Add updated Xiaomi Mi-Log CSCs with constants updated

xiaomi/CSC.Xiaomi.ACES_to_MiLog_BT2020.ctl

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+// <ACEStransformID>urn:ampas:aces:transformId:v2.0:CSC.Xiaomi.ACES_to_MiLog_BT2020.a2.v1</ACEStransformID>
+// <ACESuserName>ACES2065-1 to Mi-Log Rec2020</ACESuserName>
+
+import "Lib.Academy.Utilities";
+import "Lib.Academy.ColorSpaces";
+
+const Chromaticities AP0 = // ACES Primaries from SMPTE ST2065-1
+    {
+        {0.73470, 0.26530},
+        {0.00000, 1.00000},
+        {0.00010, -0.07700},
+        {0.32168, 0.33767}};
+
+const Chromaticities REC2020_PRI =
+    {
+        {0.70800, 0.29200},
+        {0.17000, 0.79700},
+        {0.13100, 0.04600},
+        {0.31270, 0.32900}};
+
+const float AP0_TO_REC2020_MAT[3][3] = calculate_rgb_to_rgb_matrix(AP0,
+                                                                   REC2020_PRI,
+                                                                   CONE_RESP_MAT_CAT02);
+
+float lin_to_MiLog(float x)
+{
+    const float R_0 = -0.09023729;
+    const float R_t = 0.01974185;
+    const float c = 18.10531998;
+    const float gamma = 0.09271529;
+    const float beta = 0.01384578;
+    const float delta = 0.67291850;
+
+    if (x >= R_t)
+    {
+        return gamma * log2(x + beta) + delta;
+    }
+    else if (x < R_t && x >= R_0)
+    {
+        return c * pow(x - R_0, 2.);
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+void main(
+    input varying float rIn,
+    input varying float gIn,
+    input varying float bIn,
+    input varying float aIn,
+    output varying float rOut,
+    output varying float gOut,
+    output varying float bOut,
+    output varying float aOut)
+{
+    float ACES[3] = {rIn, gIn, bIn};
+
+    float lin_rec2020[3] = mult_f3_f33(ACES, AP0_TO_REC2020_MAT);
+
+    rOut = lin_to_MiLog(lin_rec2020[0]);
+    gOut = lin_to_MiLog(lin_rec2020[1]);
+    bOut = lin_to_MiLog(lin_rec2020[2]);
+    aOut = aIn;
+}

xiaomi/CSC.Xiaomi.MiLog_BT2020_to_ACES.ctl

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+// <ACEStransformID>urn:ampas:aces:transformId:v2.0:CSC.Xiaomi.MiLog_BT2020_to_ACES.a2.v1</ACEStransformID>
+// <ACESuserName>Mi-Log Rec2020 to ACES2065-1</ACESuserName>
+
+import "Lib.Academy.Utilities";
+import "Lib.Academy.ColorSpaces";
+
+const Chromaticities AP0 = // ACES Primaries from SMPTE ST2065-1
+    {
+        {0.73470, 0.26530},
+        {0.00000, 1.00000},
+        {0.00010, -0.07700},
+        {0.32168, 0.33767}};
+
+const Chromaticities REC2020_PRI =
+    {
+        {0.70800, 0.29200},
+        {0.17000, 0.79700},
+        {0.13100, 0.04600},
+        {0.31270, 0.32900}};
+
+const float REC2020_TO_AP0_MAT[3][3] = calculate_rgb_to_rgb_matrix(REC2020_PRI,
+                                                                   AP0,
+                                                                   CONE_RESP_MAT_CAT02);
+
+float MiLog_to_lin(float x)
+{
+    const float R_0 = -0.09023729;
+    const float R_t = 0.01974185;
+    const float c = 18.10531998;
+    const float gamma = 0.09271529;
+    const float beta = 0.01384578;
+    const float delta = 0.67291850;
+    const float P_t = c * pow(R_t - R_0, 2.);
+
+    if (x >= P_t)
+    {
+        return pow(2.,(x - delta) / gamma) - beta;
+    }
+    else if (x < P_t && x >= 0.0)
+    {
+        return sqrt(x / c) + R_0;
+    }
+    else
+    {
+        return R_0;
+    }
+}
+
+void main(
+    input varying float rIn,
+    input varying float gIn,
+    input varying float bIn,
+    input varying float aIn,
+    output varying float rOut,
+    output varying float gOut,
+    output varying float bOut,
+    output varying float aOut)
+{
+    float lin_rec2020[3];
+    lin_rec2020[0] = MiLog_to_lin(rIn);
+    lin_rec2020[1] = MiLog_to_lin(gIn);
+    lin_rec2020[2] = MiLog_to_lin(bIn);
+
+    float ACES[3] = mult_f3_f33(lin_rec2020, REC2020_TO_AP0_MAT);
+
+    rOut = ACES[0];
+    gOut = ACES[1];
+    bOut = ACES[2];
+    aOut = aIn;
+}