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Summerize Chapter 21: Metal Performance Shaders

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daemyung jang 2022-04-12 21:42:53 +09:00
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# Chapter 21: Metal Performance Shaders
As I read this book, I summarize what I think is wrong. If you think my comments are wrong then please let me know. We can dicuss more and update your opinion.
## 3. Secondary rays
In Renderer, in draw(in:), the code for secondary rays is like this:
```
for _ in 0..<3 {
// MARK: generate intersections between rays and model triangles
intersector.intersectionDataType = .distancePrimitiveIndexCoordinates
intersector.encodeIntersection(commandBuffer: commandBuffer,
intersectionType: .nearest,
rayBuffer: rayBuffer, rayBufferOffset: 0,
intersectionBuffer: intersectionBuffer, intersectionBufferOffset: 0,
rayCount: width * height,
accelerationStructure: accelerationStructure)
// MARK: shading
computeEncoder = commandBuffer.makeComputeCommandEncoder()
computeEncoder?.label = "Shading"
computeEncoder?.setBuffer(uniformBuffer, offset: uniformBufferOffset, index: 0)
computeEncoder?.setBuffer(rayBuffer, offset: 0, index: 1)
computeEncoder?.setBuffer(shadowRayBuffer, offset: 0, index: 2)
computeEncoder?.setBuffer(intersectionBuffer, offset: 0, index: 3)
computeEncoder?.setBuffer(vertexColorBuffer, offset: 0, index: 4)
computeEncoder?.setBuffer(vertexNormalBuffer, offset: 0, index: 5)
computeEncoder?.setBuffer(randomBuffer, offset: randomBufferOffset, index: 6)
computeEncoder?.setTexture(renderTarget, index: 0)
computeEncoder?.setComputePipelineState(shadePipelineState!)
computeEncoder?.dispatchThreadgroups(threadGroups, threadsPerThreadgroup: threadsPerGroup)
computeEncoder?.endEncoding()
// MARK: shadows
intersector.label = "Shadow Intersector"
intersector.intersectionDataType = .distance
intersector.encodeIntersection(commandBuffer: commandBuffer,
intersectionType: .any,
rayBuffer: shadowRayBuffer, rayBufferOffset: 0,
intersectionBuffer: intersectionBuffer, intersectionBufferOffset: 0,
rayCount: width * height,
accelerationStructure: accelerationStructure)
computeEncoder = commandBuffer.makeComputeCommandEncoder()
computeEncoder?.label = "Shadows"
computeEncoder?.setBuffer(uniformBuffer, offset: uniformBufferOffset, index: 0)
computeEncoder?.setBuffer(shadowRayBuffer, offset: 0, index: 1)
computeEncoder?.setBuffer(intersectionBuffer, offset: 0, index: 2)
computeEncoder?.setTexture(renderTarget, index: 0)
computeEncoder?.setComputePipelineState(shadowPipelineState)
computeEncoder?.dispatchThreadgroups(threadGroups, threadsPerThreadgroup: threadsPerGroup)
computeEncoder?.endEncoding()
}
```

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README.md
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@ -34,6 +34,7 @@ You can see color images in this book at [here](https://www.raywenderlich.com/bo
* [Chapter 18: Rendering with Rays](https://github.com/daemyung/metal-by-tutorials/tree/main/18-rendering-with-rays)
* [Chapter 19: Advanced Shadows](https://github.com/daemyung/metal-by-tutorials/tree/main/19-shadows)
* [Chapter 20: Advanced Lighting](https://github.com/daemyung/metal-by-tutorials/tree/main/20-advanced-lighting)
* [Chapter 21: Metal Performance Shaders](https://github.com/daemyung/metal-by-tutorials/tree/main/21-metal-performance-shaders)
## Copyright