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backend/headless: add wlr_headless_backend_create_with_renderer

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This allows one to create a headless backend with an existing renderer.
master
Simon Ser 5 years ago committed by Drew DeVault
parent 40513f1a0e
commit 6129a6f93e
4 changed files with 69 additions and 32 deletions
Show Stats Download Patch File Download Diff File

79
backend/headless/backend.c
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@ -62,7 +62,9 @@ static void backend_destroy(struct wlr_backend *wlr_backend) {
wlr_signal_emit_safe(&wlr_backend->events.destroy, backend);
wlr_renderer_destroy(backend->renderer);
wlr_egl_finish(&backend->egl);
if (backend->egl == &backend->priv_egl) {
wlr_egl_finish(&backend->priv_egl);
}
free(backend);
}
@ -85,6 +87,34 @@ static void handle_display_destroy(struct wl_listener *listener, void *data) {
backend_destroy(&backend->backend);
}
static bool backend_init(struct wlr_headless_backend *backend,
struct wl_display *display, struct wlr_renderer *renderer) {
wlr_backend_init(&backend->backend, &backend_impl);
backend->display = display;
wl_list_init(&backend->outputs);
wl_list_init(&backend->input_devices);
backend->renderer = renderer;
backend->egl = wlr_gles2_renderer_get_egl(renderer);
if (wlr_gles2_renderer_check_ext(backend->renderer, "GL_OES_rgb8_rgba8") ||
wlr_gles2_renderer_check_ext(backend->renderer,
"GL_OES_required_internalformat") ||
wlr_gles2_renderer_check_ext(backend->renderer, "GL_ARM_rgba8")) {
backend->internal_format = GL_RGBA8_OES;
} else {
wlr_log(WLR_INFO, "GL_RGBA8_OES not supported, "
"falling back to GL_RGBA4 internal format "
"(performance may be affected)");
backend->internal_format = GL_RGBA4;
}
backend->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &backend->display_destroy);
return true;
}
struct wlr_backend *wlr_headless_backend_create(struct wl_display *display,
wlr_renderer_create_func_t create_renderer_func) {
wlr_log(WLR_INFO, "Creating headless backend");
@ -95,10 +125,6 @@ struct wlr_backend *wlr_headless_backend_create(struct wl_display *display,
wlr_log(WLR_ERROR, "Failed to allocate wlr_headless_backend");
return NULL;
}
wlr_backend_init(&backend->backend, &backend_impl);
backend->display = display;
wl_list_init(&backend->outputs);
wl_list_init(&backend->input_devices);
static const EGLint config_attribs[] = {
EGL_SURFACE_TYPE, 0,
@ -113,38 +139,43 @@ struct wlr_backend *wlr_headless_backend_create(struct wl_display *display,
create_renderer_func = wlr_renderer_autocreate;
}
backend->renderer = create_renderer_func(&backend->egl,
struct wlr_renderer *renderer = create_renderer_func(&backend->priv_egl,
EGL_PLATFORM_SURFACELESS_MESA, EGL_DEFAULT_DISPLAY,
(EGLint*)config_attribs, 0);
if (!backend->renderer) {
if (!renderer) {
wlr_log(WLR_ERROR, "Failed to create renderer");
goto error_backend;
free(backend);
return NULL;
}
if (wlr_gles2_renderer_check_ext(backend->renderer, "GL_OES_rgb8_rgba8") ||
wlr_gles2_renderer_check_ext(backend->renderer,
"GL_OES_required_internalformat") ||
wlr_gles2_renderer_check_ext(backend->renderer, "GL_ARM_rgba8")) {
backend->internal_format = GL_RGBA8_OES;
} else {
wlr_log(WLR_INFO, "GL_RGBA8_OES not supported, "
"falling back to GL_RGBA4 internal format "
"(performance may be affected)");
backend->internal_format = GL_RGBA4;
if (!backend_init(backend, display, renderer)) {
wlr_renderer_destroy(backend->renderer);
free(backend);
return NULL;
}
backend->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &backend->display_destroy);
return &backend->backend;
}
error_renderer:
wlr_renderer_destroy(backend->renderer);
error_backend:
struct wlr_backend *wlr_headless_backend_create_with_renderer(
struct wl_display *display, struct wlr_renderer *renderer) {
wlr_log(WLR_INFO, "Creating headless backend");
struct wlr_headless_backend *backend =
calloc(1, sizeof(struct wlr_headless_backend));
if (!backend) {
wlr_log(WLR_ERROR, "Failed to allocate wlr_headless_backend");
return NULL;
}
if (!backend_init(backend, display, renderer)) {
free(backend);
return NULL;
}
return &backend->backend;
}
bool wlr_backend_is_headless(struct wlr_backend *backend) {
return backend->impl == &backend_impl;
}

10
backend/headless/output.c
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@ -16,7 +16,7 @@ static struct wlr_headless_output *headless_output_from_output(
static bool create_fbo(struct wlr_headless_output *output,
unsigned int width, unsigned int height) {
if (!wlr_egl_make_current(&output->backend->egl, EGL_NO_SURFACE, NULL)) {
if (!wlr_egl_make_current(output->backend->egl, EGL_NO_SURFACE, NULL)) {
return false;
}
@ -46,7 +46,7 @@ static bool create_fbo(struct wlr_headless_output *output,
}
static void destroy_fbo(struct wlr_headless_output *output) {
if (!wlr_egl_make_current(&output->backend->egl, EGL_NO_SURFACE, NULL)) {
if (!wlr_egl_make_current(output->backend->egl, EGL_NO_SURFACE, NULL)) {
return;
}
@ -82,7 +82,7 @@ static bool output_attach_render(struct wlr_output *wlr_output,
struct wlr_headless_output *output =
headless_output_from_output(wlr_output);
if (!wlr_egl_make_current(&output->backend->egl, EGL_NO_SURFACE, NULL)) {
if (!wlr_egl_make_current(output->backend->egl, EGL_NO_SURFACE, NULL)) {
return false;
}
@ -129,7 +129,7 @@ static bool output_commit(struct wlr_output *wlr_output) {
wlr_output_send_present(wlr_output, NULL);
}
wlr_egl_make_current(&output->backend->egl, EGL_NO_SURFACE, NULL);
wlr_egl_make_current(output->backend->egl, EGL_NO_SURFACE, NULL);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
return true;
@ -138,7 +138,7 @@ static bool output_commit(struct wlr_output *wlr_output) {
static void output_rollback(struct wlr_output *wlr_output) {
struct wlr_headless_output *output =
headless_output_from_output(wlr_output);
wlr_egl_make_current(&output->backend->egl, EGL_NO_SURFACE, NULL);
wlr_egl_make_current(output->backend->egl, EGL_NO_SURFACE, NULL);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}

3
include/backend/headless.h
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@ -9,7 +9,8 @@
struct wlr_headless_backend {
struct wlr_backend backend;
struct wlr_egl egl;
struct wlr_egl priv_egl; // may be uninitialized
struct wlr_egl *egl;
struct wlr_renderer *renderer;
struct wl_display *display;
struct wl_list outputs;

5
include/wlr/backend/headless.h
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@ -19,6 +19,11 @@
*/
struct wlr_backend *wlr_headless_backend_create(struct wl_display *display,
wlr_renderer_create_func_t create_renderer_func);
/**
* Creates a headless backend with an existing renderer.
*/
struct wlr_backend *wlr_headless_backend_create_with_renderer(
struct wl_display *display, struct wlr_renderer *renderer);
/**
* Create a new headless output backed by an in-memory EGL framebuffer. You can
* read pixels from this framebuffer via wlr_renderer_read_pixels but it is

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