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//
// Copyright 2019 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
#include "compiler/translator/BuiltinsWorkaroundGLSL.h"
#include "angle_gl.h"
#include "compiler/translator/Symbol.h"
#include "compiler/translator/SymbolTable.h"
#include "compiler/translator/tree_util/BuiltIn.h"
namespace sh
{
namespace
{
constexpr const ImmutableString kGlInstanceIDString("gl_InstanceID");
constexpr const ImmutableString kGlVertexIDString("gl_VertexID");
class TBuiltinsWorkaroundGLSL : public TIntermTraverser
{
public:
TBuiltinsWorkaroundGLSL(TSymbolTable *symbolTable, const ShCompileOptions &options);
void visitSymbol(TIntermSymbol *node) override;
bool visitDeclaration(Visit, TIntermDeclaration *node) override;
private:
void ensureVersionIsAtLeast(int version);
const ShCompileOptions &mCompileOptions;
bool isBaseInstanceDeclared = false;
};
TBuiltinsWorkaroundGLSL::TBuiltinsWorkaroundGLSL(TSymbolTable *symbolTable,
const ShCompileOptions &options)
: TIntermTraverser(true, false, false, symbolTable), mCompileOptions(options)
{}
void TBuiltinsWorkaroundGLSL::visitSymbol(TIntermSymbol *node)
{
if (node->variable().symbolType() == SymbolType::BuiltIn)
{
if (node->getName() == kGlInstanceIDString)
{
TIntermSymbol *instanceIndexRef =
new TIntermSymbol(BuiltInVariable::gl_InstanceIndex());
if (isBaseInstanceDeclared)
{
TIntermSymbol *baseInstanceRef =
new TIntermSymbol(BuiltInVariable::angle_BaseInstance());
TIntermBinary *subBaseInstance =
new TIntermBinary(EOpSub, instanceIndexRef, baseInstanceRef);
queueReplacement(subBaseInstance, OriginalNode::IS_DROPPED);
}
else
{
queueReplacement(instanceIndexRef, OriginalNode::IS_DROPPED);
}
}
else if (node->getName() == kGlVertexIDString)
{
TIntermSymbol *vertexIndexRef = new TIntermSymbol(BuiltInVariable::gl_VertexIndex());
queueReplacement(vertexIndexRef, OriginalNode::IS_DROPPED);
}
}
}
bool TBuiltinsWorkaroundGLSL::visitDeclaration(Visit, TIntermDeclaration *node)
{
const TIntermSequence &sequence = *(node->getSequence());
ASSERT(!sequence.empty());
for (TIntermNode *variableNode : sequence)
{
TIntermSymbol *variable = variableNode->getAsSymbolNode();
if (variable && variable->variable().symbolType() == SymbolType::BuiltIn)
{
if (variable->getName() == "angle_BaseInstance")
{
isBaseInstanceDeclared = true;
}
}
}
return true;
}
} // anonymous namespace
[[nodiscard]] bool ShaderBuiltinsWorkaround(TCompiler *compiler,
TIntermBlock *root,
TSymbolTable *symbolTable,
const ShCompileOptions &compileOptions)
{
TBuiltinsWorkaroundGLSL builtins(symbolTable, compileOptions);
root->traverse(&builtins);
if (!builtins.updateTree(compiler, root))
{
return false;
}
return true;
}
} // namespace sh
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