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https://github.com/zenorogue/hyperrogue.git
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348 lines
10 KiB
C++
348 lines
10 KiB
C++
/* a library for loading 3D models */
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#include "rogueviz.h"
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namespace rogueviz {
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#if CAP_MODELS
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namespace objmodels {
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bool scan(fhstream& hs, char& c) { return fscanf(hs.f, "%c", &c) == 1; }
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char peek(fhstream& fs) {
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char g = fgetc(fs.f);
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ungetc(g, fs.f);
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return g;
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}
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bool model::available() {
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if(av_checked) return is_available;
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av_checked = true;
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is_available = file_exists(path + fname);
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return false;
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}
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string ignore_mtlname = "XXX";
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int debug_objects = 0;
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map<string, texture::texture_data> materials_global;
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texture::texture_data& by_name(string g) {
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if(materials_global.count(g)) return materials_global[g];
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if(debug_objects > 2) println(hlog, "loading texture from: ", g);
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auto& mat = materials_global[g];
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mat.twidth = mat.theight = 0; mat.stretched = true;
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mat.readtexture(g);
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mat.loadTextureGL();
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if(debug_objects > 3) println(hlog, "texture ID: ", mat.textureid);
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return mat;
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}
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void model::load_obj(model_data& md) {
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md.prec_used = prec;
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auto& objects = md.objs;
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fhstream fs(path+fname, "rt");
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if(debug_objects > 0) println(hlog, "loading 3D model from: ", path+fname);
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indenter ind(2);
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if(!fs.f)
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throw hr_exception("failed to open model file: " + path + fname);
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prepare();
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vector<hyperpoint> vertices;
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vector<hyperpoint> normals;
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vector<hyperpoint> tvertices;
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while(!feof(fs.f)) {
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string s;
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scan(fs, s);
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if(s == "#") { scanline(fs); }
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else if(s == "mtllib") {
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string mtllib;
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scan(fs, mtllib);
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fhstream fsm(path+mtllib, "rt");
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if(debug_objects > 1)
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println(hlog, "loading material library from: ", path+mtllib);
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indenter ind(2);
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if(!fsm.f)
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throw hr_exception("failed to open mtllib: " + mtllib);
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color_t nextcol = 0xFFFFFFFF;
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string mtlname, texname = "";
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auto emit_material = [&] {
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if(texname != "" && !materials.count(mtlname))
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materials[mtlname] = by_name(path + texname);
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colors[mtlname] = nextcol;
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if(debug_objects > 2) println(hlog, "color of ", mtlname, " is ", nextcol);
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};
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while(!feof(fsm.f)) {
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string s;
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scan(fsm, s);
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if(s == "#") { scanline(fsm); }
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if(s == "Kd") {
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ld a, b, c;
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scan(fsm, a, b, c);
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nextcol = read_color(a, b, c);
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}
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if(s == "newmtl") {
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emit_material();
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nextcol = 0xFFFFFFFF;
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texname = "";
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mtlname = scanline_noblank(fsm);
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}
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if(s == "map_Kd") {
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texname = scanline_noblank(fsm);
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}
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}
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emit_material();
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}
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else if(s == "o" || s == "g") {
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next_object:
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object *co = nullptr;
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bool textured = false;
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string oname = scanline_noblank(fs);
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if(debug_objects > 2) println(hlog, "reading object: ", oname);
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md.objindex.push_back(isize(md.objs));
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hyperpoint ctr = Hypc;
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int cqty = 0;
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while(true) {
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if(feof(fs.f)) {
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if(co) cgi.finishshape();
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if(co && debug_objects > 4) println(hlog, "vertices = ", co->sh.e-co->sh.s, " tvertices = ", isize(co->tv.tvertices));
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break;
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}
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scan(fs, s);
