63 lines
No EOL
1.6 KiB
Text
63 lines
No EOL
1.6 KiB
Text
/* Copyright (c) 2025, Sascha Willems
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*
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* SPDX-License-Identifier: MIT
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*
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*/
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struct VSOutput
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{
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float4 Pos : SV_POSITION;
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float2 UV;
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};
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struct UBO
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{
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float blurScale;
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float blurStrength;
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};
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ConstantBuffer<UBO> ubo;
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Sampler2D samplerColor;
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[[SpecializationConstant]] const int blurdirection = 0;
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[shader("vertex")]
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VSOutput vertexMain(uint VertexIndex: SV_VertexID)
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{
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VSOutput output;
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output.UV = float2((VertexIndex << 1) & 2, VertexIndex & 2);
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output.Pos = float4(output.UV * 2.0f - 1.0f, 0.0f, 1.0f);
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return output;
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}
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[shader("fragment")]
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float4 fragmentMain(VSOutput input)
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{
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float weight[5];
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weight[0] = 0.227027;
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weight[1] = 0.1945946;
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weight[2] = 0.1216216;
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weight[3] = 0.054054;
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weight[4] = 0.016216;
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float2 textureSize;
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samplerColor.GetDimensions(textureSize.x, textureSize.y);
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float2 tex_offset = 1.0 / textureSize * ubo.blurScale; // gets size of single texel
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float3 result = samplerColor.Sample(input.UV).rgb * weight[0]; // current fragment's contribution
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for(int i = 1; i < 5; ++i)
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{
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if (blurdirection == 1)
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{
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// H
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result += samplerColor.Sample(input.UV + float2(tex_offset.x * i, 0.0)).rgb * weight[i] * ubo.blurScale;
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result += samplerColor.Sample(input.UV - float2(tex_offset.x * i, 0.0)).rgb * weight[i] * ubo.blurScale;
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}
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else
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{
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// V
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result += samplerColor.Sample(input.UV + float2(0.0, tex_offset.y * i)).rgb * weight[i] * ubo.blurScale;
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result += samplerColor.Sample(input.UV - float2(0.0, tex_offset.y * i)).rgb * weight[i] * ubo.blurScale;
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}
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}
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return float4(result, 1.0);
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} |