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
  27 enum {
  28         TBN_NEW, TBN_OPEN, TBN_SAVE, TBN_SEP1,
  29         TBN_SEL, TBN_MOVE, TBN_ROT, TBN_SCALE, TBN_SEP2,
  30         TBN_ADD, TBN_RM, TBN_SEP3,
  31         TBN_UNION, TBN_ISECT, TBN_DIFF, TBN_SEP4,
  32         TBN_MTL, TBN_REND, TBN_VIEWREND, TBN_SEP5, TBN_CFG,
  33
  34         NUM_TOOL_BUTTONS
  35 };
  36 static const char *tbn_icon_name[] = {
  37         "new", "open", "save", 0,
  38         "sel", "move", "rot", "scale", 0,
  39         "add", "remove", 0,
  40         "union", "isect", "diff", 0,
  41         "mtl", "rend", "viewrend", 0, "cfg"
  42 };
  43 static int tbn_icon_pos[][2] = {
  44         {0,0}, {16,0}, {32,0}, {-1,-1},
  45         {48,0}, {64,0}, {80,0}, {96,0}, {-1,-1},
  46         {112,0}, {112,16}, {-1,-1},
  47         {0,16}, {16,16}, {32,16}, {-1,-1},
  48         {48,16}, {64,16}, {80,16}, {-1,-1}, {96,16}
  49 };
  50 static int tbn_istool[] = {
  51         0, 0, 0, 0,
  52         1, 1, 1, 1, 0,
  53         0, 0, 0,
  54         1, 1, 1, 0,
  55         0, 0, 0, 0, 0
  56 };
  57 static rtk_icon *tbn_icons[NUM_TOOL_BUTTONS];
  58 static rtk_widget *tbn_buttons[NUM_TOOL_BUTTONS];
  59
  60 #define TOOLBAR_HEIGHT  26
  61
  62 enum {
  63         TOOL_SEL, TOOL_MOVE, TOOL_ROT, TOOL_SCALE,
  64         TOOL_UNION, TOOL_ISECT, TOOL_DIFF,
  65         NUM_TOOLS
  66 };
  67 static rtk_widget *tools[NUM_TOOLS];
  68
  69
  70 static int mdl_init(void);
  71 static void mdl_destroy(void);
  72 static int mdl_start(void);
  73 static void mdl_stop(void);
  74 static void mdl_display(void);
  75 static void mdl_reshape(int x, int y);
  76 static void mdl_keyb(int key, int press);
  77 static void mdl_mouse(int bn, int press, int x, int y);
  78 static void mdl_motion(int x, int y);
  79
  80 static void draw_object(struct object *obj);
  81 static void draw_grid(void);
  82 static void tbn_callback(rtk_widget *w, void *cls);
  83
  84 static void draw_rband(void);
  85 static void primray(cgm_ray *ray, int x, int y);
  86 static void moveobj(struct object *obj, int px0, int py0, int px1, int py1);
  87
  88
  89 struct app_screen scr_model = {
  90         "modeller",
  91         mdl_init, mdl_destroy,
  92         mdl_start, mdl_stop,
  93         mdl_display, mdl_reshape,
  94         mdl_keyb, mdl_mouse, mdl_motion
  95 };
  96
  97 static rtk_widget *toolbar;
  98 static rtk_iconsheet *icons;
  99
 100 static struct cmesh *mesh_sph;
 101
 102 static float cam_theta, cam_phi = 20, cam_dist = 8;
 103 static float view_matrix[16], proj_matrix[16];
 104 static float view_matrix_inv[16], proj_matrix_inv[16];
 105 static int viewport[4];
 106 static cgm_ray pickray;
 107
 108 static int cur_tool;
 109 static int selobj = -1;
 110
 111 static rtk_rect rband;
 112 static int rband_valid;
 113
 114
 115 static int mdl_init(void)
 116 {
 117         int i, toolidx;
 118         rtk_widget *w;
 119
 120         if(!(icons = rtk_load_iconsheet("data/icons.png"))) {
 121                 errormsg("failed to load iconsheet\n");
 122                 return -1;
 123         }
 124         for(i=0; i<NUM_TOOL_BUTTONS; i++) {
 125                 if(tbn_icon_name[i]) {
 126                         tbn_icons[i] = rtk_define_icon(icons, tbn_icon_name[i],
 127                                         tbn_icon_pos[i][0], tbn_icon_pos[i][1], 16, 16);
 128                 } else {
 129                         tbn_icons[i] = 0;
 130                 }
 131         }
 132
 133         if(!(toolbar = rtk_create_window(0, "toolbar", 0, 0, win_width, TOOLBAR_HEIGHT))) {
 134                 return -1;
 135         }
 136         rtk_win_layout(toolbar, RTK_HBOX);
 137
 138         toolidx = 0;
 139         for(i=0; i<NUM_TOOL_BUTTONS; i++) {
 140                 if(!tbn_icons[i]) {
 141                         rtk_create_separator(toolbar);
 142                 } else {
 143                         if(!(w = rtk_create_iconbutton(toolbar, tbn_icons[i], 0))) {
 144                                 return -1;
