ad62b1e4ed
The constant bias can be baked in the shadow map, which saves some cycles in the vertex shader.
21 lines
909 B
GLSL
21 lines
909 B
GLSL
//------------------------------------------------------------------------------
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// Shadowing
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//------------------------------------------------------------------------------
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#if defined(HAS_SHADOWING) && defined(HAS_DIRECTIONAL_LIGHTING)
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/**
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* Computes the light space position of the specified world space point.
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* The returned point may contain a bias to attempt to eliminate common
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* shadowing artifacts such as "acne". To achieve this, the world space
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* normal at the point must also be passed to this function.
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*/
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vec4 getLightSpacePosition(const vec3 p, const vec3 n) {
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vec3 l = frameUniforms.lightDirection;
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float NoL = saturate(dot(n, l));
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float sinTheta = sqrt(1.0 - NoL * NoL);
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vec3 offsetPosition = p + n * (sinTheta * frameUniforms.shadowBias.y);
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vec4 lightSpacePosition = (getLightFromWorldMatrix() * vec4(offsetPosition, 1.0));
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return lightSpacePosition;
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}
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#endif
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