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#include <err.h>
#include <stdlib.h>
#include <cairo.h>
#include <cairo-gl.h>
#include <EGL/egl.h>
#include <GLES3/gl3.h>
#include "egl.h"
static Display* getDisplay()
{
static Display* display = NULL;
if (!display)
display = XOpenDisplay(NULL);
return display;
}
static bool
createWindow(egl_state_t *state, int width, int height)
{
state->dpy = XOpenDisplay (NULL);
if (state->dpy == NULL) {
warnx ("Failed to open display: %s\n", XDisplayName (0));
return false;
}
state->window = XCreateSimpleWindow (state->dpy, DefaultRootWindow (state->dpy),
0, 0,
width, height,
0,
BlackPixel (state->dpy, DefaultRootWindow (state->dpy)),
BlackPixel (state->dpy, DefaultRootWindow (state->dpy)));
XMapWindow (state->dpy, state->window);
return true;
}
static void
cleanup (void *data)
{
egl_state_t *state = (egl_state_t*)data;
eglDestroyContext (state->egl_display, state->egl_context);
eglDestroySurface (state->egl_display, state->egl_surface);
eglTerminate (state->egl_display);
XCloseDisplay (state->dpy);
free (state);
}
cairo_surface_t *
create_cairo_surface_egl (int width, int height)
{
egl_state_t *state;
cairo_device_t *cairo_device;
cairo_surface_t *cairo_surface;
state = (egl_state_t*) malloc (sizeof (egl_state_t));
if (!state) {
warnx ("Out of memory\n");
return NULL;
}
if (!createWindow(state, width, height)) {
return NULL;
}
if (!initializeEGL(state)) {
cleanup(state);
return NULL;
}
if (!createEGLContextWithWindow(state)) {
cleanup(state);
return NULL;
}
cairo_device = cairo_egl_device_create (state->egl_display, state->egl_context);
cairo_gl_device_set_thread_aware (cairo_device, 0);
cairo_surface = cairo_gl_surface_create_for_egl (cairo_device,
state->egl_surface,
width, height);
if (cairo_device_set_user_data (cairo_device,
(cairo_user_data_key_t *) cleanup,
state,
cleanup))
{
warnx ("Failed to setup cleanup callback closure\n");
cleanup (state);
return NULL;
}
cairo_device_destroy (cairo_device);
return cairo_surface;
}
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