kc3-lang/angle/src/compiler/translator/ClampPointSize.cpp

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• Hash : 4728bdc8
  Author :
  Date : 2017-12-20T17:51:08
  

  Unify looking for symbols with a specific name in the AST
  
  Keep only one traverser for looking up symbol nodes by name instead
  of having two largely identical ones.
  
  BUG=angleproject:2267
  TEST=angle_unittests
  
  Change-Id: I36e906258180e22b7b1353cab79d90266d99fa0e
  Reviewed-on: https://chromium-review.googlesource.com/836895
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
  

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• src/compiler/translator/ClampPointSize.cpp

• //
  // 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")))
      {
          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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