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feat: report on-screen cursor position in producer contract

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Append cursor_seq/cursor_visible/cursor_pos to the producer block
(host-RO ABI; offsets 168/172/176, existing layout unchanged). Position
is reported every pump tick, independent of draw_cursor, so a consumer
can overlay its own cursor even when the producer does not composite it.

x and y pack into one 8-aligned 64-bit field (single atomic store, no
tear); cursor_seq bumps last to gate a consistent read. Adds the
vgpu_publish_cursor() engine setter and a lightweight cursor_sample_pos()
(position/visibility only, no shape extract) called from the pump.
This commit is contained in:
Gregory Lirent
2026-06-18 22:06:55 +03:00
parent 9f1b41cf78
commit 977c056287
6 changed files with 52 additions and 0 deletions
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src/stream/include/stream.h
+7
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@@ -53,4 +53,11 @@ void vgpu_bump_run_epoch(const vgpu_region_view* rv);
void vgpu_tick_heartbeat(const vgpu_region_view* rv);
void vgpu_publish_full_frame_ack(const vgpu_region_view* rv, uint32_t req);
/* Publish the on-screen cursor position (host-RO). Position is sensor data and is
* reported independent of control.draw_cursor (host may draw its own overlay even when the
* producer does not composite the cursor). x,y are screen coords (signed; multi-monitor may
* be negative); visible!=0 when the cursor is shown. Packs x|y into one 8-aligned 64-bit
* field (single atomic store) and bumps cursor_seq last. */
void vgpu_publish_cursor(const vgpu_region_view* rv, int32_t x, int32_t y, uint32_t visible);
#endif /* VGPU_STREAM_ENGINE_H */