Merge pull request #1473 from RyanDwyer/noop-backend

Introduce noop backend
This commit is contained in:
Drew DeVault 2019-01-17 08:02:27 -05:00 committed by GitHub
commit 0e0ba65bc0
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7 changed files with 218 additions and 1 deletions

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@ -11,6 +11,7 @@
#include <wlr/backend/interface.h>
#include <wlr/backend/libinput.h>
#include <wlr/backend/multi.h>
#include <wlr/backend/noop.h>
#include <wlr/backend/session.h>
#include <wlr/backend/wayland.h>
#include <wlr/config.h>
@ -133,6 +134,20 @@ static struct wlr_backend *attempt_headless_backend(
return backend;
}
static struct wlr_backend *attempt_noop_backend(struct wl_display *display) {
struct wlr_backend *backend = wlr_noop_backend_create(display);
if (backend == NULL) {
return NULL;
}
size_t outputs = parse_outputs_env("WLR_NOOP_OUTPUTS");
for (size_t i = 0; i < outputs; ++i) {
wlr_noop_add_output(backend);
}
return backend;
}
static struct wlr_backend *attempt_drm_backend(struct wl_display *display,
struct wlr_backend *backend, struct wlr_session *session,
wlr_renderer_create_func_t create_renderer_func) {
@ -170,6 +185,8 @@ static struct wlr_backend *attempt_backend_by_name(struct wl_display *display,
#endif
} else if (strcmp(name, "headless") == 0) {
return attempt_headless_backend(display, create_renderer_func);
} else if (strcmp(name, "noop") == 0) {
return attempt_noop_backend(display);
} else if (strcmp(name, "drm") == 0 || strcmp(name, "libinput") == 0) {
// DRM and libinput need a session
if (!*session) {

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@ -20,6 +20,8 @@ backend_files = files(
'libinput/tablet_tool.c',
'libinput/touch.c',
'multi/backend.c',
'noop/backend.c',
'noop/output.c',
'session/direct-ipc.c',
'session/session.c',
'wayland/backend.c',

68
backend/noop/backend.c Normal file
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@ -0,0 +1,68 @@
#include <assert.h>
#include <stdlib.h>
#include <wlr/interfaces/wlr_output.h>
#include <wlr/util/log.h>
#include "backend/noop.h"
#include "util/signal.h"
struct wlr_noop_backend *noop_backend_from_backend(
struct wlr_backend *wlr_backend) {
assert(wlr_backend_is_noop(wlr_backend));
return (struct wlr_noop_backend *)wlr_backend;
}
static bool backend_start(struct wlr_backend *wlr_backend) {
struct wlr_noop_backend *backend = noop_backend_from_backend(wlr_backend);
wlr_log(WLR_INFO, "Starting noop backend");
struct wlr_noop_output *output;
wl_list_for_each(output, &backend->outputs, link) {
wlr_output_update_enabled(&output->wlr_output, true);
wlr_signal_emit_safe(&backend->backend.events.new_output,
&output->wlr_output);
}
backend->started = true;
return true;
}
static void backend_destroy(struct wlr_backend *wlr_backend) {
struct wlr_noop_backend *backend = noop_backend_from_backend(wlr_backend);
if (!wlr_backend) {
return;
}
struct wlr_noop_output *output, *output_tmp;
wl_list_for_each_safe(output, output_tmp, &backend->outputs, link) {
wlr_output_destroy(&output->wlr_output);
}
wlr_signal_emit_safe(&wlr_backend->events.destroy, backend);
free(backend);
}
static const struct wlr_backend_impl backend_impl = {
.start = backend_start,
.destroy = backend_destroy,
};
struct wlr_backend *wlr_noop_backend_create(struct wl_display *display) {
wlr_log(WLR_INFO, "Creating noop backend");
struct wlr_noop_backend *backend =
calloc(1, sizeof(struct wlr_noop_backend));
if (!backend) {
wlr_log(WLR_ERROR, "Failed to allocate wlr_noop_backend");
return NULL;
}
wlr_backend_init(&backend->backend, &backend_impl);
backend->display = display;
wl_list_init(&backend->outputs);
return &backend->backend;
}
bool wlr_backend_is_noop(struct wlr_backend *backend) {
return backend->impl == &backend_impl;
}

