diff options
Diffstat (limited to 'src/3rdparty/angle/src/compiler/translator/ClampPointSize.cpp')
-rw-r--r-- | src/3rdparty/angle/src/compiler/translator/ClampPointSize.cpp | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/src/3rdparty/angle/src/compiler/translator/ClampPointSize.cpp b/src/3rdparty/angle/src/compiler/translator/ClampPointSize.cpp new file mode 100644 index 0000000000..8598a137f5 --- /dev/null +++ b/src/3rdparty/angle/src/compiler/translator/ClampPointSize.cpp @@ -0,0 +1,47 @@ +// +// 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 |