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https://github.com/storytold/effectcraft.git
synced 2026-10-25 10:36:56 -06:00
Brandon ThomasandClaude Opus 5.5
d0b92948ee
CC Environment now fades nearly transparent environment texels to black continuously (colour / max(alpha, 1e-3)) instead of a hard 1e-6 un-premultiply cut-off, which turned the filtered map's float noise into colour. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
60 lines
1.9 KiB
WebGPU Shading Language
60 lines
1.9 KiB
WebGPU Shading Language
// GPU effects, Numbers and Timecode: see src/fx_text.rs. The glyph coverage is rasterised on
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// the CPU (aux: fill in x, stroke ring in y, opacity applied); this kernel composites it as
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// textfx::draw_plan does: the layer or transparency, Timecode's box, then fill and stroke.
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// u[0] = (display options, keep the layer, box); f[0] = fill colour; f[1] = stroke colour;
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// f[2] = box (x0, x1, y0, y1); f[3] = (box colour, box opacity).
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fn ftx_over(dst: vec4<f32>, s: vec4<f32>) -> vec4<f32> {
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return s + dst * (1.0 - s.w);
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}
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// textfx::tint.
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fn ftx_tint(c: vec4<f32>, a0: f32) -> vec4<f32> {
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let a = clamp(a0 * c.w, 0.0, 1.0);
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return vec4<f32>(c.xyz * a, a);
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}
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@compute @workgroup_size(16, 16)
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fn ftx_text(@builtin(global_invocation_id) gid: vec3<u32>) {
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let p = vec2<i32>(gid.xy);
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let dims = out_dims();
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if (p.x >= dims.x || p.y >= dims.y) {
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return;
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}
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var o = vec4<f32>(0.0);
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if (P.u[0].y != 0u) {
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o = textureLoad(src, p, 0);
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}
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if (P.u[0].z != 0u) {
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let r = P.f[2];
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let fy = f32(p.y) + 0.5;
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let cy = clamp(fy - r.z + 0.5, 0.0, 1.0) * clamp(r.w - fy + 0.5, 0.0, 1.0);
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if (cy > 0.0) {
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let fx = f32(p.x) + 0.5;
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let cx = clamp(fx - r.x + 0.5, 0.0, 1.0) * clamp(r.y - fx + 0.5, 0.0, 1.0);
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let k = cx * cy * P.f[3].w;
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if (k > 0.0) {
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o = ftx_over(o, vec4<f32>(P.f[3].xyz * k, k));
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}
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}
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}
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let cov = textureLoad(aux, p, 0);
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let fill = ftx_tint(P.f[0], cov.x);
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let stroke = ftx_tint(P.f[1], cov.y);
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switch P.u[0].x {
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case 1u: {
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o = ftx_over(o, stroke);
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}
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case 2u: {
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o = ftx_over(ftx_over(o, stroke), fill);
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}
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case 3u: {
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o = ftx_over(ftx_over(o, fill), stroke);
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}
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default: {
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o = ftx_over(o, fill);
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}
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}
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textureStore(out, p, o);
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}
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