 145                         }
 146                         tbn_buttons[i] = w;
 147                         rtk_set_callback(w, tbn_callback, (void*)(intptr_t)i);
 148                         if(tbn_istool[i]) {
 149                                 rtk_bn_mode(w, RTK_TOGGLEBN);
 150                                 tools[toolidx++] = w;
 151                         }
 152                         if(i == TBN_SEL) {
 153                                 rtk_set_value(w, 1);
 154                         }
 155                 }
 156         }
 157         assert(toolidx == NUM_TOOLS);
 158
 159         if(!(mesh_sph = cmesh_alloc())) {
 160                 errormsg("failed to allocate sphere vis mesh\n");
 161                 return -1;
 162         }
 163         gen_sphere(mesh_sph, 1.0f, 16, 8, 1.0f, 1.0f);
 164         return 0;
 165 }
 166
 167 static void mdl_destroy(void)
 168 {
 169         cmesh_free(mesh_sph);
 170         rtk_free_iconsheet(icons);
 171 }
 172
 173 static int mdl_start(void)
 174 {
 175         gaw_clear_color(0.125, 0.125, 0.125, 1);
 176
 177         gaw_enable(GAW_DEPTH_TEST);
 178         gaw_enable(GAW_CULL_FACE);
 179         gaw_enable(GAW_LIGHTING);
 180         gaw_enable(GAW_LIGHT0);
 181         return 0;
 182 }
 183
 184 static void mdl_stop(void)
 185 {
 186 }
 187
 188 static void mdl_display(void)
 189 {
 190         int i, num;
 191
 192         gaw_clear(GAW_COLORBUF | GAW_DEPTHBUF);
 193
 194         rtk_draw_widget(toolbar);
 195
 196         gaw_matrix_mode(GAW_MODELVIEW);
 197         gaw_load_identity();
 198         gaw_translate(0, 0, -cam_dist);
 199         gaw_rotate(cam_phi, 1, 0, 0);
 200         gaw_rotate(cam_theta, 0, 1, 0);
 201         gaw_get_modelview(view_matrix);
 202         cgm_mcopy(view_matrix_inv, view_matrix);
 203         cgm_minverse(view_matrix_inv);
 204
 205         draw_grid();
 206
 207         gaw_mtl_diffuse(0.5, 0.5, 0.5, 1);
 208
 209         num = scn_num_objects(scn);
 210         for(i=0; i<num; i++) {
 211                 if(i == selobj) {
 212                         gaw_zoffset(1);
 213                         gaw_enable(GAW_POLYGON_OFFSET);
 214                         draw_object(scn->objects[i]);
 215                         gaw_disable(GAW_POLYGON_OFFSET);
 216
 217                         gaw_save();
 218                         gaw_disable(GAW_LIGHTING);
 219                         gaw_poly_wire();
 220                         gaw_color3f(0, 1, 0);
 221                         draw_object(scn->objects[i]);
 222                         gaw_poly_gouraud();
 223                         gaw_restore();
 224                 } else {
 225                         draw_object(scn->objects[i]);
 226                 }
 227         }
 228
 229         if(rband_valid) {
 230                 draw_rband();
 231         }
 232 }
 233
 234 static void draw_object(struct object *obj)
 235 {
 236         struct sphere *sph;
 237
 238         if(!obj->xform_valid) {
 239                 calc_object_matrix(obj);
 240         }
 241         gaw_push_matrix();
 242         gaw_mult_matrix(obj->xform);
 243
 244         switch(obj->type) {
 245         case OBJ_SPHERE:
 246                 sph = (struct sphere*)obj;
 247                 gaw_scale(sph->rad, sph->rad, sph->rad);
 248                 cmesh_draw(mesh_sph);
 249                 break;
 250
 251         default:
 252                 break;
 253         }
 254
 255         gaw_pop_matrix();
 256 }
 257
 258 static void draw_grid(void)
 259 {
 260         gaw_save();
 261         gaw_disable(GAW_LIGHTING);
 262
 263         gaw_begin(GAW_LINES);
 264         gaw_color3f(0.5, 0, 0);
 265         gaw_vertex3f(0, 0, 0);
 266         gaw_vertex3f(-100, 0, 0);
 267         gaw_vertex3f(0, 0, 0);
 268         gaw_vertex3f(100, 0, 0);
 269         gaw_color3f(0, 0.5, 0);
 270         gaw_vertex3f(0, 0, 0);
 271         gaw_vertex3f(0, 0, -100);
 272         gaw_vertex3f(0, 0, 0);
 273         gaw_vertex3f(0, 0, 100);
 274         gaw_end();
