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[client] fix the HDR colorspace mapping to SDR

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This commit is contained in:
Geoffrey McRae
2026-07-16 20:25:20 +10:00
parent 4dd9d11cca
commit f8f5576359
1 changed files with 6 additions and 1 deletions
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7
client/renderers/EGL/shader/hdr.h
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@@ -102,7 +102,12 @@ vec3 bt2020to709(vec3 bt2020)
vec3 mapToSDR(vec3 color, float gain, bool pq) vec3 mapToSDR(vec3 color, float gain, bool pq)
{ {
if (pq) if (pq)
{
// HDR10: PQ-encoded BT.2020. Linearise then convert the gamut to BT.709.
color = pq2lin(color.rgb, gain); color = pq2lin(color.rgb, gain);
color = bt2020to709(color); color = bt2020to709(color);
}
// else: scRGB is already linear BT.709 (1.0 == SDR white), so no EOTF or
// gamut conversion is required - only highlight compression below.
return lin2srgb(compress(color)); return lin2srgb(compress(color));
} }