graphics.c

   1
   2 /**
   3  *
   4  * Tennix! SDL Port
   5  * Copyright (C) 2003, 2007 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 #include "input.h"
  31
  32 static Image* images;
  33
  34 static SDL_Surface *buffer;
  35
  36 static Uint32 fading_start = 0;
  37
  38 #include "data/graphics_data.c"
  39 static const ResourceData graphics[] = {
  40     RESOURCE(court),
  41     RESOURCE(shadow),
  42     RESOURCE(player_racket),
  43     RESOURCE(ground),
  44     RESOURCE(ball),
  45     RESOURCE(menu),
  46     RESOURCE(smallish_font),
  47     RESOURCE(dkc2)
  48 };
  49
  50 void init_graphics( const char *data_dir) {
  51     int i;
  52     SDL_Surface* data;
  53     SDL_Surface* tmp;
  54
  55 #ifndef MACOSX
  56     tmp = IMG_Load_RW( SDL_RWFromConstMem( icon, sizeof(icon)), 1);
  57     if( tmp != NULL) {
  58         SDL_WM_SetIcon( tmp, NULL);
  59         SDL_FreeSurface( tmp);
  60     }
  61 #endif
  62
  63     images = (Image*)calloc( GR_COUNT, sizeof( Image));
  64
  65     for( i=0; i<GR_COUNT; i++) {
  66         tmp = IMG_Load_RW( SDL_RWFromConstMem( graphics[i].data, graphics[i].size), 1);
  67         if( !tmp) {
  68             fprintf( stderr, "Error: %s\n", SDL_GetError());
  69             continue;
  70         }
  71
  72         SDL_SetColorKey( tmp, SDL_SRCCOLORKEY, SDL_MapRGB( tmp->format, 0, 0, 0));
  73         data = SDL_DisplayFormatAlpha( tmp);
  74         SDL_FreeSurface( tmp);
  75
  76         if( !data) {
  77             fprintf( stderr, "Error: %s\n", SDL_GetError());
  78             continue;
  79         }
  80         images[i].data = data;
  81     }
  82
  83     buffer = SDL_CreateRGBSurface( SDL_HWSURFACE, WIDTH, HEIGHT, screen->format->BitsPerPixel, screen->format->Rmask, screen->format->Gmask, screen->format->Bmask, screen->format->Amask);
  84
  85     if( buffer == NULL) {
  86         fprintf( stderr, "Cannot create buffer surface: %s\n", SDL_GetError());
  87     }
  88 }
  89
  90 void uninit_graphics() {
  91     int i;
  92
  93     for( i=0; i<GR_COUNT; i++) {
  94         SDL_FreeSurface( images[i].data);
  95     }
  96
  97     if( buffer != NULL) {
  98         SDL_FreeSurface( buffer);
  99     }
 100
 101     free( images);
 102 }
 103
 104 int get_image_width( unsigned int id) {
 105     return images[id].data->w;
 106 }
 107
 108 int get_image_height( unsigned int id) {
 109     return images[id].data->h;
 110 }
 111
 112 int get_sprite_width( unsigned int id, int items) {
 113     return images[id].data->w / items;
 114 }
 115
 116 void show_sprite( unsigned int id, int pos, int items, int x_offset, int y_offset, int opacity) {
 117     SDL_Surface *bitmap;
 118     SDL_Rect src, dst;
 119
 120     bitmap = images[id].data;
 121
 122     if( !bitmap) return;
 123
 124     SDL_SetAlpha( bitmap, SDL_SRCALPHA | SDL_RLEACCEL, opacity);
 125
 126     dst.w = src.w = bitmap->w/items;
 127     dst.h = src.h = bitmap->h;
 128     src.x = src.w*pos;
 129     src.y = 0;
 130     dst.x = x_offset;
 131     dst.y = y_offset;
 132
 133     SDL_BlitSurface( bitmap, &src, screen, &dst);
 134 }
 135
 136 void line_horiz( int y, Uint8 r, Uint8 g, Uint8 b) {
 137     Uint32 color = SDL_MapRGB( screen->format, r, g, b);
 138     SDL_Rect rect;
 139
 140     rect.x = 0;
 141     rect.w = screen->w;
 142     rect.y = y;
 143     rect.h = 1;
 144
 145     SDL_FillRect( screen, &rect, color);
 146 }
 147
 148 void line_vert( int x, Uint8 r, Uint8 g, Uint8 b) {
