Hi created a small example code reproducing my problem...
With my understanding, This code is suppose to create one windows called "Test
Window" contianing 2 OpenGL Windows.
At each draw of the openGl window, it prints out "GL Draw".
But when running my code, I only see 2 "GL_Draw" print outs, comming from
GL1->draw(); and GL2->draw();.
In any case, nothing is drawn on the "Test Window".
I likeli miss an important point here,
I checked over the documentation but didn't find obvious things...
So you help is really welcome here...
Loic,
class WIN_GL : public Fl_Gl_Window {
public:
WIN_GL(int x,int y,int w,int h,const char *l=0) :
Fl_Gl_Window(x,y,w,h,l){}
void Perspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble
zFar) {
GLdouble xmin, xmax, ymin, ymax;
ymax = zNear * tan(fovy * 3.141516 / 360.0);
ymin = -ymax;
xmin = ymin * aspect;
xmax = ymax * aspect;
glFrustum(xmin, xmax, ymin, ymax, zNear, zFar);
}
void draw(){
std::cout << "GL DRAW\n";
if ( !valid() ) {
valid(1);
// Viewport
glViewport(0, 0, w(), h());
// Projection
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
GLfloat ratio = w() / h();
Perspective(30.0f, 1.0f*ratio, 1.0f, 30.0f);
glTranslatef(0.0, 0.0, -8.0);
// Model view
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
glClearColor(.9,.9,.9, 1.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Setup model matrix
glLoadIdentity();
static float spin = 0.0f;
spin+=0.5f;
glRotatef(spin, 0.5f, 1.0f, 0.0f); // show all sides of cube
// Draw cube with texture assigned to each face
glBegin(GL_QUADS);
// Front Face
glColor3f(1.0, 0.0, 0.0); // red
glVertex3f(-1.0, 1.0, 1.0); // Top Left Of The Texture and Quad
glVertex3f( 1.0, 1.0, 1.0); // Top Right Of The Texture and Quad
glVertex3f( 1.0, -1.0, 1.0); // Bottom Right Of The Texture and
Quad
glVertex3f(-1.0, -1.0, 1.0); // Bottom Left Of The Texture and
Quad
// Back Face
glColor3f(0.0, 1.0, 1.0); // cyn
glVertex3f( 1.0, 1.0, -1.0); // Top Left Of The Texture and Quad
glVertex3f(-1.0, 1.0, -1.0); // Top Right Of The Texture and Quad
glVertex3f(-1.0, -1.0, -1.0); // Bottom Right Of The Texture and
Quad
glVertex3f( 1.0, -1.0, -1.0); // Bottom Left Of The Texture and
Quad
// Top Face
glColor3f(0.0, 1.0, 0.0); // grn
glVertex3f(-1.0, 1.0, -1.0); // Top Left Of The Texture and Quad
glVertex3f( 1.0, 1.0, -1.0); // Top Right Of The Texture and Quad
glVertex3f( 1.0, 1.0, 1.0); // Bottom Right Of The Texture and
Quad
glVertex3f(-1.0, 1.0, 1.0); // Bottom Left Of The Texture and
Quad
// Bottom Face
glColor3f(1.0, 0.0, 1.0); // mag
glVertex3f( 1.0, -1.0, -1.0); // Top Left Of The Texture and Quad
glVertex3f(-1.0, -1.0, -1.0); // Top Right Of The Texture and Quad
glVertex3f(-1.0, -1.0, 1.0); // Bottom Right Of The Texture and
Quad
glVertex3f( 1.0, -1.0, 1.0); // Bottom Left Of The Texture and
Quad
// Right face
glColor3f(0.0, 0.0, 1.0); // blu
glVertex3f( 1.0, 1.0, 1.0); // Top Left Of The Texture and Quad
glVertex3f( 1.0, 1.0, -1.0); // Top Right Of The Texture and Quad
glVertex3f( 1.0, -1.0, -1.0); // Bottom Right Of The Texture and
Quad
glVertex3f( 1.0, -1.0, 1.0); // Bottom Left Of The Texture and
Quad
// Left Face
glColor3f(1.0, 1.0, 0.0); // yel
glVertex3f(-1.0, 1.0, -1.0); // Top Left Of The Texture and Quad
glVertex3f(-1.0, 1.0, 1.0); // Top Right Of The Texture and Quad
glVertex3f(-1.0, -1.0, 1.0); // Bottom Right Of The Texture and
Quad
glVertex3f(-1.0, -1.0, -1.0); // Bottom Left Of The Texture and
Quad
glEnd();
}
int handle(int e){
return Fl_Gl_Window::handle(e);
}
};
class WIN_MAIN : public Fl_Double_Window {
public:
WIN_GL* GL1;
WIN_GL* GL2;
WIN_MAIN(int x,int y,int w,int h,const char *l=0) :
Fl_Double_Window(x,y,w,h,l)
{
this->begin();
GL1 = new WIN_GL(10,10,(w-30)/2, (y-20));
GL1->end();
GL1->show();
GL1->draw();
GL1->resizable(this);
this->begin();
GL2 = new WIN_GL(20+(w-30)/2,10,(w-30)/2, (y-20));
GL2->end();
GL2->show();
GL2->draw();
GL2->resizable(this);
this->end();
}
};
int main (int argc, char *argv[])
{
WIN_MAIN* test = new WIN_MAIN(0,0,800,600,"Test Window");
test->resizable(test);
test->show();
while(test->shown()){
Fl::check();
//test->damage(FL_DAMAGE_ALL);
test->redraw();
}
return 0;
}
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