kc3-lang/angle/src/tests/compiler_tests/RemovePow_test.cpp

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• Author : Stuart Morgan
  Date : 2019-08-14 12:25:12
  Hash : 9d737966
  Message : Standardize copyright notices to project style For all "ANGLE Project" copyrights, standardize to the format specified by the style guide. Changes: - "Copyright (c)" and "Copyright(c)" changed to just "Copyright". - Removed the second half of date ranges ("Y1Y1-Y2Y2"->"Y1Y1"). - Fixed a small number of files that had no copyright date using the initial commit year from the version control history. - Fixed one instance of copyright being "The ANGLE Project" rather than "The ANGLE Project Authors" These changes are applied both to the copyright of source file, and where applicable to copyright statements that are generated by templates. BUG=angleproject:3811 Change-Id: I973dd65e4ef9deeba232d5be74c768256a0eb2e5 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1754397 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>

• src/tests/compiler_tests/RemovePow_test.cpp

• //
  // Copyright 2015 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.
  //
  // RemovePow_test.cpp:
  //   Tests for removing pow() function calls from the AST.
  //
  
  #include "GLSLANG/ShaderLang.h"
  #include "angle_gl.h"
  #include "compiler/translator/TranslatorGLSL.h"
  #include "compiler/translator/tree_util/NodeSearch.h"
  #include "gtest/gtest.h"
  
  using namespace sh;
  
  class RemovePowTest : public testing::Test
  {
    public:
      RemovePowTest() {}
  
    protected:
      void SetUp() override
      {
          allocator.push();
          SetGlobalPoolAllocator(&allocator);
          ShBuiltInResources resources;
          sh::InitBuiltInResources(&resources);
          mTranslatorGLSL =
              new sh::TranslatorGLSL(GL_FRAGMENT_SHADER, SH_GLES2_SPEC, SH_GLSL_COMPATIBILITY_OUTPUT);
          ASSERT_TRUE(mTranslatorGLSL->Init(resources));
      }
  
      void TearDown() override
      {
          SafeDelete(mTranslatorGLSL);
          SetGlobalPoolAllocator(nullptr);
          allocator.pop();
      }
  
      void compile(const std::string &shaderString)
      {
          const char *shaderStrings[] = {shaderString.c_str()};
          mASTRoot                    = mTranslatorGLSL->compileTreeForTesting(
              shaderStrings, 1, SH_OBJECT_CODE | SH_REMOVE_POW_WITH_CONSTANT_EXPONENT);
          if (!mASTRoot)
          {
              TInfoSink &infoSink = mTranslatorGLSL->getInfoSink();
              FAIL() << "Shader compilation into ESSL failed " << infoSink.info.c_str();
          }
      }
  
      template <class T>
      bool foundInAST()
      {
          return T::search(mASTRoot);
      }
  
    private:
      sh::TranslatorGLSL *mTranslatorGLSL;
      TIntermNode *mASTRoot;
  
      angle::PoolAllocator allocator;
  };
  
  // Check if there's a pow() node anywhere in the tree.
  class FindPow : public sh::NodeSearchTraverser<FindPow>
  {
    public:
      bool visitBinary(Visit visit, TIntermBinary *node) override
      {
          if (node->getOp() == EOpPow)
          {
              mFound = true;
          }
          return !mFound;
      }
  };
  
  // Check if the tree starting at node corresponds to exp2(y * log2(x))
  // If the tree matches, set base to the node corresponding to x.
  bool IsPowWorkaround(TIntermNode *node, TIntermNode **base)
  {
      TIntermUnary *exp = node->getAsUnaryNode();
      if (exp != nullptr && exp->getOp() == EOpExp2)
      {
          TIntermBinary *mul = exp->getOperand()->getAsBinaryNode();
          if (mul != nullptr && mul->isMultiplication())
          {
              TIntermUnary *log = mul->getRight()->getAsUnaryNode();
              if (mul->getLeft()->getAsConstantUnion() && log != nullptr)
              {
                  if (log->getOp() == EOpLog2)
                  {
                      if (base)
                          *base = log->getOperand();
                      return true;
                  }
              }
          }
      }
      return false;
  }
  
  // Check if there's a node with the correct workaround to pow anywhere in the tree.
  class FindPowWorkaround : public sh::NodeSearchTraverser<FindPowWorkaround>
  {
    public:
      bool visitUnary(Visit visit, TIntermUnary *node) override
      {
          mFound = IsPowWorkaround(node, nullptr);
          return !mFound;
      }
  };
  
  // Check if there's a node with the correct workaround to pow with another workaround to pow
  // nested within it anywhere in the tree.
  class FindNestedPowWorkaround : public sh::NodeSearchTraverser<FindNestedPowWorkaround>
  {
    public:
      bool visitUnary(Visit visit, TIntermUnary *node) override
      {
          TIntermNode *base = nullptr;
          bool oneFound     = IsPowWorkaround(node, &base);
          if (oneFound && base)
              mFound = IsPowWorkaround(base, nullptr);
          return !mFound;
      }
  };
  
  TEST_F(RemovePowTest, PowWithConstantExponent)
  {
      const std::string &shaderString =
          "precision mediump float;\n"
          "uniform float u;\n"
          "void main() {\n"
          "   gl_FragColor = pow(vec4(u), vec4(0.5));\n"
          "}\n";
      compile(shaderString);
      ASSERT_FALSE(foundInAST<FindPow>());
      ASSERT_TRUE(foundInAST<FindPowWorkaround>());
      ASSERT_FALSE(foundInAST<FindNestedPowWorkaround>());
  }
  
  TEST_F(RemovePowTest, NestedPowWithConstantExponent)
  {
      const std::string &shaderString =
          "precision mediump float;\n"
          "uniform float u;\n"
          "void main() {\n"
          "   gl_FragColor = pow(pow(vec4(u), vec4(2.0)), vec4(0.5));\n"
          "}\n";
      compile(shaderString);
      ASSERT_FALSE(foundInAST<FindPow>());
      ASSERT_TRUE(foundInAST<FindNestedPowWorkaround>());
  }