I am using EGL 1.4 to bind to the OpenGL API under X11.
With the nvidia driver version 384.145, this works as expected. But using driver versions 390.30 and 396.37 results in a black window.
The issue occurs on two laptops with different nvidia CPU (Quadro K1100M, NVS4200M) using the driver from the CUDA repository on Ubuntu 16.04. With driver version 396, eglQueryString(display, EGL_CLIENT_APIS) also returns an empty string.
Did the behaviour change in between these driver versions? I cannot find relevant information in the driver release notes.
This minimal example “egltri” (adapted from the es2tri mesa demo at es2tri.c\opengles2\egl\src - mesa/demos - A collection of OpenGL / Mesa demos and test programs. (mirrored from https://gitlab.freedesktop.org/mesa/demos) ) demonstrates the problem. When working correctly, it draws a coloured triangle whose orientation changes with the up/down keys. However, with driver versions 390.30 and 396.37, only a black window is drawn.
// file: egltri.c
// gcc egltri.c -o egltri -lEGL -lm -lGL -lX11 -DUSE_FULL_GL=1
#ifndef USE_FULL_GL
#define USE_FULL_GL 1
#endif
#include <assert.h>
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/keysym.h>
#if USE_FULL_GL
#ifdef __APPLE__
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#else
#include <GL/gl.h>
#include <GL/glu.h>
#endif
#ifndef GLAPIENTRY
#define GLAPIENTRY
#endif
#else
#include <GLES2/gl2.h> /* use OpenGL ES 2.x */
#endif
#include <EGL/egl.h>
#define FLOAT_TO_FIXED(X) ((X) * 65535.0)
static GLfloat view_rotx = 0.0, view_roty = 0.0;
static GLint u_matrix = -1;
static GLint attr_pos = 0, attr_color = 1;
static void
make_z_rot_matrix(GLfloat angle, GLfloat *m)
{
float c = cos(angle * M_PI / 180.0);
float s = sin(angle * M_PI / 180.0);
int i;
for (i = 0; i < 16; i++)
m[i] = 0.0;
m[0] = m[5] = m[10] = m[15] = 1.0;
m[0] = c;
m[1] = s;
m[4] = -s;
m[5] = c;
}
static void
make_scale_matrix(GLfloat xs, GLfloat ys, GLfloat zs, GLfloat *m)
{
int i;
for (i = 0; i < 16; i++)
m[i] = 0.0;
m[0] = xs;
m[5] = ys;
m[10] = zs;
m[15] = 1.0;
}
static void
mul_matrix(GLfloat *prod, const GLfloat *a, const GLfloat *b)
{
#define A(row,col) a[(col<<2)+row]
#define B(row,col) b[(col<<2)+row]
#define P(row,col) p[(col<<2)+row]
GLfloat p[16];
GLint i;
for (i = 0; i < 4; i++) {
const GLfloat ai0=A(i,0), ai1=A(i,1), ai2=A(i,2), ai3=A(i,3);
P(i,0) = ai0 * B(0,0) + ai1 * B(1,0) + ai2 * B(2,0) + ai3 * B(3,0);
P(i,1) = ai0 * B(0,1) + ai1 * B(1,1) + ai2 * B(2,1) + ai3 * B(3,1);
P(i,2) = ai0 * B(0,2) + ai1 * B(1,2) + ai2 * B(2,2) + ai3 * B(3,2);
P(i,3) = ai0 * B(0,3) + ai1 * B(1,3) + ai2 * B(2,3) + ai3 * B(3,3);
}
memcpy(prod, p, sizeof(p));
#undef A
#undef B
#undef PROD
}
static void
draw(void)
{
static const GLfloat verts[3][2] = {
{ -1, -1 },
{ 1, -1 },
{ 0, 1 }
};
static const GLfloat colors[3][3] = {
{ 1, 0, 0 },
{ 0, 1, 0 },
{ 0, 0, 1 }
};
GLfloat mat[16], rot[16], scale[16];
/* Set modelview/projection matrix */
make_z_rot_matrix(view_rotx, rot);
make_scale_matrix(0.5, 0.5, 0.5, scale);
mul_matrix(mat, rot, scale);
glUniformMatrix4fv(u_matrix, 1, GL_FALSE, mat);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
{
glVertexAttribPointer(attr_pos, 2, GL_FLOAT, GL_FALSE, 0, verts);
glVertexAttribPointer(attr_color, 3, GL_FLOAT, GL_FALSE, 0, colors);
glEnableVertexAttribArray(attr_pos);
glEnableVertexAttribArray(attr_color);
glDrawArrays(GL_TRIANGLES, 0, 3);
glDisableVertexAttribArray(attr_pos);
glDisableVertexAttribArray(attr_color);
}
}
/* new window size or exposure */
static void
reshape(int width, int height)
{
glViewport(0, 0, (GLint) width, (GLint) height);
}
static void
create_shaders(void)
{
static const char *fragShaderText =
"precision mediump float;\n"
"varying vec4 v_color;\n"
"void main() {\n"
" gl_FragColor = v_color;\n"
"}\n";
static const char *vertShaderText =
"uniform mat4 modelviewProjection;\n"
"attribute vec4 pos;\n"
