src/gallium/auxiliary/util/u_split_draw.h

   1 /*
   2  * Permission is hereby granted, free of charge, to any person obtaining a
   3  * copy of this software and associated documentation files (the "Software"),
   4  * to deal in the Software without restriction, including without limitation
   5  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   6  * and/or sell copies of the Software, and to permit persons to whom the
   7  * Software is furnished to do so, subject to the following conditions:
   8  *
   9  * The above copyright notice and this permission notice (including the next
  10  * paragraph) shall be included in all copies or substantial portions of the
  11  * Software.
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  16  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  17  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  18  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  19  * IN THE SOFTWARE.
  20  */
  21
  22 #ifndef U_SPLIT_DRAW_H
  23 #define U_SPLIT_DRAW_H
  24
  25 #include "pipe/p_state.h"
  26
  27 /**
  28  * For non-indexed drawing, this function helps work around hardware
  29  * limits on the number of verts in a single draw.
  30  *
  31  * For the given mode of primitive from info, calculate the count and
  32  * step in the buffer so the draw can be split into multiple draws.
  33  *
  34  * \param info      pointer to the original pipe_draw_info from draw_vbo
  35  * \param max_verts max number of vertices that can be handled by the hardware
  36  * \param count     number of vertices remaining in the draw call. It is also
  37  *                  used as a return parameter, containing how many vertices
  38  *                  should be sent in the next job to the hardware.
  39  * \param step      return parameter, will contain how many vertices should be
  40  *                  skipped from the original count on the next call to this
  41  *                  function (may differ from count if the primitive mode
  42  *                  requires the last vertices to be reused in the next draw)
  43  */
  44 bool
  45 u_split_draw(const struct pipe_draw_info *info, uint32_t max_verts,
  46              uint32_t *count, uint32_t *step);
  47
  48 #endif