embedder_test_surface_gl_impeller.cc

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#include "flatbuffers/stl_emulation.h"
#include "flutter/impeller/renderer/backend/gles/test/mock_gles.h"
#include "flutter/shell/platform/embedder/embedder_surface_gl_impeller.h"
#include "impeller/renderer/backend/gles/shader_function_gles.h"
 
#include "gmock/gmock.h"
#include "gtest/gtest.h"
 
namespace flutter {
namespace testing {
 
using ::testing::Not;
using ::testing::StartsWith;
 
namespace {
EmbedderSurfaceGLSkia::GLDispatchTable StubDispatchTable(
    std::string_view version) {
  impeller::testing::MockGLES::Init(flatbuffers::nullopt, version.data());
  static constexpr auto dummy_always_true = [] { return true; };
  return EmbedderSurfaceGLSkia::GLDispatchTable{
      .gl_make_current_callback = dummy_always_true,
      .gl_clear_current_callback = dummy_always_true,
      .gl_present_callback = [](const auto) { return true; },
      .gl_fbo_callback = [](const auto) { return 0; },
      .gl_make_resource_current_callback = dummy_always_true,
      .gl_surface_transformation_callback = [] { return DlMatrix{}; },
      .gl_proc_resolver = impeller::testing::kMockResolverGLES,
      .gl_populate_existing_damage = [](const auto) { return GLFBOInfo{}; },
  };
}
}  // namespace
 
TEST(EmbedderSurfaceGLImpellerTest, GLES3ContextHasGLES3Shaders) {
  const auto gl_dispatch_table =
      StubDispatchTable(/* version */ "OpenGL ES 3.0");
  const auto surface = EmbedderSurfaceGLImpeller(
      gl_dispatch_table, /* fbo_reset_after_present */ false,
      /* external_view_embedder */ nullptr);
 
  const std::shared_ptr<impeller::Context> context =
      surface.CreateImpellerContext();
  const std::shared_ptr<impeller::ShaderLibrary> shaders =
      context->GetShaderLibrary();
  const std::shared_ptr<const impeller::ShaderFunction> func =
      shaders->GetFunction("imp_line_fragment_main",
                           impeller::ShaderStage::kFragment);
  const auto gles_func = impeller::ShaderFunctionGLES::Cast(func.get());
  const std::shared_ptr<const fml::Mapping> source =
      gles_func->GetSourceMapping();
  const auto text =
      std::string_view(reinterpret_cast<const char*>(source->GetMapping()));
  EXPECT_THAT(text, StartsWith("#version 300 es"));
}
 
TEST(EmbedderSurfaceGLImpellerTest, GLES2ContextDoesNotHaveGLES3Shaders) {
  const auto gl_dispatch_table =
      StubDispatchTable(/* version */ "OpenGL ES 2.0");
  const auto surface = EmbedderSurfaceGLImpeller(
      gl_dispatch_table, /* fbo_reset_after_present */ false,
      /* external_view_embedder */ nullptr);
 
  const std::shared_ptr<impeller::Context> context =
      surface.CreateImpellerContext();
  const std::shared_ptr<impeller::ShaderLibrary> shaders =
      context->GetShaderLibrary();
  const std::shared_ptr<const impeller::ShaderFunction> func =
      shaders->GetFunction("imp_line_fragment_main",
                           impeller::ShaderStage::kFragment);
  const auto gles_func = impeller::ShaderFunctionGLES::Cast(func.get());
  const std::shared_ptr<const fml::Mapping> source =
      gles_func->GetSourceMapping();
  const auto text =
      std::string_view(reinterpret_cast<const char*>(source->GetMapping()));
  EXPECT_THAT(text, StartsWith("#version 100"));
}
}  // namespace testing
}  // namespace flutter