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//
// Copyright 2017 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.
//
// ClampPointSize.cpp: Limit the value that is written to gl_PointSize.
//
#include "compiler/translator/tree_ops/ClampPointSize.h"
#include "compiler/translator/SymbolTable.h"
#include "compiler/translator/tree_util/BuiltIn.h"
#include "compiler/translator/tree_util/FindSymbolNode.h"
#include "compiler/translator/tree_util/IntermNode_util.h"
#include "compiler/translator/tree_util/RunAtTheEndOfShader.h"
namespace sh
{
bool ClampPointSize(TCompiler *compiler,
TIntermBlock *root,
float maxPointSize,
TSymbolTable *symbolTable)
{
// Only clamp gl_PointSize if it's used in the shader.
const TIntermSymbol *glPointSize = FindSymbolNode(root, ImmutableString("gl_PointSize"));
if (glPointSize == nullptr)
{
return true;
}
TIntermTyped *pointSizeNode = glPointSize->deepCopy();
TConstantUnion *maxPointSizeConstant = new TConstantUnion();
maxPointSizeConstant->setFConst(maxPointSize);
TIntermConstantUnion *maxPointSizeNode =
new TIntermConstantUnion(maxPointSizeConstant, TType(EbtFloat, EbpHigh, EvqConst));
// min(gl_PointSize, maxPointSize)
TIntermSequence minArguments;
minArguments.push_back(pointSizeNode->deepCopy());
minArguments.push_back(maxPointSizeNode);
TIntermTyped *clampedPointSize =
CreateBuiltInFunctionCallNode("min", &minArguments, *symbolTable, 100);
// gl_PointSize = min(gl_PointSize, maxPointSize)
TIntermBinary *assignPointSize = new TIntermBinary(EOpAssign, pointSizeNode, clampedPointSize);
return RunAtTheEndOfShader(compiler, root, assignPointSize, symbolTable);
}
} // namespace sh
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