Question

我编写了随附的示例程序，该程序将GTK2与EGL和OpenGL结合使用。在我的系统上，这很好。在朋友的PC上，它只会产生一个黑色的窗口，而我不能指望为什么会这样。我们对加载哪些库的事件进行跟踪（哪个是相同的）。我的PC使用NVIDIA MX150，他使用GTX 1030，他使用Debian Strech，而我使用Debian buster。

我不能专心解决这个问题。无论如何，这是代码：

#include <stdio.h>
#include <gtk/gtk.h>
#include <gdk/gdkx.h>
#include <EGL/egl.h>
#include <GL/gl.h>

static EGLDisplay egl_display;
static EGLSurface egl_surface;
static EGLContext egl_context;

static void realize_cb (GtkWidget *widget)
{
    printf("REALIZE\n");
    EGLConfig egl_config;
    EGLint n_config;
    EGLint attributes[] = { EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
                            EGL_NONE };
    EGLint surf_attrs[] = {
        EGL_RENDER_BUFFER, EGL_BACK_BUFFER,
        EGL_NONE
    };

    egl_display = eglGetDisplay ((EGLNativeDisplayType) gdk_x11_display_get_xdisplay (gtk_widget_get_display (widget)));
    eglInitialize (egl_display, NULL, NULL);
    eglChooseConfig (egl_display, attributes, &egl_config, 1, &n_config);
    eglBindAPI (EGL_OPENGL_API);
    egl_surface = eglCreateWindowSurface (egl_display, egl_config, GDK_WINDOW_XID (gtk_widget_get_window (widget)), surf_attrs);
    egl_context = eglCreateContext (egl_display, egl_config, EGL_NO_CONTEXT, NULL);
}

static gboolean on_configure (GtkWidget *widget, GdkEvent *event, gpointer user_data)
{
    gtk_widget_queue_draw(widget);
    return FALSE;
}

static gboolean draw_cb (GtkWidget *widget, GdkEventExpose *expose, gpointer userdata)
{
    printf("DRAW\n");
    eglMakeCurrent (egl_display, egl_surface, egl_surface, egl_context);

    GtkAllocation alloc;
    gtk_widget_get_allocation(widget, &alloc);
    glViewport (0, 0, alloc.width, alloc.height);

    glClearColor (0, 0, 0, 1);
    glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glMatrixMode (GL_PROJECTION);
    glLoadIdentity ();
    glOrtho (0, 100, 0, 100, 0, 1);

    glBegin (GL_TRIANGLES);
    glColor3f (1, 0, 0);
    glVertex2f (50, 10);
    glColor3f (0, 1, 0);
    glVertex2f (90, 90);
    glColor3f (0, 0, 1);
    glVertex2f (10, 90);
    glEnd ();

    eglSwapBuffers (egl_display, egl_surface);

    return TRUE;
}

int main (int argc, char **argv)
{
    GtkWidget *w;

    gtk_init (&argc, &argv);

    w = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    gtk_widget_set_double_buffered (GTK_WIDGET (w), FALSE);
    g_signal_connect (G_OBJECT (w), "realize", G_CALLBACK (realize_cb), NULL);
    g_signal_connect (G_OBJECT (w), "expose-event", G_CALLBACK (draw_cb), NULL);
    g_signal_connect (G_OBJECT (w), "configure-event", G_CALLBACK (on_configure), NULL);
    gtk_widget_show (w);

    gtk_main ();

    return 0;
}

EGL和OpenGL仅产生黑屏

0 个答案: