gpu: Implement idle async pixel transfers.

ui/gl/async_pixel_transfer_delegate_idle.cc

Index: ui/gl/async_pixel_transfer_delegate_idle.cc
diff --git a/ui/gl/async_pixel_transfer_delegate_idle.cc b/ui/gl/async_pixel_transfer_delegate_idle.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9c721e58092d2b3edb8a1624b6eba64271e6fb11
--- /dev/null
+++ b/ui/gl/async_pixel_transfer_delegate_idle.cc
@@ -0,0 +1,328 @@
+// Copyright (c) 2013 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 "ui/gl/async_pixel_transfer_delegate_idle.h"
+
+#include "base/bind.h"
+#include "base/debug/trace_event.h"
+#include "base/lazy_instance.h"
+#include "base/message_loop.h"
+#include "base/process_util.h"
+#include "base/shared_memory.h"
+#include "build/build_config.h"
+#include "ui/gl/gl_bindings.h"
+#include "ui/gl/gl_context.h"
+#include "ui/gl/gl_surface.h"
+#include "ui/gl/safe_shared_memory_pool.h"
+#include "ui/gl/scoped_make_current.h"
+
+using base::SharedMemory;
+using base::SharedMemoryHandle;
+
+namespace gfx {
+
+namespace {
+
+// Gets the address of the data from shared memory.
+void* GetAddress(SharedMemory* shared_memory, uint32 shm_data_offset) {
+  // Memory bounds have already been validated, so there
+  // are just DCHECKS here.
+  DCHECK(shared_memory);
+  DCHECK(shared_memory->memory());
+  return static_cast<int8*>(shared_memory->memory()) + shm_data_offset;
+}
+
+base::LazyInstance<SafeSharedMemoryPool> g_safe_shared_memory_pool =
+    LAZY_INSTANCE_INITIALIZER;
+
+SafeSharedMemoryPool* safe_shared_memory_pool() {
+  return g_safe_shared_memory_pool.Pointer();
+}
+
+static uint64 g_next_pixel_transfer_state_id = 1;
+
+} // namespace
+
+#if !defined(OS_ANDROID)
+scoped_ptr<AsyncPixelTransferDelegate>
+    AsyncPixelTransferDelegate::Create(gfx::GLContext* context) {
+  return AsyncPixelTransferDelegateIdle::Create(context);
+}
+#endif
+
+scoped_ptr<AsyncPixelTransferDelegate>
+      AsyncPixelTransferDelegateIdle::Create(gfx::GLContext* context) {
+  return make_scoped_ptr(
+      static_cast<AsyncPixelTransferDelegate*>(
+          new AsyncPixelTransferDelegateIdle()));
+}
+
+class AsyncPixelTransferStateIdle : public AsyncPixelTransferState {
+ public:
+  typedef base::Callback<void(GLuint)> TransferCallback;
+
+  explicit AsyncPixelTransferStateIdle(GLuint texture_id)
+      : id_(g_next_pixel_transfer_state_id++),
+        texture_id_(texture_id),
+        transfer_in_progress_(false) {
+  }
+  virtual ~AsyncPixelTransferStateIdle() {}
+
+  // Overridden from gfx::AsyncPixelTransferState:
+  virtual bool TransferIsInProgress() OVERRIDE {
+    return transfer_in_progress_;
+  }
+
+  uint64 id() const { return id_; }
+
+  void set_transfer_in_progress(bool transfer_in_progress) {
+    transfer_in_progress_ = transfer_in_progress;
+  }
+
+  void PerformTransfer(const TransferCallback& callback) {
+    DCHECK(texture_id_);
+    DCHECK(transfer_in_progress_);
+    callback.Run(texture_id_);
+    transfer_in_progress_ = false;
+  }
+
+ private:
+  uint64 id_;
+  GLuint texture_id_;
+  bool transfer_in_progress_;
+};
+
+AsyncPixelTransferDelegateIdle::Transfer::Transfer(
+    uint64 id, const base::Closure& task)
+    : id(id),
+      task(task) {
+}
+
+AsyncPixelTransferDelegateIdle::Transfer::~Transfer() {}
+
+AsyncPixelTransferDelegateIdle::AsyncPixelTransferDelegateIdle()
+    : texture_upload_count_(0) {
+}
+
+AsyncPixelTransferDelegateIdle::~AsyncPixelTransferDelegateIdle() {
+}
+
+AsyncPixelTransferState*
+    AsyncPixelTransferDelegateIdle::CreateRawPixelTransferState(
+        GLuint texture_id,
+        const AsyncTexImage2DParams& define_params) {
+  return new AsyncPixelTransferStateIdle(texture_id);
+}
+
+bool AsyncPixelTransferDelegateIdle::BindCompletedAsyncTransfers() {
+  // Everything is already bound.
