225556532a
The standalone per-category UI shaders (quads/circles/images/text) unconditionally imageLoad the destination pixel up front and imageStore it at the end, paying a full read-modify-write even on tiles no item touches — the common case for a sparse UI. The fused uber-kernel already amortizes a single load/store across all four categories; the standalone Dispatch* path has no such umbrella. Defer the imageLoad to just before the first surviving blend (`loaded` flag) and skip the imageStore unless something was actually blended. Output is bit-identical: before the first blend `dst` is unused, and a skipped store leaves the pixel exactly as a no-op load+store would have rewritten it. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
111 lines
4.4 KiB
GLSL
111 lines
4.4 KiB
GLSL
#version 460
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#extension GL_GOOGLE_include_directive : enable
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#include "ui-shared.glsl"
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// One workgroup per 8×8 screen tile. The workgroup cooperatively streams the
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// QuadItem list in chunks of 64 (see ui-shared.glsl), culling each chunk
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// against the tile and compacting survivors — in buffer order — into shared
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// memory; every thread then runs the per-pixel accumulate over only those
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// survivors. Item order in the buffer == draw order on screen.
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layout(push_constant) uniform PC {
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UIDispatchHeader hdr;
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} pc;
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layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
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// Per-chunk cooperative-cull scratch (one slot per workgroup thread).
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shared vec4 s_rect[UI_CHUNK];
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shared vec4 s_color[UI_CHUNK];
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shared vec4 s_corners[UI_CHUNK];
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shared vec4 s_outline[UI_CHUNK];
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shared uint s_keep[UI_CHUNK];
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shared uint s_order[UI_CHUNK];
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shared uint s_count;
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void main() {
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// NOTE: do not early-return — every thread must reach the barriers below.
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ivec2 screenPx;
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bool valid = uiResolveScreenPixel(pc.hdr, screenPx);
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// Defer the destination read-modify-write: a sparse UI leaves most tiles
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// untouched, so only load the pixel when the first surviving item blends
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// over it (`loaded`), and only store when something actually touched it.
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// The fused kernel amortizes a single load/store across all categories; the
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// standalone Dispatch* path has no such umbrella and otherwise pays a full
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// read-modify-write per empty tile.
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vec4 dst = vec4(0.0);
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vec2 sp = vec2(0.0);
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bool loaded = false;
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if (valid) sp = vec2(screenPx) + 0.5;
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vec2 tileMin, tileMax;
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uiTileBounds(tileMin, tileMax);
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uint lid = gl_LocalInvocationIndex;
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for (uint base = 0u; base < pc.hdr.itemCount; base += UI_CHUNK) {
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// Cooperative load: each thread reads one item member-by-member
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// (the NVIDIA descriptor-heap workaround) into shared and culls it.
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uint idx = base + lid;
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bool keep = false;
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if (idx < pc.hdr.itemCount) {
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s_rect[lid] = uiQuadHeap[pc.hdr.itemBuffer].items[idx].rect;
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s_color[lid] = uiQuadHeap[pc.hdr.itemBuffer].items[idx].color;
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s_corners[lid] = uiQuadHeap[pc.hdr.itemBuffer].items[idx].corners;
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s_outline[lid] = uiQuadHeap[pc.hdr.itemBuffer].items[idx].outline;
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keep = uiAabbOverlapsTile(s_rect[lid].xy, s_rect[lid].xy + s_rect[lid].zw,
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tileMin, tileMax);
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}
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s_keep[lid] = keep ? 1u : 0u;
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barrier();
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// Stable in-order compaction of this chunk's survivors.
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if (lid == 0u) {
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uint n = 0u;
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uint lim = min(UI_CHUNK, pc.hdr.itemCount - base);
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for (uint k = 0u; k < lim; ++k)
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if (s_keep[k] != 0u) s_order[n++] = k;
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s_count = n;
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}
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barrier();
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if (valid) {
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for (uint j = 0u; j < s_count; ++j) {
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uint c = s_order[j];
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// Cheap pre-test against the item's axis-aligned rect.
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vec2 lo = s_rect[c].xy;
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vec2 hi = s_rect[c].xy + s_rect[c].zw;
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if (sp.x < lo.x || sp.y < lo.y) continue;
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if (sp.x >= hi.x || sp.y >= hi.y) continue;
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vec2 halfSize = s_rect[c].zw * 0.5;
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vec2 p = sp - (s_rect[c].xy + halfSize);
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float d = uiSdRoundRect(p, halfSize, s_corners[c]);
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vec4 outline = s_outline[c];
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float bodyA = clamp(0.5 - d, 0.0, 1.0);
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if (bodyA <= 0.0 && outline.x <= 0.0) continue;
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vec4 col = s_color[c];
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vec4 src = vec4(col.rgb, col.a * bodyA);
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if (outline.x > 0.0) {
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float t = abs(d + outline.x * 0.5) - outline.x * 0.5;
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float outlineA = clamp(0.5 - t, 0.0, 1.0);
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src.rgb = mix(src.rgb, outline.yzw, outlineA);
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src.a = max(src.a, outlineA);
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}
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if (src.a <= 0.0) continue;
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if (!loaded) {
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dst = imageLoad(uiImages[pc.hdr.outImage], screenPx);
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loaded = true;
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}
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dst = uiBlendOver(dst, src);
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}
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}
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barrier(); // done reading shared for this chunk before it's overwritten
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}
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if (loaded) imageStore(uiImages[pc.hdr.outImage], screenPx, dst); // loaded ⇒ valid
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}
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