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/*
* Copyright (c) Contributors, http://opensimulator.org/
* See CONTRIBUTORS.TXT for a full list of copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the OpenSimulator Project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.Drawing;
using OpenMetaverse;
namespace OpenSim.Region.CoreModules.World.Warp3DMap
{
public class Viewport
{
private const float DEG_TO_RAD = (float)Math.PI / 180f;
private static readonly Vector3 UP_DIRECTION = Vector3.UnitZ;
public Vector3 Position;
public Vector3 LookDirection;
public float FieldOfView;
public float NearPlaneDistance;
public float FarPlaneDistance;
public int Width;
public int Height;
public bool Orthographic;
public float OrthoWindowWidth;
public float OrthoWindowHeight;
public Viewport(Vector3 position, Vector3 lookDirection, float fieldOfView, float farPlaneDist, float nearPlaneDist, int width, int height)
{
// Perspective projection mode
Position = position;
LookDirection = lookDirection;
FieldOfView = fieldOfView;
FarPlaneDistance = farPlaneDist;
NearPlaneDistance = nearPlaneDist;
Width = width;
Height = height;
}
public Viewport(Vector3 position, Vector3 lookDirection, float farPlaneDist, float nearPlaneDist, int width, int height, float orthoWindowWidth, float orthoWindowHeight)
{
// Orthographic projection mode
Position = position;
LookDirection = lookDirection;
FarPlaneDistance = farPlaneDist;
NearPlaneDistance = nearPlaneDist;
Width = width;
Height = height;
OrthoWindowWidth = orthoWindowWidth;
OrthoWindowHeight = orthoWindowHeight;
Orthographic = true;
}
public Point VectorToScreen(Vector3 v)
{
Matrix4 m = GetWorldToViewportMatrix();
Vector3 screenPoint = v * m;
return new Point((int)screenPoint.X, (int)screenPoint.Y);
}
public Matrix4 GetWorldToViewportMatrix()
{
Matrix4 result = GetViewMatrix();
result *= GetPerspectiveProjectionMatrix();
result *= GetViewportMatrix();
return result;
}
public Matrix4 GetViewMatrix()
{
Vector3 zAxis = -LookDirection;
zAxis.Normalize();
Vector3 xAxis = Vector3.Cross(UP_DIRECTION, zAxis);
xAxis.Normalize();
Vector3 yAxis = Vector3.Cross(zAxis, xAxis);
Vector3 position = Position;
float offsetX = -Vector3.Dot(xAxis, position);
float offsetY = -Vector3.Dot(yAxis, position);
float offsetZ = -Vector3.Dot(zAxis, position);
return new Matrix4(
xAxis.X, yAxis.X, zAxis.X, 0f,
xAxis.Y, yAxis.Y, zAxis.Y, 0f,
xAxis.Z, yAxis.Z, zAxis.Z, 0f,
offsetX, offsetY, offsetZ, 1f);
}
public Matrix4 GetPerspectiveProjectionMatrix()
{
float aspectRatio = (float)Width / (float)Height;
float hFoV = FieldOfView * DEG_TO_RAD;
float zn = NearPlaneDistance;
float zf = FarPlaneDistance;
float xScale = 1f / (float)Math.Tan(hFoV / 2f);
float yScale = aspectRatio * xScale;
float m33 = (zf == double.PositiveInfinity) ? -1 : (zf / (zn - zf));
float m43 = zn * m33;
return new Matrix4(
xScale, 0f, 0f, 0f,
0f, yScale, 0f, 0f,
0f, 0f, m33, -1f,
0f, 0f, m43, 0f);
}
public Matrix4 GetOrthographicProjectionMatrix(float aspectRatio)
{
float w = Width;
float h = Height;
float zn = NearPlaneDistance;
float zf = FarPlaneDistance;
float m33 = 1 / (zn - zf);
float m43 = zn * m33;
return new Matrix4(
2f / w, 0f, 0f, 0f,
0f, 2f / h, 0f, 0f,
0f, 0f, m33, 0f,
0f, 0f, m43, 1f);
}
public Matrix4 GetViewportMatrix()
{
float scaleX = (float)Width * 0.5f;
float scaleY = (float)Height * 0.5f;
float offsetX = 0f + scaleX;
float offsetY = 0f + scaleY;
return new Matrix4(
scaleX, 0f, 0f, 0f,
0f, -scaleY, 0f, 0f,
0f, 0f, 1f, 0f,
offsetX, offsetY, 0f, 1f);
}
}
}
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