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     RESOURCE(stadium)
  61 };
  62
  63 void init_graphics() {
  64     int i;
  65     SDL_Surface* data;
  66     SDL_Surface* tmp;
  67
  68 #ifndef MACOSX
  69     tmp = IMG_Load_RW( SDL_RWFromConstMem( icon, sizeof(icon)), 1);
  70     if( tmp != NULL) {
  71         SDL_WM_SetIcon( tmp, NULL);
  72         SDL_FreeSurface( tmp);
  73     }
  74 #endif
  75
  76     rect_update_cache = (SDL_Rect*)calloc(RECT_UPDATE_CACHE, sizeof(SDL_Rect));
  77     rect_update_old = (SDL_Rect*)calloc(RECT_UPDATE_CACHE, sizeof(SDL_Rect));
  78     rect_update_cache_current = 0;
  79     rect_update_old_count = 0;
  80
  81     images = (Image*)calloc( GR_COUNT, sizeof( Image));
  82
  83     for( i=0; i<GR_COUNT; i++) {
  84         tmp = IMG_Load_RW( SDL_RWFromConstMem( graphics[i].data, graphics[i].size), 1);
  85         if( !tmp) {
  86             fprintf( stderr, "Error: %s\n", SDL_GetError());
  87             continue;
  88         }
  89
  90         if( GRAPHICS_IS_FONT(i)) {
  91             /* Convert to RGB w/ colorkey=black for opacity support */
  92             SDL_SetColorKey( tmp, SDL_SRCCOLORKEY | SDL_RLEACCEL, SDL_MapRGB( tmp->format, 0, 0, 0));
  93             data = SDL_ConvertSurface( tmp, screen->format, SDL_SRCCOLORKEY | SDL_RLEACCEL);
  94         } else {
  95             /* Convert to RGBA for alpha channel from PNG */
  96             data = SDL_DisplayFormatAlpha( tmp);
  97         }
  98         SDL_FreeSurface( tmp);
  99
 100         if( !data) {
 101             fprintf( stderr, "Error: %s\n", SDL_GetError());
 102             continue;
 103         }
 104         images[i].data = data;
 105     }
 106
 107     buffer = SDL_CreateRGBSurface(SDL_SWSURFACE, WIDTH, HEIGHT,
 108                  screen->format->BitsPerPixel,
 109                  screen->format->Rmask,
 110                  screen->format->Gmask,
 111                  screen->format->Bmask,
 112                  screen->format->Amask);
 113
 114     background = SDL_CreateRGBSurface(SDL_SWSURFACE, WIDTH, HEIGHT,
 115                      screen->format->BitsPerPixel,
 116                      screen->format->Rmask,
 117                      screen->format->Gmask,
 118                      screen->format->Bmask,
 119                      screen->format->Amask);
 120
 121     if( buffer == NULL) {
 122         fprintf( stderr, "Cannot create buffer surface: %s\n", SDL_GetError());
 123     }
 124 }
 125
 126 void uninit_graphics() {
 127     int i;
 128
 129     for( i=0; i<GR_COUNT; i++) {
 130         SDL_FreeSurface( images[i].data);
 131     }
 132
 133     if( buffer != NULL) {
 134         SDL_FreeSurface( buffer);
 135     }
 136
 137     if (background != NULL) {
 138         SDL_FreeSurface(background);
 139     }
 140
 141     free(rect_update_cache);
 142     free(rect_update_old);
 143     free(images);
 144 }
 145
 146 int get_image_width( image_id id) {
 147     return images[id].data->w;
 148 }
 149
 150 int get_image_height( image_id id) {
 151     return images[id].data->h;
 152 }
 153
 154 int get_sprite_width( image_id id, int items) {
 155     return images[id].data->w / items;
 156 }
 157
 158 void show_sprite( image_id id, int pos, int items, int x_offset, int y_offset, int opacity) {
 159     SDL_Surface *bitmap;
 160     SDL_Rect src, dst;
 161
 162     bitmap = images[id].data;
 163
 164     if( !bitmap) return;
 165
 166     SDL_SetAlpha( bitmap, SDL_SRCALPHA | SDL_RLEACCEL, opacity);
 167
 168     dst.w = src.w = bitmap->w/items;
 169     dst.h = src.h = bitmap->h;
 170     src.x = src.w*pos;
 171     src.y = 0;
 172     dst.x = x_offset;
 173     dst.y = y_offset;
 174
 175     SDL_BlitSurface( bitmap, &src, screen, &dst);
