source/render/camera.cpp

   1 #include <cmath>
   2 #include "camera.h"
   3 #include "matrix.h"
   4
   5 using namespace std;
   6
   7 namespace Msp {
   8 namespace GL {
   9
  10 Camera::Camera()
  11 {
  12         update_projection_matrix();
  13         update_object_matrix();
  14 }
  15
  16 void Camera::copy_parameters(const Camera &source)
  17 {
  18         fov = source.fov;
  19         height = source.height;
  20         aspect = source.aspect;
  21         clip_near = source.clip_near;
  22         clip_far = source.clip_far;
  23         frustum_x = source.frustum_x;
  24         frustum_y = source.frustum_y;
  25         rotate = source.rotate;
  26         position = source.position;
  27         look_dir = source.look_dir;
  28         up_dir = source.up_dir;
  29         update_projection_matrix();
  30         update_object_matrix();
  31 }
  32
  33 void Camera::set_field_of_view(const Geometry::Angle<float> &f)
  34 {
  35         fov = f;
  36         update_projection_matrix();
  37 }
  38
  39 void Camera::set_orthographic(float w, float h)
  40 {
  41         fov = Geometry::Angle<float>::zero();
  42         height = h;
  43         if(w)
  44                 aspect = w/h;
  45         update_projection_matrix();
  46 }
  47
  48 void Camera::set_aspect_ratio(float a)
  49 {
  50         aspect = a;
  51         update_projection_matrix();
  52 }
  53
  54 void Camera::set_depth_clip(float n, float f)
  55 {
  56         clip_near = n;
  57         clip_far = f;
  58         update_projection_matrix();
  59 }
  60
  61 void Camera::set_frustum_axis(float x, float y)
  62 {
  63         frustum_x = x;
  64         frustum_y = y;
  65         update_projection_matrix();
  66 }
  67
  68 void Camera::set_frustum_rotation(const Geometry::Angle<float> &r)
  69 {
  70         rotate = r;
  71         update_projection_matrix();
  72 }
  73
  74 void Camera::set_position(const Vector3 &p)
  75 {
  76         position = p;
  77         update_object_matrix();
  78 }
  79
  80 void Camera::set_look_direction(const Vector3 &l)
  81 {
  82         look_dir = normalize(l);
  83         update_object_matrix();
  84 }
  85
  86 void Camera::look_at(const Vector3 &p)
  87 {
  88         set_look_direction(p-position);
  89 }
  90
  91 void Camera::set_up_direction(const Vector3 &u)
  92 {
  93         up_dir = normalize(u);
  94         update_object_matrix();
  95 }
  96
  97 void Camera::set_object_matrix(const Matrix &m)
  98 {
  99         position = m.column(3).slice<3>(0);
 100         look_dir = normalize(-m.column(2).slice<3>(0));
 101         up_dir = normalize(m.column(1).slice<3>(0));
 102         update_object_matrix();
 103 }
 104
 105 Vector3 Camera::project(const Vector4 &p) const
 106 {
 107         Vector4 r = proj_matrix*(view_matrix*p);
 108         return r.slice<3>(0)/r.w;
 109 }
 110
 111 Vector3 Camera::project(const Vector3 &p) const
 112 {
 113         return project(Vector4(p.x, p.y, p.z, 1.0));
 114 }
 115
 116 Vector4 Camera::unproject(const Vector4 &p) const
 117 {
 118         Vector4 r = invert(proj_matrix)*Vector4(p.x, p.y, p.z, 1.0f);
 119         r = matrix*Vector4(r.x/r.w, r.y/r.w, r.z/r.w, p.w);
 120         return r;
 121 }
 122
 123 Vector3 Camera::unproject(const Vector3 &p) const
 124 {
 125         return unproject(Vector4(p.x, p.y, p.z, 1.0f)).slice<3>(0);
 126 }
 127
