cmd_buffer_helper.cc revision f2477e01787aa58f445919b809d89e252beef54f
15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// This file contains the implementation of the command buffer helper class. 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include "gpu/command_buffer/client/cmd_buffer_helper.h" 8f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 9f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)#include "base/logging.h" 1090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include "gpu/command_buffer/common/command_buffer.h" 1190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include "gpu/command_buffer/common/trace_event.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace gpu { 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)const int kCommandsPerFlushCheck = 100; 168bcbed890bc3ce4d7a057a8f32cab53fa534672eTorne (Richard Coles) 178bcbed890bc3ce4d7a057a8f32cab53fa534672eTorne (Richard Coles)#if !defined(OS_ANDROID) 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)const double kFlushDelay = 1.0 / (5.0 * 60.0); 198bcbed890bc3ce4d7a057a8f32cab53fa534672eTorne (Richard Coles)#endif 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)CommandBufferHelper::CommandBufferHelper(CommandBuffer* command_buffer) 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : command_buffer_(command_buffer), 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ring_buffer_id_(-1), 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ring_buffer_size_(0), 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) entries_(NULL), 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) total_entry_count_(0), 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) token_(0), 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) put_(0), 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) last_put_sent_(0), 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) commands_issued_(0), 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) usable_(true), 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) context_lost_(false), 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) flush_automatically_(true), 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) last_flush_time_(0) { 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void CommandBufferHelper::SetAutomaticFlushes(bool enabled) { 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) flush_automatically_ = enabled; 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool CommandBufferHelper::IsContextLost() { 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!context_lost_) { 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) context_lost_ = error::IsError(command_buffer()->GetLastError()); 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return context_lost_; 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool CommandBufferHelper::AllocateRingBuffer() { 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!usable()) { 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (HaveRingBuffer()) { 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 572a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) int32 id = -1; 582a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) Buffer buffer = command_buffer_->CreateTransferBuffer(ring_buffer_size_, &id); 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (id < 0) { 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ClearUsable(); 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 642a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) ring_buffer_ = buffer; 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ring_buffer_id_ = id; 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) command_buffer_->SetGetBuffer(id); 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(gman): Do we really need to call GetState here? We know get & put = 0 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Also do we need to check state.num_entries? 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CommandBuffer::State state = command_buffer_->GetState(); 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) entries_ = static_cast<CommandBufferEntry*>(ring_buffer_.ptr); 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int32 num_ring_buffer_entries = 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ring_buffer_size_ / sizeof(CommandBufferEntry); 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (num_ring_buffer_entries > state.num_entries) { 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ClearUsable(); 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) total_entry_count_ = num_ring_buffer_entries; 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) put_ = state.put_offset; 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void CommandBufferHelper::FreeResources() { 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (HaveRingBuffer()) { 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) command_buffer_->DestroyTransferBuffer(ring_buffer_id_); 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ring_buffer_id_ = -1; 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void CommandBufferHelper::FreeRingBuffer() { 92f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) CHECK((put_ == get_offset()) || 932a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) error::IsError(command_buffer_->GetLastState().error)); 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FreeResources(); 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool CommandBufferHelper::Initialize(int32 ring_buffer_size) { 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ring_buffer_size_ = ring_buffer_size; 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return AllocateRingBuffer(); 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)CommandBufferHelper::~CommandBufferHelper() { 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FreeResources(); 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool CommandBufferHelper::FlushSync() { 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!usable()) { 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) last_flush_time_ = clock(); 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) last_put_sent_ = put_; 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CommandBuffer::State state = command_buffer_->FlushSync(put_, get_offset()); 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return state.error == error::kNoError; 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void CommandBufferHelper::Flush() { 1172a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (usable() && last_put_sent_ != put_) { 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) last_flush_time_ = clock(); 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) last_put_sent_ = put_; 1205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) command_buffer_->Flush(put_); 1215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Calls Flush() and then waits until the buffer is empty. Break early if the 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// error is set. 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool CommandBufferHelper::Finish() { 1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) TRACE_EVENT0("gpu", "CommandBufferHelper::Finish"); 1285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!usable()) { 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If there is no work just exit. 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (put_ == get_offset()) { 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 135f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) DCHECK(HaveRingBuffer()); 1365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) do { 1375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Do not loop forever if the flush fails, meaning the command buffer reader 1385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // has shutdown. 1395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!FlushSync()) 1405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 1415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } while (put_ != get_offset()); 1425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 1445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Inserts a new token into the command stream. It uses an increasing value 1475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// scheme so that we don't lose tokens (a token has passed if the current token 1485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// value is higher than that token). Calls Finish() if the token value wraps, 1495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// which will be rare. 1505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int32 CommandBufferHelper::InsertToken() { 1515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AllocateRingBuffer(); 1525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!usable()) { 1535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return token_; 1545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 155f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) DCHECK(HaveRingBuffer()); 1565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Increment token as 31-bit integer. Negative values are used to signal an 1575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // error. 