blob: bef14c3b4c79da588a2196b51f4ea8fc170c9e7f [file] [log] [blame]
// Copyright 2016 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.
#ifndef GPU_COMMAND_BUFFER_CLIENT_SHARED_MEMORY_LIMITS_H_
#define GPU_COMMAND_BUFFER_CLIENT_SHARED_MEMORY_LIMITS_H_
#include <stddef.h>
#include "base/system/sys_info.h"
#include "build/build_config.h"
#include "ui/gfx/geometry/size.h"
namespace gpu {
struct SharedMemoryLimits {
SharedMemoryLimits() {
// We can't call AmountOfPhysicalMemory under NACL, so leave the default.
#if !defined(OS_NACL)
// Max mapped memory to use for a texture upload depends on device ram.
// Do not use more than 5% of extra shared memory, and do not use any extra
// for memory contrained devices (<=1GB).
max_mapped_memory_for_texture_upload =
base::SysInfo::AmountOfPhysicalMemory() > 1024 * 1024 * 1024
? base::saturated_cast<uint32_t>(
base::SysInfo::AmountOfPhysicalMemory() / 20)
: 0;
// On memory constrained devices, switch to lower limits.
if (base::SysInfo::AmountOfPhysicalMemoryMB() <= 512) {
command_buffer_size = 512 * 1024;
start_transfer_buffer_size = 32 * 1024;
min_transfer_buffer_size = 32 * 1024;
mapped_memory_chunk_size = 256 * 1024;
}
#endif
}
uint32_t command_buffer_size = 1024 * 1024;
uint32_t start_transfer_buffer_size = 64 * 1024;
uint32_t min_transfer_buffer_size = 64 * 1024;
uint32_t max_transfer_buffer_size = 16 * 1024 * 1024;
static constexpr uint32_t kNoLimit = 0;
uint32_t mapped_memory_reclaim_limit = kNoLimit;
uint32_t mapped_memory_chunk_size = 2 * 1024 * 1024;
uint32_t max_mapped_memory_for_texture_upload = 0;
// These are limits for contexts only used for creating textures, mailboxing
// them and dealing with synchronization.
static SharedMemoryLimits ForMailboxContext() {
SharedMemoryLimits limits;
limits.command_buffer_size = 64 * 1024;
limits.start_transfer_buffer_size = 64 * 1024;
limits.min_transfer_buffer_size = 64 * 1024;
return limits;
}
static SharedMemoryLimits ForOOPRasterContext() {
SharedMemoryLimits limits;
limits.command_buffer_size = 64 * 1024;
// TODO(khushalsagar): See if transfer buffer sizes can be fine-tuned
// further. A 16M max_transfer_buffer_size doesn't make sense if only paint
// commands are being sent through this buffer, and all large transfers use
// the transfer cache backed by mapped memory.
return limits;
}
#if defined(OS_ANDROID)
static SharedMemoryLimits ForDisplayCompositor(const gfx::Size& screen_size) {
DCHECK(!screen_size.IsEmpty());
SharedMemoryLimits limits;
constexpr size_t kBytesPerPixel = 4;
const size_t full_screen_texture_size_in_bytes =
screen_size.width() * screen_size.height() * kBytesPerPixel;
// Android uses a smaller command buffer for the display compositor. Meant
// to hold the contents of the display compositor drawing the scene. See
// discussion here: https://goo.gl/s23m5j
limits.command_buffer_size = 64 * 1024;
// These limits are meant to hold the uploads for the browser UI without
// any excess space.
limits.start_transfer_buffer_size = 64 * 1024;
limits.min_transfer_buffer_size = 64 * 1024;
limits.max_transfer_buffer_size = full_screen_texture_size_in_bytes;
// Texture uploads may use mapped memory so give a reasonable limit for
// them.
limits.mapped_memory_reclaim_limit = full_screen_texture_size_in_bytes;
return limits;
}
#else
static SharedMemoryLimits ForDisplayCompositor() {
return SharedMemoryLimits();
}
#endif
};
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_CLIENT_SHARED_MEMORY_LIMITS_H_