Anton Baskanov : wined3d: Add a lower size bound for the streaming buffer allocation.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 1c84acd0573176b0f3b4b33ecd58d8aec428270a
URL:    https://gitlab.winehq.org/wine/wine/-/commit/1c84acd0573176b0f3b4b33ecd58d8a...

Author: Anton Baskanov <baskanov(a)gmail.com>
Date:   Thu Nov 17 15:01:05 2022 +0700

wined3d: Add a lower size bound for the streaming buffer allocation.

Apps that issues many small draw calls (e.g. Earth 2150) may cause
frequent DISCARD maps, which are significantly slower than NOOVERWRITE
ones.

---

 dlls/wined3d/buffer.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/dlls/wined3d/buffer.c b/dlls/wined3d/buffer.c
index fca7f2916b7..74c2a1b8b2b 100644
--- a/dlls/wined3d/buffer.c
+++ b/dlls/wined3d/buffer.c
@@ -34,6 +34,8 @@ WINE_DEFAULT_DEBUG_CHANNEL(d3d);
 #define VB_MAXFULLCONVERSIONS 5       /* Number of full conversions before we stop converting */
 #define VB_RESETFULLCONVS     20      /* Reset full conversion counts after that number of draws */
 
+#define SB_MIN_SIZE (512 * 1024)    /* Minimum size of an allocated streaming buffer. */
+
 struct wined3d_buffer_ops
 {
     BOOL (*buffer_prepare_location)(struct wined3d_buffer *buffer,
@@ -1665,7 +1667,7 @@ static HRESULT wined3d_streaming_buffer_prepare(struct wined3d_device *device,
             return S_OK;
     }
 
-    size = max(old_size * 2, min_size);
+    size = max(SB_MIN_SIZE, max(old_size * 2, min_size));
     TRACE("Growing buffer to %u bytes.\n", size);
 
     desc.byte_width = size;