 176     update_rect2(dst);
 177 }
 178
 179 void fill_image( image_id id, int x, int y, int w, int h) {
 180     SDL_Surface *bitmap;
 181     SDL_Rect src, dst;
 182     int dx = 0, dy = 0, cx, cy;
 183
 184     if( id >= GR_COUNT) return;
 185
 186     bitmap = images[id].data;
 187     src.x = src.y = 0;
 188
 189     while( dy < h) {
 190         src.h = dst.h = cy = (h-dy > bitmap->h)?(bitmap->h):(h-dy);
 191         dst.y = y+dy;
 192
 193         dx = 0;
 194         while( dx < w) {
 195             src.w = dst.w = cx = (w-dx > bitmap->w)?(bitmap->w):(w-dx);
 196             dst.x = x+dx;
 197
 198             SDL_BlitSurface( bitmap, &src, screen, &dst);
 199             update_rect2(dst);
 200
 201             dx += cx;
 202         }
 203
 204         dy += cy;
 205     }
 206 }
 207
 208 void line_horiz( int y, Uint8 r, Uint8 g, Uint8 b) {
 209     rectangle(0, y, screen->w, 1, r, g, b);
 210 }
 211
 212 void line_vert( int x, Uint8 r, Uint8 g, Uint8 b) {
 213     rectangle(x, 0, 1, screen->h, r, g, b);
 214 }
 215
 216 void rectangle( int x, int y, int w, int h, Uint8 r, Uint8 g, Uint8 b) {
 217     Uint32 color = SDL_MapRGB( screen->format, r, g, b);
 218     SDL_Rect rect;
 219
 220     rect.x = x;
 221     rect.y = y;
 222     rect.w = w;
 223     rect.h = h;
 224
 225     SDL_FillRect( screen, &rect, color);
 226     update_rect(x, y, w, h);
 227 }
 228
 229 void draw_button( int x, int y, int w, int h, Uint8 r, Uint8 g, Uint8 b, char pressed) {
 230     float diff = (pressed?1.0-BUTTON_HIGHLIGHT:1.0+BUTTON_HIGHLIGHT);
 231     int border = BUTTON_BORDER;
 232     rectangle( x, y, w, h, r*diff, g*diff, b*diff);
 233     rectangle( x+border, y+border, w-border, h-border, r/diff, g/diff, b/diff);
 234     rectangle( x+border, y+border, w-2*border, h-2*border, r, g, b);
 235 }
 236
 237 void draw_button_text( char* s, int x, int y, int w, int h, Uint8 r, Uint8 g, Uint8 b, char pressed) {
 238     int font_x, font_y;
 239     pressed = pressed?1:0;
 240     draw_button( x, y, w, h, r, g, b, pressed);
 241     font_x = x + w/2 - font_get_string_width( GR_SMALLISH_FONT, s)/2 + pressed*BUTTON_BORDER;
 242     font_y = y + h/2 - get_image_height( GR_SMALLISH_FONT)/2 + pressed*BUTTON_BORDER;
 243     font_draw_string( GR_SMALLISH_FONT, s, font_x, font_y, 0, 0);
 244 }
 245
 246 void clear_screen()
 247 {
 248     SDL_Rect rect;
 249
 250     rect.x = rect.y = 0;
 251     rect.w = WIDTH;
 252     rect.h = HEIGHT;
 253
 254     SDL_FillRect(screen, &rect, SDL_MapRGB(screen->format, 0, 0, 0));
 255 }
 256
 257 void store_screen()
 258 {
 259     SDL_BlitSurface(screen, NULL, background, NULL);
 260     rect_update_old[0].x = rect_update_old[0].y = 0;
 261     rect_update_old[0].w = WIDTH;
 262     rect_update_old[0].h = HEIGHT;
 263     rect_update_old_count = 1;
 264     rect_update_cache_current = 0;
 265 }
 266
 267 void reset_screen()
 268 {
 269     int i;
 270     SDL_Rect* tmp;
 271     SDL_BlitSurface(background, NULL, screen, NULL);
 272
 273     for (i=0; i<rect_update_cache_current; i++) {
 274         SDL_BlitSurface(background, &rect_update_cache[i], screen, &rect_update_cache[i]);
 275     }
 276
 277     /* Save rects I've just updated for redraw later */
 278     tmp = rect_update_cache;
 279     rect_update_cache = rect_update_old;
 280     rect_update_old = tmp;
 281     rect_update_old_count = rect_update_cache_current;
 282     rect_update_cache_current = 0;
 283 }
 284
 285 void update_rect(Sint32 x, Sint32 y, Sint32 w, Sint32 h)
 286 {
 287     static int inside = 0;
 288     if (inside) return;
 289     inside = 1;
 290     /*rectangle(x, y, w, h, 50+rand()%200, 50+rand()%200 ,50+rand()%200);*/
 291
