kc3-lang/angle/src/tests/perf_tests/PreRotationPerf.cpp

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• Hash : 7cdda2dc
  Author :
  Date : 2021-01-07T16:46:54
  

  Vulkan: Add a perf test for pre-rotation code injection
  
  A test is added that dispatches a large number of vertex shaders,
  generating primitives that are all culled.  The vertex shaders are
  simple so that code injected for pre-rotation would make up the majority
  of the shader code.
  
  Bug: angleproject:5478
  Change-Id: I75092cb25e6427449251985f56e54f89813dec32
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2615821
  Reviewed-by: Charlie Lao <cclao@google.com>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• src/tests/perf_tests/PreRotationPerf.cpp

• //
  // Copyright 2020 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.
  //
  // PreRotationBenchmark:
  //   Performance test for pre-rotation code generation.
  //
  
  #include "ANGLEPerfTest.h"
  
  #include <iostream>
  #include <random>
  #include <sstream>
  
  #include "test_utils/gl_raii.h"
  #include "util/shader_utils.h"
  
  using namespace angle;
  
  namespace
  {
  constexpr unsigned int kIterationsPerStep = 20;
  
  enum class PreRotation
  {
      _0,
      _90,
      _180,
      _270,
  };
  
  struct PreRotationParams final : public RenderTestParams
  {
      PreRotationParams()
      {
          iterationsPerStep = kIterationsPerStep;
          trackGpuTime      = true;
  
          preRotation = PreRotation::_0;
      }
  
      std::string story() const override;
  
      PreRotation preRotation;
  };
  
  std::ostream &operator<<(std::ostream &os, const PreRotationParams &params)
  {
      return os << params.backendAndStory().substr(1);
  }
  
  std::string PreRotationParams::story() const
  {
      std::stringstream strstr;
  
      strstr << RenderTestParams::story();
  
      switch (preRotation)
      {
          case PreRotation::_0:
              strstr << "_NoPreRotation";
              break;
          case PreRotation::_90:
              strstr << "_PreRotate90";
              break;
          case PreRotation::_180:
              strstr << "_PreRotate180";
              break;
          case PreRotation::_270:
              strstr << "_PreRotate270";
              break;
      }
  
      return strstr.str();
  }
  
  class PreRotationBenchmark : public ANGLERenderTest,
                               public ::testing::WithParamInterface<PreRotationParams>
  {
    public:
      PreRotationBenchmark();
  
      void initializeBenchmark() override;
      void destroyBenchmark() override;
  
      void drawBenchmark() override;
  
    protected:
      GLuint mProgram = 0;
  };
  
  PreRotationBenchmark::PreRotationBenchmark() : ANGLERenderTest("PreRotation", GetParam()) {}
  
  void PreRotationBenchmark::initializeBenchmark()
  {
      constexpr char kVS[] = R"(
  attribute mediump vec4 positionIn;
  void main()
  {
      gl_Position = positionIn;
  })";
  
      constexpr char kFS[] = R"(precision mediump float;
  void main()
  {
      gl_FragColor = vec4(0);
  })";
  
      mProgram = CompileProgram(kVS, kFS);
      ASSERT_NE(0u, mProgram);
  
      glUseProgram(mProgram);
  
      ASSERT_GL_NO_ERROR();
  
      glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
      glViewport(0, 0, getWindow()->getWidth(), getWindow()->getHeight());
  
      // Perform a draw so everything is flushed.
      glDrawArrays(GL_TRIANGLES, 0, 3);
  
      ASSERT_GL_NO_ERROR();
  }
  
  void PreRotationBenchmark::destroyBenchmark()
  {
      glDeleteProgram(mProgram);
  }
  
  void PreRotationBenchmark::drawBenchmark()
  {
      const auto &params = GetParam();
  
      constexpr uint32_t kDrawCallSize = 100'000;
  
      GLint attribLocation = glGetAttribLocation(mProgram, "positionIn");
      ASSERT_NE(-1, attribLocation);
  
      startGpuTimer();
      for (unsigned int iteration = 0; iteration < params.iterationsPerStep; ++iteration)
      {
          // Set the position attribute such that every generated primitive is out of bounds and is
          // clipped.  This means the test is spending its time almost entirely with vertex shaders.
          // The vertex shader itself is simple so that any code that is added for pre-rotation will
          // contribute a comparably sizable chunk of code.
          switch (iteration % 5)
          {
              case 0:
                  glVertexAttrib4f(attribLocation, -2.0f, 0.0f, 0.0f, 1.0f);
                  break;
              case 1:
                  glVertexAttrib4f(attribLocation, 2.0f, 0.0f, 0.0f, 1.0f);
                  break;
              case 2:
                  glVertexAttrib4f(attribLocation, 0.0f, -2.0f, 0.0f, 1.0f);
                  break;
              case 3:
                  glVertexAttrib4f(attribLocation, 0.0f, 2.0f, 0.0f, 1.0f);
                  break;
              case 4:
                  glVertexAttrib4f(attribLocation, 0.0f, 0.0f, -2.0f, 1.0f);
                  break;
          }
  
          // Draw many points, all which are culled.
          glDrawArrays(GL_POINTS, 0, kDrawCallSize);
      }
      stopGpuTimer();
  
      ASSERT_GL_NO_ERROR();
  }
  
  PreRotationParams VulkanParams(PreRotation preRotation)
  {
      PreRotationParams params;
      params.eglParameters = egl_platform::VULKAN();
      params.preRotation   = preRotation;
  
      switch (preRotation)
      {
          case PreRotation::_0:
              break;
          case PreRotation::_90:
              params.eglParameters.emulatedPrerotation = 90;
              break;
          case PreRotation::_180:
              params.eglParameters.emulatedPrerotation = 180;
              break;
          case PreRotation::_270:
              params.eglParameters.emulatedPrerotation = 270;
              break;
      }
  
      return params;
  }
  
  }  // anonymous namespace
  
  TEST_P(PreRotationBenchmark, Run)
  {
      run();
  }
  
  using namespace params;
  
  ANGLE_INSTANTIATE_TEST(PreRotationBenchmark,
                         VulkanParams(PreRotation::_0),
                         VulkanParams(PreRotation::_90),
                         VulkanParams(PreRotation::_180),
                         VulkanParams(PreRotation::_270));
  

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