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Marek Olšák authored
OpenGL allows a buffer to be mapped only once, but we also map buffers internally, e.g. in the software primitive restart fallback, for PBOs, vbo_get_minmax_index, etc. This has always been a problem, but it will be a bigger problem with persistent buffer mappings, which will prevent all Mesa functions from mapping buffers for internal purposes. This adds a driver interface to core Mesa which supports multiple buffer mappings and allows 2 mappings: one for the GL user and one for Mesa. Note that Gallium supports an unlimited number of buffer and texture mappings, so it's not really an issue for Gallium. v2: fix unmapping in xm_dd.c, remove the GL errors there v3: fix the intel driver (by Fredrik) Reviewed-by: Fredrik Höglund <fredrik@kde.org>
dca35020