libs/pivot.h

   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_PIVOT_H )
  23 #define INCLUDED_PIVOT_H
  24
  25 #include "math/matrix.h"
  26
  27
  28 inline void billboard_viewplaneOriented( Matrix4& rotation, const Matrix4& world2screen ){
  29 #if 1
  30         rotation = g_matrix4_identity;
  31         Vector3 x( vector3_normalised( vector4_to_vector3( world2screen.x() ) ) );
  32         Vector3 y( vector3_normalised( vector4_to_vector3( world2screen.y() ) ) );
  33         Vector3 z( vector3_normalised( vector4_to_vector3( world2screen.z() ) ) );
  34         vector4_to_vector3( rotation.y() ) = Vector3( x.y(), y.y(), z.y() );
  35         vector4_to_vector3( rotation.z() ) = vector3_negated( Vector3( x.z(), y.z(), z.z() ) );
  36         vector4_to_vector3( rotation.x() ) = vector3_normalised( vector3_cross( vector4_to_vector3( rotation.y() ), vector4_to_vector3( rotation.z() ) ) );
  37         vector4_to_vector3( rotation.y() ) = vector3_cross( vector4_to_vector3( rotation.z() ), vector4_to_vector3( rotation.x() ) );
  38 #else
  39         Matrix4 screen2world( matrix4_full_inverse( world2screen ) );
  40
  41         Vector3 near_(
  42                 vector4_projected(
  43                         matrix4_transformed_vector4(
  44                                 screen2world,
  45                                 Vector4( 0, 0, -1, 1 )
  46                                 )
  47                         )
  48                 );
  49
  50         Vector3 far_(
  51                 vector4_projected(
  52                         matrix4_transformed_vector4(
  53                                 screen2world,
  54                                 Vector4( 0, 0, 1, 1 )
  55                                 )
  56                         )
  57                 );
  58
  59         Vector3 up(
  60                 vector4_projected(
  61                         matrix4_transformed_vector4(
  62                                 screen2world,
  63                                 Vector4( 0, 1, -1, 1 )
  64                                 )
  65                         )
  66                 );
  67
  68         rotation = g_matrix4_identity;
  69         vector4_to_vector3( rotation.y() ) = vector3_normalised( vector3_subtracted( up, near_ ) );
  70         vector4_to_vector3( rotation.z() ) = vector3_normalised( vector3_subtracted( near_, far_ ) );
  71         vector4_to_vector3( rotation.x() ) = vector3_normalised( vector3_cross( vector4_to_vector3( rotation.y() ), vector4_to_vector3( rotation.z() ) ) );
  72         vector4_to_vector3( rotation.y() ) = vector3_cross( vector4_to_vector3( rotation.z() ), vector4_to_vector3( rotation.x() ) );
  73 #endif
  74 }
  75
  76 inline void billboard_viewpointOriented( Matrix4& rotation, const Matrix4& world2screen ){
  77         Matrix4 screen2world( matrix4_full_inverse( world2screen ) );
  78
  79 #if 1
  80         rotation = g_matrix4_identity;
  81         vector4_to_vector3( rotation.y() ) = vector3_normalised( vector4_to_vector3( screen2world.y() ) );
  82         vector4_to_vector3( rotation.z() ) = vector3_negated( vector3_normalised( vector4_to_vector3( screen2world.z() ) ) );
  83         vector4_to_vector3( rotation.x() ) = vector3_normalised( vector3_cross( vector4_to_vector3( rotation.y() ), vector4_to_vector3( rotation.z() ) ) );
  84         vector4_to_vector3( rotation.y() ) = vector3_cross( vector4_to_vector3( rotation.z() ), vector4_to_vector3( rotation.x() ) );
  85 #else
  86         Vector3 near_(
  87                 vector4_projected(
  88                         matrix4_transformed_vector4(
  89                                 screen2world,
  90                                 Vector4( world2screen[12] / world2screen[15], world2screen[13] / world2screen[15], -1, 1 )
  91                                 )
  92                         )
  93                 );
  94
  95         Vector3 far_(
  96                 vector4_projected(
  97                         matrix4_transformed_vector4(
  98                                 screen2world,
  99                                 Vector4( world2screen[12] / world2screen[15], world2screen[13] / world2screen[15], 1, 1 )
