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// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <cstring>
#include <memory>
#include <utility>
#include "common/alignment.h"
#include "common/assert.h"
#include "core/core.h"
#include "video_core/memory_manager.h"
#include "video_core/renderer_opengl/gl_buffer_cache.h"
#include "video_core/renderer_opengl/gl_rasterizer.h"
#include "video_core/renderer_opengl/gl_resource_manager.h"
namespace OpenGL {
namespace {
constexpr GLuint EmptyBuffer = 0;
constexpr GLintptr CachedBufferOffset = 0;
OGLBuffer CreateBuffer(std::size_t size, GLenum usage) {
OGLBuffer buffer;
buffer.Create();
glNamedBufferData(buffer.handle, size, nullptr, usage);
return buffer;
}
} // Anonymous namespace
CachedBufferEntry::CachedBufferEntry(VAddr cpu_addr, u8* host_ptr)
: RasterizerCacheObject{host_ptr}, cpu_addr{cpu_addr} {}
OGLBufferCache::OGLBufferCache(RasterizerOpenGL& rasterizer, std::size_t size)
: RasterizerCache{rasterizer}, stream_buffer(size, true) {}
OGLBufferCache::~OGLBufferCache() = default;
void OGLBufferCache::Unregister(const std::shared_ptr<CachedBufferEntry>& entry) {
std::lock_guard lock{mutex};
if (entry->IsInternalized()) {
internalized_entries.erase(entry->GetCacheAddr());
}
ReserveBuffer(entry);
RasterizerCache<std::shared_ptr<CachedBufferEntry>>::Unregister(entry);
}
OGLBufferCache::BufferInfo OGLBufferCache::UploadMemory(GPUVAddr gpu_addr, std::size_t size,
std::size_t alignment, bool internalize) {
std::lock_guard lock{mutex};
auto& memory_manager = Core::System::GetInstance().GPU().MemoryManager();
const auto host_ptr{memory_manager.GetPointer(gpu_addr)};
const auto cache_addr{ToCacheAddr(host_ptr)};
if (!host_ptr) {
return {EmptyBuffer, 0};
}
// Cache management is a big overhead, so only cache entries with a given size.
// TODO: Figure out which size is the best for given games.
if (!internalize && size < 0x800 &&
internalized_entries.find(cache_addr) == internalized_entries.end()) {
return StreamBufferUpload(host_ptr, size, alignment);
}
auto entry = TryGet(host_ptr);
if (!entry) {
return FixedBufferUpload(gpu_addr, host_ptr, size, internalize);
}
if (entry->GetSize() < size) {
GrowBuffer(entry, size);
}
return {entry->GetBuffer(), CachedBufferOffset};
}
OGLBufferCache::BufferInfo OGLBufferCache::UploadHostMemory(const void* raw_pointer,
std::size_t size,
std::size_t alignment) {
return StreamBufferUpload(raw_pointer, size, alignment);
}
bool OGLBufferCache::Map(std::size_t max_size) {
const auto max_size_ = static_cast<GLsizeiptr>(max_size);
bool invalidate;
std::tie(buffer_ptr, buffer_offset_base, invalidate) = stream_buffer.Map(max_size_, 4);
buffer_offset = buffer_offset_base;
return invalidate;
}
void OGLBufferCache::Unmap() {
stream_buffer.Unmap(buffer_offset - buffer_offset_base);
}
OGLBufferCache::BufferInfo OGLBufferCache::StreamBufferUpload(const void* raw_pointer,
std::size_t size,
std::size_t alignment) {
AlignBuffer(alignment);
const GLintptr uploaded_offset = buffer_offset;
std::memcpy(buffer_ptr, raw_pointer, size);
buffer_ptr += size;
buffer_offset += size;
return {stream_buffer.GetHandle(), uploaded_offset};
}
OGLBufferCache::BufferInfo OGLBufferCache::FixedBufferUpload(GPUVAddr gpu_addr, u8* host_ptr,
std::size_t size, bool internalize) {
if (internalize) {
internalized_entries.emplace(ToCacheAddr(host_ptr));
}
auto& memory_manager = Core::System::GetInstance().GPU().MemoryManager();
const auto cpu_addr = *memory_manager.GpuToCpuAddress(gpu_addr);
auto entry = GetUncachedBuffer(cpu_addr, host_ptr);
entry->SetSize(size);
entry->SetInternalState(internalize);
Register(entry);
if (entry->GetCapacity() < size) {
entry->SetCapacity(CreateBuffer(size, GL_STATIC_DRAW), size);
}
glNamedBufferSubData(entry->GetBuffer(), 0, static_cast<GLintptr>(size), host_ptr);
return {entry->GetBuffer(), CachedBufferOffset};
}
void OGLBufferCache::GrowBuffer(std::shared_ptr<CachedBufferEntry>& entry, std::size_t new_size) {
const auto old_size = static_cast<GLintptr>(entry->GetSize());
if (entry->GetCapacity() < new_size) {
const auto old_buffer = entry->GetBuffer();
OGLBuffer new_buffer = CreateBuffer(new_size, GL_STATIC_COPY);
// Copy bits from the old buffer to the new buffer.
glCopyNamedBufferSubData(old_buffer, new_buffer.handle, 0, 0, old_size);
entry->SetCapacity(std::move(new_buffer), new_size);
}
// Upload the new bits.
const auto size_diff = static_cast<GLintptr>(new_size - old_size);
glNamedBufferSubData(entry->GetBuffer(), old_size, size_diff, entry->GetHostPtr() + old_size);
// Update entry's size in the object and in the cache.
entry->SetSize(new_size);
Unregister(entry);
Register(entry);
}
std::shared_ptr<CachedBufferEntry> OGLBufferCache::GetUncachedBuffer(VAddr cpu_addr, u8* host_ptr) {
if (auto entry = TryGetReservedBuffer(host_ptr); entry) {
return entry;
}
return std::make_shared<CachedBufferEntry>(cpu_addr, host_ptr);
}
std::shared_ptr<CachedBufferEntry> OGLBufferCache::TryGetReservedBuffer(u8* host_ptr) {
const auto it = buffer_reserve.find(ToCacheAddr(host_ptr));
if (it == buffer_reserve.end()) {
return {};
}
auto& reserve = it->second;
auto entry = reserve.back();
reserve.pop_back();
return entry;
}
void OGLBufferCache::ReserveBuffer(std::shared_ptr<CachedBufferEntry> entry) {
buffer_reserve[entry->GetCacheAddr()].push_back(std::move(entry));
}
void OGLBufferCache::AlignBuffer(std::size_t alignment) {
// Align the offset, not the mapped pointer
const GLintptr offset_aligned =
static_cast<GLintptr>(Common::AlignUp(static_cast<std::size_t>(buffer_offset), alignment));
buffer_ptr += offset_aligned - buffer_offset;
buffer_offset = offset_aligned;
}
} // namespace OpenGL
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