wined3d: Factor out wined3d_texture_get_gl_sample_count() function.

dlls/wined3d/texture.c

@@ -456,6 +456,31 @@ static void gltexture_delete(struct wined3d_device *device, const struct wined3d
     tex->name = 0;
 }
 
+static unsigned int wined3d_texture_get_gl_sample_count(const struct wined3d_texture *texture)
+{
+    const struct wined3d_format *format = texture->resource.format;
+
+    /* We advertise as many WINED3D_MULTISAMPLE_NON_MASKABLE quality
+     * levels as the count of advertised multisample types for the texture
+     * format. */
+    if (texture->resource.multisample_type == WINED3D_MULTISAMPLE_NON_MASKABLE)
+    {
+        unsigned int i, count = 0;
+
+        for (i = 0; i < sizeof(format->multisample_types) * CHAR_BIT; ++i)
+        {
+            if (format->multisample_types & 1u << i)
+            {
+                if (texture->resource.multisample_quality == count++)
+                    break;
+            }
+        }
+        return i + 1;
+    }
+
+    return texture->resource.multisample_type;
+}
+
 /* Context activation is done by the caller. */
 /* The caller is responsible for binding the correct texture. */
 static void wined3d_texture_allocate_gl_mutable_storage(struct wined3d_texture *texture,
@@ -1484,27 +1509,7 @@ static void wined3d_texture_prepare_rb(struct wined3d_texture *texture,
          * AMD have a similar feature called Enhanced Quality Anti-Aliasing
          * (EQAA), but it does not have an equivalent OpenGL extension. */
 
-        /* We advertise as many WINED3D_MULTISAMPLE_NON_MASKABLE quality
-         * levels as the count of advertised multisample types for the texture
-         * format. */
-        if (texture->resource.multisample_type == WINED3D_MULTISAMPLE_NON_MASKABLE)
-        {
-            unsigned int i, count = 0;
-
-            for (i = 0; i < sizeof(format->multisample_types) * 8; ++i)
-            {
-                if (format->multisample_types & 1u << i)
-                {
-                    if (texture->resource.multisample_quality == count++)
-                        break;
-                }
-            }
-            samples = i + 1;
-        }
-        else
-        {
-            samples = texture->resource.multisample_type;
-        }
+        samples = wined3d_texture_get_gl_sample_count(texture);
 
         gl_info->fbo_ops.glGenRenderbuffers(1, &texture->rb_multisample);
         gl_info->fbo_ops.glBindRenderbuffer(GL_RENDERBUFFER, texture->rb_multisample);