SDL程序的编译

如何编译：
例子中的代码同时引用了SDL和GL库，需要通过 sdl-config --lib --cflags 或-lSDL 加入SDL库 , -lGL 加入GL库

引用:
引用: http://pbeblog.wordpress.com/2009/02/16/compile-sdlopengl-applications-using-g/
g++ sourcefile.cpp -o output -lSDL -lGL 或者
g++ sourcefile.cpp -o output `sdl-config --libs --cflags` -lGL -lGLU

Sample code:
引用:
这段代码是画一个圆。在ubuntu下运行成功

// g++ me.cpp -lSDL -lGL

#include <math.h>
#include <GL/gl.h>
#include <SDL/SDL.h>

#define RAD2DEG 0.0174532925

void init(int width, int height)
{
    // Initialize SDL
    const SDL_VideoInfo* info = NULL;
    SDL_Init(SDL_INIT_VIDEO);
    info = SDL_GetVideoInfo();
    int vidFlags = SDL_OPENGL | SDL_GL_DOUBLEBUFFER;
    if (info->hw_available) {vidFlags |= SDL_HWSURFACE;}
    else {vidFlags |= SDL_SWSURFACE;}
    SDL_SetVideoMode(width, height, info->vfmt->BitsPerPixel, vidFlags);

    // Initialize OpenGL for 2d
    glViewport( 0, 0, width, height );
    glMatrixMode( GL_PROJECTION );
    glOrtho( 0, width, height, 0, -1, 1 );
    glMatrixMode( GL_MODELVIEW );
   glDisable(GL_DEPTH_TEST);
}

void glCircle(GLint x, GLint y, GLint r)
{
   float step = 360.0 / (2.0*M_PI*r);
   glPushMatrix();
   glTranslatef(x, y, 0);
   glBegin(GL_TRIANGLE_FAN);
   glVertex2i(0, 0);
   for(float i=0; i<360; i+=step)
   {
      glVertex2i((GLint)(cos(RAD2DEG*i)*r), (GLint)(sin(RAD2DEG*i)*r));
   }
   glEnd();
   glPopMatrix();
}

int main()
{
   init(640, 480);
   glClear(GL_COLOR_BUFFER_BIT);
    glLoadIdentity();
   glCircle(200, 200, 100);
    SDL_GL_SwapBuffers();
    SDL_Delay(2000);
}