git.mutantstargoat.com Git - retroray/blob - src/scr_mod.c

   1 /*
   2 RetroRay - integrated standalone vintage modeller/renderer
   3 Copyright (C) 2023  John Tsiombikas <nuclear@mutantstargoat.com>
   4
   5 This program is free software: you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation, either version 3 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program.  If not, see <https://www.gnu.org/licenses/>.
  17 */
  18 #include <assert.h>
  19 #include "gaw/gaw.h"
  20 #include "app.h"
  21 #include "rtk.h"
  22 #include "scene.h"
  23 #include "rt.h"
  24 #include "cmesh.h"
  25 #include "meshgen.h"
  26 #include "font.h"
  27 #include "rend.h"
  28
  29 enum {
  30         TBN_NEW, TBN_OPEN, TBN_SAVE, TBN_SEP1,
  31         TBN_SEL, TBN_MOVE, TBN_ROT, TBN_SCALE, TBN_SEP2,
  32         TBN_ADD, TBN_RM, TBN_SEP3,
  33         TBN_UNION, TBN_ISECT, TBN_DIFF, TBN_SEP4,
  34         TBN_MTL, TBN_REND, TBN_REND_AREA, TBN_VIEWREND, TBN_SEP5, TBN_CFG,
  35
  36         NUM_TOOL_BUTTONS
  37 };
  38 static const char *tbn_icon_name[] = {
  39         "new", "open", "save", 0,
  40         "sel", "move", "rot", "scale", 0,
  41         "add", "remove", 0,
  42         "union", "isect", "diff", 0,
  43         "mtl", "rend", "rend-area", "viewrend", 0, "cfg"
  44 };
  45 static int tbn_icon_pos[][2] = {
  46         {0,0}, {16,0}, {32,0}, {-1,-1},
  47         {48,0}, {64,0}, {80,0}, {96,0}, {-1,-1},
  48         {112,0}, {112,16}, {-1,-1},
  49         {0,16}, {16,16}, {32,16}, {-1,-1},
  50         {48,16}, {64,16}, {64, 32}, {80,16}, {-1,-1}, {96,16}
  51 };
  52 static int tbn_istool[] = {
  53         0, 0, 0, 0,
  54         1, 1, 1, 1, 0,
  55         0, 0, 0,
  56         1, 1, 1, 0,
  57         0, 0, 1, 0, 0, 0
  58 };
  59 static rtk_icon *tbn_icons[NUM_TOOL_BUTTONS];
  60 static rtk_widget *tbn_buttons[NUM_TOOL_BUTTONS];
  61
  62 #define TOOLBAR_HEIGHT  26
  63
  64 enum {
  65         TOOL_SEL, TOOL_MOVE, TOOL_ROT, TOOL_SCALE,
  66         TOOL_UNION, TOOL_ISECT, TOOL_DIFF, TOOL_REND_AREA,
  67         NUM_TOOLS
  68 };
  69 static rtk_widget *tools[NUM_TOOLS];
  70
  71
  72 static int mdl_init(void);
  73 static void mdl_destroy(void);
  74 static int mdl_start(void);
  75 static void mdl_stop(void);
  76 static void mdl_display(void);
  77 static void mdl_reshape(int x, int y);
  78 static void mdl_keyb(int key, int press);
  79 static void mdl_mouse(int bn, int press, int x, int y);
  80 static void mdl_motion(int x, int y);
  81
  82 static void draw_object(struct object *obj);
  83 static void draw_grid(void);
  84 static void tbn_callback(rtk_widget *w, void *cls);
  85
  86 static void act_settool(int tidx);
  87 static void act_addobj(void);
  88 static void act_rmobj(void);
  89
  90 static void draw_rband(void);
  91 static void primray(cgm_ray *ray, int x, int y);
  92 static void moveobj(struct object *obj, int px0, int py0, int px1, int py1);
  93
  94
  95 struct app_screen scr_model = {
  96         "modeller",
  97         mdl_init, mdl_destroy,
  98         mdl_start, mdl_stop,
  99         mdl_display, mdl_reshape,
 100         mdl_keyb, mdl_mouse, mdl_motion
 101 };
 102
 103 static rtk_widget *toolbar;
 104 static rtk_iconsheet *icons;
 105
 106 static struct cmesh *mesh_sph;
 107
 108 static float cam_theta, cam_phi = 20, cam_dist = 8;
 109 static float view_matrix[16], proj_matrix[16];
 110 static float view_matrix_inv[16], proj_matrix_inv[16];
 111 static int viewport[4];
 112 static cgm_ray pickray;
 113
 114 static int cur_tool, prev_tool = -1;
 115 static int selobj = -1;
 116
 117 static rtk_rect rband;
 118 static int rband_valid;
 119
 120 static int rendering;
 121
 122
 123 static int mdl_init(void)
 124 {
 125         int i, toolidx;
 126         rtk_widget *w;
 127
