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.

wined3d: Add a lower size bound for the streaming buffer allocation.
1c84acd0 · Anton Baskanov · Alexandre Julliard · 42503f4e · 1c84acd0
Commit 1c84acd0 authored Nov 17, 2022 by Anton Baskanov Committed by Alexandre Julliard Nov 24, 2022
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buffer.c dlls/wined3d/buffer.c +3 -1

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--- 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;