graphics.c

   1
   2 /**
   3  *
   4  * Tennix! SDL Port
   5  * Copyright (C) 2003, 2007, 2008 Thomas Perl <thp@perli.net>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version 2
  10  * of the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  20  * MA  02110-1301, USA.
  21  *
  22  **/
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <math.h>
  27
  28 #include "tennix.h"
  29 #include "graphics.h"
  30
  31 static Image* images;
  32
  33 static SDL_Surface *buffer;
  34 static SDL_Surface *background;
  35
  36 static SDL_Rect *rect_update_cache;
  37 static SDL_Rect *rect_update_old;
  38 static int rect_update_cache_current;
  39 static int rect_update_old_count;
  40
  41 static Uint32 fading_start = 0;
  42
  43 #include "data/graphics_data.c"
  44 static const ResourceData graphics[] = {
  45     RESOURCE(court),
  46     RESOURCE(shadow),
  47     RESOURCE(player_racket),
  48     RESOURCE(ball),
  49     RESOURCE(smallish_font),
  50     RESOURCE(dkc2),
  51     RESOURCE(referee),
  52     RESOURCE(ctt_hard),
  53     RESOURCE(ctt_clay),
  54     RESOURCE(ctt_grass),
  55     RESOURCE(sidebar),
  56     RESOURCE(tennixlogo),
  57     RESOURCE(btnplay),
  58     RESOURCE(btnresume),
  59     RESOURCE(btnquit)
  60 };
  61
  62 void init_graphics() {
  63     int i;
  64     SDL_Surface* data;
  65     SDL_Surface* tmp;
  66
  67 #ifndef MACOSX
  68     tmp = IMG_Load_RW( SDL_RWFromConstMem( icon, sizeof(icon)), 1);
  69     if( tmp != NULL) {
  70         SDL_WM_SetIcon( tmp, NULL);
  71         SDL_FreeSurface( tmp);
  72     }
  73 #endif
  74
  75     rect_update_cache = (SDL_Rect*)calloc(RECT_UPDATE_CACHE, sizeof(SDL_Rect));
  76     rect_update_old = (SDL_Rect*)calloc(RECT_UPDATE_CACHE, sizeof(SDL_Rect));
  77     rect_update_cache_current = 0;
  78     rect_update_old_count = 0;
  79
  80     images = (Image*)calloc( GR_COUNT, sizeof( Image));
  81
  82     for( i=0; i<GR_COUNT; i++) {
  83         tmp = IMG_Load_RW( SDL_RWFromConstMem( graphics[i].data, graphics[i].size), 1);
  84         if( !tmp) {
  85             fprintf( stderr, "Error: %s\n", SDL_GetError());
  86             continue;
  87         }
  88
  89         if( GRAPHICS_IS_FONT(i)) {
  90             /* Convert to RGB w/ colorkey=black for opacity support */
  91             SDL_SetColorKey( tmp, SDL_SRCCOLORKEY | SDL_RLEACCEL, SDL_MapRGB( tmp->format, 0, 0, 0));
  92             data = SDL_ConvertSurface( tmp, screen->format, SDL_SRCCOLORKEY | SDL_RLEACCEL);
  93         } else {
  94             /* Convert to RGBA for alpha channel from PNG */
  95             data = SDL_DisplayFormatAlpha( tmp);
  96         }
  97         SDL_FreeSurface( tmp);
  98
  99         if( !data) {
 100             fprintf( stderr, "Error: %s\n", SDL_GetError());
 101             continue;
 102         }
 103         images[i].data = data;
 104     }
 105
 106     buffer = SDL_CreateRGBSurface(SDL_SWSURFACE, WIDTH, HEIGHT,
 107                  screen->format->BitsPerPixel,
 108                  screen->format->Rmask,
 109                  screen->format->Gmask,
 110                  screen->format->Bmask,
 111                  screen->format->Amask);
 112
 113     background = SDL_CreateRGBSurface(SDL_SWSURFACE, WIDTH, HEIGHT,
