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#include <stdlib.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <GLES2/gl2.h>
#include <wlr/interfaces/wlr_output.h>
#include <wlr/util/log.h>
#include "backend/headless.h"
static EGLSurface egl_create_surface(struct wlr_egl *egl, unsigned int width,
unsigned int height) {
EGLint attribs[] = {EGL_WIDTH, width, EGL_HEIGHT, height, EGL_NONE};
EGLSurface surf = eglCreatePbufferSurface(egl->display, egl->config, attribs);
if (surf == EGL_NO_SURFACE) {
wlr_log(L_ERROR, "Failed to create EGL surface: %s", egl_error());
return EGL_NO_SURFACE;
}
return surf;
}
static bool output_set_custom_mode(struct wlr_output *wlr_output, int32_t width,
int32_t height, int32_t refresh) {
struct wlr_headless_backend_output *output =
(struct wlr_headless_backend_output *)wlr_output;
struct wlr_headless_backend *backend = output->backend;
if (output->egl_surface) {
eglDestroySurface(backend->egl.display, output->egl_surface);
}
output->egl_surface = egl_create_surface(&backend->egl, width, height);
if (output->egl_surface == EGL_NO_SURFACE) {
wlr_log(L_ERROR, "Failed to recreate EGL surface");
wlr_output_destroy(wlr_output);
return false;
}
output->frame_delay = 1000000 / refresh;
wlr_output_update_custom_mode(&output->wlr_output, width, height, refresh);
return true;
}
static void output_transform(struct wlr_output *wlr_output,
enum wl_output_transform transform) {
struct wlr_headless_backend_output *output =
(struct wlr_headless_backend_output *)wlr_output;
output->wlr_output.transform = transform;
}
static void output_make_current(struct wlr_output *wlr_output) {
struct wlr_headless_backend_output *output =
(struct wlr_headless_backend_output *)wlr_output;
if (!eglMakeCurrent(output->backend->egl.display,
output->egl_surface, output->egl_surface,
output->backend->egl.context)) {
wlr_log(L_ERROR, "eglMakeCurrent failed: %s", egl_error());
}
}
static void output_swap_buffers(struct wlr_output *wlr_output) {
// No-op
}
static void output_destroy(struct wlr_output *wlr_output) {
struct wlr_headless_backend_output *output =
(struct wlr_headless_backend_output *)wlr_output;
wl_signal_emit(&output->backend->backend.events.output_remove,
&output->wlr_output);
wl_list_remove(&output->link);
eglDestroySurface(output->backend->egl.display, output->egl_surface);
free(output);
}
static const struct wlr_output_impl output_impl = {
.set_custom_mode = output_set_custom_mode,
.transform = output_transform,
.destroy = output_destroy,
.make_current = output_make_current,
.swap_buffers = output_swap_buffers,
};
static int signal_frame(void *data) {
struct wlr_headless_backend_output *output = data;
wl_signal_emit(&output->wlr_output.events.frame, &output->wlr_output);
wl_event_source_timer_update(output->frame_timer, output->frame_delay);
return 0;
}
struct wlr_output *wlr_headless_add_output(struct wlr_backend *wlr_backend,
unsigned int width, unsigned int height) {
struct wlr_headless_backend *backend =
(struct wlr_headless_backend *)wlr_backend;
struct wlr_headless_backend_output *output =
calloc(1, sizeof(struct wlr_headless_backend_output));
if (output == NULL) {
wlr_log(L_ERROR, "Failed to allocate wlr_headless_backend_output");
return NULL;
}
output->backend = backend;
wlr_output_init(&output->wlr_output, &backend->backend, &output_impl);
struct wlr_output *wlr_output = &output->wlr_output;
output->egl_surface = egl_create_surface(&backend->egl, width, height);
if (output->egl_surface == EGL_NO_SURFACE) {
wlr_log(L_ERROR, "Failed to create EGL surface");
goto error;
}
output_set_custom_mode(wlr_output, width, height, 60*1000);
strncpy(wlr_output->make, "headless", sizeof(wlr_output->make));
strncpy(wlr_output->model, "headless", sizeof(wlr_output->model));
snprintf(wlr_output->name, sizeof(wlr_output->name), "HEADLESS-%d",
wl_list_length(&backend->outputs) + 1);
if (!eglMakeCurrent(output->backend->egl.display,
output->egl_surface, output->egl_surface,
output->backend->egl.context)) {
wlr_log(L_ERROR, "eglMakeCurrent failed: %s", egl_error());
goto error;
}
glViewport(0, 0, wlr_output->width, wlr_output->height);
glClearColor(1.0, 1.0, 1.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
struct wl_event_loop *ev = wl_display_get_event_loop(backend->display);
output->frame_timer = wl_event_loop_add_timer(ev, signal_frame, output);
wl_list_insert(&backend->outputs, &output->link);
if (backend->started) {
wl_event_source_timer_update(output->frame_timer, output->frame_delay);
wlr_output_create_global(wlr_output, backend->display);
wl_signal_emit(&backend->backend.events.output_add, wlr_output);
}
return wlr_output;
error:
wlr_output_destroy(&output->wlr_output);
return NULL;
}
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