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

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

    SDL_Surface *screen = NULL, *lines[600] = {NULL};
    SDL_Rect position;
    int i = 0;
    int couleur1[3] = {0,0,0};
    int couleur2[3] = {255,255,255};
    int differences[3] = {0};
    int r = 0, g = 0, b = 0;

    differences[0] = (couleur2[0] - couleur1[0]) / 600;
    differences[1] = (couleur2[1] - couleur1[1]) / 600;
    differences[2] = (couleur2[2] - couleur1[2]) / 600;

    SDL_Init(SDL_INIT_VIDEO);

    screen = SDL_SetVideoMode(800, 600, 32, SDL_HWSURFACE);

    for (i; i < 600 ; i++)
    {
        lines[i] = SDL_CreateRGBSurface(SDL_HWSURFACE, 800, 1, 32, 0, 0, 0, 0);
    }

    SDL_WM_SetCaption("Algo dégradé", NULL);

    SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, 2, 114, 125));

    for (i = 0 ; i < 600 ; i++)
    {

        r = couleur1[0] + (differences[0] * i);
        g = couleur1[1] + (differences[1] * i);
        b = couleur1[2] + (differences[2] * i);

        position.x = 0;
        position.y = i;
        SDL_FillRect(lines[i], NULL, SDL_MapRGB(screen->format, r, g, b));
        SDL_BlitSurface(lines[i], NULL, screen, &position);
    }

    SDL_Flip(screen);
    sleep();

    for (i = 0 ; i <= 600 ; i++)
        SDL_FreeSurface(lines[i]);

    SDL_Quit();

    return EXIT_SUCCESS;
}

void sleep()
{
    int window = 1;
    SDL_Event event;

    while (window)
    {
        SDL_WaitEvent(&event);
        switch(event.type)
        {
            case SDL_QUIT:
                window= 0;
        }
    }
}