Question

I am learning OpenGL these days, and I tried to compile the example code on the book(OpenGL SuperBible)

The code likes this: first use glEnable(GL_LINE_STIPPLE) to open the GL_LINE_STIPPLE, and then glLineStipple(2, (GLushort)0x00ff), last I draw some lines, but when executed, it just displayed the normal lines. (in Ubuntu)

However, I compiled the same code in windows, it worked!!

Why? Are there any different details between Windows and Linux?

#include <QtGui>
#include "GLWidget.h"
GLWidget::GLWidget(QWidget *parent)
    : QGLWidget(parent)
{
    setFormat(QGLFormat(QGL::DoubleBuffer));
}
GLWidget::~GLWidget()
{
}
void GLWidget::initializeGL()
{
    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
    glEnable(GL_LINE_STIPPLE);
}
void GLWidget::resizeGL(int w, int h)
{
    if(h == 0)
        h = 1;
    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(-100, 100, -100, 100, -1, +1);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}
void GLWidget::paintGL()
{
    glClear(GL_COLOR_BUFFER_BIT);
    drawLine();
}
void GLWidget::drawLine()
{
    GLint factor = 1;
    GLushort pattern = 0x00ff;
    glColor3f(1.0f, 1.0f, 1.0f);
    for(GLfloat i = -90.0f; i < 90.0f; i += 20.0f)
    {
        glLineStipple(factor, pattern);
        glLineWidth(5.0);
        glBegin(GL_LINES);
            glVertex2f(-80.0f, i);
            glVertex2f(+80.0f, i);
        glEnd();
        factor++;
    }
}

Answer 1

I’ve seen from your comment answer to @Lefteris that you’re using the Mesa3D/DRI based “radeon” driver. I suggest you download AMD’s propritary driver (fglrx) fron their website, install that and try again.