1 /*
2 Copyright (C) 2001-2006, William Joseph.
3 All Rights Reserved.
4
5 This file is part of GtkRadiant.
6
7 GtkRadiant is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 GtkRadiant is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GtkRadiant; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #if !defined(INCLUDED_VIEW_H)
23 #define INCLUDED_VIEW_H
24
25 #include "cullable.h"
26 #include "math/frustum.h"
27
28
29 #if defined(_DEBUG)
30 #define DEBUG_CULLING
31 #endif
32
33
34 #if defined(DEBUG_CULLING)
35
36 extern int g_count_dots;
37 extern int g_count_planes;
38 extern int g_count_oriented_planes;
39 extern int g_count_bboxs;
40 extern int g_count_oriented_bboxs;
41
42 #endif
43
debug_count_dot()44 inline void debug_count_dot()
45 {
46 #if defined(DEBUG_CULLING)
47 ++g_count_dots;
48 #endif
49 }
50
debug_count_plane()51 inline void debug_count_plane()
52 {
53 #if defined(DEBUG_CULLING)
54 ++g_count_planes;
55 #endif
56 }
57
debug_count_oriented_plane()58 inline void debug_count_oriented_plane()
59 {
60 #if defined(DEBUG_CULLING)
61 ++g_count_oriented_planes;
62 #endif
63 }
64
debug_count_bbox()65 inline void debug_count_bbox()
66 {
67 #if defined(DEBUG_CULLING)
68 ++g_count_bboxs;
69 #endif
70 }
71
debug_count_oriented_bbox()72 inline void debug_count_oriented_bbox()
73 {
74 #if defined(DEBUG_CULLING)
75 ++g_count_oriented_bboxs;
76 #endif
77 }
78
79
80
81
82 /// \brief View-volume culling and transformations.
83 class View : public VolumeTest
84 {
85 /// modelview matrix
86 Matrix4 m_modelview;
87 /// projection matrix
88 Matrix4 m_projection;
89 /// device-to-screen transform
90 Matrix4 m_viewport;
91
92 Matrix4 m_scissor;
93
94 /// combined modelview and projection matrix
95 Matrix4 m_viewproj;
96 /// camera position in world space
97 Vector4 m_viewer;
98 /// view frustum in world space
99 Frustum m_frustum;
100
101 bool m_fill;
102
construct()103 void construct()
104 {
105 m_viewproj = matrix4_multiplied_by_matrix4(matrix4_multiplied_by_matrix4(m_scissor, m_projection), m_modelview);
106
107 m_frustum = frustum_from_viewproj(m_viewproj);
108 m_viewer = viewer_from_viewproj(m_viewproj);
109 }
110 public:
111 View(bool fill = false) :
m_modelview(g_matrix4_identity)112 m_modelview(g_matrix4_identity),
113 m_projection(g_matrix4_identity),
114 m_scissor(g_matrix4_identity),
115 m_fill(fill)
116 {
117 }
Construct(const Matrix4 & projection,const Matrix4 & modelview,std::size_t width,std::size_t height)118 void Construct(const Matrix4& projection, const Matrix4& modelview, std::size_t width, std::size_t height)
119 {
120 // modelview
121 m_modelview = modelview;
122
123 // projection
124 m_projection = projection;
125
126 // viewport
127 m_viewport = g_matrix4_identity;
128 m_viewport[0] = float(width/2);
129 m_viewport[5] = float(height/2);
130 if(fabs(m_projection[11]) > 0.0000001)
131 m_viewport[10] = m_projection[0] * m_viewport[0];
132 else
133 m_viewport[10] = 1 / m_projection[10];
134
135 construct();
136 }
EnableScissor(float min_x,float max_x,float min_y,float max_y)137 void EnableScissor(float min_x, float max_x, float min_y, float max_y)
138 {
139 m_scissor = g_matrix4_identity;
140 m_scissor[0] = static_cast<float>((max_x - min_x) * 0.5);
141 m_scissor[5] = static_cast<float>((max_y - min_y) * 0.5);
142 m_scissor[12] = static_cast<float>((min_x + max_x) * 0.5);
143 m_scissor[13] = static_cast<float>((min_y + max_y) * 0.5);
144 matrix4_full_invert(m_scissor);
145
146 construct();
147 }
DisableScissor()148 void DisableScissor()
149 {
150 m_scissor = g_matrix4_identity;
151
152 construct();
153 }
154
TestPoint(const Vector3 & point)155 bool TestPoint(const Vector3& point) const
156 {
157 return viewproj_test_point(m_viewproj, point);
158 }
TestLine(const Segment & segment)159 bool TestLine(const Segment& segment) const
160 {
161 return frustum_test_line(m_frustum, segment);
162 }
TestPlane(const Plane3 & plane)163 bool TestPlane(const Plane3& plane) const
164 {
165 debug_count_plane();
166 return viewer_test_plane(m_viewer, plane);
167 }
TestPlane(const Plane3 & plane,const Matrix4 & localToWorld)168 bool TestPlane(const Plane3& plane, const Matrix4& localToWorld) const
169 {
170 debug_count_oriented_plane();
171 return viewer_test_transformed_plane(m_viewer, plane, localToWorld);
172 }
TestAABB(const AABB & aabb)173 VolumeIntersectionValue TestAABB(const AABB& aabb) const
174 {
175 debug_count_bbox();
176 return frustum_test_aabb(m_frustum, aabb);
177 }
TestAABB(const AABB & aabb,const Matrix4 & localToWorld)178 VolumeIntersectionValue TestAABB(const AABB& aabb, const Matrix4& localToWorld) const
179 {
180 debug_count_oriented_bbox();
181 return frustum_intersects_transformed_aabb(m_frustum, aabb, localToWorld);
182 }
183
GetViewMatrix()184 const Matrix4& GetViewMatrix() const
185 {
186 return m_viewproj;
187 }
GetViewport()188 const Matrix4& GetViewport() const
189 {
190 return m_viewport;
191 };
GetModelview()192 const Matrix4& GetModelview() const
193 {
194 return m_modelview;
195 }
GetProjection()196 const Matrix4& GetProjection() const
197 {
198 return m_projection;
199 }
200
fill()201 bool fill() const
202 {
203 return m_fill;
204 }
getViewer()205 const Vector3& getViewer() const
206 {
207 return m_viewer;
208 }
209 };
210
211 #endif
212