public static void AbsoluteWorldToWorld(SpaceTransform xform, string inputValue, string outputVariable, ShaderStringBuilder sb)
{
// prior to version 2, always used position transform
if (xform.version <= 1)
{
xform.type = ConversionType.Position;
}
switch (xform.type)
{
case ConversionType.Position:
sb.AddLine(outputVariable, " = GetCameraRelativePositionWS(", inputValue, ");");
break;
case ConversionType.Direction:
case ConversionType.Normal:
// both normal and direction are unchanged
if (xform.normalize)
{
sb.AddLine(outputVariable, " = SafeNormalize(", inputValue, ");");
}
else
{
sb.AddLine(outputVariable, " = ", inputValue, ";");
}
break;
}
}
public static void TangentToWorld(SpaceTransform xform, string inputValue, string outputVariable, ShaderStringBuilder sb)
{
// prior to version 2 all transforms were Normal, and directional transforms were normalized
if (xform.version <= 1)
{
if (xform.type != ConversionType.Position)
{
xform.normalize = true;
}
xform.type = ConversionType.Normal;
}
using (sb.BlockScope())
{
string tangentTransform = GenerateTangentTransform(sb, CoordinateSpace.World);
switch (xform.type)
{
case ConversionType.Position:
sb.AddLine(outputVariable, " = TransformTangentToWorldDir(", inputValue, ", ", tangentTransform, ", false).xyz + IN.WorldSpacePosition;");
break;
case ConversionType.Direction:
sb.AddLine(outputVariable, " = TransformTangentToWorldDir(", inputValue, ", ", tangentTransform, ", ", xform.NormalizeString(), ").xyz;");
break;
case ConversionType.Normal:
sb.AddLine(outputVariable, " = TransformTangentToWorld(", inputValue, ", ", tangentTransform, ", ", xform.NormalizeString(), ");");
break;
}
}
}
public static void WorldToTangent(SpaceTransform xform, string inputValue, string outputVariable, ShaderStringBuilder sb)
{
if (xform.version <= 1)
{
// prior to version 2, all transform were normalized, and all transforms were Normal transforms
xform.normalize = true;
xform.type = ConversionType.Normal;
}
using (sb.BlockScope())
{
string tangentTransform = GenerateTangentTransform(sb, xform.from);
switch (xform.type)
{
case ConversionType.Position:
sb.AddLine(outputVariable, " = TransformWorldToTangentDir(", inputValue, " - IN.WorldSpacePosition, ", tangentTransform, ", false);");
break;
case ConversionType.Direction:
sb.AddLine(outputVariable, " = TransformWorldToTangentDir(", inputValue, ", ", tangentTransform, ", ", xform.NormalizeString(), ");");
break;
case ConversionType.Normal:
sb.AddLine(outputVariable, " = TransformWorldToTangent(", inputValue, ", ", tangentTransform, ", ", xform.NormalizeString(), ");");
break;
}
}
}
public static void Identity(SpaceTransform xform, string inputValue, string outputVariable, ShaderStringBuilder sb)
{
// identity didn't normalize before version 2
if ((xform.version > 1) && xform.normalize && (xform.type != ConversionType.Position))
{
sb.AddLine(outputVariable, " = SafeNormalize(", inputValue, ");");
}
else
{
sb.AddLine(outputVariable, " = ", inputValue, ";");
}
}
internal static IEnumerable <NeededTransform> ComputeTransformRequirement(SpaceTransform xform)
{
var func = k_TransformFunctions[(int)xform.from, (int)xform.to];
if (func == ViaWorld || func == ObjectToAbsoluteWorld)
{
yield return(new NeededTransform(xform.from.ToNeededCoordinateSpace(), NeededCoordinateSpace.World));
yield return(new NeededTransform(NeededCoordinateSpace.World, xform.to.ToNeededCoordinateSpace()));
}
else
{
yield return(new NeededTransform(xform.from.ToNeededCoordinateSpace(), xform.to.ToNeededCoordinateSpace()));
}
}
public static void ViewToWorld(SpaceTransform xform, string inputValue, string outputVariable, ShaderStringBuilder sb)
{
switch (xform.type)
{
case ConversionType.Position:
sb.AddLine(outputVariable, " = TransformViewToWorld(", inputValue, ");");
break;
case ConversionType.Direction:
if (xform.version <= 1)
{
xform.normalize = false;
}
sb.AddLine(outputVariable, " = TransformViewToWorldDir(", inputValue, ", ", xform.NormalizeString(), ");");
break;
case ConversionType.Normal:
sb.AddLine(outputVariable, " = TransformViewToWorldNormal(", inputValue, ", ", xform.NormalizeString(), ");");
break;
}
}
private static void ViaWorld(SpaceTransform xform, string inputValue, string outputVariable, ShaderStringBuilder sb)
{
// should never be calling this if one of the spaces is already world space (silly, and could lead to infinite recursions)
if ((xform.from == CoordinateSpace.World) || (xform.to == CoordinateSpace.World))
{
return;
}
// this breaks the transform into two parts: (from->world) and (world->to)
var toWorld = new SpaceTransform()
{
from = xform.from,
to = CoordinateSpace.World,
type = xform.type,
normalize = false,
version = xform.version
};
var fromWorld = new SpaceTransform()
{
from = CoordinateSpace.World,
to = xform.to,
type = xform.type,
normalize = xform.normalize,
version = xform.version
};
// Apply Versioning Hacks to match old (incorrect) versions
if (xform.version <= 1)
{
if (xform.type == ConversionType.Direction)
{
switch (xform.from)
{
case CoordinateSpace.AbsoluteWorld:
if ((xform.to == CoordinateSpace.Object) || (xform.to == CoordinateSpace.View))
{
// these transforms were wrong in v0, but correct in v1, so here we
// pretend it is a later version to disable the v1 versioning in the AbsWorldToWorld transform
if (xform.version == 1)
{
toWorld.version = 2;
}
}
break;
case CoordinateSpace.View:
if ((xform.to == CoordinateSpace.Tangent) || (xform.to == CoordinateSpace.AbsoluteWorld))
{
// these transforms erroneously used the position view-to-world transform
toWorld.type = ConversionType.Position;
}
break;
case CoordinateSpace.Tangent:
if ((xform.to == CoordinateSpace.Object) || (xform.to == CoordinateSpace.View) || (xform.to == CoordinateSpace.AbsoluteWorld))
{
// manually version to 2, to remove normalization (while keeping Normal type)
toWorld.type = ConversionType.Normal;
toWorld.version = 2;
}
break;
}
}
}
using (sb.BlockScope())
{
sb.AddLine("// Converting ", xform.type.ToString(), " from ", xform.from.ToString(), " to ", xform.to.ToString(), " via world space");
sb.AddLine("float3 world;");
GenerateTransformCodeStatement(toWorld, inputValue, "world", sb);
GenerateTransformCodeStatement(fromWorld, "world", outputVariable, sb);
}
}
public static void GenerateTransformCodeStatement(SpaceTransform xform, string inputValue, string outputVariable, ShaderStringBuilder sb)
{
var func = k_TransformFunctions[(int)xform.from, (int)xform.to];
func(xform, inputValue, outputVariable, sb);
}