+  return false;
+}
+
+void AsyncPixelTransferDelegateIdle::AsyncNotifyCompletion(
+    const AsyncMemoryParams& mem_params,
+    const CompletionCallback& callback) {
+  if (transfers_.empty()) {
+    callback.Run(mem_params);
+    return;
+  }
+
+  transfers_.back().notifications.push(
+      base::Bind(
+          &AsyncPixelTransferDelegateIdle::PerformNotifyCompletion,
+          AsWeakPtr(),
+          mem_params,
+          base::Owned(new ScopedSafeSharedMemory(safe_shared_memory_pool(),
+                                                 mem_params.shared_memory,
+                                                 mem_params.shm_size)),
+          callback));
+}
+
+void AsyncPixelTransferDelegateIdle::AsyncTexImage2D(
+    AsyncPixelTransferState* transfer_state,
+    const AsyncTexImage2DParams& tex_params,
+    const AsyncMemoryParams& mem_params,
+    const base::Closure& bind_callback) {
+  AsyncPixelTransferStateIdle* state =
+      static_cast<AsyncPixelTransferStateIdle*>(transfer_state);
+  DCHECK_EQ(static_cast<GLenum>(GL_TEXTURE_2D), tex_params.target);
+  DCHECK(mem_params.shared_memory);
+  DCHECK_LE(mem_params.shm_data_offset + mem_params.shm_data_size,
+            mem_params.shm_size);
+  DCHECK(state);
+
+  transfers_.push_back(
+      Transfer(
+          state->id(),
+          base::Bind(
+              &AsyncPixelTransferStateIdle::PerformTransfer,
+              base::AsWeakPtr(state),
+              base::Bind(
+                  &AsyncPixelTransferDelegateIdle::PerformAsyncTexImage2D,
+                  AsWeakPtr(),
+                  tex_params,
+                  mem_params,
+                  bind_callback,
+                  base::Owned(new ScopedSafeSharedMemory(
+                                  safe_shared_memory_pool(),
+                                  mem_params.shared_memory,
+                                  mem_params.shm_size))))));
+
+  state->set_transfer_in_progress(true);
+}
+
+void AsyncPixelTransferDelegateIdle::AsyncTexSubImage2D(
+    AsyncPixelTransferState* transfer_state,
+    const AsyncTexSubImage2DParams& tex_params,
+    const AsyncMemoryParams& mem_params) {
+  AsyncPixelTransferStateIdle* state =
+      static_cast<AsyncPixelTransferStateIdle*>(transfer_state);
+  DCHECK_EQ(static_cast<GLenum>(GL_TEXTURE_2D), tex_params.target);
+  DCHECK(mem_params.shared_memory);
+  DCHECK_LE(mem_params.shm_data_offset + mem_params.shm_data_size,
+            mem_params.shm_size);
+  DCHECK(state);
+
+  transfers_.push_back(
+      Transfer(
+          state->id(),
+          base::Bind(
+              &AsyncPixelTransferStateIdle::PerformTransfer,
+              base::AsWeakPtr(state),
+              base::Bind(
+                  &AsyncPixelTransferDelegateIdle::PerformAsyncTexSubImage2D,
+                  AsWeakPtr(),
+                  tex_params,
+                  mem_params,
+                  base::Owned(new ScopedSafeSharedMemory(
+                                  safe_shared_memory_pool(),
+                                  mem_params.shared_memory,
+                                  mem_params.shm_size))))));
+
+  state->set_transfer_in_progress(true);
+}
+
+void AsyncPixelTransferDelegateIdle::WaitForTransferCompletion(
+    AsyncPixelTransferState* transfer_state) {
+  AsyncPixelTransferStateIdle* state =
+      static_cast<AsyncPixelTransferStateIdle*>(transfer_state);
+  DCHECK(state);
+
