| 1 | |
| 2 | /* Simple program: Fill a colormap with gray and stripe it down the screen */ |
| 3 | |
| 4 | #include <stdio.h> |
| 5 | #include <stdlib.h> |
| 6 | #include <string.h> |
| 7 | #include <time.h> |
| 8 | |
| 9 | #include "SDL.h" |
| 10 | |
| 11 | #ifdef TEST_VGA16 /* Define this if you want to test VGA 16-color video modes */ |
| 12 | #define NUM_COLORS 16 |
| 13 | #else |
| 14 | #define NUM_COLORS 256 |
| 15 | #endif |
| 16 | |
| 17 | /* Draw a randomly sized and colored box centered about (X,Y) */ |
| 18 | void DrawBox(SDL_Surface *screen, int X, int Y, int width, int height) |
| 19 | { |
| 20 | static unsigned int seeded = 0; |
| 21 | SDL_Rect area; |
| 22 | Uint32 color; |
| 23 | Uint32 randc; |
| 24 | |
| 25 | /* Seed the random number generator */ |
| 26 | if ( seeded == 0 ) { |
| 27 | srand(time(NULL)); |
| 28 | seeded = 1; |
| 29 | } |
| 30 | |
| 31 | /* Get the bounds of the rectangle */ |
| 32 | area.w = (rand()%width); |
| 33 | area.h = (rand()%height); |
| 34 | area.x = X-(area.w/2); |
| 35 | area.y = Y-(area.h/2); |
| 36 | randc = (rand()%NUM_COLORS); |
| 37 | |
| 38 | if (screen->format->BytesPerPixel==1) |
| 39 | { |
| 40 | color = randc; |
| 41 | } |
| 42 | else |
| 43 | { |
| 44 | color = SDL_MapRGB(screen->format, randc, randc, randc); |
| 45 | } |
| 46 | |
| 47 | /* Do it! */ |
| 48 | SDL_FillRect(screen, &area, color); |
| 49 | if ( screen->flags & SDL_DOUBLEBUF ) { |
| 50 | SDL_Flip(screen); |
| 51 | } else { |
| 52 | SDL_UpdateRects(screen, 1, &area); |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | void DrawBackground(SDL_Surface *screen) |
| 57 | { |
| 58 | int i, j, k; |
| 59 | Uint8 *buffer; |
| 60 | Uint16 *buffer16; |
| 61 | Uint16 color; |
| 62 | Uint8 gradient; |
| 63 | |
| 64 | /* Set the surface pixels and refresh! */ |
| 65 | /* Use two loops in case the surface is double-buffered (both sides) */ |
| 66 | |
| 67 | for ( j=0; j<2; ++j ) { |
| 68 | if ( SDL_LockSurface(screen) < 0 ) { |
| 69 | fprintf(stderr, "Couldn't lock display surface: %s\n", |
| 70 | SDL_GetError()); |
| 71 | return; |
| 72 | } |
| 73 | buffer = (Uint8 *)screen->pixels; |
| 74 | |
| 75 | if (screen->format->BytesPerPixel!=2) { |
| 76 | for ( i=0; i<screen->h; ++i ) { |
| 77 | memset(buffer,(i*(NUM_COLORS-1))/screen->h, screen->w * screen->format->BytesPerPixel); |
| 78 | buffer += screen->pitch; |
| 79 | } |
| 80 | } |
| 81 | else |
| 82 | { |
| 83 | for ( i=0; i<screen->h; ++i ) { |
| 84 | gradient=((i*(NUM_COLORS-1))/screen->h); |
| 85 | color = SDL_MapRGB(screen->format, gradient, gradient, gradient); |
| 86 | buffer16=(Uint16*)buffer; |
| 87 | for (k=0; k<screen->w; k++) |
| 88 | { |
| 89 | *(buffer16+k)=color; |
| 90 | } |
| 91 | buffer += screen->pitch; |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | SDL_UnlockSurface(screen); |
| 96 | if ( screen->flags & SDL_DOUBLEBUF ) { |
| 97 | SDL_Flip(screen); |
| 98 | } else { |
| 99 | SDL_UpdateRect(screen, 0, 0, 0, 0); |
| 100 | break; |
| 101 | } |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | SDL_Surface *CreateScreen(Uint16 w, Uint16 h, Uint8 bpp, Uint32 flags) |
| 106 | { |
| 107 | SDL_Surface *screen; |
| 108 | int i; |
| 109 | SDL_Color palette[NUM_COLORS]; |
| 110 | |
| 111 | /* Set the video mode */ |
| 112 | screen = SDL_SetVideoMode(w, h, bpp, flags); |
| 113 | if ( screen == NULL ) { |
| 114 | fprintf(stderr, "Couldn't set display mode: %s\n", |
| 115 | SDL_GetError()); |
| 116 | return(NULL); |
| 117 | } |
| 118 | fprintf(stderr, "Screen is in %s mode\n", |
| 119 | (screen->flags & SDL_FULLSCREEN) ? "fullscreen" : "windowed"); |
| 120 | |
| 121 | if (bpp==8) { |
| 122 | /* Set a gray colormap, reverse order from white to black */ |
| 123 | for ( i=0; i<NUM_COLORS; ++i ) { |
| 124 | palette[i].r = (NUM_COLORS-1)-i * (256 / NUM_COLORS); |
| 125 | palette[i].g = (NUM_COLORS-1)-i * (256 / NUM_COLORS); |
| 126 | palette[i].b = (NUM_COLORS-1)-i * (256 / NUM_COLORS); |
| 127 | } |
| 128 | SDL_SetColors(screen, palette, 0, NUM_COLORS); |
| 129 | } |
| 130 | |
| 131 | return(screen); |
