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//
// Copyright 2020 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/tree_ops/ForcePrecisionQualifier.h"
#include "angle_gl.h"
#include "common/debug.h"
#include "compiler/translator/Compiler.h"
#include "compiler/translator/tree_util/IntermTraverse.h"
#include "compiler/translator/util.h"
namespace sh
{
namespace
{
class TPrecisionTraverser : public TIntermTraverser
{
public:
TPrecisionTraverser(TSymbolTable *symbolTable);
protected:
bool visitDeclaration(Visit visit, TIntermDeclaration *node) override;
void overwriteVariablePrecision(TType *type) const;
};
TPrecisionTraverser::TPrecisionTraverser(TSymbolTable *symbolTable)
: TIntermTraverser(true, true, true, symbolTable)
{}
void TPrecisionTraverser::overwriteVariablePrecision(TType *type) const
{
if (type->getPrecision() == EbpHigh)
{
type->setPrecision(EbpMedium);
}
}
bool TPrecisionTraverser::visitDeclaration(Visit visit, TIntermDeclaration *node)
{
// Variable declaration.
if (visit == PreVisit)
{
const TIntermSequence &sequence = *(node->getSequence());
TIntermTyped *variable = sequence.front()->getAsTyped();
const TType &type = variable->getType();
TQualifier qualifier = variable->getQualifier();
// Don't modify uniform since it might be shared between vertex and fragment shader
if (qualifier == EvqUniform)
{
return true;
}
// Visit the struct.
if (type.isStructSpecifier())
{
const TStructure *structure = type.getStruct();
const TFieldList &fields = structure->fields();
for (size_t i = 0; i < fields.size(); ++i)
{
const TField *field = fields[i];
const TType *fieldType = field->type();
overwriteVariablePrecision((TType *)fieldType);
}
}
else if (type.getBasicType() == EbtInterfaceBlock)
{
const TInterfaceBlock *interfaceBlock = type.getInterfaceBlock();
const TFieldList &fields = interfaceBlock->fields();
for (const TField *field : fields)
{
const TType *fieldType = field->type();
overwriteVariablePrecision((TType *)fieldType);
}
}
else
{
overwriteVariablePrecision((TType *)&type);
}
}
return true;
}
} // namespace
bool ForceShaderPrecisionToMediump(TIntermNode *root, TSymbolTable *symbolTable, GLenum shaderType)
{
if (shaderType != GL_FRAGMENT_SHADER)
{
return true;
}
TPrecisionTraverser traverser(symbolTable);
root->traverse(&traverser);
return true;
}
} // namespace sh
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