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/*
* Mesa 3-D graphics library
*
* Copyright 2008 VMware, Inc.
* Copyright (C) 2010 LunarG Inc.
*
* 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 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.
*/
static void
FUNC(FUNC_VARS)
{
unsigned first, incr;
LOCAL_VARS
/*
* prim, start, count, and max_count_{simple,loop,fan} should have been
* defined
*/
if (0) {
debug_printf("%s: prim 0x%x, start %d, count %d, max_count_simple %d, "
"max_count_loop %d, max_count_fan %d\n",
__FUNCTION__, prim, start, count, max_count_simple,
max_count_loop, max_count_fan);
}
draw_pt_split_prim(prim, &first, &incr);
/* sanitize primitive length */
count = draw_pt_trim_count(count, first, incr);
if (count < first)
return;
/* try flushing the entire primitive */
if (PRIMITIVE(start, count))
return;
/* must be able to at least flush two complete primitives */
assert(max_count_simple >= first + incr &&
max_count_loop >= first + incr &&
max_count_fan >= first + incr);
/* no splitting required */
if (count <= max_count_simple) {
SEGMENT_SIMPLE(0x0, start, count);
}
else {
const unsigned rollback = first - incr;
unsigned flags = DRAW_SPLIT_AFTER, seg_start = 0, seg_max;
/*
* Both count and seg_max below are explicitly trimmed. Because
*
* seg_start = N * (seg_max - rollback) = N' * incr,
*
* we have
*
* remaining = count - seg_start = first + N'' * incr.
*
* That is, remaining is implicitly trimmed.
*/
switch (prim) {
case PIPE_PRIM_POINTS:
case PIPE_PRIM_LINES:
case PIPE_PRIM_LINE_STRIP:
case PIPE_PRIM_TRIANGLES:
case PIPE_PRIM_TRIANGLE_STRIP:
case PIPE_PRIM_QUADS:
case PIPE_PRIM_QUAD_STRIP:
case PIPE_PRIM_LINES_ADJACENCY:
case PIPE_PRIM_LINE_STRIP_ADJACENCY:
case PIPE_PRIM_TRIANGLES_ADJACENCY:
case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
seg_max =
draw_pt_trim_count(MIN2(max_count_simple, count), first, incr);
if (prim == PIPE_PRIM_TRIANGLE_STRIP ||
prim == PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY) {
/* make sure we flush even number of triangles at a time */
if (seg_max < count && !(((seg_max - first) / incr) & 1))
seg_max -= incr;
}
do {
const unsigned remaining = count - seg_start;
if (remaining > seg_max) {
SEGMENT_SIMPLE(flags, start + seg_start, seg_max);
seg_start += seg_max - rollback;
flags |= DRAW_SPLIT_BEFORE;
}
else {
flags &= ~DRAW_SPLIT_AFTER;
SEGMENT_SIMPLE(flags, start + seg_start, remaining);
seg_start += remaining;
}
} while (seg_start < count);
break;
case PIPE_PRIM_LINE_LOOP:
seg_max =
draw_pt_trim_count(MIN2(max_count_loop, count), first, incr);
do {
const unsigned remaining = count - seg_start;
if (remaining > seg_max) {
SEGMENT_LOOP(flags, start + seg_start, seg_max, start);
seg_start += seg_max - rollback;
flags |= DRAW_SPLIT_BEFORE;
}
else {
flags &= ~DRAW_SPLIT_AFTER;
SEGMENT_LOOP(flags, start + seg_start, remaining, start);
seg_start += remaining;
}
} while (seg_start < count);
break;
case PIPE_PRIM_TRIANGLE_FAN:
case PIPE_PRIM_POLYGON:
seg_max =
draw_pt_trim_count(MIN2(max_count_fan, count), first, incr);
do {
const unsigned remaining = count - seg_start;
if (remaining > seg_max) {
SEGMENT_FAN(flags, start + seg_start, seg_max, start);
seg_start += seg_max - rollback;
flags |= DRAW_SPLIT_BEFORE;
}
else {
flags &= ~DRAW_SPLIT_AFTER;
SEGMENT_FAN(flags, start + seg_start, remaining, start);
seg_start += remaining;
}
} while (seg_start < count);
break;
default:
assert(0);
break;
}
}
}
#undef FUNC
#undef FUNC_VARS
#undef LOCAL_VARS
#undef PRIMITIVE
#undef SEGMENT_SIMPLE
#undef SEGMENT_LOOP
#undef SEGMENT_FAN
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