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 "geom.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 moveobj(struct object *obj, int px0, int py0, int px1, int py1);
  92
  93
  94 struct app_screen scr_model = {
  95         "modeller",
  96         mdl_init, mdl_destroy,
  97         mdl_start, mdl_stop,
  98         mdl_display, mdl_reshape,
  99         mdl_keyb, mdl_mouse, mdl_motion
 100 };
 101
 102 static rtk_widget *toolbar;
 103 static rtk_iconsheet *icons;
 104
 105 static struct cmesh *mesh_sph;
 106
 107 static float cam_theta, cam_phi = 20, cam_dist = 8;
 108 static float view_matrix[16], proj_matrix[16];
 109 static float view_matrix_inv[16], proj_matrix_inv[16];
 110 static int viewport[4];
 111 static cgm_ray pickray;
 112
 113 static int cur_tool, prev_tool = -1;
 114 static int selobj = -1;
 115
 116 static rtk_rect rband;
 117 static int rband_valid;
 118
 119 static int rendering;
 120
 121
 122 static int mdl_init(void)
 123 {
 124         int i, toolidx;
 125         rtk_widget *w;
 126
 127         if(!(icons = rtk_load_iconsheet("data/icons.png"))) {
 128                 errormsg("failed to load iconsheet\n");
 129                 return -1;
 130         }
 131         for(i=0; i<NUM_TOOL_BUTTONS; i++) {
 132                 if(tbn_icon_name[i]) {
 133                         tbn_icons[i] = rtk_define_icon(icons, tbn_icon_name[i],
 134                                         tbn_icon_pos[i][0], tbn_icon_pos[i][1], 16, 16);
 135                 } else {
 136                         tbn_icons[i] = 0;
 137                 }
 138         }
 139
 140         if(!(toolbar = rtk_create_window(0, "toolbar", 0, 0, win_width, TOOLBAR_HEIGHT))) {
 141                 return -1;
 142         }
 143         rtk_win_layout(toolbar, RTK_HBOX);
 144
 145         toolidx = 0;
 146         for(i=0; i<NUM_TOOL_BUTTONS; i++) {
 147                 if(!tbn_icons[i]) {
 148                         rtk_create_separator(toolbar);
 149                 } else {
 150                         if(!(w = rtk_create_iconbutton(toolbar, tbn_icons[i], 0))) {
 151                                 return -1;
 152                         }
 153                         tbn_buttons[i] = w;
 154                         rtk_set_callback(w, tbn_callback, (void*)(intptr_t)i);
 155                         if(tbn_istool[i]) {
 156                                 rtk_bn_mode(w, RTK_TOGGLEBN);
 157                                 tools[toolidx++] = w;
 158                         }
 159                         if(i == TBN_SEL) {
 160                                 rtk_set_value(w, 1);
 161                         }
 162                 }
 163         }
 164         assert(toolidx == NUM_TOOLS);
 165
 166         if(!(mesh_sph = cmesh_alloc())) {
 167                 errormsg("failed to allocate sphere vis mesh\n");
 168                 return -1;
 169         }
 170         gen_sphere(mesh_sph, 1.0f, 16, 8, 1.0f, 1.0f);
 171         return 0;
 172 }
 173
 174 static void mdl_destroy(void)
 175 {
 176         cmesh_free(mesh_sph);
 177         rtk_free_iconsheet(icons);
 178 }
 179
 180 static int mdl_start(void)
 181 {
 182         gaw_clear_color(0.125, 0.125, 0.125, 1);
 183
 184         gaw_enable(GAW_DEPTH_TEST);
 185         gaw_enable(GAW_CULL_FACE);
 186         gaw_enable(GAW_LIGHTING);
 187         gaw_enable(GAW_LIGHT0);
 188         return 0;
 189 }
 190
 191 static void mdl_stop(void)
 192 {
 193 }
 194
 195 static void mdl_display(void)
 196 {
 197         int i, num;
 198         static int frameno;
 199
 200         gaw_clear(GAW_COLORBUF | GAW_DEPTHBUF);
 201
 202         rtk_draw_widget(toolbar);
 203
 204         gaw_matrix_mode(GAW_MODELVIEW);
 205         gaw_load_identity();
 206         gaw_translate(0, 0, -cam_dist);
 207         gaw_rotate(cam_phi, 1, 0, 0);
 208         gaw_rotate(cam_theta, 0, 1, 0);
 209         gaw_get_modelview(view_matrix);
 210         cgm_mcopy(view_matrix_inv, view_matrix);
 211         cgm_minverse(view_matrix_inv);
 212
 213         draw_grid();
 214
