mirror of
https://github.com/UberGames/lilium-voyager.git
synced 2024-12-14 22:20:58 +00:00
75 lines
2.2 KiB
GLSL
75 lines
2.2 KiB
GLSL
uniform sampler2D u_ScreenImageMap;
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uniform sampler2D u_ScreenDepthMap;
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uniform vec4 u_ViewInfo; // zfar / znear, zfar, 1/width, 1/height
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varying vec2 var_ScreenTex;
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//float gauss[8] = float[8](0.17, 0.17, 0.16, 0.14, 0.12, 0.1, 0.08, 0.06);
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//float gauss[5] = float[5](0.30, 0.23, 0.097, 0.024, 0.0033);
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float gauss[4] = float[4](0.40, 0.24, 0.054, 0.0044);
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//float gauss[3] = float[3](0.60, 0.19, 0.0066);
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#define BLUR_SIZE 4
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//#define USE_GAUSS
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float getLinearDepth(sampler2D depthMap, const vec2 tex, const float zFarDivZNear)
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{
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float sampleZDivW = texture2D(depthMap, tex).r;
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return 1.0 / mix(zFarDivZNear, 1.0, sampleZDivW);
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}
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vec4 depthGaussian1D(sampler2D imageMap, sampler2D depthMap, vec2 tex, float zFarDivZNear, float zFar, vec2 scale)
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{
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float depthCenter = getLinearDepth(depthMap, tex, zFarDivZNear);
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// enable for less blurring for farther objects
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scale /= clamp(zFarDivZNear * depthCenter / 32.0, 1.0, 2.0);
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#if defined(USE_HORIZONTAL_BLUR)
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vec2 direction = vec2(scale.x * 2.0, 0.0);
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vec2 nudge = vec2(0.0, scale.y * 0.5);
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#else // if defined(USE_VERTICAL_BLUR)
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vec2 direction = vec2(0.0, scale.y * 2.0);
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vec2 nudge = vec2(scale.x * 0.5, 0.0);
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#endif
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vec2 slope = vec2(dFdx(depthCenter), dFdy(depthCenter)) / vec2(dFdx(tex.x), dFdy(tex.y));
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#if defined(USE_GAUSS)
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vec4 result = texture2D(imageMap, tex) * gauss[0];
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float total = gauss[0];
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#else
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vec4 result = texture2D(imageMap, tex);
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float total = 1.0;
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#endif
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float zLimit = 5.0 / zFar;
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int i, j;
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for (i = 0; i < 2; i++)
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{
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for (j = 1; j < BLUR_SIZE; j++)
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{
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vec2 offset = direction * (float(j) - 0.25) + nudge;
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float depthSample = getLinearDepth(depthMap, tex + offset, zFarDivZNear);
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float depthExpected = depthCenter + dot(slope, offset);
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float useSample = float(abs(depthSample - depthExpected) < zLimit);
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#if defined(USE_GAUSS)
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result += texture2D(imageMap, tex + offset) * (gauss[j] * useSample);
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total += gauss[j] * useSample;
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#else
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result += texture2D(imageMap, tex + offset) * useSample;
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total += useSample;
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#endif
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nudge = -nudge;
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}
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direction = -direction;
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nudge = -nudge;
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}
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return result / total;
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}
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void main()
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{
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gl_FragColor = depthGaussian1D(u_ScreenImageMap, u_ScreenDepthMap, var_ScreenTex, u_ViewInfo.x, u_ViewInfo.y, u_ViewInfo.zw);
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}
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