 275
 276         gaw_restore();
 277 }
 278
 279 static void mdl_reshape(int x, int y)
 280 {
 281         float aspect = (float)x / (float)(y - TOOLBAR_HEIGHT);
 282
 283         viewport[0] = 0;
 284         viewport[1] = TOOLBAR_HEIGHT;
 285         viewport[2] = x;
 286         viewport[3] = y - TOOLBAR_HEIGHT;
 287         gaw_viewport(viewport[0], viewport[1], viewport[2], viewport[3]);
 288
 289         gaw_matrix_mode(GAW_PROJECTION);
 290         gaw_load_identity();
 291         gaw_perspective(50, aspect, 0.5, 100.0);
 292         gaw_get_projection(proj_matrix);
 293         cgm_mcopy(proj_matrix_inv, proj_matrix);
 294         cgm_minverse(proj_matrix_inv);
 295
 296         rtk_resize(toolbar, win_width, TOOLBAR_HEIGHT);
 297 }
 298
 299 static void mdl_keyb(int key, int press)
 300 {
 301         if(rtk_input_key(toolbar, key, press)) {
 302                 app_redisplay();
 303                 return;
 304         }
 305 }
 306
 307 static int vpdrag;
 308
 309 static void mdl_mouse(int bn, int press, int x, int y)
 310 {
 311         struct rayhit hit;
 312         if(!vpdrag && rtk_input_mbutton(toolbar, bn, press, x, y)) {
 313                 app_redisplay();
 314                 return;
 315         }
 316
 317         if(press) {
 318                 rband.x = x;
 319                 rband.y = y;
 320                 vpdrag |= (1 << bn);
 321         } else {
 322                 vpdrag &= ~(1 << bn);
 323
 324                 if(rband_valid) {
 325                         printf("rubber band: %d,%d %dx%d\n", rband.x, rband.y, rband.width, rband.height);
 326                         rband_valid = 0;
 327
 328                 } else if(bn == 0 && x == rband.x && y == rband.y) {
 329                         primray(&pickray, x, y);
 330                         if(scn_intersect(scn, &pickray, &hit)) {
 331                                 selobj = scn_object_index(scn, hit.obj);
 332                         } else {
 333                                 selobj = -1;
 334                         }
 335                 }
 336                 app_redisplay();
 337         }
 338 }
 339
 340 static void mdl_motion(int x, int y)
 341 {
 342         int dx, dy;
 343
 344         if(!vpdrag && rtk_input_mmotion(toolbar, x, y)) {
 345                 app_redisplay();
 346                 return;
 347         }
 348
 349         dx = x - mouse_x;
 350         dy = y - mouse_y;
 351
 352         if(modkeys) {
 353                 /* navigation */
 354                 if(mouse_state[0]) {
 355                         cam_theta += dx * 0.5f;
 356                         cam_phi += dy * 0.5f;
 357                         if(cam_phi < -90) cam_phi = -90;
 358                         if(cam_phi > 90) cam_phi = 90;
 359                         app_redisplay();
 360                 }
 361
 362                 if(mouse_state[2]) {
 363                         cam_dist += dy * 0.1f;
 364                         if(cam_dist < 0) cam_dist = 0;
 365                         app_redisplay();
 366                 }
 367         } else {
 368                 if(mouse_state[0]) {
 369                         switch(cur_tool) {
 370                         case TOOL_SEL:
 371                                 if(rband.x != x || rband.y != y) {
 372                                         rband.width = x - rband.x;
 373                                         rband.height = y - rband.y;
 374                                         rband_valid = 1;
 375                                 }
 376                                 break;
 377
 378                         case TOOL_MOVE:
 379                                 if(selobj >= 0) {
 380                                         struct object *obj = scn->objects[selobj];
 381                                         moveobj(obj, mouse_x, mouse_y, x, y);
 382                                 }
 383                                 break;
 384
 385                         default:
 386                                 break;
