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Avoid a wgpu SPIR-V warning about BitFieldUExtract

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premultiply-alpha-vert.glsl contains a function unpack() which, without this
change, causes the following warnings:

WARN wgpu_core::device: Failed to parse shader SPIR-V code for Some("premultiply-alpha-vert.glsl …"): UnsupportedInstruction(Function, BitFieldUExtract)
WARN wgpu_core::device:     Proceeding unsafely without validation

This avoids that warning (and removes now-unnecessary type conversions).
This commit is contained in:
Darren Salt 2023-12-23 14:27:43 +00:00
parent 448e1ba64a
commit dc0725e104
1 changed files with 5 additions and 8 deletions
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13
assets/voxygen/shaders/premultiply-alpha-vert.glsl
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@ -13,17 +13,14 @@ layout(push_constant) uniform Params {
layout(location = 0) out vec2 source_coords;
uvec2 unpack(uint xy) {
return uvec2(
bitfieldExtract(xy, 0, 16),
bitfieldExtract(xy, 16, 16)
);
vec2 unpack(uint xy) {
return vec2(xy & 0xFFFF, (xy >> 16) & 0xFFFF);
}
void main() {
vec2 source_size = vec2(unpack(source_size_xy));
vec2 target_offset = vec2(unpack(target_offset_xy));
vec2 target_size = vec2(unpack(target_size_xy));
vec2 source_size = unpack(source_size_xy);
vec2 target_offset = unpack(target_offset_xy);
vec2 target_size = unpack(target_size_xy);
// Generate rectangle (counter clockwise triangles)
//