 100                                 )
 101                         )
 102                 );
 103
 104         Vector3 up(
 105                 vector4_projected(
 106                         matrix4_transformed_vector4(
 107                                 screen2world,
 108                                 Vector4( world2screen[12] / world2screen[15], world2screen[13] / world2screen[15] + 1, -1, 1 )
 109                                 )
 110                         )
 111                 );
 112
 113         rotation = g_matrix4_identity;
 114         vector4_to_vector3( rotation.y() ) = vector3_normalised( vector3_subtracted( up, near_ ) );
 115         vector4_to_vector3( rotation.z() ) = vector3_normalised( vector3_subtracted( near_, far_ ) );
 116         vector4_to_vector3( rotation.x() ) = vector3_normalised( vector3_cross( vector4_to_vector3( rotation.y() ), vector4_to_vector3( rotation.z() ) ) );
 117         vector4_to_vector3( rotation.y() ) = vector3_cross( vector4_to_vector3( rotation.z() ), vector4_to_vector3( rotation.x() ) );
 118 #endif
 119 }
 120
 121
 122 inline void ConstructObject2Screen( Matrix4& object2screen, const Matrix4& object2world, const Matrix4& world2view, const Matrix4& view2device, const Matrix4& device2screen ){
 123         object2screen = device2screen;
 124         matrix4_multiply_by_matrix4( object2screen, view2device );
 125         matrix4_multiply_by_matrix4( object2screen, world2view );
 126         matrix4_multiply_by_matrix4( object2screen, object2world );
 127 }
 128
 129 inline void ConstructObject2Device( Matrix4& object2screen, const Matrix4& object2world, const Matrix4& world2view, const Matrix4& view2device ){
 130         object2screen = view2device;
 131         matrix4_multiply_by_matrix4( object2screen, world2view );
 132         matrix4_multiply_by_matrix4( object2screen, object2world );
 133 }
 134
 135 inline void ConstructDevice2Object( Matrix4& device2object, const Matrix4& object2world, const Matrix4& world2view, const Matrix4& view2device ){
 136         ConstructObject2Device( device2object, object2world, world2view, view2device );
 137         matrix4_full_invert( device2object );
 138 }
 139
 140 //! S =  ( Inverse(Object2Screen *post ScaleOf(Object2Screen) ) *post Object2Screen
 141 inline void pivot_scale( Matrix4& scale, const Matrix4& pivot2screen ){
 142         Matrix4 pre_scale( g_matrix4_identity );
 143         pre_scale[0] = static_cast<float>( vector3_length( vector4_to_vector3( pivot2screen.x() ) ) );
 144         pre_scale[5] = static_cast<float>( vector3_length( vector4_to_vector3( pivot2screen.y() ) ) );
 145         pre_scale[10] = static_cast<float>( vector3_length( vector4_to_vector3( pivot2screen.z() ) ) );
 146
 147         scale = pivot2screen;
 148         matrix4_multiply_by_matrix4( scale, pre_scale );
 149         matrix4_full_invert( scale );
 150         matrix4_multiply_by_matrix4( scale, pivot2screen );
 151 }
 152
 153 // scale by (inverse) W
 154 inline void pivot_perspective( Matrix4& scale, const Matrix4& pivot2screen ){
 155         scale = g_matrix4_identity;
 156         scale[0] = scale[5] = scale[10] = pivot2screen[15];
 157 }
 158
 159 inline void ConstructDevice2Manip( Matrix4& device2manip, const Matrix4& object2world, const Matrix4& world2view, const Matrix4& view2device, const Matrix4& device2screen ){
 160         Matrix4 pivot2screen;
 161         ConstructObject2Screen( pivot2screen, object2world, world2view, view2device, device2screen );
 162
 163         ConstructObject2Device( device2manip, object2world, world2view, view2device );
 164
 165         Matrix4 scale;
 166         pivot_scale( scale, pivot2screen );
 167         matrix4_multiply_by_matrix4( device2manip, scale );
 168         pivot_perspective( scale, pivot2screen );
 169         matrix4_multiply_by_matrix4( device2manip, scale );
 170
 171         matrix4_full_invert( device2manip );
 172 }
 173
 174 inline void Pivot2World_worldSpace( Matrix4& manip2world, const Matrix4& pivot2world, const Matrix4& modelview, const Matrix4& projection, const Matrix4& viewport ){
 175         manip2world = pivot2world;
 176
 177         Matrix4 pivot2screen;
