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Add soft shadows

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This commit is contained in:
Lauri Räsänen 2023-11-04 20:24:18 +02:00
parent 6c9fd76c42
commit 61e95cb550
3 changed files with 31 additions and 10 deletions
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33
res/shaders/pbr.wgsl
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@ -74,14 +74,29 @@ fn sample_direct_light(index: i32, light_coords: vec4<f32>) -> f32 {
let flip_correction = vec2<f32>(0.5, -0.5);
let proj_correction = 1.0 / light_coords.w;
let light_local = light_coords.xy * flip_correction * proj_correction + vec2<f32>(0.5, 0.5);
let reference_depth = light_coords.z * proj_correction;
return textureSampleCompareLevel(
t_light_depth,
s_light_depth,
light_local,
index,
light_coords.z * proj_correction
);
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;
}
let s = textureSampleCompareLevel(
t_light_depth,
s_light_depth,
light_local + offset,
index,
reference_depth
);
total_sample += s * INV_SHADOW_SAMPLES;
}
return total_sample;
}
@fragment
@ -118,6 +133,8 @@ fn fs_main(vert: VertexOutput) -> @location(0) vec4<f32> {
}
in_light = sample_direct_light(i, light_coords);
// TODO should break even if 0 since we're inside frustum.
// See if causes issues with bias overlap between directions.
if (in_light > 0.0) {
break;
}
@ -138,7 +155,7 @@ fn fs_main(vert: VertexOutput) -> @location(0) vec4<f32> {
// radiance
let radiance_strength = max(dot(normal_dir, light_dir), 0.0);
let radiance = radiance_strength * light.color.xyz * light.color.w * light_attenuation;
let radiance = radiance_strength * light.color.xyz * light.color.w * light_attenuation * in_light;
// brdf shading
total_radiance += radiance * brdf(