source/stereoview.cpp

   1 #include <msp/gl/renderer.h>
   2 #include "headtrackingcamera.h"
   3 #include "stereocombiner.h"
   4 #include "stereoview.h"
   5
   6 using namespace std;
   7
   8 namespace Msp {
   9 namespace VR {
  10
  11 StereoView::StereoView(const StereoCombiner &c, const GL::Camera &a):
  12         combiner(c),
  13         base_camera(a),
  14         head_camera(0)
  15 {
  16         init();
  17 }
  18
  19 StereoView::StereoView(const StereoCombiner &c, HeadTrackingCamera &a):
  20         combiner(c),
  21         base_camera(a),
  22         head_camera(&a)
  23 {
  24         init();
  25 }
  26
  27 void StereoView::init()
  28 {
  29         content = 0;
  30
  31         unsigned w = combiner.get_target_width();
  32         unsigned h = combiner.get_target_height();
  33         left.create_target(w, h);
  34         right.create_target(w, h);
  35
  36         set_eye_spacing(0.064);
  37         set_strabismus(Geometry::Angle<float>::zero());
  38 }
  39
  40 void StereoView::set_content(const GL::Renderable *r)
  41 {
  42         content = r;
  43 }
  44
  45 void StereoView::set_eye_spacing(float s)
  46 {
  47         eye_spacing = s;
  48 }
  49
  50 void StereoView::set_strabismus(const Geometry::Angle<float> &s)
  51 {
  52         strabismus = s;
  53 }
  54
  55 void StereoView::setup_frame() const
  56 {
  57         if(head_camera)
  58                 head_camera->update();
  59
  60         GL::Vector3 offset_axis = normalize(cross(base_camera.get_look_direction(), base_camera.get_up_direction()))*0.5f;
  61
  62         EyeParams params;
  63         params.fov = combiner.get_field_of_view();
  64         if(params.fov==Geometry::Angle<float>::zero())
  65                 params.fov = base_camera.get_field_of_view();
  66
  67         params.aspect = combiner.get_render_aspect();
  68         params.near_clip = base_camera.get_near_clip();
  69         params.far_clip = base_camera.get_far_clip();
  70
  71         float frustum_skew = combiner.get_frustum_skew();
  72         float halfw = tan(params.fov/2.0f)*params.aspect;
  73         frustum_skew = tan(Geometry::atan<float>(frustum_skew*halfw)+strabismus)/halfw;
  74
  75         left.setup_frame(base_camera, offset_axis*-eye_spacing, frustum_skew, params);
  76         right.setup_frame(base_camera, offset_axis*eye_spacing, -frustum_skew, params);
  77 }
  78
  79 void StereoView::render() const
  80 {
  81         combiner.prepare();
  82         setup_frame();
  83         if(content)
  84         {
  85                 content->setup_frame();
  86                 left.render(*content);
  87                 right.render(*content);
  88                 content->finish_frame();
  89         }
  90         combiner.render(left.target->color, right.target->color);
  91 }
  92
  93
  94 StereoView::RenderTarget::RenderTarget(unsigned width, unsigned height)
  95 {
  96         color.set_min_filter(GL::LINEAR);
  97         color.set_wrap(GL::CLAMP_TO_EDGE);
  98         color.storage(GL::RGB, width, height);
  99         fbo.attach(GL::COLOR_ATTACHMENT0, color);
 100
 101         depth.storage(GL::DEPTH_COMPONENT, width, height);
 102         fbo.attach(GL::DEPTH_ATTACHMENT, depth);
 103 }
 104
 105
 106 StereoView::Eye::Eye():
 107         target(0)
 108 { }
 109
 110 void StereoView::Eye::create_target(unsigned w, unsigned h)
 111 {
 112         delete target;
 113         target = new RenderTarget(w, h);
 114 }
 115
 116 void StereoView::Eye::setup_frame(const GL::Camera &base_camera, const GL::Vector3 &offset, float frustum_skew, const EyeParams &params) const
 117 {
 118         camera.set_position(base_camera.get_position()+offset);
 119         camera.set_up_direction(base_camera.get_up_direction());
 120         camera.set_look_direction(base_camera.get_look_direction());
 121
 122         camera.set_field_of_view(params.fov);
 123         camera.set_aspect(params.aspect);
 124         camera.set_depth_clip(params.near_clip, params.far_clip);
 125         camera.set_frustum_axis(frustum_skew, 0);
 126 }
 127
 128 void StereoView::Eye::render(const GL::Renderable &renderable) const
 129 {
 130         GL::Bind bind_fbo(target->fbo);
 131         target->fbo.clear(GL::COLOR_BUFFER_BIT|GL::DEPTH_BUFFER_BIT);
 132         GL::Renderer renderer(&camera);
 133         renderable.render(renderer);
 134 }
 135
 136 } // namespace VR
 137 } // namespace Msp