wlroots/backend/x11/output.c

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#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <stdlib.h>
#include <string.h>
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#include <drm_fourcc.h>
#include <xcb/dri3.h>
#include <xcb/present.h>
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#include <xcb/xcb.h>
#include <xcb/xinput.h>
#include <wlr/interfaces/wlr_output.h>
#include <wlr/interfaces/wlr_pointer.h>
#include <wlr/interfaces/wlr_touch.h>
#include <wlr/util/log.h>
#include "backend/x11.h"
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#include "render/swapchain.h"
#include "render/wlr_renderer.h"
#include "util/signal.h"
#include "util/time.h"
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static void parse_xcb_setup(struct wlr_output *output,
xcb_connection_t *xcb) {
const xcb_setup_t *xcb_setup = xcb_get_setup(xcb);
snprintf(output->make, sizeof(output->make), "%.*s",
xcb_setup_vendor_length(xcb_setup),
xcb_setup_vendor(xcb_setup));
snprintf(output->model, sizeof(output->model), "%"PRIu16".%"PRIu16,
xcb_setup->protocol_major_version,
xcb_setup->protocol_minor_version);
}
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static struct wlr_x11_output *get_x11_output_from_output(
struct wlr_output *wlr_output) {
assert(wlr_output_is_x11(wlr_output));
return (struct wlr_x11_output *)wlr_output;
}
static void output_set_refresh(struct wlr_output *wlr_output, int32_t refresh) {
struct wlr_x11_output *output = get_x11_output_from_output(wlr_output);
wlr_output_update_custom_mode(&output->wlr_output, wlr_output->width,
wlr_output->height, 0);
}
static bool output_set_custom_mode(struct wlr_output *wlr_output,
int32_t width, int32_t height, int32_t refresh) {
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struct wlr_x11_output *output = get_x11_output_from_output(wlr_output);
struct wlr_x11_backend *x11 = output->x11;
output_set_refresh(&output->wlr_output, refresh);
const uint32_t values[] = { width, height };
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xcb_void_cookie_t cookie = xcb_configure_window_checked(
x11->xcb, output->win,
XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT, values);
xcb_generic_error_t *error;
if ((error = xcb_request_check(x11->xcb, cookie))) {
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wlr_log(WLR_ERROR, "Could not set window size to %dx%d\n",
width, height);
free(error);
return false;
}
return true;
}
static void destroy_x11_buffer(struct wlr_x11_buffer *buffer);
static void output_destroy(struct wlr_output *wlr_output) {
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struct wlr_x11_output *output = get_x11_output_from_output(wlr_output);
struct wlr_x11_backend *x11 = output->x11;
wlr_input_device_destroy(&output->pointer_dev);
wlr_input_device_destroy(&output->touch_dev);
struct wlr_x11_buffer *buffer, *buffer_tmp;
wl_list_for_each_safe(buffer, buffer_tmp, &output->buffers, link) {
destroy_x11_buffer(buffer);
}
wl_list_remove(&output->link);
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wlr_buffer_unlock(output->back_buffer);
wlr_swapchain_destroy(output->swapchain);
// A zero event mask deletes the event context
xcb_present_select_input(x11->xcb, output->present_event_id, output->win, 0);
xcb_destroy_window(x11->xcb, output->win);
xcb_flush(x11->xcb);
free(output);
}
static bool output_attach_render(struct wlr_output *wlr_output,
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int *buffer_age) {
struct wlr_x11_output *output = get_x11_output_from_output(wlr_output);
struct wlr_x11_backend *x11 = output->x11;
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wlr_buffer_unlock(output->back_buffer);
output->back_buffer = wlr_swapchain_acquire(output->swapchain, buffer_age);
if (!output->back_buffer) {
return false;
}
if (!wlr_renderer_bind_buffer(x11->renderer, output->back_buffer)) {