 128         if(!(icons = rtk_load_iconsheet("data/icons.png"))) {
 129                 errormsg("failed to load iconsheet\n");
 130                 return -1;
 131         }
 132         for(i=0; i<NUM_TOOL_BUTTONS; i++) {
 133                 if(tbn_icon_name[i]) {
 134                         tbn_icons[i] = rtk_define_icon(icons, tbn_icon_name[i],
 135                                         tbn_icon_pos[i][0], tbn_icon_pos[i][1], 16, 16);
 136                 } else {
 137                         tbn_icons[i] = 0;
 138                 }
 139         }
 140
 141         if(!(toolbar = rtk_create_window(0, "toolbar", 0, 0, win_width, TOOLBAR_HEIGHT))) {
 142                 return -1;
 143         }
 144         rtk_win_layout(toolbar, RTK_HBOX);
 145
 146         toolidx = 0;
 147         for(i=0; i<NUM_TOOL_BUTTONS; i++) {
 148                 if(!tbn_icons[i]) {
 149                         rtk_create_separator(toolbar);
 150                 } else {
 151                         if(!(w = rtk_create_iconbutton(toolbar, tbn_icons[i], 0))) {
 152                                 return -1;
 153                         }
 154                         tbn_buttons[i] = w;
 155                         rtk_set_callback(w, tbn_callback, (void*)(intptr_t)i);
 156                         if(tbn_istool[i]) {
 157                                 rtk_bn_mode(w, RTK_TOGGLEBN);
 158                                 tools[toolidx++] = w;
 159                         }
 160                         if(i == TBN_SEL) {
 161                                 rtk_set_value(w, 1);
 162                         }
 163                 }
 164         }
 165         assert(toolidx == NUM_TOOLS);
 166
 167         if(!(mesh_sph = cmesh_alloc())) {
 168                 errormsg("failed to allocate sphere vis mesh\n");
 169                 return -1;
 170         }
 171         gen_sphere(mesh_sph, 1.0f, 16, 8, 1.0f, 1.0f);
 172         return 0;
 173 }
 174
 175 static void mdl_destroy(void)
 176 {
 177         cmesh_free(mesh_sph);
 178         rtk_free_iconsheet(icons);
 179 }
 180
 181 static int mdl_start(void)
 182 {
 183         gaw_clear_color(0.125, 0.125, 0.125, 1);
 184
 185         gaw_enable(GAW_DEPTH_TEST);
 186         gaw_enable(GAW_CULL_FACE);
 187         gaw_enable(GAW_LIGHTING);
 188         gaw_enable(GAW_LIGHT0);
 189         return 0;
 190 }
 191
 192 static void mdl_stop(void)
 193 {
 194 }
 195
 196 static void mdl_display(void)
 197 {
 198         int i, num;
 199         static int frameno;
 200
 201         gaw_clear(GAW_COLORBUF | GAW_DEPTHBUF);
 202
 203         rtk_draw_widget(toolbar);
 204
 205         gaw_matrix_mode(GAW_MODELVIEW);
 206         gaw_load_identity();
 207         gaw_translate(0, 0, -cam_dist);
 208         gaw_rotate(cam_phi, 1, 0, 0);
 209         gaw_rotate(cam_theta, 0, 1, 0);
 210         gaw_get_modelview(view_matrix);
 211         cgm_mcopy(view_matrix_inv, view_matrix);
 212         cgm_minverse(view_matrix_inv);
 213
 214         draw_grid();
 215
 216         gaw_mtl_diffuse(0.5, 0.5, 0.5, 1);
 217
 218         num = scn_num_objects(scn);
 219         for(i=0; i<num; i++) {
 220                 if(i == selobj) {
 221                         gaw_zoffset(1);
 222                         gaw_enable(GAW_POLYGON_OFFSET);
 223                         draw_object(scn->objects[i]);
 224                         gaw_disable(GAW_POLYGON_OFFSET);
 225
 226                         gaw_save();
 227                         gaw_disable(GAW_LIGHTING);
 228                         gaw_poly_wire();
 229                         gaw_color3f(0, 1, 0);
 230                         draw_object(scn->objects[i]);
 231                         gaw_poly_gouraud();
 232                         gaw_restore();
 233                 } else {
 234                         draw_object(scn->objects[i]);