 149     Uint32 color = SDL_MapRGB( screen->format, r, g, b);
 150     SDL_Rect rect;
 151
 152     rect.x = x;
 153     rect.w = 1;
 154     rect.y = 0;
 155     rect.h = screen->h;
 156
 157     SDL_FillRect( screen, &rect, color);
 158 }
 159
 160 void rectangle( int x, int y, int w, int h, Uint8 r, Uint8 g, Uint8 b) {
 161     Uint32 color = SDL_MapRGB( screen->format, r, g, b);
 162     SDL_Rect rect;
 163
 164     rect.x = x;
 165     rect.y = y;
 166     rect.w = w;
 167     rect.h = h;
 168
 169     SDL_FillRect( screen, &rect, color);
 170 }
 171
 172 void draw_button( int x, int y, int w, int h, Uint8 r, Uint8 g, Uint8 b, char pressed) {
 173     float diff = (pressed?1.0-BUTTON_HIGHLIGHT:1.0+BUTTON_HIGHLIGHT);
 174     int border = BUTTON_BORDER;
 175     rectangle( x, y, w, h, r*diff, g*diff, b*diff);
 176     rectangle( x+border, y+border, w-border, h-border, r/diff, g/diff, b/diff);
 177     rectangle( x+border, y+border, w-2*border, h-2*border, r, g, b);
 178 }
 179
 180 void draw_button_text( char* s, int x, int y, int w, int h, Uint8 r, Uint8 g, Uint8 b, char pressed) {
 181     int font_x, font_y;
 182     pressed = pressed?1:0;
 183     draw_button( x, y, w, h, r, g, b, pressed);
 184     font_x = x + w/2 - font_get_string_width( GR_SMALLISH_FONT, s)/2 + pressed*BUTTON_BORDER;
 185     font_y = y + h/2 - get_image_height( GR_SMALLISH_FONT)/2 + pressed*BUTTON_BORDER;
 186     font_draw_string( GR_SMALLISH_FONT, s, font_x, font_y, 0, 0);
 187 }
 188
 189 void show_image( unsigned int id, int x_offset, int y_offset, int opacity) {
 190     show_sprite( id, 0, 1, x_offset, y_offset, opacity);
 191 }
 192
 193 void introimage( unsigned int id) {
 194     int i;
 195
 196     for( i=0; i<256; i+=10) {
 197         clearscr();
 198         show_image( id, 0, 0, i);
 199         updatescr();
 200         SDL_Delay( 30);
 201     }
 202
 203     //SDL_Delay( 500);
 204     wait_keypress();
 205
 206     for( i=255; i>=0; i-=10) {
 207         clearscr();
 208         show_image( id, 0, 0, i);
 209         updatescr();
 210         SDL_Delay( 30);
 211     }
 212
 213     clearscr();
 214 }
 215
 216 void clearscr() {
 217     SDL_Rect rect;
 218
 219     rect.x = 0;
 220     rect.y = 0;
 221     rect.w = WIDTH;
 222     rect.h = HEIGHT;
 223
 224     SDL_FillRect( screen, &rect, SDL_MapRGB( screen->format, 0, 0, 0));
 225 }
 226
 227 void updatescr() {
 228     int ticks = SDL_GetTicks();
 229
 230     if( ticks < fading_start+FADE_DURATION) {
 231         SDL_SetAlpha( buffer, SDL_SRCALPHA | SDL_RLEACCEL, 255-255*(ticks-fading_start)/FADE_DURATION);
 232         SDL_BlitSurface( buffer, NULL, screen, NULL);
 233     }
 234
 235     SDL_UpdateRect( screen, 0, 0, 0, 0);
 236     SDL_Flip( screen);
 237 }
 238
 239 void start_fade() {
 240     SDL_BlitSurface( screen, NULL, buffer, NULL);
 241     fading_start = SDL_GetTicks();
 242 }
 243
 244 int is_fading() {
 245     return SDL_GetTicks() < fading_start+FADE_DURATION;
 246 }
 247
 248 int font_get_metrics( unsigned int id, char ch, int* xp, int* wp) {
 249     SDL_Surface *bitmap;
 250     int pos, x = -1, w = 0;
 251     int search_pos = 0, search_x = 0;
 252     Uint8 red, green, blue;
 253
 254     if( id > GR_COUNT) return 0;
 255
 256     pos = toupper( ch) - ' '; /* ' ' = first character in font bitmap */
 257
 258     bitmap = images[id].data;
 259
 260     SDL_LockSurface( bitmap);
 261     while( search_x < bitmap->w) {