 215         gaw_mtl_diffuse(0.5, 0.5, 0.5, 1);
 216
 217         num = scn_num_objects(scn);
 218         for(i=0; i<num; i++) {
 219                 if(i == selobj) {
 220                         gaw_zoffset(1);
 221                         gaw_enable(GAW_POLYGON_OFFSET);
 222                         draw_object(scn->objects[i]);
 223                         gaw_disable(GAW_POLYGON_OFFSET);
 224
 225                         gaw_save();
 226                         gaw_disable(GAW_LIGHTING);
 227                         gaw_poly_wire();
 228                         gaw_color3f(0, 1, 0);
 229                         draw_object(scn->objects[i]);
 230                         gaw_poly_gouraud();
 231                         gaw_restore();
 232                 } else {
 233                         draw_object(scn->objects[i]);
 234                 }
 235         }
 236
 237         if(rendering) {
 238                 if(render(framebuf)) {
 239                         app_redisplay();
 240                 } else {
 241                         rendering = 0;
 242                 }
 243         }
 244
 245         use_font(uifont);
 246         dtx_position(550, 475);
 247         dtx_color(0.3, 0.3, 0.1, 1);
 248         dtx_printf("update: %ld", frameno++);
 249
 250         if(rband_valid) {
 251                 draw_rband();
 252         }
 253 }
 254
 255 static void draw_object(struct object *obj)
 256 {
 257         struct sphere *sph;
 258
 259         if(!obj->xform_valid) {
 260                 calc_object_matrix(obj);
 261         }
 262         gaw_push_matrix();
 263         gaw_mult_matrix(obj->xform);
 264
 265         switch(obj->type) {
 266         case OBJ_SPHERE:
 267                 sph = (struct sphere*)obj;
 268                 gaw_scale(sph->rad, sph->rad, sph->rad);
 269                 cmesh_draw(mesh_sph);
 270                 break;
 271
 272         default:
 273                 break;
 274         }
 275
 276         gaw_pop_matrix();
 277 }
 278
 279 static void draw_grid(void)
 280 {
 281         gaw_save();
 282         gaw_disable(GAW_LIGHTING);
 283
 284         gaw_begin(GAW_LINES);
 285         gaw_color3f(0.5, 0, 0);
 286         gaw_vertex3f(0, 0, 0);
 287         gaw_vertex3f(-100, 0, 0);
 288         gaw_vertex3f(0, 0, 0);
 289         gaw_vertex3f(100, 0, 0);
 290         gaw_color3f(0, 0.5, 0);
 291         gaw_vertex3f(0, 0, 0);
 292         gaw_vertex3f(0, 0, -100);
 293         gaw_vertex3f(0, 0, 0);
 294         gaw_vertex3f(0, 0, 100);
 295         gaw_end();
 296
 297         gaw_restore();
 298 }
 299
 300 static void mdl_reshape(int x, int y)
 301 {
 302         float aspect = (float)x / (float)(y - TOOLBAR_HEIGHT);
 303
 304         viewport[0] = 0;
 305         viewport[1] = TOOLBAR_HEIGHT;
 306         viewport[2] = x;
 307         viewport[3] = y - TOOLBAR_HEIGHT;
 308         gaw_viewport(viewport[0], viewport[1], viewport[2], viewport[3]);
 309
 310         gaw_matrix_mode(GAW_PROJECTION);
 311         gaw_load_identity();
 312         gaw_perspective(50, aspect, 0.5, 100.0);
 313         gaw_get_projection(proj_matrix);
 314         cgm_mcopy(proj_matrix_inv, proj_matrix);
 315         cgm_minverse(proj_matrix_inv);
 316
 317         rtk_resize(toolbar, win_width, TOOLBAR_HEIGHT);
 318 }
 319
 320 static void mdl_keyb(int key, int press)
 321 {
 322         if(rtk_input_key(toolbar, key, press)) {
 323                 app_redisplay();
 324                 return;
 325         }
 326
 327         if(press) {
 328                 switch(key) {
 329                 case 27:
 330                         act_settool(TOOL_SEL);
 331                         break;
 332                 case 'g':
 333                         act_settool(TOOL_MOVE);
 334                         break;
 335                 case 'r':
 336                         act_settool(TOOL_ROT);
 337                         break;
 338                 case 's':
 339                         act_settool(TOOL_SCALE);
 340                         break;
 341
 342                 case KEY_DEL:
 343                         act_rmobj();
 344                         break;
 345
 346                 default:
 347                         break;
 348                 }
 349         }
 350 }
 351
 352 static int vpdrag;
 353
 354 static void mdl_mouse(int bn, int press, int x, int y)
 355 {
 356         struct rayhit hit;
 357         if(!vpdrag && rtk_input_mbutton(toolbar, bn, press, x, y)) {
 358                 app_redisplay();
 359                 return;
 360         }
 361
 362         if(press) {
 363                 rband_valid = 0;
 364                 rband.x = x;
 365                 rband.y = y;
 366                 vpdrag |= (1 << bn);
 367         } else {
 368                 vpdrag &= ~(1 << bn);
 369
 370                 if(rband_valid) {
 371                         rband_valid = 0;
 372
 373                         if(cur_tool == TOOL_REND_AREA) {
 374                                 if(prev_tool >= 0) {
 375                                         act_settool(prev_tool);
 376                                 }
 377                                 rendering = 1;
 378                                 rend_size(win_width, win_height);
 379                                 rend_begin(rband.x, rband.y, rband.width, rband.height);
 380                         }
 381
 382                 } else if(bn == 0 && x == rband.x && y == rband.y) {
 383                         primray(&pickray, x, y);
 384                         if(scn_intersect(scn, &pickray, &hit)) {
 385                                 selobj = scn_object_index(scn, hit.obj);
 386                         } else {
 387                                 selobj = -1;
 388                         }
 389                 }
 390                 app_redisplay();
 391         }
 392 }
 393
 394 static void mdl_motion(int x, int y)
 395 {
 396         int dx, dy;
 397
 398         if(!vpdrag && rtk_input_mmotion(toolbar, x, y)) {
 399                 app_redisplay();
 400                 return;
 401         }
 402
 403         dx = x - mouse_x;
 404         dy = y - mouse_y;
 405
 406         if(modkeys) {
 407                 /* navigation */
 408                 if(mouse_state[0]) {
 409                         cam_theta += dx * 0.5f;
 410                         cam_phi += dy * 0.5f;
 411                         if(cam_phi < -90) cam_phi = -90;
 412                         if(cam_phi > 90) cam_phi = 90;
 413                         app_redisplay();
 414                 }
 415
 416                 if(mouse_state[2]) {
 417                         cam_dist += dy * 0.1f;
 418                         if(cam_dist < 0) cam_dist = 0;
 419                         app_redisplay();
 420                 }
 421         } else {
 422                 if(mouse_state[0]) {
 423                         switch(cur_tool) {
 424                         case TOOL_SEL:
 425                         case TOOL_REND_AREA:
 426                                 if(rband.x != x || rband.y != y) {
 427                                         rband.width = x - rband.x;
 428                                         rband.height = y - rband.y;
 429                                         rband_valid = 1;
 430                                 }
 431                                 break;
 432
 433                         case TOOL_MOVE:
 434                                 if(selobj >= 0) {
 435                                         struct object *obj = scn->objects[selobj];
 436                                         moveobj(obj, mouse_x, mouse_y, x, y);
 437                                 }
 438                                 break;
 439
 440                         default:
 441                                 break;
 442                         }
 443                         app_redisplay();
 444                 }
 445         }
 446 }
 447
 448 static void add_sphere(void)
 449 {
 450         struct object *obj;
 451
 452         if(!(obj = create_object(OBJ_SPHERE))) {
 453                 return;
 454         }
 455         scn_add_object(scn, obj);
 456 }
 457
