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improve code readibility

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This commit is contained in:
Mathias Agopian
2019-04-12 17:45:09 -07:00
committed by Mathias Agopian
parent ad62b1e4ed
commit 072c5ffd78
1 changed files with 8 additions and 4 deletions
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12
shaders/src/shadowing.fs
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@@ -41,10 +41,14 @@ vec2 computeReceiverPlaneDepthBias(const vec3 position) {
// see: GDC '06: Shadow Mapping: GPU-based Tips and Techniques
vec2 bias;
#if SHADOW_RECEIVER_PLANE_DEPTH_BIAS == SHADOW_RECEIVER_PLANE_DEPTH_BIAS_ENABLED
vec3 dx = dFdx(position);
vec3 dy = dFdy(position);
bias = vec2(dy.y * dx.z - dx.y * dy.z, dx.x * dy.z - dy.x * dx.z);
bias *= 1.0 / ((dx.x * dy.y) - (dx.y * dy.x));
vec3 du = dFdx(position);
vec3 dv = dFdy(position);
// Chain rule we use:
// | du.x du.y |^-T | dv.y -du.y |T | dv.y -dv.x |
// D * | dv.x dv.y | = | -dv.x du.x | = | -du.y du.x |
bias = inverse(mat2(du.xy, dv.xy)) * vec2(du.z, dv.z);
#else
bias = vec2(0.0);
#endif