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(0.07);
  19 }
  20
  21 void StereoView::set_combiner(const StereoCombiner &c)
  22 {
  23         combiner = &c;
  24
  25         unsigned w = width/combiner->get_width_divisor()*combiner->get_oversize();
  26         unsigned h = height/combiner->get_height_divisor()*combiner->get_oversize();
  27         left.create_target(w, h);
  28         right.create_target(w, h);
  29 }
  30
  31 void StereoView::set_eye_spacing(float s)
  32 {
  33         eye_spacing = s;
  34 }
  35
  36 void StereoView::setup_frame() const
  37 {
  38         offset_axis = normalize(cross(base_camera.get_look_direction(), base_camera.get_up_direction()))*0.5f;
  39
  40         EyeParams params;
  41         params.fov = combiner->get_field_of_view();
  42         if(params.fov==Geometry::Angle<float>::zero())
  43                 params.fov = base_camera.get_field_of_view();
  44
  45         params.aspect = base_camera.get_aspect();
  46         if(!combiner->is_aspect_kept())
  47                 params.aspect = params.aspect*combiner->get_height_divisor()/combiner->get_width_divisor();
  48
  49         params.near_clip = base_camera.get_near_clip();
  50         params.far_clip = base_camera.get_far_clip();
  51
  52         left.setup_frame(base_camera, offset_axis*-eye_spacing, params);
  53         right.setup_frame(base_camera, offset_axis*eye_spacing, params);
  54
  55         renderable.setup_frame();
  56 }
  57
  58 void StereoView::finish_frame() const
  59 {
  60         renderable.finish_frame();
  61 }
  62
  63 void StereoView::render(const GL::Tag &tag) const
  64 {
  65         setup_frame();
  66         left.render(renderable, tag);
  67         right.render(renderable, tag);
  68         combiner->render(left.target->color, right.target->color);
  69         finish_frame();
  70 }
  71
  72 void StereoView::render(GL::Renderer &renderer, const GL::Tag &tag) const
  73 {
  74         renderer.escape();
  75         return render(tag);
  76 }
  77
  78
  79 StereoView::RenderTarget::RenderTarget(unsigned width, unsigned height)
  80 {
  81         color.set_min_filter(GL::LINEAR);
  82         color.set_wrap(GL::CLAMP_TO_EDGE);
  83         color.storage(GL::RGB, width, height);
  84         fbo.attach(GL::COLOR_ATTACHMENT0, color);
  85
  86         depth.storage(GL::DEPTH_COMPONENT, width, height);
  87         fbo.attach(GL::DEPTH_ATTACHMENT, depth);
  88 }
  89
  90
  91 StereoView::Eye::Eye():
  92         target(0)
  93 { }
  94
  95 void StereoView::Eye::create_target(unsigned w, unsigned h)
  96 {
  97         delete target;
  98         target = new RenderTarget(w, h);
  99 }
 100
 101 void StereoView::Eye::setup_frame(const GL::Camera &base_camera, const GL::Vector3 &offset, const EyeParams &params) const
 102 {
 103         camera.set_position(base_camera.get_position()+offset);
 104         camera.set_up_direction(base_camera.get_up_direction());
 105         camera.set_look_direction(base_camera.get_look_direction());
 106
 107         camera.set_field_of_view(params.fov);
 108         camera.set_aspect(params.aspect);
 109         camera.set_depth_clip(params.near_clip, params.far_clip);
 110 }
 111
 112 void StereoView::Eye::render(const GL::Renderable &renderable, const GL::Tag &tag) const
 113 {
 114         GL::Bind bind_fbo(target->fbo);
 115         GL::Renderer renderer(&camera);
 116         renderable.render(renderer, tag);
 117 }
 118
 119 } // namespace VR
 120 } // namespace Msp