playcanvas/build/playcanvas/src/scene/shader-lib/chunks/lit/frag/shadowCascades.js

PlayCanvas WebGL game engine

var shadowCascadesPS = "\nint getShadowCascadeIndex(vec4 shadowCascadeDistances, int shadowCascadeCount) {\n	float depth = 1.0 / gl_FragCoord.w;\n	vec4 comparisons = step(shadowCascadeDistances, vec4(depth));\n	int cascadeIndex = int(dot(comparisons, vec4(1.0)));\n	return min(cascadeIndex, shadowCascadeCount - 1);\n}\nint ditherShadowCascadeIndex(int cascadeIndex, vec4 shadowCascadeDistances, int shadowCascadeCount, float blendFactor) {\n \n	if (cascadeIndex < shadowCascadeCount - 1) {\n		float currentRangeEnd = shadowCascadeDistances[cascadeIndex];\n		float transitionStart = blendFactor * currentRangeEnd;\n		float depth = 1.0 / gl_FragCoord.w;\n		if (depth > transitionStart) {\n			float transitionFactor = smoothstep(transitionStart, currentRangeEnd, depth);\n			float dither = fract(sin(dot(gl_FragCoord.xy, vec2(12.9898, 78.233))) * 43758.5453);\n			if (dither < transitionFactor) {\n				cascadeIndex += 1;\n			}\n		}\n	}\n	return cascadeIndex;\n}\nvoid fadeShadow(vec4 shadowCascadeDistances) {				  \n	float depth = 1.0 / gl_FragCoord.w;\n	if (depth > shadowCascadeDistances.w) {\n		dShadowCoord.z = -9999999.0;\n	}\n}\n";

export { shadowCascadesPS as default };