 114                      screen->format->BitsPerPixel,
 115                      screen->format->Rmask,
 116                      screen->format->Gmask,
 117                      screen->format->Bmask,
 118                      screen->format->Amask);
 119
 120     if( buffer == NULL) {
 121         fprintf( stderr, "Cannot create buffer surface: %s\n", SDL_GetError());
 122     }
 123 }
 124
 125 void uninit_graphics() {
 126     int i;
 127
 128     for( i=0; i<GR_COUNT; i++) {
 129         SDL_FreeSurface( images[i].data);
 130     }
 131
 132     if( buffer != NULL) {
 133         SDL_FreeSurface( buffer);
 134     }
 135
 136     if (background != NULL) {
 137         SDL_FreeSurface(background);
 138     }
 139
 140     free(rect_update_cache);
 141     free(rect_update_old);
 142     free(images);
 143 }
 144
 145 int get_image_width( image_id id) {
 146     return images[id].data->w;
 147 }
 148
 149 int get_image_height( image_id id) {
 150     return images[id].data->h;
 151 }
 152
 153 int get_sprite_width( image_id id, int items) {
 154     return images[id].data->w / items;
 155 }
 156
 157 void show_sprite( image_id id, int pos, int items, int x_offset, int y_offset, int opacity) {
 158     SDL_Surface *bitmap;
 159     SDL_Rect src, dst;
 160
 161     bitmap = images[id].data;
 162
 163     if( !bitmap) return;
 164
 165     SDL_SetAlpha( bitmap, SDL_SRCALPHA | SDL_RLEACCEL, opacity);
 166
 167     dst.w = src.w = bitmap->w/items;
 168     dst.h = src.h = bitmap->h;
 169     src.x = src.w*pos;
 170     src.y = 0;
 171     dst.x = x_offset;
 172     dst.y = y_offset;
 173
 174     SDL_BlitSurface( bitmap, &src, screen, &dst);
 175     update_rect2(dst);
 176 }
 177
 178 void fill_image( image_id id, int x, int y, int w, int h) {
 179     SDL_Surface *bitmap;
 180     SDL_Rect src, dst;
 181     int dx = 0, dy = 0, cx, cy;
 182
 183     if( id >= GR_COUNT) return;
 184
 185     bitmap = images[id].data;
 186     src.x = src.y = 0;
 187
 188     while( dy < h) {
 189         src.h = dst.h = cy = (h-dy > bitmap->h)?(bitmap->h):(h-dy);
 190         dst.y = y+dy;
 191
 192         dx = 0;
 193         while( dx < w) {
 194             src.w = dst.w = cx = (w-dx > bitmap->w)?(bitmap->w):(w-dx);
 195             dst.x = x+dx;
 196
 197             SDL_BlitSurface( bitmap, &src, screen, &dst);
 198             update_rect2(dst);
 199
 200             dx += cx;
 201         }
 202
 203         dy += cy;
 204     }
 205 }
 206
 207 void line_horiz( int y, Uint8 r, Uint8 g, Uint8 b) {
 208     rectangle(0, y, screen->w, 1, r, g, b);
 209 }
 210
 211 void line_vert( int x, Uint8 r, Uint8 g, Uint8 b) {
 212     rectangle(x, 0, 1, screen->h, r, g, b);
 213 }
 214
 215 void rectangle( int x, int y, int w, int h, Uint8 r, Uint8 g, Uint8 b) {
 216     Uint32 color = SDL_MapRGB( screen->format, r, g, b);
 217     SDL_Rect rect;
 218
 219     rect.x = x;
 220     rect.y = y;
 221     rect.w = w;
 222     rect.h = h;
 223
 224     SDL_FillRect( screen, &rect, color);
 225     update_rect(x, y, w, h);
 226 }
 227
 228 void draw_button( int x, int y, int w, int h, Uint8 r, Uint8 g, Uint8 b, char pressed) {
 229     float diff = (pressed?1.0-BUTTON_HIGHLIGHT:1.0+BUTTON_HIGHLIGHT);