 235                 }
 236         }
 237
 238         if(rendering) {
 239                 if(render(framebuf)) {
 240                         app_redisplay();
 241                 } else {
 242                         rendering = 0;
 243                 }
 244         }
 245
 246         use_font(uifont);
 247         dtx_position(550, 475);
 248         dtx_color(0.3, 0.3, 0.1, 1);
 249         dtx_printf("update: %ld", frameno++);
 250
 251         if(rband_valid) {
 252                 draw_rband();
 253         }
 254 }
 255
 256 static void draw_object(struct object *obj)
 257 {
 258         struct sphere *sph;
 259
 260         if(!obj->xform_valid) {
 261                 calc_object_matrix(obj);
 262         }
 263         gaw_push_matrix();
 264         gaw_mult_matrix(obj->xform);
 265
 266         switch(obj->type) {
 267         case OBJ_SPHERE:
 268                 sph = (struct sphere*)obj;
 269                 gaw_scale(sph->rad, sph->rad, sph->rad);
 270                 cmesh_draw(mesh_sph);
 271                 break;
 272
 273         default:
 274                 break;
 275         }
 276
 277         gaw_pop_matrix();
 278 }
 279
 280 static void draw_grid(void)
 281 {
 282         gaw_save();
 283         gaw_disable(GAW_LIGHTING);
 284
 285         gaw_begin(GAW_LINES);
 286         gaw_color3f(0.5, 0, 0);
 287         gaw_vertex3f(0, 0, 0);
 288         gaw_vertex3f(-100, 0, 0);
 289         gaw_vertex3f(0, 0, 0);
 290         gaw_vertex3f(100, 0, 0);
 291         gaw_color3f(0, 0.5, 0);
 292         gaw_vertex3f(0, 0, 0);
 293         gaw_vertex3f(0, 0, -100);
 294         gaw_vertex3f(0, 0, 0);
 295         gaw_vertex3f(0, 0, 100);
 296         gaw_end();
 297
 298         gaw_restore();
 299 }
 300
 301 static void mdl_reshape(int x, int y)
 302 {
 303         float aspect = (float)x / (float)(y - TOOLBAR_HEIGHT);
 304
 305         viewport[0] = 0;
 306         viewport[1] = TOOLBAR_HEIGHT;
 307         viewport[2] = x;
 308         viewport[3] = y - TOOLBAR_HEIGHT;
 309         gaw_viewport(viewport[0], viewport[1], viewport[2], viewport[3]);
 310
 311         gaw_matrix_mode(GAW_PROJECTION);
 312         gaw_load_identity();
 313         gaw_perspective(50, aspect, 0.5, 100.0);
 314         gaw_get_projection(proj_matrix);
 315         cgm_mcopy(proj_matrix_inv, proj_matrix);
 316         cgm_minverse(proj_matrix_inv);
 317
 318         rtk_resize(toolbar, win_width, TOOLBAR_HEIGHT);
 319 }
 320
 321 static void mdl_keyb(int key, int press)
 322 {
 323         if(rtk_input_key(toolbar, key, press)) {
 324                 app_redisplay();
 325                 return;
 326         }
 327
 328         if(press) {
 329                 switch(key) {
 330                 case 27:
 331                         act_settool(TOOL_SEL);
 332                         break;
 333                 case 'g':
 334                         act_settool(TOOL_MOVE);
 335                         break;
 336                 case 'r':
 337                         act_settool(TOOL_ROT);
 338                         break;
 339                 case 's':
 340                         act_settool(TOOL_SCALE);
 341                         break;
 342
 343                 case KEY_DEL:
 344                         act_rmobj();
 345                         break;
 346
 347                 default:
 348                         break;
 349                 }
 350         }
 351 }
 352
 353 static int vpdrag;
 354
 355 static void mdl_mouse(int bn, int press, int x, int y)
 356 {
 357         struct rayhit hit;
 358         if(!vpdrag && rtk_input_mbutton(toolbar, bn, press, x, y)) {
 359                 app_redisplay();
 360                 return;
 361         }
 362
 363         if(press) {
 364                 rband_valid = 0;
