[英]Compilation errors when using GTK2+ with OpenGL?
我正在编写一个使用固定管道 OpenGL 和 FreeGLUT 的 C 程序。 但是,我想使用像 GTK+ 这样的完整工具包而不是 FreeGLUT。 我不能使用 GTK3+,因为它与旧的 OpenGL 代码不兼容,所以我想使用 GTK2+。
我发现这个链接用一个例子程序调用simple.c:
#include <math.h>
#include <gtk/gtk.h>
#include <GL/gl.h>
#include <gtkgl/gtkglarea.h>
int init (GtkWidget *widget)
{
if (gtk_gl_area_make_current (GTK_GL_AREA(widget)))
{
glViewport(0,0, widget->allocation.width, widget->allocation.height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0,100, 100,0, -1,1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
return TRUE;
}
int draw (GtkWidget *widget, GdkEventExpose *event)
{
if (event->count > 0) return TRUE;
if (gtk_gl_area_make_current (GTK_GL_AREA(widget)))
{
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();
gtk_gl_area_swap_buffers (GTK_GL_AREA(widget));
}
return TRUE;
}
int reshape (GtkWidget *widget, GdkEventConfigure *event)
{
if (gtk_gl_area_make_current (GTK_GL_AREA(widget)))
glViewport(0,0, widget->allocation.width, widget->allocation.height);
return TRUE;
}
int main (int argc, char **argv)
{
GtkWidget *window, *glarea;
int attrlist[] = {
GDK_GL_RGBA,
GDK_GL_RED_SIZE,1,
GDK_GL_GREEN_SIZE,1,
GDK_GL_BLUE_SIZE,1,
GDK_GL_DOUBLEBUFFER,
GDK_GL_NONE };
gtk_init (&argc, &argv);
if (gdk_gl_query () == FALSE) return 0;
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW(window), "Simple");
gtk_container_set_border_width (GTK_CONTAINER(window), 10);
g_signal_connect (window, "delete_event",
G_CALLBACK (gtk_main_quit), NULL);
/* You should always delete gtk_gl_area widgets before exit or else
GLX contexts are left undeleted, this may cause problems (=core dump)
in some systems.
Destroy method of objects is not automatically called on exit.
You need to manually enable this feature. Do gtk_quit_add_destroy()
for all your top level windows unless you are certain that they get
destroy signal by other means. */
gtk_quit_add_destroy (1, GTK_OBJECT(window));
glarea = GTK_WIDGET(gtk_gl_area_new (attrlist));
gtk_widget_set_size_request (GTK_WIDGET(glarea), 100, 100);
gtk_widget_set_events (GTK_WIDGET(glarea), GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK);
g_signal_connect (glarea, "expose_event", G_CALLBACK(draw), NULL);
g_signal_connect (glarea, "configure_event", G_CALLBACK(reshape), NULL);
g_signal_connect (glarea, "realize", G_CALLBACK(init), NULL);
gtk_container_add (GTK_CONTAINER(window), GTK_WIDGET(glarea));
gtk_widget_show (GTK_WIDGET(glarea));
gtk_widget_show (GTK_WIDGET(window));
gtk_main ();
return 0;
}
但不幸的是它重新查询了一个我不知道从哪里得到的文件, gtk_opengl.h
我没有成功地尝试编译这个simple.c代码
gcc simple.c -o helloworld `pkg-config --libs gtk+-2.0`
并且,当然,得到了以下错误:
fatal error: gtk_opengl.h: No such file or directory
关于如何使simple.c编译的任何想法? 或者关于如何将 OpenGL 与 GTK2+ 结合起来?
在我的 Debian Stable 机器上,我必须安装libgtkgl2.0-dev
并将--cflags
& gtkgl-2.0
添加到pkg-config
调用中:
gcc simple.c -o helloworld `pkg-config --cflags --libs gtk+-2.0 gtkgl-2.0`
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