wined3d: Optimize scanning changed sampler states in wined3d_device_apply_stateblock().

Signed-off-by: Matteo Bruni <mbruni@codeweavers.com> Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

wined3d: Optimize scanning changed sampler states in wined3d_device_apply_stateblock().
fcd51de6 · Matteo Bruni · Alexandre Julliard · ebc96e32 · fcd51de6
Commit fcd51de6 authored Feb 28, 2020 by Matteo Bruni Committed by Alexandre Julliard Feb 28, 2020
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device.c dlls/wined3d/device.c +6 -4

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--- a/dlls/wined3d/device.c
+++ b/dlls/wined3d/device.c
@@ -3961,15 +3961,17 @@ void CDECL wined3d_device_apply_stateblock(struct wined3d_device *device,
        }
    }

-    for (i = 0; i < ARRAY_SIZE(state->sampler_states); ++i)
+    for (i = 0; i < ARRAY_SIZE(changed->samplerState); ++i)
    {
        DWORD stage = i;
+
        if (stage >= WINED3D_MAX_FRAGMENT_SAMPLERS)
            stage += WINED3DVERTEXTEXTURESAMPLER0 - WINED3D_MAX_FRAGMENT_SAMPLERS;
-        for (j = 0; j < ARRAY_SIZE(state->sampler_states[j]); ++j)
+        map = changed->samplerState[i];
+        while (map)
        {
-            if (changed->samplerState[i] & (1 << j))
-                wined3d_device_set_sampler_state(device, stage, j, state->sampler_states[i][j]);
+            j = wined3d_bit_scan(&map);
+            wined3d_device_set_sampler_state(device, stage, j, state->sampler_states[i][j]);
        }
    }