vmap/libs/pivot.h

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2020-11-17 11:16:16 +00:00
/*
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_PIVOT_H )
#define INCLUDED_PIVOT_H
#include "math/matrix.h"
inline void billboard_viewplaneOriented( Matrix4& rotation, const Matrix4& world2screen ){
#if 1
rotation = g_matrix4_identity;
Vector3 x( vector3_normalised( vector4_to_vector3( world2screen.x() ) ) );
Vector3 y( vector3_normalised( vector4_to_vector3( world2screen.y() ) ) );
Vector3 z( vector3_normalised( vector4_to_vector3( world2screen.z() ) ) );
vector4_to_vector3( rotation.y() ) = Vector3( x.y(), y.y(), z.y() );
vector4_to_vector3( rotation.z() ) = vector3_negated( Vector3( x.z(), y.z(), z.z() ) );
vector4_to_vector3( rotation.x() ) = vector3_normalised( vector3_cross( vector4_to_vector3( rotation.y() ), vector4_to_vector3( rotation.z() ) ) );
vector4_to_vector3( rotation.y() ) = vector3_cross( vector4_to_vector3( rotation.z() ), vector4_to_vector3( rotation.x() ) );
#else
Matrix4 screen2world( matrix4_full_inverse( world2screen ) );
Vector3 near_(
vector4_projected(
matrix4_transformed_vector4(
screen2world,
Vector4( 0, 0, -1, 1 )
)
)
);
Vector3 far_(
vector4_projected(
matrix4_transformed_vector4(
screen2world,
Vector4( 0, 0, 1, 1 )
)
)
);
Vector3 up(
vector4_projected(
matrix4_transformed_vector4(
screen2world,
Vector4( 0, 1, -1, 1 )
)
)
);
rotation = g_matrix4_identity;
vector4_to_vector3( rotation.y() ) = vector3_normalised( vector3_subtracted( up, near_ ) );
vector4_to_vector3( rotation.z() ) = vector3_normalised( vector3_subtracted( near_, far_ ) );
vector4_to_vector3( rotation.x() ) = vector3_normalised( vector3_cross( vector4_to_vector3( rotation.y() ), vector4_to_vector3( rotation.z() ) ) );
vector4_to_vector3( rotation.y() ) = vector3_cross( vector4_to_vector3( rotation.z() ), vector4_to_vector3( rotation.x() ) );
#endif
}
inline void billboard_viewpointOriented( Matrix4& rotation, const Matrix4& world2screen ){
Matrix4 screen2world( matrix4_full_inverse( world2screen ) );
#if 1
rotation = g_matrix4_identity;
vector4_to_vector3( rotation.y() ) = vector3_normalised( vector4_to_vector3( screen2world.y() ) );
vector4_to_vector3( rotation.z() ) = vector3_negated( vector3_normalised( vector4_to_vector3( screen2world.z() ) ) );
vector4_to_vector3( rotation.x() ) = vector3_normalised( vector3_cross( vector4_to_vector3( rotation.y() ), vector4_to_vector3( rotation.z() ) ) );
vector4_to_vector3( rotation.y() ) = vector3_cross( vector4_to_vector3( rotation.z() ), vector4_to_vector3( rotation.x() ) );
#else
Vector3 near_(
vector4_projected(
matrix4_transformed_vector4(
screen2world,
Vector4( world2screen[12] / world2screen[15], world2screen[13] / world2screen[15], -1, 1 )
)
)
);
Vector3 far_(
vector4_projected(
matrix4_transformed_vector4(
screen2world,
Vector4( world2screen[12] / world2screen[15], world2screen[13] / world2screen[15], 1, 1 )
)
)
);
Vector3 up(
vector4_projected(
matrix4_transformed_vector4(
screen2world,
Vector4( world2screen[12] / world2screen[15], world2screen[13] / world2screen[15] + 1, -1, 1 )
)
)
);
rotation = g_matrix4_identity;
