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|
static void FUNC( ARGS,
unsigned count )
{
LOCAL_VARS;
switch (prim) {
case PIPE_PRIM_POINTS:
for (i = 0; i < count; i ++) {
POINT( (i + 0) );
}
break;
case PIPE_PRIM_LINES:
for (i = 0; i+1 < count; i += 2) {
LINE( DRAW_PIPE_RESET_STIPPLE,
(i + 0),
(i + 1));
}
break;
case PIPE_PRIM_LINE_LOOP:
if (count >= 2) {
flags = DRAW_PIPE_RESET_STIPPLE;
for (i = 1; i < count; i++, flags = 0) {
LINE( flags,
(i - 1),
(i ));
}
LINE( flags,
(i - 1),
(0 ));
}
break;
case PIPE_PRIM_LINE_STRIP:
flags = DRAW_PIPE_RESET_STIPPLE;
for (i = 1; i < count; i++, flags = 0) {
LINE( flags,
(i - 1),
(i ));
}
break;
case PIPE_PRIM_TRIANGLES:
for (i = 0; i+2 < count; i += 3) {
TRIANGLE( DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL,
(i + 0),
(i + 1),
(i + 2 ));
}
break;
case PIPE_PRIM_TRIANGLE_STRIP:
if (flatfirst) {
for (i = 0; i+2 < count; i++) {
/* Emit first triangle vertex as first triangle vertex */
TRIANGLE( DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL,
(i + 0),
(i + 1 + (i&1)),
(i + 2 - (i&1)) );
}
}
else {
for (i = 0; i+2 < count; i++) {
/* Emit last triangle vertex as last triangle vertex */
TRIANGLE( DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL,
(i + 0 + (i&1)),
(i + 1 - (i&1)),
(i + 2 ));
}
}
break;
case PIPE_PRIM_TRIANGLE_FAN:
if (count >= 3) {
if (flatfirst) {
for (i = 0; i+2 < count; i++) {
TRIANGLE( DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL,
(i + 1),
(i + 2),
0 );
}
}
else {
for (i = 0; i+2 < count; i++) {
TRIANGLE( DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL,
(0),
(i + 1),
(i + 2 ));
}
}
}
break;
case PIPE_PRIM_QUADS:
/* GL quads don't follow provoking vertex convention */
if (flatfirst) {
for (i = 0; i+3 < count; i += 4) {
/* emit last quad vertex as first triangle vertex */
QUAD_FIRST_PV( (i + 3),
(i + 0),
(i + 1),
(i + 2) );
}
}
else {
for (i = 0; i+3 < count; i += 4) {
/* emit last quad vertex as last triangle vertex */
QUAD_LAST_PV( (i + 0),
(i + 1),
(i + 2),
(i + 3) );
}
}
break;
case PIPE_PRIM_QUAD_STRIP:
/* GL quad strips don't follow provoking vertex convention */
if (flatfirst) {
for (i = 0; i+3 < count; i += 2) {
/* emit last quad vertex as first triangle vertex */
QUAD_FIRST_PV( (i + 3),
(i + 2),
(i + 0),
(i + 1) );
}
}
else {
for (i = 0; i+3 < count; i += 2) {
/* emit last quad vertex as last triangle vertex */
QUAD_LAST_PV( (i + 2),
(i + 0),
(i + 1),
(i + 3) );
}
}
break;
case PIPE_PRIM_POLYGON:
/* GL polygons don't follow provoking vertex convention */
{
/* These bitflags look a little odd because we submit the
* vertices as (1,2,0) to satisfy flatshade requirements.
*/
const ushort edge_first = DRAW_PIPE_EDGE_FLAG_2;
const ushort edge_middle = DRAW_PIPE_EDGE_FLAG_0;
const ushort edge_last = DRAW_PIPE_EDGE_FLAG_1;
flags = DRAW_PIPE_RESET_STIPPLE | edge_first | edge_middle;
for (i = 0; i+2 < count; i++, flags = edge_middle) {
if (i + 3 == count)
flags |= edge_last;
if (flatfirst) {
/* emit first polygon vertex as first triangle vertex */
TRIANGLE( flags,
(0),
(i + 1),
(i + 2) );
}
else {
/* emit first polygon vertex as last triangle vertex */
TRIANGLE( flags,
(i + 1),
(i + 2),
(0));
}
}
}
break;
default:
assert(0);
break;
}
FLUSH;
}
#undef TRIANGLE
#undef QUAD_FIRST_PV
#undef QUAD_LAST_PV
#undef POINT
#undef LINE
#undef FUNC
|