| 132 | } |
| 133 | |
| 134 | int main(int argc, char *argv[]) |
| 135 | { |
| 136 | SDL_Surface *screen; |
| 137 | Uint32 videoflags; |
| 138 | int done; |
| 139 | SDL_Event event; |
| 140 | int width, height, bpp; |
| 141 | |
| 142 | /* Initialize SDL */ |
| 143 | if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { |
| 144 | fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError()); |
| 145 | exit(1); |
| 146 | } |
| 147 | |
| 148 | /* See if we try to get a hardware colormap */ |
| 149 | width = 640; |
| 150 | height = 480; |
| 151 | bpp = 8; |
| 152 | videoflags = SDL_SWSURFACE; |
| 153 | while ( argc > 1 ) { |
| 154 | --argc; |
| 155 | if ( argv[argc-1] && (strcmp(argv[argc-1], "-width") == 0) ) { |
| 156 | width = atoi(argv[argc]); |
| 157 | --argc; |
| 158 | } else |
| 159 | if ( argv[argc-1] && (strcmp(argv[argc-1], "-height") == 0) ) { |
| 160 | height = atoi(argv[argc]); |
| 161 | --argc; |
| 162 | } else |
| 163 | if ( argv[argc-1] && (strcmp(argv[argc-1], "-bpp") == 0) ) { |
| 164 | bpp = atoi(argv[argc]); |
| 165 | --argc; |
| 166 | } else |
| 167 | if ( argv[argc] && (strcmp(argv[argc], "-hw") == 0) ) { |
| 168 | videoflags |= SDL_HWSURFACE; |
| 169 | } else |
| 170 | if ( argv[argc] && (strcmp(argv[argc], "-hwpalette") == 0) ) { |
| 171 | videoflags |= SDL_HWPALETTE; |
| 172 | } else |
| 173 | if ( argv[argc] && (strcmp(argv[argc], "-flip") == 0) ) { |
| 174 | videoflags |= SDL_DOUBLEBUF; |
| 175 | } else |
| 176 | if ( argv[argc] && (strcmp(argv[argc], "-noframe") == 0) ) { |
| 177 | videoflags |= SDL_NOFRAME; |
| 178 | } else |
| 179 | if ( argv[argc] && (strcmp(argv[argc], "-resize") == 0) ) { |
| 180 | videoflags |= SDL_RESIZABLE; |
| 181 | } else |
| 182 | if ( argv[argc] && (strcmp(argv[argc], "-fullscreen") == 0) ) { |
| 183 | videoflags |= SDL_FULLSCREEN; |
| 184 | } else { |
| 185 | fprintf(stderr, "Usage: %s [-width] [-height] [-bpp] [-hw] [-hwpalette] [-flip] [-noframe] [-fullscreen] [-resize]\n", |
| 186 | argv[0]); |
| 187 | exit(1); |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | /* Set a video mode */ |
| 192 | screen = CreateScreen(width, height, bpp, videoflags); |
| 193 | if ( screen == NULL ) { |
| 194 | exit(2); |
| 195 | } |
| 196 | |
| 197 | DrawBackground(screen); |
| 198 | |
| 199 | /* Wait for a keystroke */ |
| 200 | done = 0; |
| 201 | while ( !done && SDL_WaitEvent(&event) ) { |
| 202 | switch (event.type) { |
| 203 | case SDL_MOUSEBUTTONDOWN: |
| 204 | DrawBox(screen, event.button.x, event.button.y, width, height); |
| 205 | break; |
| 206 | case SDL_KEYDOWN: |
| 207 | /* Ignore ALT-TAB for windows */ |
| 208 | if ( (event.key.keysym.sym == SDLK_LALT) || |
| 209 | (event.key.keysym.sym == SDLK_TAB) ) { |
| 210 | break; |
| 211 | } |
| 212 | /* Center the mouse on <SPACE> */ |
| 213 | if ( event.key.keysym.sym == SDLK_SPACE ) { |
| 214 | SDL_WarpMouse(width/2, height/2); |
| 215 | break; |
| 216 | } |
| 217 | /* Toggle fullscreen mode on <RETURN> */ |
| 218 | if ( event.key.keysym.sym == SDLK_RETURN ) { |
| 219 | videoflags ^= SDL_FULLSCREEN; |
| 220 | screen = CreateScreen( |
| 221 | screen->w, screen->h, |
| 222 | screen->format->BitsPerPixel, |
| 223 | videoflags); |
| 224 | if ( screen == NULL ) { |
| 225 | fprintf(stderr, |
| 226 | "Couldn't toggle fullscreen mode\n"); |
| 227 | done = 1; |
| 228 | } |
| 229 | DrawBackground(screen); |
| 230 | break; |
| 231 | } |
| 232 | /* Any other key quits the application... */ |
| 233 | case SDL_QUIT: |
| 234 | done = 1; |
| 235 | break; |
| 236 | case SDL_VIDEOEXPOSE: |
| 237 | DrawBackground(screen); |
| 238 | break; |
| 239 | case SDL_VIDEORESIZE: |
| 240 | screen = CreateScreen( |
| 241 | event.resize.w, event.resize.h, |
| 242 | screen->format->BitsPerPixel, |
| 243 | videoflags); |
| 244 | if ( screen == NULL ) { |
| 245 | fprintf(stderr, |
| 246 | "Couldn't resize video mode\n"); |
| 247 | done = 1; |
| 248 | } |
| 249 | DrawBackground(screen); |
| 250 | break; |
| 251 | default: |
| 252 | break; |
| 253 | } |
| 254 | } |
| 255 | SDL_Quit(); |
| 256 | return(0); |
| 257 | } |