graphics.c

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