video_core: lower memory limits again

src/video_core/buffer_cache/buffer_cache.h

@@ -30,8 +30,8 @@ BufferCache<P>::BufferCache(VideoCore::RasterizerInterface& rasterizer_,
     }
 
     const s64 device_memory = static_cast<s64>(runtime.GetDeviceLocalMemory());
-    const s64 min_spacing_expected = device_memory - 1_GiB;
-    const s64 min_spacing_critical = device_memory - 512_MiB;
+    const s64 min_spacing_expected = device_memory - 1_GiB - 512_MiB;
+    const s64 min_spacing_critical = device_memory - 1_GiB;
     const s64 mem_threshold = std::min(device_memory, TARGET_THRESHOLD);
     const s64 min_vacancy_expected = (6 * mem_threshold) / 10;
     const s64 min_vacancy_critical = (3 * mem_threshold) / 10;

src/video_core/texture_cache/texture_cache.h

@@ -49,8 +49,8 @@ TextureCache<P>::TextureCache(Runtime& runtime_, VideoCore::RasterizerInterface&
 
     if constexpr (HAS_DEVICE_MEMORY_INFO) {
         const s64 device_memory = static_cast<s64>(runtime.GetDeviceLocalMemory());
-        const s64 min_spacing_expected = device_memory - 1_GiB;
-        const s64 min_spacing_critical = device_memory - 512_MiB;
+        const s64 min_spacing_expected = device_memory - 1_GiB - 512_MiB;
+        const s64 min_spacing_critical = device_memory - 1_GiB;
         const s64 mem_threshold = std::min(device_memory, TARGET_THRESHOLD);
         const s64 min_vacancy_expected = (6 * mem_threshold) / 10;
         const s64 min_vacancy_critical = (3 * mem_threshold) / 10;