// Copyright 2012 The Chromium 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 "cc/output/gl_renderer.h"

#include <set>

#include "cc/base/math_util.h"
#include "cc/output/compositor_frame_metadata.h"
#include "cc/resources/resource_provider.h"
#include "cc/test/fake_impl_proxy.h"
#include "cc/test/fake_layer_tree_host_impl.h"
#include "cc/test/fake_output_surface.h"
#include "cc/test/fake_output_surface_client.h"
#include "cc/test/fake_renderer_client.h"
#include "cc/test/pixel_test.h"
#include "cc/test/render_pass_test_common.h"
#include "cc/test/render_pass_test_utils.h"
#include "cc/test/test_shared_bitmap_manager.h"
#include "cc/test/test_web_graphics_context_3d.h"
#include "gpu/GLES2/gl2extchromium.h"
#include "gpu/command_buffer/client/context_support.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/core/SkImageFilter.h"
#include "third_party/skia/include/core/SkMatrix.h"
#include "third_party/skia/include/effects/SkColorFilterImageFilter.h"
#include "third_party/skia/include/effects/SkColorMatrixFilter.h"
#include "ui/gfx/transform.h"

using testing::_;
using testing::AnyNumber;
using testing::Args;
using testing::AtLeast;
using testing::ElementsAre;
using testing::Expectation;
using testing::InSequence;
using testing::Mock;
using testing::Return;
using testing::StrictMock;

namespace cc {

class GLRendererTest : public testing::Test {
 protected:
  RenderPass* root_render_pass() { return render_passes_in_draw_order_.back(); }

  RenderPassList render_passes_in_draw_order_;
};

#define EXPECT_PROGRAM_VALID(program_binding)      \
  do {                                             \
    EXPECT_TRUE((program_binding)->program());     \
    EXPECT_TRUE((program_binding)->initialized()); \
  } while (false)

static inline SkXfermode::Mode BlendModeToSkXfermode(BlendMode blend_mode) {
  switch (blend_mode) {
    case BlendModeNone:
    case BlendModeNormal:
      return SkXfermode::kSrcOver_Mode;
    case BlendModeScreen:
      return SkXfermode::kScreen_Mode;
    case BlendModeOverlay:
      return SkXfermode::kOverlay_Mode;
    case BlendModeDarken:
      return SkXfermode::kDarken_Mode;
    case BlendModeLighten:
      return SkXfermode::kLighten_Mode;
    case BlendModeColorDodge:
      return SkXfermode::kColorDodge_Mode;
    case BlendModeColorBurn:
      return SkXfermode::kColorBurn_Mode;
    case BlendModeHardLight:
      return SkXfermode::kHardLight_Mode;
    case BlendModeSoftLight:
      return SkXfermode::kSoftLight_Mode;
    case BlendModeDifference:
      return SkXfermode::kDifference_Mode;
    case BlendModeExclusion:
      return SkXfermode::kExclusion_Mode;
    case BlendModeMultiply:
      return SkXfermode::kMultiply_Mode;
    case BlendModeHue:
      return SkXfermode::kHue_Mode;
    case BlendModeSaturation:
      return SkXfermode::kSaturation_Mode;
    case BlendModeColor:
      return SkXfermode::kColor_Mode;
    case BlendModeLuminosity:
      return SkXfermode::kLuminosity_Mode;
    case NumBlendModes:
      NOTREACHED();
  }
  return SkXfermode::kSrcOver_Mode;
}

// Explicitly named to be a friend in GLRenderer for shader access.
class GLRendererShaderPixelTest : public GLRendererPixelTest {
 public:
  void TestShaders() {
    ASSERT_FALSE(renderer()->IsContextLost());
    EXPECT_PROGRAM_VALID(renderer()->GetTileCheckerboardProgram());
    EXPECT_PROGRAM_VALID(renderer()->GetDebugBorderProgram());
    EXPECT_PROGRAM_VALID(renderer()->GetSolidColorProgram());
    EXPECT_PROGRAM_VALID(renderer()->GetSolidColorProgramAA());
    TestShadersWithTexCoordPrecision(TexCoordPrecisionMedium);
    TestShadersWithTexCoordPrecision(TexCoordPrecisionHigh);
    ASSERT_FALSE(renderer()->IsContextLost());
  }

  void TestShadersWithTexCoordPrecision(TexCoordPrecision precision) {
    for (int i = 0; i < NumBlendModes; ++i) {
      BlendMode blend_mode = static_cast<BlendMode>(i);
      EXPECT_PROGRAM_VALID(
          renderer()->GetRenderPassProgram(precision, blend_mode));
      EXPECT_PROGRAM_VALID(
          renderer()->GetRenderPassProgramAA(precision, blend_mode));
    }
    EXPECT_PROGRAM_VALID(renderer()->GetTextureProgram(precision));
    EXPECT_PROGRAM_VALID(
        renderer()->GetNonPremultipliedTextureProgram(precision));
    EXPECT_PROGRAM_VALID(renderer()->GetTextureBackgroundProgram(precision));
    EXPECT_PROGRAM_VALID(
        renderer()->GetNonPremultipliedTextureBackgroundProgram(precision));
    EXPECT_PROGRAM_VALID(renderer()->GetTextureIOSurfaceProgram(precision));
    EXPECT_PROGRAM_VALID(renderer()->GetVideoYUVProgram(precision));
    EXPECT_PROGRAM_VALID(renderer()->GetVideoYUVAProgram(precision));
    // This is unlikely to be ever true in tests due to usage of osmesa.
    if (renderer()->Capabilities().using_egl_image)
      EXPECT_PROGRAM_VALID(renderer()->GetVideoStreamTextureProgram(precision));
    else
      EXPECT_FALSE(renderer()->GetVideoStreamTextureProgram(precision));
    TestShadersWithSamplerType(precision, SamplerType2D);
    TestShadersWithSamplerType(precision, SamplerType2DRect);
    // This is unlikely to be ever true in tests due to usage of osmesa.
    if (renderer()->Capabilities().using_egl_image)
      TestShadersWithSamplerType(precision, SamplerTypeExternalOES);
  }

  void TestShadersWithSamplerType(TexCoordPrecision precision,
                                  SamplerType sampler) {
    EXPECT_PROGRAM_VALID(renderer()->GetTileProgram(precision, sampler));
    EXPECT_PROGRAM_VALID(renderer()->GetTileProgramOpaque(precision, sampler));
    EXPECT_PROGRAM_VALID(renderer()->GetTileProgramAA(precision, sampler));
    EXPECT_PROGRAM_VALID(renderer()->GetTileProgramSwizzle(precision, sampler));
    EXPECT_PROGRAM_VALID(
        renderer()->GetTileProgramSwizzleOpaque(precision, sampler));
    EXPECT_PROGRAM_VALID(
        renderer()->GetTileProgramSwizzleAA(precision, sampler));
    for (int i = 0; i < NumBlendModes; ++i) {
      BlendMode blend_mode = static_cast<BlendMode>(i);
      EXPECT_PROGRAM_VALID(
          renderer()->GetRenderPassMaskProgram(precision, sampler, blend_mode));
      EXPECT_PROGRAM_VALID(renderer()->GetRenderPassMaskProgramAA(
          precision, sampler, blend_mode));
      EXPECT_PROGRAM_VALID(renderer()->GetRenderPassMaskColorMatrixProgramAA(
          precision, sampler, blend_mode));
      EXPECT_PROGRAM_VALID(renderer()->GetRenderPassMaskColorMatrixProgram(
          precision, sampler, blend_mode));
    }
  }
};

namespace {

#if !defined(OS_ANDROID)
TEST_F(GLRendererShaderPixelTest, AllShadersCompile) { TestShaders(); }
#endif

class FakeRendererGL : public GLRenderer {
 public:
  FakeRendererGL(RendererClient* client,
                 const LayerTreeSettings* settings,
                 OutputSurface* output_surface,
                 ResourceProvider* resource_provider)
      : GLRenderer(client,
                   settings,
                   output_surface,
                   resource_provider,
                   NULL,
                   0) {}

  // GLRenderer methods.

