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[idd] transport: abstract LGMP implementation

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Introduce transport, frame, and control interfaces with an LGMP factory
backend.

Move LGMP and IVSHMEM implementation details under transport/lgmp and
expose direct frame-buffer memory through a neutral capability.
This commit is contained in:
Geoffrey McRae
2026-08-07 16:39:07 +10:00
parent 30a1383d5e
commit 6725133375
46 changed files with 1026 additions and 480 deletions
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39
idd/LGIdd/display/CDisplayConfiguration.cpp
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@@ -21,7 +21,6 @@
#include "display/CDisplayConfiguration.h"
#include "CDebug.h"
#include "common/LGMPConfig.h"
#include "util/CSRWLock.h"
#include <d3d12.h>
@@ -59,12 +58,12 @@ bool CDisplayConfiguration::CalculateFrameSize(
bool CDisplayConfiguration::GetResolutionMemoryRequirements(
uint32_t width, uint32_t height, UINT64 alignment,
const FrameMemoryLimits& limits, UINT64& frameSize, UINT64& sharedSize)
const FrameMemoryLimits& limits, UINT64& frameSize, UINT64& requiredSize)
{
frameSize = 0;
sharedSize = 0;
frameSize = 0;
requiredSize = 0;
if (!alignment || !limits.frameMemoryOffset ||
if (!alignment || !limits.frameMemoryOffset || !limits.bufferCount ||
!CalculateFrameSize(width, height, frameSize))
return false;
@@ -76,12 +75,12 @@ bool CDisplayConfiguration::GetResolutionMemoryRequirements(
if (!AlignUp(limits.frameMemoryOffset, alignment, frameMemoryStart))
return false;
sharedSize = frameMemoryStart +
frameAllocationSize * LGMP_Q_FRAME_BUFFER_LEN;
requiredSize = frameMemoryStart +
frameAllocationSize * limits.bufferCount;
return true;
}
uint32_t CDisplayConfiguration::RecommendedIVSHMEMSizeMiB(
uint32_t CDisplayConfiguration::RecommendedMemorySizeMiB(
UINT64 requiredSize)
{
UINT64 sizeMiB = requiredSize / 1048576;
@@ -135,10 +134,10 @@ bool CDisplayConfiguration::LoadModes(const FrameMemoryLimits& limits)
for (const auto& configuredMode : configuredModes)
{
UINT64 frameSize;
UINT64 requiredIVSHMEMSize;
UINT64 requiredMemorySize;
if (!GetResolutionMemoryRequirements(configuredMode.width,
configuredMode.height, alignment, limits, frameSize,
requiredIVSHMEMSize))
requiredMemorySize))
{
DEBUG_WARN("Filtering invalid %s mode %ux%u@%.3f",
configuredMode.extraMode ? "extra" : "configured",
@@ -147,15 +146,15 @@ bool CDisplayConfiguration::LoadModes(const FrameMemoryLimits& limits)
continue;
}
if (requiredIVSHMEMSize > limits.sharedSize)
if (requiredMemorySize > limits.capacity)
{
DEBUG_WARN(
"Filtering %s mode %ux%u@%.3f: requires %llu bytes of IVSHMEM, only %llu bytes are available",
"Filtering %s mode %ux%u@%.3f: requires %llu bytes of transport memory, only %llu bytes are available",
configuredMode.extraMode ? "extra" : "configured",
configuredMode.width, configuredMode.height,
configuredMode.refreshMilliHz / 1000.0,
(unsigned long long)requiredIVSHMEMSize,
(unsigned long long)limits.sharedSize);
(unsigned long long)requiredMemorySize,
(unsigned long long)limits.capacity);
continue;
}
@@ -170,7 +169,7 @@ bool CDisplayConfiguration::LoadModes(const FrameMemoryLimits& limits)
if (newModes.empty())
{
DEBUG_ERROR("No configured display modes fit in IVSHMEM");
DEBUG_ERROR("No configured display modes fit in transport memory");
return false;
}
@@ -225,20 +224,20 @@ CDisplayConfiguration::SetResolution(
ResolutionResult result;
UINT64 frameSize;
UINT64 requiredIVSHMEMSize;
UINT64 requiredMemorySize;
if (!GetResolutionMemoryRequirements(width, height, limits.alignment,
limits, frameSize, requiredIVSHMEMSize))
limits, frameSize, requiredMemorySize))
{
DEBUG_WARN("Ignoring invalid resolution request: %ux%u", width, height);
return result;
}
if (requiredIVSHMEMSize > limits.sharedSize)
if (requiredMemorySize > limits.capacity)
{
result.status = ResolutionStatus::TOO_LARGE;
result.requiredMiB = RecommendedIVSHMEMSizeMiB(requiredIVSHMEMSize);
result.requiredMiB = RecommendedMemorySizeMiB(requiredMemorySize);
DEBUG_WARN(
"Refusing resolution %ux%u: frame requires %llu bytes, only %llu bytes are available; IVSHMEM must be at least %u MiB",
"Refusing resolution %ux%u: frame requires %llu bytes, only %llu bytes are available; transport memory must be at least %u MiB",
width, height,
(unsigned long long)frameSize,
(unsigned long long)limits.maxFrameSize,