/**
* Do setup for triangle rasterization, then render the triangle.
*/
void sp_setup_tri( struct setup_context *setup,
const float (*v0)[4],
const float (*v1)[4],
const float (*v2)[4] )
{
float det;
#if DEBUG_VERTS
debug_printf("Setup triangle:\n");
print_vertex(setup, v0);
print_vertex(setup, v1);
print_vertex(setup, v2);
#endif
if (setup->softpipe->no_rast)
return;
det = calc_det(v0, v1, v2);
/*
debug_printf("%s\n", __FUNCTION__ );
*/
#if DEBUG_FRAGS
setup->numFragsEmitted = 0;
setup->numFragsWritten = 0;
#endif
if (cull_tri( setup, det ))
return;
if (!setup_sort_vertices( setup, det, v0, v1, v2 ))
return;
setup_tri_coefficients( setup );
setup_tri_edges( setup );
assert(setup->softpipe->reduced_prim == PIPE_PRIM_TRIANGLES);
setup->span.y = 0;
setup->span.right[0] = 0;
setup->span.right[1] = 0;
/* setup->span.z_mode = tri_z_mode( setup->ctx ); */
/* init_constant_attribs( setup ); */
if (setup->oneoverarea < 0.0) {
/* emaj on left:
*/
subtriangle( setup, &setup->emaj, &setup->ebot, setup->ebot.lines );
subtriangle( setup, &setup->emaj, &setup->etop, setup->etop.lines );
}
else {
/* emaj on right:
*/
subtriangle( setup, &setup->ebot, &setup->emaj, setup->ebot.lines );
subtriangle( setup, &setup->etop, &setup->emaj, setup->etop.lines );
}
flush_spans( setup );
#if DEBUG_FRAGS
printf("Tri: %u frags emitted, %u written\n",
setup->numFragsEmitted,
setup->numFragsWritten);
#endif
}
/**
* Render the upper or lower half of a triangle.
* Scissoring/cliprect is applied here too.
*/
static void
subtriangle(struct setup_context *setup,
struct edge *eleft,
struct edge *eright,
int lines,
unsigned viewport_index)
{
const struct pipe_scissor_state *cliprect = &setup->softpipe->cliprect[viewport_index];
const int minx = (int) cliprect->minx;
const int maxx = (int) cliprect->maxx;
const int miny = (int) cliprect->miny;
const int maxy = (int) cliprect->maxy;
int y, start_y, finish_y;
int sy = (int)eleft->sy;
assert((int)eleft->sy == (int) eright->sy);
assert(lines >= 0);
/* clip top/bottom */
start_y = sy;
if (start_y < miny)
start_y = miny;
finish_y = sy + lines;
if (finish_y > maxy)
finish_y = maxy;
start_y -= sy;
finish_y -= sy;
/*
debug_printf("%s %d %d\n", __FUNCTION__, start_y, finish_y);
*/
for (y = start_y; y < finish_y; y++) {
/* avoid accumulating adds as floats don't have the precision to
* accurately iterate large triangle edges that way. luckily we
* can just multiply these days.
*
* this is all drowned out by the attribute interpolation anyway.
*/
int left = (int)(eleft->sx + y * eleft->dxdy);
int right = (int)(eright->sx + y * eright->dxdy);
/* clip left/right */
if (left < minx)
left = minx;
if (right > maxx)
right = maxx;
if (left < right) {
int _y = sy + y;
if (block(_y) != setup->span.y) {
flush_spans(setup);
setup->span.y = block(_y);
}
setup->span.left[_y&1] = left;
setup->span.right[_y&1] = right;
}
}
/* save the values so that emaj can be restarted:
*/
eleft->sx += lines * eleft->dxdy;
eright->sx += lines * eright->dxdy;
eleft->sy += lines;
eright->sy += lines;
}
/**
* Do setup for triangle rasterization, then render the triangle.
*/
void
sp_setup_tri(struct setup_context *setup,
const float (*v0)[4],
const float (*v1)[4],
const float (*v2)[4])
{
float det;
uint layer = 0;
unsigned viewport_index = 0;
#if DEBUG_VERTS
debug_printf("Setup triangle:\n");
print_vertex(setup, v0);
print_vertex(setup, v1);
print_vertex(setup, v2);
#endif
if (setup->softpipe->no_rast || setup->softpipe->rasterizer->rasterizer_discard)
return;
det = calc_det(v0, v1, v2);
/*
debug_printf("%s\n", __FUNCTION__ );
*/
#if DEBUG_FRAGS
setup->numFragsEmitted = 0;
setup->numFragsWritten = 0;
#endif
if (!setup_sort_vertices( setup, det, v0, v1, v2 ))
return;
setup_tri_coefficients( setup );
setup_tri_edges( setup );
assert(setup->softpipe->reduced_prim == PIPE_PRIM_TRIANGLES);
setup->span.y = 0;
setup->span.right[0] = 0;
setup->span.right[1] = 0;
/* setup->span.z_mode = tri_z_mode( setup->ctx ); */
if (setup->softpipe->layer_slot > 0) {
layer = *(unsigned *)setup->vprovoke[setup->softpipe->layer_slot];
layer = MIN2(layer, setup->max_layer);
}
setup->quad[0].input.layer = layer;
if (setup->softpipe->viewport_index_slot > 0) {
unsigned *udata = (unsigned*)v0[setup->softpipe->viewport_index_slot];
viewport_index = sp_clamp_viewport_idx(*udata);
}
setup->quad[0].input.viewport_index = viewport_index;
/* init_constant_attribs( setup ); */
if (setup->oneoverarea < 0.0) {
/* emaj on left:
*/
subtriangle(setup, &setup->emaj, &setup->ebot, setup->ebot.lines, viewport_index);
subtriangle(setup, &setup->emaj, &setup->etop, setup->etop.lines, viewport_index);
}
else {
/* emaj on right:
*/
subtriangle(setup, &setup->ebot, &setup->emaj, setup->ebot.lines, viewport_index);
subtriangle(setup, &setup->etop, &setup->emaj, setup->etop.lines, viewport_index);
}
flush_spans( setup );
if (setup->softpipe->active_statistics_queries) {
setup->softpipe->pipeline_statistics.c_primitives++;
}
#if DEBUG_FRAGS
printf("Tri: %u frags emitted, %u written\n",
setup->numFragsEmitted,
setup->numFragsWritten);
#endif
}