  // Changing visibility to public.
  using GLRenderer::IsBackbufferDiscarded;
  using GLRenderer::DoDrawQuad;
  using GLRenderer::BeginDrawingFrame;
  using GLRenderer::FinishDrawingQuadList;
  using GLRenderer::stencil_enabled;
};

class GLRendererWithDefaultHarnessTest : public GLRendererTest {
 protected:
  GLRendererWithDefaultHarnessTest() {
    output_surface_ =
        FakeOutputSurface::Create3d(TestWebGraphicsContext3D::Create()).Pass();
    CHECK(output_surface_->BindToClient(&output_surface_client_));

    shared_bitmap_manager_.reset(new TestSharedBitmapManager());
    resource_provider_ = ResourceProvider::Create(output_surface_.get(),
                                                  shared_bitmap_manager_.get(),
                                                  NULL,
                                                  NULL,
                                                  0,
                                                  false,
                                                  1).Pass();
    renderer_ = make_scoped_ptr(new FakeRendererGL(&renderer_client_,
                                                   &settings_,
                                                   output_surface_.get(),
                                                   resource_provider_.get()));
  }

  void SwapBuffers() { renderer_->SwapBuffers(CompositorFrameMetadata()); }

  LayerTreeSettings settings_;
  FakeOutputSurfaceClient output_surface_client_;
  scoped_ptr<FakeOutputSurface> output_surface_;
  FakeRendererClient renderer_client_;
  scoped_ptr<SharedBitmapManager> shared_bitmap_manager_;
  scoped_ptr<ResourceProvider> resource_provider_;
  scoped_ptr<FakeRendererGL> renderer_;
};

// Closing the namespace here so that GLRendererShaderTest can take advantage
// of the friend relationship with GLRenderer and all of the mock classes
// declared above it.
}  // namespace

class GLRendererShaderTest : public GLRendererTest {
 protected:
  GLRendererShaderTest() {
    output_surface_ = FakeOutputSurface::Create3d().Pass();
    CHECK(output_surface_->BindToClient(&output_surface_client_));

    shared_bitmap_manager_.reset(new TestSharedBitmapManager());
    resource_provider_ = ResourceProvider::Create(output_surface_.get(),
                                                  shared_bitmap_manager_.get(),
                                                  NULL,
                                                  NULL,
                                                  0,
                                                  false,
                                                  1).Pass();
    renderer_.reset(new FakeRendererGL(&renderer_client_,
                                       &settings_,
                                       output_surface_.get(),
                                       resource_provider_.get()));
  }

  void TestRenderPassProgram(TexCoordPrecision precision,
                             BlendMode blend_mode) {
    EXPECT_PROGRAM_VALID(
        &renderer_->render_pass_program_[precision][blend_mode]);
    EXPECT_EQ(renderer_->render_pass_program_[precision][blend_mode].program(),
              renderer_->program_shadow_);
  }

  void TestRenderPassColorMatrixProgram(TexCoordPrecision precision,
                                        BlendMode blend_mode) {
    EXPECT_PROGRAM_VALID(
        &renderer_->render_pass_color_matrix_program_[precision][blend_mode]);
    EXPECT_EQ(
        renderer_->render_pass_color_matrix_program_[precision][blend_mode]
            .program(),
        renderer_->program_shadow_);
  }

  void TestRenderPassMaskProgram(TexCoordPrecision precision,
                                 SamplerType sampler,
                                 BlendMode blend_mode) {
    EXPECT_PROGRAM_VALID(
        &renderer_->render_pass_mask_program_[precision][sampler][blend_mode]);
    EXPECT_EQ(
        renderer_->render_pass_mask_program_[precision][sampler][blend_mode]
            .program(),
        renderer_->program_shadow_);
  }

  void TestRenderPassMaskColorMatrixProgram(TexCoordPrecision precision,
                                            SamplerType sampler,
                                            BlendMode blend_mode) {
    EXPECT_PROGRAM_VALID(&renderer_->render_pass_mask_color_matrix_program_
                              [precision][sampler][blend_mode]);
    EXPECT_EQ(renderer_->render_pass_mask_color_matrix_program_
                  [precision][sampler][blend_mode].program(),
              renderer_->program_shadow_);
  }

  void TestRenderPassProgramAA(TexCoordPrecision precision,
                               BlendMode blend_mode) {
    EXPECT_PROGRAM_VALID(
        &renderer_->render_pass_program_aa_[precision][blend_mode]);
    EXPECT_EQ(
        renderer_->render_pass_program_aa_[precision][blend_mode].program(),
        renderer_->program_shadow_);
  }

  void TestRenderPassColorMatrixProgramAA(TexCoordPrecision precision,
                                          BlendMode blend_mode) {
    EXPECT_PROGRAM_VALID(
        &renderer_
             ->render_pass_color_matrix_program_aa_[precision][blend_mode]);
    EXPECT_EQ(
        renderer_->render_pass_color_matrix_program_aa_[precision][blend_mode]
            .program(),
        renderer_->program_shadow_);
  }

  void TestRenderPassMaskProgramAA(TexCoordPrecision precision,
                                   SamplerType sampler,
                                   BlendMode blend_mode) {
    EXPECT_PROGRAM_VALID(
        &renderer_
             ->render_pass_mask_program_aa_[precision][sampler][blend_mode]);
    EXPECT_EQ(
        renderer_->render_pass_mask_program_aa_[precision][sampler][blend_mode]
            .program(),
        renderer_->program_shadow_);
  }

  void TestRenderPassMaskColorMatrixProgramAA(TexCoordPrecision precision,
                                              SamplerType sampler,
                                              BlendMode blend_mode) {
    EXPECT_PROGRAM_VALID(&renderer_->render_pass_mask_color_matrix_program_aa_
                              [precision][sampler][blend_mode]);
    EXPECT_EQ(renderer_->render_pass_mask_color_matrix_program_aa_
                  [precision][sampler][blend_mode].program(),
              renderer_->program_shadow_);
  }

  void TestSolidColorProgramAA() {
    EXPECT_PROGRAM_VALID(&renderer_->solid_color_program_aa_);
    EXPECT_EQ(renderer_->solid_color_program_aa_.program(),
              renderer_->program_shadow_);
  }

  LayerTreeSettings settings_;
  FakeOutputSurfaceClient output_surface_client_;
  scoped_ptr<FakeOutputSurface> output_surface_;
  FakeRendererClient renderer_client_;
  scoped_ptr<SharedBitmapManager> shared_bitmap_manager_;
  scoped_ptr<ResourceProvider> resource_provider_;
  scoped_ptr<FakeRendererGL> renderer_;
};

namespace {

// Test GLRenderer DiscardBackbuffer functionality:
// Suggest discarding framebuffer when one exists and the renderer is not
// visible.
// Expected: it is discarded and damage tracker is reset.
TEST_F(
    GLRendererWithDefaultHarnessTest,
    SuggestBackbufferNoShouldDiscardBackbufferAndDamageRootLayerIfNotVisible) {
  renderer_->SetVisible(false);
  EXPECT_EQ(1, renderer_client_.set_full_root_layer_damage_count());
  EXPECT_TRUE(renderer_->IsBackbufferDiscarded());
}

// Test GLRenderer DiscardBackbuffer functionality:
// Suggest discarding framebuffer when one exists and the renderer is visible.
// Expected: the allocation is ignored.
TEST_F(GLRendererWithDefaultHarnessTest,
       SuggestBackbufferNoDoNothingWhenVisible) {
  renderer_->SetVisible(true);
  EXPECT_EQ(0, renderer_client_.set_full_root_layer_damage_count());
  EXPECT_FALSE(renderer_->IsBackbufferDiscarded());
}

// Test GLRenderer DiscardBackbuffer functionality:
// Suggest discarding framebuffer when one does not exist.
// Expected: it does nothing.
TEST_F(GLRendererWithDefaultHarnessTest,
       SuggestBackbufferNoWhenItDoesntExistShouldDoNothing) {
  renderer_->SetVisible(false);
  EXPECT_EQ(1, renderer_client_.set_full_root_layer_damage_count());
  EXPECT_TRUE(renderer_->IsBackbufferDiscarded());

  EXPECT_EQ(1, renderer_client_.set_full_root_layer_damage_count());
  EXPECT_TRUE(renderer_->IsBackbufferDiscarded());
}

// Test GLRenderer DiscardBackbuffer functionality:
// Begin drawing a frame while a framebuffer is discarded.
// Expected: will recreate framebuffer.
TEST_F(GLRendererWithDefaultHarnessTest,
       DiscardedBackbufferIsRecreatedForScopeDuration) {
  gfx::Rect viewport_rect(1, 1);
  renderer_->SetVisible(false);
  EXPECT_TRUE(renderer_->IsBackbufferDiscarded());
  EXPECT_EQ(1, renderer_client_.set_full_root_layer_damage_count());

  AddRenderPass(&render_passes_in_draw_order_,
                RenderPassId(1, 0),
                viewport_rect,
                gfx::Transform());

  renderer_->SetVisible(true);
  renderer_->DrawFrame(&render_passes_in_draw_order_,
                       1.f,
                       viewport_rect,
                       viewport_rect,
                       false);
  EXPECT_FALSE(renderer_->IsBackbufferDiscarded());

  SwapBuffers();
  EXPECT_EQ(1u, output_surface_->num_sent_frames());
}

TEST_F(GLRendererWithDefaultHarnessTest, ExternalStencil) {
  gfx::Rect viewport_rect(1, 1);
  EXPECT_FALSE(renderer_->stencil_enabled());

  output_surface_->set_has_external_stencil_test(true);

