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Diffstat (limited to '')
-rw-r--r-- | OpenSim/Region/CoreModules/World/Warp3DMap/Viewport.cs | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/OpenSim/Region/CoreModules/World/Warp3DMap/Viewport.cs b/OpenSim/Region/CoreModules/World/Warp3DMap/Viewport.cs new file mode 100644 index 0000000..472f86e --- /dev/null +++ b/OpenSim/Region/CoreModules/World/Warp3DMap/Viewport.cs | |||
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1 | /* | ||
2 | * Copyright (c) Contributors, http://opensimulator.org/ | ||
3 | * See CONTRIBUTORS.TXT for a full list of copyright holders. | ||
4 | * | ||
5 | * Redistribution and use in source and binary forms, with or without | ||
6 | * modification, are permitted provided that the following conditions are met: | ||
7 | * * Redistributions of source code must retain the above copyright | ||
8 | * notice, this list of conditions and the following disclaimer. | ||
9 | * * Redistributions in binary form must reproduce the above copyright | ||
10 | * notice, this list of conditions and the following disclaimer in the | ||
11 | * documentation and/or other materials provided with the distribution. | ||
12 | * * Neither the name of the OpenSimulator Project nor the | ||
13 | * names of its contributors may be used to endorse or promote products | ||
14 | * derived from this software without specific prior written permission. | ||
15 | * | ||
16 | * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY | ||
17 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | ||
18 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | ||
19 | * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY | ||
20 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | ||
21 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | ||
22 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | ||
23 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | ||
25 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
26 | */ | ||
27 | |||
28 | using System; | ||
29 | using System.Drawing; | ||
30 | using OpenMetaverse; | ||
31 | |||
32 | namespace OpenSim.Region.CoreModules.World.Warp3DMap | ||
33 | { | ||
34 | public class Viewport | ||
35 | { | ||
36 | private const float DEG_TO_RAD = (float)Math.PI / 180f; | ||
37 | private static readonly Vector3 UP_DIRECTION = Vector3.UnitZ; | ||
38 | |||
39 | public Vector3 Position; | ||
40 | public Vector3 LookDirection; | ||
41 | public float FieldOfView; | ||
42 | public float NearPlaneDistance; | ||
43 | public float FarPlaneDistance; | ||
44 | public int Width; | ||
45 | public int Height; | ||
46 | public bool Orthographic; | ||
47 | public float OrthoWindowWidth; | ||
48 | public float OrthoWindowHeight; | ||
49 | |||
50 | public Viewport(Vector3 position, Vector3 lookDirection, float fieldOfView, float farPlaneDist, float nearPlaneDist, int width, int height) | ||
51 | { | ||
52 | // Perspective projection mode | ||
53 | Position = position; | ||
54 | LookDirection = lookDirection; | ||
55 | FieldOfView = fieldOfView; | ||
56 | FarPlaneDistance = farPlaneDist; | ||
57 | NearPlaneDistance = nearPlaneDist; | ||
58 | Width = width; | ||
59 | Height = height; | ||
60 | } | ||
61 | |||
62 | public Viewport(Vector3 position, Vector3 lookDirection, float farPlaneDist, float nearPlaneDist, int width, int height, float orthoWindowWidth, float orthoWindowHeight) | ||