"attribute vec4 color;\n"
"varying vec4 v_color;\n"
"void main() {\n"
" gl_Position = modelviewProjection * pos;\n"
" v_color = color;\n"
"}\n";
GLuint fragShader, vertShader, program;
GLint stat;
fragShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragShader, 1, (const char **) &fragShaderText, NULL);
glCompileShader(fragShader);
glGetShaderiv(fragShader, GL_COMPILE_STATUS, &stat);
if (!stat) {
printf("Error: fragment shader did not compile!\n");
exit(1);
}
vertShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertShader, 1, (const char **) &vertShaderText, NULL);
glCompileShader(vertShader);
glGetShaderiv(vertShader, GL_COMPILE_STATUS, &stat);
if (!stat) {
printf("Error: vertex shader did not compile!\n");
exit(1);
}
program = glCreateProgram();
glAttachShader(program, fragShader);
glAttachShader(program, vertShader);
glLinkProgram(program);
glGetProgramiv(program, GL_LINK_STATUS, &stat);
if (!stat) {
char log[1000];
GLsizei len;
glGetProgramInfoLog(program, 1000, &len, log);
printf("Error: linking:\n%s\n", log);
exit(1);
}
glUseProgram(program);
if (1) {
/* test setting attrib locations */
glBindAttribLocation(program, attr_pos, "pos");
glBindAttribLocation(program, attr_color, "color");
glLinkProgram(program); /* needed to put attribs into effect */
}
else {
/* test automatic attrib locations */
attr_pos = glGetAttribLocation(program, "pos");
attr_color = glGetAttribLocation(program, "color");
}
u_matrix = glGetUniformLocation(program, "modelviewProjection");
printf("Uniform modelviewProjection at %d\n", u_matrix);
printf("Attrib pos at %d\n", attr_pos);
printf("Attrib color at %d\n", attr_color);
}
static void
init(void)
{
typedef void (*proc)();
#if 1 /* test code */
proc p = eglGetProcAddress("glMapBufferOES");
assert(p);
#endif
glClearColor(0.4, 0.4, 0.4, 0.0);
create_shaders();
}
/*
* Create an RGB, double-buffered X window.
* Return the window and context handles.
*/
static void
make_x_window(Display *x_dpy, EGLDisplay egl_dpy,
const char *name,
int x, int y, int width, int height,
Window *winRet,
EGLContext *ctxRet,
EGLSurface *surfRet)
{
static const EGLint attribs[] = {
EGL_RED_SIZE, 1,
EGL_GREEN_SIZE, 1,
EGL_BLUE_SIZE, 1,
EGL_DEPTH_SIZE, 1,
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
EGL_NONE
};
#if USE_FULL_GL
static const EGLint ctx_attribs[] = {
EGL_NONE
};
#else
static const EGLint ctx_attribs[] = {
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE
};
#endif
int scrnum;
XSetWindowAttributes attr;
unsigned long mask;
Window root;
Window win;
XVisualInfo *visInfo, visTemplate;
int num_visuals;
EGLContext ctx;
EGLConfig config;
EGLint num_configs;
EGLint vid;
scrnum = DefaultScreen( x_dpy );
root = RootWindow( x_dpy, scrnum );
if (!eglChooseConfig( egl_dpy, attribs, &config, 1, &num_configs)) {
printf("Error: couldn't get an EGL visual config\n");
exit(1);
}
assert(config);
assert(num_configs > 0);
if (!eglGetConfigAttrib(egl_dpy, config, EGL_NATIVE_VISUAL_ID, &vid)) {
printf("Error: eglGetConfigAttrib() failed\n");
exit(1);
}
/* The X window visual must match the EGL config */
visTemplate.visualid = vid;
visInfo = XGetVisualInfo(x_dpy, VisualIDMask, &visTemplate, &num_visuals);
if (!visInfo) {
printf("Error: couldn't get X visual\n");
exit(1);
}
/* window attributes */
attr.background_pixel = 0;
attr.border_pixel = 0;
attr.colormap = XCreateColormap( x_dpy, root, visInfo->visual, AllocNone);
attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
win = XCreateWindow( x_dpy, root, 0, 0, width, height,
0, visInfo->depth, InputOutput,
visInfo->visual, mask, &attr );
/* set hints and properties */
{
XSizeHints sizehints;
sizehints.x = x;
sizehints.y = y;
sizehints.width = width;
sizehints.height = height;
sizehints.flags = USSize | USPosition;
XSetNormalHints(x_dpy, win, &sizehints);
XSetStandardProperties(x_dpy, win, name, name,
None, (char **)NULL, 0, &sizehints);
