sdl_surface_simple-00.c

gistfile1.c

#include <stdio.h>
#include "SDL.h"

struct {
        SDL_Surface* gfx;
        SDL_Rect rect;
        SDL_Rect screen_pos;
        int dir;
} guy;

static int running = 1;

void handle_input() {

        SDL_Event event;

        while (SDL_PollEvent(&event)) {
                switch (event.type) {

                case SDL_QUIT:
                        running = 0;
                        return;

                case SDL_KEYDOWN:
                        if (event.key.keysym.sym == SDLK_ESCAPE) {
                                running = 0;
                                return;
                        }

                        break;

                case SDL_MOUSEMOTION:
                        break;

                default:
                        break; /* unknown event type */
                }
        }

}

void update() {
        if (0==guy.dir) {
                ++guy.screen_pos.x;
                if (guy.screen_pos.x == 800) {
                        guy.dir = 1;
                }
                return;
        }

        if (1==guy.dir) {
                --guy.screen_pos.x;
                if (guy.screen_pos.x == 0) {
                        guy.dir = 0;
                }
                return;
        }
}

void render_frame(SDL_Surface* screen) {
        Uint32 color_black = SDL_MapRGB(screen->format, 0, 0, 0);
        SDL_FillRect(screen, NULL, color_black);
        SDL_BlitSurface(guy.gfx,
                        &guy.rect,
                        screen,
                        &guy.screen_pos);
}

int main(int argc, char* argv[]) {

        SDL_Surface* screen = NULL;
        const Uint32 flags =  SDL_ANYFORMAT | SDL_FULLSCREEN | SDL_HWSURFACE | SDL_DOUBLEBUF;
        const int w = 800;
        const int h = 600;

        SDL_Init(SDL_INIT_VIDEO);

        guy.dir = 0;
        guy.screen_pos.x = 0;
        guy.screen_pos.y = 200;
        guy.rect.x = 0;
        guy.rect.y = 0;
        guy.rect.w = 64;
        guy.rect.h = 64;
        guy.gfx = SDL_LoadBMP("guy_64x64.bmp"); /* SDL_ConvertSurface() */

        screen = SDL_SetVideoMode(w, h, 0, flags);

        printf("SDL_ANYFORMAT:%d\n",   (Uint32)(screen->flags & SDL_ANYFORMAT));
        printf("SDL_ASYNCBLIT:%d\n",   (Uint32)(screen->flags & SDL_ASYNCBLIT));
        printf("SDL_DOUBLEBUF:%d\n",   (Uint32)(screen->flags & SDL_DOUBLEBUF));
        printf("SDL_HWACCEL:%d\n",     (Uint32)(screen->flags & SDL_HWACCEL));
        printf("SDL_HWPALETTE:%d\n",   (Uint32)(screen->flags & SDL_HWPALETTE));
        printf("SDL_HWSURFACE:%d\n",   (Uint32)(screen->flags & SDL_HWSURFACE));
        printf("SDL_FULLSCREEN:%d\n",  (Uint32)(screen->flags & SDL_FULLSCREEN));
        printf("SDL_OPENGL:%d\n",      (Uint32)(screen->flags & SDL_OPENGL));
        printf("SDL_OPENGLBLIT:%d\n",  (Uint32)(screen->flags & SDL_OPENGLBLIT));
        printf("SDL_RESIZABLE:%d\n",   (Uint32)(screen->flags & SDL_RESIZABLE));
        printf("SDL_RLEACCEL:%d\n",    (Uint32)(screen->flags & SDL_RLEACCEL));
        printf("SDL_SRCALPHA:%d\n",    (Uint32)(screen->flags & SDL_SRCALPHA));
        printf("SDL_SRCCOLORKEY:%d\n", (Uint32)(screen->flags & SDL_SRCCOLORKEY));
        printf("SDL_SWSURFACE:%d\n",   (Uint32)(screen->flags & SDL_SWSURFACE));
        printf("SDL_PREALLOC:%d\n",    (Uint32)(screen->flags & SDL_PREALLOC));

        while (running) {
                handle_input();
                update();
                render_frame(screen);
                SDL_Flip(screen);
        }


        SDL_FreeSurface(guy.gfx);

        SDL_FreeSurface(screen);
        SDL_Quit();

        return 0;
}