Implement a basic OpenVR driver

[libs/vr.git] / source / openvr / openvrcombiner.cpp

diff --git a/source/openvr/openvrcombiner.cpp b/source/openvr/openvrcombiner.cpp
new file mode 100644 (file)
index 0000000..2272a1a
--- /dev/null
+++ b/source/openvr/openvrcombiner.cpp
@@ -0,0 +1,57 @@
+#include <openvr.h>
+#include "openvrcombiner.h"
+#include "openvrdevice.h"
+
+namespace Msp {
+namespace VR {
+
+struct OpenVRCombiner::Private
+{
+       static Frustum get_projection(vr::EVREye);
+};
+
+
+OpenVRCombiner::OpenVRCombiner(OpenVRDevice &d):
+       device(d)
+{
+       vr::IVRSystem *vr_sys = vr::VRSystem();
+       uint32_t w, h;
+       vr_sys->GetRecommendedRenderTargetSize(&w, &h);
+       target_width = w;
+       target_height = h;
+
+       Frustum left_frustum = Private::get_projection(vr::Eye_Left);
+       Frustum right_frustum = Private::get_projection(vr::Eye_Right);
+       configure_eye_frustums(left_frustum, right_frustum);
+}
+
+void OpenVRCombiner::prepare() const
+{
+       device.update_pose_matrices();
+}
+
+void OpenVRCombiner::render(const GL::Texture2D &left, const GL::Texture2D &right) const
+{
+       vr::Texture_t tex;
+       tex.eType = vr::API_OpenGL;
+       tex.eColorSpace = vr::ColorSpace_Gamma;
+
+       vr::IVRCompositor *compositor = vr::VRCompositor();
+       tex.handle = reinterpret_cast<void *>(left.get_id());
+       compositor->Submit(vr::Eye_Left, &tex);
+       tex.handle = reinterpret_cast<void *>(right.get_id());
+       compositor->Submit(vr::Eye_Right, &tex);
+}
+
+
+StereoCombiner::Frustum OpenVRCombiner::Private::get_projection(vr::EVREye eye)
+{
+       Frustum frustum;
+       /* The parameter order is documented as left, right, top, bottom; however
+       the third parameter is actually negative and fourth one positive. */
+       vr::VRSystem()->GetProjectionRaw(eye, &frustum.left, &frustum.right, &frustum.bottom, &frustum.top);
+       return frustum;
+}
+
+} // namespace VR
+} // namespace Msp