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41 lines
1.4 KiB
Plaintext
41 lines
1.4 KiB
Plaintext
// Copyright Epic Games, Inc. All Rights Reserved.
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#include "BloomCommon.ush"
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//------------------------------------------------------- CONFIG
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#define TILE_SIZE 8
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//------------------------------------------------------- PARAMETERS
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uint2 KernelSpatialTextureSize;
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Texture2D KernelSpatialTexture;
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SamplerState KernelSpatialSampler;
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RWTexture2D<float4> DownsampleKernelSpatialOutput;
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//------------------------------------------------------- ENTRY POINT
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[numthreads(TILE_SIZE, TILE_SIZE, 1)]
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void MainCS(
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uint2 GroupId : SV_GroupID,
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uint GroupThreadIndex : SV_GroupIndex)
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{
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uint2 OutputPixelCoord = TILE_SIZE * GroupId + uint2(GroupThreadIndex % TILE_SIZE, GroupThreadIndex / TILE_SIZE);
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float2 TextureUV = (float2(OutputPixelCoord) * 2.0 + 1.0) / float2(KernelSpatialTextureSize);
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float2 Offset = 0.7 / float2(KernelSpatialTextureSize);
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float4 KernelColor = 0.0;
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KernelColor += 0.25 * KernelSpatialTexture.SampleLevel(KernelSpatialSampler, TextureUV + float2(+1, +1) * Offset, 0);
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KernelColor += 0.25 * KernelSpatialTexture.SampleLevel(KernelSpatialSampler, TextureUV + float2(+1, -1) * Offset, 0);
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KernelColor += 0.25 * KernelSpatialTexture.SampleLevel(KernelSpatialSampler, TextureUV + float2(-1, -1) * Offset, 0);
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KernelColor += 0.25 * KernelSpatialTexture.SampleLevel(KernelSpatialSampler, TextureUV + float2(-1, +1) * Offset, 0);
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DownsampleKernelSpatialOutput[OutputPixelCoord] = KernelColor;
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}
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