playcanvas
Version:
PlayCanvas WebGL game engine
35 lines (33 loc) • 1.34 kB
JavaScript
var shadowCascadesPS = `
fn getShadowCascadeIndex(shadowCascadeDistances: vec4f, shadowCascadeCount: i32) -> i32 {
let depth: f32 = 1.0 / pcPosition.w;
let comparisons: vec4f = step(shadowCascadeDistances, vec4f(depth));
let cascadeIndex: i32 = i32(dot(comparisons, vec4f(1.0)));
return min(cascadeIndex, shadowCascadeCount - 1);
}
fn ditherShadowCascadeIndex(cascadeIndex_in: i32, shadowCascadeDistances: vec4f, shadowCascadeCount: i32, blendFactor: f32) -> i32 {
var cascadeIndex: i32 = cascadeIndex_in;
if (cascadeIndex < shadowCascadeCount - 1) {
let currentRangeEnd: f32 = shadowCascadeDistances[cascadeIndex];
let transitionStart: f32 = blendFactor * currentRangeEnd;
let depth: f32 = 1.0 / pcPosition.w;
if (depth > transitionStart) {
let transitionFactor: f32 = smoothstep(transitionStart, currentRangeEnd, depth);
let dither: f32 = fract(sin(dot(pcPosition.xy, vec2f(12.9898, 78.233))) * 43758.5453);
if (dither < transitionFactor) {
cascadeIndex = cascadeIndex + 1;
}
}
}
return cascadeIndex;
}
fn fadeShadow(shadowCoord_in: vec3f, shadowCascadeDistances: vec4f) -> vec3f {
var shadowCoord: vec3f = shadowCoord_in;
let depth: f32 = 1.0 / pcPosition.w;
if (depth > shadowCascadeDistances.w) {
shadowCoord.z = -9999999.0;
}
return shadowCoord;
}
`;
export { shadowCascadesPS as default };