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

• Show log

  Commit

• Hash : a07b4213
  Author :
  Date : 2018-03-22T16:13:13
  

  Move AST transformations to a subdirectory
  
  Move AST transformations to compiler/translator/tree_ops.
  
  BUG=angleproject:2409
  TEST=angle_unittests
  
  Change-Id: I9c620e98707d22d005da6192fe7d1b4e8030aadd
  Reviewed-on: https://chromium-review.googlesource.com/975550
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
  

Download

• src/compiler/translator/tree_ops/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/tree_ops/ClampPointSize.h"
  
  #include "compiler/translator/SymbolTable.h"
  #include "compiler/translator/tree_util/BuiltIn_autogen.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
  {
  
  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 = new TIntermSymbol(BuiltInVariable::gl_PointSize());
  
      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
  

Download