65 lines
2.4 KiB
HLSL
65 lines
2.4 KiB
HLSL
#ifndef DEPTH_AWARE_GAUSSIAN_BLUR_INCLUDED
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#define DEPTH_AWARE_GAUSSIAN_BLUR_INCLUDED
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#include "./DeclareDownsampledDepthTexture.hlsl"
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#include "./ProjectionUtils.hlsl"
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#define KERNEL_RADIUS 4
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#define BLUR_DEPTH_FALLOFF 0.5
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static const float KernelWeights[] = { 0.2026, 0.1790, 0.1240, 0.0672, 0.0285 };
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// Blurs the RGB channels of the given texture using depth aware gaussian blur, which uses the downsampled camera depth to apply weights to the blur.
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// The alpha channel is not blurred so the original value is returned.
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float4 DepthAwareGaussianBlur(float2 uv, float2 dir, TEXTURE2D_X(textureToBlur), SAMPLER(sampler_TextureToBlur), float2 textureToBlurTexelSizeXy)
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{
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float4 centerSample = SAMPLE_TEXTURE2D_X(textureToBlur, sampler_TextureToBlur, uv);
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float centerDepth = SampleDownsampledSceneDepth(uv);
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float centerLinearEyeDepth = LinearEyeDepthConsiderProjection(centerDepth);
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int i = 0;
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float3 rgbResult = centerSample.rgb * KernelWeights[i];
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float weights = KernelWeights[i];
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float2 texelSizeTimesDir = textureToBlurTexelSizeXy * dir;
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UNITY_UNROLL
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for (i = -KERNEL_RADIUS; i < 0; ++i)
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{
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float2 uvOffset = (float)i * texelSizeTimesDir;
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float2 uvSample = uv + uvOffset;
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float depth = SampleDownsampledSceneDepth(uvSample);
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float linearEyeDepth = LinearEyeDepthConsiderProjection(depth);
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float depthDiff = abs(centerLinearEyeDepth - linearEyeDepth);
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float r2 = BLUR_DEPTH_FALLOFF * depthDiff;
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float g = exp(-r2 * r2);
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float weight = g * KernelWeights[-i];
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float3 rgb = SAMPLE_TEXTURE2D_X(textureToBlur, sampler_TextureToBlur, uvSample).rgb;
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rgbResult += (rgb * weight);
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weights += weight;
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}
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UNITY_UNROLL
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for (i = 1; i <= KERNEL_RADIUS; ++i)
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{
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float2 uvOffset = (float)i * texelSizeTimesDir;
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float2 uvSample = uv + uvOffset;
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float depth = SampleDownsampledSceneDepth(uvSample);
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float linearEyeDepth = LinearEyeDepthConsiderProjection(depth);
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float depthDiff = abs(centerLinearEyeDepth - linearEyeDepth);
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float r2 = BLUR_DEPTH_FALLOFF * depthDiff;
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float g = exp(-r2 * r2);
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float weight = g * KernelWeights[i];
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float3 rgb = SAMPLE_TEXTURE2D_X(textureToBlur, sampler_TextureToBlur, uvSample).rgb;
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rgbResult += (rgb * weight);
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weights += weight;
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}
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return float4(rgbResult * rcp(weights), centerSample.a);
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}
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#endif |