resize overlays when grabbed with both controllers

README.md

@@ -1,4 +1,4 @@
-# ovr-screen
+# sinpin-vr
 A SteamVR overlay for Linux+X11 that displays all your screens in VR.
 
 From my limited testing, this uses about half the CPU performance of Steam's built-in desktop overlay, if running at 60 FPS. Currently the default is 30 FPS which brings the factor to 3-4x. On my machine, the Steam desktop view increases cpu usage by about 100% of a CPU thread (looking only at the `steam` process), while this overlay uses around 25% at 30 FPS and 45% at 60 FPS.

src/app.h

@@ -24,12 +24,6 @@ struct InputHandles
 	vr::VRActionHandle_t grab;
 };
 
-struct Ray
-{
-	Overlay *overlay;
-	float distance;
-};
-
 class App
 {
   public:

src/controller.cpp

@@ -57,6 +57,21 @@ void Controller::ReleaseOverlay()
 	_grabbed_overlay = nullptr;
 }
 
+Ray Controller::GetLastRay()
+{
+	return _last_ray;
+}
+
+glm::vec3 Controller::GetLastPos()
+{
+	return _last_pos;
+}
+
+glm::vec3 Controller::GetLastRot()
+{
+	return _last_rotation;
+}
+
 void Controller::Update()
 {
 	UpdateStatus();
@@ -82,6 +97,10 @@ void Controller::UpdateLaser()
 	auto ray = _app->IntersectRay(controller_pos, forward, 5.0f);
 	float len = ray.distance;
 
+	_last_pos = controller_pos;
+	_last_rotation = forward;
+	_last_ray = ray;
+
 	auto hmd_global_pos = GetPos(_app->GetTrackerPose(0));
 	auto hmd_local_pos = glm::inverse(controller_pose) * glm::vec4(hmd_global_pos - controller_pos, 0);
 	hmd_local_pos.z = 0;
@@ -96,7 +115,7 @@ void Controller::UpdateLaser()
 		{
 			if (ray.overlay->IsHeld())
 			{
-				// TODO resize mode
+				ray.overlay->ControllerResize(this);
 			}
 			else
 			{

src/controller.h

@@ -20,6 +20,9 @@ class Controller
 	ControllerSide Side();
 
 	bool IsConnected();
+	Ray GetLastRay();
+	glm::vec3 GetLastPos();
+	glm::vec3 GetLastRot();
 
 	void SetHidden(bool state);
 
@@ -39,4 +42,7 @@ class Controller
 	bool _is_connected;
 	bool _hidden;
 	Overlay *_grabbed_overlay;
+	Ray _last_ray;
+	glm::vec3 _last_rotation;
+	glm::vec3 _last_pos;
 };

src/overlay.cpp

@@ -14,6 +14,7 @@ Overlay::Overlay(App *app, std::string name)
 	_name = name;
 	_app = app;
 	_holding_controller = nullptr;
+	_resize_controller = nullptr;
 	_width_m = 1;
 	_ratio = 1;
 	_hidden = false;
@@ -149,7 +150,7 @@ void Overlay::SetTargetWorld()
 
 Ray Overlay::IntersectRay(glm::vec3 origin, glm::vec3 direction, float max_len)
 {
-	float closest_dist = max_len;
+	float dist = max_len;
 	auto end = origin + direction * max_len;
 
 	auto panel_transform = GetTransformAbsolute();
@@ -166,46 +167,30 @@ Ray Overlay::IntersectRay(glm::vec3 origin, glm::vec3 direction, float max_len)
 
 	if (b.z < a.z && b.z < 0 && glm::abs(p.x) < (_width_m * 0.5f) && glm::abs(p.y) < (_width_m * 0.5f * _ratio))
 	{
-		float dist = r * max_len;
-		if (dist < closest_dist)
-		{
-			closest_dist = dist;
-		}
+		dist = glm::min(r * max_len, max_len);
 	}
-	return Ray{.overlay = this, .distance = closest_dist};
+	return Ray{.overlay = this, .distance = dist};
 }
 
