screen: add vsync and double buffering

1 files changed, 31 insertions, 0 deletions

diff --git a/src/screen/drm/event.zig b/src/screen/drm/event.zig
new file mode 100644
index 0000000..201ced3
--- /dev/null
+++ b/src/screen/drm/event.zig
@@ -0,0 +1,31 @@
+
+pub const EventType = enum(u32) {
+    vblank = 1,
+    page_flip_complete = 2,
+    crtc_sequence = 3,
+};
+
+pub const VBlankEvent = extern struct {
+    user_data: u64,
+    tv_sec: u32,
+    tv_usec: u32,
+    sequence: u32,
+    crtc_id: u32,
+};
+
+pub const CrtcSequenceEvent = extern struct {
+    user_data: u64,
+    time_ns: i64,
+    sequence: u64,
+};
+
+pub const EventPayload = extern union {
+    vblank: VBlankEvent,
+    crtc_sequence: CrtcSequenceEvent,
+};
+
+pub const Event = extern struct {
+    type: EventType,
+    length: u32,
+    payload: EventPayload,
+};