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Custom alpha-to-coverage

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This commit is contained in:
numzero 2024-11-17 20:03:34 +03:00
parent f00f5f2f77
commit 30f02e4ff2
2 changed files with 33 additions and 4 deletions
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2
src/bin/wireframe/main.rs
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@ -247,7 +247,7 @@ impl<'a> State<'a> {
wgpu::MultisampleState {
count: viewport.sample_count(),
mask: !0,
alpha_to_coverage_enabled: true,
alpha_to_coverage_enabled: false,
},
);

35
src/bin/wireframe/mesh.wgsl
View File

@ -20,15 +20,44 @@ struct VertexOutput {
@location(0) vertex_color: vec4<f32>,
}
struct FragmentOutput {
@location(0) color: vec4<f32>,
@builtin(sample_mask) mask: u32,
}
fn hash(key : u32) -> u32 {
var v = key;
v *= 0xb384af1bu;
v ^= v >> 15u;
return v;
}
@vertex
fn vs_main(ver: VertexInput) -> VertexOutput {
var out: VertexOutput;
out.vertex_color = mesh.color;
var light = dot(ver.normal, normalize(vec3(1., 1., 1.)));
light = .7 + .3 * light;
out.vertex_color = light * mesh.color;
out.clip_position = camera.mvp * vec4(ver.position, 1.);
return out;
}
@fragment
fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
return in.vertex_color;
fn fs_main(in: VertexOutput) -> FragmentOutput {
var out: FragmentOutput;
out.color = vec4(in.vertex_color.xyz, 1.);
var x = bitcast<u32>(in.clip_position.x);
var y = bitcast<u32>(in.clip_position.y);
var z = bitcast<u32>(in.clip_position.z);
var alpha = in.vertex_color.w;
var seed = hash(hash(hash(x) ^ y) ^ z);
var mask = 0u;
for (var sample = 0u; sample < 8u; sample++) {
var threshold = f32(hash(seed ^ sample)) / 0x1p32;
if (alpha > threshold) {
mask |= 1u << sample;
}
}
out.mask = mask;
return out;
}