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

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• Author : Shahbaz Youssefi
  Date : 2021-01-19 12:38:46
  Hash : f0286e63
  Message : Translator: Stop allocating TIntermSequence The functions that take a TIntermSequence always copy out / Swap the contents away. This change makes all TIntermSequences live on the stack instead of being newed. Bug: angleproject:5535 Change-Id: I942f1c5e57b00199d5308183f71bd9e18b0608bd Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2636679 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>

• src/compiler/translator/tree_ops/ClampPointSize.cpp

• //
  // Copyright 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.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
  {
  
  bool ClampPointSize(TCompiler *compiler,
                      TIntermBlock *root,
                      float maxPointSize,
                      TSymbolTable *symbolTable)
  {
      // Only clamp gl_PointSize if it's used in the shader.
      if (!FindSymbolNode(root, ImmutableString("gl_PointSize")))
      {
          return true;
      }
  
      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;
      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);
  
      return RunAtTheEndOfShader(compiler, root, assignPointSize, symbolTable);
  }
  
  }  // namespace sh