 292     if ((x >= WIDTH) | (y >= HEIGHT) | (x+w <= 0) | (y+h <= 0) | (!w) | (!h)) {
 293         inside = 0;
 294         return;
 295     }
 296
 297     if (rect_update_cache_current == RECT_UPDATE_CACHE) {
 298         fprintf(stderr, "Overflow\n");
 299         rect_update_cache_current = 0;
 300     }
 301
 302     SDL_Rect* u = &(rect_update_cache[rect_update_cache_current]);
 303
 304     if (x < 0/* && x+w > 0*/) {
 305         w += x;
 306         x = 0;
 307     }
 308     if (y < 0/* && y+h > 0*/) {
 309         h += y;
 310         y = 0;
 311     }
 312
 313     if (x+w >= WIDTH) {
 314         w -= (x+w-WIDTH+1);
 315     }
 316
 317     if (y+h >= HEIGHT) {
 318         h -= (y+h-HEIGHT+1);
 319     }
 320
 321     if (w==0 || h==0) {
 322         inside = 0;
 323         return;
 324     }
 325
 326     u->x = x;
 327     u->y = y;
 328     u->w = w;
 329     u->h = h;
 330
 331     rect_update_cache_current++;
 332
 333     inside = 0;
 334 }
 335
 336 void updatescr()
 337 {
 338     int ticks = SDL_GetTicks();
 339     SDL_Rect *r_current = NULL, *end_current = NULL;
 340     SDL_Rect *r_old = NULL;
 341
 342     static int fading_last_time = 0;
 343     int fading_now = is_fading();
 344
 345     if (fading_now) {
 346         SDL_SetAlpha(buffer, SDL_SRCALPHA | SDL_RLEACCEL, 255-255*(ticks-fading_start)/FADE_DURATION);
 347         SDL_BlitSurface(buffer, NULL, screen, NULL);
 348         SDL_UpdateRect(screen, 0, 0, 0, 0);
 349     } else if (fading_last_time && !fading_now) {
 350         SDL_UpdateRect(screen, 0, 0, 0, 0);
 351     } else {
 352         if (rect_update_old_count == rect_update_cache_current) {
 353             /* Merge rects into one single rect list */
 354             r_old = rect_update_old;
 355             r_current = rect_update_cache;
 356             end_current = rect_update_cache + rect_update_cache_current;
 357             while (r_current != end_current) {
 358                 r_old->w = MAX(r_current->x+r_current->w, r_old->x+r_old->w);
 359                 r_old->h = MAX(r_current->y+r_current->h, r_old->y+r_old->h);
 360                 r_old->x = MIN(r_current->x, r_old->x);
 361                 r_old->y = MIN(r_current->y, r_old->y);
 362                 r_old->w -= r_old->x;
 363                 r_old->h -= r_old->y;
 364
 365                 r_current++;
 366                 r_old++;
 367             }
 368             SDL_UpdateRects(screen, rect_update_old_count, rect_update_old);
 369         } else {
 370             SDL_UpdateRects(screen, rect_update_old_count, rect_update_old);
 371             SDL_UpdateRects(screen, rect_update_cache_current, rect_update_cache);
 372         }
 373     }
 374
 375     reset_screen();
 376     fading_last_time = fading_now;
 377 }
 378
 379 void start_fade() {
 380     SDL_BlitSurface( screen, NULL, buffer, NULL);
 381     fading_start = SDL_GetTicks();
 382 }
 383
 384 int is_fading() {
 385     return SDL_GetTicks() < fading_start+FADE_DURATION;
 386 }
 387
 388 int font_get_metrics( image_id id, char ch, int* xp, int* wp) {
 389     SDL_Surface *bitmap;
 390     int pos, x = -1, w = 0;
 391     int search_pos = 0, search_x = 0;
 392     Uint8 red, green, blue;
 393
 394     if( id >= GR_COUNT) return 0;
 395
 396     pos = toupper( ch) - ' '; /* ' ' = first character in font bitmap */
 397
 398     bitmap = images[id].data;
 399
 400     SDL_LockSurface( bitmap);
 401     while( search_x < bitmap->w) {
 402         GET_PIXEL_RGB( bitmap, search_x, 0, &red, &green, &blue);
 403
 404         /* Increase pos counter if we have a "marker" pixel (255,0,255) */
 405         if( red > 250 && green < 10 && blue > 250) {
 406             search_pos++;
 407             if( search_pos == pos) {
