I started to learn game programming using C++ and SDL few days ago.
I built a simple program which loads a map of tiles and a simple character that moves around.
The problem is that the program is really laggy. It is caused by the updating process of the map on the screen. Once every loop the program display each tile of the map, 300 of them (20x15).
Does it caused by the image format?
There is any other way to do display the tile map without lag? Any SDL function I dont know, perhaps a method to display?
I'm displaying the map using the next functions:
//update the screenvoid updateDisplay() { loadMap(level.map); loadBMP(player.image, player.x * 32, player.y * 32); SDL_Flip(screen);}//load a map to the screenvoid loadMap(int map[15][20]) { for(int y=0; y < 15; y++) { for(int x=0; x < 20; x++) { drawTile(map[y][x],x,y); } }}//check which image to draw for a tilevoid drawTile(int tile,int x, int y) { switch(tile) { case 0: loadBMP("tile0.bmp",x*32,y*32); break; case 1: loadBMP("tile1.bmp",x*32,y*32); break; case 2: loadBMP("tile2.bmp",x*32,y*32); break; }}//load a .BMP file to the screenvoid loadBMP(char* file_name, int x, int y) { SDL_Surface *image = NULL; image = SDL_LoadBMP(file_name); if(image == NULL) { return; } image = SDL_DisplayFormat(image); SDL_Rect src, dest; src.x = 0; src.y = 0; src.w = image->w; src.h = image->h; dest.x = x; dest.y = y; dest.w = image->w; dest.h = image->h; SDL_BlitSurface(image, &src, screen, &dest); SDL_FreeSurface(image);}also I use "SDL_Delay(5);" at the end of the main loop.
What can I do?
[Edited by - yoni0505 on December 12, 2010 11:53:51 AM]
