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drawing:: broken_projection as a separate function

This commit is contained in:
Zeno Rogue 2020-09-16 13:51:21 +02:00
parent f7a3a80f85
commit 5f33d6b51b
1 changed files with 78 additions and 67 deletions
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145
drawing.cpp
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@ -1501,8 +1501,85 @@ EX namespace ods {
#endif
EX }
/** @brief render in a broken projection; return false if normal rendering is not applicable */
bool broken_projection(dqi_poly& p0) {
int broken_coord = models::get_broken_coord(pmodel);
static bool in_broken = false;
if(broken_coord && !in_broken) {
int zcoord = broken_coord;
int ycoord = 3 - zcoord;
vector<hyperpoint> all;
for(int i=0; i<p0.cnt; i++)
all.push_back(p0.V.T * glhr::gltopoint((*p0.tab)[p0.offset+i]));
int fail = 0;
int last_fail;
auto break_in = [&] (hyperpoint a, hyperpoint b) {
return a[0] * b[0] <= 0 && (a[0] * b[zcoord] - b[0] * a[zcoord]) * (a[0] - b[0]) < 0;
};
for(int i=0; i<p0.cnt-1; i++)
if(break_in(all[i], all[i+1]))
last_fail = i, fail++;
vector<glvertex> v;
dqi_poly p = p0;
p.tab = &v;
p.offset = 0;
p.V.T = Id;
if(fail) {
dynamicval<bool> ib(in_broken, true);
ld part = ilerp(all[last_fail][0], all[last_fail+1][0], 0);
hyperpoint initial = normalize(lerp(all[last_fail], all[last_fail+1], 1 - (1-part) * .99));
bool have_initial = true;
v.push_back(glhr::pointtogl(initial));
last_fail++;
int at = last_fail;
do {
v.push_back(glhr::pointtogl(all[at]));
if(at == p0.cnt-1 && all[at] != all[0]) {
p.cnt = isize(v); p.draw(); v.clear(); at = 0;
have_initial = false;
}
int next = at+1;
if(next == p0.cnt) next = 0;
if(break_in(all[at], all[next])) {
ld part = ilerp(all[at][0], all[next][0], 0);
hyperpoint final = normalize(lerp(all[at], all[next], part * .99));
v.push_back(glhr::pointtogl(final));
if(have_initial) {
int max = 4 << vid.linequality;
if(final[0] * initial[0] > 0) {
for(int i=1; i<=max; i++)
v.push_back(glhr::pointtogl(lerp(final, initial, i * 1. / max)));
}
else {
hyperpoint end = Hypc;
end[ycoord] = final[ycoord] > 0 ? 1 : -1;
for(int i=1; i<=max; i++)
v.push_back(glhr::pointtogl(lerp(final, end, i * 1. / max)));
for(int i=1; i<=max; i++)
v.push_back(glhr::pointtogl(lerp(end, initial, i * 1. / max)));
}
}
p.cnt = isize(v); p.draw(); v.clear();
initial = normalize(lerp(all[at], all[next], 1 - (1-part) * .99));
have_initial = true;
v.push_back(glhr::pointtogl(initial));
}
at = next;
}
while(at != last_fail);
return true;
}
}
return false;
}
void dqi_poly::draw() {
if(flags & POLY_DEBUG) debug_this();
if(debugflags & DF_VERTEX) {
println(hlog, tie(V, offset, cnt, offset_texture, outline, linewidth, flags, intester, cache), (cell*) tinf);
for(int i=0; i<cnt; i++) print(hlog, (*tab)[i]);
@ -1546,73 +1623,7 @@ void dqi_poly::draw() {
return;
}
int broken_coord = models::get_broken_coord(pmodel);
static bool in_broken = false;
if(broken_coord && !in_broken) {
int zcoord = broken_coord;
int ycoord = 3 - zcoord;
vector<hyperpoint> all;
for(int i=0; i<cnt; i++)
all.push_back(V.T * glhr::gltopoint((*tab)[offset+i]));
int fail = 0;
int last_fail;
for(int i=0; i<cnt-1; i++)
if(all[i][0] * all[i+1][0] <= 0 && (all[i][0] * all[i+1][zcoord] - all[i+1][0] * all[i][zcoord]) * (all[i][0] - all[i+1][0]) < 0)
last_fail = i, fail++;
vector<glvertex> v;
dqi_poly p = *this;
p.tab = &v;
p.offset = 0;
p.V.T = Id;
if(fail) {
dynamicval<bool> ib(in_broken, true);
ld part = ilerp(all[last_fail][0], all[last_fail+1][0], 0);
hyperpoint initial = normalize(lerp(all[last_fail], all[last_fail+1], 1 - (1-part) * .99));
bool have_initial = true;
v.push_back(glhr::pointtogl(initial));
last_fail++;
int at = last_fail;
do {
v.push_back(glhr::pointtogl(all[at]));
if(at == cnt-1 && all[at] != all[0]) {
p.cnt = isize(v); p.draw(); v.clear(); at = 0;
have_initial = false;
}
int next = at+1;
if(next == cnt) next = 0;
if(all[at][0] * all[next][0] <= 0 && (all[at][0] * all[next][zcoord] - all[next][0] * all[at][zcoord]) * (all[at][0] - all[next][0]) < 0) {
ld part = ilerp(all[at][0], all[next][0], 0);
if(part > .999 || part < .001) { in_broken = false; return; }
hyperpoint final = normalize(lerp(all[at], all[next], part * .99));
v.push_back(glhr::pointtogl(final));
if(have_initial) {
int max = 4 << vid.linequality;
if(final[0] * initial[0] > 0) {
for(int i=1; i<=max; i++)
v.push_back(glhr::pointtogl(lerp(final, initial, i * 1. / max)));
}
else {
hyperpoint end = Hypc;
end[ycoord] = final[ycoord] > 0 ? 1 : -1;
for(int i=1; i<=max; i++)
v.push_back(glhr::pointtogl(lerp(final, end, i * 1. / max)));
for(int i=1; i<=max; i++)
v.push_back(glhr::pointtogl(lerp(end, initial, i * 1. / max)));
}
}
p.cnt = isize(v); p.draw(); v.clear();
initial = normalize(lerp(all[at], all[next], 1 - (1-part) * .99));
have_initial = true;
v.push_back(glhr::pointtogl(initial));
}
at = next;
}
while(at != last_fail);
return;
}
}
if(broken_projection(*this)) return;
if(sphere && pmodel == mdTwoPoint && !in_twopoint) {
#define MAX_PHASE 4