 262         GET_PIXEL_RGB( bitmap, search_x, 0, &red, &green, &blue);
 263
 264         /* Increase pos counter if we have a "marker" pixel (255,0,255) */
 265         if( red > 250 && green < 10 && blue > 250) {
 266             search_pos++;
 267             if( search_pos == pos) {
 268                 x = search_x;
 269             } else if( search_pos == pos + 1) {
 270                 w = search_x - x;
 271                 break;
 272             }
 273         }
 274
 275         search_x++;
 276     }
 277     SDL_UnlockSurface( bitmap);
 278
 279     if( wp != NULL) (*wp) = w;
 280     if( xp != NULL) (*xp) = x;
 281
 282     return w;
 283 }
 284
 285 int font_draw_char( unsigned int id, char ch, int x_offset, int y_offset) {
 286     SDL_Surface *bitmap;
 287     SDL_Rect src, dst;
 288     int x = -1, w = 0;
 289
 290     font_get_metrics( id, ch, &x, &w);
 291     if( x == -1) return w;
 292
 293     bitmap = images[id].data;
 294
 295     dst.w = src.w = w;
 296     dst.h = src.h = bitmap->h - 1;
 297     src.x = x;
 298     src.y = 1;
 299     dst.x = x_offset;
 300     dst.y = y_offset;
 301
 302     SDL_BlitSurface( bitmap, &src, screen, &dst);
 303
 304     return src.w;
 305 }
 306
 307 void font_draw_string( unsigned int id, char* s, int x_offset, int y_offset, int start, int animation) {
 308     int y = y_offset;
 309     int x = x_offset;
 310     int i;
 311     float xw = 0.0, xw_diff;
 312
 313     if( animation & ANIMATION_BUNGEE) {
 314         xw = (25.0*sinf( start/10.0));
 315         xw_diff = 0.0;
 316         x -= xw / 2;
 317     }
 318
 319     if( animation & ANIMATION_PENDULUM) {
 320         x -= (int)(20.0*sinf( start/20.0));
 321     }
 322
 323     for( i=0; i<strlen(s); i++) {
 324         if( animation & ANIMATION_WAVE) {
 325             y = y_offset + (int)(3.0*sinf( start/10.0 + x/30.0));
 326         }
 327         x += font_draw_char( id, s[i], x, y);
 328         if( animation & ANIMATION_BUNGEE) {
 329             xw_diff += xw/strlen(s);
 330             if( xw_diff > 1.0 || xw_diff < -1.0) {
 331                 x += (int)(xw_diff);
 332                 if( xw_diff > 1.0) {
 333                     xw_diff -= 1.0;
 334                 } else {
 335                     xw_diff += 1.0;
 336                 }
 337             }
 338         }
 339     }
 340 }
 341
 342 int font_get_string_width( unsigned int id, char* s) {
 343     int w = 0, i;
 344
 345     for( i=0; i<strlen(s); i++) {
 346         w += font_get_metrics( id, s[i], NULL, NULL);
 347     }
 348
 349     return w;
 350 }
 351
 352 void draw_line_faded( int x1, int y1, int x2, int y2, int r, int g, int b, int r2, int g2, int b2) {
 353     float step, dx, dy, x = x1, y = y1;
 354     int i;
 355     char fade = (r!=r2 || g!=g2 || b!=b2);
 356
 357     step = (float)(abs(x2-x1)>abs(y2-y1)?abs(x2-x1):abs(y2-y1));
 358     dx = (float)(x2-x1) / step;
 359     dy = (float)(y2-y1) / step;
 360
 361     SDL_LockSurface( screen);
 362     for( i=0; i<step; i++) {
 363         x += dx;
 364         y += dy;
 365         if( x < 0.0 || x >= WIDTH || y < 0.0 || y >= HEIGHT) {
 366             continue;
 367         }
 368         if( fade) {
 369             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);
 370         } else {
 371             SET_PIXEL_RGB( screen, (int)x, (int)y, r, g, b);
 372         }
 373     }
 374     SDL_UnlockSurface( screen);
 375 }
 376