My ubuntu version is 16.04, and I first installed mesa-common-dev, libgl1-mesa-dev, libglm-dev, libegl1-mesa-dev. Then I installed NVIDIA-Linux-x86_64-440.64.run with opengl support.
But when I tried to run a toy example, I keep getting this error main: Assertion display != EGL_NO_DISPLAY failed
/* Compile with gcc -g3 -o example example.c -lX11 -lEGL */
#include <assert.h>
#include <stdio.h>
#include <EGL/egl.h>
#include <EGL/eglplatform.h>
void printEGLError();
int main(void) {
Display* x_display = XOpenDisplay(NULL);
EGLDisplay display = eglGetDisplay(x_display);
// EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
assert(display != EGL_NO_DISPLAY);
EGLint major, minor;
eglInitialize(display, &major, &minor);
char *string = eglQueryString(display, EGL_CLIENT_APIS);
assert(string);
printf("%s\n", string);
return 0;
}
/* Use printEGLError to show a description of the last EGL Error.
The descriptions are taken from the eglGetError manual */
#define ERROR_DESC(...) fprintf(stderr, "%s\n", __VA_ARGS__); break
void printEGLError() {
switch(eglGetError()) {
case(EGL_SUCCESS):
ERROR_DESC("The last function succeeded without error.");
case(EGL_NOT_INITIALIZED):
ERROR_DESC("EGL is not initialized, or could not be initialized, for the specified EGL display connection.");
case(EGL_BAD_ACCESS):
ERROR_DESC("EGL cannot access a requested resource (for example a context is bound in another thread).");
case(EGL_BAD_ALLOC):
ERROR_DESC("EGL failed to allocate resources for the requested operation.");
case(EGL_BAD_ATTRIBUTE):
ERROR_DESC("An unrecognized attribute or attribute value was passed in the attribute list.");
case(EGL_BAD_CONTEXT):
ERROR_DESC("An EGLContext argument does not name a valid EGL rendering context.");
case(EGL_BAD_CONFIG):
ERROR_DESC("An EGLConfig argument does not name a valid EGL frame buffer configuration.");
case(EGL_BAD_CURRENT_SURFACE):
ERROR_DESC("The current surface of the calling thread is a window, pixel buffer or pixmap that is no longer valid.");
case(EGL_BAD_DISPLAY):
ERROR_DESC("An EGLDisplay argument does not name a valid EGL display connection.");
case(EGL_BAD_SURFACE):
ERROR_DESC("An EGLSurface argument does not name a valid surface (window, pixel buffer or pixmap) configured for GL rendering.");
case(EGL_BAD_MATCH):
ERROR_DESC("Arguments are inconsistent (for example, a valid context requires buffers not supplied by a valid surface).");
case(EGL_BAD_PARAMETER):
ERROR_DESC("One or more argument values are invalid.");
case(EGL_BAD_NATIVE_PIXMAP):
ERROR_DESC("A NativePixmapType argument does not refer to a valid native pixmap.");
case(EGL_BAD_NATIVE_WINDOW):
ERROR_DESC("A NativeWindowType argument does not refer to a valid native window.");
case(EGL_CONTEXT_LOST):
ERROR_DESC("A power management event has occurred. The application must destroy all contexts and reinitialise OpenGL ES state and objects to continue rendering. ");
}
}
More Information: my graphics card is Titan Xp and I tried to run sudo servide lightdm stop and removed all possible remote desktop softwares. But the problem still exists. Anyone could help?
For those who may be confused about this problem, just unset DISPLAY. This may save your day.