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feat(UI): add gaussian blur shader core files #1595

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56a8784
blur
davo0411 Nov 6, 2025
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pre-commit-ci[bot] Nov 6, 2025
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refactor
davo0411 Nov 25, 2025
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optimisations
davo0411 Nov 25, 2025
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fixes
davo0411 Nov 25, 2025
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Update BackgroundBlur.cpp
davo0411 Nov 26, 2025
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69 changes: 69 additions & 0 deletions package/Shaders/Menu/BackgroundBlurHorizontal.hlsl
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@midona-rhel midona-rhel Dec 4, 2025

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I am pretty sure BackgroundBlurHorizontal and Vertical can be one file with an ifdef, but I wouldn't put much stock into this tbh

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@davo0411 davo0411 Dec 6, 2025

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Probably could, but smaller files are easier to maintain.

Original file line number Diff line number Diff line change
@@ -0,0 +1,69 @@
// Horizontal Blur Pass Shader
// Part of the BackgroundBlur system - separable Gaussian blur implementation

cbuffer BlurBuffer : register(b0)
{
float4 TexelSize; // x = 1/width, y = 1/height, z = blur strength, w = unused
int4 BlurParams; // x = samples, y = unused, z = unused, w = unused
};

SamplerState LinearSampler : register(s0);
Texture2D InputTexture : register(t0);

struct VS_OUTPUT
{
float4 Position : SV_POSITION;
float2 TexCoord : TEXCOORD0;
};

VS_OUTPUT VS_Main(uint vertexID : SV_VertexID)
{
VS_OUTPUT output;
output.TexCoord = float2((vertexID << 1) & 2, vertexID & 2);
output.Position = float4(output.TexCoord * 2.0f - 1.0f, 0.0f, 1.0f);
output.Position.y = -output.Position.y;
return output;
}

// Precomputed normalized Gaussian weights (sigma = 2.0)
static const float WEIGHTS[8] = {
0.1760327f, // offset 0 (center)
0.1658591f, // offset ±1
0.1403215f, // offset ±2
0.1069852f, // offset ±3
0.0732894f, // offset ±4
0.0451904f, // offset ±5
0.0248657f, // offset ±6
0.0122423f // offset ±7
};

float4 PS_Main(VS_OUTPUT input) : SV_TARGET
{
const int samples = min(BlurParams.x, 15);
const int halfSamples = samples / 2;

// Compute normalization factor for actual weights used
float weightSum = WEIGHTS[0];
[unroll(7)]
for (int j = 1; j <= halfSamples; ++j)
{
weightSum += 2.0f * WEIGHTS[min(j, 7)];
}
const float normalization = 1.0f / weightSum;

// Sample center pixel
float4 result = InputTexture.Sample(LinearSampler, input.TexCoord) * (WEIGHTS[0] * normalization);

// Sample symmetric pairs
[unroll(7)]
for (int i = 1; i <= halfSamples; ++i)
{
float weight = WEIGHTS[min(i, 7)] * normalization;
float offset = i * TexelSize.x;

result += InputTexture.Sample(LinearSampler, input.TexCoord + float2(offset, 0.0f)) * weight;
result += InputTexture.Sample(LinearSampler, input.TexCoord - float2(offset, 0.0f)) * weight;
}

return result;
}
69 changes: 69 additions & 0 deletions package/Shaders/Menu/BackgroundBlurVertical.hlsl
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Original file line number Diff line number Diff line change
@@ -0,0 +1,69 @@
// Vertical Blur Pass Shader
// Part of the BackgroundBlur system - separable Gaussian blur implementation

cbuffer BlurBuffer : register(b0)
{
float4 TexelSize; // x = 1/width, y = 1/height, z = blur strength, w = unused
int4 BlurParams; // x = samples, y = unused, z = unused, w = unused
};

SamplerState LinearSampler : register(s0);
Texture2D InputTexture : register(t0);

struct VS_OUTPUT
{
float4 Position : SV_POSITION;
float2 TexCoord : TEXCOORD0;
};

VS_OUTPUT VS_Main(uint vertexID : SV_VertexID)
{
VS_OUTPUT output;
output.TexCoord = float2((vertexID << 1) & 2, vertexID & 2);
output.Position = float4(output.TexCoord * 2.0f - 1.0f, 0.0f, 1.0f);
output.Position.y = -output.Position.y;
return output;
}

// Precomputed normalized Gaussian weights (sigma = 2.0)
static const float WEIGHTS[8] = {
0.1760327f, // offset 0 (center)
0.1658591f, // offset ±1
0.1403215f, // offset ±2
0.1069852f, // offset ±3
0.0732894f, // offset ±4
0.0451904f, // offset ±5
0.0248657f, // offset ±6
0.0122423f // offset ±7
};

float4 PS_Main(VS_OUTPUT input) : SV_TARGET
{
const int samples = min(BlurParams.x, 15);
const int halfSamples = samples / 2;

// Compute normalization factor for actual weights used
float weightSum = WEIGHTS[0];
[unroll(7)]
for (int j = 1; j <= halfSamples; ++j)
{
weightSum += 2.0f * WEIGHTS[min(j, 7)];
}
const float normalization = 1.0f / weightSum;

// Sample center pixel
float4 result = InputTexture.Sample(LinearSampler, input.TexCoord) * (WEIGHTS[0] * normalization);

// Sample symmetric pairs
[unroll(7)]
for (int i = 1; i <= halfSamples; ++i)
{
float weight = WEIGHTS[min(i, 7)] * normalization;
float offset = i * TexelSize.y;

result += InputTexture.Sample(LinearSampler, input.TexCoord + float2(0.0f, offset)) * weight;
result += InputTexture.Sample(LinearSampler, input.TexCoord - float2(0.0f, offset)) * weight;
}

return result;
}
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