diff options
| author | thexai <58434170+thexai@users.noreply.github.com> | 2020-10-18 18:01:36 +0200 |
|---|---|---|
| committer | thexai <58434170+thexai@users.noreply.github.com> | 2020-10-21 09:35:50 +0200 |
| commit | fd779679bbfa12d23c58f0f65f10bb76e5dd108c (patch) | |
| tree | 033f53cfcdaa863d2bfe851f4e4e83d7bdca72ce /system | |
| parent | 77747c4e6d91cc465bd30f1c5657c170fe80204b (diff) | |
[Windows] Enables HLG HDR passthrough using HLG to PQ shaders
Diffstat (limited to 'system')
| -rw-r--r-- | system/shaders/output_d3d.fx | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/system/shaders/output_d3d.fx b/system/shaders/output_d3d.fx index ef72be6c58..06233b692f 100644 --- a/system/shaders/output_d3d.fx +++ b/system/shaders/output_d3d.fx @@ -50,6 +50,34 @@ float tonemap(float val) return val * (1 + val/(g_toneP1*g_toneP1))/(1 + val); } #endif +#if defined(KODI_HLG_TO_PQ) +float inverseHLG(float x) +{ + const float B67_a = 0.17883277; + const float B67_b = 0.28466892; + const float B67_c = 0.55991073; + const float B67_inv_r2 = 4.0; + if (x <= 0.5) + x = x * x * B67_inv_r2; + else + x = exp((x - B67_c) / B67_a) + B67_b; + return x; +} + +float4 tranferPQ(float4 color) +{ + const float ST2084_m1 = 2610.0 / (4096.0 * 4.0); + const float ST2084_m2 = (2523.0 / 4096.0) * 128.0; + const float ST2084_c1 = 3424.0 / 4096.0; + const float ST2084_c2 = (2413.0 / 4096.0) * 32.0; + const float ST2084_c3 = (2392.0 / 4096.0) * 32.0; + color = pow(color / 1000.0, ST2084_m1); + color = (ST2084_c1 + ST2084_c2 * color) / (1 + ST2084_c3 * color); + color = pow(color, ST2084_m2); + return color; +} +#endif + float4 output4(float4 color, float2 uv) { @@ -57,6 +85,15 @@ float4 output4(float4 color, float2 uv) float luma = dot(color.rgb, g_coefsDst); color.rgb *= tonemap(luma) / luma; #endif +#if defined(KODI_HLG_TO_PQ) + color.r = inverseHLG(color.r); + color.g = inverseHLG(color.g); + color.b = inverseHLG(color.b); + float3 ootf_2020 = float3(0.2627, 0.6780, 0.0593); + float ootf_ys = 2000.0 * dot(ootf_2020, color); + color = color * pow(ootf_ys, 0.200); + color = tranferPQ(color); +#endif #if defined(KODI_3DLUT) half3 scale = m_LUTParams.x; half3 offset = m_LUTParams.y; |