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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <dirent.h>
#include <errno.h>
#include <error.h>
#include <X11/Xlib.h>
#include "common.h"
#include <EGL/egl.h>
struct x11_window {
Window win;
EGLSurface egl_surface;
};
struct window {
struct display *display;
int width, height;
struct x11_window x11;
};
struct x11_display {
Display *dpy;
EGLDisplay egl_display;
EGLConfig egl_conf;
EGLContext egl_ctx;
};
struct display {
struct x11_display x11;
};
struct client {
struct display *d;
struct window *w;
int sock_fd;
};
static void x11_window_create(struct window *w)
{
Window root;
EGLBoolean b;
struct display *d = w->display;
XSetWindowAttributes swa;
root = DefaultRootWindow(d->x11.dpy);
memset(&swa, 0, sizeof(XSetWindowAttributes));
w->x11.win = XCreateWindow(d->x11.dpy, root, 0, 0,
w->width, w->height, 0,
CopyFromParent, InputOutput,
CopyFromParent, CWEventMask,
&swa);
XMapWindow(d->x11.dpy, w->x11.win);
w->x11.egl_surface = eglCreateWindowSurface( d->x11.egl_display,
d->x11.egl_conf,
(EGLNativeWindowType)w->x11.win, NULL);
if (!w->x11.egl_surface)
error(1, errno, "failed to init egl surface");
b = eglMakeCurrent(d->x11.egl_display,
w->x11.egl_surface,
w->x11.egl_surface,
d->x11.egl_ctx);
if (!b)
error(1, errno, "Cannot activate EGL context");
}
static struct window *window_create(struct display *d)
{
struct window *w;
w = calloc(1, sizeof(struct window));
if (!w)
error(1, errno, "can't allocate window");
w->display = d;
w->width = 250;
w->height = 250;
x11_window_create(w);
return w;
}
static void x11_window_destroy(struct window *w)
{
struct display *d = w->display;
eglMakeCurrent(d->x11.egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE,
EGL_NO_CONTEXT);
eglDestroySurface(d->x11.egl_display, w->x11.egl_surface);
XDestroyWindow(d->x11.dpy, w->x11.win);
}
static void window_destroy(struct window *window)
{
x11_window_destroy(window);
free(window);
}
static void x11_display_init(struct display *d)
{
static const EGLint conf_att[] = {
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
EGL_RED_SIZE, 1,
EGL_GREEN_SIZE, 1,
EGL_BLUE_SIZE, 1,
EGL_ALPHA_SIZE, 0,
EGL_NONE,
};
static const EGLint ctx_att[] = {
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE
};
EGLBoolean b;
EGLenum api;
EGLint major, minor, n;
d->x11.dpy = XOpenDisplay(NULL);
if (!d->x11.dpy)
error(1, errno, "Unable to open X server display");
d->x11.egl_display = eglGetDisplay((EGLNativeDisplayType)d->x11.dpy);
if (d->x11.egl_display == EGL_NO_DISPLAY)
error(1, errno, "Failed to get EGL display");
if (!eglInitialize(d->x11.egl_display, &major, &minor))
error(1, errno, "Failed to init EGL display");
fprintf(stderr, "EGL major/minor: %d.%d\n", major, minor);
fprintf(stderr, "EGL version: %s\n",
eglQueryString(d->x11.egl_display, EGL_VERSION));
fprintf(stderr, "EGL vendor: %s\n",
eglQueryString(d->x11.egl_display, EGL_VENDOR));
fprintf(stderr, "EGL extensions: %s\n",
eglQueryString(d->x11.egl_display, EGL_EXTENSIONS));
api = EGL_OPENGL_API;
b = eglBindAPI(api);
if (!b)
error(1, errno, "cannot bind OpenGLES API");
b = eglChooseConfig(d->x11.egl_display, conf_att, &d->x11.egl_conf,
1, &n);
if (!b || n != 1)
error(1, errno, "cannot find suitable EGL config");
d->x11.egl_ctx = eglCreateContext(d->x11.egl_display,
d->x11.egl_conf,
EGL_NO_CONTEXT,
ctx_att);
if (!d->x11.egl_ctx)
error(1, errno, "cannot create EGL context");
eglMakeCurrent(d->x11.egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE,
EGL_NO_CONTEXT);
}
static struct display *display_create(void)
{
struct display *d;
d = calloc(1, sizeof(*d));
if (!d)
error(1, errno, "cannot allocate memory");
x11_display_init(d);
return d;
}
static void display_destroy(struct display *d)
{
XCloseDisplay(d->x11.dpy);
free(d);
}
struct client *client_create(int sock_fd)
{
struct client *client;
client = calloc(1, sizeof(struct client));
if (!client)
error(1, errno, "cannot allocate memory");
client->d = display_create();
client->w = window_create(client->d);
client->sock_fd = sock_fd;
return client;
}
void client_destroy(struct client *client)
{
window_destroy(client->w);
display_destroy(client->d);
close(client->sock_fd);
free(client);
}
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