Rework FlushSync to return early if commands have been processed since the last update

gpu/pgl/command_buffer_pepper.cc

-// Copyright (c) 2011 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/pgl/command_buffer_pepper.h"
-
-#include "gpu/command_buffer/common/logging.h"
-
-using base::SharedMemory;
-using gpu::Buffer;
-using gpu::CommandBuffer;
-
-CommandBufferPepper::CommandBufferPepper(NPP npp,
-                                         NPDevice* device,
-                                         NPDeviceContext3D* context)
-    : npp_(npp),
-      device_(device),
-      context_(context) {
-}
-
-CommandBufferPepper::~CommandBufferPepper() {
-}
-
-// Not implemented in CommandBufferPepper.
-bool CommandBufferPepper::Initialize(int32 size) {
-  GPU_NOTREACHED();
-  return false;
-}
-
-bool CommandBufferPepper::Initialize(base::SharedMemory* buffer, int32 size) {
-  GPU_NOTREACHED();
-  return false;
-}
-
-Buffer CommandBufferPepper::GetRingBuffer() {
-  Buffer buffer;
-#if defined(ENABLE_NEW_NPDEVICE_API)
-  NPDeviceBuffer np_buffer;
-  device_->mapBuffer(npp_,
-                     context_,
-                     NP3DCommandBufferId,
-                     &np_buffer);
-  buffer.ptr = np_buffer.ptr;
-  buffer.size = np_buffer.size;
-#else
-  buffer.ptr = context_->commandBuffer;
-  buffer.size = context_->commandBufferSize * sizeof(int32);
-#endif
-  return buffer;
-}
-
-CommandBuffer::State CommandBufferPepper::GetState() {
-#if defined(ENABLE_NEW_NPDEVICE_API)
-  int32 output_attribs[] = {
-    NP3DAttrib_CommandBufferSize, 0,
-    NP3DAttrib_GetOffset, 0,
-    NP3DAttrib_PutOffset, 0,
-    NP3DAttrib_Token, 0,
-    NPAttrib_Error, 0,
-    NPAttrib_End
-  };
-  device_->synchronizeContext(npp_,
-                              context_,
-                              NPDeviceSynchronizationMode_Immediate,
-                              NULL,
-                              output_attribs,
-                              NULL,
-                              NULL);
-
-  CommandBuffer::State state;
-  state.num_entries = output_attribs[1];
-  state.get_offset = output_attribs[3];
-  state.put_offset = output_attribs[5];
-  state.token = output_attribs[7];
-  state.error = static_cast<gpu::error::Error>(
-      output_attribs[9]);
-
-  return state;
-#else
-  context_->waitForProgress = false;
-
-  if (NPERR_NO_ERROR != device_->flushContext(npp_, context_, NULL, NULL))
-    context_->error = NPDeviceContext3DError_GenericError;
-
-  context_->waitForProgress = true;
-
-  return ConvertState();
-#endif  // ENABLE_NEW_NPDEVICE_API
-}
-
-void CommandBufferPepper::Flush(int32 put_offset) {
-  FlushSync(put_offset);
-}
-
-CommandBuffer::State CommandBufferPepper::FlushSync(int32 put_offset) {
-#if defined(ENABLE_NEW_NPDEVICE_API)
-  int32 input_attribs[] = {
-    NP3DAttrib_PutOffset, put_offset,
-    NPAttrib_End
-  };
-  int32 output_attribs[] = {
-    NP3DAttrib_CommandBufferSize, 0,
-    NP3DAttrib_GetOffset, 0,
-    NP3DAttrib_PutOffset, 0,
-    NP3DAttrib_Token, 0,
-    NPAttrib_Error, 0,
-    NPAttrib_End
-  };
-  device_->synchronizeContext(npp_,
-                              context_,
-                              NPDeviceSynchronizationMode_Flush,
-                              input_attribs,
-                              output_attribs,
-                              NULL,
-                              NULL);
-
-  CommandBuffer::State state;
-  state.num_entries = output_attribs[1];
-  state.get_offset = output_attribs[3];
-  state.put_offset = output_attribs[5];
-  state.token = output_attribs[7];
-  state.error = static_cast<gpu::error::Error>(
-      output_attribs[9]);
-
-  return state;
-#else
-  context_->waitForProgress = true;
-  context_->putOffset = put_offset;
-
-  if (NPERR_NO_ERROR != device_->flushContext(npp_, context_, NULL, NULL))
-    context_->error = NPDeviceContext3DError_GenericError;
-
-  return ConvertState();
-#endif  // ENABLE_NEW_NPDEVICE_API
-}
-
-void CommandBufferPepper::SetGetOffset(int32 get_offset) {
-  // Not implemented by proxy.
-  GPU_NOTREACHED();
-}
-
-int32 CommandBufferPepper::CreateTransferBuffer(size_t size, int32 id_request) {
-  int32_t id;
-  if (NPERR_NO_ERROR != device_->createBuffer(npp_, context_, size, &id))
-    return -1;
-
-  return static_cast<int32>(id);
-}
-
-int32 CommandBufferPepper::RegisterTransferBuffer(
-    base::SharedMemory* shared_memory,
-    size_t size,
-    int32 id_request) {
-  // Not implemented by proxy.
-  GPU_NOTREACHED();
-  return -1;
-}
-
-void CommandBufferPepper::DestroyTransferBuffer(int32 id) {
-  device_->destroyBuffer(npp_, context_, id);
-}
-
-Buffer CommandBufferPepper::GetTransferBuffer(int32 id) {
-  NPDeviceBuffer np_buffer;
-  if (NPERR_NO_ERROR != device_->mapBuffer(npp_, context_, id, &np_buffer))
-    return Buffer();
-
-  Buffer buffer;
-  buffer.ptr = np_buffer.ptr;
-  buffer.size = np_buffer.size;
-  return buffer;
-}
-
-void CommandBufferPepper::SetToken(int32 token) {
-  // Not implemented by proxy.
-  GPU_NOTREACHED();
-}
-
-void CommandBufferPepper::SetParseError(
-    gpu::error::Error error) {
-  // Not implemented by proxy.
-  GPU_NOTREACHED();
-}
-
-gpu::error::Error CommandBufferPepper::GetCachedError() {
-  int32_t attrib_list[] = {
-    NPAttrib_Error, 0,
-    NPAttrib_End
-  };
-  device_->synchronizeContext(npp_,
-                              context_,
-                              NPDeviceSynchronizationMode_Cached,
-                              NULL,
-                              attrib_list,
-                              NULL,
-                              NULL);
-  return static_cast<gpu::error::Error>(attrib_list[1]);
-}
-
-CommandBuffer::State CommandBufferPepper::ConvertState() {
-  CommandBuffer::State state;
-  state.num_entries = context_->commandBufferSize;
-  state.get_offset = context_->getOffset;
-  state.put_offset = context_->putOffset;
-  state.token = context_->token;
-  state.error = static_cast<gpu::error::Error>(
-      context_->error);
-  return state;
-}