vulkan: don't make small images unbacked when device memory runs out

When VRAM ran out, any image that failed to allocate became a sparse
image with nothing bound, which AMD's drivers don't survive being
sampled (an RX 6600 died mid-flood, an RX 7800 XT made 211 of them,
8x8 ones included). Try host memory first, and count the images that
didn't fit: the texture cache then keeps more room under the budget
(512 MiB a step, up to 3 GiB, decaying) so its collector runs earlier.
The sparse fallback stays for images too large to back.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/video_core/renderer_vulkan/vk_texture_cache.h b/src/video_core/renderer_vulkan/vk_texture_cache.h
index e7ae9752a8..5ac833e787 100644
--- a/src/video_core/renderer_vulkan/vk_texture_cache.h
+++ b/src/video_core/renderer_vulkan/vk_texture_cache.h
@@ -76,6 +76,11 @@ public:
 
     bool CanReportMemoryUsage() const;
 
+    /// Images that did not fit the device memory budget so far (see MemoryAllocator).
+    u32 MemoryPressureEvents() const noexcept {
+        return memory_allocator.MemoryPressureEvents();
+    }
+
     void LogMemoryStatistics() const;
 
     /// True when ASTC is re-compressed to BC3 and opaque images may use BC1 instead.