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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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24
client/include/interface/transport.h
View File

@@ -59,6 +59,7 @@ enum
{
LG_TRANSPORT_FEATURE_SET_CURSOR_POS = 0x1,
LG_TRANSPORT_FEATURE_WINDOW_SIZE = 0x2,
LG_TRANSPORT_FEATURE_FRAME_SCHEDULE = 0x4,
};
typedef uint32_t LG_TransportFeatureFlags;
@@ -133,6 +134,7 @@ typedef struct LG_TransportFrame
{
uint64_t serial;
uint64_t timestamp;
uint32_t scheduleGeneration;
LG_TransportFrameFlags flags;
// Backend-owned immutable metadata, valid until releaseFrame.
const LG_TransportFrameFormat * format;
@@ -176,9 +178,20 @@ typedef enum LG_TransportControlType
{
LG_TRANSPORT_CONTROL_SET_CURSOR_POS,
LG_TRANSPORT_CONTROL_WINDOW_SIZE,
LG_TRANSPORT_CONTROL_FRAME_SCHEDULE,
}
LG_TransportControlType;
enum
{
LG_TRANSPORT_FRAME_SCHEDULE_ACTIVE = 0x1,
LG_TRANSPORT_FRAME_SCHEDULE_RELEASE = 0x2,
LG_TRANSPORT_FRAME_SCHEDULE_RESET = 0x4,
LG_TRANSPORT_FRAME_SCHEDULE_IMMEDIATE = 0x8,
};
typedef uint32_t LG_TransportFrameScheduleFlags;
typedef struct LG_TransportControl
{
LG_TransportControlType type;
@@ -186,6 +199,17 @@ typedef struct LG_TransportControl
{
struct { int32_t x, y; } cursorPos;
struct { uint32_t width, height; } windowSize;
struct
{
uint32_t generation;
LG_TransportFrameScheduleFlags flags;
uint64_t period;
uint64_t targetSlack;
int64_t phaseError;
uint32_t feedbackFrameSerial;
uint32_t lease;
}
frameSchedule;
};
}
LG_TransportControl;

30
client/transports/LGMP/lgmp.c
View File

@@ -59,6 +59,7 @@ struct LG_Transport
bool connected;
bool framePending;
const KVMFRFrame * pendingFrame;
uint32_t clientID;
uint32_t frameSerial;
bool formatValid;
LG_TransportFrameFormat format;
@@ -297,6 +298,8 @@ static bool lgmp_parseSession(const uint8_t * data, uint32_t size,
session->features |= LG_TRANSPORT_FEATURE_SET_CURSOR_POS;
if (header->features & KVMFR_FEATURE_WINDOWSIZE)
session->features |= LG_TRANSPORT_FEATURE_WINDOW_SIZE;
if (header->features & KVMFR_FEATURE_FRAME_SCHEDULE)
session->features |= LG_TRANSPORT_FEATURE_FRAME_SCHEDULE;
data += sizeof(*header);
size -= sizeof(*header);
@@ -359,8 +362,8 @@ static LG_TransportStatus lgmp_connect(LG_Transport * this,
uint32_t size;
uint8_t * data;
uint32_t remoteVersion;
LGMP_STATUS status = lgmpClientSessionInit(this->client, &size, &data, NULL,
&remoteVersion);
LGMP_STATUS status = lgmpClientSessionInit(this->client, &size, &data,
&this->clientID, &remoteVersion);
session->remoteVersion = remoteVersion;
switch (status)
{
@@ -390,6 +393,7 @@ static void lgmp_disconnect(LG_Transport * this)
lgmp_closeQueues(this);
lgmp_closeDMA(this);
this->connected = false;
this->clientID = 0;
}
static bool lgmp_sessionValid(LG_Transport * this)
@@ -538,7 +542,8 @@ static LG_TransportStatus lgmp_nextFrame(LG_Transport * this, bool useDMA,
this->frameSerial = frame->frameSerial;
memset(result, 0, sizeof(*result));
result->serial = frame->frameSerial;
result->serial = frame->frameSerial;
result->scheduleGeneration = message.udata;
if (frame->flags & FRAME_FLAG_BLOCK_SCREENSAVER)
result->flags |= LG_TRANSPORT_FRAME_BLOCK_SCREENSAVER;
if (frame->flags & FRAME_FLAG_REQUEST_ACTIVATION)
@@ -763,7 +768,7 @@ static void lgmp_releasePointer(LG_Transport * this,
static LG_TransportStatus lgmp_sendControl(LG_Transport * this,
const LG_TransportControl * control, LG_TransportControlToken * token)
{
uint8_t buffer[sizeof(KVMFRWindowSize)];
uint8_t buffer[LGMP_MSGS_SIZE];
uint32_t size;
switch (control->type)
{
@@ -789,6 +794,23 @@ static LG_TransportStatus lgmp_sendControl(LG_Transport * this,
size = sizeof(message);
break;
}
case LG_TRANSPORT_CONTROL_FRAME_SCHEDULE:
{
const KVMFRFrameSchedule message = {
.msg.type = KVMFR_MESSAGE_FRAME_SCHEDULE,
.clientID = this->clientID,
.generation = control->frameSchedule.generation,
.flags = control->frameSchedule.flags,
.period = control->frameSchedule.period,
.targetSlack = control->frameSchedule.targetSlack,
.phaseError = control->frameSchedule.phaseError,
.feedbackFrameSerial = control->frameSchedule.feedbackFrameSerial,
.lease = control->frameSchedule.lease,
};
memcpy(buffer, &message, sizeof(message));
size = sizeof(message);
break;
}
default:
return LG_TRANSPORT_ERROR;
}