OpenGL Not working......

Ok, so I am trying to do some stuff in OpenGL. I got Visual C++ .net a few months ago, but I haven't tryed opengl with it yet. I was using Dev C++ for a little while and that worked fine compiling opengl code. But when i try to compile the simplest of opengl code with Visual C++ I get an error:

Code:

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fatal error C1010: unexpected end of file while looking for precompiled header directive

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Here is the code I copied from someplace :) :

Code:

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#include <GL/glut.h>
#include "stdlib.h"

#define RAMPSIZE 16
#define RAMP1START 32
#define RAMP2START 48

static float rotAngle = 0.;

/*  Initialize antialiasing for color index mode,
 *  including loading a green color ramp starting
 *  at RAMP1START, and a blue color ramp starting
 *  at RAMP2START. The ramps must be a multiple of 16.
 */
void init(void)
{
  int i;

  for (i = 0; i < RAMPSIZE; i++) {
      GLfloat shade;
      shade = (GLfloat) i/(GLfloat) RAMPSIZE;
      glutSetColor(RAMP1START+(GLint)i, 0., shade, 0.);
      glutSetColor(RAMP2START+(GLint)i, 0., 0., shade);
  }

  glEnable (GL_LINE_SMOOTH);
  glHint (GL_LINE_SMOOTH_HINT, GL_DONT_CARE);
  glLineWidth (1.5);

  glClearIndex ((GLfloat) RAMP1START);
}

/*  Draw 2 diagonal lines to form an X
 */
void display(void)
{
  glClear(GL_COLOR_BUFFER_BIT);

  glIndexi(RAMP1START);
  glPushMatrix();
  glRotatef(-rotAngle, 0.0, 0.0, 0.1);
  glBegin (GL_LINES);
      glVertex2f (-0.5, 0.5);
      glVertex2f (0.5, -0.5);
  glEnd ();
  glPopMatrix();

  glIndexi(RAMP2START);
  glPushMatrix();
  glRotatef(rotAngle, 0.0, 0.0, 0.1);
  glBegin (GL_LINES);
      glVertex2f (0.5, 0.5);
      glVertex2f (-0.5, -0.5);
  glEnd ();
  glPopMatrix();

  glFlush();
}

void reshape(int w, int h)
{
  glViewport(0, 0, (GLsizei) w, (GLsizei) h);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  if (w <= h)
      gluOrtho2D (-1.0, 1.0,
        -1.0*(GLfloat)h/(GLfloat)w, 1.0*(GLfloat)h/(GLfloat)w);
  else
      gluOrtho2D (-1.0*(GLfloat)w/(GLfloat)h,
        1.0*(GLfloat)w/(GLfloat)h, -1.0, 1.0);
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
}

void keyboard(unsigned char key, int x, int y)
{
  switch (key) {
      case 'r':
      case 'R':
        rotAngle += 20.;
        if (rotAngle >= 360.) rotAngle = 0.;
        glutPostRedisplay();       
        break;
      case 27:  /*  Escape Key */
        exit(0);
        break;
      default:
        break;
    }
}

/*  Main Loop
 *  Open window with initial window size, title bar,
 *  color index display mode, and handle input events.
 */
int main(int argc, char** argv)
{
  glutInit(&argc, argv);
  glutInitDisplayMode (GLUT_SINGLE | GLUT_INDEX);
  glutInitWindowSize (200, 200);
  glutCreateWindow (argv[0]);
  init();
  glutReshapeFunc (reshape);
  glutKeyboardFunc (keyboard);
  glutDisplayFunc (display);
  glutMainLoop();
  return 0;
}

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Help me. :(

I'm pretty certain you need to #include <gl/gl.h> to use some of the functions calls you use.

Nah, that didn't work. Can anyone give me some reliable code? Like, some code that intializes an opengl window, in windowed mode. Thanks! Also, do I have to link anything in the configurations to be able to compile opengl programs? I hope not, because I would feel really stupid :( There isn't an SDK is there?

