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improve PCF

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This commit is contained in:
Lauri Räsänen 2023-11-05 15:39:04 +02:00
parent dab82367f0
commit 057240acc1
2 changed files with 16 additions and 19 deletions
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7
res/shaders/constants.wgsl
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@ -1,6 +1,7 @@
const PI = 3.14159;
const INV_SQRT_2 = 0.70710678118654752440; // 1 / sqrt(2)
const INV_SQRT_3 = 0.57735026918962576451; // 1 / sqrt(3)
const SHADOW_SAMPLES = 8;
const INV_SHADOW_SAMPLES = 1.0 / 8.0;
const SHADOW_SAMPLE_DIST = 0.001;
// in every direction from 0,0
// total = (2n + 1)^2
const SHADOW_SAMPLES = 2;
const INV_SHADOW_SAMPLES = 1.0 / 25.0;

14
res/shaders/pbr.wgsl
View file

@ -78,15 +78,10 @@ fn sample_direct_light(index: i32, light_coords: vec4<f32>) -> f32 {
let reference_depth = light_coords.z * proj_correction - bias;
var total_sample = 0.0;
for (var i: i32 = 0; i < SHADOW_SAMPLES; i++) {
let phase = i % 4;
var offset = vec2<f32>(f32(i / 4) * SHADOW_SAMPLE_DIST);
if (phase == 1 || phase == 3) {
offset.x = -offset.x;
}
if (phase == 2 || phase == 3) {
offset.y = -offset.y;
}
for (var x: i32 = -SHADOW_SAMPLES; x < SHADOW_SAMPLES; x++) {
for (var y: i32 = -SHADOW_SAMPLES; y < SHADOW_SAMPLES; y++) {
let texelSize = vec2<f32>(textureDimensions(t_light_depth));
let offset = vec2<f32>(f32(x), f32(y)) / texelSize.xy;
let s = textureSampleCompare(
t_light_depth,
s_light_depth,
@ -96,6 +91,7 @@ fn sample_direct_light(index: i32, light_coords: vec4<f32>) -> f32 {
);
total_sample += s * INV_SHADOW_SAMPLES;
}
}
return total_sample;
}