kc3-lang/angle/src/libANGLE/VaryingPacking_unittest.cpp

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• Hash : 90a58622
  Author :
  Date : 2019-09-04T15:39:58
  

  Refactor ShaderVariable to Remove Specializations
  
  The following structs are being refactored and moved into the parent
  struct ShaderVariable:
  
  VariableWithLocation
  Uniform
  Attribute
  OutputVariable
  InterfaceBlockField
  Varying
  
  Bug: angleproject:3899
  Test: CQ
  Change-Id: I389eb3ab4ed44a360e09fca75ecc78d64a277f83
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1785877
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>
  Commit-Queue: Tim Van Patten <timvp@google.com>
  

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• src/libANGLE/VaryingPacking_unittest.cpp

• //
  // Copyright 2016 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.
  //
  // VaryingPacking_unittest.cpp:
  //   Tests for ANGLE's internal varying packing algorithm.
  //
  
  #include <gtest/gtest.h>
  // 'None' is defined as 'struct None {};' in
  // third_party/googletest/src/googletest/include/gtest/internal/gtest-type-util.h.
  // But 'None' is also define as a numberic constant 0L in <X11/X.h>.
  // So we need to include gtest first to avoid such conflict.
  
  #include "libANGLE/Program.h"
  #include "libANGLE/VaryingPacking.h"
  
  using namespace gl;
  
  namespace
  {
  
  class VaryingPackingTest : public ::testing::TestWithParam<GLuint>
  {
    protected:
      VaryingPackingTest() {}
  
      bool testVaryingPacking(const std::vector<sh::ShaderVariable> &shVaryings,
                              VaryingPacking *varyingPacking)
      {
          std::vector<PackedVarying> packedVaryings;
          for (const auto &shVarying : shVaryings)
          {
              packedVaryings.push_back(PackedVarying(shVarying, shVarying.interpolation));
          }
  
          InfoLog infoLog;
          std::vector<std::string> transformFeedbackVaryings;
  
          return varyingPacking->packUserVaryings(infoLog, packedVaryings);
      }
  
      // Uses the "relaxed" ANGLE packing mode.
      bool packVaryings(GLuint maxVaryings, const std::vector<sh::ShaderVariable> &shVaryings)
      {
          VaryingPacking varyingPacking(maxVaryings, PackMode::ANGLE_RELAXED);
          return testVaryingPacking(shVaryings, &varyingPacking);
      }
  
      // Uses the stricter WebGL style packing rules.
      bool packVaryingsStrict(GLuint maxVaryings, const std::vector<sh::ShaderVariable> &shVaryings)
      {
          VaryingPacking varyingPacking(maxVaryings, PackMode::WEBGL_STRICT);
          return testVaryingPacking(shVaryings, &varyingPacking);
      }
  
      const int kMaxVaryings = GetParam();
  };
  
  std::vector<sh::ShaderVariable> MakeVaryings(GLenum type, size_t count, size_t arraySize)
  {
      std::vector<sh::ShaderVariable> varyings;
  
      for (size_t index = 0; index < count; ++index)
      {
          std::stringstream strstr;
          strstr << type << index;
  
          sh::ShaderVariable varying;
          varying.type       = type;
          varying.precision  = GL_MEDIUM_FLOAT;
          varying.name       = strstr.str();
          varying.mappedName = strstr.str();
          if (arraySize > 0)
          {
              varying.arraySizes.push_back(static_cast<unsigned int>(arraySize));
          }
          varying.staticUse     = true;
          varying.interpolation = sh::INTERPOLATION_FLAT;
          varying.isInvariant   = false;
  
          varyings.push_back(varying);
      }
  
      return varyings;
  }
  
  void AddVaryings(std::vector<sh::ShaderVariable> *varyings,
                   GLenum type,
                   size_t count,
                   size_t arraySize)
  {
      const auto &newVaryings = MakeVaryings(type, count, arraySize);
      varyings->insert(varyings->end(), newVaryings.begin(), newVaryings.end());
  }
  
