| |
| /* 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: |
| printf("Screen resized to %dx%d\n", event.resize.w, |
| event.resize.h); |
| 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); |
| } |