source/stereoview.cpp

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