Mihaela Mihaljevic
37fd4fb24f
MIT License - Apple Developer sample code Downloaded via Cupertino (https://github.com/mihaelamj/cupertino)
72 lines
2.6 KiB
Objective-C
72 lines
2.6 KiB
Objective-C
/*
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See the LICENSE.txt file for this sample’s licensing information.
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Abstract:
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The types and enum constants the app shares with its Metal shaders and C/ObjC code.
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*/
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#ifndef ShaderTypes_h
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#define ShaderTypes_h
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#import <simd/simd.h>
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/// Defines the binding index values for passing buffer arguments to GPU function parameters.
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///
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/// The binding values define an agreement between:
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/// - The app's main code in Objective-C that submits the data to the GPU
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/// - The shader code that defines the GPU functions, which receive the data through their parameters
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///
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/// The values need to match between both sides of the exchange for the data to get
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/// to the correct place.
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typedef enum BufferBindingIndex
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{
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/// The buffer binding index value that stores the triangle's vertex data.
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///
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/// The data at this binding index stores an array of three ``VertexData`` instances.
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BufferBindingIndexForVertexData = 0,
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/// The buffer binding index value that stores the app's viewport's size.
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///
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/// The vertex shader calculates the pixel coordinates of the triangle's vertices
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/// based on the size of the app's viewport.
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BufferBindingIndexForViewportSize = 1,
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} BufferBindingIndex;
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/// Defines the binding index values for passing texture arguments to GPU function parameters.
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///
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/// The binding values define an agreement between:
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/// - The app's main code in Objective-C that submits the data to the GPU
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/// - The shader code that defines the GPU functions, which receive the data through their parameters
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///
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/// The values need to match between both sides of the exchange for the data to get
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/// to the correct place.
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typedef enum TextureBindingIndex
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{
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/// An index of a color texture for a compute kernel in a compute pass.
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ComputeTextureBindingIndexForColorImage = 0,
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/// An index of a grayscale texture for a compute kernel in a compute pass.
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ComputeTextureBindingIndexForGrayscaleImage = 1,
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/// An index of a texture for a fragment shader in a render pass.
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RenderTextureBindingIndex = 0,
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} TextureBindingIndex;
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/// A type that defines the data layout for a triangle vertex,
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/// which includes position and texture coordinate values.
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///
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/// The app's main code and shader code apply this type for data layout consistency.
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typedef struct VertexData
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{
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/// The location for a vertex in 2D, pixel-coordinate space.
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///
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/// For example, a value of `100` in either dimension means the vertex is
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/// 100 pixels from the origin in that dimension.
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simd_float2 position;
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/// The location within a 2D texture for a vertex.
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simd_float2 textureCoordinate;
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} VertexData;
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#endif /* ShaderTypes_h */
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