314 lines
10 KiB
C#
314 lines
10 KiB
C#
//-----------------------------------------------------------------------
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//-----------------------------------------------------------------------
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// file="Camera.cs"
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// Project: StepVisualizer
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// AuthorGroup: Nitload Space
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// Copyright (c) Nitload Space. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the “Software”), to deal in the Software without restriction,
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// including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software,
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// and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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//
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// The above copyright notice and
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// this permission notice shall be included in all copies
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// or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED “AS IS”,
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// WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH
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// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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//-----------------------------------------------------------------------
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//-----------------------------------------------------------------------
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using StgSharp.Graphics;
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using StgSharp.Graphics.OpenGL;
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using StgSharp.Graphics.ShaderEdit;
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using StgSharp.Math;
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using System;
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using System.Collections.Generic;
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using System.Numerics;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using System.Text;
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namespace StgSharp.Graphics
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{
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public sealed class Camera : IglConvertable
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{
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private bool _isLookAtAvailable;
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internal Matrix44 _lookAt;
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internal Matrix44 _projection;
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internal Matrix44 cameraAtt;
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internal Matrix44 rotation;
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internal Matrix44 rotationAtt;
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internal Radius _pitch;
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internal Radius _row;
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internal Radius _yaw;
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internal Uniform<Matrix44> convertedUniform;
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internal Vec3 _target, up;
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public Camera()
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{
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cameraAtt = Matrix44.Unit;
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_target = Vec3.Zero;
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up = Vec3.Zero;
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_isLookAtAvailable = false;
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_lookAt = Matrix44.Unit;
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rotationAtt = Matrix44.Unit;
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_projection = new Matrix44();
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}
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public Camera( Vec3 position, Vec3 target, Vec3 up )
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: this()
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{
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rotationAtt = Matrix44.Unit;
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cameraAtt = new Matrix44();
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SetViewDirection( position, target, up );
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_pitch = Radius.Zero;
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_row = Radius.Zero;
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_yaw = Radius.Zero;
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}
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public Matrix44 Projection => _projection;
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public Matrix44 View
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{
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get
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{
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if( _isLookAtAvailable ) {
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return _lookAt;
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}
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Matrix44 move = Matrix44.Unit;
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move.colum3.vec -= cameraAtt.colum3.vec;
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_lookAt = rotationAtt.Transpose * move;
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_isLookAtAvailable = true;
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return _lookAt;
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}
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}
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public Matrix44 CameraMatrix()
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{
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return Projection * View;
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}
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public void DisplayGLtypeDefinition()
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{
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Console.WriteLine( "uniform matrix4x4 cameraName;" );
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}
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/// <summary>
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/// Get all uniform related to this <see cref="Camera" />.
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/// </summary>
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/// <param _label="source">
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/// Shader program requires this camera.
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/// </param>
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/// <param _label="uniformName">
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/// ContextName of all related uniforms. If you fallow form from <see
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/// cref="IglConvertable.DisplayGLtypeDefinition" />
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/// </param>
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/// <exception cref="ArgumentException">
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///
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/// </exception>
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public unsafe void GainAllUniforms( ShaderProgram source, params string[] uniformName )
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{
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if( uniformName is null || uniformName.Length != 1 ) {
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throw new ArgumentException(
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"Camera needs exactly one uniform.", nameof( uniformName ) );
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}
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convertedUniform = source.GetUniform<Matrix44>( uniformName[ 0 ] );
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}
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public void MoveNear( float distance )
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{
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cameraAtt.colum3.Z -= distance;
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_isLookAtAvailable = false;
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}
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public void MoveRight( float distance )
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{
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cameraAtt.colum3.X -= distance;
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_isLookAtAvailable = false;
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}
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public void MoveUp( float distance )
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{
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cameraAtt.colum3.Y -= distance;
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_isLookAtAvailable = false;
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}
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public unsafe void SetAllUniforms()
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{
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//Console.WriteLine(Projection * ViewBase);
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OpenGL.OpenGLFunction.CurrentGL.SetUniformValue( convertedUniform, Projection * View );
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}
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public void SetViewDirection( Vec3 position, Vec3 target, Vec3 up )
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{
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Vec3 direction = position - target;
