Mercurial > sdl-ios-xcode
view test/graywin.c @ 1488:29ea15e37aea
Eric is setting up X11 support for the XCode project
author | Sam Lantinga <slouken@libsdl.org> |
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date | Thu, 09 Mar 2006 13:25:43 +0000 |
parents | d33645c36072 |
children | 782fd950bd46 c121d94672cb |
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/* Simple program: Fill a colormap with gray and stripe it down the screen */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <time.h> #include "SDL.h" #ifdef TEST_VGA16 /* Define this if you want to test VGA 16-color video modes */ #define NUM_COLORS 16 #else #define NUM_COLORS 256 #endif /* Draw a randomly sized and colored box centered about (X,Y) */ void DrawBox(SDL_Surface *screen, int X, int Y, int width, int height) { static unsigned int seeded = 0; SDL_Rect area; Uint32 color; Uint32 randc; /* Seed the random number generator */ if ( seeded == 0 ) { srand(time(NULL)); seeded = 1; } /* Get the bounds of the rectangle */ area.w = (rand()%width); area.h = (rand()%height); area.x = X-(area.w/2); area.y = Y-(area.h/2); randc = (rand()%NUM_COLORS); if (screen->format->BytesPerPixel==1) { color = randc; } else { color = SDL_MapRGB(screen->format, randc, randc, randc); } /* Do it! */ SDL_FillRect(screen, &area, color); if ( screen->flags & SDL_DOUBLEBUF ) { SDL_Flip(screen); } else { SDL_UpdateRects(screen, 1, &area); } } void DrawBackground(SDL_Surface *screen) { int i, j, k; Uint8 *buffer; Uint16 *buffer16; Uint16 color; Uint8 gradient; /* Set the surface pixels and refresh! */ /* Use two loops in case the surface is double-buffered (both sides) */ for ( j=0; j<2; ++j ) { if ( SDL_LockSurface(screen) < 0 ) { fprintf(stderr, "Couldn't lock display surface: %s\n", SDL_GetError()); return; } buffer = (Uint8 *)screen->pixels; if (screen->format->BytesPerPixel!=2) { for ( i=0; i<screen->h; ++i ) { memset(buffer,(i*(NUM_COLORS-1))/screen->h, screen->w * screen->format->BytesPerPixel); buffer += screen->pitch; } } else { for ( i=0; i<screen->h; ++i ) { gradient=((i*(NUM_COLORS-1))/screen->h); color = SDL_MapRGB(screen->format, gradient, gradient, gradient); buffer16=(Uint16*)buffer; for (k=0; k<screen->w; k++) { *(buffer16+k)=color; } buffer += screen->pitch; } } SDL_UnlockSurface(screen); if ( screen->flags & SDL_DOUBLEBUF ) { SDL_Flip(screen); } else { SDL_UpdateRect(screen, 0, 0, 0, 0); break; } } } SDL_Surface *CreateScreen(Uint16 w, Uint16 h, Uint8 bpp, Uint32 flags) { SDL_Surface *screen; int i; SDL_Color palette[NUM_COLORS]; /* Set the video mode */ screen = SDL_SetVideoMode(w, h, bpp, flags); if ( screen == NULL ) { fprintf(stderr, "Couldn't set display mode: %s\n", SDL_GetError()); return(NULL); } fprintf(stderr, "Screen is in %s mode\n", (screen->flags & SDL_FULLSCREEN) ? "fullscreen" : "windowed"); if (bpp==8) { /* Set a gray colormap, reverse order from white to black */ for ( i=0; i<NUM_COLORS; ++i ) { palette[i].r = (NUM_COLORS-1)-i * (256 / NUM_COLORS); palette[i].g = (NUM_COLORS-1)-i * (256 / NUM_COLORS); palette[i].b = (NUM_COLORS-1)-i * (256 / NUM_COLORS); } SDL_SetColors(screen, palette, 0, NUM_COLORS); } return(screen); } int main(int argc, char *argv[]) { SDL_Surface *screen; Uint32 videoflags; int done; SDL_Event event; int width, height, bpp; /* Initialize SDL */ if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError()); exit(1); } /* See if we try to get a hardware colormap */ width = 640; height = 480; bpp = 8; videoflags = SDL_SWSURFACE; while ( argc > 1 ) { --argc; if ( argv[argc-1] && (strcmp(argv[argc-1], "-width") == 0) ) { width = atoi(argv[argc]); --argc; } else if ( argv[argc-1] && (strcmp(argv[argc-1], "-height") == 0) ) { height = atoi(argv[argc]); --argc; } else if ( argv[argc-1] && (strcmp(argv[argc-1], "-bpp") == 0) ) { bpp = atoi(argv[argc]); --argc; } else if ( argv[argc] && (strcmp(argv[argc], "-hw") == 0) ) { videoflags |= SDL_HWSURFACE; } else if ( argv[argc] && (strcmp(argv[argc], "-hwpalette") == 0) ) { videoflags |= SDL_HWPALETTE; } else if ( argv[argc] && (strcmp(argv[argc], "-flip") == 0) ) { videoflags |= SDL_DOUBLEBUF; } else if ( argv[argc] && (strcmp(argv[argc], "-noframe") == 0) ) { videoflags |= SDL_NOFRAME; } else if ( argv[argc] && (strcmp(argv[argc], "-resize") == 0) ) { videoflags |= SDL_RESIZABLE; } else if ( argv[argc] && (strcmp(argv[argc], "-fullscreen") == 0) ) { videoflags |= SDL_FULLSCREEN; } else { fprintf(stderr, "Usage: %s [-width] [-height] [-bpp] [-hw] [-hwpalette] [-flip] [-noframe] [-fullscreen] [-resize]\n", argv[0]); exit(1); } } /* Set a video mode */ screen = CreateScreen(width, height, bpp, videoflags); if ( screen == NULL ) { exit(2); } DrawBackground(screen); /* Wait for a keystroke */ done = 0; while ( !done && SDL_WaitEvent(&event) ) { switch (event.type) { case SDL_MOUSEBUTTONDOWN: DrawBox(screen, event.button.x, event.button.y, width, height); break; case SDL_KEYDOWN: /* Ignore ALT-TAB for windows */ if ( (event.key.keysym.sym == SDLK_LALT) || (event.key.keysym.sym == SDLK_TAB) ) { break; } /* Center the mouse on <SPACE> */ if ( event.key.keysym.sym == SDLK_SPACE ) { SDL_WarpMouse(width/2, height/2); break; } /* Toggle fullscreen mode on <RETURN> */ if ( event.key.keysym.sym == SDLK_RETURN ) { videoflags ^= SDL_FULLSCREEN; screen = CreateScreen( screen->w, screen->h, screen->format->BitsPerPixel, videoflags); if ( screen == NULL ) { fprintf(stderr, "Couldn't toggle fullscreen mode\n"); done = 1; } DrawBackground(screen); break; } /* Any other key quits the application... */ case SDL_QUIT: done = 1; break; case SDL_VIDEOEXPOSE: DrawBackground(screen); break; case SDL_VIDEORESIZE: screen = CreateScreen( event.resize.w, event.resize.h, screen->format->BitsPerPixel, videoflags); if ( screen == NULL ) { fprintf(stderr, "Couldn't resize video mode\n"); done = 1; } DrawBackground(screen); break; default: break; } } SDL_Quit(); return(0); }