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