 365                 rband.x = x;
 366                 rband.y = y;
 367                 vpdrag |= (1 << bn);
 368         } else {
 369                 vpdrag &= ~(1 << bn);
 370
 371                 if(rband_valid) {
 372                         rband_valid = 0;
 373
 374                         if(cur_tool == TOOL_REND_AREA) {
 375                                 if(prev_tool >= 0) {
 376                                         act_settool(prev_tool);
 377                                 }
 378                                 rendering = 1;
 379                                 rend_size(win_width, win_height);
 380                                 rend_begin(rband.x, rband.y, rband.width, rband.height);
 381                         }
 382
 383                 } else if(bn == 0 && x == rband.x && y == rband.y) {
 384                         primray(&pickray, x, y);
 385                         if(scn_intersect(scn, &pickray, &hit)) {
 386                                 selobj = scn_object_index(scn, hit.obj);
 387                         } else {
 388                                 selobj = -1;
 389                         }
 390                 }
 391                 app_redisplay();
 392         }
 393 }
 394
 395 static void mdl_motion(int x, int y)
 396 {
 397         int dx, dy;
 398
 399         if(!vpdrag && rtk_input_mmotion(toolbar, x, y)) {
 400                 app_redisplay();
 401                 return;
 402         }
 403
 404         dx = x - mouse_x;
 405         dy = y - mouse_y;
 406
 407         if(modkeys) {
 408                 /* navigation */
 409                 if(mouse_state[0]) {
 410                         cam_theta += dx * 0.5f;
 411                         cam_phi += dy * 0.5f;
 412                         if(cam_phi < -90) cam_phi = -90;
 413                         if(cam_phi > 90) cam_phi = 90;
 414                         app_redisplay();
 415                 }
 416
 417                 if(mouse_state[2]) {
 418                         cam_dist += dy * 0.1f;
 419                         if(cam_dist < 0) cam_dist = 0;
 420                         app_redisplay();
 421                 }
 422         } else {
 423                 if(mouse_state[0]) {
 424                         switch(cur_tool) {
 425                         case TOOL_SEL:
 426                         case TOOL_REND_AREA:
 427                                 if(rband.x != x || rband.y != y) {
 428                                         rband.width = x - rband.x;
 429                                         rband.height = y - rband.y;
 430                                         rband_valid = 1;
 431                                 }
 432                                 break;
 433
 434                         case TOOL_MOVE:
 435                                 if(selobj >= 0) {
 436                                         struct object *obj = scn->objects[selobj];
 437                                         moveobj(obj, mouse_x, mouse_y, x, y);
 438                                 }
 439                                 break;
 440
 441                         default:
 442                                 break;
 443                         }
 444                         app_redisplay();
 445                 }
 446         }
 447 }
 448
 449 static void add_sphere(void)
 450 {
 451         struct object *obj;
 452
 453         if(!(obj = create_object(OBJ_SPHERE))) {
 454                 return;
 455         }
 456         scn_add_object(scn, obj);
 457 }
 458
 459 static void tbn_callback(rtk_widget *w, void *cls)
 460 {
 461         int id = (intptr_t)cls;
 462
 463         switch(id) {
 464         case TBN_SEL:
 465         case TBN_MOVE:
 466         case TBN_ROT:
 467         case TBN_SCALE:
 468                 act_settool(id - TBN_SEL);
