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/*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "pipe/p_defines.h"
#include "util/u_debug.h"
#include "util/u_split_draw.h"
bool
u_split_draw(const struct pipe_draw_info *info, uint32_t max_verts,
uint32_t *count, uint32_t *step)
{
if (*count <= max_verts) {
*step = *count;
return false;
}
switch (info->mode) {
case PIPE_PRIM_POINTS:
*count = *step = max_verts;
break;
case PIPE_PRIM_LINES:
*count = *step = max_verts - (max_verts % 2);
break;
case PIPE_PRIM_LINE_STRIP:
*count = max_verts;
*step = max_verts - 1;
break;
case PIPE_PRIM_LINE_LOOP:
*count = max_verts;
*step = max_verts - 1;
debug_warn_once("unhandled line loop "
"looping behavior with "
">max vert count\n");
break;
case PIPE_PRIM_TRIANGLES:
*count = *step = max_verts - (max_verts % 3);
break;
case PIPE_PRIM_TRIANGLE_STRIP:
*count = max_verts;
*step = max_verts - 2;
break;
default:
debug_warn_once("unhandled primitive "
"max vert count, truncating\n");
*count = *step = max_verts;
}
return true;
}
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