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[idd] use the actual surface colorspace instead of guessing

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This commit is contained in:
Geoffrey McRae
2026-07-16 20:24:23 +10:00
parent 4734a4028a
commit ef8a4e2923
2 changed files with 75 additions and 51 deletions
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123
idd/LGIdd/CSwapChainProcessor.cpp
View File

@@ -161,6 +161,11 @@ bool CSwapChainProcessor::SwapChainThreadCore()
UINT dirtyRectCount = 0;
ComPtr<IDXGIResource> surface;
// The surface colour space is the source of truth for the content format.
// Only the buffer2 acquisition path (IddCx 1.10+) reports it; on the legacy
// path HDR is not available, so default to SDR.
DXGI_COLOR_SPACE_TYPE colorSpace = DXGI_COLOR_SPACE_RGB_FULL_G22_NONE_P709;
#ifdef HAS_IDDCX_110
if (m_devContext->CanProcessFP16())
{
@@ -177,6 +182,7 @@ bool CSwapChainProcessor::SwapChainThreadCore()
frameNumber = buffer.MetaData.PresentationFrameNumber;
dirtyRectCount = buffer.MetaData.DirtyRectCount;
surface = buffer.MetaData.pSurface;
colorSpace = buffer.MetaData.SurfaceColorSpace;
}
}
else
@@ -216,7 +222,7 @@ bool CSwapChainProcessor::SwapChainThreadCore()
if (frameNumber != lastFrameNumber)
{
lastFrameNumber = frameNumber;
SwapChainNewFrame(surface, dirtyRectCount);
SwapChainNewFrame(surface, dirtyRectCount, colorSpace);
// report that all GPU processing for this frame has been queued
hr = IddCxSwapChainFinishedProcessingFrame(m_hSwapChain);
@@ -327,7 +333,8 @@ static FrameType GetFrameType(DXGI_FORMAT format)
}
}
bool CSwapChainProcessor::SwapChainNewFrame(ComPtr<IDXGIResource> acquiredBuffer, unsigned dirtyRectCount)
bool CSwapChainProcessor::SwapChainNewFrame(ComPtr<IDXGIResource> acquiredBuffer, unsigned dirtyRectCount,
DXGI_COLOR_SPACE_TYPE colorSpace)
{
ComPtr<ID3D11Texture2D> texture;
HRESULT hr = acquiredBuffer.As(&texture);
@@ -380,58 +387,74 @@ bool CSwapChainProcessor::SwapChainNewFrame(ComPtr<IDXGIResource> acquiredBuffer
srcFormat.height = srcDesc.Height;
srcFormat.format = GetFrameType(srcDesc.Format);
// Only HDR-capable formats can carry HDR content.
// 8-bit formats (BGRA, RGBA) cannot represent HDR,
// even if IsHDRActive() is momentarily stale during mode switches.
if (srcDesc.Format != DXGI_FORMAT_R16G16B16A16_FLOAT &&
srcDesc.Format != DXGI_FORMAT_R10G10B10A2_UNORM)
switch (colorSpace)
{
srcFormat.hdr = false;
srcFormat.hdrPQ = false;
}
else if (srcDesc.Format == DXGI_FORMAT_R16G16B16A16_FLOAT)
{
// FP16 is HDR content (scRGB / linear, not PQ-curve).
// FP16 always carries HDR color data regardless of OS HDR mode,
// but metadata (primaries, luminances) may be unavailable.
srcFormat.hdr = true;
srcFormat.hdrPQ = false;
if (!m_devContext->GetHDRMetadata(srcFormat))
{
// No HDR metadata from the OS; provide reasonable defaults
// so downstream consumers have valid primaries and luminances.
// BT.709/sRGB primaries (in 0.00002 units):
srcFormat.displayPrimary[0][0] = 13250; // Rx
srcFormat.displayPrimary[0][1] = 34500; // Ry
srcFormat.displayPrimary[1][0] = 7500; // Gx
srcFormat.displayPrimary[1][1] = 30000; // Gy
srcFormat.displayPrimary[2][0] = 34000; // Bx
srcFormat.displayPrimary[2][1] = 16000; // By
// D65 white point (in 0.00002 units):
srcFormat.whitePoint[0] = 15635;
srcFormat.whitePoint[1] = 16450;
// Mastering luminances follow SMPTE ST 2086 units: max in whole cd/m²,
// min in 0.0001 cd/m². 80 cd/m² display, 0.005 cd/m² black:
srcFormat.maxDisplayLuminance = 80;
srcFormat.minDisplayLuminance = 50;