 128 void Camera::update_projection_matrix()
 129 {
 130         float frustum_h = (fov!=Geometry::Angle<float>::zero() ? tan(fov/2.0f)*clip_near : height/2);
 131         float frustum_w = frustum_h*aspect;
 132         float left = frustum_w*(frustum_x-1.0f);
 133         float right = frustum_w*(frustum_x+1.0f);
 134         float bottom = frustum_h*(frustum_y-1.0f);
 135         float top = frustum_h*(frustum_y+1.0f);
 136         if(fov>Geometry::Angle<float>::zero())
 137                 proj_matrix = Matrix::frustum(left, right, bottom, top, clip_near, clip_far);
 138         else
 139                 proj_matrix = Matrix::ortho(left, right, bottom, top, clip_near, clip_far);
 140         proj_matrix = Matrix::rotation(rotate, Vector3(0, 0, 1))*proj_matrix;
 141
 142         adjust_projection_matrix(proj_matrix);
 143
 144         shdata.uniform("clip_eye_matrix", proj_matrix);
 145         shdata.uniform("eye_clip_matrix", invert(proj_matrix));
 146 }
 147
 148 void Camera::update_object_matrix()
 149 {
 150         Vector3 right_dir = normalize(cross(look_dir, up_dir));
 151         Vector4 columns[4];
 152         columns[0] = compose(right_dir, 0.0f);
 153         columns[1] = compose(cross(right_dir, look_dir), 0.0f);
 154         columns[2] = compose(-look_dir, 0.0f);
 155         columns[3] = compose(position, 1.0f);
 156         matrix = Matrix::from_columns(columns);
 157         view_matrix = invert(matrix);
 158
 159         shdata.uniform("world_eye_matrix", matrix);
 160         shdata.uniform("eye_world_matrix", view_matrix);
 161 }
 162
 163 void Camera::set_debug_name(const string &name)
 164 {
 165 #ifdef DEBUG
 166         shdata.set_debug_name(name+" [UBO]");
 167 #else
 168         (void)name;
 169 #endif
 170 }
 171
 172
 173 Camera::Loader::Loader(Camera &c):
 174         DataFile::ObjectLoader<Camera>(c)
 175 {
 176         add("aspect_ratio", &Loader::aspect_ratio);
 177         add("depth_clip", &Loader::depth_clip);
 178         add("field_of_view", &Loader::field_of_view);
 179         add("look_at", &Loader::look_at);
 180         add("look_direction", &Loader::look_direction);
 181         add("orthographic", &Loader::orthographic);
 182         add("position", &Loader::position);
 183         add("up_direction", &Loader::up_direction);
 184 }
 185
 186 void Camera::Loader::aspect_ratio(float a)
 187 {
 188         obj.set_aspect_ratio(a);
 189 }
 190
 191 void Camera::Loader::depth_clip(float n, float f)
 192 {
 193         obj.set_depth_clip(n, f);
 194 }
 195
 196 void Camera::Loader::field_of_view(float a)
 197 {
 198         obj.set_field_of_view(Geometry::Angle<float>::from_degrees(a));
 199 }
 200
 201 void Camera::Loader::look_at(float x, float y, float z)
 202 {
 203         obj.look_at(Vector3(x, y, z));
 204 }
 205
 206 void Camera::Loader::look_direction(float x, float y, float z)
 207 {
 208         obj.set_look_direction(Vector3(x, y, z));
 209 }
 210
 211 void Camera::Loader::orthographic(float w, float h)
 212 {
 213         obj.set_orthographic(w, h);
 214 }
 215
 216 void Camera::Loader::position(float x, float y, float z)
 217 {
 218         obj.set_position(Vector3(x, y, z));
 219 }
 220
 221 void Camera::Loader::up_direction(float x, float y, float z)
 222 {
 223         obj.set_up_direction(Vector3(x, y, z));
 224 }
 225
 226 } // namespace GL
 227 } // namespace Msp