Keskustelu: Ohjelmointikysymykset: C++: SDL & OpenGL ongelma

#include <SDL/SDL.h>
#include <SDL/SDL_opengl.h>
#include <cmath>

//milliseconds per frame tai jotain sen suuntaista
#define WANTED_MSPF 50

//screen-surfeissi
SDL_Surface *screen;

//aikasäädöt
static Uint32 wanha,uusi;

//pelin sisälläololoopin tarkistusbittisäätöjutskafoo
bool ingame;

//vähän niinku viewport, emt
class camera {
	public:
		int x,y,w,h,s;
		void translate();
		camera();
		~camera();
};

void camera::translate() {
	glLoadIdentity();

}

camera::camera() {
}

camera::~camera() {
}
//ukkeli, eli sellane viiva
class dude {
	public:
		int x,y,a;
		void draw(camera Kamera);
		dude();
		dude(int x,int y);
		~dude();
};
//piirtofunktio
void dude::draw(camera Kamera) {
	glBegin(GL_LINES);
		glVertex3i(x,y,0);
		glVertex3i(x+(cos(a)*10),y+(sin(a)*10),0);
	glEnd();
}

dude::dude() {
}

dude::dude(int x,int y) {
}

dude::~dude() {
}

//tyypit
dude dudes[10];
camera viewiportti;

SDL_Event tapahtuma;

Uint8 *napit;

void handleEvents() {
	SDL_PollEvent(&tapahtuma);
	if (tapahtuma.type==SDL_QUIT) exit(0);
}


//aika kesken TODO: cos&sinfunktiosäädöt
void handleKeyPresses() {
	napit=SDL_GetKeyState(NULL);
	if(napit[SDLK_UP]) dudes[0].y--;
	if(napit[SDLK_DOWN]) dudes[0].y++;
	if(napit[SDLK_LEFT]) dudes[0].x--;
	if(napit[SDLK_RIGHT]) dudes[0].x++;
	if(napit[SDLK_ESCAPE]) ingame=false;
}
//funktio jonka pitäis piirtää sälät näytölle
void drawStuff() {
	for(int i=0;i<10;i++)
		dudes[i].draw(viewiportti);
}

//ladataan säädöt
void loadglstuff() {
	glViewport(0,0,800,600);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(45.0f,800.0f/600.0f,0.1f,100.0f);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();

	viewiportti.x=0;
	viewiportti.y=0;
	viewiportti.w=800;
	viewiportti.h=600;
	viewiportti.s=0;

	for(int i=0;i<10;i++)
		dudes[i] = dude(i,i);
}

int main(int argc,char *argv[]) {
	printf("Starting...\n");
	if(SDL_Init(SDL_INIT_VIDEO)) {
		fprintf(stderr,"SDL didn't work! %s\n",SDL_GetError());
		exit(1);
	}
	atexit(SDL_Quit);

	screen=SDL_SetVideoMode(800,600,0,SDL_FULLSCREEN|SDL_OPENGL);
	printf("Screen has been set.\n");

	SDL_GL_SetAttribute(SDL_GL_RED_SIZE,8);
	SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE,8);
	SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE,8);
	SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE,16);
	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER,1);
	printf("Attributes have been set.\n");

	glShadeModel(GL_SMOOTH);
	glClearColor(0.0f,0.0f,0.0f,0.0f);
	glClearDepth(1.0f);
	glEnable(GL_DEPTH_TEST);
	glDepthFunc(GL_LEQUAL);
	glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
	loadglstuff();
	printf("GL funcs have been set.\n");
	ingame=true;

	while(ingame) {
		drawStuff();

		SDL_GL_SwapBuffers();
		//Wait a second.
		wanha=uusi;
		handleKeyPresses();
		handleEvents();
		while((uusi-wanha)<WANTED_MSPF) {
			//handleKeyPresses();
			//handleEvents();
			uusi=SDL_GetTicks();
		}
	}

	exit(1);
	return 0;
}