1585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) token_ = (token_ + 1) & 0x7FFFFFFF; 1595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) cmd::SetToken* cmd = GetCmdSpace<cmd::SetToken>(); 1605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (cmd) { 1615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) cmd->Init(token_); 1625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (token_ == 0) { 1635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) TRACE_EVENT0("gpu", "CommandBufferHelper::InsertToken(wrapped)"); 1645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // we wrapped 1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Finish(); 166f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) DCHECK_EQ(token_, last_token_read()); 1675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return token_; 1705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Waits until the current token value is greater or equal to the value passed 1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// in argument. 1745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void CommandBufferHelper::WaitForToken(int32 token) { 1752a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (!usable() || !HaveRingBuffer()) { 1765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 1775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Return immediately if corresponding InsertToken failed. 1795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (token < 0) 1805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 1815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (token > token_) return; // we wrapped 1825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (last_token_read() < token) { 1835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (get_offset() == put_) { 184f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) LOG(FATAL) << "Empty command buffer while waiting on a token."; 1855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 1865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Do not loop forever if the flush fails, meaning the command buffer reader 1885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // has shutdown. 1895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!FlushSync()) 1905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 1915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Waits for available entries, basically waiting until get >= put + count + 1. 1955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// It actually waits for contiguous entries, so it may need to wrap the buffer 1962a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// around, adding a noops. Thus this function may change the value of put_. The 1975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// function will return early if an error occurs, in which case the available 1985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// space may not be available. 1995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void CommandBufferHelper::WaitForAvailableEntries(int32 count) { 2005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AllocateRingBuffer(); 2015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!usable()) { 2025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 2035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 204f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) DCHECK(HaveRingBuffer()); 205f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) DCHECK(count < total_entry_count_); 2062a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (put_ + count > total_entry_count_) { 2075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // There's not enough room between the current put and the end of the 2082a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // buffer, so we need to wrap. We will add noops all the way to the end, 2092a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // but we need to make sure get wraps first, actually that get is 1 or 2102a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // more (since put will wrap to 0 after we add the noops). 211f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) DCHECK_LE(1, put_); 2125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (get_offset() > put_ || get_offset() == 0) { 2135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) TRACE_EVENT0("gpu", "CommandBufferHelper::WaitForAvailableEntries"); 2145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (get_offset() > put_ || get_offset() == 0) { 2155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Do not loop forever if the flush fails, meaning the command buffer 2165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // reader has shutdown. 2175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!FlushSync()) 2185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 2195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2212a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Insert Noops to fill out the buffer. 2222a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) int32 num_entries = total_entry_count_ - put_; 2232a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) while (num_entries > 0) { 2242a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) int32 num_to_skip = std::min(CommandHeader::kMaxSize, num_entries); 2252a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) cmd::Noop::Set(&entries_[put_], num_to_skip); 2262a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) put_ += num_to_skip; 2272a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) num_entries -= num_to_skip; 2282a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 2295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) put_ = 0; 2305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (AvailableEntries() < count) { 2325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) TRACE_EVENT0("gpu", "CommandBufferHelper::WaitForAvailableEntries1"); 2335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (AvailableEntries() < count) { 2345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Do not loop forever if the flush fails, meaning the command buffer 2355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // reader has shutdown. 2365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!FlushSync()) 2375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 2385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Force a flush if the buffer is getting half full, or even earlier if the 2415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // reader is known to be idle. 2425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int32 pending = 2432a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) (put_ + total_entry_count_ - last_put_sent_) % total_entry_count_; 2442a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) int32 limit = total_entry_count_ / 2455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ((get_offset() == last_put_sent_) ? 16 : 2); 2465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (pending > limit) { 2475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Flush(); 2485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else if (flush_automatically_ && 2495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (commands_issued_ % kCommandsPerFlushCheck == 0)) { 2505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if !defined(OS_ANDROID) 2515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Allow this command buffer to be pre-empted by another if a "reasonable" 2525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // amount of work has been done. On highend machines, this reduces the 2535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // latency of GPU commands. However, on Android, this can cause the 2545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // kernel to thrash between generating GPU commands and executing them. 2555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) clock_t current_time = clock(); 2565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (current_time - last_flush_time_ > kFlushDelay * CLOCKS_PER_SEC) 2575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Flush(); 2585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 2595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)CommandBufferEntry* CommandBufferHelper::GetSpace(uint32 entries) { 2635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AllocateRingBuffer(); 2645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!usable()) { 2655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 2665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 267f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) DCHECK(HaveRingBuffer()); 2685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ++commands_issued_; 2695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WaitForAvailableEntries(entries); 2705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CommandBufferEntry* space = &entries_[put_]; 2715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) put_ += entries; 272f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) DCHECK_LE(put_, total_entry_count_); 2732a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (put_ == total_entry_count_) { 2745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) put_ = 0; 2755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return space; 2775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace gpu 280