 230     int border = BUTTON_BORDER;
 231     rectangle( x, y, w, h, r*diff, g*diff, b*diff);
 232     rectangle( x+border, y+border, w-border, h-border, r/diff, g/diff, b/diff);
 233     rectangle( x+border, y+border, w-2*border, h-2*border, r, g, b);
 234 }
 235
 236 void draw_button_text( char* s, int x, int y, int w, int h, Uint8 r, Uint8 g, Uint8 b, char pressed) {
 237     int font_x, font_y;
 238     pressed = pressed?1:0;
 239     draw_button( x, y, w, h, r, g, b, pressed);
 240     font_x = x + w/2 - font_get_string_width( GR_SMALLISH_FONT, s)/2 + pressed*BUTTON_BORDER;
 241     font_y = y + h/2 - get_image_height( GR_SMALLISH_FONT)/2 + pressed*BUTTON_BORDER;
 242     font_draw_string( GR_SMALLISH_FONT, s, font_x, font_y, 0, 0);
 243 }
 244
 245 void clear_screen()
 246 {
 247     SDL_Rect rect;
 248
 249     rect.x = rect.y = 0;
 250     rect.w = WIDTH;
 251     rect.h = HEIGHT;
 252
 253     SDL_FillRect(screen, &rect, SDL_MapRGB(screen->format, 0, 0, 0));
 254 }
 255
 256 void store_screen()
 257 {
 258     SDL_BlitSurface(screen, NULL, background, NULL);
 259     rect_update_old[0].x = rect_update_old[0].y = 0;
 260     rect_update_old[0].w = WIDTH;
 261     rect_update_old[0].h = HEIGHT;
 262     rect_update_old_count = 1;
 263     rect_update_cache_current = 0;
 264 }
 265
 266 void reset_screen()
 267 {
 268     int i;
 269     SDL_Rect* tmp;
 270     SDL_BlitSurface(background, NULL, screen, NULL);
 271
 272     for (i=0; i<rect_update_cache_current; i++) {
 273         SDL_BlitSurface(background, &rect_update_cache[i], screen, &rect_update_cache[i]);
 274     }
 275
 276     /* Save rects I've just updated for redraw later */
 277     tmp = rect_update_cache;
 278     rect_update_cache = rect_update_old;
 279     rect_update_old = tmp;
 280     rect_update_old_count = rect_update_cache_current;
 281     rect_update_cache_current = 0;
 282 }
 283
 284 void update_rect(Sint32 x, Sint32 y, Sint32 w, Sint32 h)
 285 {
 286     static int inside = 0;
 287     if (inside) return;
 288     inside = 1;
 289     /*rectangle(x, y, w, h, 50+rand()%200, 50+rand()%200 ,50+rand()%200);*/
 290
 291     if ((x >= WIDTH) | (y >= HEIGHT) | (x+w <= 0) | (y+h <= 0) | (!w) | (!h)) {
 292         inside = 0;
 293         return;
 294     }
 295
 296     if (rect_update_cache_current == RECT_UPDATE_CACHE) {
 297         fprintf(stderr, "Overflow\n");
 298         rect_update_cache_current = 0;
 299     }
 300
 301     SDL_Rect* u = &(rect_update_cache[rect_update_cache_current]);
 302
 303     if (x < 0/* && x+w > 0*/) {
 304         w += x;
 305         x = 0;
 306     }
 307     if (y < 0/* && y+h > 0*/) {
 308         h += y;
 309         y = 0;
 310     }
 311
 312     if (x+w >= WIDTH) {
 313         w -= (x+w-WIDTH+1);
 314     }
 315
 316     if (y+h >= HEIGHT) {
 317         h -= (y+h-HEIGHT+1);
 318     }
 319
 320     if (w==0 || h==0) {
 321         inside = 0;
 322         return;
 323     }
 324
 325     u->x = x;
 326     u->y = y;
 327     u->w = w;
 328     u->h = h;
 329
 330     rect_update_cache_current++;
 331
 332     inside = 0;
 333 }
 334
 335 void updatescr()
 336 {
 337     int ticks = SDL_GetTicks();
