Hello everyone,

I'm learning Nehe tutorials and I came across with an error: "entry point must be defined" file: "LINK"

This is my code:

#include <Windows.h>
#include <gl\GL.h>
#include <gl\GLU.h>
#include <gl\GLAux.h>

HGLRC           hRC = NULL;                        
HDC             hDC = NULL;

bool keys[256];
bool active = TRUE;
bool fullscreen = TRUE;

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

GLvoid ReSizeGLScene(GLsizei width, GLsizei height)
{
	if (height == 0)
	{
		height = 1;
	}

	glViewport(0, 0, width, height);
	glMatrixMode(GL_PROJECTION);                        
	glLoadIdentity();                           

	
	gluPerspective(45.0f, (GLfloat)width / (GLfloat)height, 0.1f, 100.0f);

	glMatrixMode(GL_MODELVIEW);                   
	glLoadIdentity();                        
}

int InitGL(GLvoid){
	glShadeModel(GL_SMOOTH);
	glClearColor(1.0f, 1.0f, 1.0f, 0.0f);
	glClearDepth(1.0f);
	glEnable(GL_DEPTH_TEST);
	glDepthFunc(GL_LEQUAL);
	glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
	return TRUE;
}

Help me to figure it out please

The "entry point" is also known as main function. Under Windows this is usually WinMain(…), while under unixes it is usually main(…). Without such a function anywhere within your code, the compiler does not know what to call when the OS hands over program execution to your executable. Either you complete the shown code snippet by an appropriate main function, or else you need to compile it as object file and link it with another object file where the main function was compiled into.

The "entry point" is also known as main function. Under Windows this is usually WinMain(…), while under unixes it is usually main(…). Without such a function anywhere within your code, the compiler does not know what to call when the OS hands over program execution to your executable. Either you complete the shown code snippet by an appropriate main function, or else you need to compile it as object file and link it with another object file where the main function was compiled into.

I still not sure what to do. if you could explain me in more details I will be very glad.

Thank you

I would recommend downloading the finished code that you can find at the end of each tutorial, and comparing it to your code.

I still not sure what to do. if you could explain me in more details I will be very glad.

Telling you what exactly to do requires knowledge of your project set-up. Moreover I'm not a Windows programmer but one working under Unix.

However, in principle you need to implement a function WinMain (because you're building a Windows executable). The legacy NeHe tutorials have this function explained in tutorial 01, and I assume that the tutorials you are following have this, too. Later tutorials may have dropped it for clarity, but when you download the tutorial instead of copying it from screen you probably found WinMain therein. I don't know which tutorials / source you are following, so I cannot hint you exactly where to look.

EDIT: Being ninja'd twice… ;)

Thanks everyone

Also NeHe's tutorials are SEVERELY outdated to the point of being completely irrelevant today.

There are better modern tutorials out there.

For example:

http://www.arcsynthesis.org/gltut/