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/*
Copyright (C) 2001-2006, William Joseph.
All Rights Reserved.
This file is part of GtkRadiant.
GtkRadiant is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
GtkRadiant is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#if !defined(INCLUDED_VIEW_H)
#define INCLUDED_VIEW_H
#include "cullable.h"
#include "math/frustum.h"
#if defined(_DEBUG)
#define DEBUG_CULLING
#endif
#if defined(DEBUG_CULLING)
extern int g_count_dots;
extern int g_count_planes;
extern int g_count_oriented_planes;
extern int g_count_bboxs;
extern int g_count_oriented_bboxs;
#endif
inline void debug_count_dot()
{
#if defined(DEBUG_CULLING)
++g_count_dots;
#endif
}
inline void debug_count_plane()
{
#if defined(DEBUG_CULLING)
++g_count_planes;
#endif
}
inline void debug_count_oriented_plane()
{
#if defined(DEBUG_CULLING)
++g_count_oriented_planes;
#endif
}
inline void debug_count_bbox()
{
#if defined(DEBUG_CULLING)
++g_count_bboxs;
#endif
}
inline void debug_count_oriented_bbox()
{
#if defined(DEBUG_CULLING)
++g_count_oriented_bboxs;
#endif
}
/// \brief View-volume culling and transformations.
class View : public VolumeTest
{
/// modelview matrix
Matrix4 m_modelview;
/// projection matrix
Matrix4 m_projection;
/// device-to-screen transform
Matrix4 m_viewport;
Matrix4 m_scissor;
/// combined modelview and projection matrix
Matrix4 m_viewproj;
/// camera position in world space
Vector4 m_viewer;
/// view frustum in world space
Frustum m_frustum;
bool m_fill;
void construct()
{
m_viewproj = matrix4_multiplied_by_matrix4(matrix4_multiplied_by_matrix4(m_scissor, m_projection), m_modelview);
m_frustum = frustum_from_viewproj(m_viewproj);
m_viewer = viewer_from_viewproj(m_viewproj);
}
public:
View(bool fill = false) :
m_modelview(g_matrix4_identity),
m_projection(g_matrix4_identity),
m_scissor(g_matrix4_identity),
m_fill(fill)
{
}
void Construct(const Matrix4& projection, const Matrix4& modelview, std::size_t width, std::size_t height)
{
// modelview
m_modelview = modelview;
// projection
m_projection = projection;
// viewport
m_viewport = g_matrix4_identity;
m_viewport[0] = float(width/2);
m_viewport[5] = float(height/2);
if(fabs(m_projection[11]) > 0.0000001)
m_viewport[10] = m_projection[0] * m_viewport[0];
else
m_viewport[10] = 1 / m_projection[10];
construct();
}
void EnableScissor(float min_x, float max_x, float min_y, float max_y)
{
m_scissor = g_matrix4_identity;
m_scissor[0] = static_cast<float>((max_x - min_x) * 0.5);
m_scissor[5] = static_cast<float>((max_y - min_y) * 0.5);
m_scissor[12] = static_cast<float>((min_x + max_x) * 0.5);
m_scissor[13] = static_cast<float>((min_y + max_y) * 0.5);
matrix4_full_invert(m_scissor);
construct();
}
void DisableScissor()
{
m_scissor = g_matrix4_identity;
construct();
}
bool TestPoint(const Vector3& point) const
{
return viewproj_test_point(m_viewproj, point);
}
bool TestLine(const Segment& segment) const
{
return frustum_test_line(m_frustum, segment);
}
bool TestPlane(const Plane3& plane) const
{
debug_count_plane();
return viewer_test_plane(m_viewer, plane);
}
bool TestPlane(const Plane3& plane, const Matrix4& localToWorld) const
{
debug_count_oriented_plane();
return viewer_test_transformed_plane(m_viewer, plane, localToWorld);
}
VolumeIntersectionValue TestAABB(const AABB& aabb) const
{
debug_count_bbox();
return frustum_test_aabb(m_frustum, aabb);
}
VolumeIntersectionValue TestAABB(const AABB& aabb, const Matrix4& localToWorld) const
{
debug_count_oriented_bbox();
return frustum_intersects_transformed_aabb(m_frustum, aabb, localToWorld);
}
const Matrix4& GetViewMatrix() const
{
return m_viewproj;
}
const Matrix4& GetViewport() const
{
return m_viewport;
};
const Matrix4& GetModelview() const
{
return m_modelview;
}
const Matrix4& GetProjection() const
{
return m_projection;
}
bool fill() const
{
return m_fill;
}
const Vector3& getViewer() const
{
return m_viewer;
}
};
#endif
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