vector4_to_vector3( rotation.y() ) = vector3_normalised( vector3_subtracted( up, near_ ) );
vector4_to_vector3( rotation.z() ) = vector3_normalised( vector3_subtracted( near_, far_ ) );
vector4_to_vector3( rotation.x() ) = vector3_normalised( vector3_cross( vector4_to_vector3( rotation.y() ), vector4_to_vector3( rotation.z() ) ) );
vector4_to_vector3( rotation.y() ) = vector3_cross( vector4_to_vector3( rotation.z() ), vector4_to_vector3( rotation.x() ) );
#endif
}
inline void ConstructObject2Screen( Matrix4& object2screen, const Matrix4& object2world, const Matrix4& world2view, const Matrix4& view2device, const Matrix4& device2screen ){
object2screen = device2screen;
matrix4_multiply_by_matrix4( object2screen, view2device );
matrix4_multiply_by_matrix4( object2screen, world2view );
matrix4_multiply_by_matrix4( object2screen, object2world );
}
inline void ConstructObject2Device( Matrix4& object2screen, const Matrix4& object2world, const Matrix4& world2view, const Matrix4& view2device ){
object2screen = view2device;
matrix4_multiply_by_matrix4( object2screen, world2view );
matrix4_multiply_by_matrix4( object2screen, object2world );
}
inline void ConstructDevice2Object( Matrix4& device2object, const Matrix4& object2world, const Matrix4& world2view, const Matrix4& view2device ){
ConstructObject2Device( device2object, object2world, world2view, view2device );
matrix4_full_invert( device2object );
}
//! S = ( Inverse(Object2Screen *post ScaleOf(Object2Screen) ) *post Object2Screen
inline void pivot_scale( Matrix4& scale, const Matrix4& pivot2screen ){
Matrix4 pre_scale( g_matrix4_identity );
pre_scale[0] = static_cast<float>( vector3_length( vector4_to_vector3( pivot2screen.x() ) ) );
pre_scale[5] = static_cast<float>( vector3_length( vector4_to_vector3( pivot2screen.y() ) ) );
pre_scale[10] = static_cast<float>( vector3_length( vector4_to_vector3( pivot2screen.z() ) ) );
scale = pivot2screen;
matrix4_multiply_by_matrix4( scale, pre_scale );
matrix4_full_invert( scale );
matrix4_multiply_by_matrix4( scale, pivot2screen );
}
// scale by (inverse) W
inline void pivot_perspective( Matrix4& scale, const Matrix4& pivot2screen ){
scale = g_matrix4_identity;
scale[0] = scale[5] = scale[10] = pivot2screen[15];
}
inline void ConstructDevice2Manip( Matrix4& device2manip, const Matrix4& object2world, const Matrix4& world2view, const Matrix4& view2device, const Matrix4& device2screen ){
Matrix4 pivot2screen;
ConstructObject2Screen( pivot2screen, object2world, world2view, view2device, device2screen );
ConstructObject2Device( device2manip, object2world, world2view, view2device );
Matrix4 scale;
pivot_scale( scale, pivot2screen );
matrix4_multiply_by_matrix4( device2manip, scale );
pivot_perspective( scale, pivot2screen );
matrix4_multiply_by_matrix4( device2manip, scale );
matrix4_full_invert( device2manip );
}
inline void Pivot2World_worldSpace( Matrix4& manip2world, const Matrix4& pivot2world, const Matrix4& modelview, const Matrix4& projection, const Matrix4& viewport ){
manip2world = pivot2world;
Matrix4 pivot2screen;
ConstructObject2Screen( pivot2screen, pivot2world, modelview, projection, viewport );
Matrix4 scale;
pivot_scale( scale, pivot2screen );