 458 static void tbn_callback(rtk_widget *w, void *cls)
 459 {
 460         int id = (intptr_t)cls;
 461
 462         switch(id) {
 463         case TBN_SEL:
 464         case TBN_MOVE:
 465         case TBN_ROT:
 466         case TBN_SCALE:
 467                 act_settool(id - TBN_SEL);
 468                 break;
 469         case TBN_UNION:
 470         case TBN_ISECT:
 471         case TBN_DIFF:
 472                 act_settool(id - TBN_UNION + TOOL_UNION);
 473                 break;
 474         case TBN_REND_AREA:
 475                 act_settool(TOOL_REND_AREA);
 476                 break;
 477
 478         case TBN_ADD:
 479                 act_addobj();
 480                 break;
 481
 482         case TBN_RM:
 483                 act_rmobj();
 484                 break;
 485
 486         default:
 487                 break;
 488         }
 489 }
 490
 491 static void act_settool(int tidx)
 492 {
 493         int i;
 494         prev_tool = cur_tool;
 495         cur_tool = tidx;
 496         for(i=0; i<NUM_TOOLS; i++) {
 497                 if(i == cur_tool) {
 498                         rtk_set_value(tools[i], 1);
 499                 } else {
 500                         rtk_set_value(tools[i], 0);
 501                 }
 502         }
 503         app_redisplay();
 504 }
 505
 506 static void act_addobj(void)
 507 {
 508         int idx = scn_num_objects(scn);
 509         add_sphere();
 510         selobj = idx;
 511
 512         app_redisplay();
 513 }
 514
 515 static void act_rmobj(void)
 516 {
 517         if(selobj >= 0) {
 518                 scn_rm_object(scn, selobj);
 519                 selobj = -1;
 520                 app_redisplay();
 521         }
 522 }
 523
 524 static void draw_rband(void)
 525 {
 526         int i, x, y, w, h;
 527         uint32_t *fbptr, *bptr;
 528
 529         x = rband.x;
 530         y = rband.y;
 531
 532         if(rband.width < 0) {
 533                 w = -rband.width;
 534                 x += rband.width;
 535         } else {
 536                 w = rband.width;
 537         }
 538         if(rband.height < 0) {
 539                 h = -rband.height;
 540                 y += rband.height;
 541         } else {
 542                 h = rband.height;
 543         }
 544
 545         fbptr = framebuf + y * win_width + x;
 546         bptr = fbptr + win_width * (h - 1);
 547
 548         for(i=0; i<w; i++) {
 549                 fbptr[i] ^= 0xffffff;
 550                 bptr[i] ^= 0xffffff;
 551         }
 552         fbptr += win_width;
 553         for(i=0; i<h-2; i++) {
 554                 fbptr[0] ^= 0xffffff;
 555                 fbptr[w - 1] ^= 0xffffff;
 556                 fbptr += win_width;
 557         }
 558 }
 559
 560 void primray(cgm_ray *ray, int x, int y)
 561 {
 562         float nx, ny;
 563         cgm_vec3 npos, farpt;
 564         float inv_pv[16];
 565
 566         y = win_height - y;
 567         nx = (float)(x - viewport[0]) / (float)viewport[2];
 568         ny = (float)(y - viewport[1]) / (float)viewport[3];
 569
 570         cgm_mcopy(inv_pv, proj_matrix_inv);
 571         cgm_mmul(inv_pv, view_matrix_inv);
 572
 573         cgm_vcons(&npos, nx, ny, 0.0f);
 574         cgm_unproject(&ray->origin, &npos, inv_pv);
 575         npos.z = 1.0f;
 576         cgm_unproject(&farpt, &npos, inv_pv);
 577
 578         ray->dir.x = farpt.x - ray->origin.x;
 579         ray->dir.y = farpt.y - ray->origin.y;
 580         ray->dir.z = farpt.z - ray->origin.z;
 581 }
 582
 583 static void moveobj(struct object *obj, int px0, int py0, int px1, int py1)
 584 {
 585         cgm_ray ray;
 586         float dist;
 587         cgm_vec3 p0, p1;
 588
 589         primray(&ray, px0, py0);
 590         cgm_vnormalize(&ray.dir);
 591         dist = ray_object_dist(&ray, obj);
 592         cgm_raypos(&p0, &ray, dist);
 593         primray(&ray, px1, py1);
 594         cgm_vnormalize(&ray.dir);
 595         cgm_raypos(&p1, &ray, dist);
 596
 597         cgm_vsub(&p1, &p0);
 598         cgm_vadd(&obj->pos, &p1);
 599         obj->xform_valid = 0;
 600 }