alloc] init]; 
desc.resourceCount = 500;
 
id <MTLTextureViewPool> myTextureViewPool =  
    [myDevice newTextureViewPoolWithDescriptor:myTextureViewPoolDescriptor 
                                         error:nullptr];

15:07 - Set a texture view

// Set a texture view

MTLResourceID myTextureView = [myTextureViewPool setTextureView:myTexture  
                                                     descriptor:myTextureViewDescriptor  
                                                        atIndex:5];

[myArgumentTable setTexture:myTextureView 
                    atIndex:0];

16:01 - Choose appropriate sparse page size

MTLHeapDescriptor *desc = [MTLHeapDescriptor new];    
desc.type = MTLHeapTypePlacement;
desc.storageMode = MTLStorageModePrivate;
desc.maxCompatiblePlacementSparsePageSize = MTLSparsePageSize64;
desc.size = alignedHeapSize;

id<MTLHeap> heap = [device newHeapWithDescriptor:desc];

17:05 - Update buffer mappings

// Update buffer mappings

MTL4UpdateSparseBufferMappingOperation bufferOperation;

bufferOperation.mode = MTLSparseTextureMappingModeMap;  
bufferOperation.bufferRange.location = bufferOffsetInTiles;
bufferOperation.bufferRange.length = length;
bufferOperation.heapOffset = heapOffsetInTiles;

[cmdQueue updateBufferMappings:myBuf heap:myHeap operations:&bufferOperation count:1];

20:41 - Set unspecialized configuration

// In MTL4RenderPipelineColorAttachmentDescriptor
// Set unspecialized configuration

pipelineDescriptor.colorAttachments[i].pixelFormat   = MTLPixelFormatUnspecialized;
pipelineDescriptor.colorAttachments[i].writeMask     = MTLColorWriteMaskUnspecialized;
pipelineDescriptor.colorAttachments[i].blendingState = MTL4BlendStateUnspecialized;

21:40 - Create a specialized transparent pipeline

// Create a specialized transparent pipeline

// Set the previously unspecialized properties
pipelineDescriptor.colorAttachments[0].pixelFormat = MTLPixelFormatBGRA8Unorm;
pipelineDescriptor.colorAttachments[0].writeMask =
    MTLColorWriteMaskRed | MTLColorWriteMaskGreen | MTLColorWriteMaskBlue;
pipelineDescriptor.colorAttachments[0].blendingState = MTL4BlendStateEnabled;

pipelineDescriptor.colorAttachments[0].sourceRGBBlendFactor = MTLBlendFactorOne;
pipelineDescriptor.colorAttachments[0].destinationRGBBlendFactor = 
    MTLBlendFactorOneMinusSourceAlpha;
pipelineDescriptor.colorAttachments[0].rgbBlendOperation = MTLBlendOperationAdd;

id<MTLRenderPipelineState> transparentPipeline = 
    [compiler newRenderPipelineStateBySpecializationWithDescriptor:pipelineDescriptor
                                                          pipeline:unspecializedPipeline
                                                             error:&error];

// Similarly, create the specialized opaque and hologram pipelines

26:22 - Determine thread count

// Determine thread count
NSInteger numThreads = 2;
if (@available(macOS 13.3, iOS 19, visionOS 3, tvOS 19, *))
{
    numThreads = [device maximumConcurrentCompilationTaskCount];
}

26:30 - Set a proper QoS class for your compilation threads

// Create thread pool
for (NSInteger i = 0; i < numThreads; ++i)
{
    // Creating a thread with a QoS class DEFAULT
    pthread_attr_set_qos_class_np(&attr, QOS_CLASS_DEFAULT, 0) ;
    pthread_create(&threadIds[i], &attr, entryPoint, NULL);
    pthread_attr_destroy(&attr);
}

28:24 - Harvest pipeline configuration scripts

// Harvest pipeline configuration scripts with the pipeline data set serializer

// Create a pipeline data set serializer that only captures descriptors
MTL4PipelineDataSetSerializerDescriptor *desc = [MTL4PipelineDataSetSerializerDescriptor new];
desc.configuration = MTL4PipelineDataSetSerializerConfigurationCaptureDescriptors;
id<MTL4PipelineDataSetSerializer> serializer =
    [device newPipelineDataSetSerializerWithDescriptor:desc];

// Set the pipeline data set serializer when creating the compiler
MTL4CompilerDescriptor *compilerDesc = [MTL4CompilerDescriptor new];
[compilerDesc setPipelineDataSetSerializer:serializer];
id<MTL4Compiler> compiler = [device newCompilerWithDescriptor:compilerDesc error:nil];

// Create pipelines using the compiler as usual

// Serialize the descriptors as a pipeline script
NSData *data = [serializer serializeAsPipelinesScriptWithError:&err];

// Write the pipeline script data to disk
NSString *path = [NSString pathWithComponents:@[folder, @"pipelines.mtl4-json"]];
BOOL success = [data writeToFile:path options:NSDataWritingAtomic error:&err];

30:28 - Query pipeline state from MTLArchive

// Query pipeline state from MTLArchive

id<MTL4Archive> archive = [device newArchiveWithURL:archiveURL error:&error];

id<MTLRenderPipelineState> pipeline = 
    [archive newRenderPipelineStateWithDescriptor:descriptor error:&error];

if (pipeline == nil)
{
    // handle lookup miss
		pipeline = [compiler newRenderPipelineStateWithDescriptor:descriptor 
                                          compilerTaskOptions:nil 
}