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Code Issues Releases Wiki Activity

primitive-based rendering of the Berger sphere (very poor)

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Zeno Rogue
2020-07-24 23:39:30 +02:00
parent 2dff2df4fe
commit 94cac21716
5 changed files with 221 additions and 7 deletions
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84
drawing.cpp
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@@ -1255,6 +1255,80 @@ void draw_s2xe0(dqi_poly *p) {
#endif
EX }
EX int berger_limit = 2;
void draw_stretch(dqi_poly *p) {
if(!(p->flags & POLY_TRIANGLES)) return;
dqi_poly npoly = *p;
npoly.offset = 0;
npoly.tab = &glcoords;
npoly.V = Id;
npoly.flags &= ~(POLY_INVERSE | POLY_FORCE_INVERTED);
transmatrix T2 = stretch::translate( tC0(inverse(View)) );
transmatrix U = View * T2;
transmatrix iUV = inverse(U) * p->V;
vector<hyperpoint> hs;
vector<hyperpoint> ths;
hs.resize(p->cnt);
ths.resize(p->cnt);
for(int i=0; i<p->cnt; i++)
hs[i] = iUV * glhr::gltopoint( (*p->tab)[p->offset+i] );
vector<vector<hyperpoint> > results;
results.resize(p->cnt);
auto& stinf = s2xe::stinf;
if(p->tinf) {
npoly.tinf = &stinf;
npoly.offset_texture = 0;
stinf.texture_id = p->tinf->texture_id;
stinf.tvertices.clear();
}
else {
npoly.tinf = NULL;
}
npoly.V = Id;
set_width(1);
glcoords.clear();
for(int i=0; i<p->cnt; i++) results[i] = stretch::inverse_exp_all(hs[i], berger_limit);
for(int i=0; i<p->cnt; i+=3) {
auto &la = results[i];
auto &lb = results[i+1];
auto &lc = results[i+2];
int ia = 0, ib = 0, ic = 0;
auto test = [] (hyperpoint a, hyperpoint b) -> bool {
return sqhypot_d(3, a-b) < 2;
};
for(auto& ha: la) for(auto& hb: lb) if(test(ha, hb))
for(auto& hc: lc) if(test(ha, hc) && test(hb, hc)) {
glcoords.push_back(glhr::pointtogl(U * ha));
glcoords.push_back(glhr::pointtogl(U * hb));
glcoords.push_back(glhr::pointtogl(U * hc));
if(p->tinf)
for(int j=0; j<3; j++)
stinf.tvertices.push_back(p->tinf->tvertices[p->offset_texture+i+j]);
ia++; ib++; ic++;
}
}
npoly.cnt = isize(glcoords);
npoly.gldraw();
}
EX namespace ods {
#if CAP_ODS
@@ -1522,6 +1596,11 @@ void dqi_poly::draw() {
return;
} */
if(vid.usingGL && (current_display->set_all(global_projection), get_shader_flags() & SF_DIRECT) && sphere && (stretch::factor || ray::in_use)) {
draw_stretch(this);
return;
}
#if CAP_GL
if(vid.usingGL && (current_display->set_all(global_projection), get_shader_flags() & SF_DIRECT)) {
if(sl2 && pmodel == mdGeodesic && hybrid::csteps) {
@@ -1997,14 +2076,11 @@ EX void reverse_transparent_walls() {
EX void draw_main() {
DEBBI(DF_GRAPH, ("draw_main"));
if(sphere && GDIM == 3 && pmodel == mdPerspective) {
if(sphere && GDIM == 3 && pmodel == mdPerspective && !stretch::in() && !ray::in_use) {
if(ray::in_use && !ray::comparison_mode) {
ray::cast();
reset_projection();
/* currently incompatible with primitive-based renderer */
/* also not implemented in stretch */
if(stretch::factor) return;
}
#if CAP_GL