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//
// Copyright (c) 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/ClampPointSize.h"
#include "compiler/translator/FindSymbolNode.h"
#include "compiler/translator/IntermNode_util.h"
#include "compiler/translator/RunAtTheEndOfShader.h"
#include "compiler/translator/SymbolTable.h"
namespace sh
{
void ClampPointSize(TIntermBlock *root, float maxPointSize, TSymbolTable *symbolTable)
{
// Only clamp gl_PointSize if it's used in the shader.
if (!FindSymbolNode(root, TString("gl_PointSize"), EbtFloat))
{
return;
}
TIntermSymbol *pointSizeNode = ReferenceBuiltInVariable("gl_PointSize", *symbolTable, 100);
TConstantUnion *maxPointSizeConstant = new TConstantUnion();
maxPointSizeConstant->setFConst(maxPointSize);
TIntermConstantUnion *maxPointSizeNode =
new TIntermConstantUnion(maxPointSizeConstant, TType(EbtFloat, EbpHigh, EvqConst));
// min(gl_PointSize, maxPointSize)
TIntermSequence *minArguments = new TIntermSequence();
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);
RunAtTheEndOfShader(root, assignPointSize, symbolTable);
}
} // namespace sh
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