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#define _POSIX_C_SOURCE 199309L
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <wayland-server.h>
#include <GLES3/gl3.h>
#include <wlr/backend/drm.h>
#include <wlr/session.h>
#include <wlr/common/list.h>
struct state {
float color[3];
int dec;
struct timespec last_frame;
struct wl_listener output_add;
struct wl_listener output_remove;
list_t *outputs;
};
struct output_state {
struct wlr_output *output;
struct state *state;
struct wl_listener frame;
};
void output_frame(struct wl_listener *listener, void *data) {
struct wlr_output *output = data;
struct output_state *ostate = wl_container_of(
listener, ostate, frame);
struct state *s = ostate->state;
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
long ms = (now.tv_sec - s->last_frame.tv_sec) * 1000 +
(now.tv_nsec - s->last_frame.tv_nsec) / 1000000;
int inc = (s->dec + 1) % 3;
s->color[inc] += ms / 2000.0f;
s->color[s->dec] -= ms / 2000.0f;
if (s->color[s->dec] < 0.0f) {
s->color[inc] = 1.0f;
s->color[s->dec] = 0.0f;
s->dec = inc;
}
s->last_frame = now;
wlr_drm_output_begin(output);
glClearColor(s->color[0], s->color[1], s->color[2], 1.0);
glClear(GL_COLOR_BUFFER_BIT);
wlr_drm_output_end(output);
}
void output_add(struct wl_listener *listener, void *data) {
struct wlr_output *output = data;
struct state *state = wl_container_of(listener, state, output_add);
fprintf(stderr, "Output '%s' added\n", output->name);
wlr_output_set_mode(output, output->modes->items[0]);
struct output_state *ostate = calloc(1, sizeof(struct output_state));
ostate->output = output;
ostate->state = state;
ostate->frame.notify = output_frame;
wl_list_init(&ostate->frame.link);
wl_signal_add(&output->events.frame, &ostate->frame);
list_add(state->outputs, ostate);
}
void output_remove(struct wl_listener *listener, void *data) {
struct wlr_output *output = data;
fprintf(stderr, "Output '%s' removed\n", output->name);
// TODO: remove signal from state->output_frame
}
int timer_done(void *data) {
*(bool *)data = true;
return 1;
}
int main() {
if (getenv("DISPLAY")) {
fprintf(stderr, "Detected that X is running. Run this in its own virtual terminal.\n");
return 1;
} else if (getenv("WAYLAND_DISPLAY")) {
fprintf(stderr, "Detected that Wayland is running. Run this in its own virtual terminal.\n");
return 1;
}
struct state state = {
.color = { 1.0, 0.0, 0.0 },
.dec = 0,
.output_add = { .notify = output_add },
.output_remove = { .notify = output_remove },
.outputs = list_create(),
};
wl_list_init(&state.output_add.link);
wl_list_init(&state.output_remove.link);
clock_gettime(CLOCK_MONOTONIC, &state.last_frame);
struct wl_display *display = wl_display_create();
struct wl_event_loop *event_loop = wl_display_get_event_loop(display);
struct wlr_session *session = wlr_session_start();
if (!session) {
return 1;
}
struct wlr_backend *wlr = wlr_drm_backend_create(display, session);
wl_signal_add(&wlr->events.output_add, &state.output_add);
wl_signal_add(&wlr->events.output_remove, &state.output_remove);
if (!wlr || !wlr_backend_init(wlr)) {
return 1;
}
bool done = false;
struct wl_event_source *timer = wl_event_loop_add_timer(event_loop,
timer_done, &done);
wl_event_source_timer_update(timer, 5000);
while (!done) {
wl_event_loop_dispatch(event_loop, 0);
}
wl_event_source_remove(timer);
wlr_backend_destroy(wlr);
wl_display_destroy(display);
}
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