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

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• Hash : e8923a62
  Author :
  Date : 2023-11-14T00:00:00
  

  Clamp gl_PointSize to both bounds
  
  Ensure that point size values smaller than
  ALIASED_POINT_SIZE_RANGE[0] are clamped as
  the spec requires.
  
  Fixed: angleproject:8416
  Change-Id: I3cfd2b1d3c1f34788d062ff4ca4b809ce3b5aaa9
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5033198
  Commit-Queue: Alexey Knyazev <lexa.knyazev@gmail.com>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• 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 minPointSize,
                      float maxPointSize,
                      TSymbolTable *symbolTable)
  {
      // Only clamp gl_PointSize if it's used in the shader.
      const TIntermSymbol *glPointSize = FindSymbolNode(root, ImmutableString("gl_PointSize"));
      if (glPointSize == nullptr)
      {
          return true;
      }
  
      TIntermTyped *pointSizeNode = glPointSize->deepCopy();
  
      TConstantUnion *minPointSizeConstant = new TConstantUnion();
      TConstantUnion *maxPointSizeConstant = new TConstantUnion();
      minPointSizeConstant->setFConst(minPointSize);
      maxPointSizeConstant->setFConst(maxPointSize);
      TIntermConstantUnion *minPointSizeNode =
          new TIntermConstantUnion(minPointSizeConstant, TType(EbtFloat, EbpHigh, EvqConst));
      TIntermConstantUnion *maxPointSizeNode =
          new TIntermConstantUnion(maxPointSizeConstant, TType(EbtFloat, EbpHigh, EvqConst));
  
      // clamp(gl_PointSize, minPointSize, maxPointSize)
      TIntermSequence clampArguments;
      clampArguments.push_back(pointSizeNode->deepCopy());
      clampArguments.push_back(minPointSizeNode);
      clampArguments.push_back(maxPointSizeNode);
      TIntermTyped *clampedPointSize =
          CreateBuiltInFunctionCallNode("clamp", &clampArguments, *symbolTable, 100);
  
      // gl_PointSize = clamp(gl_PointSize, minPointSize, maxPointSize)
      TIntermBinary *assignPointSize = new TIntermBinary(EOpAssign, pointSizeNode, clampedPointSize);
  
      return RunAtTheEndOfShader(compiler, root, assignPointSize, symbolTable);
  }
  
  }  // namespace sh
  

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