simple nehe tutorial question on making a window in linux

HTML · 2003-11-27T19:32:58

// // This code was created by Jeff Molofee '99 (ported to Linux/GLUT by Richard Campbell '99) // // If you've found this code useful, please let me know. // // Visit me at www.demonews.com/hosted/nehe // (email Richard Campbell at ulmont@bellsouth.net) // #include <GL/glut.h> // Header File For The GLUT Library #include <GL/gl.h> // Header File For The OpenGL32 Library #include <GL/glu.h> // Header File For The GLu32 Library #include <unistd.h> // Header file for sleeping. /* ascii code for the escape key */ #define ESCAPE 27 /* The number of our GLUT window */ int window; /* A general OpenGL initialization function. Sets all of the initial parameters. */ void InitGL(int Width, int Height) // We call this right after our OpenGL window is created. { glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // This Will Clear The Background Color To Black glClearDepth(1.0); // Enables Clearing Of The Depth Buffer glDepthFunc(GL_LESS); // The Type Of Depth Test To Do glEnable(GL_DEPTH_TEST); // Enables Depth Testing glShadeModel(GL_SMOOTH); // Enables Smooth Color Shading glMatrixMode(GL_PROJECTION); glLoadIdentity(); // Reset The Projection Matrix gluPerspective(45.0f,(GLfloat)Width/(GLfloat)Height,0.1f,100.0f); // Calculate The Aspect Ratio Of The Window glMatrixMode(GL_MODELVIEW); } /* The function called when our window is resized (which shouldn't happen, because we're fullscreen) */ void ReSizeGLScene(int Width, int Height) { if (Height==0) // Prevent A Divide By Zero If The Window Is Too Small Height=1; glViewport(0, 0, Width, Height); // Reset The Current Viewport And Perspective Transformation glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(45.0f,(GLfloat)Width/(GLfloat)Height,0.1f,100.0f); glMatrixMode(GL_MODELVIEW); } /* The main drawing function. */ void DrawGLScene() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer glLoadIdentity(); // Reset The View // since this is double buffered, swap the buffers to display what just got drawn. glutSwapBuffers(); } /* The function called whenever a key is pressed. */ void keyPressed(unsigned char key, int x, int y) { /* avoid thrashing this procedure */ usleep(100); /* If escape is pressed, kill everything. */ if (key == ESCAPE) { /* shut down our window */ glutDestroyWindow(window); /* exit the program...normal termination. */ exit(0); } } int main(int argc, char **argv) { /* Initialize GLUT state - glut will take any command line arguments that pertain to it or X Windows - look at its documentation at http://reality.sgi.com/mjk/spec3/spec3.html */ glutInit(&argc, argv); /* Select type of Display mode: Double buffer RGBA color Alpha components supported Depth buffer */ glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_ALPHA | GLUT_DEPTH); /* get a 640 x 480 window */ glutInitWindowSize(640, 480); /* the window starts at the upper left corner of the screen */ glutInitWindowPosition(0, 0); /* Open a window */ window = glutCreateWindow("Jeff Molofee's GL Code Tutorial ... NeHe '99"); /* Register the function to do all our OpenGL drawing. */ glutDisplayFunc(&DrawGLScene); /* Go fullscreen. This is as soon as possible. */ glutFullScreen(); /* Even if there are no events, redraw our gl scene. */ glutIdleFunc(&DrawGLScene); /* Register the function called when our window is resized. */ glutReshapeFunc(&ReSizeGLScene); /* Register the function called when the keyboard is pressed. */ glutKeyboardFunc(&keyPressed); /* Initialize our window. */ InitGL(640, 480); /* Start Event Processing Engine */ glutMainLoop(); return 1; } It seems to be giving me an error: main.cpp:91: error: `exit' undeclared (first use this function) main.cpp:91: error: (Each undeclared identifier is reported only once for each function it appears in.) Also... I am just trying to get a window to put some text and graphics in...I was wondering how I would do that. Maybe make a text file for the window to refer to? Or could I just add the code (text game)? thanks and thank you to the authors of the code [edited by - HTML on November 18, 2003 9:17:30 PM]

MrScout

120

November 22, 2003 02:33 AM

The only way that I could give a quick example would be to know which IDE you were using. The IDE will have a compile or link time options. It has to.

But no.. I can't give a quick example. The best thing I can say is .. "tell me which IDE you're using and maybe I'll find out how to tell it to link against certain libraries".

The real best thing to do is to actually go to their website or read the docs. Those will tell you how to link. you see, the problem that you're having is that the compiler can't find the functions you're calling - because they're in the library!

Summary:
#1: Read the docs, find out how to link libraries with your projects
#2: Post which IDE you're using and maybe I'll figure it out by proxy and docs.

Scout

BTW... learn to compile things in the console.. there's plenty of stuff out there that still requires it. :-/ This is neither good nor bad, it simply is.

All polynomials are funny - some to a higher degree.
Furthermore, polynomials of degree zero are constantly funny.

[edited by - MrScout on November 22, 2003 3:36:06 AM]

All polynomials are funny - some to a higher degree.Furthermore, polynomials of degree zero are constantly funny.

HTML

Author

151

November 22, 2003 04:42 PM

ok, well I am using KDevelop

MrScout

120

November 22, 2003 06:36 PM

http://www.kdevelop.org/doc/manual/index-9.html

I need say no more than this. ;-)

If you still can''t figure it out i may have to actually d/l kdevelop and see. :-/ I don''t have kde installed and this might be a hassle. But I''m confident the website will help you.

Scout

All polynomials are funny - some to a higher degree.
Furthermore, polynomials of degree zero are constantly funny.

All polynomials are funny - some to a higher degree.Furthermore, polynomials of degree zero are constantly funny.

HTML

Author

151

November 26, 2003 11:46 AM

Ok, I figured out how to link the libraries finally. THanks

But would you know why I would get this error when compiling nehe''s opengl window for linux sdl??

g++: cannot specify -o with -c or -S and multiple compilacations

thats all I get, so if I fix that, I may be able to finally make a window

Thanks

MrScout

120

November 27, 2003 07:32 PM

quote:
Original post by HTML
Ok, I figured out how to link the libraries finally. THanks

But would you know why I would get this error when compiling nehe''s opengl window for linux sdl??

g++: cannot specify -o with -c or -S and multiple compilacations

thats all I get, so if I fix that, I may be able to finally make a window

Thanks

Because you can''t. You might try to compile the various source files seperately.
g++ -c -g bob.C
g++ -c -g bob2.C
g++ -o main bob.o bob2.o
(this is a normal compile sequence)

What is probably trying to happen is something like this:
g++ -c bob.C bob2.C -o main

Well.. you''re compiling bob.C and bob2.C and trying to put *BOTH* of their outputs into main! (object files) You obviously couldn''t make sense of that.

Thus, a possible solution:
g++ bob.C bob2.C -o main (I don''t compile this way, but suspect it works.)

The -c flag specifies compile only - it only creates a .o file...
Without the -c flag it will continue through the whole process...

Thus, ... you''re still compiling wrong!

All polynomials are funny - some to a higher degree.
Furthermore, polynomials of degree zero are constantly funny.

All polynomials are funny - some to a higher degree.Furthermore, polynomials of degree zero are constantly funny.

simple nehe tutorial question on making a window in linux

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