mus+ash: Enable Chrome HW rendering in mus+ash

content/browser/compositor/mus_browser_compositor_output_surface.cc

Index: content/browser/compositor/mus_browser_compositor_output_surface.cc
diff --git a/content/browser/compositor/mus_browser_compositor_output_surface.cc b/content/browser/compositor/mus_browser_compositor_output_surface.cc
new file mode 100644
index 0000000000000000000000000000000000000000..de3f887b4086cf575fadd08122ca3aa50dcd7a37
--- /dev/null
+++ b/content/browser/compositor/mus_browser_compositor_output_surface.cc
@@ -0,0 +1,176 @@
+// Copyright 2016 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 "content/browser/compositor/mus_browser_compositor_output_surface.h"
+
+#include <utility>
+
+#include "build/build_config.h"
+#include "cc/output/compositor_frame.h"
+#include "cc/output/compositor_frame_ack.h"
+#include "cc/output/output_surface_client.h"
+#include "cc/quads/render_pass.h"
+#include "cc/quads/texture_draw_quad.h"
+#include "components/display_compositor/compositor_overlay_candidate_validator.h"
+#include "components/mus/common/gpu_service.h"
+#include "components/mus/public/cpp/window.h"
+#include "components/mus/public/cpp/window_surface.h"
+#include "content/browser/compositor/reflector_impl.h"
+#include "content/browser/compositor/reflector_texture.h"
+#include "content/browser/renderer_host/render_widget_host_impl.h"
+#include "content/common/gpu/client/context_provider_command_buffer.h"
+#include "gpu/command_buffer/client/context_support.h"
+#include "gpu/command_buffer/client/gles2_interface.h"
+#include "gpu/ipc/client/command_buffer_proxy_impl.h"
+#include "ui/views/mus/native_widget_mus.h"
+#include "ui/views/mus/window_tree_host_mus.h"
+
+namespace content {
+
+MusBrowserCompositorOutputSurface::MusBrowserCompositorOutputSurface(
+    gpu::SurfaceHandle surface_handle,
+    scoped_refptr<ContextProviderCommandBuffer> context,
+    scoped_refptr<ui::CompositorVSyncManager> vsync_manager,
+    cc::SyntheticBeginFrameSource* begin_frame_source,
+    std::unique_ptr<display_compositor::CompositorOverlayCandidateValidator>
+        overlay_candidate_validator)
+    : GpuBrowserCompositorOutputSurface(std::move(context),
+                                        std::move(vsync_manager),
+                                        begin_frame_source,
+                                        std::move(overlay_candidate_validator)),
+      mus_window_(nullptr) {
+  DCHECK(mus::GpuService::UseChromeGpuCommandBuffer());
+  views::WindowTreeHostMus* window_tree_host =
+      static_cast<views::WindowTreeHostMus*>(
+          aura::WindowTreeHost::GetForAcceleratedWidget(surface_handle));
+  mus_window_ = window_tree_host->native_widget()->window();
+  mus_window_surface_ =
+      mus_window_->RequestSurface(mus::mojom::SurfaceType::DEFAULT);
+}
+
+MusBrowserCompositorOutputSurface::~MusBrowserCompositorOutputSurface() {}
+
+void MusBrowserCompositorOutputSurface::SwapBuffers(cc::CompositorFrame frame) {
+  const gfx::Rect bounds(mus_window_->bounds().size());
+  cc::CompositorFrame mus_frame;
+  mus_frame.metadata.device_scale_factor = 1.0f;
+  mus_frame.delegated_frame_data = base::MakeUnique<cc::DelegatedFrameData>();
+  mus_frame.delegated_frame_data->resource_list.resize(0u);
+  const cc::RenderPassId render_pass_id(1, 1);
+  std::unique_ptr<cc::RenderPass> pass = cc::RenderPass::Create();
+  const bool has_transparent_background = true;
+  pass->SetAll(render_pass_id, bounds, bounds, gfx::Transform(),
+               has_transparent_background);
+  // The SharedQuadState is owned by the SharedQuadStateList
+  // shared_quad_state_list.
+  cc::SharedQuadState* sqs = pass->CreateAndAppendSharedQuadState();
+  sqs->SetAll(gfx::Transform(), bounds.size(), bounds, bounds,
+              false /* is_clipped */, 1.f /* opacity */, SkXfermode::kSrc_Mode,
+              0 /* sorting_context_id */);
+
+  cc::TransferableResource resource;
+  resource.id = AllocateResourceId();
+  resource.format = cc::ResourceFormat::RGBA_8888;
+  resource.filter = GL_LINEAR;
+  resource.size = frame.gl_frame_data->size;
+
+  const gpu::Mailbox& mailbox = GetMailboxFromResourceId(resource.id);
+  DCHECK(!mailbox.IsZero());
+  const gfx::Rect rect(frame.gl_frame_data->size);
+
+  // Call parent's SwapBuffers to generate the front buffer, and then send the
+  // front buffer to mus.
+  // TODO(penghuang): we should avoid extra copies here by sending frames to mus
+  // directly from renderer.
+  GpuBrowserCompositorOutputSurface::SwapBuffers(std::move(frame));
+  GetCommandBufferProxy()->TakeFrontBuffer(mailbox);

[Fady Samuel, 2016/06/30 20:28:04]

Question for my own edification: Does this mean we pull the FBO output of
GLRenderer and stick a reference to it in a TextureDrawQuad and give it to Mus?

