wlroots/examples/output-layout.c

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#define _POSIX_C_SOURCE 200112L
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#define _XOPEN_SOURCE 700
#include <GLES2/gl2.h>
#include <limits.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <time.h>
#include <unistd.h>
#include <wayland-server-protocol.h>
#include <wayland-server.h>
#include <wlr/backend.h>
#include <wlr/backend/session.h>
#include <wlr/render/wlr_renderer.h>
#include <wlr/types/wlr_keyboard.h>
#include <wlr/types/wlr_matrix.h>
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#include <wlr/types/wlr_input_device.h>
#include <wlr/types/wlr_output_layout.h>
#include <wlr/types/wlr_output.h>
#include <wlr/util/log.h>
#include <xkbcommon/xkbcommon.h>
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#include "cat.h"
struct sample_state {
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struct wl_display *display;
struct wl_listener new_output;
struct wl_listener new_input;
struct wlr_renderer *renderer;
struct wlr_texture *cat_texture;
struct wlr_output_layout *layout;
float x_offs, y_offs;
float x_vel, y_vel;
struct timespec ts_last;
};
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struct sample_output {
struct sample_state *sample;
struct wlr_output *output;
struct wl_listener frame;
struct wl_listener destroy;
};
struct sample_keyboard {
struct sample_state *sample;
struct wlr_input_device *device;
struct wl_listener key;
struct wl_listener destroy;
};
static void animate_cat(struct sample_state *sample,
struct wlr_output *output) {
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
long ms = (ts.tv_sec - sample->ts_last.tv_sec) * 1000 +
(ts.tv_nsec - sample->ts_last.tv_nsec) / 1000000;
// how many seconds have passed since the last time we animated
float seconds = ms / 1000.0f;
if (seconds > 0.1f) {
// XXX when we switch vt, the rendering loop stops so try to detect
// that and pause when it happens.
seconds = 0.0f;
}
// check for collisions and bounce
bool ur_collision = !wlr_output_layout_output_at(sample->layout,
sample->x_offs + 128, sample->y_offs);
bool ul_collision = !wlr_output_layout_output_at(sample->layout,
sample->x_offs, sample->y_offs);
bool ll_collision = !wlr_output_layout_output_at(sample->layout,
sample->x_offs, sample->y_offs + 128);
bool lr_collision = !wlr_output_layout_output_at(sample->layout,
sample->x_offs + 128, sample->y_offs + 128);
if (ur_collision && ul_collision && ll_collision && lr_collision) {
// oops we went off the screen somehow
struct wlr_output_layout_output *l_output =
wlr_output_layout_get(sample->layout, output);
sample->x_offs = l_output->x + 20;
sample->y_offs = l_output->y + 20;
} else if (ur_collision && ul_collision) {
sample->y_vel = fabs(sample->y_vel);
} else if (lr_collision && ll_collision) {
sample->y_vel = -fabs(sample->y_vel);
} else if (ll_collision && ul_collision) {
sample->x_vel = fabs(sample->x_vel);
} else if (ur_collision && lr_collision) {
sample->x_vel = -fabs(sample->x_vel);
} else {
if (ur_collision || lr_collision) {
sample->x_vel = -fabs(sample->x_vel);
}
if (ul_collision || ll_collision) {
sample->x_vel = fabs(sample->x_vel);
}
if (ul_collision || ur_collision) {
sample->y_vel = fabs(sample->y_vel);
}
if (ll_collision || lr_collision) {
sample->y_vel = -fabs(sample->y_vel);
}
}
sample->x_offs += sample->x_vel * seconds;
sample->y_offs += sample->y_vel * seconds;
sample->ts_last = ts;
}
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void output_frame_notify(struct wl_listener *listener, void *data) {
struct sample_output *output = wl_container_of(listener, output, frame);
struct sample_state *sample = output->sample;
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
struct wlr_output *wlr_output = output->output;
wlr_output_make_current(wlr_output, NULL);
wlr_renderer_begin(sample->renderer, wlr_output->width, wlr_output->height);
wlr_renderer_clear(sample->renderer, (float[]){0.25f, 0.25f, 0.25f, 1});
animate_cat(sample, output->output);
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struct wlr_box box = {
.x = sample->x_offs, .y = sample->y_offs,
.width = 128, .height = 128,
};
if (wlr_output_layout_intersects(sample->layout, output->output, &box)) {
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// transform global coordinates to local coordinates
double local_x = sample->x_offs;
double local_y = sample->y_offs;
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wlr_output_layout_output_coords(sample->layout, output->output,
&local_x, &local_y);
wlr_render_texture(sample->renderer, sample->cat_texture,
wlr_output->transform_matrix, local_x, local_y, 1.0f);
}
wlr_renderer_end(sample->renderer);
wlr_output_swap_buffers(wlr_output, NULL, NULL);
}
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static void update_velocities(struct sample_state *sample,
float x_diff, float y_diff) {
sample->x_vel += x_diff;
sample->y_vel += y_diff;
}
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void output_remove_notify(struct wl_listener *listener, void *data) {
struct sample_output *sample_output = wl_container_of(listener, sample_output, destroy);
struct sample_state *sample = sample_output->sample;
wlr_output_layout_remove(sample->layout, sample_output->output);
wl_list_remove(&sample_output->frame.link);
wl_list_remove(&sample_output->destroy.link);
free(sample_output);
}
