graphics.c

   1 #include <stdio.h>
   2
   3 #include "tennix.h"
   4 #include "graphics.h"
   5 #include "input.h"
   6
   7 static Image* images;
   8
   9 static const char* filenames[] = {
  10     "court.bmp",
  11     "shadow.png",
  12     "player-racket.bmp",
  13     "ground.png",
  14     "ball.png",
  15     "score.png",
  16     "menu.bmp",
  17     "animation.bmp"
  18 };
  19
  20 void init_graphics( const char *data_dir) {
  21     int i;
  22     SDL_Surface* data;
  23     SDL_Surface* tmp;
  24     char temp[MAXPATHLEN];
  25
  26     images = (Image*)calloc( GR_COUNT, sizeof( Image));
  27
  28     for( i=0; i<GR_COUNT; i++) {
  29         strcpy( temp, data_dir);
  30         strcat( temp, filenames[i]);
  31         tmp = IMG_Load( temp);
  32         if( !tmp) {
  33             fprintf( stderr, "Error: %s\n", SDL_GetError());
  34             continue;
  35         }
  36
  37         SDL_SetColorKey( tmp, SDL_SRCCOLORKEY, SDL_MapRGB( tmp->format, 0, 0, 0));
  38         data = SDL_DisplayFormatAlpha( tmp);
  39         SDL_FreeSurface( tmp);
  40
  41         if( !data) {
  42             fprintf( stderr, "Error: %s\n", SDL_GetError());
  43             continue;
  44         }
  45         images[i].data = data;
  46     }
  47 }
  48
  49 void uninit_graphics() {
  50     int i;
  51
  52     for( i=0; i<GR_COUNT; i++) {
  53         SDL_FreeSurface( images[i].data);
  54     }
  55
  56     free( images);
  57 }
  58
  59 void show_sprite( unsigned int id, int pos, int items, int x_offset, int y_offset, int opacity) {
  60     SDL_Surface *bitmap;
  61     SDL_Rect src, dst;
  62
  63     bitmap = images[id].data;
  64
  65     if( !bitmap) return;
  66
  67     SDL_SetAlpha( bitmap, SDL_SRCALPHA | SDL_RLEACCEL, opacity);
  68
  69     dst.w = src.w = bitmap->w/items;
  70     dst.h = src.h = bitmap->h;
  71     src.x = src.w*pos;
  72     src.y = 0;
  73     dst.x = x_offset;
  74     dst.y = y_offset;
  75
  76     SDL_BlitSurface( bitmap, &src, screen, &dst);
  77 }
  78
  79 void show_image( unsigned int id, int x_offset, int y_offset, int opacity) {
  80     show_sprite( id, 0, 1, x_offset, y_offset, opacity);
  81 }
  82
  83 void show_digit( int zahl, int x_offset, int y_offset, int opacity) {
  84     show_sprite( GR_SCORE, zahl, 11, x_offset, y_offset, opacity);
  85 }
  86
  87 void introimage( unsigned int id) {
  88     int i;
  89
  90     for( i=0; i<256; i+=10) {
  91         clearscr();
  92         show_image( id, 0, 0, i);
  93         updatescr();
  94         SDL_Delay( 30);
  95     }
  96
  97     //SDL_Delay( 500);
  98     wait_keypress();
  99
 100     for( i=255; i>=0; i-=10) {
 101         clearscr();
 102         show_image( id, 0, 0, i);
 103         updatescr();
 104         SDL_Delay( 30);
 105     }
 106
 107     clearscr();
 108 }
 109
 110 void clearscr() {
 111     SDL_Rect rect;
 112
 113     rect.x = 0;
 114     rect.y = 0;
 115     rect.w = WIDTH;
 116     rect.h = HEIGHT;
 117
 118     SDL_FillRect( screen, &rect, SDL_MapRGB( screen->format, 0, 0, 0));
 119 }
 120
 121 void updatescr() {
 122     SDL_UpdateRect( screen, 0, 0, 0, 0);
 123     SDL_Flip( screen);
 124 }
 125