 178         ConstructObject2Screen( pivot2screen, pivot2world, modelview, projection, viewport );
 179
 180         Matrix4 scale;
 181         pivot_scale( scale, pivot2screen );
 182         matrix4_multiply_by_matrix4( manip2world, scale );
 183         pivot_perspective( scale, pivot2screen );
 184         matrix4_multiply_by_matrix4( manip2world, scale );
 185 }
 186
 187 inline void Pivot2World_viewpointSpace( Matrix4& manip2world, Vector3& axis, const Matrix4& pivot2world, const Matrix4& modelview, const Matrix4& projection, const Matrix4& viewport ){
 188         manip2world = pivot2world;
 189
 190         Matrix4 pivot2screen;
 191         ConstructObject2Screen( pivot2screen, pivot2world, modelview, projection, viewport );
 192
 193         Matrix4 scale;
 194         pivot_scale( scale, pivot2screen );
 195         matrix4_multiply_by_matrix4( manip2world, scale );
 196
 197         billboard_viewpointOriented( scale, pivot2screen );
 198         axis = vector4_to_vector3( scale.z() );
 199         matrix4_multiply_by_matrix4( manip2world, scale );
 200
 201         pivot_perspective( scale, pivot2screen );
 202         matrix4_multiply_by_matrix4( manip2world, scale );
 203 }
 204
 205 inline void Pivot2World_viewplaneSpace( Matrix4& manip2world, const Matrix4& pivot2world, const Matrix4& modelview, const Matrix4& projection, const Matrix4& viewport ){
 206         manip2world = pivot2world;
 207
 208         Matrix4 pivot2screen;
 209         ConstructObject2Screen( pivot2screen, pivot2world, modelview, projection, viewport );
 210
 211         Matrix4 scale;
 212         pivot_scale( scale, pivot2screen );
 213         matrix4_multiply_by_matrix4( manip2world, scale );
 214
 215         billboard_viewplaneOriented( scale, pivot2screen );
 216         matrix4_multiply_by_matrix4( manip2world, scale );
 217
 218         pivot_perspective( scale, pivot2screen );
 219         matrix4_multiply_by_matrix4( manip2world, scale );
 220 }
 221
 222
 223 #include "renderable.h"
 224 #include "cullable.h"
 225 #include "render.h"
 226
 227 const Colour4b g_colour_x( 255, 0, 0, 255 );
 228 const Colour4b g_colour_y( 0, 255, 0, 255 );
 229 const Colour4b g_colour_z( 0, 0, 255, 255 );
 230
 231 class Shader;
 232
 233 class RenderablePivot : public OpenGLRenderable
 234 {
 235 VertexBuffer<PointVertex> m_vertices;
 236 public:
 237 mutable Matrix4 m_localToWorld;
 238 typedef Static<Shader*> StaticShader;
 239 static Shader* getShader(){
 240         return StaticShader::instance();
 241 }
 242
 243 RenderablePivot(){
 244         m_vertices.reserve( 6 );
 245
 246         m_vertices.push_back( PointVertex( Vertex3f( 0, 0, 0 ), g_colour_x ) );
 247         m_vertices.push_back( PointVertex( Vertex3f( 16, 0, 0 ), g_colour_x ) );
 248
 249         m_vertices.push_back( PointVertex( Vertex3f( 0, 0, 0 ), g_colour_y ) );
 250         m_vertices.push_back( PointVertex( Vertex3f( 0, 16, 0 ), g_colour_y ) );
 251
 252         m_vertices.push_back( PointVertex( Vertex3f( 0, 0, 0 ), g_colour_z ) );
 253         m_vertices.push_back( PointVertex( Vertex3f( 0, 0, 16 ), g_colour_z ) );
 254 }
 255
 256 void render( RenderStateFlags state ) const {
 257         if ( m_vertices.size() == 0 ) {
 258                 return;
 259         }
 260         if ( m_vertices.data() == 0 ) {
 261                 return;
 262         }
 263         glVertexPointer( 3, GL_FLOAT, sizeof( PointVertex ), &m_vertices.data()->vertex );
 264         glColorPointer( 4, GL_UNSIGNED_BYTE, sizeof( PointVertex ), &m_vertices.data()->colour );
 265         glDrawArrays( GL_LINES, 0, m_vertices.size() );
 266 }
 267
 268 void render( Renderer& renderer, const VolumeTest& volume, const Matrix4& localToWorld ) const {
 269         renderer.PushState();
 270
 271         Pivot2World_worldSpace( m_localToWorld, localToWorld, volume.GetModelview(), volume.GetProjection(), volume.GetViewport() );
 272
 273         renderer.Highlight( Renderer::ePrimitive, false );
 274         renderer.SetState( getShader(), Renderer::eWireframeOnly );
 275         renderer.SetState( getShader(), Renderer::eFullMaterials );
 276         renderer.addRenderable( *this, m_localToWorld );
 277
 278         renderer.PopState();
 279 }
 280 };
 281
 282
 283
 284 #endif