EDIT: BTW I have the latest NVIDIA drivers installed, too.

You have to link OpenGL library files, but that isn't your problem right now. What kind of project are you using for this? It should be a empty windows application. This is looking for precompliled headers which means you aren't using the correct project type for this.

Plus I don't think you can run OpenGL programs like you are trying to do in the console. I don't have a lot of OpenGL experience being a DX guy, but I think you need to make a window, ie. using WinMain() etc.

I am using a win32 project. Also, I even tryed some opengl code that created a window. But when i tryed to compile it. It gave me that same error in my first post. So I DO have to link something. Well, can someone help me out there?

I believe the answer has been duly provided. Read.

www.amazon.com - Get a book about OpenGL.

If you are using GLUT, DON"T USE A WIN32 Project... use a regular console type one. And you probably have to have #include<windows.h> as your FIRST include.

Project -> Settings -> C/C++ Tab
From the drop-down box, select "Precompiled Headers". Now select the radio button that says "Not using precompiled headers".

These steps may vary a little bit depending on what version of MSVC you are using.

In the future, when you create a project, always select Empty Project in the create wizard to avoid this problem.
If you can't find the option bithub mentioned, you can also create a new empty project and import the source files into it.

Ok, I think I got it partially working after I followed a tutorial. Turns out I had to download GLUT, and put the .dll's into the system folder. And the lib and .h in the correct directory. I also linked it in Visual C++. But now when I compile I stuff, i get different errors. I don't get the same error that I mentioned before, so it must have found the .lib and stuff. But I still get some errors.

What errors?

Ok, I used the code from nehe lesson 2. Here are my errors:

Code:

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------ Build started: Project: dfjdj, Configuration: Debug Win32 ------

Linking...
LIBCD.lib(crt0.obj) : error LNK2019: unresolved external symbol _main referenced in function _mainCRTStartup
Debug/dfjdj.exe : fatal error LNK1120: 1 unresolved externals

Build log was saved at "file://c:\Documents and Settings\tony\My Documents\Visual Studio Projects\dfjdj\Debug\BuildLog.htm"
dfjdj - 2 error(s), 0 warning(s)


---------------------- Done ----------------------

    Build: 0 succeeded, 1 failed, 0 skipped

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Here is the tutorial I was using: HERE

It isn't expecting you to use main as your entry point for some reason in the first error.

But main() is there ...
What's your current code? Still exactly the same as in the first post?

No, I said I used nehe's lesson # 2. I downloaded the Visual C++ .net version of the code, if that's correct.

In that case, it's again a project setup problem. You created your project as a console project, which causes VC++ to set the SUBSYSTEM linker switch to CONSOLE and look for a main() as the program entry point. The tutorial, however, expects you to create a standard Win32 project, which causes VC++ to set the SUBSYSTEM linker switch to WINDOWS and look for a WinMain() as the program entry point.

To solve, go to the project options, linker tab, and set SUBSYSTEM to WINDOWS. In the future, create Win32 projects instead of Win32 Console projects, unless you actually want the console.

(I wonder how many billion times I've already answered this one. How do I propose something for a FAQ?)

http://cboard.cprogramming.com/annou...ouncementid=42

Why didn't you tell me this before if you already knew it? :)

Awesome! It finally worked. I wish the **** tutorial would have told me that. :(

Quote:

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Originally Posted by Sentral

Awesome! It finally worked. I wish the **** tutorial would have told me that. :(

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Well, considering that the lessons build on each other (i.e. you're not supposed to do lesson 2 until you've done lesson 1), it DOES tell you that. From Lesson 1:

Quote:

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After you have created a new Win32 Application (NOT a console application) in Visual C++

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I didn't go through the nehe tutorial one. I just used the source from nehe 2. I was referring to the other tutorial i used. It was posted a few posts back.

That's because the code in your first post was written either for Linux or as a Win32 Console application. (It has a main().)