From bc148d070131d67ff44e32bfa6de766b890fd968 Mon Sep 17 00:00:00 2001
From: IndecisiveTurtle <47210458+raphaelthegreat@users.noreply.github.com>
Date: Mon, 23 Jun 2025 12:16:03 +0300
Subject: [PATCH] buffer_cache: Dont create buffers on ReadMemory

---
 src/video_core/buffer_cache/buffer_cache.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/video_core/buffer_cache/buffer_cache.cpp b/src/video_core/buffer_cache/buffer_cache.cpp
index d16c64064..5f4996d21 100644
--- a/src/video_core/buffer_cache/buffer_cache.cpp
+++ b/src/video_core/buffer_cache/buffer_cache.cpp
@@ -140,8 +140,14 @@ void BufferCache::InvalidateMemory(VAddr device_addr, u64 size) {
 }
 
 void BufferCache::ReadMemory(VAddr device_addr, u64 size) {
-    Buffer& buffer = slot_buffers[FindBuffer(device_addr, size)];
-    DownloadBufferMemory(buffer, device_addr, size);
+    ForEachBufferInRange(device_addr, size, [this, device_addr, size](BufferId buffer_id, Buffer& buffer) {
+        const VAddr buffer_start = buffer.CpuAddr();
+        const VAddr buffer_end = buffer_start + buffer.SizeBytes();
+        const VAddr download_start = std::max(buffer_start, device_addr);
+        const VAddr download_end = std::min(buffer_end, device_addr + size);
+        const u64 download_size = download_end - download_start;
+        DownloadBufferMemory(buffer, download_start, download_size);
+    });
 }
 
 void BufferCache::DownloadBufferMemory(const Buffer& buffer, VAddr device_addr, u64 size) {