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52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
/* $Revision$ */
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#include <SDL.h>
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#include <stdlib.h>
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#include "sdl.h"
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SDL_Surface* sdl_init() {
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SDL_Surface* screen;
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screen = SDL_SetVideoMode(WIDTH, HEIGHT, 8, SDL_SWSURFACE);
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if(screen == NULL) {
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fprintf(stderr, "Unable to set video mode: %s\n",
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SDL_GetError());
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exit(1);
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}
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return screen;
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}
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void sdl_putpixel(SDL_Surface *surface, int x, int y, Uint32 pixel)
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{
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int bpp = surface->format->BytesPerPixel;
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/* Here p is the address to the pixel we want to set */
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Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
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switch(bpp) {
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case 1:
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*p = pixel;
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break;
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case 2:
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*(Uint16 *)p = pixel;
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break;
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case 3:
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if(SDL_BYTEORDER == SDL_BIG_ENDIAN) {
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p[0] = (pixel >> 16) & 0xff;
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p[1] = (pixel >> 8) & 0xff;
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p[2] = pixel & 0xff;
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} else {
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p[0] = pixel & 0xff;
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p[1] = (pixel >> 8) & 0xff;
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p[2] = (pixel >> 16) & 0xff;
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}
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break;
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case 4:
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*(Uint32 *)p = pixel;
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break;
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}
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}
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