  TestRenderPass* root_pass = AddRenderPass(&render_passes_in_draw_order_,
                                            RenderPassId(1, 0),
                                            viewport_rect,
                                            gfx::Transform());
  root_pass->has_transparent_background = false;

  renderer_->DrawFrame(&render_passes_in_draw_order_,
                       1.f,
                       viewport_rect,
                       viewport_rect,
                       false);
  EXPECT_TRUE(renderer_->stencil_enabled());
}

class ForbidSynchronousCallContext : public TestWebGraphicsContext3D {
 public:
  ForbidSynchronousCallContext() {}

  void getAttachedShaders(GLuint program,
                          GLsizei max_count,
                          GLsizei* count,
                          GLuint* shaders) override {
    ADD_FAILURE();
  }
  GLint getAttribLocation(GLuint program, const GLchar* name) override {
    ADD_FAILURE();
    return 0;
  }
  void getBooleanv(GLenum pname, GLboolean* value) override { ADD_FAILURE(); }
  void getBufferParameteriv(GLenum target,
                            GLenum pname,
                            GLint* value) override {
    ADD_FAILURE();
  }
  GLenum getError() override {
    ADD_FAILURE();
    return GL_NO_ERROR;
  }
  void getFloatv(GLenum pname, GLfloat* value) override { ADD_FAILURE(); }
  void getFramebufferAttachmentParameteriv(GLenum target,
                                           GLenum attachment,
                                           GLenum pname,
                                           GLint* value) override {
    ADD_FAILURE();
  }
  void getIntegerv(GLenum pname, GLint* value) override {
    if (pname == GL_MAX_TEXTURE_SIZE) {
      // MAX_TEXTURE_SIZE is cached client side, so it's OK to query.
      *value = 1024;
    } else {
      ADD_FAILURE();
    }
  }

  // We allow querying the shader compilation and program link status in debug
  // mode, but not release.
  void getProgramiv(GLuint program, GLenum pname, GLint* value) override {
#ifndef NDEBUG
    *value = 1;
#else
    ADD_FAILURE();
#endif
  }

  void getShaderiv(GLuint shader, GLenum pname, GLint* value) override {
#ifndef NDEBUG
    *value = 1;
#else
    ADD_FAILURE();
#endif
  }

  void getRenderbufferParameteriv(GLenum target,
                                  GLenum pname,
                                  GLint* value) override {
    ADD_FAILURE();
  }

  void getShaderPrecisionFormat(GLenum shadertype,
                                GLenum precisiontype,
                                GLint* range,
                                GLint* precision) override {
    ADD_FAILURE();
  }
  void getTexParameterfv(GLenum target, GLenum pname, GLfloat* value) override {
    ADD_FAILURE();
  }
  void getTexParameteriv(GLenum target, GLenum pname, GLint* value) override {
    ADD_FAILURE();
  }
  void getUniformfv(GLuint program, GLint location, GLfloat* value) override {
    ADD_FAILURE();
  }
  void getUniformiv(GLuint program, GLint location, GLint* value) override {
    ADD_FAILURE();
  }
  GLint getUniformLocation(GLuint program, const GLchar* name) override {
    ADD_FAILURE();
    return 0;
  }
  void getVertexAttribfv(GLuint index, GLenum pname, GLfloat* value) override {
    ADD_FAILURE();
  }
  void getVertexAttribiv(GLuint index, GLenum pname, GLint* value) override {
    ADD_FAILURE();
  }
  GLsizeiptr getVertexAttribOffset(GLuint index, GLenum pname) override {
    ADD_FAILURE();
    return 0;
  }
};
TEST_F(GLRendererTest, InitializationDoesNotMakeSynchronousCalls) {
  FakeOutputSurfaceClient output_surface_client;
  scoped_ptr<OutputSurface> output_surface(FakeOutputSurface::Create3d(
      scoped_ptr<TestWebGraphicsContext3D>(new ForbidSynchronousCallContext)));
  CHECK(output_surface->BindToClient(&output_surface_client));

  scoped_ptr<SharedBitmapManager> shared_bitmap_manager(
      new TestSharedBitmapManager());
  scoped_ptr<ResourceProvider> resource_provider(
      ResourceProvider::Create(output_surface.get(),
                               shared_bitmap_manager.get(),
                               NULL,
                               NULL,
                               0,
                               false,
                               1));

  LayerTreeSettings settings;
  FakeRendererClient renderer_client;
  FakeRendererGL renderer(&renderer_client,
                          &settings,
                          output_surface.get(),
                          resource_provider.get());
}

class LoseContextOnFirstGetContext : public TestWebGraphicsContext3D {
 public:
  LoseContextOnFirstGetContext() {}

  void getProgramiv(GLuint program, GLenum pname, GLint* value) override {
    context_lost_ = true;
    *value = 0;
  }

  void getShaderiv(GLuint shader, GLenum pname, GLint* value) override {
    context_lost_ = true;
    *value = 0;
  }
};

TEST_F(GLRendererTest, InitializationWithQuicklyLostContextDoesNotAssert) {
  FakeOutputSurfaceClient output_surface_client;
  scoped_ptr<OutputSurface> output_surface(FakeOutputSurface::Create3d(
      scoped_ptr<TestWebGraphicsContext3D>(new LoseContextOnFirstGetContext)));
  CHECK(output_surface->BindToClient(&output_surface_client));

  scoped_ptr<SharedBitmapManager> shared_bitmap_manager(
      new TestSharedBitmapManager());
  scoped_ptr<ResourceProvider> resource_provider(
      ResourceProvider::Create(output_surface.get(),
                               shared_bitmap_manager.get(),
                               NULL,
                               NULL,
                               0,
                               false,
                               1));

  LayerTreeSettings settings;
  FakeRendererClient renderer_client;
  FakeRendererGL renderer(&renderer_client,
                          &settings,
                          output_surface.get(),
                          resource_provider.get());
}

class ClearCountingContext : public TestWebGraphicsContext3D {
 public:
  ClearCountingContext() { test_capabilities_.gpu.discard_framebuffer = true; }

  MOCK_METHOD3(discardFramebufferEXT,
               void(GLenum target,
                    GLsizei numAttachments,
                    const GLenum* attachments));
  MOCK_METHOD1(clear, void(GLbitfield mask));
};

TEST_F(GLRendererTest, OpaqueBackground) {
  scoped_ptr<ClearCountingContext> context_owned(new ClearCountingContext);
  ClearCountingContext* context = context_owned.get();

  FakeOutputSurfaceClient output_surface_client;
  scoped_ptr<OutputSurface> output_surface(
      FakeOutputSurface::Create3d(context_owned.Pass()));
  CHECK(output_surface->BindToClient(&output_surface_client));

  scoped_ptr<SharedBitmapManager> shared_bitmap_manager(
      new TestSharedBitmapManager());
  scoped_ptr<ResourceProvider> resource_provider(
      ResourceProvider::Create(output_surface.get(),
                               shared_bitmap_manager.get(),
                               NULL,
                               NULL,
                               0,
                               false,
                               1));

  LayerTreeSettings settings;
  FakeRendererClient renderer_client;
  FakeRendererGL renderer(&renderer_client,
                          &settings,
                          output_surface.get(),
                          resource_provider.get());

  gfx::Rect viewport_rect(1, 1);
  TestRenderPass* root_pass = AddRenderPass(&render_passes_in_draw_order_,
                                            RenderPassId(1, 0),
                                            viewport_rect,
                                            gfx::Transform());
  root_pass->has_transparent_background = false;

  // On DEBUG builds, render passes with opaque background clear to blue to
  // easily see regions that were not drawn on the screen.
  EXPECT_CALL(*context, discardFramebufferEXT(GL_FRAMEBUFFER, _, _))
      .With(Args<2, 1>(ElementsAre(GL_COLOR_EXT)))
      .Times(1);
#ifdef NDEBUG
  EXPECT_CALL(*context, clear(_)).Times(0);
#else
  EXPECT_CALL(*context, clear(_)).Times(1);
#endif
  renderer.DrawFrame(&render_passes_in_draw_order_,
                     1.f,
                     viewport_rect,
                     viewport_rect,
                     false);
  Mock::VerifyAndClearExpectations(context);
}

TEST_F(GLRendererTest, TransparentBackground) {
  scoped_ptr<ClearCountingContext> context_owned(new ClearCountingContext);
  ClearCountingContext* context = context_owned.get();

  FakeOutputSurfaceClient output_surface_client;
  scoped_ptr<OutputSurface> output_surface(
      FakeOutputSurface::Create3d(context_owned.Pass()));
  CHECK(output_surface->BindToClient(&output_surface_client));

  scoped_ptr<SharedBitmapManager> shared_bitmap_manager(
      new TestSharedBitmapManager());
  scoped_ptr<ResourceProvider> resource_provider(
      ResourceProvider::Create(output_surface.get(),
                               shared_bitmap_manager.get(),
                               NULL,
                               NULL,
                               0,
                               false,
                               1));

  LayerTreeSettings settings;
  FakeRendererClient renderer_client;
  FakeRendererGL renderer(&renderer_client,
                          &settings,
                          output_surface.get(),
                          resource_provider.get());

  gfx::Rect viewport_rect(1, 1);
  TestRenderPass* root_pass = AddRenderPass(&render_passes_in_draw_order_,
                                            RenderPassId(1, 0),
                                            viewport_rect,
                                            gfx::Transform());
  root_pass->has_transparent_background = true;

  EXPECT_CALL(*context, discardFramebufferEXT(GL_FRAMEBUFFER, 1, _)).Times(1);
  EXPECT_CALL(*context, clear(_)).Times(1);
  renderer.DrawFrame(&render_passes_in_draw_order_,
                     1.f,
                     viewport_rect,
                     viewport_rect,
                     false);

