679  * Find an idle back buffer. If there isn't one, then
697       /* Reuse current back buffer if it's idle */  in dri3_find_back()
705    /* Check whether we need to reuse the current back buffer as new back.  in dri3_find_back()
720     * Unigine Superposition hits this and this allows to use 2 back buffers  in dri3_find_back()
838    struct loader_dri3_buffer *back;  in loader_dri3_copy_sub_buffer()  local
849    back = dri3_find_back_alloc(draw);  in loader_dri3_copy_sub_buffer()
850    if (!back)  in loader_dri3_copy_sub_buffer()
856       /* Update the linear buffer part of the back buffer  in loader_dri3_copy_sub_buffer()
860                                     back->linear_buffer,  in loader_dri3_copy_sub_buffer()
861                                     back->image,  in loader_dri3_copy_sub_buffer()
862                                     0, 0, back->width, back->height,  in loader_dri3_copy_sub_buffer()
867    dri3_fence_reset(draw->conn, back);  in loader_dri3_copy_sub_buffer()
869                   back->pixmap,  in loader_dri3_copy_sub_buffer()
873    dri3_fence_trigger(draw->conn, back);  in loader_dri3_copy_sub_buffer()
880                                back->image,  in loader_dri3_copy_sub_buffer()
886                      back->pixmap,  in loader_dri3_copy_sub_buffer()
893    dri3_fence_await(draw->conn, draw, back);  in loader_dri3_copy_sub_buffer()
932     * Copy back to the tiled buffer we use for rendering.  in loader_dri3_wait_x()
998  * Make the current back buffer visible using the present extension
1007    struct loader_dri3_buffer *back;  in loader_dri3_swap_buffers_msc()  local
1016     *   GLX pixmaps may be created with a config that includes back buffers and  in loader_dri3_swap_buffers_msc()
1019     *   It is possible to create a pbuffer with back buffers and to swap the  in loader_dri3_swap_buffers_msc()
1020     *   front and back buffers by calling glXSwapBuffers.  in loader_dri3_swap_buffers_msc()
1024     *   If surface is a back-buffered window surface, then the color buffer is  in loader_dri3_swap_buffers_msc()
1041    back = dri3_find_back_alloc(draw);  in loader_dri3_swap_buffers_msc()
1043    if (!back)  in loader_dri3_swap_buffers_msc()
1056                                     back->linear_buffer,  in loader_dri3_swap_buffers_msc()
1057                                     back->image,  in loader_dri3_swap_buffers_msc()
1058                                     0, 0, back->width, back->height,  in loader_dri3_swap_buffers_msc()
1062    /* If we need to preload the new back buffer, remember the source.  in loader_dri3_swap_buffers_msc()
1064     * the back buffer across a call to this function.  in loader_dri3_swap_buffers_msc()
1069    /* Exchange the back and fake front. Even though the server knows about these  in loader_dri3_swap_buffers_msc()
1070     * buffers, it has no notion of back and fake front.  in loader_dri3_swap_buffers_msc()
1076       draw->buffers[LOADER_DRI3_FRONT_ID] = back;  in loader_dri3_swap_buffers_msc()
1086       dri3_fence_reset(draw->conn, back);  in loader_dri3_swap_buffers_msc()
1131       /* If we need to populate the new back, but need to reuse the back  in loader_dri3_swap_buffers_msc()
1141       back->busy = 1;  in loader_dri3_swap_buffers_msc()
1142       back->last_swap = draw->send_sbc;  in loader_dri3_swap_buffers_msc()
1167                          back->pixmap,  in loader_dri3_swap_buffers_msc()
1175                          back->sync_fence,  in loader_dri3_swap_buffers_msc()
1188       draw->recv_sbc = back->last_swap = draw->send_sbc;  in loader_dri3_swap_buffers_msc()
1191        * locally blit back buffer image to it is enough. Otherwise front buffer  in loader_dri3_swap_buffers_msc()
1197                                   back->image,  in loader_dri3_swap_buffers_msc()
1200          dri3_copy_area(draw->conn, back->pixmap,  in loader_dri3_swap_buffers_msc()
1209    /* Schedule a server-side back-preserving blit if necessary.  in loader_dri3_swap_buffers_msc()
1212     * b) We need to preserve the back buffer,  in loader_dri3_swap_buffers_msc()
1235     * relying on it receiving back control immediately.  in loader_dri3_swap_buffers_msc()
1252     * By waiting here on a new buffer and only then returning back to the client  in loader_dri3_swap_buffers_msc()
1267    struct loader_dri3_buffer *back = dri3_find_back_alloc(draw);  in loader_dri3_query_buffer_age()  local
1272    if (back && back->last_swap != 0)  in loader_dri3_query_buffer_age()
1273       ret = draw->send_sbc - back->last_swap + 1;  in loader_dri3_query_buffer_age()
1721     * Otherwise, we'll get a BadWindow error back from this request which  in dri3_detect_drawable_is_window()
2038  * Find a front or back buffer, allocating new ones as necessary
2142     * a tradeoff. If we're ok with the wait we can reduce the number of back  in dri3_get_buffer()
2168  * Free the front bufffer or all of the back buffers. Used
2214    struct loader_dri3_buffer   *front, *back;  in loader_dri3_get_buffers()  local
2219    buffers->back = NULL;  in loader_dri3_get_buffers()
2226    /* Free no longer needed back buffers */  in loader_dri3_get_buffers()
2230       back = draw->buffers[buf_id];  in loader_dri3_get_buffers()
2231       if (!back || !back->last_swap || draw->cur_blit_source == buf_id)  in loader_dri3_get_buffers()
2234       buffer_age = draw->send_sbc - back->last_swap + 1;  in loader_dri3_get_buffers()
2274       back = dri3_get_buffer(driDrawable,  in loader_dri3_get_buffers()
2278       if (!back)  in loader_dri3_get_buffers()
2284       back = NULL;  in loader_dri3_get_buffers()
2295    if (back) {  in loader_dri3_get_buffers()
2297       buffers->back = back->image;  in loader_dri3_get_buffers()
2364  * Find a backbuffer slot - potentially allocating a back buffer
2366  * \param draw[in,out]  Pointer to the drawable for which to find back.
2367  * \return Pointer to a new back buffer or NULL if allocation failed or was
2370  * Find a potentially new back buffer, and if it's not been allocated yet and
2376    struct loader_dri3_buffer *back;  in dri3_find_back_alloc()  local
2383    back = draw->buffers[id];  in dri3_find_back_alloc()
2384    /* Allocate a new back if we haven't got one */  in dri3_find_back_alloc()
2385    if (!back && draw->back_format != __DRI_IMAGE_FORMAT_NONE &&  in dri3_find_back_alloc()
2387       back = dri3_alloc_render_buffer(draw, draw->back_format,  in dri3_find_back_alloc()
2390    if (!back)  in dri3_find_back_alloc()
2393    dri3_set_render_buffer(draw, id, back);  in dri3_find_back_alloc()
2395    /* If necessary, prefill the back with data. */  in dri3_find_back_alloc()
2398        back != draw->buffers[draw->cur_blit_source]) {  in dri3_find_back_alloc()
2402       dri3_fence_await(draw->conn, draw, back);  in dri3_find_back_alloc()
2404                                     back->image,  in dri3_find_back_alloc()
2408       back->last_swap = source->last_swap;  in dri3_find_back_alloc()
2412    return back;  in dri3_find_back_alloc()