 387                         }
 388                 }
 389                 app_redisplay();
 390         }
 391 }
 392
 393 static void add_sphere(void)
 394 {
 395         struct object *obj;
 396
 397         if(!(obj = create_object(OBJ_SPHERE))) {
 398                 return;
 399         }
 400         scn_add_object(scn, obj);
 401 }
 402
 403 static void tbn_callback(rtk_widget *w, void *cls)
 404 {
 405         int i, id = (intptr_t)cls;
 406         int idx;
 407
 408         switch(id) {
 409         case TBN_SEL:
 410         case TBN_MOVE:
 411         case TBN_ROT:
 412         case TBN_SCALE:
 413                 idx = id - TBN_SEL;
 414                 if(0) {
 415         case TBN_UNION:
 416         case TBN_ISECT:
 417         case TBN_DIFF:
 418                         idx = id - TBN_UNION + TOOL_UNION;
 419                 }
 420                 cur_tool = idx;
 421                 for(i=0; i<NUM_TOOLS; i++) {
 422                         if(i != cur_tool) {
 423                                 rtk_set_value(tools[i], 0);
 424                         }
 425                 }
 426                 break;
 427
 428         case TBN_ADD:
 429                 idx = scn_num_objects(scn);
 430                 add_sphere();
 431                 selobj = idx;
 432                 break;
 433
 434         case TBN_RM:
 435                 if(selobj >= 0) {
 436                         scn_rm_object(scn, selobj);
 437                         selobj = -1;
 438                         app_redisplay();
 439                 }
 440                 break;
 441
 442         default:
 443                 break;
 444         }
 445 }
 446
 447 static void draw_rband(void)
 448 {
 449         int i, x, y, w, h;
 450         uint32_t *fbptr, *bptr;
 451
 452         x = rband.x;
 453         y = rband.y;
 454
 455         if(rband.width < 0) {
 456                 w = -rband.width;
 457                 x += rband.width;
 458         } else {
 459                 w = rband.width;
 460         }
 461         if(rband.height < 0) {
 462                 h = -rband.height;
 463                 y += rband.height;
 464         } else {
 465                 h = rband.height;
 466         }
 467
 468         fbptr = framebuf + y * win_width + x;
 469         bptr = fbptr + win_width * (h - 1);
 470
 471         for(i=0; i<w; i++) {
 472                 fbptr[i] ^= 0xffffff;
 473                 bptr[i] ^= 0xffffff;
 474         }
 475         fbptr += win_width;
 476         for(i=0; i<h-2; i++) {
 477                 fbptr[0] ^= 0xffffff;
 478                 fbptr[w - 1] ^= 0xffffff;
 479                 fbptr += win_width;
 480         }
 481 }
 482
 483 static void primray(cgm_ray *ray, int x, int y)
 484 {
 485         float nx, ny;
 486         cgm_vec3 npos, farpt;
 487         float inv_pv[16];
 488
 489         y = win_height - y;
 490         nx = (float)(x - viewport[0]) / (float)viewport[2];
 491         ny = (float)(y - viewport[1]) / (float)viewport[3];
 492
 493         cgm_mcopy(inv_pv, proj_matrix_inv);
 494         cgm_mmul(inv_pv, view_matrix_inv);
 495
 496         cgm_vcons(&npos, nx, ny, 0.0f);
 497         cgm_unproject(&ray->origin, &npos, inv_pv);
 498         npos.z = 1.0f;
 499         cgm_unproject(&farpt, &npos, inv_pv);
 500
 501         ray->dir.x = farpt.x - ray->origin.x;
 502         ray->dir.y = farpt.y - ray->origin.y;
 503         ray->dir.z = farpt.z - ray->origin.z;
 504 }
 505
 506 static void moveobj(struct object *obj, int px0, int py0, int px1, int py1)
 507 {
 508         cgm_ray ray;
 509         float dist;
 510         cgm_vec3 p0, p1;
 511
 512         primray(&ray, px0, py0);
 513         cgm_vnormalize(&ray.dir);
 514         dist = ray_object_dist(&ray, obj);
 515         cgm_raypos(&p0, &ray, dist);
 516         primray(&ray, px1, py1);
 517         cgm_vnormalize(&ray.dir);
 518         cgm_raypos(&p1, &ray, dist);
 519
 520         cgm_vsub(&p1, &p0);
 521         cgm_vadd(&obj->pos, &p1);
 522         obj->xform_valid = 0;
 523 }