X11和NVIDIA驱动程序的奇怪EGL行为

我目前有一个奇怪的问题，我使用GTK2，OpenGL和EGL的示例应用程序。我描述的奇怪行为仅在Linux的Nvidia GPU上与官方NVIDIA驾驶员发生。在程序中，您会看到注释，如果您此时不使用glFlush或glGetError，则代码不会绘制三角形，它将仅显示红色(透明颜色(。如果您致电glGetError或glFlush，则可以工作。

有人可以向我解释为什么会发生这种情况吗？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)
{
    EGLConfig egl_config;
    EGLint n_config;
    EGLint attributes[] = { EGL_SURFACE_TYPE, EGL_WINDOW_BIT, 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);
    egl_surface = eglCreateWindowSurface (egl_display, egl_config, GDK_WINDOW_XID (gtk_widget_get_window (widget)), NULL);
    eglBindAPI (EGL_OPENGL_API);   
    egl_context = eglCreateContext (egl_display, egl_config, EGL_NO_CONTEXT, NULL);
    eglMakeCurrent(egl_display, egl_surface, egl_surface, egl_context);
    printf("GL Version: %sn", glGetString(GL_VERSION));
}
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)
{
    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 (1, 0, 0, 1);
    glClearDepth(1.0);
    glClear (GL_COLOR_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 ();
    /****************************
     * It does not matter if you call glGetError or glFlush here, if you do, it
     * works, if not, it only displays a red surface
     ****************************/
    //glGetError();
    //glFlush();
    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_after (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;
}

与：

g++ -o gtkegl gtkegl.cc -lEGL -lGL $(pkg-config --libs --cflags gtk+-2.0) -lX11