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static void FUNC(struct draw_pt_front_end *frontend,
pt_elt_func get_elt,
const void *elts,
unsigned count)
{
struct varray_frontend *varray = (struct varray_frontend *)frontend;
struct draw_context *draw = varray->draw;
unsigned start = (unsigned)elts;
boolean flatfirst = (draw->rasterizer->flatshade &&
draw->rasterizer->flatshade_first);
unsigned i, flags;
#if 0
debug_printf("%s (%d) %d/%d\n", __FUNCTION__, draw->prim, start, count);
#endif
#if 0
debug_printf("INPUT PRIM = %d (start = %d, count = %d)\n", varray->input_prim,
start, count);
#endif
for (i = 0; i < count; ++i) {
varray->fetch_elts[i] = start + i;
}
varray->fetch_count = count;
switch (varray->input_prim) {
case PIPE_PRIM_POINTS:
for (i = 0; i < count; i ++) {
POINT(varray, i + 0);
}
break;
case PIPE_PRIM_LINES:
for (i = 0; i+1 < count; i += 2) {
LINE(varray, 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(varray, flags, i - 1, i);
}
LINE(varray, flags, i - 1, 0);
}
break;
case PIPE_PRIM_LINE_STRIP:
flags = DRAW_PIPE_RESET_STIPPLE;
for (i = 1; i < count; i++, flags = 0) {
LINE(varray, flags, i - 1, i);
}
break;
case PIPE_PRIM_TRIANGLES:
for (i = 0; i+2 < count; i += 3) {
TRIANGLE(varray, 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++) {
TRIANGLE(varray, 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++) {
TRIANGLE(varray, 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) {
flags = DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL;
for (i = 0; i+2 < count; i++) {
TRIANGLE(varray, flags, i + 1, i + 2, 0);
}
}
else {
flags = DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL;
for (i = 0; i+2 < count; i++) {
TRIANGLE(varray, flags, 0, i + 1, i + 2);
}
}
}
break;
case PIPE_PRIM_QUADS:
for (i = 0; i+3 < count; i += 4) {
QUAD(varray, i + 0, i + 1, i + 2, i + 3);
}
break;
case PIPE_PRIM_QUAD_STRIP:
for (i = 0; i+3 < count; i += 2) {
QUAD(varray, i + 2, i + 0, i + 1, i + 3);
}
break;
case PIPE_PRIM_POLYGON:
{
/* These bitflags look a little odd because we submit the
* vertices as (1,2,0) to satisfy flatshade requirements.
*/
const unsigned edge_first = DRAW_PIPE_EDGE_FLAG_2;
const unsigned edge_middle = DRAW_PIPE_EDGE_FLAG_0;
const unsigned 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;
TRIANGLE(varray, flags, i + 1, i + 2, 0);
}
}
break;
default:
assert(0);
break;
}
varray_flush(varray);
}
#undef TRIANGLE
#undef QUAD
#undef POINT
#undef LINE
#undef FUNC
|
