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Nitload
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//-----------------------------------------------------------------------
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//-----------------------------------------------------------------------
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// file="Camera.cs"
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// Project: StgSharp
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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.GL;
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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 vec3d _target, up;
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public Camera()
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{
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cameraAtt = Matrix44.Unit;
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_target = Vec3d.Zero;
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up = Vec3d.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(vec3d position, vec3d target, vec3d up) : 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
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=> _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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{
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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 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 name="source">Shader program requires this camera.</param>
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/// <param name="uniformName">
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/// ContextName of all related uniforms.
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/// If you fallow form from <see cref="IglConvertable.DisplayGLtypeDefinition"/>
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/// </param>
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/// <exception cref="ArgumentException"></exception>
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public unsafe void GainAllUniforms(ShaderProgram source, params string[] uniformName)
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{
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if (uniformName.Length != 1)
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{
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throw new ArgumentException();
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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 * View);
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glFunc.SetUniformValue(convertedUniform, Projection * View);
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}
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public void SetViewDirection(vec3d position, vec3d target, vec3d up)
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{
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vec3d direction = position - target;
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if ((position.vec == cameraAtt.colum3.vec) && (this.up == up) && (cameraAtt.colum2.vec == direction.vec))
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{
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//no difference with precious value
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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 (Vec3d.IsParallel(direction, up))
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{
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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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vec3d right = Linear.Orthogonalize(Linear.Cross(up, direction));
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cameraAtt.colum0.vec = right.vec;
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cameraAtt.colum1.vec = up.vec;
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cameraAtt.colum2.vec = direction.vec;
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cameraAtt.colum3.vec = position.vec;
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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(Radius fovRadius, vec2d size, vec2d offset, (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 vec4d[] 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 (vec4d item in vec)
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{
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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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{
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}
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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(
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cameraAtt.colum1.vec,
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cameraAtt.colum2.vec
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);
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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),
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Scaler.Sin(angle), Scaler.Cos(angle)
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);
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partialCoord *= rotation;
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rotationAtt.colum1.vec = partialCoord.colum0.vec;
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rotationAtt.colum2.vec = partialCoord.colum1.vec;
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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(
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cameraAtt.colum0.vec,
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cameraAtt.colum1.vec
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);
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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),
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Scaler.Sin(angle), Scaler.Cos(angle)
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);
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partialCoord *= rotation;
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rotationAtt.colum0.vec = partialCoord.colum0.vec;
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rotationAtt.colum1.vec = partialCoord.colum1.vec;
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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(
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cameraAtt.colum0.vec,
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cameraAtt.colum2.vec
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);
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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),
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Scaler.Sin(angle), Scaler.Cos(angle)
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);
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partialCoord *= rotation;
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rotationAtt.colum0.vec = partialCoord.colum0.vec;
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rotationAtt.colum2.vec = partialCoord.colum1.vec;
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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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