return false;
}
return true;
}
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static bool output_test(struct wlr_output *wlr_output) {
if (wlr_output->pending.committed & WLR_OUTPUT_STATE_ENABLED) {
wlr_log(WLR_DEBUG, "Cannot disable an X11 output");
return false;
}
if (wlr_output->pending.committed & WLR_OUTPUT_STATE_MODE) {
assert(wlr_output->pending.mode_type == WLR_OUTPUT_STATE_MODE_CUSTOM);
}
return true;
}
static void destroy_x11_buffer(struct wlr_x11_buffer *buffer) {
if (!buffer) {
return;
}
wl_list_remove(&buffer->buffer_destroy.link);
wl_list_remove(&buffer->link);
xcb_free_pixmap(buffer->x11->xcb, buffer->pixmap);
free(buffer);
}
static void buffer_handle_buffer_destroy(struct wl_listener *listener,
void *data) {
struct wlr_x11_buffer *buffer =
wl_container_of(listener, buffer, buffer_destroy);
destroy_x11_buffer(buffer);
}
static struct wlr_x11_buffer *create_x11_buffer(struct wlr_x11_output *output,
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struct wlr_buffer *wlr_buffer) {
struct wlr_x11_backend *x11 = output->x11;
struct wlr_dmabuf_attributes attrs = {0};
if (!wlr_buffer_get_dmabuf(wlr_buffer, &attrs)) {
return NULL;
}
if (attrs.format != x11->x11_format->drm) {
// The pixmap's depth must match the window's depth, otherwise Present
// will throw a Match error
return NULL;
}
// xcb closes the FDs after sending them, so we need to dup them here
struct wlr_dmabuf_attributes dup_attrs = {0};
if (!wlr_dmabuf_attributes_copy(&dup_attrs, &attrs)) {
return NULL;
}
const struct wlr_x11_format *x11_fmt = x11->x11_format;
xcb_pixmap_t pixmap = xcb_generate_id(x11->xcb);
if (x11->dri3_major_version > 1 || x11->dri3_minor_version >= 2) {
if (attrs.n_planes > 4) {
wlr_dmabuf_attributes_finish(&dup_attrs);
return NULL;
}
xcb_dri3_pixmap_from_buffers(x11->xcb, pixmap, output->win,
attrs.n_planes, attrs.width, attrs.height, attrs.stride[0],
attrs.offset[0], attrs.stride[1], attrs.offset[1], attrs.stride[2],
attrs.offset[2], attrs.stride[3], attrs.offset[3], x11_fmt->depth,
x11_fmt->bpp, attrs.modifier, dup_attrs.fd);
} else {
// PixmapFromBuffers requires DRI3 1.2
if (attrs.n_planes != 1 || attrs.modifier != DRM_FORMAT_MOD_INVALID) {
wlr_dmabuf_attributes_finish(&dup_attrs);
return NULL;
}
xcb_dri3_pixmap_from_buffer(x11->xcb, pixmap, output->win,
attrs.height * attrs.stride[0], attrs.width, attrs.height,
attrs.stride[0], x11_fmt->depth, x11_fmt->bpp, dup_attrs.fd[0]);
}
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struct wlr_x11_buffer *buffer = calloc(1, sizeof(struct wlr_x11_buffer));
if (!buffer) {
xcb_free_pixmap(x11->xcb, pixmap);
return NULL;
}
buffer->buffer = wlr_buffer_lock(wlr_buffer);
buffer->pixmap = pixmap;
buffer->x11 = x11;
wl_list_insert(&output->buffers, &buffer->link);
buffer->buffer_destroy.notify = buffer_handle_buffer_destroy;
wl_signal_add(&wlr_buffer->events.destroy, &buffer->buffer_destroy);
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return buffer;
}
static struct wlr_x11_buffer *get_or_create_x11_buffer(
struct wlr_x11_output *output, struct wlr_buffer *wlr_buffer) {
struct wlr_x11_buffer *buffer;
wl_list_for_each(buffer, &output->buffers, link) {
if (buffer->buffer == wlr_buffer) {
wlr_buffer_lock(buffer->buffer);
return buffer;
}
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}
return create_x11_buffer(output, wlr_buffer);
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}
static bool output_commit_buffer(struct wlr_x11_output *output) {
struct wlr_x11_backend *x11 = output->x11;
struct wlr_buffer *buffer = NULL;
switch (output->wlr_output.pending.buffer_type) {
case WLR_OUTPUT_STATE_BUFFER_RENDER:
assert(output->back_buffer != NULL);
wlr_renderer_bind_buffer(x11->renderer, NULL);
buffer = output->back_buffer;
output->back_buffer = NULL;
break;
case WLR_OUTPUT_STATE_BUFFER_SCANOUT:
buffer = wlr_buffer_lock(output->wlr_output.pending.buffer);
break;
}
