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// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <array>
#include <memory>
#include <span>
#include <glad/glad.h>
#include "common/alignment.h"
#include "common/assert.h"
#include "common/bit_util.h"
#include "common/microprofile.h"
#include "video_core/renderer_opengl/gl_staging_buffer_pool.h"
MICROPROFILE_DEFINE(OpenGL_BufferRequest, "OpenGL", "BufferRequest", MP_RGB(128, 128, 192));
namespace OpenGL {
StagingBufferMap::~StagingBufferMap() {
if (sync) {
sync->Create();
}
}
StagingBuffers::StagingBuffers(GLenum storage_flags_, GLenum map_flags_)
: storage_flags{storage_flags_}, map_flags{map_flags_} {}
StagingBuffers::~StagingBuffers() = default;
StagingBufferMap StagingBuffers::RequestMap(size_t requested_size, bool insert_fence) {
MICROPROFILE_SCOPE(OpenGL_BufferRequest);
const size_t index = RequestBuffer(requested_size);
OGLSync* const sync = insert_fence ? &syncs[index] : nullptr;
sync_indices[index] = insert_fence ? ++current_sync_index : 0;
return StagingBufferMap{
.mapped_span = std::span(maps[index], requested_size),
.sync = sync,
.buffer = buffers[index].handle,
};
}
size_t StagingBuffers::RequestBuffer(size_t requested_size) {
if (const std::optional<size_t> index = FindBuffer(requested_size); index) {
return *index;
}
OGLBuffer& buffer = buffers.emplace_back();
buffer.Create();
const auto next_pow2_size = Common::NextPow2(requested_size);
glNamedBufferStorage(buffer.handle, next_pow2_size, nullptr,
storage_flags | GL_MAP_PERSISTENT_BIT);
maps.push_back(static_cast<u8*>(glMapNamedBufferRange(buffer.handle, 0, next_pow2_size,
map_flags | GL_MAP_PERSISTENT_BIT)));
syncs.emplace_back();
sync_indices.emplace_back();
sizes.push_back(next_pow2_size);
ASSERT(syncs.size() == buffers.size() && buffers.size() == maps.size() &&
maps.size() == sizes.size());
return buffers.size() - 1;
}
std::optional<size_t> StagingBuffers::FindBuffer(size_t requested_size) {
size_t known_unsignaled_index = current_sync_index + 1;
size_t smallest_buffer = std::numeric_limits<size_t>::max();
std::optional<size_t> found;
const size_t num_buffers = sizes.size();
for (size_t index = 0; index < num_buffers; ++index) {
const size_t buffer_size = sizes[index];
if (buffer_size < requested_size || buffer_size >= smallest_buffer) {
continue;
}
if (syncs[index].handle != 0) {
if (sync_indices[index] >= known_unsignaled_index) {
// This fence is later than a fence that is known to not be signaled
continue;
}
if (!syncs[index].IsSignaled()) {
// Since this fence hasn't been signaled, it's safe to assume all later
// fences haven't been signaled either
known_unsignaled_index = std::min(known_unsignaled_index, sync_indices[index]);
continue;
}
syncs[index].Release();
}
smallest_buffer = buffer_size;
found = index;
}
return found;
}
StreamBuffer::StreamBuffer() {
static constexpr GLenum flags = GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT | GL_MAP_COHERENT_BIT;
buffer.Create();
glObjectLabel(GL_BUFFER, buffer.handle, -1, "Stream Buffer");
glNamedBufferStorage(buffer.handle, STREAM_BUFFER_SIZE, nullptr, flags);
mapped_pointer =
static_cast<u8*>(glMapNamedBufferRange(buffer.handle, 0, STREAM_BUFFER_SIZE, flags));
for (OGLSync& sync : fences) {
sync.Create();
}
}
std::pair<std::span<u8>, size_t> StreamBuffer::Request(size_t size) noexcept {
ASSERT(size < REGION_SIZE);
for (size_t region = Region(used_iterator), region_end = Region(iterator); region < region_end;
++region) {
fences[region].Create();
}
used_iterator = iterator;
for (size_t region = Region(free_iterator) + 1,
region_end = std::min(Region(iterator + size) + 1, NUM_SYNCS);
region < region_end; ++region) {
glClientWaitSync(fences[region].handle, 0, GL_TIMEOUT_IGNORED);
fences[region].Release();
}
if (iterator + size >= free_iterator) {
free_iterator = iterator + size;
}
if (iterator + size > STREAM_BUFFER_SIZE) {
for (size_t region = Region(used_iterator); region < NUM_SYNCS; ++region) {
fences[region].Create();
}
used_iterator = 0;
iterator = 0;
free_iterator = size;
for (size_t region = 0, region_end = Region(size); region <= region_end; ++region) {
glClientWaitSync(fences[region].handle, 0, GL_TIMEOUT_IGNORED);
fences[region].Release();
}
}
const size_t offset = iterator;
iterator = Common::AlignUp(iterator + size, MAX_ALIGNMENT);
return {std::span(mapped_pointer + offset, size), offset};
}
StagingBufferMap StagingBufferPool::RequestUploadBuffer(size_t size) {
return upload_buffers.RequestMap(size, true);
}
StagingBufferMap StagingBufferPool::RequestDownloadBuffer(size_t size) {
return download_buffers.RequestMap(size, false);
}
} // namespace OpenGL
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