gpu: Add async pixel transfer interface, stub and tests.

gpu/command_buffer/service/texture_manager.cc

 // Copyright (c) 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 "gpu/command_buffer/service/texture_manager.h"
 #include "base/bits.h"
 #include "base/stringprintf.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
@@ skipping 1192 matching lines @@
 }
 
 void TextureManager::AddToSignature(
     TextureInfo* info,
     GLenum target,
     GLint level,
     std::string* signature) const {
   info->AddToSignature(feature_info_.get(), target, level, signature);
 }
 
+void TextureManager::AddPendingAsyncPixelTransfer(
+    base::WeakPtr<gfx::AsyncPixelTransferState> state, TextureInfo* info) {
+  pending_async_transfers_.push_back(PendingAsyncTransfer(state,info));
+}
+
+void TextureManager::BindFinishedAsyncPixelTransfers(
+    bool* texture_dirty, bool* framebuffer_dirty) {
+  DCHECK(texture_dirty);
+  DCHECK(framebuffer_dirty);
+  *texture_dirty = false;
+  *framebuffer_dirty = false;
+
+  // Remove finished transfers from the list, while
+  // marking whether the texture unit or frame_buffer is dirty.
+  for (PendingAsyncTransferList::iterator it = pending_async_transfers_.begin();
+      it != pending_async_transfers_.end(); ) {
+    // The AsyncState is owned by the TextureInfo. So if the
+    // async state is deleted, so is the TextureInfo.
+    if (!it->first.get()) {
+      pending_async_transfers_.erase(it++);

[greggman, 2012/12/15 06:45:04]

I still believe this needs to be

   it = pending_async_transfers_.erase(it);

so it will work regardless of container

[epenner, 2012/12/17 06:29:18]

I realized I could use front()/pop_front() in this case since it now never goes
past the first element.

+      continue;
+    }
+    // Terminate early, as transfers finish in order.
+    if (it->first->TransferIsInProgress())
+      break;
+    // If the transfer is finished, bind it to the texture,
+    // and update the TextureInfo.
+    *texture_dirty = true;
+    *framebuffer_dirty |= it->second->IsAttachedToFramebuffer();
+    gfx::AsyncTexImage2DParams tex_define_params;
+    it->second->GetAsyncTransferState()->BindTransfer(&tex_define_params);
+    SetLevelInfo(
+        it->second,
+        tex_define_params.target,
+        tex_define_params.level,
+        tex_define_params.internal_format,
+        tex_define_params.width,
+        tex_define_params.height,
+        1, // depth
+        tex_define_params.border,
+        tex_define_params.format,
+        tex_define_params.type,
+        true); // cleared
+    pending_async_transfers_.erase(it++);

[greggman, 2012/12/15 06:45:04]

I still believe this needs to be

   it = pending_async_transfers_.erase(it);

[epenner, 2012/12/17 06:29:18]

Ditto

+  }
+}
+
 }  // namespace gles2
 }  // namespace gpu