Add option to use original entrypoint in spirv output. (#3047)

* Add option to use original entrypoint in spirv output.

* Fix.

---------

Co-authored-by: Yong He <yhe@nvidia.com>

3 files changed, 27 insertions, 4 deletions

diff --git a/source/slang/slang-compiler.cpp b/source/slang/slang-compiler.cpp
index 4e1ab8e98..12e96d7bb 100644
--- a/source/slang/slang-compiler.cpp
+++ b/source/slang/slang-compiler.cpp
@@ -1222,11 +1222,18 @@ namespace Slang
                 auto entryPoint = getEntryPoint(entryPointIndex);
                 profile = getEffectiveProfile(entryPoint, targetReq);
 
-                options.entryPointName = allocator.allocate(getText(entryPoint->getName()));
-                auto entryPointNameOverride = getProgram()->getEntryPointNameOverride(entryPointIndex);
-                if (entryPointNameOverride.getLength() != 0)
+                if (getTargetReq()->getHLSLToVulkanLayoutOptions() && !getTargetReq()->getHLSLToVulkanLayoutOptions()->getUseOriginalEntryPointName())
                 {
-                    options.entryPointName = allocator.allocate(entryPointNameOverride);
+                }
+                else
+                {
+
+                    options.entryPointName = allocator.allocate(getText(entryPoint->getName()));
+                    auto entryPointNameOverride = getProgram()->getEntryPointNameOverride(entryPointIndex);
+                    if (entryPointNameOverride.getLength() != 0)
+                    {
+                        options.entryPointName = allocator.allocate(entryPointNameOverride);
+                    }
                 }
             }
             else 
diff --git a/source/slang/slang-hlsl-to-vulkan-layout-options.h b/source/slang/slang-hlsl-to-vulkan-layout-options.h
index 4ae169d90..2d24dfccb 100644
--- a/source/slang/slang-hlsl-to-vulkan-layout-options.h
+++ b/source/slang/slang-hlsl-to-vulkan-layout-options.h
@@ -119,6 +119,8 @@ public:
         /// True if the compiler should invert the Y coordinate of any SV_Position output.
     bool shouldInvertY() const { return m_invertY; }
 
+    bool getUseOriginalEntryPointName() const { return m_useOriginalEntryPointName; }
+
         /// Given an kind and a binding infer the vulkan binding.
         /// Will return an invalid binding if one is not found
     Binding inferBinding(Kind kind, const Binding& inBinding) const;
@@ -145,6 +147,8 @@ public:
 
     void setInvertY(bool value) { m_invertY = value; }
 
+    void setUseOriginalEntryPointName(bool value) { m_useOriginalEntryPointName = value; }
+
         /// Ctor
     HLSLToVulkanLayoutOptions();
     
@@ -171,6 +175,9 @@ protected:
 
         /// Whether to invert the Y coordinate of SV_Position output.
     bool m_invertY = false;
+
+        /// If set, will use the original entry point name in the generated SPIRV instead of "main".
+    bool m_useOriginalEntryPointName = false;
 };
 
 } // namespace Slang
diff --git a/source/slang/slang-options.cpp b/source/slang/slang-options.cpp
index e59109b37..b31a502e7 100644
--- a/source/slang/slang-options.cpp
+++ b/source/slang/slang-options.cpp
@@ -93,6 +93,8 @@ enum class OptionKind
     VulkanBindShift,
     VulkanBindGlobals,
     VulkanInvertY,
+    VulkanUseEntryPointName,
+
 
     GLSLForceScalarLayout,
     EnableEffectAnnotations,
@@ -498,6 +500,7 @@ void initCommandOptions(CommandOptions& options)
         { OptionKind::VulkanBindGlobals, "-fvk-bind-globals", "-fvk-bind-globals <N> <descriptor-set>",
         "Places the $Globals cbuffer at descriptor set <descriptor-set> and binding <N>."},
         { OptionKind::VulkanInvertY, "-fvk-invert-y", nullptr, "Negates (additively inverts) SV_Position.y before writing to stage output."},
+        { OptionKind::VulkanUseEntryPointName, "-fvk-use-entrypoint-name", nullptr, "Uses the entrypoint name from the source instead of 'main' in the spirv output."},
         { OptionKind::EnableEffectAnnotations,
          "-enable-effect-annotations", nullptr, 
          "Enables support for legacy effect annotation syntax."},
@@ -2016,6 +2019,12 @@ SlangResult OptionsParser::_parse(
                 m_hlslToVulkanLayoutOptions->setInvertY(true);
                 break;
             }
+            case OptionKind::VulkanUseEntryPointName:
+            {
+                // -fvk-use-entrypoint-name
+                m_hlslToVulkanLayoutOptions->setUseOriginalEntryPointName(true);
+                break;
+            }
             case OptionKind::Profile: SLANG_RETURN_ON_FAIL(_parseProfile(arg)); break;
             case OptionKind::Capability:
             {