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Fix pixel shader input aliases

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This commit is contained in:
nmzik
2026-09-15 20:46:51 +04:00
parent 629ae1ac05
commit 441367b1a1
5 changed files with 174 additions and 10 deletions
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src/graphics/shader/shaderPixelParameter.cpp
+19 -7
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@@ -19,19 +19,31 @@ uint32_t ShaderPixelParameterLocation(const ShaderPixelInputInfo& info,
std::span<const uint32_t> active_inputs, uint32_t input) {
std::array<bool, 32> used_locations {};
for (const auto active_input: active_inputs) {
auto location = ShaderPixelParameterMappedLocation(info, active_input);
if (location < used_locations.size() && used_locations[location]) {
location = active_input;
while (location < used_locations.size() && used_locations[location]) {
location++;
used_locations[ShaderPixelParameterMappedLocation(info, active_input)] = true;
}
std::array<uint32_t, 64> group_locations;
group_locations.fill(UINT32_MAX);
for (const auto active_input: active_inputs) {
const auto mapped = ShaderPixelParameterMappedLocation(info, active_input);
const auto group = mapped * 2u + ShaderPixelParameterIsFlat(info, active_input);
auto& location = group_locations[group];
if (location == UINT32_MAX) {
location = mapped;
// Smooth and custom interpolation read the same vertex output. Only
// differing flat/smooth rectangle outputs need separate locations.
if (group_locations[group ^ 1u] != UINT32_MAX) {
location = 0;
while (location < used_locations.size() && used_locations[location]) {
location++;
}
EXIT_NOT_IMPLEMENTED(location >= used_locations.size());
}
EXIT_NOT_IMPLEMENTED(location >= used_locations.size());
used_locations[location] = true;
}
if (active_input == input) {
return location;
}
used_locations[location] = true;
}
return ShaderPixelParameterMappedLocation(info, input);
}