+  for (std::list<Transfer>::iterator iter = transfers_.begin();
+       iter != transfers_.end(); ++iter) {
+    if (iter->id != state->id())
+      continue;
+
+    ProcessTransfer(*iter);
+    transfers_.erase(iter);
+    break;
+  }
+}
+
+uint32 AsyncPixelTransferDelegateIdle::GetTextureUploadCount() {
+  return texture_upload_count_;
+}
+
+base::TimeDelta AsyncPixelTransferDelegateIdle::GetTotalTextureUploadTime() {
+  return total_texture_upload_time_;
+}
+
+bool AsyncPixelTransferDelegateIdle::ProcessMorePendingTransfers() {
+  if (transfers_.empty())
+    return false;
+
+  ProcessTransfer(transfers_.front());
+  transfers_.pop_front();
+  return true;
+}
+
+bool AsyncPixelTransferDelegateIdle::NeedsProcessMorePendingTransfers() {
+  return !transfers_.empty();
+}
+
+void AsyncPixelTransferDelegateIdle::ProcessTransfer(Transfer& transfer) {
+  transfer.task.Run();
+  while (!transfer.notifications.empty()) {
+    transfer.notifications.front().Run();
+    transfer.notifications.pop();
+  }
+}
+
+void AsyncPixelTransferDelegateIdle::PerformNotifyCompletion(
+    AsyncMemoryParams mem_params,
+    ScopedSafeSharedMemory* safe_shared_memory,
+    const CompletionCallback& callback) {
+  TRACE_EVENT0("gpu", "PerformNotifyCompletion");
+  gfx::AsyncMemoryParams safe_mem_params = mem_params;
+  safe_mem_params.shared_memory = safe_shared_memory->shared_memory();
+  callback.Run(safe_mem_params);
+}
+
+void AsyncPixelTransferDelegateIdle::PerformAsyncTexImage2D(
+    AsyncTexImage2DParams tex_params,
+    AsyncMemoryParams mem_params,
+    const base::Closure& bind_callback,
+    ScopedSafeSharedMemory* safe_shared_memory,
+    GLuint texture_id) {
+  TRACE_EVENT2("gpu", "PerformAsyncTexImage2D",
+               "width", tex_params.width,
+               "height", tex_params.height);
+
+  void* data = GetAddress(safe_shared_memory->shared_memory(),
+                          mem_params.shm_data_offset);
+
+  glBindTexture(tex_params.target, texture_id);
+
+  {
+    TRACE_EVENT0("gpu", "glTexImage2D");
+    glTexImage2D(
+        tex_params.target,
+        tex_params.level,
+        tex_params.internal_format,
+        tex_params.width,
+        tex_params.height,
+        tex_params.border,
+        tex_params.format,
+        tex_params.type,
+        data);
+  }
+
+  // The texture is already fully bound so just call it now.
+  bind_callback.Run();
+}
+
+void AsyncPixelTransferDelegateIdle::PerformAsyncTexSubImage2D(
+    AsyncTexSubImage2DParams tex_params,
+    AsyncMemoryParams mem_params,
+    ScopedSafeSharedMemory* safe_shared_memory,
+    GLuint texture_id) {
+  TRACE_EVENT2("gpu", "PerformAsyncTexSubImage2D",
+               "width", tex_params.width,
+               "height", tex_params.height);
+
+  void* data = GetAddress(safe_shared_memory->shared_memory(),
+                          mem_params.shm_data_offset);
+
+  base::TimeTicks begin_time(base::TimeTicks::HighResNow());
+  glBindTexture(tex_params.target, texture_id);
+
+  {
+    TRACE_EVENT0("gpu", "glTexSubImage2D");
+    glTexSubImage2D(
+        tex_params.target,
+        tex_params.level,
+        tex_params.xoffset,
+        tex_params.yoffset,
+        tex_params.width,
+        tex_params.height,
+        tex_params.format,
+        tex_params.type,
+        data);
+  }
+
+  texture_upload_count_++;
+  total_texture_upload_time_ += base::TimeTicks::HighResNow() - begin_time;
+}
+
+}  // namespace gfx