63 | { | ||
64 | // Orthographic projection mode | ||
65 | Position = position; | ||
66 | LookDirection = lookDirection; | ||
67 | FarPlaneDistance = farPlaneDist; | ||
68 | NearPlaneDistance = nearPlaneDist; | ||
69 | Width = width; | ||
70 | Height = height; | ||
71 | OrthoWindowWidth = orthoWindowWidth; | ||
72 | OrthoWindowHeight = orthoWindowHeight; | ||
73 | Orthographic = true; | ||
74 | } | ||
75 | |||
76 | public Point VectorToScreen(Vector3 v) | ||
77 | { | ||
78 | Matrix4 m = GetWorldToViewportMatrix(); | ||
79 | Vector3 screenPoint = v * m; | ||
80 | return new Point((int)screenPoint.X, (int)screenPoint.Y); | ||
81 | } | ||
82 | |||
83 | public Matrix4 GetWorldToViewportMatrix() | ||
84 | { | ||
85 | Matrix4 result = GetViewMatrix(); | ||
86 | result *= GetPerspectiveProjectionMatrix(); | ||
87 | result *= GetViewportMatrix(); | ||
88 | |||
89 | return result; | ||
90 | } | ||
91 | |||
92 | public Matrix4 GetViewMatrix() | ||
93 | { | ||
94 | Vector3 zAxis = -LookDirection; | ||
95 | zAxis.Normalize(); | ||
96 | |||
97 | Vector3 xAxis = Vector3.Cross(UP_DIRECTION, zAxis); | ||
98 | xAxis.Normalize(); | ||
99 | |||
100 | Vector3 yAxis = Vector3.Cross(zAxis, xAxis); | ||
101 | |||
102 | Vector3 position = Position; | ||
103 | float offsetX = -Vector3.Dot(xAxis, position); | ||
104 | float offsetY = -Vector3.Dot(yAxis, position); | ||
105 | float offsetZ = -Vector3.Dot(zAxis, position); | ||
106 | |||
107 | return new Matrix4( | ||
108 | xAxis.X, yAxis.X, zAxis.X, 0f, | ||
109 | xAxis.Y, yAxis.Y, zAxis.Y, 0f, | ||
110 | xAxis.Z, yAxis.Z, zAxis.Z, 0f, | ||
111 | offsetX, offsetY, offsetZ, 1f); | ||
112 | } | ||
113 | |||
114 | public Matrix4 GetPerspectiveProjectionMatrix() | ||
115 | { | ||
116 | float aspectRatio = (float)Width / (float)Height; | ||
117 | |||
118 | float hFoV = FieldOfView * DEG_TO_RAD; | ||
119 | float zn = NearPlaneDistance; | ||
120 | float zf = FarPlaneDistance; | ||
121 | |||
122 | float xScale = 1f / (float)Math.Tan(hFoV / 2f); | ||
123 | float yScale = aspectRatio * xScale; | ||
124 | float m33 = (zf == double.PositiveInfinity) ? -1 : (zf / (zn - zf)); | ||
125 | float m43 = zn * m33; | ||
126 | |||
127 | return new Matrix4( | ||
128 | xScale, 0f, 0f, 0f, | ||
129 | 0f, yScale, 0f, 0f, | ||
130 | 0f, 0f, m33, -1f, | ||
131 | 0f, 0f, m43, 0f); | ||
132 | } | ||
133 | |||
134 | public Matrix4 GetOrthographicProjectionMatrix(float aspectRatio) | ||
135 | { | ||
136 | float w = Width; | ||
137 | float h = Height; | ||
138 | float zn = NearPlaneDistance; | ||
139 | float zf = FarPlaneDistance; | ||
140 | |||
141 | float m33 = 1 / (zn - zf); | ||
142 | float m43 = zn * m33; | ||
143 | |||
144 | return new Matrix4( | ||
145 | 2f / w, 0f, 0f, 0f, | ||
146 | 0f, 2f / h, 0f, 0f, | ||
147 | 0f, 0f, m33, 0f, | ||
148 | 0f, 0f, m43, 1f); | ||
149 | } | ||
150 | |||
151 | public Matrix4 GetViewportMatrix() | ||
152 | { | ||
153 | float scaleX = (float)Width * 0.5f; | ||
154 | float scaleY = (float)Height * 0.5f; | ||
155 | float offsetX = 0f + scaleX; | ||
156 | float offsetY = 0f + scaleY; | ||
157 | |||
158 | return new Matrix4( | ||
159 | scaleX, 0f, 0f, 0f, | ||
160 | 0f, -scaleY, 0f, 0f, | ||
161 | 0f, 0f, 1f, 0f, | ||
162 | offsetX, offsetY, 0f, 1f); | ||
163 | } | ||
164 | } | ||
165 | } | ||