110 lines
2.4 KiB
C
110 lines
2.4 KiB
C
#define _POSIX_C_SOURCE 199309L
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <wayland-server.h>
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#include <GLES3/gl3.h>
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#include <wlr/backend/drm.h>
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struct state {
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float color[3];
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int dec;
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struct timespec last_frame;
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struct wl_listener add;
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struct wl_listener rem;
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struct wl_listener render;
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};
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void display_add(struct wl_listener *listener, void *data)
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{
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struct wlr_drm_display *disp = data;
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fprintf(stderr, "Display added\n");
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wlr_drm_display_modeset(disp, "preferred");
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}
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void display_rem(struct wl_listener *listener, void *data)
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{
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fprintf(stderr, "Display removed\n");
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}
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void display_render(struct wl_listener *listener, void *data)
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{
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struct wlr_drm_display *disp = data;
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struct state *s = wl_container_of(listener, s, render);
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struct timespec now;
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clock_gettime(CLOCK_MONOTONIC, &now);
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long ms = (now.tv_sec - s->last_frame.tv_sec) * 1000 +
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(now.tv_nsec - s->last_frame.tv_nsec) / 1000000;
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int inc = (s->dec + 1) % 3;
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s->color[inc] += ms / 2000.0f;
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s->color[s->dec] -= ms / 2000.0f;
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if (s->color[s->dec] < 0.0f) {
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s->color[inc] = 1.0f;
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s->color[s->dec] = 0.0f;
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s->dec = inc;
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}
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s->last_frame = now;
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wlr_drm_display_begin(disp);
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glClearColor(s->color[0], s->color[1], s->color[2], 1.0);
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glClear(GL_COLOR_BUFFER_BIT);
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wlr_drm_display_end(disp);
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}
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int timer_done(void *data)
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{
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*(bool *)data = true;
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return 1;
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}
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int main()
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{
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if (getenv("DISPLAY")) {
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fprintf(stderr, "Detected that X is running. Run this in its own virtual terminal.\n");
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return 1;
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} else if (getenv("WAYLAND_DISPLAY")) {
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fprintf(stderr, "Detected that Wayland is running. Run this in its own virtual terminal.\n");
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return 1;
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}
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struct state state = {
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.color = { 1.0, 0.0, 0.0 },
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.dec = 0,
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.add = { .notify = display_add },
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.rem = { .notify = display_rem },
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.render = { .notify = display_render },
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};
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wl_list_init(&state.add.link);
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wl_list_init(&state.rem.link);
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wl_list_init(&state.render.link);
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clock_gettime(CLOCK_MONOTONIC, &state.last_frame);
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struct wlr_drm_backend *wlr = wlr_drm_backend_init(&state.add, &state.rem, &state.render);
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bool done = false;
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struct wl_event_loop *event_loop = wlr_drm_backend_get_event_loop(wlr);
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struct wl_event_source *timer = wl_event_loop_add_timer(event_loop,
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timer_done, &done);
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wl_event_source_timer_update(timer, 10000);
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while (!done)
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wl_event_loop_dispatch(event_loop, 0);
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wl_event_source_remove(timer);
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wlr_drm_backend_free(wlr);
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}
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