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Merge pull request #4001 from ReinUsesLisp/avoid-copies
buffer_cache: Avoid copying twice on certain cases
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commit
4511502ca6
@ -56,24 +56,28 @@ public:
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if (use_fast_cbuf || size < max_stream_size) {
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if (!is_written && !IsRegionWritten(cpu_addr, cpu_addr + size - 1)) {
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auto& memory_manager = system.GPU().MemoryManager();
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const bool is_granular = memory_manager.IsGranularRange(gpu_addr, size);
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if (use_fast_cbuf) {
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if (memory_manager.IsGranularRange(gpu_addr, size)) {
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const auto host_ptr = memory_manager.GetPointer(gpu_addr);
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return ConstBufferUpload(host_ptr, size);
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u8* dest;
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if (is_granular) {
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dest = memory_manager.GetPointer(gpu_addr);
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} else {
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staging_buffer.resize(size);
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memory_manager.ReadBlockUnsafe(gpu_addr, staging_buffer.data(), size);
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return ConstBufferUpload(staging_buffer.data(), size);
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dest = staging_buffer.data();
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memory_manager.ReadBlockUnsafe(gpu_addr, dest, size);
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}
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return ConstBufferUpload(dest, size);
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}
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if (is_granular) {
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u8* const host_ptr = memory_manager.GetPointer(gpu_addr);
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return StreamBufferUpload(size, alignment, [host_ptr, size](u8* dest) {
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std::memcpy(dest, host_ptr, size);
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});
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} else {
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if (memory_manager.IsGranularRange(gpu_addr, size)) {
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const auto host_ptr = memory_manager.GetPointer(gpu_addr);
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return StreamBufferUpload(host_ptr, size, alignment);
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} else {
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staging_buffer.resize(size);
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memory_manager.ReadBlockUnsafe(gpu_addr, staging_buffer.data(), size);
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return StreamBufferUpload(staging_buffer.data(), size, alignment);
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}
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return StreamBufferUpload(
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size, alignment, [&memory_manager, gpu_addr, size](u8* dest) {
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memory_manager.ReadBlockUnsafe(gpu_addr, dest, size);
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});
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}
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}
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}
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@ -101,7 +105,9 @@ public:
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BufferInfo UploadHostMemory(const void* raw_pointer, std::size_t size,
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std::size_t alignment = 4) {
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std::lock_guard lock{mutex};
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return StreamBufferUpload(raw_pointer, size, alignment);
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return StreamBufferUpload(size, alignment, [raw_pointer, size](u8* dest) {
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std::memcpy(dest, raw_pointer, size);
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});
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}
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void Map(std::size_t max_size) {
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@ -424,11 +430,11 @@ private:
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map->MarkAsModified(false, 0);
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}
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BufferInfo StreamBufferUpload(const void* raw_pointer, std::size_t size,
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std::size_t alignment) {
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template <typename Callable>
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BufferInfo StreamBufferUpload(std::size_t size, std::size_t alignment, Callable&& callable) {
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AlignBuffer(alignment);
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const std::size_t uploaded_offset = buffer_offset;
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std::memcpy(buffer_ptr, raw_pointer, size);
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callable(buffer_ptr);
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buffer_ptr += size;
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buffer_offset += size;
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