  Mock::VerifyAndClearExpectations(context);
}

TEST_F(GLRendererTest, OffscreenOutputSurface) {
  scoped_ptr<ClearCountingContext> context_owned(new ClearCountingContext);
  ClearCountingContext* context = context_owned.get();

  FakeOutputSurfaceClient output_surface_client;
  scoped_ptr<OutputSurface> output_surface(
      FakeOutputSurface::CreateOffscreen(context_owned.Pass()));
  CHECK(output_surface->BindToClient(&output_surface_client));

  scoped_ptr<SharedBitmapManager> shared_bitmap_manager(
      new TestSharedBitmapManager());
  scoped_ptr<ResourceProvider> resource_provider(
      ResourceProvider::Create(output_surface.get(),
                               shared_bitmap_manager.get(),
                               NULL,
                               NULL,
                               0,
                               false,
                               1));

  LayerTreeSettings settings;
  FakeRendererClient renderer_client;
  FakeRendererGL renderer(&renderer_client,
                          &settings,
                          output_surface.get(),
                          resource_provider.get());

  gfx::Rect viewport_rect(1, 1);
  AddRenderPass(&render_passes_in_draw_order_,
                RenderPassId(1, 0),
                viewport_rect,
                gfx::Transform());

  EXPECT_CALL(*context, discardFramebufferEXT(GL_FRAMEBUFFER, _, _))
      .With(Args<2, 1>(ElementsAre(GL_COLOR_ATTACHMENT0)))
      .Times(1);
  EXPECT_CALL(*context, clear(_)).Times(AnyNumber());
  renderer.DrawFrame(&render_passes_in_draw_order_,
                     1.f,
                     viewport_rect,
                     viewport_rect,
                     false);
  Mock::VerifyAndClearExpectations(context);
}

class VisibilityChangeIsLastCallTrackingContext
    : public TestWebGraphicsContext3D {
 public:
  VisibilityChangeIsLastCallTrackingContext()
      : last_call_was_set_visibility_(false) {}

  // TestWebGraphicsContext3D methods.
  void flush() override { last_call_was_set_visibility_ = false; }
  void deleteTexture(GLuint) override { last_call_was_set_visibility_ = false; }
  void deleteFramebuffer(GLuint) override {
    last_call_was_set_visibility_ = false;
  }
  void deleteQueryEXT(GLuint) override {
    last_call_was_set_visibility_ = false;
  }
  void deleteRenderbuffer(GLuint) override {
    last_call_was_set_visibility_ = false;
  }

  // Methods added for test.
  void set_last_call_was_visibility(bool visible) {
    DCHECK(last_call_was_set_visibility_ == false);
    last_call_was_set_visibility_ = true;
  }
  bool last_call_was_set_visibility() const {
    return last_call_was_set_visibility_;
  }

 private:
  bool last_call_was_set_visibility_;
};

TEST_F(GLRendererTest, VisibilityChangeIsLastCall) {
  scoped_ptr<VisibilityChangeIsLastCallTrackingContext> context_owned(
      new VisibilityChangeIsLastCallTrackingContext);
  VisibilityChangeIsLastCallTrackingContext* context = context_owned.get();

  scoped_refptr<TestContextProvider> provider =
      TestContextProvider::Create(context_owned.Pass());

  provider->support()->SetSurfaceVisibleCallback(base::Bind(
      &VisibilityChangeIsLastCallTrackingContext::set_last_call_was_visibility,
      base::Unretained(context)));

  FakeOutputSurfaceClient output_surface_client;
  scoped_ptr<OutputSurface> output_surface(
      FakeOutputSurface::Create3d(provider));
  CHECK(output_surface->BindToClient(&output_surface_client));

  scoped_ptr<SharedBitmapManager> shared_bitmap_manager(
      new TestSharedBitmapManager());
  scoped_ptr<ResourceProvider> resource_provider(
      ResourceProvider::Create(output_surface.get(),
                               shared_bitmap_manager.get(),
                               NULL,
                               NULL,
                               0,
                               false,
                               1));

  LayerTreeSettings settings;
  FakeRendererClient renderer_client;
  FakeRendererGL renderer(&renderer_client,
                          &settings,
                          output_surface.get(),
                          resource_provider.get());

  gfx::Rect viewport_rect(1, 1);
  AddRenderPass(&render_passes_in_draw_order_,
                RenderPassId(1, 0),
                viewport_rect,
                gfx::Transform());

  // Ensure that the call to SetSurfaceVisible is the last call issue to the
  // GPU process, after glFlush is called, and after the RendererClient's
  // SetManagedMemoryPolicy is called. Plumb this tracking between both the
  // RenderClient and the Context by giving them both a pointer to a variable on
  // the stack.
  renderer.SetVisible(true);
  renderer.DrawFrame(&render_passes_in_draw_order_,
                     1.f,
                     viewport_rect,
                     viewport_rect,
                     false);
  renderer.SetVisible(false);
  EXPECT_TRUE(context->last_call_was_set_visibility());
}

class TextureStateTrackingContext : public TestWebGraphicsContext3D {
 public:
  TextureStateTrackingContext() : active_texture_(GL_INVALID_ENUM) {
    test_capabilities_.gpu.egl_image_external = true;
  }

  MOCK_METHOD1(waitSyncPoint, void(unsigned sync_point));
  MOCK_METHOD3(texParameteri, void(GLenum target, GLenum pname, GLint param));
  MOCK_METHOD4(drawElements,
               void(GLenum mode, GLsizei count, GLenum type, GLintptr offset));

  virtual void activeTexture(GLenum texture) {
    EXPECT_NE(texture, active_texture_);
    active_texture_ = texture;
  }

  GLenum active_texture() const { return active_texture_; }

 private:
  GLenum active_texture_;
};

TEST_F(GLRendererTest, ActiveTextureState) {
  scoped_ptr<TextureStateTrackingContext> context_owned(
      new TextureStateTrackingContext);
  TextureStateTrackingContext* context = context_owned.get();

  FakeOutputSurfaceClient output_surface_client;
  scoped_ptr<OutputSurface> output_surface(
      FakeOutputSurface::Create3d(context_owned.Pass()));
  CHECK(output_surface->BindToClient(&output_surface_client));

  scoped_ptr<SharedBitmapManager> shared_bitmap_manager(
      new TestSharedBitmapManager());
  scoped_ptr<ResourceProvider> resource_provider(
      ResourceProvider::Create(output_surface.get(),
                               shared_bitmap_manager.get(),
                               NULL,
                               NULL,
                               0,
                               false,
                               1));

  LayerTreeSettings settings;
  FakeRendererClient renderer_client;
  FakeRendererGL renderer(&renderer_client,
                          &settings,
                          output_surface.get(),
                          resource_provider.get());

  // During initialization we are allowed to set any texture parameters.
  EXPECT_CALL(*context, texParameteri(_, _, _)).Times(AnyNumber());

  RenderPassId id(1, 1);
  TestRenderPass* root_pass = AddRenderPass(
      &render_passes_in_draw_order_, id, gfx::Rect(100, 100), gfx::Transform());
  root_pass->AppendOneOfEveryQuadType(resource_provider.get(),
                                      RenderPassId(2, 1));

  renderer.DecideRenderPassAllocationsForFrame(render_passes_in_draw_order_);

  // Set up expected texture filter state transitions that match the quads
  // created in AppendOneOfEveryQuadType().
  Mock::VerifyAndClearExpectations(context);
  {
    InSequence sequence;

    // The sync points for all quads are waited on first. This sync point is
    // for a texture quad drawn later in the frame.
    EXPECT_CALL(*context,
                waitSyncPoint(TestRenderPass::kSyncPointForMailboxTextureQuad))
        .Times(1);

    // yuv_quad is drawn with the default linear filter.
    EXPECT_CALL(*context, drawElements(_, _, _, _));

    // tile_quad is drawn with GL_NEAREST because it is not transformed or
    // scaled.
    EXPECT_CALL(
        *context,
        texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST));
    EXPECT_CALL(
        *context,
        texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST));
    EXPECT_CALL(*context, drawElements(_, _, _, _));

    // transformed_tile_quad uses GL_LINEAR.
    EXPECT_CALL(*context, drawElements(_, _, _, _));

    // scaled_tile_quad also uses GL_LINEAR.
    EXPECT_CALL(*context, drawElements(_, _, _, _));

    // The remaining quads also use GL_LINEAR because nearest neighbor
    // filtering is currently only used with tile quads.
    EXPECT_CALL(*context, drawElements(_, _, _, _)).Times(7);
  }

  gfx::Rect viewport_rect(100, 100);
  renderer.DrawFrame(&render_passes_in_draw_order_,
                     1.f,
                     viewport_rect,
                     viewport_rect,
                     false);
  Mock::VerifyAndClearExpectations(context);
}

class NoClearRootRenderPassMockContext : public TestWebGraphicsContext3D {
 public:
  MOCK_METHOD1(clear, void(GLbitfield mask));
  MOCK_METHOD4(drawElements,
               void(GLenum mode, GLsizei count, GLenum type, GLintptr offset));
};

