mirror of
https://github.com/italicsjenga/vello.git
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a7e926d67b
Helps keeping the code tidy. Style is chosen to minimize diff, but contains a slight bit of personal taste.
87 lines
2.4 KiB
GLSL
87 lines
2.4 KiB
GLSL
// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
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// A scan for a tree reduction prefix scan that outputs the final result.
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// Output is written into memory at trans_alloc.
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#version 450
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#extension GL_GOOGLE_include_directive : enable
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#include "mem.h"
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#include "setup.h"
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#define N_ROWS 8
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#define LG_WG_SIZE (7 + LG_WG_FACTOR)
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#define WG_SIZE (1 << LG_WG_SIZE)
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#define PARTITION_SIZE (WG_SIZE * N_ROWS)
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layout(local_size_x = WG_SIZE, local_size_y = 1) in;
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layout(binding = 1) readonly buffer ConfigBuf {
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Config conf;
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};
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layout(binding = 2) readonly buffer SceneBuf {
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uint[] scene;
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};
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#include "scene.h"
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#include "tile.h"
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#define Monoid Transform
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layout(set = 0, binding = 3) readonly buffer ParentBuf {
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Monoid[] parent;
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};
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Monoid monoid_identity() {
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return Monoid(vec4(1.0, 0.0, 0.0, 1.0), vec2(0.0, 0.0));
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}
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Monoid combine_monoid(Monoid a, Monoid b) {
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Monoid c;
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c.mat = a.mat.xyxy * b.mat.xxzz + a.mat.zwzw * b.mat.yyww;
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c.translate = a.mat.xy * b.translate.x + a.mat.zw * b.translate.y + a.translate;
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return c;
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}
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shared Monoid sh_scratch[WG_SIZE];
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void main() {
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Monoid local[N_ROWS];
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uint ix = gl_GlobalInvocationID.x * N_ROWS;
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TransformRef ref = TransformRef(conf.trans_offset + ix * Transform_size);
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Monoid agg = Transform_read(ref);
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local[0] = agg;
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for (uint i = 1; i < N_ROWS; i++) {
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agg = combine_monoid(agg, Transform_read(Transform_index(ref, i)));
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local[i] = agg;
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}
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sh_scratch[gl_LocalInvocationID.x] = agg;
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for (uint i = 0; i < LG_WG_SIZE; i++) {
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barrier();
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if (gl_LocalInvocationID.x >= (1u << i)) {
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Monoid other = sh_scratch[gl_LocalInvocationID.x - (1u << i)];
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agg = combine_monoid(other, agg);
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}
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barrier();
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sh_scratch[gl_LocalInvocationID.x] = agg;
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}
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barrier();
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Monoid row = monoid_identity();
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if (gl_WorkGroupID.x > 0) {
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row = parent[gl_WorkGroupID.x - 1];
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}
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if (gl_LocalInvocationID.x > 0) {
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row = combine_monoid(row, sh_scratch[gl_LocalInvocationID.x - 1]);
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}
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for (uint i = 0; i < N_ROWS; i++) {
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Monoid m = combine_monoid(row, local[i]);
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TransformSeg transform = TransformSeg(m.mat, m.translate);
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TransformSegRef trans_ref = TransformSegRef(conf.trans_alloc.offset + (ix + i) * TransformSeg_size);
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TransformSeg_write(conf.trans_alloc, trans_ref, transform);
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}
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}
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