 338     SDL_Rect *r_current = NULL, *end_current = NULL;
 339     SDL_Rect *r_old = NULL;
 340
 341     static int fading_last_time = 0;
 342     int fading_now = is_fading();
 343
 344     if (fading_now) {
 345         SDL_SetAlpha(buffer, SDL_SRCALPHA | SDL_RLEACCEL, 255-255*(ticks-fading_start)/FADE_DURATION);
 346         SDL_BlitSurface(buffer, NULL, screen, NULL);
 347         SDL_UpdateRect(screen, 0, 0, 0, 0);
 348     } else if (fading_last_time && !fading_now) {
 349         SDL_UpdateRect(screen, 0, 0, 0, 0);
 350     } else {
 351         if (rect_update_old_count == rect_update_cache_current) {
 352             /* Merge rects into one single rect list */
 353             r_old = rect_update_old;
 354             r_current = rect_update_cache;
 355             end_current = rect_update_cache + rect_update_cache_current;
 356             while (r_current != end_current) {
 357                 r_old->w = MAX(r_current->x+r_current->w, r_old->x+r_old->w);
 358                 r_old->h = MAX(r_current->y+r_current->h, r_old->y+r_old->h);
 359                 r_old->x = MIN(r_current->x, r_old->x);
 360                 r_old->y = MIN(r_current->y, r_old->y);
 361                 r_old->w -= r_old->x;
 362                 r_old->h -= r_old->y;
 363
 364                 r_current++;
 365                 r_old++;
 366             }
 367             SDL_UpdateRects(screen, rect_update_old_count, rect_update_old);
 368         } else {
 369             SDL_UpdateRects(screen, rect_update_old_count, rect_update_old);
 370             SDL_UpdateRects(screen, rect_update_cache_current, rect_update_cache);
 371         }
 372     }
 373
 374     reset_screen();
 375     fading_last_time = fading_now;
 376 }
 377
 378 void start_fade() {
 379     SDL_BlitSurface( screen, NULL, buffer, NULL);
 380     fading_start = SDL_GetTicks();
 381 }
 382
 383 int is_fading() {
 384     return SDL_GetTicks() < fading_start+FADE_DURATION;
 385 }
 386
 387 int font_get_metrics( image_id id, char ch, int* xp, int* wp) {
 388     SDL_Surface *bitmap;
 389     int pos, x = -1, w = 0;
 390     int search_pos = 0, search_x = 0;
 391     Uint8 red, green, blue;
 392
 393     if( id >= GR_COUNT) return 0;
 394
 395     pos = toupper( ch) - ' '; /* ' ' = first character in font bitmap */
 396
 397     bitmap = images[id].data;
 398
 399     SDL_LockSurface( bitmap);
 400     while( search_x < bitmap->w) {
 401         GET_PIXEL_RGB( bitmap, search_x, 0, &red, &green, &blue);
 402
 403         /* Increase pos counter if we have a "marker" pixel (255,0,255) */
 404         if( red > 250 && green < 10 && blue > 250) {
 405             search_pos++;
 406             if( search_pos == pos) {
 407                 x = search_x;
 408             } else if( search_pos == pos + 1) {
 409                 w = search_x - x;
 410                 break;
 411             }
 412         }
 413
 414         search_x++;
 415     }
 416     SDL_UnlockSurface( bitmap);
 417
 418     if( wp != NULL) (*wp) = w;
 419     if( xp != NULL) (*xp) = x;
 420
 421     return w;
 422 }
 423
 424 int font_draw_char( image_id id, char ch, int x_offset, int y_offset) {
 425     SDL_Surface *bitmap;
 426     SDL_Rect src, dst;
 427     int x = -1, w = 0;
 428
