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[idd] add support to return HDR metadata to clients

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Geoffrey McRae
2026-07-15 18:35:22 +10:00
committed by Geoffrey McRae
parent 11b3ac00a8
commit 0c653c1fb2
8 changed files with 233 additions and 16 deletions
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30
idd/LGIdd/effect/CHDR16to10Effect.cpp
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@@ -36,14 +36,24 @@ bool CHDR16to10Effect::Init(const ComPtr<ID3D12Device3>& device)
const char * shader =
"cbuffer Constants : register(b0)\n"
"{\n"
" float SDRWhiteLevel;\n"
" float ReferenceWhiteNits;\n"
"};\n"
"Texture2D<float4> src : register(t0);\n"
"RWTexture2D<float4> dst : register(u0);\n"
"static const float PQ_m1 = 0.1593017578125;\n"
"static const float PQ_m2 = 78.84375;\n"
"static const float PQ_c1 = 0.8359375;\n"
"static const float PQ_c2 = 18.8515625;\n"
"static const float PQ_c3 = 18.6875;\n"
"[numthreads(" POST_PROCESS_THREADS_STR ", " POST_PROCESS_THREADS_STR ", 1)]\n"
"void main(uint3 dt : SV_DispatchThreadID)\n"
"{\n"
" dst[dt.xy] = float4(src[dt.xy].rgb * SDRWhiteLevel, src[dt.xy].a);\n"
" float3 linear = src[dt.xy].rgb * ReferenceWhiteNits;\n"
" // scRGB to PQ (ST.2084)\n"
" float3 Y = linear / 10000.0;\n"
" float3 Ym1 = pow(max(Y, 0.0), PQ_m1);\n"
" float3 pq = pow((PQ_c1 + PQ_c2 * Ym1) / (1.0 + PQ_c3 * Ym1), PQ_m2);\n"
" dst[dt.xy] = float4(pq, src[dt.xy].a);\n"
"}\n";
if (!InitCompute(device, ranges, ARRAYSIZE(ranges), nullptr, 0, shader))
@@ -99,10 +109,20 @@ PostProcessStatus CHDR16to10Effect::SetFormat(
m_threadsX = ((unsigned)desc.Width + (Threads - 1)) / Threads;
m_threadsY = ((unsigned)desc.Height + (Threads - 1)) / Threads;
dst.desc = desc;
dst.desc = desc;
dst.format = FRAME_TYPE_RGBA10;
dst.hdr = true;
dst.hdrPQ = false;
dst.hdr = true;
dst.hdrPQ = true;
// Explicitly propagate HDR static metadata so it survives post-processing.
// Do not rely on the caller's copy semantics in CPostProcessor::Configure().
memcpy(dst.displayPrimary, src.displayPrimary, sizeof(dst.displayPrimary));
memcpy(dst.whitePoint , src.whitePoint , sizeof(dst.whitePoint ));
dst.maxDisplayLuminance = src.maxDisplayLuminance;
dst.minDisplayLuminance = src.minDisplayLuminance;
dst.maxContentLightLevel = src.maxContentLightLevel;
dst.maxFrameAverageLightLevel = src.maxFrameAverageLightLevel;
return PostProcessStatus::SUCCESS;
}