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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_TRANSFORMLIB_H)
#define INCLUDED_TRANSFORMLIB_H
#include "generic/constant.h"
#include "math/matrix.h"
#include "math/quaternion.h"
/// \brief A transform node.
class TransformNode
{
public:
STRING_CONSTANT(Name, "TransformNode");
/// \brief Returns the transform which maps the node's local-space into the local-space of its parent node.
virtual const Matrix4& localToParent() const = 0;
};
/// \brief A transform node which has no effect.
class IdentityTransform : public TransformNode
{
public:
/// \brief Returns the identity matrix.
const Matrix4& localToParent() const
{
return g_matrix4_identity;
}
};
/// \brief A transform node which stores a generic transformation matrix.
class MatrixTransform : public TransformNode
{
Matrix4 m_localToParent;
public:
MatrixTransform() : m_localToParent(g_matrix4_identity)
{
}
Matrix4& localToParent()
{
return m_localToParent;
}
/// \brief Returns the stored local->parent transform.
const Matrix4& localToParent() const
{
return m_localToParent;
}
};
#include "generic/callback.h"
typedef Vector3 Translation;
typedef Quaternion Rotation;
typedef Vector3 Scale;
inline Matrix4 matrix4_transform_for_components(const Translation& translation, const Rotation& rotation, const Scale& scale)
{
Matrix4 result(matrix4_rotation_for_quaternion_quantised(rotation));
vector4_to_vector3(result.x()) *= scale.x();
vector4_to_vector3(result.y()) *= scale.y();
vector4_to_vector3(result.z()) *= scale.z();
result.tx() = translation.x();
result.ty() = translation.y();
result.tz() = translation.z();
return result;
}
typedef bool TransformModifierType;
const TransformModifierType TRANSFORM_PRIMITIVE = false;
const TransformModifierType TRANSFORM_COMPONENT = true;
/// \brief A transformable scene-graph instance.
///
/// A transformable instance may be translated, rotated or scaled.
/// The state of the instanced node's geometrical representation
/// will be the product of its geometry and the transforms of each
/// of its instances, applied in the order they appear in a graph
/// traversal.
/// Freezing the transform on an instance will cause its transform
/// to be permanently applied to the geometry of the node.
class Transformable
{
public:
STRING_CONSTANT(Name, "Transformable");
virtual void setType(TransformModifierType type) = 0;
virtual void setTranslation(const Translation& value) = 0;
virtual void setRotation(const Rotation& value) = 0;
virtual void setScale(const Scale& value) = 0;
virtual void freezeTransform() = 0;
};
const Translation c_translation_identity = Translation(0, 0, 0);
const Rotation c_rotation_identity = c_quaternion_identity;
const Scale c_scale_identity = Scale(1, 1, 1);
class TransformModifier : public Transformable
{
Translation m_translation;
Rotation m_rotation;
Scale m_scale;
Callback m_changed;
Callback m_apply;
TransformModifierType m_type;
public:
TransformModifier(const Callback& changed, const Callback& apply) :
m_translation(c_translation_identity),
m_rotation(c_quaternion_identity),
m_scale(c_scale_identity),
m_changed(changed),
m_apply(apply),
m_type(TRANSFORM_PRIMITIVE)
{
}
void setType(TransformModifierType type)
{
m_type = type;
}
TransformModifierType getType() const
{
return m_type;
}
void setTranslation(const Translation& value)
{
m_translation = value;
m_changed();
}
void setRotation(const Rotation& value)
{
m_rotation = value;
m_changed();
}
void setScale(const Scale& value)
{
m_scale = value;
m_changed();
}
void freezeTransform()
{
if(m_translation != c_translation_identity
|| m_rotation != c_rotation_identity
|| m_scale != c_scale_identity)
{
m_apply();
m_translation = c_translation_identity;
m_rotation = c_rotation_identity;
m_scale = c_scale_identity;
m_changed();
}
}
const Translation& getTranslation() const
{
return m_translation;
}
const Rotation& getRotation() const
{
return m_rotation;
}
const Scale& getScale() const
{
return m_scale;
}
Matrix4 calculateTransform() const
{
return matrix4_transform_for_components(getTranslation(), getRotation(), getScale());
}
};
#endif