67 lines
2.0 KiB
GLSL
67 lines
2.0 KiB
GLSL
uniform float inverseShadowmapSize;
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uniform float fixedDepthBias;
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uniform float gradientClamp;
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uniform float gradientScaleBias;
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uniform float shadowFuzzyWidth;
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uniform sampler2D shadowMap;
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void main()
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{
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vec4 shadowUV = gl_TexCoord[0];
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// point on shadowmap
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#if LINEAR_RANGE
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shadowUV.xy = shadowUV.xy / shadowUV.w;
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#else
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shadowUV = shadowUV / shadowUV.w;
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#endif
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float centerdepth = texture2D(shadowMap, shadowUV.xy).x;
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// gradient calculation
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float pixeloffset = inverseShadowmapSize;
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vec4 depths = vec4(
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texture2D(shadowMap, shadowUV.xy + vec2(-pixeloffset, 0)).x,
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texture2D(shadowMap, shadowUV.xy + vec2(+pixeloffset, 0)).x,
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texture2D(shadowMap, shadowUV.xy + vec2(0, -pixeloffset)).x,
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texture2D(shadowMap, shadowUV.xy + vec2(0, +pixeloffset)).x);
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vec2 differences = abs( depths.yw - depths.xz );
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float gradient = min(gradientClamp, max(differences.x, differences.y));
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float gradientFactor = gradient * gradientScaleBias;
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// visibility function
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float depthAdjust = gradientFactor + (fixedDepthBias * centerdepth);
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float finalCenterDepth = centerdepth + depthAdjust;
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// shadowUV.z contains lightspace position of current object
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#if FUZZY_TEST
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// fuzzy test - introduces some ghosting in result and doesn't appear to be needed?
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//float visibility = saturate(1 + delta_z / (gradient * shadowFuzzyWidth));
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float visibility = saturate(1 + (finalCenterDepth - shadowUV.z) * shadowFuzzyWidth * shadowUV.w);
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gl_FragColor = vertexColour * visibility;
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#else
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// hard test
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#if PCF
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// use depths from prev, calculate diff
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depths += depthAdjust;
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float final = (finalCenterDepth > shadowUV.z) ? 1.0 : 0.0;
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final += (depths.x > shadowUV.z) ? 1.0 : 0.0;
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final += (depths.y > shadowUV.z) ? 1.0 : 0.0;
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final += (depths.z > shadowUV.z) ? 1.0 : 0.0;
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final += (depths.w > shadowUV.z) ? 1.0 : 0.0;
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final *= 0.2;
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gl_FragColor = vec4(gl_Color.xyz * final, 1);
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#else
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gl_FragColor = (finalCenterDepth > shadowUV.z) ? gl_Color : vec4(0,0,0,1);
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#endif
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#endif
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}
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