TEST_F(GLRendererTest, ShouldClearRootRenderPass) {
  scoped_ptr<NoClearRootRenderPassMockContext> mock_context_owned(
      new NoClearRootRenderPassMockContext);
  NoClearRootRenderPassMockContext* mock_context = mock_context_owned.get();

  FakeOutputSurfaceClient output_surface_client;
  scoped_ptr<OutputSurface> output_surface(
      FakeOutputSurface::Create3d(mock_context_owned.Pass()));
  CHECK(output_surface->BindToClient(&output_surface_client));

  scoped_ptr<SharedBitmapManager> shared_bitmap_manager(
      new TestSharedBitmapManager());
  scoped_ptr<ResourceProvider> resource_provider(
      ResourceProvider::Create(output_surface.get(),
                               shared_bitmap_manager.get(),
                               NULL,
                               NULL,
                               0,
                               false,
                               1));

  LayerTreeSettings settings;
  settings.should_clear_root_render_pass = false;

  FakeRendererClient renderer_client;
  FakeRendererGL renderer(&renderer_client,
                          &settings,
                          output_surface.get(),
                          resource_provider.get());

  gfx::Rect viewport_rect(10, 10);

  RenderPassId root_pass_id(1, 0);
  TestRenderPass* root_pass = AddRenderPass(&render_passes_in_draw_order_,
                                            root_pass_id,
                                            viewport_rect,
                                            gfx::Transform());
  AddQuad(root_pass, viewport_rect, SK_ColorGREEN);

  RenderPassId child_pass_id(2, 0);
  TestRenderPass* child_pass = AddRenderPass(&render_passes_in_draw_order_,
                                             child_pass_id,
                                             viewport_rect,
                                             gfx::Transform());
  AddQuad(child_pass, viewport_rect, SK_ColorBLUE);

  AddRenderPassQuad(root_pass, child_pass);

#ifdef NDEBUG
  GLint clear_bits = GL_COLOR_BUFFER_BIT;
#else
  GLint clear_bits = GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT;
#endif

  // First render pass is not the root one, clearing should happen.
  EXPECT_CALL(*mock_context, clear(clear_bits)).Times(AtLeast(1));

  Expectation first_render_pass =
      EXPECT_CALL(*mock_context, drawElements(_, _, _, _)).Times(1);

  // The second render pass is the root one, clearing should be prevented.
  EXPECT_CALL(*mock_context, clear(clear_bits)).Times(0).After(
      first_render_pass);

  EXPECT_CALL(*mock_context, drawElements(_, _, _, _)).Times(AnyNumber()).After(
      first_render_pass);

  renderer.DecideRenderPassAllocationsForFrame(render_passes_in_draw_order_);
  renderer.DrawFrame(&render_passes_in_draw_order_,
                     1.f,
                     viewport_rect,
                     viewport_rect,
                     false);

  // In multiple render passes all but the root pass should clear the
  // framebuffer.
  Mock::VerifyAndClearExpectations(&mock_context);
}

class ScissorTestOnClearCheckingContext : public TestWebGraphicsContext3D {
 public:
  ScissorTestOnClearCheckingContext() : scissor_enabled_(false) {}

  void clear(GLbitfield) override { EXPECT_FALSE(scissor_enabled_); }

  void enable(GLenum cap) override {
    if (cap == GL_SCISSOR_TEST)
      scissor_enabled_ = true;
  }

  void disable(GLenum cap) override {
    if (cap == GL_SCISSOR_TEST)
      scissor_enabled_ = false;
  }

 private:
  bool scissor_enabled_;
};

TEST_F(GLRendererTest, ScissorTestWhenClearing) {
  scoped_ptr<ScissorTestOnClearCheckingContext> context_owned(
      new ScissorTestOnClearCheckingContext);

  FakeOutputSurfaceClient output_surface_client;
  scoped_ptr<OutputSurface> output_surface(
      FakeOutputSurface::Create3d(context_owned.Pass()));
  CHECK(output_surface->BindToClient(&output_surface_client));

  scoped_ptr<SharedBitmapManager> shared_bitmap_manager(
      new TestSharedBitmapManager());
  scoped_ptr<ResourceProvider> resource_provider(
      ResourceProvider::Create(output_surface.get(),
                               shared_bitmap_manager.get(),
                               NULL,
                               NULL,
                               0,
                               false,
                               1));

  LayerTreeSettings settings;
  FakeRendererClient renderer_client;
  FakeRendererGL renderer(&renderer_client,
                          &settings,
                          output_surface.get(),
                          resource_provider.get());
  EXPECT_FALSE(renderer.Capabilities().using_partial_swap);

  gfx::Rect viewport_rect(1, 1);

  gfx::Rect grand_child_rect(25, 25);
  RenderPassId grand_child_pass_id(3, 0);
  TestRenderPass* grand_child_pass =
      AddRenderPass(&render_passes_in_draw_order_,
                    grand_child_pass_id,
                    grand_child_rect,
                    gfx::Transform());
  AddClippedQuad(grand_child_pass, grand_child_rect, SK_ColorYELLOW);

  gfx::Rect child_rect(50, 50);
  RenderPassId child_pass_id(2, 0);
  TestRenderPass* child_pass = AddRenderPass(&render_passes_in_draw_order_,
                                             child_pass_id,
                                             child_rect,
                                             gfx::Transform());
  AddQuad(child_pass, child_rect, SK_ColorBLUE);

  RenderPassId root_pass_id(1, 0);
  TestRenderPass* root_pass = AddRenderPass(&render_passes_in_draw_order_,
                                            root_pass_id,
                                            viewport_rect,
                                            gfx::Transform());
  AddQuad(root_pass, viewport_rect, SK_ColorGREEN);

  AddRenderPassQuad(root_pass, child_pass);
  AddRenderPassQuad(child_pass, grand_child_pass);

  renderer.DecideRenderPassAllocationsForFrame(render_passes_in_draw_order_);
  renderer.DrawFrame(&render_passes_in_draw_order_,
                     1.f,
                     viewport_rect,
                     viewport_rect,
                     false);
}

class DiscardCheckingContext : public TestWebGraphicsContext3D {
 public:
  DiscardCheckingContext() : discarded_(0) {
    set_have_post_sub_buffer(true);
    set_have_discard_framebuffer(true);
  }

  void discardFramebufferEXT(GLenum target,
                             GLsizei numAttachments,
                             const GLenum* attachments) override {
    ++discarded_;
  }

  int discarded() const { return discarded_; }
  void reset() { discarded_ = 0; }

 private:
  int discarded_;
};

class NonReshapableOutputSurface : public FakeOutputSurface {
 public:
  explicit NonReshapableOutputSurface(
      scoped_ptr<TestWebGraphicsContext3D> context3d)
      : FakeOutputSurface(TestContextProvider::Create(context3d.Pass()),
                          false) {
    surface_size_ = gfx::Size(500, 500);
  }
  void Reshape(const gfx::Size& size, float scale_factor) override {}
  void set_fixed_size(const gfx::Size& size) { surface_size_ = size; }
};

TEST_F(GLRendererTest, NoDiscardOnPartialUpdates) {
  scoped_ptr<DiscardCheckingContext> context_owned(new DiscardCheckingContext);
  DiscardCheckingContext* context = context_owned.get();

  FakeOutputSurfaceClient output_surface_client;
  scoped_ptr<NonReshapableOutputSurface> output_surface(
      new NonReshapableOutputSurface(context_owned.Pass()));
  CHECK(output_surface->BindToClient(&output_surface_client));
  output_surface->set_fixed_size(gfx::Size(100, 100));

  scoped_ptr<SharedBitmapManager> shared_bitmap_manager(
      new TestSharedBitmapManager());
  scoped_ptr<ResourceProvider> resource_provider(
      ResourceProvider::Create(output_surface.get(),
                               shared_bitmap_manager.get(),
                               NULL,
                               NULL,
                               0,
                               false,
                               1));

  LayerTreeSettings settings;
  settings.partial_swap_enabled = true;
  FakeRendererClient renderer_client;
  FakeRendererGL renderer(&renderer_client,
                          &settings,
                          output_surface.get(),
                          resource_provider.get());
  EXPECT_TRUE(renderer.Capabilities().using_partial_swap);

  gfx::Rect viewport_rect(100, 100);
  gfx::Rect clip_rect(100, 100);

