Merge pull request #9800 from Techjar/vulkan-subgroup-fix

Vulkan: Fix subgroup reduction
dolphin-emu · Jun 8, 2021 · 1b39779 · 1b39779
2 parents ec8257e + 58238e7
commit 1b39779
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/Source/Core/VideoBackends/Vulkan/ShaderCompiler.cpp b/Source/Core/VideoBackends/Vulkan/ShaderCompiler.cpp
@@ -103,7 +103,7 @@ static const char SUBGROUP_HELPER_HEADER[] = R"(
   #define SUPPORTS_SUBGROUP_REDUCTION 1
   #define CAN_USE_SUBGROUP_REDUCTION true
   #define IS_HELPER_INVOCATION gl_HelperInvocation
-  #define IS_FIRST_ACTIVE_INVOCATION (gl_SubgroupInvocationID == subgroupBallotFindLSB(subgroupBallot(true)))
+  #define IS_FIRST_ACTIVE_INVOCATION (gl_SubgroupInvocationID == subgroupBallotFindLSB(subgroupBallot(!gl_HelperInvocation)))
   #define SUBGROUP_MIN(value) value = subgroupMin(value)
   #define SUBGROUP_MAX(value) value = subgroupMax(value)
 )";