components: Add Exosphere component.

components/exo/buffer.cc

+// Copyright 2015 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 "components/exo/buffer.h"
+
+#include <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+#include <GLES2/gl2extchromium.h>
+
+#include <algorithm>
+
+#include "base/logging.h"
+#include "base/trace_event/trace_event.h"
+#include "base/trace_event/trace_event_argument.h"
+#include "cc/output/context_provider.h"
+#include "cc/resources/single_release_callback.h"
+#include "cc/resources/texture_mailbox.h"
+#include "gpu/command_buffer/client/gles2_interface.h"
+#include "gpu/command_buffer/common/mailbox.h"
+#include "ui/aura/env.h"
+#include "ui/compositor/compositor.h"
+#include "ui/gfx/gpu_memory_buffer.h"
+
+namespace exo {
+namespace {
+
+GLenum GLInternalFormat(gfx::BufferFormat format) {
+  const GLenum kGLInternalFormats[] = {
+      GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD,  // ATC
+      GL_COMPRESSED_RGB_S3TC_DXT1_EXT,     // ATCIA
+      GL_COMPRESSED_RGB_S3TC_DXT1_EXT,     // DXT1
+      GL_COMPRESSED_RGBA_S3TC_DXT5_EXT,    // DXT5
+      GL_ETC1_RGB8_OES,                    // ETC1
+      GL_R8_EXT,                           // R_8
+      GL_RGBA,                             // RGBA_4444
+      GL_RGB,                              // RGBX_8888
+      GL_RGBA,                             // RGBA_8888
+      GL_RGB,                              // BGRX_8888
+      GL_BGRA_EXT,                         // BGRA_8888
+      GL_RGB_YUV_420_CHROMIUM,             // YUV_420
+      GL_INVALID_ENUM,                     // YUV_420_BIPLANAR
+      GL_RGB_YCBCR_422_CHROMIUM,           // UYVY_422
+  };
+  static_assert(arraysize(kGLInternalFormats) ==
+                    (static_cast<int>(gfx::BufferFormat::LAST) + 1),
+                "BufferFormat::LAST must be last value of kGLInternalFormats");
+
+  DCHECK(format <= gfx::BufferFormat::LAST);
+  return kGLInternalFormats[static_cast<int>(format)];
+}
+
+gpu::gles2::GLES2Interface* GetContextGL() {
+  ui::ContextFactory* context_factory =
+      aura::Env::GetInstance()->context_factory();
+  return context_factory->SharedMainThreadContextProvider()->ContextGL();
+}
+
+}  // namespace
+
+////////////////////////////////////////////////////////////////////////////////
+// Buffer, public:
+
+Buffer::Buffer(scoped_ptr<gfx::GpuMemoryBuffer> gpu_memory_buffer,
+               unsigned texture_target)
+    : gpu_memory_buffer_(gpu_memory_buffer.Pass()),
+      texture_target_(texture_target),
+      texture_id_(0),
+      image_id_(GetContextGL()->CreateImageCHROMIUM(
+          gpu_memory_buffer_->AsClientBuffer(),
+          gpu_memory_buffer_->GetSize().width(),
+          gpu_memory_buffer_->GetSize().height(),
+          GLInternalFormat(gpu_memory_buffer_->GetFormat()))),
+      weak_ptr_factory_(this) {}
+
+Buffer::~Buffer() {
+  gpu::gles2::GLES2Interface* gles2 = GetContextGL();
+  if (texture_id_)
+    gles2->DeleteTextures(1, &texture_id_);
+  if (image_id_)
+    gles2->DestroyImageCHROMIUM(image_id_);
+}
+
+scoped_ptr<cc::SingleReleaseCallback> Buffer::GetTextureMailbox(
+    cc::TextureMailbox* texture_mailbox) {
+  // Buffer can only be used by one client at a time. If there's no image,
+  // then a previous call to GetTextureMailbox() is using it and it has not
+  // been released yet.
+  if (!image_id_) {
+    DLOG(WARNING) << "Client tried to use a buffer that has not been released";
+    return nullptr;
+  }
+
+  // Take ownerhsip of image and texture ids.
+  unsigned texture_id = 0;
+  unsigned image_id = 0;
+  std::swap(texture_id, texture_id_);
+  std::swap(image_id, image_id_);
+
+  // Create a new texture if needed or bind existing one.
+  gpu::gles2::GLES2Interface* gles2 = GetContextGL();
+  gles2->ActiveTexture(GL_TEXTURE0);
+  if (!texture_id) {
+    gles2->GenTextures(1, &texture_id);
+    gles2->BindTexture(texture_target_, texture_id);
+    gles2->TexParameteri(texture_target_, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    gles2->TexParameteri(texture_target_, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    gles2->TexParameteri(texture_target_, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    gles2->TexParameteri(texture_target_, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+  } else {
+    gles2->BindTexture(texture_target_, texture_id);
+  }
+
+  // Bind the image to texture.
+  gles2->BindTexImage2DCHROMIUM(texture_target_, image_id);
+
+  // Create a mailbox for texture.
+  gpu::Mailbox mailbox;
+  gles2->GenMailboxCHROMIUM(mailbox.name);

