Callable shader fix and explicit payload locations for GLSL (#2185)

* Fixed the callable shader payload type for GLSL.

* Added location parameters to the __vulkanRayPayload and __vulkanCallablePayload attributes.
The default value is -1 which means use the old auto-assignment logic.

* Fixed the vkray/callable-caller test.

1 files changed, 18 insertions, 0 deletions

diff --git a/source/slang/slang-check-modifier.cpp b/source/slang/slang-check-modifier.cpp
index e597407e2..320b980e9 100644
--- a/source/slang/slang-check-modifier.cpp
+++ b/source/slang/slang-check-modifier.cpp
@@ -539,6 +539,24 @@ namespace Slang
             }
             dllImportAttr->modulePath = libraryName;
         }
+        else if (auto rayPayloadAttr = as<VulkanRayPayloadAttribute>(attr))
+        {
+            SLANG_ASSERT(attr->args.getCount() == 1);
+            auto val = checkConstantIntVal(attr->args[0]);
+
+            if (!val) return false;
+
+            rayPayloadAttr->location = (int32_t)val->value;
+        }
+        else if (auto callablePayloadAttr = as<VulkanCallablePayloadAttribute>(attr))
+        {
+            SLANG_ASSERT(attr->args.getCount() == 1);
+            auto val = checkConstantIntVal(attr->args[0]);
+
+            if (!val) return false;
+
+            callablePayloadAttr->location = (int32_t)val->value;
+        }
         else
         {
             if(attr->args.getCount() == 0)