OpenGL texture loading example

//http://www.youtube.com/user/thecplusplusguy
//multiple texture loading
#include <iostream>
#include <SDL/SDL.h>
#include <SDL/SDL_image.h>
#include <GL/gl.h>
#include <GL/glu.h>

unsigned int loadTexture(const char* name)
{
    SDL_Surface* img=IMG_Load(name);
    SDL_PixelFormat form={NULL,32,4,0,0,0,0,8,8,8,8,0xff000000,0x00ff0000,0x0000ff00,0x000000ff,0,255};
//  std::cout << img->w << " " << img->h << std::endl;
    SDL_Surface* img2=SDL_ConvertSurface(img,&form,SDL_SWSURFACE);
    unsigned int texture;
    glGenTextures(1,&texture);
    glBindTexture(GL_TEXTURE_2D,texture);
    glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,img2->w,img2->h,0,GL_RGBA, GL_UNSIGNED_INT_8_8_8_8,img2->pixels);
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
    std::cout << glGetError() << std::endl;
    SDL_FreeSurface(img);
    SDL_FreeSurface(img2);
    return texture;
}
unsigned int tex[2];
int curTex=0;
void init()
{
    glEnable(GL_TEXTURE_2D);
    glClearColor(0,0,1,1);
    glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluPerspective(50,640.0/480.0,0.1,1000);
    glMatrixMode(GL_MODELVIEW);
    tex[0]=loadTexture("img.png");
    tex[1]=loadTexture("img2.png");

}


void display()
{
    glClear(GL_COLOR_BUFFER_BIT);
    glLoadIdentity();
    glRotatef(180,0,0,1);
    glBindTexture(GL_TEXTURE_2D,tex[curTex]);
    glBegin(GL_QUADS);
        glTexCoord2f(0,1);
        glVertex3f(-2,2,-4);
        glTexCoord2f(0,0);
        glVertex3f(-2,-2,-4);
        glTexCoord2f(1,0);
        glVertex3f(2,-2,-4);
        glTexCoord2f(1,1);
        glVertex3f(2,2,-4);
    glEnd();
}

int main()
{
    SDL_Init(SDL_INIT_EVERYTHING);
    SDL_SetVideoMode(640,480,32,SDL_OPENGL);
    bool running=true;
    SDL_Event event;
    Uint32 start;
    init();
    while(running)
    {
        start=SDL_GetTicks();
        while(SDL_PollEvent(&event))
        {
            switch(event.type)
            {
                case SDL_QUIT:
                    running=false;
                    break;
                case SDL_KEYDOWN:
                    switch(event.key.keysym.sym)
                    {
                        case SDLK_ESCAPE:
                            running=false;
                            break;
                        case SDLK_SPACE:
                            curTex=!curTex;
                            break;
                    }
                    break;
                case SDL_MOUSEBUTTONDOWN:
                    break;
            }
        }
        display();
        //SDL_BlitSurface(img2,NULL,screen,NULL);
        //SDL_Flip(screen);
        SDL_GL_SwapBuffers();
        if(1000.0/30>(SDL_GetTicks()-start))
            SDL_Delay(1000.0/30-(SDL_GetTicks()-start));
    }
    SDL_Quit();
}