When I try to run an example from Erco's web page example I get this:
http://f.imagehost.org/0170/opengl_error.jpg
Here is the example:
#ifdef _WIN32
#include <windows.h>
#endif
#include <math.h>
#include <FL/Fl.h>
#include <FL/Fl_Window.h>
#include <FL/Fl_Gl_Window.h>
#include <FL/gl.h>
#include <FL/glut.h>
//
// Render a simple opengl shaded sphere with a single side light -- erco
11/28/08
// NOTE: Glut needed *only* for glutSolidSphere()
//
class MyGlWindow : public Fl_Gl_Window {
public:
// RESHAPE THE VIEWPORT
void Reshape(GLfloat W, GLfloat H) {
// (REFERENCE: SGI light.c DEMO)
GLfloat ratio = W / H;
glViewport(0, 0, (GLsizei)W, (GLsizei)H);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.5*ratio, 1.5*ratio, -1.5, 1.5, -10.0, 10.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void draw() {
if (!valid()) {
valid(1);
Reshape(w(), h());
// (REFERENCE: SGI 'light.c' EXAMPLE)
GLfloat mat_ambient[] = { 1.0, 1.0, 1.0, 1.0 }; // RGBA
GLfloat mat_diffuse[] = { 1.0, 1.0, 1.0, 1.0 }; // RGBA
GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 }; // RGBA
GLfloat light_position[] = { 5.0, 5.0, 0.0, 0.0 }; // XYZ
glClearColor(0.0, 0.0, 0.4, 0.0); // bg color
glShadeModel(GL_SMOOTH);
//
glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
glMaterialf(GL_FRONT, GL_SHININESS, 20.0);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
//
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_DEPTH_TEST);
}
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glColor3f(0.5, 0.5, 0.5);
glutSolidSphere(0.5, 30, 30);
glPopMatrix();
}
// CTOR
MyGlWindow(int X,int Y,int W,int H,const char*L=0) :
Fl_Gl_Window(X,Y,W,H,L) {
}
};
int main() {
Fl_Window win(640, 480, "sphere");
MyGlWindow mygl(10, 10, win.w()-20, win.h()-20);
win.resizable(&mygl);
win.show();
return(Fl::run());
}
I do get this kind of errors with all FLTK OpenGl programs!
Is this a bug or somethig is bad in my system?
I run on my laptop Slackware Linux 12.2, my video drivers are instaled (Intel
GM965). And I have tried the example with FLTK2 too, the same problem.
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