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if(s == "#") {
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scanline(fs);
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}
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else if(s == "o" || s == "g") {
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if(co) cgi.finishshape();
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if(co && debug_objects > 4) println(hlog, "vertices = ", co->sh.e-co->sh.s, " tvertices = ", isize(co->tv.tvertices));
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goto next_object;
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}
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else if(s == "v") {
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hyperpoint h = C03;
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scan(fs, h[0], h[1], h[2]); // assume all
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h[0] /= 100;
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h[1] /= 100;
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h[2] /= 100;
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vertices.push_back(h);
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ctr += h; cqty++;
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}
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else if(s == "vt") {
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ld u, v;
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scan(fs, u, v);
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tvertices.push_back(point3(u, 1-v, 0));
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}
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else if(s == "vn") {
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hyperpoint hn = C0;
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scan(fs, hn[0], hn[1], hn[2]);
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normals.push_back(hn);
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}
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else if(s == "s") {
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scan(fs, s);
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}
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else if(s == "usemtl") {
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if(co) cgi.finishshape();
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if(co && debug_objects > 4) println(hlog, "vertices = ", co->sh.e-co->sh.s, " tvertices = ", isize(co->tv.tvertices));
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string mtlname = scanline_noblank(fs);
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co = nullptr;
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if(mtlname.find("Layer_Layer0") != string::npos) continue;
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objects.push_back(make_shared<object>());
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co = &*objects.back();
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co->mtlname = mtlname;
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cgi.bshape(co->sh, PPR::WALL);
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cgi.last->flags |= POLY_TRIANGLES;
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cgi.last->texture_offset = 0;
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if(materials.count(mtlname)) {
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textured = true;
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cgi.last->tinf = &co->tv;
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co->tv.texture_id = materials[mtlname].textureid;
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if(debug_objects > 0) println(hlog, "using texture_id : ", co->tv.texture_id);
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co->color = 0xFFFFFFFF;
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}
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else {
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textured = false;
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cgi.last->tinf = &co->tv;
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co->tv.texture_id = floor_textures->renderedTexture;
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if(colors.count(mtlname))
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co->color = colors[mtlname];
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else
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co->color = 0xFFFFFFFF;
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}
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if(mtlname.find(ignore_mtlname) != string::npos) co->color = 0;
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if(debug_objects > 4) println(hlog, "set textured to ", textured, " color ", co->color, " mtlname = '", mtlname, "'");
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}
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else if(s == "f") {
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struct vertexinfo { int f, t, n; };
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array<vertexinfo, 3> vis;
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char bar;
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auto get_vi = [&] (vertexinfo& vi) {
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vi.f = vi.t = vi.n = 1;
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scan(fs, vi.f);
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if(peek(fs) == '/') {
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scan(fs, bar);
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if(peek(fs) != '/') scan(fs, vi.t);
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}
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if(peek(fs) == '/') {
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scan(fs, bar);
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scan(fs, vi.n);
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}
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vi.f--; vi.t--; vi.n--;
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if(vi.f < 0 || vi.f >= isize(vertices))
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throw hr_exception("illegal ID");
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};
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get_vi(vis[0]);
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get_vi(vis[1]);
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next_triangle:
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get_vi(vis[2]);
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vector<hyperpoint> hys;
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vector<hyperpoint> tot;
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for(int i=0; i<3; i++) {
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hys.push_back(vertices[vis[i].f]);
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tot.push_back(textured ? tvertices[vis[i].t] : point3(0,0,0));
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}
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if(!co) continue;
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if(shift_to_ctr) {
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hyperpoint ctr1 = ctr / cqty;
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ctr1[3] = 0;
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if(debug_objects > 5) println(hlog, "ctr1 = ", ctr1, "hys = ", hys[0]);
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for(auto& h: hys)
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h -= ctr1;
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}
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process_triangle(hys, tot, textured, co);
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while(among(peek(fs), ' ', '\r', '\n')) scan(fs, bar);
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if(isdigit(peek(fs))) { vis[1] = vis[2]; goto next_triangle; }
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}
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else if(s == "l") {
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int a, b;
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scan(fs, a, b);
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/* ignore */
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}
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else if(s == "") { }
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else
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throw hr_exception("unknown command: " + s);
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}
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}
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else
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throw("unknown command: " + s);
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}
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if(debug_objects > 0) println(hlog, "reading finished");
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md.objindex.push_back(isize(md.objs));
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cgi.extra_vertices();
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}
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hyperpoint model::transform(hyperpoint h) { return direct_exp(h); }
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int model::subdivision(vector<hyperpoint>& hys) {
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if(euclid) return 1;
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ld maxlen = prec * max(hypot_d(3, hys[1] - hys[0]), max(hypot_d(3, hys[2] - hys[0]), hypot_d(3, hys[2] - hys[1])));
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return int(ceil(maxlen));
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}
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color_t model::read_color(ld a, ld b, ld c) {
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color_t nextcol = 0xFFFFFFFF;
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part(nextcol, 3) = a * 255.99;
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part(nextcol, 2) = b * 255.99;
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part(nextcol, 1) = c * 255.99;
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return nextcol;
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}
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void model::process_triangle(vector<hyperpoint>& hys, vector<hyperpoint>& tot, bool textured, object *co) {
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hyperpoint norm = (hys[1] - hys[0]) ^ (hys[2] - hys[0]);
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norm /= hypot_d(3, norm);
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ld y = .5 + (.2 * norm[0] + .16 * norm[1] + .14 * norm[2]);
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glvertex shade = glhr::makevertex(0, y, 0);
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glvertex shadecol = glhr::makevertex(y, y, y);
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int parts = subdivision(hys);
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auto tri = [&] (int a, int b) {
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cgi.hpcpush(transform(hys[0] + (hys[1] - hys[0]) * a / parts + (hys[2] - hys[0]) * b / parts));
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// cgi.hpcpush(tf(tot[0] + (tot[1] - tot[0]) * a / parts + (tot[2] - tot[0]) * b / parts).second);
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if(textured) {
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co->tv.tvertices.push_back(glhr::pointtogl(tot[0] + (tot[1] - tot[0]) * a / parts + (tot[2] - tot[0]) * b / parts));
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co->tv.colors.push_back(shadecol);
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}
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else {
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co->tv.tvertices.push_back(shade);
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}
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};
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for(int a=0; a<parts; a++)
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for(int b=0; b<parts-a; b++) {
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tri(a, b);
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tri(a+1, b);
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tri(a, b+1);
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if(a+b < parts-1) {
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tri(a, b+1);
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tri(a+1, b);
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tri(a+1, b+1);
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}
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}
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}
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model_data& model::get() {
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auto& md = (unique_ptr<model_data>&) cgi.ext[fname];
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if(!md) {
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md = std::make_unique<model_data>();
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load_obj(*md);
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}
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if(md && md->prec_used < prec) {
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if(debug_objects > 0) println(hlog, "need prec=", prec, " used = ", md->prec_used);
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md->objs.clear();
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load_obj(*md);
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}
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return *md;
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}
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void model_data::render(const shiftmatrix& V) {
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for(auto& obj: objs) if(obj->color) {
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queuepoly(V, obj->sh, obj->color);
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}
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}
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void model_settings() {
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emptyscreen();
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dialog::init();
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add_edit(prec);
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dialog::addBack();
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dialog::display();
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}
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void o_key(o_funcs& v) {
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v.push_back(named_dialog("set model settings", model_settings));
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}
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void add_model_settings() {
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rogueviz::rv_hook(hooks_o_key, 200, o_key);
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}
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auto cf = addHook(hooks_configfile, 100, [] {
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param_f(prec, "obj_prec")
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->editable(1, 100, 1, "3D model precision", "higher-precision models take more time to load and to render.", 'p')
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->set_sets([] { cmode = sm::NOSCR; })
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;
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param_b(shift_to_ctr, "shift_to_ctr");
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}) + arg::add2("-debobj", [] { arg::shift(); debug_objects = arg::argi(); });
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}
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#endif
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}
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