21 lines
873 B
GLSL
21 lines
873 B
GLSL
//------------------------------------------------------------------------------
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// Shadowing
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//------------------------------------------------------------------------------
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#if defined(HAS_SHADOWING)
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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 computeLightSpacePosition(const vec3 p, const vec3 n, const vec3 l,
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const float b, const mat4 lightFromWorldMatrix) {
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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 * b);
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vec4 lightSpacePosition = (lightFromWorldMatrix * vec4(offsetPosition, 1.0));
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return lightSpacePosition;
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}
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#endif
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