[SDL] SDL fullscreen problem

[cocobear]

于 Tue, 4 Sep 2007 10:35:08 +0200 (CEST)
"Torsten Giebl" <wizard at syntheticsw.com> 写道:

> Hello !
> 
> 
> >> When I run a program  in X system on F7 ,the X crashed ,just like I
> >> press
> >> CTRL+ALT+BACKSPACE.
> >> It is sure that the code has no problem,I get it from linux game
> >> programming.
> >> What's the problem?
> >>
> >>
> >> the code is below,
> >>
> >> #include <SDL/SDL.h>
> >> #include <stdio.h>
> >> #include <stdlib.h>
> 
> Use #include "SDL.h" and use it after stdio.h and stdlib.h
> 


I should use #include "SDL/SDL.h",because if I use "SDL.h",the GCC
could't find SDL.h
My SDL.h is in /usr/include/SDL/SDL.h



> >> Uint16 CreateHicolorPixel(SDL_PixelFormat * fmt, Uint8 red,
> >>                           Uint8 green, Uint8 blue)
> >> {
> >>     Uint16 value;
> 
> You use Uint16 but you are running with SDL_SetVideoMode (..,24,..)
> so better use a Uint32 for pixel values.
> 
> >>     value = ((red >> fmt->Rloss) << fmt->Rshift) +
> >>             ((green >> fmt->Gloss) << fmt->Gshift) +
> >>             ((blue >> fmt->Bloss) << fmt->Bshift);
> >>     return value;
> >> }
> 
> Better use the SetPixel function from the SDL website.
> 
> >> int main()
> 
> To be portable do int main(int argc, char *argv [])
> 

Good advice.


> >> {
> >>     SDL_Surface *screen;
> >>     Uint16 *raw_pixels;
> >>     int x, y;
> >>    if (SDL_Init(SDL_INIT_VIDEO) != 0) {
> >>        printf("Unable to initialize SDL: %s\n", SDL_GetError());
> >>        return 1;
> >>    }
> >>    atexit(SDL_Quit);
> >>    screen = SDL_SetVideoMode(256, 256, 24,
> >> SDL_FULLSCREEN|SDL_SWSURFACE);
> >>    if (screen == NULL) {
> >>        printf("Unable to set video mode: %s\n", SDL_GetError());
> >>        return 1;
> >>    }
> 
> Do an if SDL_MUSTLOCK (screen) true then only lock the surface.
> 
> >>    SDL_LockSurface(screen);
> >>    raw_pixels = (Uint16 *) screen->pixels;
> >>    for (x = 0; x < 256; x++) {
> >>        for (y = 0; y < 256; y++) {
> >>            Uint16 pixel_color;
> >>            int offset;
> >>            pixel_color = CreateHicolorPixel(screen->format,
> >>                                           x, 0, y);
> >>            offset = (screen->pitch / 2 * y + x);
> >>            raw_pixels[offset] = pixel_color;
> >>         }
> >>     }
> >>     SDL_UnlockSurface(screen);
> 
> The same with SDL_MUSTLOCK as above
> 
> >>     SDL_UpdateRect(screen, 10, 10, 200, 120);
> >>     SDL_Delay(3000);
> >>     return 0;
> >>  }
> 
> 
> CU
> 

Thanks for you reply,but the problem is when I set SDL to the
fullscreen mode , the X system will crashed. Even if I do nothing,just
set it fullscreen.

#include <stdlib.h>
#include "SDL/SDL.h"

int main(int argc, char* argv[])
{
    SDL_Surface *screen;
    if (SDL_Init(SDL_INIT_VIDEO) != 0) {
        printf("Unable to initialize SDL: %s\n", SDL_GetError());
        return 1;
    }
    atexit(SDL_Quit);
    screen = SDL_SetVideoMode(640, 480, 16, SDL_FULLSCREEN);
    if (screen == NULL) {
        printf("Unable to set video mode: %s\n", SDL_GetError());
        return 1;
    }
    printf("Success!\n");
    return 0;
}


When I run this simple code , the X crashed too!

Does it the bug of SDL?

My os is Fedora 7.



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