On Tuesday, 4 October 2016 at 17:00:34 UTC, Mike Wey wrote:
Replace "import glgdk.GLContext;" with "import gdk.GLContext;"
Hey Mike, you've been a great help so far! Thank you :)
I thought now I am ready to draw something, but I struggle with
the GLContext and GdkGlContext. Where do I get a valid Context,
or how do I make it valid? My program crashes always with
segmentation fault, as soon as I call a GL function except
glClear.
It must be a problem with the Context... Btw, what exactly is a
GLContext and what is it used for? I am not used to it, since
neither Qt nor glut uses or needs a GLContext-like structure.
Would be great, if you see the error again... I think I am only
missing an initialization function in my "initGL". I didn't find
anything on the Internet. Here my code:
import gtk.Main;
import gtk.MainWindow;
import gtk.GLArea;
import gdk.GLContext;
import derelict.opengl3.gl;
import std.functional : toDelegate;
GLContext initGL(GLArea area) {
DerelictGL3.load();
/* Error happens somewhere here: */
GdkGLContext *gdkCon; /* where do I get a valid "struct
GdkGLContext"?*/
GLContext context = new GLContext(gdkCon); /*needs GdkGLContext
pointer for Initialization*/
context.realize(); /*which of these two functions do I need
really, and why?*/
context.makeCurrent();
/* Runtime Warnings: */
/* Gdk-CRITICAL **: gdk_gl_context_realize:assertion
'GDK_IS_GL_CONTEXT (context)' failed */
/*same for ...make_current...*/
return context;
}
bool renderGL(GLContext context, GLArea area)
{
glClearColor (0, 0, 0, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW); /*Here the program crashes with
Segmentation Fault (Some pointer is NULL)*/
glLoadIdentity();
glColor3f(1.0, 1.0, 0.0);
glBegin(GL_TRIANGLES);
glVertex3f(0, 0, -2);
glVertex3f(1, 0, -2);
glVertex3f(0, 1, -2);
glEnd();
return true;
}
void main(string[] args) {
Main.init(args);
MainWindow win = new MainWindow("Hello GL");
GLArea area = new GLArea();
area.addOnCreateContext(toDelegate(&initGL));
area.addOnRender(toDelegate(&renderGL));
//area.addOnResize(toDelegate(&resizeGL));
win.add(area);
win.showAll();
Main.run();
}
