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struct gl_renderbuffer Base;
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struct pipe_resource *texture;
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struct pipe_surface *surface; /* temporary view into texture */
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enum pipe_format format; /** preferred format, or PIPE_FORMAT_NONE */
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GLboolean defined; /**< defined contents? */
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* Used only when hardware accumulation buffers are not supported.
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struct st_texture_object *rtt; /**< GL render to texture's texture */
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int rtt_level, rtt_face, rtt_slice;