assert(buffer != NULL);
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struct wlr_x11_buffer *x11_buffer =
get_or_create_x11_buffer(output, buffer);
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if (!x11_buffer) {
goto error;
}
xcb_xfixes_region_t region = XCB_NONE;
if (output->wlr_output.pending.committed & WLR_OUTPUT_STATE_DAMAGE) {
pixman_region32_t *damage = &output->wlr_output.pending.damage;
int rects_len = 0;
pixman_box32_t *rects = pixman_region32_rectangles(damage, &rects_len);
xcb_rectangle_t *xcb_rects = calloc(rects_len, sizeof(xcb_rectangle_t));
if (!xcb_rects) {
goto error;
}
for (int i = 0; i < rects_len; i++) {
pixman_box32_t *box = &rects[i];
xcb_rects[i] = (struct xcb_rectangle_t){
.x = box->x1,
.y = box->y1,
.width = box->x2 - box->x1,
.height = box->y2 - box->y1,
};
}
region = xcb_generate_id(x11->xcb);
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xcb_xfixes_create_region(x11->xcb, region, rects_len, xcb_rects);
free(xcb_rects);
}
uint32_t serial = output->wlr_output.commit_seq;
uint32_t options = 0;
uint64_t target_msc = output->last_msc ? output->last_msc + 1 : 0;
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xcb_present_pixmap(x11->xcb, output->win, x11_buffer->pixmap, serial,
0, region, 0, 0, XCB_NONE, XCB_NONE, XCB_NONE, options, target_msc,
0, 0, 0, NULL);
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if (region != XCB_NONE) {
xcb_xfixes_destroy_region(x11->xcb, region);
}
wlr_buffer_unlock(buffer);
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wlr_swapchain_set_buffer_submitted(output->swapchain, x11_buffer->buffer);
return true;
error:
destroy_x11_buffer(x11_buffer);
wlr_buffer_unlock(buffer);
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return false;
}
static bool output_commit(struct wlr_output *wlr_output) {
struct wlr_x11_output *output = get_x11_output_from_output(wlr_output);
struct wlr_x11_backend *x11 = output->x11;
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if (!output_test(wlr_output)) {
return false;
}
if (wlr_output->pending.committed & WLR_OUTPUT_STATE_MODE) {
if (!output_set_custom_mode(wlr_output,
wlr_output->pending.custom_mode.width,
wlr_output->pending.custom_mode.height,
wlr_output->pending.custom_mode.refresh)) {
return false;
}
}
if (wlr_output->pending.committed & WLR_OUTPUT_STATE_ADAPTIVE_SYNC_ENABLED &&
x11->atoms.variable_refresh != XCB_ATOM_NONE) {
if (wlr_output->pending.adaptive_sync_enabled) {
uint32_t enabled = 1;
xcb_change_property(x11->xcb, XCB_PROP_MODE_REPLACE, output->win,
x11->atoms.variable_refresh, XCB_ATOM_CARDINAL, 32, 1,
&enabled);
wlr_output->adaptive_sync_status = WLR_OUTPUT_ADAPTIVE_SYNC_UNKNOWN;
} else {
xcb_delete_property(x11->xcb, output->win,
x11->atoms.variable_refresh);
wlr_output->adaptive_sync_status = WLR_OUTPUT_ADAPTIVE_SYNC_DISABLED;
}
}
if (wlr_output->pending.committed & WLR_OUTPUT_STATE_BUFFER) {
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if (!output_commit_buffer(output)) {
return false;
}
}
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xcb_flush(x11->xcb);
return true;
}
static void output_rollback_render(struct wlr_output *wlr_output) {
struct wlr_x11_output *output = get_x11_output_from_output(wlr_output);
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struct wlr_x11_backend *x11 = output->x11;
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wlr_renderer_bind_buffer(x11->renderer, NULL);
}
static const struct wlr_output_impl output_impl = {
.destroy = output_destroy,
.attach_render = output_attach_render,
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.test = output_test,
.commit = output_commit,
.rollback_render = output_rollback_render,
};
struct wlr_output *wlr_x11_output_create(struct wlr_backend *backend) {
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struct wlr_x11_backend *x11 = get_x11_backend_from_backend(backend);
if (!x11->started) {
