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[buffer_cache] Add option to control GPU buffer readback (#4126)

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Added an option to control the GPU buffer readback, as it causes issues if the hardware cannot keep up with the additional workload.

Some games require this to render certain effects properly.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4126
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MaranBr 2026-06-27 08:38:04 +02:00 • committed by crueter
parent 0d6a2158f0
commit b4b41ee62c
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GPG key ID: 425ACD2D4830EBC6
3 changed files with 19 additions and 8 deletions
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18
src/video_core/buffer_cache/buffer_cache.h
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@ -1634,15 +1634,17 @@ bool BufferCache<P>::SynchronizeBuffer(Buffer& buffer, DAddr device_addr, u32 si
if (total_size_bytes == 0) {
return true;
}
u64 min_offset = (std::numeric_limits<u64>::max)();
u64 max_offset = 0;
for (const auto& copy : upload_copies) {
min_offset = (std::min)(min_offset, copy.dst_offset);
max_offset = (std::max)(max_offset, copy.dst_offset + copy.size);
if (Settings::values.enable_gpu_buffer_readback.GetValue()) {
u64 min_offset = (std::numeric_limits<u64>::max)();
u64 max_offset = 0;
for (const auto& copy : upload_copies) {
min_offset = (std::min)(min_offset, copy.dst_offset);
max_offset = (std::max)(max_offset, copy.dst_offset + copy.size);
}
const DAddr sync_addr = buffer.CpuAddr() + min_offset;
const u64 sync_size = max_offset - min_offset;
DownloadBufferMemory(buffer, sync_addr, sync_size);
}
const DAddr sync_addr = buffer.CpuAddr() + min_offset;
const u64 sync_size = max_offset - min_offset;
DownloadBufferMemory(buffer, sync_addr, sync_size);
const std::span<BufferCopy> copies_span(upload_copies.data(), upload_copies.size());
UploadMemory(buffer, total_size_bytes, largest_copy, copies_span);
any_buffer_uploaded = true;