  {
    // Partial frame, should not discard.
    RenderPassId root_pass_id(1, 0);
    TestRenderPass* root_pass = AddRenderPass(&render_passes_in_draw_order_,
                                              root_pass_id,
                                              viewport_rect,
                                              gfx::Transform());
    AddQuad(root_pass, viewport_rect, SK_ColorGREEN);
    root_pass->damage_rect = gfx::Rect(2, 2, 3, 3);

    renderer.DecideRenderPassAllocationsForFrame(render_passes_in_draw_order_);
    renderer.DrawFrame(&render_passes_in_draw_order_,
                       1.f,
                       viewport_rect,
                       clip_rect,
                       false);
    EXPECT_EQ(0, context->discarded());
    context->reset();
  }
  {
    // Full frame, should discard.
    RenderPassId root_pass_id(1, 0);
    TestRenderPass* root_pass = AddRenderPass(&render_passes_in_draw_order_,
                                              root_pass_id,
                                              viewport_rect,
                                              gfx::Transform());
    AddQuad(root_pass, viewport_rect, SK_ColorGREEN);
    root_pass->damage_rect = root_pass->output_rect;

    renderer.DecideRenderPassAllocationsForFrame(render_passes_in_draw_order_);
    renderer.DrawFrame(&render_passes_in_draw_order_,
                       1.f,
                       viewport_rect,
                       clip_rect,
                       false);
    EXPECT_EQ(1, context->discarded());
    context->reset();
  }
  {
    // Full frame, external scissor is set, should not discard.
    output_surface->set_has_external_stencil_test(true);
    RenderPassId root_pass_id(1, 0);
    TestRenderPass* root_pass = AddRenderPass(&render_passes_in_draw_order_,
                                              root_pass_id,
                                              viewport_rect,
                                              gfx::Transform());
    AddQuad(root_pass, viewport_rect, SK_ColorGREEN);
    root_pass->damage_rect = root_pass->output_rect;
    root_pass->has_transparent_background = false;

    renderer.DecideRenderPassAllocationsForFrame(render_passes_in_draw_order_);
    renderer.DrawFrame(&render_passes_in_draw_order_,
                       1.f,
                       viewport_rect,
                       clip_rect,
                       false);
    EXPECT_EQ(0, context->discarded());
    context->reset();
    output_surface->set_has_external_stencil_test(false);
  }
  {
    // Full frame, clipped, should not discard.
    clip_rect = gfx::Rect(10, 10, 10, 10);
    RenderPassId root_pass_id(1, 0);
    TestRenderPass* root_pass = AddRenderPass(&render_passes_in_draw_order_,
                                              root_pass_id,
                                              viewport_rect,
                                              gfx::Transform());
    AddQuad(root_pass, viewport_rect, SK_ColorGREEN);
    root_pass->damage_rect = root_pass->output_rect;

    renderer.DecideRenderPassAllocationsForFrame(render_passes_in_draw_order_);
    renderer.DrawFrame(&render_passes_in_draw_order_,
                       1.f,
                       viewport_rect,
                       clip_rect,
                       false);
    EXPECT_EQ(0, context->discarded());
    context->reset();
  }
  {
    // Full frame, doesn't cover the surface, should not discard.
    viewport_rect = gfx::Rect(10, 10, 10, 10);
    RenderPassId root_pass_id(1, 0);
    TestRenderPass* root_pass = AddRenderPass(&render_passes_in_draw_order_,
                                              root_pass_id,
                                              viewport_rect,
                                              gfx::Transform());
    AddQuad(root_pass, viewport_rect, SK_ColorGREEN);
    root_pass->damage_rect = root_pass->output_rect;

    renderer.DecideRenderPassAllocationsForFrame(render_passes_in_draw_order_);
    renderer.DrawFrame(&render_passes_in_draw_order_,
                       1.f,
                       viewport_rect,
                       clip_rect,
                       false);
    EXPECT_EQ(0, context->discarded());
    context->reset();
  }
  {
    // Full frame, doesn't cover the surface (no offset), should not discard.
    clip_rect = gfx::Rect(100, 100);
    viewport_rect = gfx::Rect(50, 50);
    RenderPassId root_pass_id(1, 0);
    TestRenderPass* root_pass = AddRenderPass(&render_passes_in_draw_order_,
                                              root_pass_id,
                                              viewport_rect,
                                              gfx::Transform());
    AddQuad(root_pass, viewport_rect, SK_ColorGREEN);
    root_pass->damage_rect = root_pass->output_rect;

    renderer.DecideRenderPassAllocationsForFrame(render_passes_in_draw_order_);
    renderer.DrawFrame(&render_passes_in_draw_order_,
                       1.f,
                       viewport_rect,
                       clip_rect,
                       false);
    EXPECT_EQ(0, context->discarded());
    context->reset();
  }
}

class FlippedScissorAndViewportContext : public TestWebGraphicsContext3D {
 public:
  FlippedScissorAndViewportContext()
      : did_call_viewport_(false), did_call_scissor_(false) {}
  ~FlippedScissorAndViewportContext() override {
    EXPECT_TRUE(did_call_viewport_);
    EXPECT_TRUE(did_call_scissor_);
  }

  void viewport(GLint x, GLint y, GLsizei width, GLsizei height) override {
    EXPECT_EQ(10, x);
    EXPECT_EQ(390, y);
    EXPECT_EQ(100, width);
    EXPECT_EQ(100, height);
    did_call_viewport_ = true;
  }

  void scissor(GLint x, GLint y, GLsizei width, GLsizei height) override {
    EXPECT_EQ(30, x);
    EXPECT_EQ(450, y);
    EXPECT_EQ(20, width);
    EXPECT_EQ(20, height);
    did_call_scissor_ = true;
  }

 private:
  bool did_call_viewport_;
  bool did_call_scissor_;
};

TEST_F(GLRendererTest, ScissorAndViewportWithinNonreshapableSurface) {
  // In Android WebView, the OutputSurface is unable to respect reshape() calls
  // and maintains a fixed size. This test verifies that glViewport and
  // glScissor's Y coordinate is flipped correctly in this environment, and that
  // the glViewport can be at a nonzero origin within the surface.
  scoped_ptr<FlippedScissorAndViewportContext> context_owned(
      new FlippedScissorAndViewportContext);

  FakeOutputSurfaceClient output_surface_client;
  scoped_ptr<OutputSurface> output_surface(
      new NonReshapableOutputSurface(context_owned.Pass()));
  CHECK(output_surface->BindToClient(&output_surface_client));

  scoped_ptr<SharedBitmapManager> shared_bitmap_manager(
      new TestSharedBitmapManager());
  scoped_ptr<ResourceProvider> resource_provider(
      ResourceProvider::Create(output_surface.get(),
                               shared_bitmap_manager.get(),
                               NULL,
                               NULL,
                               0,
                               false,
                               1));

  LayerTreeSettings settings;
  FakeRendererClient renderer_client;
  FakeRendererGL renderer(&renderer_client,
                          &settings,
                          output_surface.get(),
                          resource_provider.get());
  EXPECT_FALSE(renderer.Capabilities().using_partial_swap);

  gfx::Rect device_viewport_rect(10, 10, 100, 100);
  gfx::Rect viewport_rect(device_viewport_rect.size());
  gfx::Rect quad_rect = gfx::Rect(20, 20, 20, 20);

  RenderPassId root_pass_id(1, 0);
  TestRenderPass* root_pass = AddRenderPass(&render_passes_in_draw_order_,
                                            root_pass_id,
                                            viewport_rect,
                                            gfx::Transform());
  AddClippedQuad(root_pass, quad_rect, SK_ColorGREEN);

  renderer.DecideRenderPassAllocationsForFrame(render_passes_in_draw_order_);
  renderer.DrawFrame(&render_passes_in_draw_order_,
                     1.f,
                     device_viewport_rect,
                     device_viewport_rect,
                     false);
}

TEST_F(GLRendererShaderTest, DrawRenderPassQuadShaderPermutations) {
  gfx::Rect viewport_rect(1, 1);

  gfx::Rect child_rect(50, 50);
  RenderPassId child_pass_id(2, 0);
  TestRenderPass* child_pass;

  RenderPassId root_pass_id(1, 0);
  TestRenderPass* root_pass;

  ResourceProvider::ResourceId mask = resource_provider_->CreateResource(
      gfx::Size(20, 12),
      GL_CLAMP_TO_EDGE,
      ResourceProvider::TextureHintImmutable,
      resource_provider_->best_texture_format());
  resource_provider_->AllocateForTesting(mask);

  SkScalar matrix[20];
  float amount = 0.5f;
  matrix[0] = 0.213f + 0.787f * amount;
  matrix[1] = 0.715f - 0.715f * amount;
  matrix[2] = 1.f - (matrix[0] + matrix[1]);
  matrix[3] = matrix[4] = 0;
  matrix[5] = 0.213f - 0.213f * amount;
  matrix[6] = 0.715f + 0.285f * amount;
  matrix[7] = 1.f - (matrix[5] + matrix[6]);
  matrix[8] = matrix[9] = 0;
  matrix[10] = 0.213f - 0.213f * amount;
  matrix[11] = 0.715f - 0.715f * amount;
  matrix[12] = 1.f - (matrix[10] + matrix[11]);
  matrix[13] = matrix[14] = 0;
  matrix[15] = matrix[16] = matrix[17] = matrix[19] = 0;
  matrix[18] = 1;
  skia::RefPtr<SkColorFilter> color_filter(
      skia::AdoptRef(SkColorMatrixFilter::Create(matrix)));
  skia::RefPtr<SkImageFilter> filter = skia::AdoptRef(
      SkColorFilterImageFilter::Create(color_filter.get(), NULL));
  FilterOperations filters;
  filters.Append(FilterOperation::CreateReferenceFilter(filter));

  gfx::Transform transform_causing_aa;
  transform_causing_aa.Rotate(20.0);

  for (int i = 0; i < NumBlendModes; ++i) {
    BlendMode blend_mode = static_cast<BlendMode>(i);
    SkXfermode::Mode xfer_mode = BlendModeToSkXfermode(blend_mode);
    settings_.force_blending_with_shaders = (blend_mode != BlendModeNone);
    // RenderPassProgram
    render_passes_in_draw_order_.clear();
    child_pass = AddRenderPass(&render_passes_in_draw_order_,
                               child_pass_id,
                               child_rect,
                               gfx::Transform());

    root_pass = AddRenderPass(&render_passes_in_draw_order_,
                              root_pass_id,
                              viewport_rect,
                              gfx::Transform());

