On Sat, Mar 17, 2018 at 2:12 PM, Erico Nunes <nunes.er...@gmail.com> wrote: > Hi all, > > I have been working to add indexed drawing/glDrawElements support to > the mesa-lima driver currently in development > (https://github.com/yuq/mesa-lima). > For that implementation, it seems that we need to have the minimum and > maximum index values from the index buffer available in order to set > up a proper command stream. > Mesa provides these values in pipe_draw_info.min_index and > pipe_draw_info.max_index, however in some cases we noticed that it
Do you truly need these? Or would approximate values do? For an approximation, you can use the sizes of the bound vbo's to guess a min/max index. See https://cgit.freedesktop.org/mesa/mesa/tree/src/gallium/drivers/vc4/vc4_draw.c#n183 for an example. You can also scan through the index buffer yourself, although it's obviously slow. There are helpers like u_vbuf_get_minmax_index (esp if you're using the u_vbuf module). I don't know of any hardware that really needs these to be exact though. -ilia _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
