Add CSCs for Apple Log 2

apple/CSC.Apple.ACES_to_AppleLog_AppleWG.ctl

@@ -0,0 +1,74 @@
+
+// SPDX-License-Identifier: Apache-2.0
+// Copyright Contributors to the ACES Project.
+
+// <ACEStransformID>urn:ampas:aces:transformId:v2.0:CSC.Apple.ACES_to_AppleLog_AppleWG.a2.v1</ACEStransformID>
+// <ACESuserName>ACES2065-1 to Apple Log 2</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 APPLE_WG_PRI =
+    {
+        {0.725,  0.301},
+        {0.221,  0.814},
+        {0.068, -0.076},
+        {0.3127, 0.329}};
+
+// Apple Wide Gamut -to- ACES conversion matrix
+const float ACES_to_APPLE_WG_MAT[3][3] = calculate_rgb_to_rgb_matrix(AP0,
+                                                                     APPLE_WG_PRI);
+
+float linear_to_AppleLog(float R)
+{
+    const float R_0 = -0.05641088;
+    const float R_t = 0.01;
+    const float c = 47.28711236;
+    const float b = 0.00964052;
+    const float g = 0.08550479;
+    const float d = 0.69336945;
+
+    if (R >= R_t)
+    {
+        return g * log2(R + b) + d;
+    }
+    else if (R < R_t && R >= R_0)
+    {
+        return c * pow(R - R_0, 2.);
+    }
+    else
+    {
+        return 0.0;
+    }
+}
+
+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_Apple_WG[3] = mult_f3_f33(aces, ACES_to_APPLE_WG_MAT);
+
+    float AppleLog2[3];
+    AppleLog2[0] = linear_to_AppleLog(lin_Apple_WG[0]);
+    AppleLog2[1] = linear_to_AppleLog(lin_Apple_WG[1]);
+    AppleLog2[2] = linear_to_AppleLog(lin_Apple_WG[2]);
+
+    rOut = AppleLog2[0];
+    gOut = AppleLog2[1];
+    bOut = AppleLog2[2];
+    aOut = aIn;
+}

apple/CSC.Apple.AppleLog_AppleWG_to_ACES.ctl

@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright Contributors to the ACES Project.
+
+// <ACEStransformID>urn:ampas:aces:transformId:v2.0:CSC.Apple.AppleLog_AppleWG_to_ACES.a2.v1</ACEStransformID>
+// <ACESuserName>Apple Log 2 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 APPLE_WG_PRI =
+    {
+        {0.725,  0.301},
+        {0.221,  0.814},
+        {0.068, -0.076},
+        {0.3127, 0.329}};
+
+// Apple Wide Gamut -to- ACES conversion matrix
+const float APPLE_WG_to_ACES_MAT[3][3] = calculate_rgb_to_rgb_matrix(APPLE_WG_PRI,
+                                                                     AP0);
+
+float AppleLog_to_linear(float x)
+{
+    const float R_0 = -0.05641088;
+    const float R_t = 0.01;
+    const float c = 47.28711236;
+    const float b = 0.00964052;
+    const float g = 0.08550479;
+    const float d = 0.69336945;
+    const float P_t = c * pow((R_t - R_0), 2.0);
+
+    if (x >= P_t)
+    {
+        return pow(2.0, (x - d) / g) - b;
+    }
+    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_Apple_WG[3];
+    lin_Apple_WG[0] = AppleLog_to_linear(rIn);
+    lin_Apple_WG[1] = AppleLog_to_linear(gIn);
+    lin_Apple_WG[2] = AppleLog_to_linear(bIn);
+
+    float ACES[3] = mult_f3_f33(lin_Apple_WG, APPLE_WG_to_ACES_MAT);
+
+    rOut = ACES[0];
+    gOut = ACES[1];
+    bOut = ACES[2];
+    aOut = aIn;
+}

apple/README.md

@@ -1,4 +1,5 @@
 ## Apple Log
 
-The Apple Log profile white paper and LUTs can be found at https://developer.apple.com/download/all/?q=Apple%20log%20profile
+White paper and LUTs for original Apple Log can be found at https://developer.apple.com/download/all/?q=Apple%20log%20profile
+White paper and LUTs for Apple Log 2 can be found at https://developer.apple.com/download/all/?q=apple%20log%202