    AddRenderPassQuad(root_pass,
                      child_pass,
                      0,
                      FilterOperations(),
                      gfx::Transform(),
                      xfer_mode);

    renderer_->DecideRenderPassAllocationsForFrame(
        render_passes_in_draw_order_);
    renderer_->DrawFrame(&render_passes_in_draw_order_,
                         1.f,
                         viewport_rect,
                         viewport_rect,
                         false);
    TestRenderPassProgram(TexCoordPrecisionMedium, blend_mode);

    // RenderPassColorMatrixProgram
    render_passes_in_draw_order_.clear();

    child_pass = AddRenderPass(&render_passes_in_draw_order_,
                               child_pass_id,
                               child_rect,
                               transform_causing_aa);

    root_pass = AddRenderPass(&render_passes_in_draw_order_,
                              root_pass_id,
                              viewport_rect,
                              gfx::Transform());

    AddRenderPassQuad(
        root_pass, child_pass, 0, filters, gfx::Transform(), xfer_mode);

    renderer_->DecideRenderPassAllocationsForFrame(
        render_passes_in_draw_order_);
    renderer_->DrawFrame(&render_passes_in_draw_order_,
                         1.f,
                         viewport_rect,
                         viewport_rect,
                         false);
    TestRenderPassColorMatrixProgram(TexCoordPrecisionMedium, blend_mode);

    // RenderPassMaskProgram
    render_passes_in_draw_order_.clear();

    child_pass = AddRenderPass(&render_passes_in_draw_order_,
                               child_pass_id,
                               child_rect,
                               gfx::Transform());

    root_pass = AddRenderPass(&render_passes_in_draw_order_,
                              root_pass_id,
                              viewport_rect,
                              gfx::Transform());

    AddRenderPassQuad(root_pass,
                      child_pass,
                      mask,
                      FilterOperations(),
                      gfx::Transform(),
                      xfer_mode);

    renderer_->DecideRenderPassAllocationsForFrame(
        render_passes_in_draw_order_);
    renderer_->DrawFrame(&render_passes_in_draw_order_,
                         1.f,
                         viewport_rect,
                         viewport_rect,
                         false);
    TestRenderPassMaskProgram(
        TexCoordPrecisionMedium, SamplerType2D, blend_mode);

    // RenderPassMaskColorMatrixProgram
    render_passes_in_draw_order_.clear();

    child_pass = AddRenderPass(&render_passes_in_draw_order_,
                               child_pass_id,
                               child_rect,
                               gfx::Transform());

    root_pass = AddRenderPass(&render_passes_in_draw_order_,
                              root_pass_id,
                              viewport_rect,
                              gfx::Transform());

    AddRenderPassQuad(
        root_pass, child_pass, mask, filters, gfx::Transform(), xfer_mode);

    renderer_->DecideRenderPassAllocationsForFrame(
        render_passes_in_draw_order_);
    renderer_->DrawFrame(&render_passes_in_draw_order_,
                         1.f,
                         viewport_rect,
                         viewport_rect,
                         false);
    TestRenderPassMaskColorMatrixProgram(
        TexCoordPrecisionMedium, SamplerType2D, blend_mode);

    // RenderPassProgramAA
    render_passes_in_draw_order_.clear();

    child_pass = AddRenderPass(&render_passes_in_draw_order_,
                               child_pass_id,
                               child_rect,
                               transform_causing_aa);

    root_pass = AddRenderPass(&render_passes_in_draw_order_,
                              root_pass_id,
                              viewport_rect,
                              gfx::Transform());

    AddRenderPassQuad(root_pass,
                      child_pass,
                      0,
                      FilterOperations(),
                      transform_causing_aa,
                      xfer_mode);

    renderer_->DecideRenderPassAllocationsForFrame(
        render_passes_in_draw_order_);
    renderer_->DrawFrame(&render_passes_in_draw_order_,
                         1.f,
                         viewport_rect,
                         viewport_rect,
                         false);
    TestRenderPassProgramAA(TexCoordPrecisionMedium, blend_mode);

    // RenderPassColorMatrixProgramAA
    render_passes_in_draw_order_.clear();

    child_pass = AddRenderPass(&render_passes_in_draw_order_,
                               child_pass_id,
                               child_rect,
                               transform_causing_aa);

    root_pass = AddRenderPass(&render_passes_in_draw_order_,
                              root_pass_id,
                              viewport_rect,
                              gfx::Transform());

    AddRenderPassQuad(
        root_pass, child_pass, 0, filters, transform_causing_aa, xfer_mode);

    renderer_->DecideRenderPassAllocationsForFrame(
        render_passes_in_draw_order_);
    renderer_->DrawFrame(&render_passes_in_draw_order_,
                         1.f,
                         viewport_rect,
                         viewport_rect,
                         false);
    TestRenderPassColorMatrixProgramAA(TexCoordPrecisionMedium, blend_mode);

    // RenderPassMaskProgramAA
    render_passes_in_draw_order_.clear();

    child_pass = AddRenderPass(&render_passes_in_draw_order_,
                               child_pass_id,
                               child_rect,
                               transform_causing_aa);

    root_pass = AddRenderPass(&render_passes_in_draw_order_,
                              root_pass_id,
                              viewport_rect,
                              gfx::Transform());

    AddRenderPassQuad(root_pass,
                      child_pass,
                      mask,
                      FilterOperations(),
                      transform_causing_aa,
                      xfer_mode);

    renderer_->DecideRenderPassAllocationsForFrame(
        render_passes_in_draw_order_);
    renderer_->DrawFrame(&render_passes_in_draw_order_,
                         1.f,
                         viewport_rect,
                         viewport_rect,
                         false);
    TestRenderPassMaskProgramAA(
        TexCoordPrecisionMedium, SamplerType2D, blend_mode);

    // RenderPassMaskColorMatrixProgramAA
    render_passes_in_draw_order_.clear();

    child_pass = AddRenderPass(&render_passes_in_draw_order_,
                               child_pass_id,
                               child_rect,
                               transform_causing_aa);

    root_pass = AddRenderPass(&render_passes_in_draw_order_,
                              root_pass_id,
                              viewport_rect,
                              transform_causing_aa);

    AddRenderPassQuad(
        root_pass, child_pass, mask, filters, transform_causing_aa, xfer_mode);

    renderer_->DecideRenderPassAllocationsForFrame(
        render_passes_in_draw_order_);
    renderer_->DrawFrame(&render_passes_in_draw_order_,
                         1.f,
                         viewport_rect,
                         viewport_rect,
                         false);
    TestRenderPassMaskColorMatrixProgramAA(
        TexCoordPrecisionMedium, SamplerType2D, blend_mode);
  }
}

// At this time, the AA code path cannot be taken if the surface's rect would
// project incorrectly by the given transform, because of w<0 clipping.
TEST_F(GLRendererShaderTest, DrawRenderPassQuadSkipsAAForClippingTransform) {
  gfx::Rect child_rect(50, 50);
  RenderPassId child_pass_id(2, 0);
  TestRenderPass* child_pass;

  gfx::Rect viewport_rect(1, 1);
  RenderPassId root_pass_id(1, 0);
  TestRenderPass* root_pass;

  gfx::Transform transform_preventing_aa;
  transform_preventing_aa.ApplyPerspectiveDepth(40.0);
  transform_preventing_aa.RotateAboutYAxis(-20.0);
  transform_preventing_aa.Scale(30.0, 1.0);

  // Verify that the test transform and test rect actually do cause the clipped
  // flag to trigger. Otherwise we are not testing the intended scenario.
  bool clipped = false;
  MathUtil::MapQuad(transform_preventing_aa, gfx::QuadF(child_rect), &clipped);
  ASSERT_TRUE(clipped);

  child_pass = AddRenderPass(&render_passes_in_draw_order_,
                             child_pass_id,
                             child_rect,
                             transform_preventing_aa);

  root_pass = AddRenderPass(&render_passes_in_draw_order_,
                            root_pass_id,
                            viewport_rect,
                            gfx::Transform());

  AddRenderPassQuad(root_pass,
                    child_pass,
                    0,
                    FilterOperations(),
                    transform_preventing_aa,
                    SkXfermode::kSrcOver_Mode);

  renderer_->DecideRenderPassAllocationsForFrame(render_passes_in_draw_order_);
  renderer_->DrawFrame(&render_passes_in_draw_order_,
                       1.f,
                       viewport_rect,
                       viewport_rect,
                       false);

  // If use_aa incorrectly ignores clipping, it will use the
  // RenderPassProgramAA shader instead of the RenderPassProgram.
  TestRenderPassProgram(TexCoordPrecisionMedium, BlendModeNone);
}