 429     font_get_metrics( id, ch, &x, &w);
 430     if( x == -1) return w;
 431
 432     bitmap = images[id].data;
 433
 434     dst.w = src.w = w;
 435     dst.h = src.h = bitmap->h - 1;
 436     src.x = x;
 437     src.y = 1;
 438     dst.x = x_offset;
 439     dst.y = y_offset;
 440
 441     SDL_BlitSurface( bitmap, &src, screen, &dst);
 442
 443     return src.w;
 444 }
 445
 446 void font_draw_string_alpha( image_id id, const char* s, int x_offset, int y_offset, int start, int animation, int opacity) {
 447     int y = y_offset;
 448     int x = x_offset;
 449     int i, additional_x = 0, additional_y = 0;
 450     float xw = 0.0, xw_diff;
 451     SDL_Surface *bitmap;
 452
 453     if( id > GR_COUNT) return;
 454
 455     bitmap = images[id].data;
 456     SDL_SetAlpha( bitmap, SDL_SRCALPHA | SDL_RLEACCEL, opacity);
 457
 458     if( animation & ANIMATION_BUNGEE) {
 459         xw = (25.0*sinf( start/10.0));
 460         xw_diff = 0.0;
 461         x -= xw / 2;
 462     }
 463
 464     if( animation & ANIMATION_PENDULUM) {
 465         x -= (int)(20.0*sinf( start/20.0));
 466         additional_x += 21;
 467     }
 468
 469     for( i=0; i<strlen(s); i++) {
 470         if( animation & ANIMATION_WAVE) {
 471             y = y_offset + (int)(3.0*sinf( start/10.0 + x/30.0));
 472         }
 473         x += font_draw_char( id, s[i], x, y);
 474         if( animation & ANIMATION_BUNGEE) {
 475             xw_diff += xw/strlen(s);
 476             if( xw_diff > 1.0 || xw_diff < -1.0) {
 477                 x += (int)(xw_diff);
 478                 if( xw_diff > 1.0) {
 479                     xw_diff -= 1.0;
 480                 } else {
 481                     xw_diff += 1.0;
 482                 }
 483             }
 484         }
 485     }
 486     if (animation & ANIMATION_WAVE) {
 487         additional_y += 4;
 488     }
 489     if (animation & ANIMATION_BUNGEE) {
 490         additional_x += 26;
 491     }
 492     update_rect(x_offset-additional_x, y_offset-additional_y, x-x_offset+additional_x*2, get_image_height(id)+additional_y*2);
 493 }
 494
 495 int font_get_string_width( image_id id, const char* s) {
 496     int w = 0, i;
 497
 498     for( i=0; i<strlen(s); i++) {
 499         w += font_get_metrics( id, s[i], NULL, NULL);
 500     }
 501
 502     return w;
 503 }
 504
 505 void draw_line_faded( int x1, int y1, int x2, int y2, int r, int g, int b, int r2, int g2, int b2) {
 506     float step, dx, dy, x = x1, y = y1;
 507     int i;
 508     char fade = (r!=r2 || g!=g2 || b!=b2);
 509
 510     step = (float)(abs(x2-x1)>abs(y2-y1)?abs(x2-x1):abs(y2-y1));
 511     dx = (float)(x2-x1) / step;
 512     dy = (float)(y2-y1) / step;
 513
 514     SDL_LockSurface( screen);
 515     for( i=0; i<step; i++) {
 516         x += dx;
 517         y += dy;
 518         if( x < 0.0 || x >= WIDTH || y < 0.0 || y >= HEIGHT) {
 519             continue;
 520         }
 521         if( fade) {
 522             SET_PIXEL_RGB( screen, (int)x, (int)y, (r*(step-i)+r2*i)/step, (g*(step-i)+g2*i)/step, (b*(step-i)+b2*i)/step);
 523         } else {
 524             SET_PIXEL_RGB( screen, (int)x, (int)y, r, g, b);
 525         }
 526     }
 527     SDL_UnlockSurface( screen);
 528 }
 529