Tweak allocation vars for XYZ space for more accurate GPU transform

Also extend 3DLUT edge size to 64 (1 meg of memory) to increase
transform accuracy as well.

intern/opencolorio/ocio_impl_glsl.cc

@@ -51,8 +51,7 @@ using namespace OCIO_NAMESPACE;
 
 #include "ocio_impl.h"
 
-static const int LUT3D_EDGE_SIZE = 32;
-
+static const int LUT3D_EDGE_SIZE = 64;
 
 /* **** OpenGL drawing routines using GLSL for color space transform ***** */
 
@@ -97,7 +96,7 @@ static const char *g_fragShaderText = ""
 "        col[0] *= inv_alpha;\n"
 "        col[1] *= inv_alpha;\n"
 "        col[2] *= inv_alpha;\n"
-"}\n"
+"    }\n"
 "    gl_FragColor = OCIODisplay(col, tex2);\n"
 "\n"
 "}\n";

release/datafiles/colormanagement/config.ocio

@@ -171,11 +171,11 @@ colorspaces:
     equalitygroup:
     bitdepth: 32f
     isdata: false
-    allocation: uniform
-    allocationvars: [0, 1]
+    allocation: lg2
+    allocationvars: [-8.5, 5]
     from_reference: !<GroupTransform>
       children:
-        - !<FileTransform> {src: rec709_to_aces.spimtx, interpolation: nearest}
+        - !<FileTransform> {src: rec709_to_aces.spimtx, interpolation: linear}
         - !<FileTransform> {src: aces_to_xyz.spimtx, interpolation: linear}
 
   - !<ColorSpace>