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void new_output_notify(struct wl_listener *listener, void *data) {
struct wlr_output *output = data;
struct sample_state *sample = wl_container_of(listener, sample, new_output);
struct sample_output *sample_output = calloc(1, sizeof(struct sample_output));
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if (!wl_list_empty(&output->modes)) {
struct wlr_output_mode *mode = wl_container_of(output->modes.prev, mode, link);
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wlr_output_set_mode(output, mode);
}
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wlr_output_layout_add_auto(sample->layout, output);
sample_output->output = output;
sample_output->sample = sample;
wl_signal_add(&output->events.frame, &sample_output->frame);
sample_output->frame.notify = output_frame_notify;
wl_signal_add(&output->events.destroy, &sample_output->destroy);
sample_output->destroy.notify = output_remove_notify;
}
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void keyboard_key_notify(struct wl_listener *listener, void *data) {
struct sample_keyboard *keyboard = wl_container_of(listener, keyboard, key);
struct sample_state *sample = keyboard->sample;
struct wlr_event_keyboard_key *event = data;
uint32_t keycode = event->keycode + 8;
const xkb_keysym_t *syms;
int nsyms = xkb_state_key_get_syms(keyboard->device->keyboard->xkb_state,
keycode, &syms);
for (int i = 0; i < nsyms; i++) {
xkb_keysym_t sym = syms[i];
if (sym == XKB_KEY_Escape) {
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wl_display_terminate(sample->display);
}
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// NOTE: It may be better to simply refer to our key state during each frame
// and make this change in pixels/sec^2
// Also, key repeat
int delta = 75;
if (event->state == WLR_KEY_PRESSED) {
switch (sym) {
case XKB_KEY_Left:
update_velocities(sample, -delta, 0);
break;
case XKB_KEY_Right:
update_velocities(sample, delta, 0);
break;
case XKB_KEY_Up:
update_velocities(sample, 0, -delta);
break;
case XKB_KEY_Down:
update_velocities(sample, 0, delta);
break;
}
}
}
}
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void keyboard_destroy_notify(struct wl_listener *listener, void *data) {
struct sample_keyboard *keyboard = wl_container_of(listener, keyboard, destroy);
wl_list_remove(&keyboard->destroy.link);
wl_list_remove(&keyboard->key.link);
free(keyboard);
}
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void new_input_notify(struct wl_listener *listener, void *data) {
struct wlr_input_device *device = data;
struct sample_state *sample = wl_container_of(listener, sample, new_input);
switch (device->type) {
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case WLR_INPUT_DEVICE_KEYBOARD:;
struct sample_keyboard *keyboard = calloc(1, sizeof(struct sample_keyboard));
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keyboard->device = device;
keyboard->sample = sample;
wl_signal_add(&device->events.destroy, &keyboard->destroy);
keyboard->destroy.notify = keyboard_destroy_notify;
wl_signal_add(&device->keyboard->events.key, &keyboard->key);
keyboard->key.notify = keyboard_key_notify;
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struct xkb_rule_names rules = { 0 };
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rules.rules = getenv("XKB_DEFAULT_RULES");
rules.model = getenv("XKB_DEFAULT_MODEL");
rules.layout = getenv("XKB_DEFAULT_LAYOUT");
rules.variant = getenv("XKB_DEFAULT_VARIANT");
rules.options = getenv("XKB_DEFAULT_OPTIONS");
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struct xkb_context *context = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
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if (!context) {
wlr_log(L_ERROR, "Failed to create XKB context");
exit(1);
}
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wlr_keyboard_set_keymap(device->keyboard, xkb_map_new_from_names(context,
&rules, XKB_KEYMAP_COMPILE_NO_FLAGS));
xkb_context_unref(context);
break;
default:
break;
}
}
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int main(int argc, char *argv[]) {
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wlr_log_init(L_DEBUG, NULL);
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struct wl_display *display = wl_display_create();
struct sample_state state = {
.x_vel = 500,
.y_vel = 500,
.display = display,
};
state.layout = wlr_output_layout_create();
clock_gettime(CLOCK_MONOTONIC, &state.ts_last);
struct wlr_backend *wlr = wlr_backend_autocreate(display, NULL);
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if (!wlr) {
exit(1);
}
wl_signal_add(&wlr->events.new_output, &state.new_output);
state.new_output.notify = new_output_notify;
wl_signal_add(&wlr->events.new_input, &state.new_input);
state.new_input.notify = new_input_notify;
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state.renderer = wlr_backend_get_renderer(wlr);
state.cat_texture = wlr_texture_from_pixels(state.renderer,
WL_SHM_FORMAT_ABGR8888, cat_tex.width * 4, cat_tex.width, cat_tex.height,
cat_tex.pixel_data);
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if (!wlr_backend_start(wlr)) {
wlr_log(L_ERROR, "Failed to start backend");
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wlr_backend_destroy(wlr);
exit(1);
}
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wl_display_run(display);
wlr_texture_destroy(state.cat_texture);
wlr_renderer_destroy(state.renderer);
wlr_output_layout_destroy(state.layout);
}