wined3d: Introduce wined3d_bit_scan().

Signed-off-by: Józef Kucia <jkucia@codeweavers.com> Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

wined3d: Introduce wined3d_bit_scan().
e8d2feba · Józef Kucia · Alexandre Julliard · 7ccae68f · e8d2feba
Commit e8d2feba authored Feb 06, 2018 by Józef Kucia Committed by Alexandre Julliard Feb 06, 2018
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wined3d_private.h dlls/wined3d/wined3d_private.h +7 -0

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--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -4352,6 +4352,13 @@ static inline BOOL is_rasterization_disabled(const struct wined3d_shader *geomet
            && geometry_shader->u.gs.so_desc.rasterizer_stream_idx == WINED3D_NO_RASTERIZER_STREAM;
 }

+static inline int wined3d_bit_scan(unsigned int *x)
+{
+    int bit_offset = ffs(*x) - 1;
+    *x ^= 1u << bit_offset;
+    return bit_offset;
+}
+
 static inline DWORD wined3d_extract_bits(const DWORD *bitstream,
        unsigned int offset, unsigned int count)
 {