Redo frame buffering again.

[nageru] / input_state.h

diff --git a/input_state.h b/input_state.h
new file mode 100644 (file)
index 0000000..26015ef
--- /dev/null
+++ b/input_state.h
@@ -0,0 +1,24 @@
+#ifndef _INPUT_STATE_H
+#define _INPUT_STATE_H 1
+
+#include "defs.h"
+#include "ref_counted_frame.h"
+
+struct BufferedFrame {
+       RefCountedFrame frame;
+       unsigned field_number;
+};
+
+// Encapsulates the state of all inputs at any given instant.
+// In particular, this is captured by Theme::get_chain(),
+// so that it can hold on to all the frames it needs for rendering.
+struct InputState {
+       // For each card, the last three frames (or fields), with 0 being the
+       // most recent one. Note that we only need the actual history if we have
+       // interlaced output (for deinterlacing), so if we detect progressive input,
+       // we immediately clear out all history and all entries will point to the same
+       // frame.
+       BufferedFrame buffered_frames[MAX_CARDS][FRAME_HISTORY_LENGTH];
+};
+
+#endif  // !defined(_INPUT_STATE_H)