//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
//     file="Matrix34.cs"
//     Project: StgSharp
//     AuthorGroup: Nitload Space
//     Copyright (c) Nitload Space. All rights reserved.
//     
//     Permission is hereby granted, free of charge, to any person 
//     obtaining a copy of this software and associated documentation 
//     files (the “Software”), to deal in the Software without restriction, 
//     including without limitation the rights to use, copy, modify, merge,
//     publish, distribute, sublicense, and/or sell copies of the Software, 
//     and to permit persons to whom the Software is furnished to do so, 
//     subject to the following conditions:
//     
//     The above copyright notice and 
//     this permission notice shall be included in all copies 
//     or substantial portions of the Software.
//     
//     THE SOFTWARE IS PROVIDED “AS IS”, 
//     WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
//     INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
//     FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
//     IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
//     DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
//     ARISING FROM, OUT OF OR IN CONNECTION WITH 
//     THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//     
//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
using StgSharp.Internal.Intrinsic;

using System;
using System.Drawing;
using System.Numerics;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

namespace StgSharp.Math
{
    [StructLayout(
            LayoutKind.Explicit,
            Size = ( 7 * 4 * sizeof( float ) ) + sizeof( bool ),
            Pack = 16 )]
    public struct Matrix34 : IMatrix<Matrix34>
    {

        [FieldOffset( 7 * 4 * sizeof( float ) )] internal bool isTransposed;
        [FieldOffset( 4 * 4 * sizeof( float ) )] internal ColumnSet3 transpose;

        [FieldOffset( 0 )] internal ColumnSet4 mat;

        [FieldOffset( 0 * 4 * sizeof( float ) )] public Vec3 Colum0;
        [FieldOffset( 1 * 4 * sizeof( float ) )] public Vec3 Colum1;
        [FieldOffset( 2 * 4 * sizeof( float ) )] public Vec3 Colum2;
        [FieldOffset( 3 * 4 * sizeof( float ) )] public Vec3 Colum3;

        internal Matrix34( ColumnSet4 mat )
        {
            Unsafe.SkipInit( out this );
            isTransposed = false;
            this.mat = mat;
        }

        internal Matrix34( Vector4 c0, Vector4 c1, Vector4 c2, Vector4 c3 )
        {
            Unsafe.SkipInit( out this );
            isTransposed = false;
            mat.colum0 = c0;
            mat.colum1 = c1;
            mat.colum2 = c2;
            mat.colum3 = c3;
        }

        public Matrix34()
        {
            Unsafe.SkipInit( out this );
            isTransposed = false;
        }

        public Matrix34(
                       float a00,
                       float a01,
                       float a02,
                       float a03,
                       float a10,
                       float a11,
                       float a12,
                       float a13,
                       float a20,
                       float a21,
                       float a22,
                       float a23 )
        {
            Unsafe.SkipInit( out this );
            isTransposed = false;
            mat.colum0 = new Vector4( a00, a10, a20, 0 );
            mat.colum0 = new Vector4( a01, a11, a21, 0 );
            mat.colum0 = new Vector4( a02, a12, a22, 0 );
            mat.colum0 = new Vector4( a03, a13, a23, 0 );
        }

        public unsafe float this[ int rowNum, int columNum ]
        {
            get
            {
                if( ( rowNum > 2 ) || ( rowNum < 0 ) ) {
                    throw new ArgumentOutOfRangeException( nameof( columNum ) );
                }
                if( ( columNum > 3 ) || ( columNum < 0 ) ) {
                    throw new ArgumentOutOfRangeException( nameof( columNum ) );
                }
                InternalTranspose();
                fixed( float* p = &this.transpose.m00 ) {
                    ulong pbit = ( ( ulong )p ) + ( ( ( ulong )sizeof( Vector4 ) ) * ( ( ulong )rowNum ) ) + ( ( ( ulong )sizeof( float ) ) * ( ( ulong )columNum ) );
                    return *( float* )pbit;
                }
            }
            set
            {
                if( ( rowNum > 2 ) || ( rowNum < 0 ) ) {
                    throw new ArgumentOutOfRangeException( nameof( columNum ) );
                }
                if( ( columNum > 3 ) || ( columNum < 0 ) ) {
                    throw new ArgumentOutOfRangeException( nameof( columNum ) );
                }
                InternalTranspose();
                fixed( float* p = &this.transpose.m00 ) {
                    ulong pbit = ( ( ulong )p ) + ( ( ( ulong )sizeof( Vector4 ) ) * ( ( ulong )rowNum ) ) + ( ( ( ulong )sizeof( float ) ) * ( ( ulong )columNum ) );
                    *( float* )pbit = value;
                }
                isTransposed = false;
            }
        }

