From 69cb6e8f300d77e74bd2c7dfe15d12e10b38f512 Mon Sep 17 00:00:00 2001
From: Alexey Panteleev <alpanteleev@nvidia.com>
Date: Wed, 18 May 2022 10:57:37 -0700
Subject: Support for querying which parameters are used in emitted code
 (#2239)

See https://github.com/shader-slang/slang/issues/2213
---
 slang.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'slang.h')

diff --git a/slang.h b/slang.h
index a2623bdd3..d08c6be34 100644
--- a/slang.h
+++ b/slang.h
@@ -1355,6 +1355,10 @@ extern "C"
         SlangCompileRequest*    request,
         SlangCompileFlags       flags);
 
+    /*! @see slang::ICompileRequest::getCompileFlags */
+    SLANG_API SlangCompileFlags spGetCompileFlags(
+        SlangCompileRequest*    request);
+
     /*! @see slang::ICompileRequest::setDumpIntermediates */
     SLANG_API void spSetDumpIntermediates(
         SlangCompileRequest*    request,
@@ -2147,6 +2151,15 @@ extern "C"
     SLANG_API unsigned spReflectionParameter_GetBindingIndex(SlangReflectionParameter* parameter);
     SLANG_API unsigned spReflectionParameter_GetBindingSpace(SlangReflectionParameter* parameter);
 
+    SLANG_API SlangResult spIsParameterLocationUsed(
+        SlangCompileRequest* request,
+        SlangInt entryPointIndex,
+        SlangInt targetIndex,
+        SlangParameterCategory category, // is this a `t` register? `s` register?
+        SlangUInt spaceIndex,      // `space` for D3D12, `set` for Vulkan
+        SlangUInt registerIndex,   // `register` for D3D12, `binding` for Vulkan
+        bool& outUsed);
+
     // Entry Point Reflection
 
     SLANG_API char const* spReflectionEntryPoint_getName(
@@ -3370,6 +3383,11 @@ namespace slang
         virtual SLANG_NO_THROW void SLANG_MCALL setCompileFlags(
             SlangCompileFlags       flags) = 0;
 
+            /*!
+            @brief Returns the compilation flags previously set with `setCompileFlags`
+            */
+        virtual SLANG_NO_THROW SlangCompileFlags SLANG_MCALL getCompileFlags() = 0;
+
             /*!
             @brief Set whether to dump intermediate results (for debugging) or not.
             */
@@ -3892,6 +3910,14 @@ namespace slang
         virtual SLANG_NO_THROW SlangResult SLANG_MCALL getProgramWithEntryPoints(
             slang::IComponentType** outProgram) = 0;
 
+        virtual SLANG_NO_THROW SlangResult SLANG_MCALL isParameterLocationUsed(
+            SlangInt entryPointIndex,
+            SlangInt targetIndex,
+            SlangParameterCategory category,
+            SlangUInt spaceIndex,
+            SlangUInt registerIndex,
+            bool& outUsed) = 0;
+
             /** Set the line directive mode for a target.
             */
         virtual SLANG_NO_THROW void SLANG_MCALL setTargetLineDirectiveMode(
-- 
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