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-rw-r--r--example/example-drm.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/example/example-drm.c b/example/example-drm.c
new file mode 100644
index 00000000..4c944226
--- /dev/null
+++ b/example/example-drm.c
@@ -0,0 +1,109 @@
+#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);
+}