TEST_F(GLRendererShaderTest, DrawSolidColorShader) {
  gfx::Rect viewport_rect(1, 1);
  RenderPassId root_pass_id(1, 0);
  TestRenderPass* root_pass;

  gfx::Transform pixel_aligned_transform_causing_aa;
  pixel_aligned_transform_causing_aa.Translate(25.5f, 25.5f);
  pixel_aligned_transform_causing_aa.Scale(0.5f, 0.5f);

  root_pass = AddRenderPass(&render_passes_in_draw_order_,
                            root_pass_id,
                            viewport_rect,
                            gfx::Transform());
  AddTransformedQuad(root_pass,
                     viewport_rect,
                     SK_ColorYELLOW,
                     pixel_aligned_transform_causing_aa);

  renderer_->DecideRenderPassAllocationsForFrame(render_passes_in_draw_order_);
  renderer_->DrawFrame(&render_passes_in_draw_order_,
                       1.f,
                       viewport_rect,
                       viewport_rect,
                       false);

  TestSolidColorProgramAA();
}

class OutputSurfaceMockContext : public TestWebGraphicsContext3D {
 public:
  OutputSurfaceMockContext() { test_capabilities_.gpu.post_sub_buffer = true; }

  // Specifically override methods even if they are unused (used in conjunction
  // with StrictMock). We need to make sure that GLRenderer does not issue
  // framebuffer-related GLuint calls directly. Instead these are supposed to go
  // through the OutputSurface abstraction.
  MOCK_METHOD2(bindFramebuffer, void(GLenum target, GLuint framebuffer));
  MOCK_METHOD3(reshapeWithScaleFactor,
               void(int width, int height, float scale_factor));
  MOCK_METHOD4(drawElements,
               void(GLenum mode, GLsizei count, GLenum type, GLintptr offset));
};

class MockOutputSurface : public OutputSurface {
 public:
  MockOutputSurface()
      : OutputSurface(
            TestContextProvider::Create(scoped_ptr<TestWebGraphicsContext3D>(
                new StrictMock<OutputSurfaceMockContext>))) {
    surface_size_ = gfx::Size(100, 100);
  }
  virtual ~MockOutputSurface() {}

  MOCK_METHOD0(EnsureBackbuffer, void());
  MOCK_METHOD0(DiscardBackbuffer, void());
  MOCK_METHOD2(Reshape, void(const gfx::Size& size, float scale_factor));
  MOCK_METHOD0(BindFramebuffer, void());
  MOCK_METHOD1(SwapBuffers, void(CompositorFrame* frame));
};

class MockOutputSurfaceTest : public GLRendererTest {
 protected:
  virtual void SetUp() {
    FakeOutputSurfaceClient output_surface_client_;
    CHECK(output_surface_.BindToClient(&output_surface_client_));

    shared_bitmap_manager_.reset(new TestSharedBitmapManager());
    resource_provider_ = ResourceProvider::Create(&output_surface_,
                                                  shared_bitmap_manager_.get(),
                                                  NULL,
                                                  NULL,
                                                  0,
                                                  false,
                                                  1).Pass();

    renderer_.reset(new FakeRendererGL(&renderer_client_,
                                       &settings_,
                                       &output_surface_,
                                       resource_provider_.get()));
  }

  void SwapBuffers() { renderer_->SwapBuffers(CompositorFrameMetadata()); }

  void DrawFrame(float device_scale_factor,
                 const gfx::Rect& device_viewport_rect) {
    RenderPassId render_pass_id(1, 0);
    TestRenderPass* render_pass = AddRenderPass(&render_passes_in_draw_order_,
                                                render_pass_id,
                                                device_viewport_rect,
                                                gfx::Transform());
    AddQuad(render_pass, device_viewport_rect, SK_ColorGREEN);

    EXPECT_CALL(output_surface_, EnsureBackbuffer()).WillRepeatedly(Return());

    EXPECT_CALL(output_surface_,
                Reshape(device_viewport_rect.size(), device_scale_factor))
        .Times(1);

    EXPECT_CALL(output_surface_, BindFramebuffer()).Times(1);

    EXPECT_CALL(*Context(), drawElements(_, _, _, _)).Times(1);

    renderer_->DecideRenderPassAllocationsForFrame(
        render_passes_in_draw_order_);
    renderer_->DrawFrame(&render_passes_in_draw_order_,
                         device_scale_factor,
                         device_viewport_rect,
                         device_viewport_rect,
                         false);
  }

  OutputSurfaceMockContext* Context() {
    return static_cast<OutputSurfaceMockContext*>(
        static_cast<TestContextProvider*>(output_surface_.context_provider())
            ->TestContext3d());
  }

  LayerTreeSettings settings_;
  FakeOutputSurfaceClient output_surface_client_;
  StrictMock<MockOutputSurface> output_surface_;
  scoped_ptr<SharedBitmapManager> shared_bitmap_manager_;
  scoped_ptr<ResourceProvider> resource_provider_;
  FakeRendererClient renderer_client_;
  scoped_ptr<FakeRendererGL> renderer_;
};

TEST_F(MockOutputSurfaceTest, DrawFrameAndSwap) {
  gfx::Rect device_viewport_rect(1, 1);
  DrawFrame(1.f, device_viewport_rect);

  EXPECT_CALL(output_surface_, SwapBuffers(_)).Times(1);
  renderer_->SwapBuffers(CompositorFrameMetadata());
}

TEST_F(MockOutputSurfaceTest, DrawFrameAndResizeAndSwap) {
  gfx::Rect device_viewport_rect(1, 1);

  DrawFrame(1.f, device_viewport_rect);
  EXPECT_CALL(output_surface_, SwapBuffers(_)).Times(1);
  renderer_->SwapBuffers(CompositorFrameMetadata());

  device_viewport_rect = gfx::Rect(2, 2);

  DrawFrame(2.f, device_viewport_rect);
  EXPECT_CALL(output_surface_, SwapBuffers(_)).Times(1);
  renderer_->SwapBuffers(CompositorFrameMetadata());

  DrawFrame(2.f, device_viewport_rect);
  EXPECT_CALL(output_surface_, SwapBuffers(_)).Times(1);
  renderer_->SwapBuffers(CompositorFrameMetadata());

  device_viewport_rect = gfx::Rect(1, 1);

  DrawFrame(1.f, device_viewport_rect);
  EXPECT_CALL(output_surface_, SwapBuffers(_)).Times(1);
  renderer_->SwapBuffers(CompositorFrameMetadata());
}

class GLRendererTestSyncPoint : public GLRendererPixelTest {
 protected:
  static void SyncPointCallback(int* callback_count) {
    ++(*callback_count);
    base::MessageLoop::current()->QuitWhenIdle();
  }

  static void OtherCallback(int* callback_count) {
    ++(*callback_count);
    base::MessageLoop::current()->QuitWhenIdle();
  }
};

#if !defined(OS_ANDROID)
TEST_F(GLRendererTestSyncPoint, SignalSyncPointOnLostContext) {
  int sync_point_callback_count = 0;
  int other_callback_count = 0;
  gpu::gles2::GLES2Interface* gl =
      output_surface_->context_provider()->ContextGL();
  gpu::ContextSupport* context_support =
      output_surface_->context_provider()->ContextSupport();

  uint32 sync_point = gl->InsertSyncPointCHROMIUM();

  gl->LoseContextCHROMIUM(GL_GUILTY_CONTEXT_RESET_ARB,
                          GL_INNOCENT_CONTEXT_RESET_ARB);

  context_support->SignalSyncPoint(
      sync_point, base::Bind(&SyncPointCallback, &sync_point_callback_count));
  EXPECT_EQ(0, sync_point_callback_count);
  EXPECT_EQ(0, other_callback_count);

  // Make the sync point happen.
  gl->Finish();
  // Post a task after the sync point.
  base::MessageLoop::current()->PostTask(
      FROM_HERE, base::Bind(&OtherCallback, &other_callback_count));

  base::MessageLoop::current()->Run();

  // The sync point shouldn't have happened since the context was lost.
  EXPECT_EQ(0, sync_point_callback_count);
  EXPECT_EQ(1, other_callback_count);
}

TEST_F(GLRendererTestSyncPoint, SignalSyncPoint) {
  int sync_point_callback_count = 0;
  int other_callback_count = 0;

  gpu::gles2::GLES2Interface* gl =
      output_surface_->context_provider()->ContextGL();
  gpu::ContextSupport* context_support =
      output_surface_->context_provider()->ContextSupport();

  uint32 sync_point = gl->InsertSyncPointCHROMIUM();

  context_support->SignalSyncPoint(
      sync_point, base::Bind(&SyncPointCallback, &sync_point_callback_count));
  EXPECT_EQ(0, sync_point_callback_count);
  EXPECT_EQ(0, other_callback_count);

  // Make the sync point happen.
  gl->Finish();
  // Post a task after the sync point.
  base::MessageLoop::current()->PostTask(
      FROM_HERE, base::Bind(&OtherCallback, &other_callback_count));

  base::MessageLoop::current()->Run();

  // The sync point should have happened.
  EXPECT_EQ(1, sync_point_callback_count);
  EXPECT_EQ(1, other_callback_count);
}
#endif  // OS_ANDROID

}  // namespace
}  // namespace cc