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gpu/shaders: ensure dynamically uniform barriers when malloc fails

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GPU APIs require that barrier() calls are dynamically uniform, that is
for every barrier in the code, every shader invocation in a workgroup
must all call it, or all not call it.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2021-04-11 16:34:33 +02:00
parent f930e3f3d7
commit ee519351f7
9 changed files with 564 additions and 580 deletions
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gpu/shaders/backdrop.comp
+3 -6
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@@ -35,16 +35,13 @@ shared Alloc sh_row_alloc[BACKDROP_WG];
shared uint sh_row_width[BACKDROP_WG];
void main() {
if (mem_error != NO_ERROR) {
return;
}
uint th_ix = gl_LocalInvocationID.x;
uint element_ix = gl_GlobalInvocationID.x;
AnnotatedRef ref = AnnotatedRef(conf.anno_alloc.offset + element_ix * Annotated_size);
// Work assignment: 1 thread : 1 path element
uint row_count = 0;
bool mem_ok = mem_error == NO_ERROR;
if (element_ix < conf.n_elements) {
AnnotatedTag tag = Annotated_tag(conf.anno_alloc, ref);
switch (tag.tag) {
@@ -67,7 +64,7 @@ void main() {
// long as it doesn't cross the left edge.
row_count = 0;
}
Alloc path_alloc = new_alloc(path.tiles.offset, (path.bbox.z - path.bbox.x) * (path.bbox.w - path.bbox.y) * Tile_size);
Alloc path_alloc = new_alloc(path.tiles.offset, (path.bbox.z - path.bbox.x) * (path.bbox.w - path.bbox.y) * Tile_size, mem_ok);
sh_row_alloc[th_ix] = path_alloc;
}
}
@@ -95,7 +92,7 @@ void main() {
}
}
uint width = sh_row_width[el_ix];
if (width > 0) {
if (width > 0 && mem_ok) {
// Process one row sequentially
// Read backdrop value per tile and prefix sum it
Alloc tiles_alloc = sh_row_alloc[el_ix];