view.h

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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"

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;

static inline void debug_count_dot ()
{
    ++g_count_dots;
}

static inline void debug_count_plane ()
{
    ++g_count_planes;
}

static inline void debug_count_oriented_plane ()
{
    ++g_count_oriented_planes;
}

static inline void debug_count_bbox ()
{
    ++g_count_bboxs;
}

static inline void debug_count_oriented_bbox ()
{
    ++g_count_oriented_bboxs;
}

class View : public VolumeTest {
    Matrix4 m_modelview;
    Matrix4 m_projection;
    Matrix4 m_viewport;

    Matrix4 m_scissor;

    Matrix4 m_viewproj;
    Vector4 m_viewer;
    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.getVector3();
    }
};

#endif