        internal unsafe void InternalTranspose()
        {
            if( !isTransposed ) {
                fixed( ColumnSet4* source = &this.mat ) {
                    fixed( ColumnSet3* target = &this.transpose ) {
                        InternalIO.Intrinsic.transpose43( source, target );
                    }
                }

                isTransposed = true;
            }
        }

        [MethodImpl( MethodImplOptions.AggressiveInlining )]
        public static unsafe Matrix34 operator -(
                                                       Matrix34 left,
                                                       Matrix34 right )
        {
            Matrix34 ret = new Matrix34();
            InternalIO.Intrinsic.sub_mat_4( &left.mat, &right.mat, &ret.mat );
            return ret;
        }

        [MethodImpl( MethodImplOptions.AggressiveInlining )]
        public static Matrix34 operator *( Matrix34 mat, float value )
        {
            return new Matrix34(
                mat.mat.colum0 * value, mat.mat.colum1 * value,
                mat.mat.colum2 * value, mat.mat.colum3 * value );
        }

        [MethodImpl( MethodImplOptions.AggressiveInlining )]
        public static Matrix32 operator *( Matrix34 left, Matrix42 right )
        {
            left.InternalTranspose();
            return new Matrix32(
                Vector4.Dot( left.transpose.colum0, right.mat.colum0 ),
                Vector4.Dot( left.transpose.colum0, right.mat.colum1 ),

                Vector4.Dot( left.transpose.colum1, right.mat.colum0 ),
                Vector4.Dot( left.transpose.colum1, right.mat.colum1 ),

                Vector4.Dot( left.transpose.colum2, right.mat.colum0 ),
                Vector4.Dot( left.transpose.colum2, right.mat.colum1 ) );
        }

        [MethodImpl( MethodImplOptions.AggressiveInlining )]
        public static Matrix33 operator *( Matrix34 left, Matrix43 right )
        {
            left.InternalTranspose();
            return new Matrix33(
                Vector4.Dot( left.transpose.colum0, right.mat.colum0 ),
                Vector4.Dot( left.transpose.colum0, right.mat.colum1 ),
                Vector4.Dot( left.transpose.colum0, right.mat.colum2 ),

                Vector4.Dot( left.transpose.colum1, right.mat.colum0 ),
                Vector4.Dot( left.transpose.colum1, right.mat.colum1 ),
                Vector4.Dot( left.transpose.colum1, right.mat.colum2 ),

                Vector4.Dot( left.transpose.colum2, right.mat.colum0 ),
                Vector4.Dot( left.transpose.colum2, right.mat.colum1 ),
                Vector4.Dot( left.transpose.colum2, right.mat.colum2 ) );
        }

        [MethodImpl( MethodImplOptions.AggressiveInlining )]
        public static Matrix34 operator *( Matrix34 left, Matrix44 right )
        {
            left.InternalTranspose();
            return new Matrix34(
                Vector4.Dot( left.transpose.colum0, right.mat.colum0 ),
                Vector4.Dot( left.transpose.colum0, right.mat.colum1 ),
                Vector4.Dot( left.transpose.colum0, right.mat.colum2 ),
                Vector4.Dot( left.transpose.colum0, right.mat.colum3 ),

                Vector4.Dot( left.transpose.colum1, right.mat.colum0 ),
                Vector4.Dot( left.transpose.colum1, right.mat.colum1 ),
                Vector4.Dot( left.transpose.colum1, right.mat.colum2 ),
                Vector4.Dot( left.transpose.colum1, right.mat.colum3 ),

                Vector4.Dot( left.transpose.colum2, right.mat.colum0 ),
                Vector4.Dot( left.transpose.colum2, right.mat.colum1 ),
                Vector4.Dot( left.transpose.colum2, right.mat.colum2 ),
                Vector4.Dot( left.transpose.colum2, right.mat.colum3 ) );
        }

        [MethodImpl( MethodImplOptions.AggressiveInlining )]
        public static Matrix34 operator /( Matrix34 mat, float value )
        {
            return new Matrix34(
                mat.mat.colum0 / value, mat.mat.colum1 / value,
                mat.mat.colum2 / value, mat.mat.colum3 / value );
        }

        [MethodImpl( MethodImplOptions.AggressiveInlining )]
        public static unsafe Matrix34 operator +(
                                                       Matrix34 left,
                                                       Matrix34 right )
        {
            Matrix34 ret = new Matrix34();
            InternalIO.Intrinsic.add_mat_4( &left.mat, &right.mat, &ret.mat );
            return ret;
        }

    }
}