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[common] add frame scheduling protocol

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This commit is contained in:
Geoffrey McRae
2026-08-04 12:56:15 +10:00
parent 84d1427cab
commit 5626cfa55b
3 changed files with 94 additions and 8 deletions
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48
common/include/common/KVMFR.h
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@@ -30,7 +30,7 @@
#include "LGMPConfig.h"
#define KVMFR_MAGIC "KVMFR---"
#define KVMFR_VERSION 25
#define KVMFR_VERSION 26
// Fallback used by producers that cannot report the source display's SDR
// white level. IDD frames override this with IDDCX_METADATA2::SdrWhiteLevel.
@@ -59,8 +59,9 @@ typedef uint32_t KVMFRCursorFlags;
enum
{
KVMFR_FEATURE_SETCURSORPOS = 0x1,
KVMFR_FEATURE_WINDOWSIZE = 0x2
KVMFR_FEATURE_SETCURSORPOS = 0x1,
KVMFR_FEATURE_WINDOWSIZE = 0x2,
KVMFR_FEATURE_FRAME_SCHEDULE = 0x4
};
typedef uint32_t KVMFRFeatureFlags;
@@ -68,7 +69,8 @@ typedef uint32_t KVMFRFeatureFlags;
enum
{
KVMFR_MESSAGE_SETCURSORPOS,
KVMFR_MESSAGE_WINDOWSIZE
KVMFR_MESSAGE_WINDOWSIZE,
KVMFR_MESSAGE_FRAME_SCHEDULE
};
typedef uint32_t KVMFRMessageType;
@@ -268,6 +270,44 @@ typedef struct KVMFRWindowSize
}
KVMFRWindowSize;
enum
{
KVMFR_FRAME_SCHEDULE_ACTIVE = 0x1,
KVMFR_FRAME_SCHEDULE_RELEASE = 0x2,
KVMFR_FRAME_SCHEDULE_RESET = 0x4,
KVMFR_FRAME_SCHEDULE_IMMEDIATE = 0x8
};
typedef uint32_t KVMFRFrameScheduleFlags;
/*
* Client presentation scheduling is expressed entirely as durations. Client
* and producer monotonic clocks have unrelated epochs and must never be
* compared directly.
*/
typedef struct KVMFRFrameSchedule
{
KVMFRMessage msg;
uint32_t clientID;
uint32_t generation;
KVMFRFrameScheduleFlags flags;
uint64_t period;
uint64_t targetSlack;
int64_t phaseError;
uint32_t feedbackFrameSerial;
uint32_t lease;
uint8_t reserved[16];
}
KVMFRFrameSchedule;
#if defined(__cplusplus)
static_assert(sizeof(KVMFRFrameSchedule) == 64,
"KVMFR frame schedule must fit in one LGMP control message");
#elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
_Static_assert(sizeof(KVMFRFrameSchedule) == 64,
"KVMFR frame schedule must fit in one LGMP control message");
#endif
#ifdef _MSC_VER
#pragma warning(pop)
#endif