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if( ( position.reg == cameraAtt.colum3.reg ) &&
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( this.up == up ) &&
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( cameraAtt.colum2.reg == direction.reg ) ) {
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return;
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}
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if( direction.GetLength() == 0 )
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{
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//deadlock
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throw new ArgumentException();
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}
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if( Vec3.IsParallel( direction, up ) ) {
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throw new ArgumentException();
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}
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_target = direction;
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this.up = up;
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_isLookAtAvailable = false;
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Linear.Orthogonalize( ref direction, ref up );
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Vec3 right = Linear.Orthogonalize( Linear.Cross( up, direction ) );
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cameraAtt.colum0.reg = right.reg;
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cameraAtt.colum1.reg = up.reg;
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cameraAtt.colum2.reg = direction.reg;
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cameraAtt.colum3.reg = position.reg;
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InternalPitch();
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InternalRow();
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InternalYaw();
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}
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public void SetViewRange(
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Radius fovRadius,
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Vec2 size,
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Vec2 offset,
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(float front, float back) dephRange )
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{
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float
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distance = _target.GetLength(),
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near = distance - dephRange.front,
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far = distance + dephRange.back,
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offsetX = offset.X,
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offsetY = offset.Y,
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width = Scaler.Abs( GeometryScaler.Tan( fovRadius / 2 ) * near * 2 ),
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height = ( width * size.Y ) / size.X;
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_projection.colum0.X = ( 2 * near ) / width;
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_projection.colum1.Y = ( 2 * near ) / height;
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_projection.colum2.X = ( 2 * offsetX ) / width;
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_projection.colum2.Y = ( 2 * offsetY ) / height;
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_projection.colum2.Z = ( far + near ) / ( near - far );
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_projection.colum2.W = -1;
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_projection.colum3.Z = ( 2 * near * far ) / ( near - far );
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}
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public void Test( params Vec4[] vec )
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{
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Console.WriteLine( View );
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Console.WriteLine( Projection );
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Console.WriteLine( Projection * View );
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Console.WriteLine( View );
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foreach( Vec4 item in vec ) {
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Console.Write( $"{Projection * View * item};" );
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}
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}
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ShaderStruct IglConvertable.GetConvertedGLtype()
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{
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throw new NotImplementedException();
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}
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~Camera() { }
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#region rotation
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public void Yaw( Radius r )
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{
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_yaw -= r;
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//Console.WriteLine(_yaw._radius);
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//Console.WriteLine(rotationAtt);
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InternalYaw();
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}
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public void Pitch( Radius r )
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{
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_pitch -= r;
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//Console.WriteLine(_pitch._radius);
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//Console.WriteLine(rotationAtt);
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InternalPitch();
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}
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public void Row( Radius r )
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{
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_row -= r;
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//Console.WriteLine(_row._radius);
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//Console.WriteLine(rotationAtt);
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InternalRow();
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}
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internal void InternalPitch()
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{
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_isLookAtAvailable = false;
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Matrix32 partialCoord = new Matrix32( cameraAtt.colum1.vec, cameraAtt.colum2.vec );
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float angle = _pitch._radius;
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Matrix22 rotation = new Matrix22(
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Scaler.Cos( angle ), -Scaler.Sin( angle ), Scaler.Sin( angle ),
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Scaler.Cos( angle ) );
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partialCoord *= rotation;
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rotationAtt.colum1.reg = partialCoord.colum0.reg;
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rotationAtt.colum2.reg = partialCoord.colum1.reg;
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rotationAtt.isTransposed = false;
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}
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internal void InternalRow()
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{
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_isLookAtAvailable = false;
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Matrix32 partialCoord = new Matrix32( cameraAtt.colum0.vec, cameraAtt.colum1.vec );
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float angle = _row._radius;
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Matrix22 rotation = new Matrix22(
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Scaler.Cos( angle ), -Scaler.Sin( angle ), Scaler.Sin( angle ),
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Scaler.Cos( angle ) );
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partialCoord *= rotation;
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rotationAtt.colum0.reg = partialCoord.colum0.reg;
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rotationAtt.colum1.reg = partialCoord.colum1.reg;
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rotationAtt.isTransposed = false;
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}
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internal void InternalYaw()
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{
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_isLookAtAvailable = false;
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Matrix32 partialCoord = new Matrix32( cameraAtt.colum0.vec, cameraAtt.colum2.vec );
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float angle = _yaw._radius;
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Matrix22 rotation = new Matrix22(
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Scaler.Cos( angle ), -Scaler.Sin( angle ), Scaler.Sin( angle ),
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Scaler.Cos( angle ) );
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partialCoord *= rotation;
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rotationAtt.colum0.reg = partialCoord.colum0.reg;
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rotationAtt.colum2.reg = partialCoord.colum1.reg;
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rotationAtt.isTransposed = false;
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}
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#endregion
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}
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}
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