obliqlib3D/src/ObMatrix4.m3


Copyright (C) 1994, Digital Equipment Corp.
       Created on Tue Jan 19 14:00:00 PST 1994 by najork                   

MODULE ObMatrix4;

IMPORT Matrix4, ObAux, ObCommand, ObLib, ObReal, ObValue, SynLocation;

REVEAL
  T = ObValue.ValAnything BRANDED OBJECT
    matrix : Matrix4.T;
  OVERRIDES
    Is := DoIs;
  END;

TYPE
  Code = {Id, Multiply, Translate, Scale, RotateX, RotateY, RotateZ};

  OpCode = ObLib.OpCode OBJECT
    code: Code;
  END;

  Package = ObLib.T OBJECT
  OVERRIDES
    Eval := DoEval;
  END;

CONST
  pkgname = "Matrix4";

PROCEDURE DoIs (self: T; other: ObValue.ValAnything): BOOLEAN =
  BEGIN
    TYPECASE other OF
      T (oth) => RETURN self.matrix = oth.matrix;
    ELSE
      RETURN FALSE
    END;
  END DoIs;

PROCEDURE M3ToObliq (READONLY val : Matrix4.T) : T =
  BEGIN
    RETURN NEW (T, what := "<a Matrix4.T>", matrix := val);
  END M3ToObliq;

PROCEDURE ObliqToM3 (val : T) : Matrix4.T =
  BEGIN
    RETURN val.matrix;
  END ObliqToM3;

PROCEDURE GetArg (args    : ObValue.ArgArray;
                  idx     : INTEGER;
                  package : ObLib.T;
                  opCode  : ObLib.OpCode;
                  loc     : SynLocation.T) : Matrix4.T RAISES {ObValue.Error} =
  BEGIN
    TYPECASE args[idx] OF
    | T (node) =>
      RETURN node.matrix;
    ELSE
      ObValue.BadArgType (idx, pkgname, package.name, opCode.name, loc);
      RETURN Matrix4.Id;     (* ... only to suppress compiler warning *)
    END;
  END GetArg;

PROCEDURE SetupPackage () =

  PROCEDURE NewOpCode (name: TEXT; arity: INTEGER; code: Code) : OpCode =
    BEGIN
      RETURN NEW (OpCode, name := name, arity := arity, code := code);
    END NewOpCode;

  TYPE
    OpCodes = ARRAY OF ObLib.OpCode;
  VAR
    opCodes: REF OpCodes;
  BEGIN
    opCodes := NEW (REF OpCodes, NUMBER (Code));
    opCodes^ :=
        OpCodes {
            NewOpCode ("Id",       -1, Code.Id),
            NewOpCode ("Multiply",  2, Code.Multiply),
            NewOpCode ("Translate", 4, Code.Translate),
            NewOpCode ("Scale",     4, Code.Scale),
            NewOpCode ("RotateX",   2, Code.RotateX),
            NewOpCode ("RotateY",   2, Code.RotateY),
            NewOpCode ("RotateZ",   2, Code.RotateZ)
        };

    ObLib.Register (NEW (Package, name := pkgname, opCodes := opCodes));
    ObLib.RegisterHelp (pkgname, Help);
  END SetupPackage;

PROCEDURE DoEval (self         : Package;
                  opCode       : ObLib.OpCode;
     <* UNUSED *> arity        : ObLib.OpArity;
                  READONLY args: ObValue.ArgArray;
     <* UNUSED *> temp         : BOOLEAN;
                  loc          : SynLocation.T) : ObValue.Val
    RAISES {ObValue.Error} =
  BEGIN
    CASE NARROW (opCode, OpCode).code OF
    | Code.Id =>
      RETURN M3ToObliq (Matrix4.Id);
    | Code.Multiply =>
      WITH m1 = GetArg (args, 1, self, opCode, loc),
           m2 = GetArg (args, 2, self, opCode, loc) DO
        RETURN M3ToObliq (Matrix4.Multiply (m1, m2));
      END;
    | Code.Translate =>
      WITH m = GetArg        (args, 1, self, opCode, loc),
           x = ObReal.GetArg (args, 2, self, opCode, loc),
           y = ObReal.GetArg (args, 3, self, opCode, loc),
           z = ObReal.GetArg (args, 4, self, opCode, loc) DO
        RETURN M3ToObliq (Matrix4.Translate (m, x, y, z));
      END;
    | Code.Scale =>
      WITH m = GetArg        (args, 1, self, opCode, loc),
           x = ObReal.GetArg (args, 2, self, opCode, loc),
           y = ObReal.GetArg (args, 3, self, opCode, loc),
           z = ObReal.GetArg (args, 4, self, opCode, loc) DO
        RETURN M3ToObliq (Matrix4.Scale (m, x, y, z));
      END;
    | Code.RotateX =>
      WITH m = GetArg        (args, 1, self, opCode, loc),
           a = ObReal.GetArg (args, 2, self, opCode, loc) DO
        RETURN M3ToObliq (Matrix4.RotateX (m, a));
      END;
    | Code.RotateY =>
      WITH m = GetArg        (args, 1, self, opCode, loc),
           a = ObReal.GetArg (args, 2, self, opCode, loc) DO
        RETURN M3ToObliq (Matrix4.RotateY (m, a));
      END;
    | Code.RotateZ =>
      WITH m = GetArg        (args, 1, self, opCode, loc),
           a = ObReal.GetArg (args, 2, self, opCode, loc) DO
        RETURN M3ToObliq (Matrix4.RotateZ (m, a));
      END;
    END;
  END DoEval;
*************************************************************************** Help ***************************************************************************

PROCEDURE Help (self : ObCommand.T; arg : TEXT; <* UNUSED *> data : REFANY) =
  BEGIN
    ObAux.Help (self, arg, pkgname);
  END Help;

BEGIN
END ObMatrix4.