 469                 break;
 470         case TBN_UNION:
 471         case TBN_ISECT:
 472         case TBN_DIFF:
 473                 act_settool(id - TBN_UNION + TOOL_UNION);
 474                 break;
 475         case TBN_REND_AREA:
 476                 act_settool(TOOL_REND_AREA);
 477                 break;
 478
 479         case TBN_ADD:
 480                 act_addobj();
 481                 break;
 482
 483         case TBN_RM:
 484                 act_rmobj();
 485                 break;
 486
 487         default:
 488                 break;
 489         }
 490 }
 491
 492 static void act_settool(int tidx)
 493 {
 494         int i;
 495         prev_tool = cur_tool;
 496         cur_tool = tidx;
 497         for(i=0; i<NUM_TOOLS; i++) {
 498                 if(i == cur_tool) {
 499                         rtk_set_value(tools[i], 1);
 500                 } else {
 501                         rtk_set_value(tools[i], 0);
 502                 }
 503         }
 504         app_redisplay();
 505 }
 506
 507 static void act_addobj(void)
 508 {
 509         int idx = scn_num_objects(scn);
 510         add_sphere();
 511         selobj = idx;
 512
 513         app_redisplay();
 514 }
 515
 516 static void act_rmobj(void)
 517 {
 518         if(selobj >= 0) {
 519                 scn_rm_object(scn, selobj);
 520                 selobj = -1;
 521                 app_redisplay();
 522         }
 523 }
 524
 525 static void draw_rband(void)
 526 {
 527         int i, x, y, w, h;
 528         uint32_t *fbptr, *bptr;
 529
 530         x = rband.x;
 531         y = rband.y;
 532
 533         if(rband.width < 0) {
 534                 w = -rband.width;
 535                 x += rband.width;
 536         } else {
 537                 w = rband.width;
 538         }
 539         if(rband.height < 0) {
 540                 h = -rband.height;
 541                 y += rband.height;
 542         } else {
 543                 h = rband.height;
 544         }
 545
 546         fbptr = framebuf + y * win_width + x;
 547         bptr = fbptr + win_width * (h - 1);
 548
 549         for(i=0; i<w; i++) {
 550                 fbptr[i] ^= 0xffffff;
 551                 bptr[i] ^= 0xffffff;
 552         }
 553         fbptr += win_width;
 554         for(i=0; i<h-2; i++) {
 555                 fbptr[0] ^= 0xffffff;
 556                 fbptr[w - 1] ^= 0xffffff;
 557                 fbptr += win_width;
 558         }
 559 }
 560
 561 static void primray(cgm_ray *ray, int x, int y)
 562 {
 563         float nx, ny;
 564         cgm_vec3 npos, farpt;
 565         float inv_pv[16];
 566
 567         y = win_height - y;
 568         nx = (float)(x - viewport[0]) / (float)viewport[2];
 569         ny = (float)(y - viewport[1]) / (float)viewport[3];
 570
 571         cgm_mcopy(inv_pv, proj_matrix_inv);
 572         cgm_mmul(inv_pv, view_matrix_inv);
 573
 574         cgm_vcons(&npos, nx, ny, 0.0f);
 575         cgm_unproject(&ray->origin, &npos, inv_pv);
 576         npos.z = 1.0f;
 577         cgm_unproject(&farpt, &npos, inv_pv);
 578
 579         ray->dir.x = farpt.x - ray->origin.x;
 580         ray->dir.y = farpt.y - ray->origin.y;
 581         ray->dir.z = farpt.z - ray->origin.z;
 582 }
 583
 584 static void moveobj(struct object *obj, int px0, int py0, int px1, int py1)
 585 {
 586         cgm_ray ray;
 587         float dist;
 588         cgm_vec3 p0, p1;
 589
 590         primray(&ray, px0, py0);
 591         cgm_vnormalize(&ray.dir);
 592         dist = ray_object_dist(&ray, obj);
 593         cgm_raypos(&p0, &ray, dist);
 594         primray(&ray, px1, py1);
 595         cgm_vnormalize(&ray.dir);
 596         cgm_raypos(&p1, &ray, dist);
 597
 598         cgm_vsub(&p1, &p0);
 599         cgm_vadd(&obj->pos, &p1);
 600         obj->xform_valid = 0;
 601 }