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libraries/effect/src/main/assets/shaders/insert_ultra_hdr.glsl
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| // The value is calculated as targetHdrPeakBrightnessInNits / | ||
| // targetSdrWhitePointInNits. In other effect HDR processing and some parts of | ||
| // the wider android ecosystem the assumption is | ||
| // targetHdrPeakBrightnessInNits=1000 and targetSdrWhitePointInNits=500 | ||
| const float HDR_SDR_RATIO = 2.0; | ||
|
|
||
| // Matrix values are calculated as inverse of RGB_BT2020_TO_XYZ. | ||
| const mat3 XYZ_TO_RGB_BT2020 = | ||
| mat3(1.71665, -0.666684, 0.0176399, -0.355671, 1.61648, -0.0427706, | ||
| -0.253366, 0.0157685, 0.942103); | ||
| // Matrix values are calculated as inverse of XYZ_TO_RGB_BT709. | ||
| const mat3 RGB_BT709_TO_XYZ = | ||
| mat3(0.412391, 0.212639, 0.0193308, 0.357584, 0.715169, 0.119195, 0.180481, | ||
| 0.0721923, 0.950532); | ||
|
|
||
| // Reference: | ||
| // https://developer.android.com/reference/android/graphics/Gainmap#applying-a-gainmap-manually | ||
| // Reference Implementation: | ||
| // https://cs.android.com/android/platform/superproject/main/+/main:frameworks/base/libs/hwui/effects/GainmapRenderer.cpp;l=117-146;drc=fadc20184ccb27fe15bb862e6e03fa6d05d41eac | ||
| highp vec3 applyGainmap(vec4 S, vec4 G, int uGainmapIsAlpha, int uNoGamma, | ||
| int uSingleChannel, vec4 uLogRatioMin, | ||
| vec4 uLogRatioMax, vec4 uEpsilonSdr, vec4 uEpsilonHdr, | ||
| vec4 uGainmapGamma, float uDisplayRatioHdr, | ||
| float uDisplayRatioSdr) { | ||
| float W = clamp((log(HDR_SDR_RATIO) - log(uDisplayRatioSdr)) / | ||
| (log(uDisplayRatioHdr) - log(uDisplayRatioSdr)), | ||
| 0.0, 1.0); | ||
| vec3 H; | ||
| if (uGainmapIsAlpha == 1) { | ||
| G = vec4(G.a, G.a, G.a, 1.0); | ||
| } | ||
| if (uSingleChannel == 1) { | ||
| mediump float L; | ||
| if (uNoGamma == 1) { | ||
| L = mix(uLogRatioMin.r, uLogRatioMax.r, G.r); | ||
| } else { | ||
| L = mix(uLogRatioMin.r, uLogRatioMax.r, pow(G.r, uGainmapGamma.r)); | ||
| } | ||
| H = (S.rgb + uEpsilonSdr.rgb) * exp(L * W) - uEpsilonHdr.rgb; | ||
| } else { | ||
| mediump vec3 L; | ||
| if (uNoGamma == 1) { | ||
| L = mix(uLogRatioMin.rgb, uLogRatioMax.rgb, G.rgb); | ||
| } else { | ||
| L = mix(uLogRatioMin.rgb, uLogRatioMax.rgb, | ||
| pow(G.rgb, uGainmapGamma.rgb)); | ||
| } | ||
| H = (S.rgb + uEpsilonSdr.rgb) * exp(L * W) - uEpsilonHdr.rgb; | ||
| } | ||
| return H; | ||
| } | ||
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||
| highp vec3 bt709ToBt2020(vec3 bt709Color) { | ||
| return XYZ_TO_RGB_BT2020 * RGB_BT709_TO_XYZ * bt709Color; | ||
| } | ||
|
|
||
| vec3 scaleHdrLuminance(vec3 linearColor) { | ||
| const float SDR_MAX_LUMINANCE = 500.0; | ||
| const float HDR_MAX_LUMINANCE = 1000.0; | ||
| return linearColor * SDR_MAX_LUMINANCE / HDR_MAX_LUMINANCE; | ||
| } | ||
|
|
||
| // sRGB EOTF for one channel. | ||
| float srgbEotfSingleChannel(float srgb) { | ||
| return srgb <= 0.04045 ? srgb / 12.92 : pow((srgb + 0.055) / 1.055, 2.4); | ||
| } | ||
|
|
||
| // sRGB EOTF. | ||
| vec4 srgbEotf(vec4 srgb) { | ||
| return vec4(srgbEotfSingleChannel(srgb.r), srgbEotfSingleChannel(srgb.g), | ||
| srgbEotfSingleChannel(srgb.b), srgb.a); | ||
| } |
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