Catcrafts/Crafter.Graphics
2
0
Fork 0
Code Issues 1 Pull requests Projects Releases Packages Wiki Activity Actions

Merge pull request 'perf(ui): skip the destination read-modify-write on empty tiles (#127)' (#144) from claude/issue-127 into master

Browse source
This commit is contained in:
catbot 2026-06-18 15:27:08 +02:00
commit e1222c0ab7
4 changed files with 60 additions and 28 deletions
Download patch file Download diff file Expand all files Collapse all files

22
shaders/ui-text.comp.glsl
View file

@ -38,12 +38,16 @@ void main() {
ivec2 screenPx;
bool valid = uiResolveScreenPixel(pc.hdr, screenPx);
vec4 dst = vec4(0.0);
vec2 sp = vec2(0.0);
if (valid) {
dst = imageLoad(uiImages[pc.hdr.outImage], screenPx);
sp = vec2(screenPx) + 0.5;
}
// Defer the destination read-modify-write: a sparse UI leaves most tiles
// untouched, so only load the pixel when the first surviving glyph blends
// over it (`loaded`), and only store when something actually touched it.
// The fused kernel amortizes a single load/store across all categories; the
// standalone Dispatch* path has no such umbrella and otherwise pays a full
// read-modify-write per empty tile.
vec4 dst = vec4(0.0);
vec2 sp = vec2(0.0);
bool loaded = false;
if (valid) sp = vec2(screenPx) + 0.5;
vec2 tileMin, tileMax;
uiTileBounds(tileMin, tileMax);
@ -110,11 +114,15 @@ void main() {
vec4 col = s_color[c];
vec4 src = vec4(col.rgb, col.a * a);
if (!loaded) {
dst = imageLoad(uiImages[pc.hdr.outImage], screenPx);
loaded = true;
}
dst = uiBlendOver(dst, src);
}
}
barrier();
}
if (valid) imageStore(uiImages[pc.hdr.outImage], screenPx, dst);
if (loaded) imageStore(uiImages[pc.hdr.outImage], screenPx, dst); // loaded ⇒ valid
}