65 lines
2.0 KiB
Metal
65 lines
2.0 KiB
Metal
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/*
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See LICENSE folder for this sample’s licensing information.
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Abstract:
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Metal shaders used for this sample
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*/
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#include <metal_stdlib>
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#include <simd/simd.h>
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using namespace metal;
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// Include header shared between this Metal shader code and C code executing Metal API commands.
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#import "AAPLShaderTypes.h"
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// Vertex shader outputs and fragment shader inputs
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typedef struct
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{
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// The [[position]] attribute of this member indicates that this value
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// is the clip space position of the vertex when this structure is
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// returned from the vertex function.
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float4 position [[position]];
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// Since this member does not have a special attribute, the rasterizer
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// interpolates its value with the values of the other triangle vertices
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// and then passes the interpolated value to the fragment shader for each
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// fragment in the triangle.
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float4 color;
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} RasterizerData;
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vertex RasterizerData
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vertexShader(uint vertexID [[vertex_id]],
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constant AAPLVertex *vertices [[buffer(AAPLVertexInputIndexVertices)]],
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constant vector_uint2 *viewportSizePointer [[buffer(AAPLVertexInputIndexViewportSize)]])
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{
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RasterizerData out;
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// Index into the array of positions to get the current vertex.
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// The positions are specified in pixel dimensions (i.e. a value of 100
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// is 100 pixels from the origin).
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float2 pixelSpacePosition = vertices[vertexID].position.xy;
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// Get the viewport size and cast to float.
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vector_float2 viewportSize = vector_float2(*viewportSizePointer);
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// To convert from positions in pixel space to positions in clip-space,
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// divide the pixel coordinates by half the size of the viewport.
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out.position = vector_float4(0.0, 0.0, 0.0, 1.0);
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out.position.xy = pixelSpacePosition / (viewportSize / 2.0);
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// Pass the input color directly to the rasterizer.
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out.color = vertices[vertexID].color;
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return out;
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}
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fragment float4 fragmentShader(RasterizerData in [[stage_in]])
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{
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// Return the interpolated color.
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return in.color;
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}
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