75
backend/noop/output.c Normal file
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@ -0,0 +1,75 @@
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <wlr/interfaces/wlr_output.h>
#include <wlr/util/log.h>
#include "backend/noop.h"
#include "util/signal.h"
static struct wlr_noop_output *noop_output_from_output(
struct wlr_output *wlr_output) {
assert(wlr_output_is_noop(wlr_output));
return (struct wlr_noop_output *)wlr_output;
}
static void output_transform(struct wlr_output *wlr_output,
enum wl_output_transform transform) {
// empty
}
static bool output_make_current(struct wlr_output *wlr_output, int *buffer_age) {
return true;
}
static bool output_swap_buffers(struct wlr_output *wlr_output,
pixman_region32_t *damage) {
return true;
}
static void output_destroy(struct wlr_output *wlr_output) {
struct wlr_noop_output *output =
noop_output_from_output(wlr_output);
wl_list_remove(&output->link);
free(output);
}
static const struct wlr_output_impl output_impl = {
.transform = output_transform,
.destroy = output_destroy,
.make_current = output_make_current,
.swap_buffers = output_swap_buffers,
};
bool wlr_output_is_noop(struct wlr_output *wlr_output) {
return wlr_output->impl == &output_impl;
}
struct wlr_output *wlr_noop_add_output(struct wlr_backend *wlr_backend) {
struct wlr_noop_backend *backend = noop_backend_from_backend(wlr_backend);
struct wlr_noop_output *output = calloc(1, sizeof(struct wlr_noop_output));
if (output == NULL) {
wlr_log(WLR_ERROR, "Failed to allocate wlr_noop_output");
return NULL;
}
output->backend = backend;
wlr_output_init(&output->wlr_output, &backend->backend, &output_impl,
backend->display);
struct wlr_output *wlr_output = &output->wlr_output;
strncpy(wlr_output->make, "noop", sizeof(wlr_output->make));
strncpy(wlr_output->model, "noop", sizeof(wlr_output->model));
snprintf(wlr_output->name, sizeof(wlr_output->name), "NOOP-%d",
wl_list_length(&backend->outputs) + 1);
wl_list_insert(&backend->outputs, &output->link);
if (backend->started) {
wlr_output_update_enabled(wlr_output, true);
wlr_signal_emit_safe(&backend->backend.events.new_output, wlr_output);
}
return wlr_output;
}

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@ -11,7 +11,7 @@ wlroots specific
control instead of the atomic interface
* *WLR_LIBINPUT_NO_DEVICES*: set to 1 to not fail without any input devices
* *WLR_BACKENDS*: comma-separated list of backends to use (available backends:
wayland, x11, headless)
wayland, x11, headless, noop)
* *WLR_WL_OUTPUTS*: when using the wayland backend specifies the number of outputs
* *WLR_X11_OUTPUTS*: when using the X11 backend specifies the number of outputs
* *WLR_HEADLESS_OUTPUTS*: when using the headless backend specifies the number

24
include/backend/noop.h Normal file
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@ -0,0 +1,24 @@
#ifndef BACKEND_NOOP_H
#define BACKEND_NOOP_H
#include <wlr/backend/noop.h>
#include <wlr/backend/interface.h>
struct wlr_noop_backend {
struct wlr_backend backend;
struct wl_display *display;
struct wl_list outputs;
bool started;
};
struct wlr_noop_output {
struct wlr_output wlr_output;
struct wlr_noop_backend *backend;
struct wl_list link;
};
struct wlr_noop_backend *noop_backend_from_backend(
struct wlr_backend *wlr_backend);
#endif

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@ -0,0 +1,31 @@
/*
* This an unstable interface of wlroots. No guarantees are made regarding the
* future consistency of this API.
*/
#ifndef WLR_USE_UNSTABLE
#error "Add -DWLR_USE_UNSTABLE to enable unstable wlroots features"
#endif
#ifndef WLR_BACKEND_NOOP_H
#define WLR_BACKEND_NOOP_H
#include <wlr/backend.h>
#include <wlr/types/wlr_output.h>
/**
* Creates a noop backend. Noop backends do not have a framebuffer and are not
* capable of rendering anything. They are useful for when there's no real
* outputs connected; you can stash your views on a noop output until an output
* is connected.
*/
struct wlr_backend *wlr_noop_backend_create(struct wl_display *display);
/**
* Create a new noop output.
*/
struct wlr_output *wlr_noop_add_output(struct wlr_backend *backend);
bool wlr_backend_is_noop(struct wlr_backend *backend);
bool wlr_output_is_noop(struct wlr_output *output);
#endif