From 5a0224a0773f6d7f5eae8515424af5fa8faa9c14 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Thu, 26 Sep 2024 09:44:08 -0700
Subject: Move texture format inference to frontend and add reflection api for
 it. (#5155)

---
 source/slang/slang-ir-resolve-texture-format.cpp | 142 +++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 source/slang/slang-ir-resolve-texture-format.cpp

(limited to 'source/slang/slang-ir-resolve-texture-format.cpp')

diff --git a/source/slang/slang-ir-resolve-texture-format.cpp b/source/slang/slang-ir-resolve-texture-format.cpp
new file mode 100644
index 000000000..7cd81fc2d
--- /dev/null
+++ b/source/slang/slang-ir-resolve-texture-format.cpp
@@ -0,0 +1,142 @@
+#include "slang-ir-resolve-texture-format.h"
+#include "slang-ir-insts.h"
+#include "slang-ir-clone.h"
+
+namespace Slang
+{
+    static IRType* replaceImageElementType(IRInst* originalType, IRInst* newElementType)
+    {
+        switch (originalType->getOp())
+        {
+        case kIROp_ArrayType:
+        case kIROp_UnsizedArrayType:
+        case kIROp_PtrType:
+        case kIROp_OutType:
+        case kIROp_RefType:
+        case kIROp_ConstRefType:
+        case kIROp_InOutType:
+        {
+            auto newInnerType = replaceImageElementType(originalType->getOperand(0), newElementType);
+            if (newInnerType != originalType->getOperand(0))
+            {
+                IRBuilder builder(originalType);
+                builder.setInsertBefore(originalType);
+                IRCloneEnv cloneEnv;
+                cloneEnv.mapOldValToNew.add(originalType->getOperand(0), newInnerType);
+                return (IRType*)cloneInst(&cloneEnv, &builder, originalType);
+            }
+            return (IRType*)originalType;
+        }
+
+        default:
+            if (as<IRResourceTypeBase>(originalType))
+                return (IRType*)newElementType;
+            return (IRType*)originalType;
+        }
+    }
+
+    static void resolveTextureFormatForParameter(IRInst* textureInst, IRTextureTypeBase* textureType)
+    {
+        ImageFormat format = (ImageFormat)(textureType->getFormat());
+        auto decor = textureInst->findDecoration<IRFormatDecoration>();
+        if (!decor)
+            return;
+        if (decor->getFormat() == (ImageFormat)textureType->getFormat())
+            return;
+
+        format = decor->getFormat();
+        if (format != ImageFormat::unknown)
+        {
+            IRBuilder builder(textureInst->getModule());
+            builder.setInsertBefore(textureInst);
+            auto formatArg = builder.getIntValue(builder.getUIntType(), IRIntegerValue(format));
+
+            auto newType = builder.getTextureType(
+                textureType->getElementType(),
+                textureType->getShapeInst(),
+                textureType->getIsArrayInst(),
+                textureType->getIsMultisampleInst(),
+                textureType->getSampleCountInst(),
+                textureType->getAccessInst(),
+                textureType->getIsShadowInst(),
+                textureType->getIsCombinedInst(),
+                formatArg);
+
+            List<IRUse*> typeReplacementWorkList;
+            HashSet<IRUse*> typeReplacementWorkListSet;
+
+            auto newInstType = (IRType*)replaceImageElementType(textureInst->getFullType(), newType);
+            textureInst->setFullType(newInstType);
+          
+            for (auto use = textureInst->firstUse; use; use = use->nextUse)
+            {
+                if (typeReplacementWorkListSet.add(use))
+                    typeReplacementWorkList.add(use);
+            }
+
+            // Update the types on dependent insts.
+            for (Index i = 0; i < typeReplacementWorkList.getCount(); i++)
+            {
+                auto use = typeReplacementWorkList[i];
+                auto user = use->getUser();
+                switch (user->getOp())
+                {
+                case kIROp_GetElementPtr:
+                case kIROp_GetElement:
+                case kIROp_Load:
+                case kIROp_Var:
+                {
+                    auto newUserType = (IRType*)replaceImageElementType(user->getFullType(), newType);
+                    if (newUserType != user->getFullType())
+                    {
+                        user->setFullType(newUserType);
+                        for (auto u = user->firstUse; u; u = u->nextUse)
+                        {
+                            if (typeReplacementWorkListSet.add(u))
+                                typeReplacementWorkList.add(u);
+                        }
+                    }
+                    break;
+                }
+                case kIROp_Store:
+                {
+                    auto store = as<IRStore>(user);
+                    if (use == store->getValUse())
+                    {
+                        auto ptr = store->getPtr();
+                        auto newPtrType = (IRType*)replaceImageElementType(ptr->getFullType(), newType);
+                        if (newPtrType != ptr->getFullType())
+                        {
+                            ptr->setFullType(newPtrType);
+                            for (auto u = ptr->firstUse; u; u = u->nextUse)
+                            {
+                                if (typeReplacementWorkListSet.add(u))
+                                    typeReplacementWorkList.add(u);
+                            }
+                        }
+                    }
+                    break;
+                }
+                }
+            }
+        }
+    }
+
+    void resolveTextureFormat(IRModule* module)
+    {
+        for (auto globalInst : module->getGlobalInsts())
+        {
+            if (as<IRTextureTypeBase>(globalInst->getDataType()))
+            {
+                resolveTextureFormatForParameter(globalInst, (IRTextureTypeBase*)globalInst->getDataType());
+            }
+            else if (auto arrayType = as<IRArrayTypeBase>(globalInst->getDataType()))
+            {
+                if (as<IRTextureTypeBase>(arrayType->getElementType()))
+                {
+                    resolveTextureFormatForParameter(globalInst, (IRTextureTypeBase*)arrayType->getElementType());
+                }
+            }
+        }
+    }
+}
-- 
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