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