67 lines
2.5 KiB
GLSL
67 lines
2.5 KiB
GLSL
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float czm_private_shadowVisibility(float visibility, float nDotL, float normalShadingSmooth, float darkness)
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{
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#ifdef USE_NORMAL_SHADING
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#ifdef USE_NORMAL_SHADING_SMOOTH
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float strength = clamp(nDotL / normalShadingSmooth, 0.0, 1.0);
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#else
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float strength = step(0.0, nDotL);
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#endif
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visibility *= strength;
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#endif
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visibility = max(visibility, darkness);
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return visibility;
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}
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#ifdef USE_CUBE_MAP_SHADOW
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float czm_shadowVisibility(samplerCube shadowMap, czm_shadowParameters shadowParameters)
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{
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float depthBias = shadowParameters.depthBias;
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float depth = shadowParameters.depth;
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float nDotL = shadowParameters.nDotL;
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float normalShadingSmooth = shadowParameters.normalShadingSmooth;
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float darkness = shadowParameters.darkness;
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vec3 uvw = shadowParameters.texCoords;
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depth -= depthBias;
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float visibility = czm_shadowDepthCompare(shadowMap, uvw, depth);
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return czm_private_shadowVisibility(visibility, nDotL, normalShadingSmooth, darkness);
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}
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#else
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float czm_shadowVisibility(sampler2D shadowMap, czm_shadowParameters shadowParameters)
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{
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float depthBias = shadowParameters.depthBias;
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float depth = shadowParameters.depth;
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float nDotL = shadowParameters.nDotL;
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float normalShadingSmooth = shadowParameters.normalShadingSmooth;
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float darkness = shadowParameters.darkness;
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vec2 uv = shadowParameters.texCoords;
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depth -= depthBias;
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#ifdef USE_SOFT_SHADOWS
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vec2 texelStepSize = shadowParameters.texelStepSize;
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float radius = 1.0;
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float dx0 = -texelStepSize.x * radius;
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float dy0 = -texelStepSize.y * radius;
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float dx1 = texelStepSize.x * radius;
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float dy1 = texelStepSize.y * radius;
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float visibility = (
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czm_shadowDepthCompare(shadowMap, uv, depth) +
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czm_shadowDepthCompare(shadowMap, uv + vec2(dx0, dy0), depth) +
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czm_shadowDepthCompare(shadowMap, uv + vec2(0.0, dy0), depth) +
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czm_shadowDepthCompare(shadowMap, uv + vec2(dx1, dy0), depth) +
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czm_shadowDepthCompare(shadowMap, uv + vec2(dx0, 0.0), depth) +
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czm_shadowDepthCompare(shadowMap, uv + vec2(dx1, 0.0), depth) +
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czm_shadowDepthCompare(shadowMap, uv + vec2(dx0, dy1), depth) +
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czm_shadowDepthCompare(shadowMap, uv + vec2(0.0, dy1), depth) +
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czm_shadowDepthCompare(shadowMap, uv + vec2(dx1, dy1), depth)
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) * (1.0 / 9.0);
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#else
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float visibility = czm_shadowDepthCompare(shadowMap, uv, depth);
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#endif
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return czm_private_shadowVisibility(visibility, nDotL, normalShadingSmooth, darkness);
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}
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#endif
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