[piman, 2015/11/17 02:43:53]

mailboxe names are not free to create (crypto-secure random), so, assuming
Buffer are reused, I'd suggest recycling them, e.g. keeping a list of "free"
mailbox names, that get filled in Buffer::Release.

[reveman, 2015/11/17 18:04:04]

Good point. Yes, buffers are meant to be reused. Buffer creation is considered
expensive while buffer reuse is considered cheap. A buffer can only be
associated with one surface at the time so I simply moved this to the ctor in
latest patch.

+  gles2->ProduceTextureCHROMIUM(texture_target_, mailbox.name);
+  uint64 fence_sync = gles2->InsertFenceSyncCHROMIUM();
+  gles2->OrderingBarrierCHROMIUM();
+  gpu::SyncToken sync_token;
+  gles2->GenUnverifiedSyncTokenCHROMIUM(fence_sync, sync_token.GetData());
+
+  bool is_overlay_candidate = false;
+  *texture_mailbox =
+      cc::TextureMailbox(mailbox, sync_token, texture_target_,
+                         gpu_memory_buffer_->GetSize(), is_overlay_candidate);
+  return cc::SingleReleaseCallback::Create(
+             base::Bind(&Buffer::Release, weak_ptr_factory_.GetWeakPtr(),
+                        texture_target_, texture_id, image_id))
+      .Pass();
+}
+
+scoped_refptr<base::trace_event::TracedValue> Buffer::AsTracedValue() const {
+  scoped_refptr<base::trace_event::TracedValue> value =
+      new base::trace_event::TracedValue;
+  value->SetInteger("width", size_.width());
+  value->SetInteger("height", size_.height());
+  value->SetInteger("format",
+                    static_cast<int>(gpu_memory_buffer_->GetFormat()));
+  return value;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Buffer, private:
+
+// static
+void Buffer::Release(base::WeakPtr<Buffer> buffer,
+                     unsigned texture_target,
+                     unsigned texture_id,
+                     unsigned image_id,
+                     const gpu::SyncToken& sync_token,
+                     bool is_lost) {
+  TRACE_EVENT1("exo", "Buffer::Release", "is_lost", is_lost);
+
+  gpu::gles2::GLES2Interface* gles2 = GetContextGL();
+  gles2->WaitSyncTokenCHROMIUM(sync_token.GetConstData());
+  gles2->ActiveTexture(GL_TEXTURE0);
+  gles2->BindTexture(texture_target, texture_id);
+  gles2->ReleaseTexImage2DCHROMIUM(texture_target, image_id);
+
+  // Delete resources and return if buffer is gone.
+  if (!buffer) {
+    gles2->DeleteTextures(1, &texture_id);
+    gles2->DestroyImageCHROMIUM(image_id);
+    return;
+  }
+
+  DCHECK_EQ(buffer->texture_id_, 0u);
+  buffer->texture_id_ = texture_id;
+  DCHECK_EQ(buffer->image_id_, 0u);
+  buffer->image_id_ = image_id;
+
+  if (!buffer->release_callback_.is_null())
+    buffer->release_callback_.Run();
+}
+
+}  // namespace exo