 408                 x = search_x;
 409             } else if( search_pos == pos + 1) {
 410                 w = search_x - x;
 411                 break;
 412             }
 413         }
 414
 415         search_x++;
 416     }
 417     SDL_UnlockSurface( bitmap);
 418
 419     if( wp != NULL) (*wp) = w;
 420     if( xp != NULL) (*xp) = x;
 421
 422     return w;
 423 }
 424
 425 int font_draw_char( image_id id, char ch, int x_offset, int y_offset) {
 426     SDL_Surface *bitmap;
 427     SDL_Rect src, dst;
 428     int x = -1, w = 0;
 429
 430     font_get_metrics( id, ch, &x, &w);
 431     if( x == -1) return w;
 432
 433     bitmap = images[id].data;
 434
 435     dst.w = src.w = w;
 436     dst.h = src.h = bitmap->h - 1;
 437     src.x = x;
 438     src.y = 1;
 439     dst.x = x_offset;
 440     dst.y = y_offset;
 441
 442     SDL_BlitSurface( bitmap, &src, screen, &dst);
 443
 444     return src.w;
 445 }
 446
 447 void font_draw_string_alpha( image_id id, const char* s, int x_offset, int y_offset, int start, int animation, int opacity) {
 448     int y = y_offset;
 449     int x = x_offset;
 450     int i, additional_x = 0, additional_y = 0;
 451     float xw = 0.0, xw_diff;
 452     SDL_Surface *bitmap;
 453
 454     if( id > GR_COUNT) return;
 455
 456     bitmap = images[id].data;
 457     SDL_SetAlpha( bitmap, SDL_SRCALPHA | SDL_RLEACCEL, opacity);
 458
 459     if( animation & ANIMATION_BUNGEE) {
 460         xw = (25.0*sinf( start/10.0));
 461         xw_diff = 0.0;
 462         x -= xw / 2;
 463     }
 464
 465     if( animation & ANIMATION_PENDULUM) {
 466         x -= (int)(20.0*sinf( start/20.0));
 467         additional_x += 21;
 468     }
 469
 470     for( i=0; i<strlen(s); i++) {
 471         if( animation & ANIMATION_WAVE) {
 472             y = y_offset + (int)(3.0*sinf( start/10.0 + x/30.0));
 473         }
 474         x += font_draw_char( id, s[i], x, y);
 475         if( animation & ANIMATION_BUNGEE) {
 476             xw_diff += xw/strlen(s);
 477             if( xw_diff > 1.0 || xw_diff < -1.0) {
 478                 x += (int)(xw_diff);
 479                 if( xw_diff > 1.0) {
 480                     xw_diff -= 1.0;
 481                 } else {
 482                     xw_diff += 1.0;
 483                 }
 484             }
 485         }
 486     }
 487     if (animation & ANIMATION_WAVE) {
 488         additional_y += 4;
 489     }
 490     if (animation & ANIMATION_BUNGEE) {
 491         additional_x += 26;
 492     }
 493     update_rect(x_offset-additional_x, y_offset-additional_y, x-x_offset+additional_x*2, get_image_height(id)+additional_y*2);
 494 }
 495
 496 int font_get_string_width( image_id id, const char* s) {
 497     int w = 0, i;
 498
 499     for( i=0; i<strlen(s); i++) {
 500         w += font_get_metrics( id, s[i], NULL, NULL);
 501     }
 502
 503     return w;
 504 }
 505
 506 void draw_line_faded( int x1, int y1, int x2, int y2, int r, int g, int b, int r2, int g2, int b2) {
 507     float step, dx, dy, x = x1, y = y1;
 508     int i;
 509     char fade = (r!=r2 || g!=g2 || b!=b2);
 510
 511     step = (float)(abs(x2-x1)>abs(y2-y1)?abs(x2-x1):abs(y2-y1));
 512     dx = (float)(x2-x1) / step;
 513     dy = (float)(y2-y1) / step;
 514
 515     SDL_LockSurface( screen);
 516     for( i=0; i<step; i++) {
 517         x += dx;
 518         y += dy;
 519         if( x < 0.0 || x >= WIDTH || y < 0.0 || y >= HEIGHT) {
 520             continue;
 521         }
 522         if( fade) {
 523             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);
 524         } else {
 525             SET_PIXEL_RGB( screen, (int)x, (int)y, r, g, b);
 526         }
 527     }
 528     SDL_UnlockSurface( screen);
 529 }
 530