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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>
struct state {
float color[3];
int dec;
struct timespec last_frame;
struct wl_listener add;
struct wl_listener rem;
struct wl_listener render;
};
void display_add(struct wl_listener *listener, void *data)
{
struct wlr_drm_display *disp = data;
fprintf(stderr, "Display added\n");
wlr_drm_display_modeset(disp, "preferred");
}
void display_rem(struct wl_listener *listener, void *data)
{
fprintf(stderr, "Display removed\n");
}
void display_render(struct wl_listener *listener, void *data)
{
struct wlr_drm_display *disp = data;
struct state *s = wl_container_of(listener, s, render);
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_display_begin(disp);
glClearColor(s->color[0], s->color[1], s->color[2], 1.0);
glClear(GL_COLOR_BUFFER_BIT);
wlr_drm_display_end(disp);
}
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,
.add = { .notify = display_add },
.rem = { .notify = display_rem },
.render = { .notify = display_render },
};
wl_list_init(&state.add.link);
wl_list_init(&state.rem.link);
wl_list_init(&state.render.link);
clock_gettime(CLOCK_MONOTONIC, &state.last_frame);
struct wlr_drm_backend *wlr = wlr_drm_backend_init(&state.add, &state.rem, &state.render);
bool done = false;
struct wl_event_loop *event_loop = wlr_drm_backend_get_event_loop(wlr);
struct wl_event_source *timer = wl_event_loop_add_timer(event_loop,
timer_done, &done);
wl_event_source_timer_update(timer, 10000);
while (!done)
wl_event_loop_dispatch(event_loop, 0);
wl_event_source_remove(timer);
wlr_drm_backend_free(wlr);
}
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