Hi again! I figured it out in the meanwhile! Here is the new code. Seems
that whatever I do, the GDK_EXPOSE event is never received, even if I set
the proper event mask (or all events mask). This is a GDK issue, I guess,
not glext. Also, I'll have to figure out a way to make the events block.
Right now it uses up 100% cpu, cause the event function is non-blocking.
Someone said I'll have to use a glib main loop.
Thanks! Hope this helps someone. It just displays a white rectangle on an
orange background.
#include <stdlib.h>
#include <gdk/gdk.h>
#include <gdk/gdkgl.h>
#include <GL/gl.h>
int main(int argc, char **argv) {
gdk_init(&argc, &argv);
gdk_gl_init(&argc, &argv);
int config_attributes[] = {
GDK_GL_DOUBLEBUFFER,
GDK_GL_RGBA,
GDK_GL_RED_SIZE, 1,
GDK_GL_GREEN_SIZE, 1,
GDK_GL_BLUE_SIZE, 1,
GDK_GL_DEPTH_SIZE, 12,
GDK_GL_ATTRIB_LIST_NONE
};
GdkGLConfig *glc = gdk_gl_config_new(config_attributes);
GdkWindowAttr attr;
attr.title = argv[0];
attr.event_mask = GDK_KEY_PRESS_MASK | GDK_STRUCTURE_MASK;
attr.window_type = GDK_WINDOW_TOPLEVEL;
attr.wclass = GDK_INPUT_OUTPUT;
attr.width = 800;
attr.height = 600;
GdkWindow *win = gdk_window_new(NULL, &attr, 0);
gdk_window_show(win);
GdkGLWindow *glwin = NULL;
GdkGLContext *glcontext = NULL;
glwin = gdk_window_set_gl_capability(win, glc, NULL);
glcontext = gdk_gl_context_new(GDK_GL_DRAWABLE(glwin), NULL, true,
GDK_GL_RGBA_TYPE);
printf("glwin=%p glcontext=%p\n", glwin, glcontext);
bool done = false;
while(!done) {
GdkEvent *ev = gdk_event_get();
if(ev) {
switch(ev->type) {
case GDK_MAP:
break;
case GDK_DELETE:
done = true;
break;
case GDK_KEY_PRESS:
printf("key pressed\n");
break;
case GDK_EXPOSE:
printf("got expose\n");
break;
case GDK_CONFIGURE:
if(gdk_gl_drawable_gl_begin(gdk_window_get_gl_drawable(win), glcontext)) {
glViewport(0, 0,
ev->configure.width, ev->configure.height);
if(gdk_gl_drawable_is_double_buffered(gdk_window_get_gl_drawable(win))) {
gdk_gl_drawable_swap_buffers(gdk_window_get_gl_drawable(win));
} else
glFlush();
gdk_gl_drawable_gl_end(gdk_window_get_gl_drawable(win));
}
break;
}
if(gdk_gl_drawable_gl_begin(gdk_window_get_gl_drawable(win), glcontext)) {
glClearColor(1.0, .5, .2,
1.0);
glClear(GL_COLOR_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, 800, 600, 0, -1,
1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glBegin(GL_QUADS);
glVertex2i(100, 100);
glVertex2i(400, 100);
glVertex2i(400, 500);
glVertex2i(100, 500);
glEnd();
if(gdk_gl_drawable_is_double_buffered(gdk_window_get_gl_drawable(win))) {
gdk_gl_drawable_swap_buffers(gdk_window_get_gl_drawable(win));
} else
glFlush();
gdk_gl_drawable_gl_end(gdk_window_get_gl_drawable(win));
}
gdk_event_free(ev);
}
}
gdk_gl_window_destroy(glwin);
gdk_window_destroy(win);
return 0;
}
On Wed, Jul 22, 2009 at 5:08 AM, Mihai Draghicioiu <
[email protected]> wrote:
> Hi guys! I'm trying to make a basic program that just displays a quad, but
> all I get is a black window. Here is my code. Not sure what I'm doing wrong.
> I don't want to use GTK+. I wasn't able to find working GDK + GTKGLExt code
> in the examples.
>
> #include <gdk/gdk.h>
> #include <gdk/gdkgl.h>
> #include <GL/gl.h>
>
> int main(int argc, char **argv) {
> gdk_init(&argc, &argv);
> gdk_gl_init(&argc, &argv);
>
> int config_attributes[] = {
> GDK_GL_DOUBLEBUFFER,
> GDK_GL_RGBA,
> GDK_GL_RED_SIZE, 1,
> GDK_GL_GREEN_SIZE, 1,
> GDK_GL_BLUE_SIZE, 1,
> GDK_GL_DEPTH_SIZE, 12,
> GDK_GL_ATTRIB_LIST_NONE
> };
> GdkGLConfig *glc = gdk_gl_config_new(config_attributes);
>
> GdkWindowAttr attr;
> attr.title = argv[0];
> attr.event_mask = 0;
> attr.window_type = GDK_WINDOW_TOPLEVEL;
> attr.wclass = GDK_INPUT_OUTPUT;
> attr.width = 800;
> attr.height = 600;
> GdkWindow *win = gdk_window_new(NULL, &attr, 0);
>
> GdkGLWindow *glwin = gdk_gl_window_new(glc, win, NULL);
> GdkGLContext *glcontext =
> gdk_gl_context_new(GDK_GL_DRAWABLE(glwin), NULL, true, GDK_GL_RGBA_TYPE);
>
> gdk_window_show(win);
>
> bool done = false;
> while(!done) {
> GdkEvent *ev = gdk_event_get();
> if(ev) {
> switch(ev->type) {
> case GDK_MAP:
>
> gdk_gl_drawable_make_current(GDK_GL_DRAWABLE(glwin), glcontext);
> break;
> case GDK_DELETE:
> done = true;
> break;
> case GDK_EXPOSE:
>
> gdk_gl_drawable_gl_begin(GDK_GL_DRAWABLE(glwin), glcontext);
> glClearColor(1.0, .5, .2, 1.0);
> glClear(GL_COLOR_BUFFER_BIT);
> glMatrixMode(GL_PROJECTION);
> glLoadIdentity();
> glOrtho(0, 800, 600, 0, -1, 1);
> glMatrixMode(GL_MODELVIEW);
> glLoadIdentity();
> glBegin(GL_QUADS);
> glVertex2i(100, 100);
> glVertex2i(400, 100);
> glVertex2i(400, 500);
> glVertex2i(100, 500);
> glEnd();
>
> gdk_gl_drawable_swap_buffers(GDK_GL_DRAWABLE(glwin));
>
> gdk_gl_drawable_gl_end(GDK_GL_DRAWABLE(glwin));
> break;
> }
> gdk_event_free(ev);
> }
> }
>
> gdk_gl_window_destroy(glwin);
> gdk_window_destroy(win);
>
> return 0;
> }
>
>
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