[Peng, 2016/06/30 20:49:07]

As my understanding, for the chrome offscreen chrome gl context, we draw on one
back buffer (FBO), when the SwapBuffers() is called, we copy it into a front
buffer by default. The TakeFrontBuffer() will borrow the texture of the front
buffer from the context, and return if when it is not used anymore. See [1] &
[2] for detail. But we can override the behavior by using
attributes.buffer_preserved = false when create the context. But I am not sure
why we use attributes.buffer_preserved = true by default, it will cause an extra
texture copy I think.

[1]
https://cs.chromium.org/chromium/src/gpu/command_buffer/service/gles2_cmd_dec...
[2]
https://cs.chromium.org/chromium/src/gpu/command_buffer/service/gles2_cmd_dec...

[piman, 2016/06/30 20:56:31]

Yes, please, set it to false. The default is true because that's the EGL
default, but you most likely don't want the preserved behavior.

+
+  auto* gl = context_provider()->ContextGL();
+  const GLuint64 fence_sync = gl->InsertFenceSyncCHROMIUM();
+  gl->ShallowFlushCHROMIUM();
+  gpu::SyncToken sync_token;
+  gl->GenSyncTokenCHROMIUM(fence_sync, sync_token.GetData());
+
+  resource.mailbox_holder =
+      gpu::MailboxHolder(mailbox, sync_token, GL_TEXTURE_2D);
+  resource.read_lock_fences_enabled = false;
+  resource.is_software = false;
+  resource.is_overlay_candidate = false;
+  mus_frame.delegated_frame_data->resource_list.push_back(std::move(resource));
+
+  const bool needs_blending = true;
+  const bool premultiplied_alpha = true;
+  const gfx::PointF uv_top_left(0.f, 0.f);
+  const gfx::PointF uv_bottom_right(1.f, 1.f);
+  const float vertex_opacity[4] = {1.f, 1.f, 1.f, 1.f};
+  const bool y_flipped = true;
+  const bool nearest_neighbor = false;
+
+  cc::TextureDrawQuad* quad =
+      pass->CreateAndAppendDrawQuad<cc::TextureDrawQuad>();
+  const uint32_t transparent_color = 0x00000000;
+  quad->SetAll(sqs, rect, rect, rect, needs_blending, resource.id, gfx::Size(),
+               premultiplied_alpha, uv_top_left, uv_bottom_right,
+               transparent_color, vertex_opacity, y_flipped, nearest_neighbor,
+               false);
+
+  mus_frame.delegated_frame_data->render_pass_list.push_back(std::move(pass));
+  mus_window_surface_->SubmitCompositorFrame(
+      std::move(mus_frame),
+      base::Bind(&MusBrowserCompositorOutputSurface::OnGpuSwapBuffersCompleted,
+                 base::Unretained(this), std::vector<ui::LatencyInfo>(),
+                 gfx::SwapResult::SWAP_ACK, nullptr));
+  return;
+}
+
+bool MusBrowserCompositorOutputSurface::BindToClient(
+    cc::OutputSurfaceClient* client) {
+  if (!GpuBrowserCompositorOutputSurface::BindToClient(client))
+    return false;
+  mus_window_surface_->BindToThread();
+  mus_window_surface_->set_client(this);
+  return true;
+}
+
+void MusBrowserCompositorOutputSurface::OnResourcesReturned(
+    mus::WindowSurface* surface,
+    mojo::Array<cc::ReturnedResource> resources) {
+  for (size_t i = 0; i < resources.size(); ++i) {
+    cc::ReturnedResource resource = std::move(resources[i]);
+    DCHECK_EQ(1, resource.count);
+    const gpu::Mailbox& mailbox = GetMailboxFromResourceId(resource.id);
+    GetCommandBufferProxy()->ReturnFrontBuffer(mailbox, resource.sync_token,
+                                               resource.lost);
+    FreeResourceId(resource.id);
+  }
+}
+
+uint32_t MusBrowserCompositorOutputSurface::AllocateResourceId() {
+  if (!free_resource_ids_.empty()) {
+    uint32_t id = free_resource_ids_.back();
+    free_resource_ids_.pop_back();
+    return id;
+  }
+  // Generate a new mailbox.
+  uint32_t id = mailboxs_.size();
+  mailboxs_.push_back(gpu::Mailbox::Generate());
+  return id;
+}
+
+void MusBrowserCompositorOutputSurface::FreeResourceId(uint32_t id) {
+  DCHECK_LT(id, mailboxs_.size());
+  DCHECK(std::find(free_resource_ids_.begin(), free_resource_ids_.end(), id) ==
+         free_resource_ids_.end());
+  free_resource_ids_.push_back(id);
+}
+
+const gpu::Mailbox& MusBrowserCompositorOutputSurface::GetMailboxFromResourceId(
+    uint32_t id) {
+  DCHECK_LT(id, mailboxs_.size());
+  DCHECK(std::find(free_resource_ids_.begin(), free_resource_ids_.end(), id) ==
+         free_resource_ids_.end());
+  return mailboxs_[id];
+}
+
+}  // namespace content