fabi/Xenia-Canary
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[GPU] Double-buffer readback_resolve.

Browse Source 
Introduce "fast" readback resolve that reads from previous frame's
resolve buffers, quick swap between buffers each frame to avoid
copies so minimal performance impact and mostly correct bahavior.
Checks if previous frame had a buffer for the current resolve and
falls through to the slow path, which also allows to support
"screenshot" features in the games that do that without stalling
on normal resolve operations.

Re-enabled readback_memexport as separate feature, was previously
bundled with readback_resolve (probably not intentionally) and
ensures destination address is writeable to avoid memory access
related crashes and unnecessary work.

readback_resolve cvar changes from bool to string ternary with
"none", "fast" and "full" options, defaulting to the new "fast"
mode.
This commit is contained in:
Herman S.
2025-10-31 21:20:37 +09:00
committed by Radosław Gliński
parent 93adb2bb95
commit e2c33686cc
8 changed files with 482 additions and 124 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
src/xenia/gpu/d3d12/d3d12_command_processor.h
View File

@@ -692,8 +692,19 @@ class D3D12CommandProcessor final : public CommandProcessor {
D3D12_RESOURCE_STATES scratch_buffer_state_;
bool scratch_buffer_used_ = false;
ID3D12Resource* readback_buffer_ = nullptr;
uint32_t readback_buffer_size_ = 0;
// Per-resolve double-buffered readback for delayed sync
struct ReadbackBuffer {
ID3D12Resource* buffers[2] = {nullptr, nullptr};
uint32_t sizes[2] = {0, 0};
uint32_t current_index = 0;
uint64_t last_used_frame = 0;
};
// Map: (written_address << 32 | written_length) -> ReadbackBuffer
std::unordered_map<uint64_t, ReadbackBuffer> readback_buffers_;
// Simple single buffer for memexport (always syncs, no double-buffering)
ID3D12Resource* memexport_readback_buffer_ = nullptr;
uint32_t memexport_readback_buffer_size_ = 0;
// The current fixed-function drawing state.
D3D12_VIEWPORT ff_viewport_;