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

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• Hash : fbb1c792
  Author :
  Date : 2018-01-19T16:26:59
  

  Store symbol names as a ImmutableString
  
  This will enable compile-time initialization of built-in symbols as
  well as reducing copying strings.
  
  Most of the code that deals with names is changed to use
  ImmutableString where it makes sense to avoid conversions.
  
  The lexer/parser now allocate const char pointers into pool memory
  instead of allocating TStrings. These are then converted to
  ImmutableString upon entering TParseContext.
  
  BUG=angleproject:2267
  TEST=angle_unittests, angle_end2end_tests
  
  Change-Id: I244d6271ea1ecf7150d4f89dfa388a7745a1150c
  Reviewed-on: https://chromium-review.googlesource.com/881561
  Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  

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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, ImmutableString("gl_PointSize")))
      {
          return;
      }
  
      TIntermSymbol *pointSizeNode =
          ReferenceBuiltInVariable(ImmutableString("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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