matrix4_multiply_by_matrix4( manip2world, scale );
pivot_perspective( scale, pivot2screen );
matrix4_multiply_by_matrix4( manip2world, scale );
}
inline void Pivot2World_viewpointSpace( Matrix4& manip2world, Vector3& axis, const Matrix4& pivot2world, const Matrix4& modelview, const Matrix4& projection, const Matrix4& viewport ){
manip2world = pivot2world;
Matrix4 pivot2screen;
ConstructObject2Screen( pivot2screen, pivot2world, modelview, projection, viewport );
Matrix4 scale;
pivot_scale( scale, pivot2screen );
matrix4_multiply_by_matrix4( manip2world, scale );
billboard_viewpointOriented( scale, pivot2screen );
axis = vector4_to_vector3( scale.z() );
matrix4_multiply_by_matrix4( manip2world, scale );
pivot_perspective( scale, pivot2screen );
matrix4_multiply_by_matrix4( manip2world, scale );
}
inline void Pivot2World_viewplaneSpace( Matrix4& manip2world, const Matrix4& pivot2world, const Matrix4& modelview, const Matrix4& projection, const Matrix4& viewport ){
manip2world = pivot2world;
Matrix4 pivot2screen;
ConstructObject2Screen( pivot2screen, pivot2world, modelview, projection, viewport );
Matrix4 scale;
pivot_scale( scale, pivot2screen );
matrix4_multiply_by_matrix4( manip2world, scale );
billboard_viewplaneOriented( scale, pivot2screen );
matrix4_multiply_by_matrix4( manip2world, scale );
pivot_perspective( scale, pivot2screen );
matrix4_multiply_by_matrix4( manip2world, scale );
}
#include "renderable.h"
#include "cullable.h"
#include "render.h"
const Colour4b g_colour_x( 255, 0, 0, 255 );
const Colour4b g_colour_y( 0, 255, 0, 255 );
const Colour4b g_colour_z( 0, 0, 255, 255 );
class Shader;
class RenderablePivot : public OpenGLRenderable
{
VertexBuffer<PointVertex> m_vertices;
public:
mutable Matrix4 m_localToWorld;
typedef Static<Shader*> StaticShader;
static Shader* getShader(){
return StaticShader::instance();
}
RenderablePivot(){
m_vertices.reserve( 6 );
m_vertices.push_back( PointVertex( Vertex3f( 0, 0, 0 ), g_colour_x ) );
m_vertices.push_back( PointVertex( Vertex3f( 16, 0, 0 ), g_colour_x ) );
m_vertices.push_back( PointVertex( Vertex3f( 0, 0, 0 ), g_colour_y ) );
m_vertices.push_back( PointVertex( Vertex3f( 0, 16, 0 ), g_colour_y ) );
m_vertices.push_back( PointVertex( Vertex3f( 0, 0, 0 ), g_colour_z ) );
m_vertices.push_back( PointVertex( Vertex3f( 0, 0, 16 ), g_colour_z ) );
}
void render( RenderStateFlags state ) const {
if ( m_vertices.size() == 0 ) {
return;
}
if ( m_vertices.data() == 0 ) {
return;
}
glVertexPointer( 3, GL_FLOAT, sizeof( PointVertex ), &m_vertices.data()->vertex );
glColorPointer( 4, GL_UNSIGNED_BYTE, sizeof( PointVertex ), &m_vertices.data()->colour );
glDrawArrays( GL_LINES, 0, m_vertices.size() );
}
void render( Renderer& renderer, const VolumeTest& volume, const Matrix4& localToWorld ) const {
renderer.PushState();
Pivot2World_worldSpace( m_localToWorld, localToWorld, volume.GetModelview(), volume.GetProjection(), volume.GetViewport() );
renderer.Highlight( Renderer::ePrimitive, false );
renderer.SetState( getShader(), Renderer::eWireframeOnly );
renderer.SetState( getShader(), Renderer::eFullMaterials );
renderer.addRenderable( *this, m_localToWorld );
renderer.PopState();
}
};
#endif