  // Test that a single varying can't overflow the packing.
  TEST_P(VaryingPackingTest, OneVaryingLargerThanMax)
  {
      ASSERT_FALSE(packVaryings(1, MakeVaryings(GL_FLOAT_MAT4, 1, 0)));
  }
  
  // This will overflow the available varying space.
  TEST_P(VaryingPackingTest, MaxPlusOneVaryingVec3)
  {
      ASSERT_FALSE(packVaryings(kMaxVaryings, MakeVaryings(GL_FLOAT_VEC3, kMaxVaryings + 1, 0)));
  }
  
  // This will overflow the available varying space.
  TEST_P(VaryingPackingTest, MaxPlusOneVaryingVec3Array)
  {
      ASSERT_FALSE(packVaryings(kMaxVaryings, MakeVaryings(GL_FLOAT_VEC3, kMaxVaryings / 2 + 1, 2)));
  }
  
  // This will overflow the available varying space.
  TEST_P(VaryingPackingTest, MaxVaryingVec3AndOneVec2)
  {
      std::vector<sh::ShaderVariable> varyings = MakeVaryings(GL_FLOAT_VEC3, kMaxVaryings, 0);
      AddVaryings(&varyings, GL_FLOAT_VEC2, 1, 0);
      ASSERT_FALSE(packVaryings(kMaxVaryings, varyings));
  }
  
  // This should work since two vec2s are packed in a single register.
  TEST_P(VaryingPackingTest, MaxPlusOneVaryingVec2)
  {
      ASSERT_TRUE(packVaryings(kMaxVaryings, MakeVaryings(GL_FLOAT_VEC2, kMaxVaryings + 1, 0)));
  }
  
  // Same for this one as above.
  TEST_P(VaryingPackingTest, TwiceMaxVaryingVec2)
  {
      ASSERT_TRUE(packVaryings(kMaxVaryings, MakeVaryings(GL_FLOAT_VEC2, kMaxVaryings * 2, 0)));
  }
  
  // This should not work since it overflows available varying space.
  TEST_P(VaryingPackingTest, TooManyVaryingVec2)
  {
      ASSERT_FALSE(packVaryings(kMaxVaryings, MakeVaryings(GL_FLOAT_VEC2, kMaxVaryings * 2 + 1, 0)));
  }
  
  // This should work according to the example GL packing rules - the float varyings are slotted
  // into the end of the vec3 varying arrays.
  TEST_P(VaryingPackingTest, MaxVaryingVec3ArrayAndFloatArrays)
  {
      std::vector<sh::ShaderVariable> varyings = MakeVaryings(GL_FLOAT_VEC3, kMaxVaryings / 2, 2);
      AddVaryings(&varyings, GL_FLOAT, kMaxVaryings / 2, 2);
      ASSERT_TRUE(packVaryings(kMaxVaryings, varyings));
  }
  
  // This should not work - it has one too many float arrays.
  TEST_P(VaryingPackingTest, MaxVaryingVec3ArrayAndMaxPlusOneFloatArray)
  {
      std::vector<sh::ShaderVariable> varyings = MakeVaryings(GL_FLOAT_VEC3, kMaxVaryings / 2, 2);
      AddVaryings(&varyings, GL_FLOAT, kMaxVaryings / 2 + 1, 2);
      ASSERT_FALSE(packVaryings(kMaxVaryings, varyings));
  }
  
  // WebGL should fail to pack max+1 vec2 arrays, unlike our more relaxed packing.
  TEST_P(VaryingPackingTest, MaxPlusOneMat2VaryingsFailsWebGL)
  {
      auto varyings = MakeVaryings(GL_FLOAT_MAT2, kMaxVaryings / 2 + 1, 0);
      ASSERT_FALSE(packVaryingsStrict(kMaxVaryings, varyings));
  }
  
  // Makes separate tests for different values of kMaxVaryings.
  INSTANTIATE_TEST_SUITE_P(, VaryingPackingTest, ::testing::Values(1, 4, 8));
  
  }  // anonymous namespace
  

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