Gtkglext and gtkglarea gtk3 windows does not work - opengl

Question

I need to get working gtk3 with vtk6.
Ive just built (after some effort) gtkglext for gtk3.
Later I built vtkmm1.2 with the win32 patches and I do not see vtk widget.
Due to this, I discovered I cant see any draw in the gtkglext examples.
On the other side, Ive tried the excellent example of gtkglarea (the new, gtk built in one ) with plain opengl from https://www.bassi.io/articles/2015/02/17/using-opengl-with-gtk/
and I get no draw because "fb setup not supported".
It seems the framebuffer is complete, checking gtkglarea.c.
How can i solve this?
Anyone have been able to draw something in gtk with opengl, for windows?
This is the simplest code i've made,and i'm getting the mentioned error enter image description here, and adapting the signals to the new built in GtkGLArea ("render" instead of "draw")
#include <math.h>
#include <gtk/gtk.h>
//#include <gtkgl/gtkglarea.h> //LUCIANO, gtkglarea is built in now
#include <gtk/gtkglarea.h>
#include <GL/gl.h>
gint init(GtkWidget *widget)
{
/* OpenGL functions can be called only if make_current returns true */
gtk_gl_area_make_current(GTK_GL_AREA(widget));
{
GtkAllocation allocation;
gtk_widget_get_allocation (widget, &allocation);
glViewport(0, 0, allocation.width, allocation.height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0,100, 100,0, -1,1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
return TRUE;
}
/* When widget is exposed it's contents are redrawn. */
gboolean draw (GtkWidget *widget, cairo_t *cr, gpointer data)
{
/* OpenGL functions can be called only if make_current returns true */
gtk_gl_area_make_current(GTK_GL_AREA(widget));
{
/* Draw simple triangle */
glClearColor(0,0,0,1);
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1,1,1);
glBegin(GL_TRIANGLES);
glVertex2f(10,10);
glVertex2f(10,90);
glVertex2f(90,90);
glEnd();
/* Swap backbuffer to front */
//ggla_area_swap_buffers(GGLA_AREA(widget));
gtk_gl_area_attach_buffers(GTK_GL_AREA(widget));
}
return TRUE;
}
/* When glarea widget size changes, viewport size is set to match the new size */
gint reshape(GtkWidget *widget, GdkEventConfigure *event)
{
/* OpenGL functions can be called only if make_current returns true */
//if (ggla_area_make_current(GTK_GL_AREA(widget)))
gtk_gl_area_make_current(GTK_GL_AREA(widget));
{
GtkAllocation allocation;
gtk_widget_get_allocation (widget, &allocation);
glViewport(0, 0, allocation.width, allocation.height);
}
return TRUE;
}
int main(int argc, char **argv)
{
GtkWidget *window,*glarea;
gchar *info_str;
/* Attribute list for gtkglarea widget. Specifies a
list of Boolean attributes and enum/integer
attribute/value pairs. The last attribute must be
GGLA_NONE. See glXChooseVisual manpage for further
explanation.
*/
int attrlist[] = {
// GGLA_RGBA,
// GGLA_RED_SIZE,1,
// GGLA_GREEN_SIZE,1,
// GGLA_BLUE_SIZE,1,
// GGLA_DOUBLEBUFFER,
// GGLA_NONE
};
/* initialize gtk */
gtk_init(&argc, &argv);
/* Check if OpenGL is supported. */
// if (ggla_query() == FALSE) {
// g_print("OpenGL not supported\n");
// return 0;
// }
/* Create new top level window. */
window = gtk_window_new( GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window), "Simple");
gtk_container_set_border_width(GTK_CONTAINER(window), 10);
/* Quit form main if got delete event */
g_signal_connect(G_OBJECT(window), "delete-event",
G_CALLBACK(gtk_main_quit), NULL);
/* Create new OpenGL widget. */
//glarea = GTK_WIDGET(gtk_gl_area_new(attrlist));
glarea = gtk_gl_area_new();
/* Events for widget must be set before X Window is created */
gtk_widget_set_events(GTK_WIDGET(glarea),
GDK_EXPOSURE_MASK|
GDK_BUTTON_PRESS_MASK);
init(glarea);
/* Connect signal handlers */
/* Redraw image when exposed. */
// g_signal_connect(G_OBJECT(glarea), "draw",
// G_CALLBACK(draw), NULL);
// /* When window is resized viewport needs to be resized also. */
// g_signal_connect(G_OBJECT(glarea), "configure-event",
// G_CALLBACK(reshape), NULL);
// /* Do initialization when widget has been realized. */
// g_signal_connect(G_OBJECT(glarea), "realize",
// G_CALLBACK(init), NULL);
g_signal_connect(G_OBJECT(glarea), "render",
G_CALLBACK(draw), NULL);
/* When window is resized viewport needs to be resized also. */
// g_signal_connect(G_OBJECT(glarea), "resize",
// G_CALLBACK(reshape), NULL);
/* Do initialization when widget has been realized. */
// g_signal_connect(G_OBJECT(glarea), "create-context",
// G_CALLBACK(init), NULL);
/* set minimum size */
gtk_widget_set_size_request(GTK_WIDGET(glarea), 100,100);
/* put glarea into window and show it all */
gtk_container_add(GTK_CONTAINER(window),GTK_WIDGET(glarea));
gtk_widget_show(GTK_WIDGET(glarea));
gtk_widget_show(GTK_WIDGET(window));
/* vendor dependent version info string */
// info_str = ggla_get_info();
// g_print(info_str);
// g_free(info_str);
gtk_main();
return 0;
}