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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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include/vgpu_stream.h
+15
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@@ -69,6 +69,18 @@ typedef struct {
uint32_t supported_formats; /* bitmask (1u<<VGPU_FMT_*) */
uint32_t ctrl_ack; /* echo of control.ctrl_gen (even) applied */
uint32_t full_frame_ack; /* echo of control.full_frame_req honored */
/* --- cursor reporting (host-RO; position is sensor data, independent
* of control.draw_cursor / cursor compositing) --- */
uint32_t cursor_seq; /* @168: monotonic; bumps each cursor publish.
Host reads it last (acquire) to gate a
consistent {cursor_pos,cursor_visible}; lets the
host tell "cursor idle" from "producer stopped
reporting". */
uint32_t cursor_visible; /* @172: 1=cursor shown (CURSOR_SHOWING), 0=hidden */
uint64_t cursor_pos; /* @176: packed screen position, 8-aligned single
atomic MOV. low 32 bits = x, high 32 = y, each a
signed int32 (two's-complement; multi-monitor →
negatives). Pair never tears (one 64-bit store). */
} vgpu_producer_t;
static_assert(alignof(vgpu_producer_t) == 64, "producer align");
static_assert(sizeof(vgpu_producer_t) <= VGPU_PAGE, "producer fits page 0");
@@ -86,6 +98,9 @@ static_assert(offsetof(vgpu_producer_t, applied_fps) == 152, "producer.app
static_assert(offsetof(vgpu_producer_t, supported_formats) == 156, "producer.supported_formats");
static_assert(offsetof(vgpu_producer_t, ctrl_ack) == 160, "producer.ctrl_ack");
static_assert(offsetof(vgpu_producer_t, full_frame_ack) == 164, "producer.full_frame_ack");
static_assert(offsetof(vgpu_producer_t, cursor_seq) == 168, "producer.cursor_seq");
static_assert(offsetof(vgpu_producer_t, cursor_visible) == 172, "producer.cursor_visible");
static_assert(offsetof(vgpu_producer_t, cursor_pos) == 176, "producer.cursor_pos");
/* ===== Control block (host-RW), own page, generation-guarded ===== */
typedef struct {