mesa: add comment to clarify ctx->Driver.MapBufferRange() return value
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@ -575,7 +575,8 @@ struct dd_function_table {
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GLintptr readOffset, GLintptr writeOffset,
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GLsizeiptr size );
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/* May return NULL if MESA_MAP_NOWAIT_BIT is set in access:
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/* Returns pointer to the start of the mapped range.
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* May return NULL if MESA_MAP_NOWAIT_BIT is set in access:
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*/
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void * (*MapBufferRange)( struct gl_context *ctx, GLintptr offset,
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GLsizeiptr length, GLbitfield access,
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