mitchy_g
November 16th, 2005, 03:20 AM
Hi,
I have been researching how to setup OpenGL on my Breezy box for a few days now. However I have had little success because I am a new to linux and alot of the information I have found is either for Windows or too ambiguos for me to get a sample program running.
So to help solve my problems I started out by installing the following packages:
Mesa 3d:
libgl1-mesa
libgl1-mesa-dev
libglu1-mesa
GL & Others:
glutg3
glutg3-dev
libglui-dev
libglut3
libglut3-dev
My first questions at this point are; Mesa isnt an official release from the creators of OpenGL, is Mesa the only option I have to code somthing that "resembles" opengl in linux?
What is the difference between the glut3 packages and the libglut packages?
Is there anything else I need?
I eventually found this page: HERE (http://www.ece.eps.hw.ac.uk/~dml/cgonline/hyper00/openglcomp.html)
Which shows a few examples of how to use gcc or g++ to compile using Mesa and GLUT using the following in the command line:
# shell script to compile a Mesa program using the glut library
# on a Linux PC using C++
g++ myapp.cpp -lglut -ffast-math -lMesaGLU -lMesaGL -lm -L/usr/X11/lib \
-L/usr/X11R6/lib -lX11 -lXext -lXmu -lXt -lXi -lSM -lICE -o myapp]
however the compiler says that /usr/X11/lib does not exist, so i edited it to where the X11 folder is: /usr/X11R6/lib/X11
I eventually had the thing compiling but linker errors would arise.
THis is the code i was using: Taken from NeHe at gamedev (http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=02)
//
// 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
glTranslatef(-1.5f,0.0f,-6.0f); // Move Left 1.5 Units And Into The Screen 6.0
// draw a triangle
glBegin(GL_POLYGON); // start drawing a polygon
glVertex3f( 0.0f, 1.0f, 0.0f); // Top
glVertex3f( 1.0f,-1.0f, 0.0f); // Bottom Right
glVertex3f(-1.0f,-1.0f, 0.0f); // Bottom Left
glEnd(); // we're done with the polygon
glTranslatef(3.0f,0.0f,0.0f); // Move Right 3 Units
// draw a square (quadrilateral)
glBegin(GL_QUADS); // start drawing a polygon (4 sided)
glVertex3f(-1.0f, 1.0f, 0.0f); // Top Left
glVertex3f( 1.0f, 1.0f, 0.0f); // Top Right
glVertex3f( 1.0f,-1.0f, 0.0f); // Bottom Right
glVertex3f(-1.0f,-1.0f, 0.0f); // Bottom Left
glEnd(); // done with the polygon
// swap buffers to display, since we're double buffered.
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 the soonest we could possibly go fullscreen. */
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;
}
Please guide me if im on the wrong track with the Libs that im using or there if there are errors in my compiling process.
Mitch :smile:
I have been researching how to setup OpenGL on my Breezy box for a few days now. However I have had little success because I am a new to linux and alot of the information I have found is either for Windows or too ambiguos for me to get a sample program running.
So to help solve my problems I started out by installing the following packages:
Mesa 3d:
libgl1-mesa
libgl1-mesa-dev
libglu1-mesa
GL & Others:
glutg3
glutg3-dev
libglui-dev
libglut3
libglut3-dev
My first questions at this point are; Mesa isnt an official release from the creators of OpenGL, is Mesa the only option I have to code somthing that "resembles" opengl in linux?
What is the difference between the glut3 packages and the libglut packages?
Is there anything else I need?
I eventually found this page: HERE (http://www.ece.eps.hw.ac.uk/~dml/cgonline/hyper00/openglcomp.html)
Which shows a few examples of how to use gcc or g++ to compile using Mesa and GLUT using the following in the command line:
# shell script to compile a Mesa program using the glut library
# on a Linux PC using C++
g++ myapp.cpp -lglut -ffast-math -lMesaGLU -lMesaGL -lm -L/usr/X11/lib \
-L/usr/X11R6/lib -lX11 -lXext -lXmu -lXt -lXi -lSM -lICE -o myapp]
however the compiler says that /usr/X11/lib does not exist, so i edited it to where the X11 folder is: /usr/X11R6/lib/X11
I eventually had the thing compiling but linker errors would arise.
THis is the code i was using: Taken from NeHe at gamedev (http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=02)
//
// 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
glTranslatef(-1.5f,0.0f,-6.0f); // Move Left 1.5 Units And Into The Screen 6.0
// draw a triangle
glBegin(GL_POLYGON); // start drawing a polygon
glVertex3f( 0.0f, 1.0f, 0.0f); // Top
glVertex3f( 1.0f,-1.0f, 0.0f); // Bottom Right
glVertex3f(-1.0f,-1.0f, 0.0f); // Bottom Left
glEnd(); // we're done with the polygon
glTranslatef(3.0f,0.0f,0.0f); // Move Right 3 Units
// draw a square (quadrilateral)
glBegin(GL_QUADS); // start drawing a polygon (4 sided)
glVertex3f(-1.0f, 1.0f, 0.0f); // Top Left
glVertex3f( 1.0f, 1.0f, 0.0f); // Top Right
glVertex3f( 1.0f,-1.0f, 0.0f); // Bottom Right
glVertex3f(-1.0f,-1.0f, 0.0f); // Bottom Left
glEnd(); // done with the polygon
// swap buffers to display, since we're double buffered.
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 the soonest we could possibly go fullscreen. */
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;
}
Please guide me if im on the wrong track with the Libs that im using or there if there are errors in my compiling process.
Mitch :smile: