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semidirect rendering

This commit is contained in:
Zeno Rogue 2023-05-15 02:25:13 +02:00
parent 2e1e14c1a2
commit e6738f6c20
3 changed files with 28 additions and 5 deletions
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10
drawing.cpp
View File

@ -509,7 +509,15 @@ void addpoly(const shiftmatrix& V, const vector<glvertex> &tab, int ofs, int cnt
}
tofix.clear(); knowgood = false;
if(in_perspective()) {
if(poly_flags & POLY_TRIANGLES) {
if(get_shader_flags() & SF_SEMIDIRECT) {
dynamicval<bool> d(computing_semidirect, true);
for(int i=ofs; i<ofs+cnt; i++) {
hyperpoint Hscr;
applymodel(V * glhr::gltopoint(tab[i]), Hscr);
add1(Hscr);
}
}
else if(poly_flags & POLY_TRIANGLES) {
for(int i=ofs; i<ofs+cnt; i+=3) {
shiftpoint h0 = V * glhr::gltopoint(tab[i]);
shiftpoint h1 = V * glhr::gltopoint(tab[i+1]);

16
hypgraph.cpp
View File

@ -378,7 +378,14 @@ EX ld signed_sqrt(ld x) { return x > 0 ? sqrt(x) : -sqrt(-x); }
EX int axial_x, axial_y;
/** in perspective projections, compute inverse_exp (or similar) on CPU, but perspective on GPU (needs consider_shader_projection off) */
EX bool semidirect_rendering = false;
/** flag for semidirect_rendering */
EX bool computing_semidirect = false;
EX void apply_perspective(const hyperpoint& H, hyperpoint& ret) {
if(computing_semidirect) { ret = H; ret[3] = 1; return; }
if(H[2] == 0) { ret[0] = 1e6; ret[1] = 1e6; ret[2] = 0; return; }
ld ratio = vid.xres / current_display->tanfov / current_display->radius / 2;
ret[0] = H[0]/H[2] * ratio;
@ -620,13 +627,14 @@ EX void apply_other_model(shiftpoint H_orig, hyperpoint& ret, eModel md) {
case mdPerspective: {
if(gproduct) H = product::inverse_exp(H);
apply_nil_rotation(H);
H = lp_apply(H);
if(!computing_semidirect) H = lp_apply(H);
apply_perspective(H, ret);
return;
}
case mdGeodesic: {
auto S = lp_apply(inverse_exp(H_orig, pNORMAL | pfNO_DISTANCE));
auto S = inverse_exp(H_orig, pNORMAL | pfNO_DISTANCE);
if(!computing_semidirect) S = lp_apply(S);
apply_perspective(S, ret);
return;
}
@ -645,7 +653,7 @@ EX void apply_other_model(shiftpoint H_orig, hyperpoint& ret, eModel md) {
#if MAXMDIM >= 4
S[3] = 1;
#endif
S = lp_apply(S);
if(!computing_semidirect) S = lp_apply(S);
if(hyperbolic) {
models::apply_orientation(ret[1], ret[0]);
models::apply_orientation_yz(ret[2], ret[1]);
@ -657,7 +665,7 @@ EX void apply_other_model(shiftpoint H_orig, hyperpoint& ret, eModel md) {
#if MAXMDIM >= 4
case mdRelPerspective: {
auto S = rel_log(H_orig, true); S[3] = 1;
S = lp_apply(S);
if(!computing_semidirect) S = lp_apply(S);
apply_perspective(S, ret);
return;
}

7
shaders.cpp
View File

@ -32,6 +32,8 @@ constexpr flagtype SF_ORIENT = 16384;
constexpr flagtype SF_BOX = 32768;
constexpr flagtype SF_ZFOG = 65536;
constexpr flagtype SF_ODSBOX = (1<<17);
constexpr flagtype SF_SEMIDIRECT = (1<<18);
#endif
EX bool solv_all;
@ -236,6 +238,11 @@ shared_ptr<glhr::GLprogram> write_shader(flagtype shader_flags) {
skip_t = true;
shader_flags |= SF_DIRECT;
}
else if(!vid.consider_shader_projection && semidirect_rendering && models::is_perspective(pmodel)) {
vmain += "// this\n";
distfun = "length(t.xyz)";
shader_flags |= SF_PERS3 | SF_SEMIDIRECT;
}
else if(!vid.consider_shader_projection) {
shader_flags |= SF_PIXELS;
}