++x11->requested_outputs;
return NULL;
}
struct wlr_x11_output *output = calloc(1, sizeof(struct wlr_x11_output));
if (output == NULL) {
return NULL;
}
output->x11 = x11;
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wl_list_init(&output->buffers);
struct wlr_output *wlr_output = &output->wlr_output;
wlr_output_init(wlr_output, &x11->backend, &output_impl, x11->wl_display);
wlr_output_update_custom_mode(wlr_output, 1024, 768, 0);
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output->swapchain = wlr_swapchain_create(x11->allocator,
wlr_output->width, wlr_output->height, x11->drm_format);
if (!output->swapchain) {
wlr_log(WLR_ERROR, "Failed to create swapchain");
free(output);
return NULL;
}
output_set_refresh(&output->wlr_output, 0);
snprintf(wlr_output->name, sizeof(wlr_output->name), "X11-%zd",
++x11->last_output_num);
parse_xcb_setup(wlr_output, x11->xcb);
char description[128];
snprintf(description, sizeof(description),
"X11 output %zd", x11->last_output_num);
wlr_output_set_description(wlr_output, description);
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// The X11 protocol requires us to set a colormap and border pixel if the
// depth doesn't match the root window's
uint32_t mask = XCB_CW_BORDER_PIXEL | XCB_CW_EVENT_MASK |
XCB_CW_COLORMAP | XCB_CW_CURSOR;
uint32_t values[] = {
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0,
XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_STRUCTURE_NOTIFY,
x11->colormap,
x11->cursor,
};
output->win = xcb_generate_id(x11->xcb);
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xcb_create_window(x11->xcb, x11->depth->depth, output->win,
x11->screen->root, 0, 0, wlr_output->width, wlr_output->height, 0,
XCB_WINDOW_CLASS_INPUT_OUTPUT, x11->visualid, mask, values);
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struct {
xcb_input_event_mask_t head;
xcb_input_xi_event_mask_t mask;
} xinput_mask = {
.head = { .deviceid = XCB_INPUT_DEVICE_ALL_MASTER, .mask_len = 1 },
.mask = XCB_INPUT_XI_EVENT_MASK_KEY_PRESS |
XCB_INPUT_XI_EVENT_MASK_KEY_RELEASE |
XCB_INPUT_XI_EVENT_MASK_BUTTON_PRESS |
XCB_INPUT_XI_EVENT_MASK_BUTTON_RELEASE |
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XCB_INPUT_XI_EVENT_MASK_MOTION |
XCB_INPUT_XI_EVENT_MASK_TOUCH_BEGIN |
XCB_INPUT_XI_EVENT_MASK_TOUCH_END |
XCB_INPUT_XI_EVENT_MASK_TOUCH_UPDATE,
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};
xcb_input_xi_select_events(x11->xcb, output->win, 1, &xinput_mask.head);
uint32_t present_mask = XCB_PRESENT_EVENT_MASK_IDLE_NOTIFY |
XCB_PRESENT_EVENT_MASK_COMPLETE_NOTIFY;
output->present_event_id = xcb_generate_id(x11->xcb);
xcb_present_select_input(x11->xcb, output->present_event_id, output->win,
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present_mask);
xcb_change_property(x11->xcb, XCB_PROP_MODE_REPLACE, output->win,
x11->atoms.wm_protocols, XCB_ATOM_ATOM, 32, 1,
&x11->atoms.wm_delete_window);
wlr_x11_output_set_title(wlr_output, NULL);
xcb_map_window(x11->xcb, output->win);
xcb_flush(x11->xcb);
wl_list_insert(&x11->outputs, &output->link);
wlr_output_update_enabled(wlr_output, true);
wlr_input_device_init(&output->pointer_dev, WLR_INPUT_DEVICE_POINTER,
&input_device_impl, "X11 pointer", 0, 0);
wlr_pointer_init(&output->pointer, &pointer_impl);
output->pointer_dev.pointer = &output->pointer;
output->pointer_dev.output_name = strdup(wlr_output->name);
wlr_input_device_init(&output->touch_dev, WLR_INPUT_DEVICE_TOUCH,
&input_device_impl, "X11 touch", 0, 0);
wlr_touch_init(&output->touch, &touch_impl);
output->touch_dev.touch = &output->touch;
output->touch_dev.output_name = strdup(wlr_output->name);
wl_list_init(&output->touchpoints);
wlr_signal_emit_safe(&x11->backend.events.new_output, wlr_output);
wlr_signal_emit_safe(&x11->backend.events.new_input, &output->pointer_dev);
wlr_signal_emit_safe(&x11->backend.events.new_input, &output->touch_dev);
