gallium: comment/document usage flags
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@ -121,7 +121,9 @@ struct pipe_screen {
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void (*texture_destroy)(struct pipe_texture *pt);
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/** Get a surface which is a "view" into a texture */
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/** Get a 2D surface which is a "view" into a texture
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* \param usage bitmaks of PIPE_BUFFER_USAGE_* read/write flags
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*/
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struct pipe_surface *(*get_tex_surface)(struct pipe_screen *,
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struct pipe_texture *texture,
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unsigned face, unsigned level,
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