}
#if USE_FULL_GL /* XXX fix this when eglBindAPI() works */
eglBindAPI(EGL_OPENGL_API);
#else
eglBindAPI(EGL_OPENGL_ES_API);
#endif
ctx = eglCreateContext(egl_dpy, config, EGL_NO_CONTEXT, ctx_attribs );
if (!ctx) {
printf("Error: eglCreateContext failed\n");
exit(1);
}
#if !USE_FULL_GL
/* test eglQueryContext() */
{
EGLint val;
if(!eglQueryContext(egl_dpy, ctx, EGL_CONTEXT_CLIENT_VERSION, &val)) {
printf("Error: eglQueryContext failed\n");
exit(1);
}
}
#endif
*surfRet = eglCreateWindowSurface(egl_dpy, config, win, NULL);
if (!*surfRet) {
printf("Error: eglCreateWindowSurface failed\n");
exit(1);
}
/* sanity checks */
{
EGLint val;
eglQuerySurface(egl_dpy, *surfRet, EGL_WIDTH, &val);
assert(val == width);
eglQuerySurface(egl_dpy, *surfRet, EGL_HEIGHT, &val);
assert(val == height);
assert(eglGetConfigAttrib(egl_dpy, config, EGL_SURFACE_TYPE, &val));
assert(val & EGL_WINDOW_BIT);
}
XFree(visInfo);
*winRet = win;
*ctxRet = ctx;
}
static void
event_loop(Display *dpy, Window win,
EGLDisplay egl_dpy, EGLSurface egl_surf)
{
while (1) {
int redraw = 0;
XEvent event;
XNextEvent(dpy, &event);
switch (event.type) {
case Expose:
redraw = 1;
break;
case ConfigureNotify:
reshape(event.xconfigure.width, event.xconfigure.height);
break;
case KeyPress:
{
char buffer[10];
int r, code;
code = XLookupKeysym(&event.xkey, 0);
if (code == XK_Left) {
view_roty += 5.0;
}
else if (code == XK_Right) {
view_roty -= 5.0;
}
else if (code == XK_Up) {
view_rotx += 5.0;
}
else if (code == XK_Down) {
view_rotx -= 5.0;
}
else {
r = XLookupString(&event.xkey, buffer, sizeof(buffer),
NULL, NULL);
if (buffer[0] == 27) {
/* escape */
return;
}
}
}
redraw = 1;
break;
default:
; /*no-op*/
}
if (redraw) {
draw();
eglSwapBuffers(egl_dpy, egl_surf);
}
}
}
static void
usage(void)
{
printf("Usage:\n");
printf(" -display <displayname> set the display to run on\n");
printf(" -info display OpenGL renderer info\n");
}
int
main(int argc, char *argv[])
{
const int winWidth = 300, winHeight = 300;
Display *x_dpy;
Window win;
EGLSurface egl_surf;
EGLContext egl_ctx;
EGLDisplay egl_dpy;
char *dpyName = NULL;
GLboolean printInfo = GL_FALSE;
EGLint egl_major, egl_minor;
int i;
const char *s;
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-display") == 0) {
dpyName = argv[i+1];
i++;
}
else if (strcmp(argv[i], "-info") == 0) {
printInfo = GL_TRUE;
}
else {
usage();
return -1;
}
}
x_dpy = XOpenDisplay(dpyName);
if (!x_dpy) {
printf("Error: couldn't open display %s\n",
dpyName ? dpyName : getenv("DISPLAY"));
return -1;
}
egl_dpy = eglGetDisplay(x_dpy);
if (!egl_dpy) {
printf("Error: eglGetDisplay() failed\n");
return -1;
}
if (!eglInitialize(egl_dpy, &egl_major, &egl_minor)) {
printf("Error: eglInitialize() failed\n");
return -1;
}
s = eglQueryString(egl_dpy, EGL_VERSION);
printf("EGL_VERSION = %s\n", s);
s = eglQueryString(egl_dpy, EGL_VENDOR);
printf("EGL_VENDOR = %s\n", s);
s = eglQueryString(egl_dpy, EGL_EXTENSIONS);
printf("EGL_EXTENSIONS = %s\n", s);
s = eglQueryString(egl_dpy, EGL_CLIENT_APIS);
printf("EGL_CLIENT_APIS = %s\n", s);
#if USE_FULL_GL
const char window_title[] = "OpenGL EGL tri";
#else
const char window_title[] = "OpenGL ES 2.x tri";
#endif
make_x_window(x_dpy, egl_dpy,
window_title, 0, 0, winWidth, winHeight,
&win, &egl_ctx, &egl_surf);
XMapWindow(x_dpy, win);
if (!eglMakeCurrent(egl_dpy, egl_surf, egl_surf, egl_ctx)) {
printf("Error: eglMakeCurrent() failed\n");
return -1;
}
if (printInfo) {
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
}
init();
/* Set initial projection/viewing transformation.
* We can't be sure we'll get a ConfigureNotify event when the window
* first appears.
*/
reshape(winWidth, winHeight);
event_loop(x_dpy, win, egl_dpy, egl_surf);
eglDestroyContext(egl_dpy, egl_ctx);
eglDestroySurface(egl_dpy, egl_surf);
eglTerminate(egl_dpy);
XDestroyWindow(x_dpy, win);
XCloseDisplay(x_dpy);
return 0;
}