Initialize headless backend

1 files changed, 83 insertions, 0 deletions

diff --git a/backend/headless/output.c b/backend/headless/output.c
new file mode 100644
index 00000000..194f542f
--- /dev/null
+++ b/backend/headless/output.c
@@ -0,0 +1,83 @@
+#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 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 = wlr_wl_output_set_custom_mode,
+	//.transform = wlr_wl_output_transform,
+	.destroy = output_destroy,
+	//.make_current = wlr_wl_output_make_current,
+	//.swap_buffers = wlr_wl_output_swap_buffers,
+};
+
+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;
+}
+
+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;
+	}
+	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);
+
+	wlr_output_update_size(wlr_output, width, height);
+
+	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);
+
+	if (!eglSwapBuffers(output->backend->egl.display, output->egl_surface)) {
+		wlr_log(L_ERROR, "eglSwapBuffers failed: %s", egl_error());
+		goto error;
+	}
+
+	wl_list_insert(&backend->outputs, &output->link);
+	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;
+}