98 lines
2.8 KiB
Bash
98 lines
2.8 KiB
Bash
/*
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* Copyright 2021 elven cache. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
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*/
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#ifndef FS_DENOISE_SPATIAL_IMPLEMENTATION_SH
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#define FS_DENOISE_SPATIAL_IMPLEMENTATION_SH
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#include "../common/common.sh"
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#include "parameters.sh"
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#include "normal_encoding.sh"
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SAMPLER2D(s_color, 0); // input color, signal to be denoised
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SAMPLER2D(s_normal, 1); // scene's gbuffer normal, used for edge stopping function
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SAMPLER2D(s_depth, 2); // scene's depth, used for edge stopping function
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void main()
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{
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vec2 texCoord = v_texcoord0;
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// read center pixel
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vec4 color = texture2D(s_color, texCoord);
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vec3 normal = NormalDecode(texture2D(s_normal, texCoord).xyz); // * 2.0 - 1.0;
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float depth = texture2D(s_depth, texCoord).x;
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// want depth gradient for edge stopping function
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float depthGradient = abs(dFdx(depth)) + abs(dFdy(depth));
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float du = u_texCoordStep * u_viewTexel.x;
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float dv = u_texCoordStep * u_viewTexel.y;
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#if USE_SPATIAL_5X5
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float gaussianWeights[5];
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gaussianWeights[0] = 1.0/16.0;
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gaussianWeights[1] = 4.0/16.0;
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gaussianWeights[2] = 6.0/16.0;
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gaussianWeights[3] = 4.0/16.0;
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gaussianWeights[4] = 1.0/16.0;
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float initialWeight = (gaussianWeights[2]*gaussianWeights[2]);
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int centerIdx = 2;
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vec4 accumulateColor = color * initialWeight;
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float accumulateWeight = initialWeight;
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for (int yy = 0; yy < 5; ++yy)
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{
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for (int xx = 0; xx < 5; ++xx)
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{
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#else
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float gaussianWeights[3];
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gaussianWeights[0] = 1.0/4.0;
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gaussianWeights[1] = 2.0/4.0;
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gaussianWeights[2] = 1.0/4.0;
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float initialWeight = (gaussianWeights[1]*gaussianWeights[1]);
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int centerIdx = 1;
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vec4 accumulateColor = color * initialWeight;
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float accumulateWeight = initialWeight;
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for (int yy = 0; yy < 3; ++yy)
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{
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for (int xx = 0; xx < 3; ++xx)
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{
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#endif // USE_SPATIAL_5X5
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if ((centerIdx == xx) && (centerIdx == yy)) {
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continue;
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}
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float xOffset = float(xx) - float(centerIdx);
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float yOffset = float(yy) - float(centerIdx);
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vec2 sampleTexCoord = texCoord;
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sampleTexCoord.x += xOffset * du;
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sampleTexCoord.y += yOffset * dv;
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vec4 sampleColor = texture2D(s_color, sampleTexCoord);
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vec3 sampleNormal = NormalDecode(texture2D(s_normal, sampleTexCoord).xyz);
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float normalWeight = pow(saturate(dot(normal, sampleNormal)), u_sigmaNormal);
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float sampleDepth = texture2D(s_depth, sampleTexCoord).x;
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float depthDelta = depth - sampleDepth;
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float depthWeight = exp(-abs(depthDelta) / max(1e-5, u_sigmaDepth*u_sigmaDepth));
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float weight = depthWeight * normalWeight;
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// apply gaussian
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weight *= (gaussianWeights[xx]*gaussianWeights[yy]);
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accumulateColor += sampleColor * weight;
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accumulateWeight += weight;
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}
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}
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accumulateColor /= max(accumulateWeight, 1e-5);
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gl_FragColor = accumulateColor;
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}
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#endif // FS_DENOISE_SPATIAL_IMPLEMENTATION_SH
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