// Start the rendering loop by requesting the compositor to render a frame
wlr_output_schedule_frame(wlr_output);
return wlr_output;
}
void handle_x11_configure_notify(struct wlr_x11_output *output,
xcb_configure_notify_event_t *ev) {
// ignore events that set an invalid size:
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if (ev->width == 0 || ev->height == 0) {
wlr_log(WLR_DEBUG,
"Ignoring X11 configure event for height=%d, width=%d",
ev->width, ev->height);
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return;
}
if (output->swapchain->width != ev->width ||
output->swapchain->height != ev->height) {
struct wlr_swapchain *swapchain = wlr_swapchain_create(
output->x11->allocator, ev->width, ev->height,
output->x11->drm_format);
if (!swapchain) {
return;
}
wlr_swapchain_destroy(output->swapchain);
output->swapchain = swapchain;
}
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wlr_output_update_custom_mode(&output->wlr_output, ev->width,
ev->height, 0);
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// Move the pointer to its new location
update_x11_pointer_position(output, output->x11->time);
}
bool wlr_output_is_x11(struct wlr_output *wlr_output) {
return wlr_output->impl == &output_impl;
}
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void wlr_x11_output_set_title(struct wlr_output *output, const char *title) {
struct wlr_x11_output *x11_output = get_x11_output_from_output(output);
char wl_title[32];
if (title == NULL) {
if (snprintf(wl_title, sizeof(wl_title), "wlroots - %s", output->name) <= 0) {
return;
}
title = wl_title;
}
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xcb_change_property(x11_output->x11->xcb, XCB_PROP_MODE_REPLACE, x11_output->win,
x11_output->x11->atoms.net_wm_name, x11_output->x11->atoms.utf8_string, 8,
strlen(title), title);
}
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static struct wlr_x11_buffer *get_x11_buffer(struct wlr_x11_output *output,
xcb_pixmap_t pixmap) {
struct wlr_x11_buffer *buffer;
wl_list_for_each(buffer, &output->buffers, link) {
if (buffer->pixmap == pixmap) {
return buffer;
}
}
return NULL;
}
void handle_x11_present_event(struct wlr_x11_backend *x11,
xcb_ge_generic_event_t *event) {
struct wlr_x11_output *output;
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switch (event->event_type) {
case XCB_PRESENT_EVENT_IDLE_NOTIFY:;
xcb_present_idle_notify_event_t *idle_notify =
(xcb_present_idle_notify_event_t *)event;
output = get_x11_output_from_window_id(x11, idle_notify->window);
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if (!output) {
wlr_log(WLR_DEBUG, "Got PresentIdleNotify event for unknown window");
return;
}
struct wlr_x11_buffer *buffer =
get_x11_buffer(output, idle_notify->pixmap);
if (!buffer) {
wlr_log(WLR_DEBUG, "Got PresentIdleNotify event for unknown buffer");
return;
}
wlr_buffer_unlock(buffer->buffer); // may destroy buffer
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break;
case XCB_PRESENT_COMPLETE_NOTIFY:;
xcb_present_complete_notify_event_t *complete_notify =
(xcb_present_complete_notify_event_t *)event;
output = get_x11_output_from_window_id(x11, complete_notify->window);
if (!output) {
wlr_log(WLR_DEBUG, "Got PresentCompleteNotify event for unknown window");
return;
}
output->last_msc = complete_notify->msc;
struct timespec t;
timespec_from_nsec(&t, complete_notify->ust * 1000);
uint32_t flags = 0;
if (complete_notify->mode == XCB_PRESENT_COMPLETE_MODE_FLIP) {
flags |= WLR_OUTPUT_PRESENT_ZERO_COPY;
}
struct wlr_output_event_present present_event = {
.output = &output->wlr_output,
.commit_seq = complete_notify->serial,
.when = &t,
.seq = complete_notify->msc,
.flags = flags,
};
wlr_output_send_present(&output->wlr_output, &present_event);
wlr_output_send_frame(&output->wlr_output);
break;
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default:
wlr_log(WLR_DEBUG, "Unhandled Present event %"PRIu16, event->event_type);
}
}