// Content light levels unknown:
srcFormat.maxContentLightLevel = 0;
srcFormat.maxFrameAverageLightLevel = 0;
}
}
else if (m_devContext->CanProcessFP16() && m_devContext->IsHDRActive())
{
// Non-FP16 format (e.g., RGBA10) with OS HDR mode active.
// Windows applies the PQ (ST.2084) transfer function for non-FP16 HDR.
srcFormat.hdr = true;
srcFormat.hdrPQ = true;
case DXGI_COLOR_SPACE_RGB_FULL_G2084_NONE_P2020:
case DXGI_COLOR_SPACE_RGB_STUDIO_G2084_NONE_P2020:
// HDR10: BT.2020 primaries with the PQ (ST.2084) transfer function
// already applied to the pixel data.
srcFormat.hdr = true;
srcFormat.hdrPQ = true;
if (!m_devContext->GetHDRMetadata(srcFormat))
{
// HDR is active but the OS has not delivered static metadata yet
// (e.g. a brief window during a mode switch). The pixels are still
// PQ-encoded, so keep the PQ flag and supply BT.2020/PQ defaults
// rather than mislabel the frame as SDR.
// BT.2020 primaries (in 0.00002 units):
srcFormat.displayPrimary[0][0] = 35400; // Rx
srcFormat.displayPrimary[0][1] = 14600; // Ry
srcFormat.displayPrimary[1][0] = 8500; // Gx
srcFormat.displayPrimary[1][1] = 39850; // Gy
srcFormat.displayPrimary[2][0] = 6550; // Bx
srcFormat.displayPrimary[2][1] = 2300; // By
// D65 white point (in 0.00002 units):
srcFormat.whitePoint[0] = 15635;
srcFormat.whitePoint[1] = 16450;
// Mastering luminances follow SMPTE ST 2086 units: max in whole cd/m²,
// min in 0.0001 cd/m². 1000 cd/m² display, 0.0001 cd/m² black:
srcFormat.maxDisplayLuminance = 1000;
srcFormat.minDisplayLuminance = 1;
// Content light levels unknown:
srcFormat.maxContentLightLevel = 0;
srcFormat.maxFrameAverageLightLevel = 0;
}
break;
// Load HDR metadata; if none is available the frame is not HDR.
if (!m_devContext->GetHDRMetadata(srcFormat))
{
case DXGI_COLOR_SPACE_RGB_FULL_G10_NONE_P709:
// scRGB: linear (FP16) content with BT.709 primaries. HDR, but the PQ
// curve has not been applied.
srcFormat.hdr = true;
srcFormat.hdrPQ = false;
if (!m_devContext->GetHDRMetadata(srcFormat))
{
// No HDR metadata from the OS; provide reasonable defaults
// so downstream consumers have valid primaries and luminances.
// BT.709/sRGB primaries (in 0.00002 units):
srcFormat.displayPrimary[0][0] = 13250; // Rx
srcFormat.displayPrimary[0][1] = 34500; // Ry
srcFormat.displayPrimary[1][0] = 7500; // Gx
srcFormat.displayPrimary[1][1] = 30000; // Gy
srcFormat.displayPrimary[2][0] = 34000; // Bx
srcFormat.displayPrimary[2][1] = 16000; // By
// D65 white point (in 0.00002 units):
srcFormat.whitePoint[0] = 15635;
srcFormat.whitePoint[1] = 16450;
// Mastering luminances follow SMPTE ST 2086 units: max in whole cd/m²,
// min in 0.0001 cd/m². 80 cd/m² display, 0.005 cd/m² black:
srcFormat.maxDisplayLuminance = 80;
srcFormat.minDisplayLuminance = 50;
// Content light levels unknown:
srcFormat.maxContentLightLevel = 0;
srcFormat.maxFrameAverageLightLevel = 0;
}
break;
default:
// Everything else (e.g. RGB_FULL_G22_NONE_P709) is SDR.
srcFormat.hdr = false;
srcFormat.hdrPQ = false;
}
break;
}
bool postProcessFormatChanged = false;

3
idd/LGIdd/CSwapChainProcessor.h
View File

@@ -70,7 +70,8 @@ private:
static void CompletionFunction(
CD3D12CommandQueue * queue, bool result, void * param1, void * param2);
bool SwapChainNewFrame(ComPtr<IDXGIResource> acquiredBuffer, unsigned dirtyRectCount);
bool SwapChainNewFrame(ComPtr<IDXGIResource> acquiredBuffer, unsigned dirtyRectCount,
DXGI_COLOR_SPACE_TYPE colorSpace);
public:
CSwapChainProcessor(IDDCX_MONITOR monitor, CIndirectDeviceContext * devContext, IDDCX_SWAPCHAIN hSwapChain,