 glm::mat4x4 Overlay::GetTransformAbsolute()
 {
-	if (_holding_controller != nullptr)
+	if (_target.type == TargetType::World)
 	{
 		VRMat pose;
-		TrackerID tracker;
-		auto err = _app->vr_overlay->GetOverlayTransformTrackedDeviceRelative(_id, &tracker, &pose);
-		assert(err == 0);
-		auto offset = ConvertMat(pose);
-		auto controller = _app->GetTrackerPose(_holding_controller->DeviceIndex());
-		return controller * offset;
+		vr::ETrackingUniverseOrigin tracking_universe;
+		_app->vr_overlay->GetOverlayTransformAbsolute(_id, &tracking_universe, &pose);
+		return ConvertMat(pose);
 	}
-	else
+	if (_target.type == TargetType::Tracker)
 	{
-		switch (_target.type)
-		{
-		case TargetType::World: {
-			VRMat pose;
-			vr::ETrackingUniverseOrigin tracking_universe;
-			_app->vr_overlay->GetOverlayTransformAbsolute(_id, &tracking_universe, &pose);
-			return ConvertMat(pose);
-		}
-		case TargetType::Tracker: {
-			VRMat pose;
-			_app->vr_overlay->GetOverlayTransformTrackedDeviceRelative(_id, &_target.id, &pose);
-			auto offset = ConvertMat(pose);
-			auto tracker_pose = _app->GetTrackerPose(_target.id);
-			return tracker_pose * offset;
-		}
-		}
+		VRMat pose;
+		_app->vr_overlay->GetOverlayTransformTrackedDeviceRelative(_id, &_target.id, &pose);
+		auto offset = ConvertMat(pose);
+		auto tracker_pose = _app->GetTrackerPose(_target.id);
+		return tracker_pose * offset;
 	}
+	printf("Error: overlay '%s' not set to a valid target", _name.c_str());
+	return ConvertMat(VRMatIdentity);
 }
 
 Target *Overlay::GetTarget()
@@ -223,7 +208,41 @@ void Overlay::Update()
 
 	if (_holding_controller != nullptr)
 	{
-		if (!_app->GetInputDigital(_app->_input_handles.grab, _holding_controller->InputHandle()).bState)
+		bool hold_controller_holding = _app->GetInputDigital(_app->_input_handles.grab, _holding_controller->InputHandle()).bState;
+		if (_resize_controller != nullptr)
+		{
+			bool resize_controller_holding = _app->GetInputDigital(_app->_input_handles.grab, _resize_controller->InputHandle()).bState;
+			if (!resize_controller_holding)
+			{
+				_resize_controller = nullptr;
+			}
+			else if (!hold_controller_holding)
+			{
+				_resize_controller = nullptr;
+				ControllerRelease();
+			}
+			else
+			{
+				auto pos_a = _holding_controller->GetLastPos() + _holding_controller->GetLastRot() * _resize_length_a;
+				auto pos_b = _resize_controller->GetLastPos() + _resize_controller->GetLastRot() * _resize_length_b;
+
+				float distance = glm::length(pos_a - pos_b);
+				float factor = (distance / _resize_base_distance);
+				float min_factor = 0.1f / _resize_original_size;
+				float max_factor = 5.0f / _resize_original_size;
+				factor = glm::clamp(factor, min_factor, max_factor);
+				float new_size = _resize_original_size * factor;
+
+				SetWidth(new_size);
+
+				auto transform = _target.transform;
+				auto pos = _resize_held_offset * factor;
+				transform.m[0][3] = pos.x;
+				transform.m[1][3] = pos.y;
+				SetTransformTracker(_holding_controller->DeviceIndex(), &transform);
+			}
+		}
+		else if (!hold_controller_holding)
 		{
 			ControllerRelease();
 		}
@@ -264,6 +283,33 @@ void Overlay::ControllerRelease()
 	_holding_controller = nullptr;
 }
 
+void Overlay::ControllerResize(Controller *controller)
+{
+	if (_resize_controller || controller == _holding_controller)
+	{
+		return;
+	}
+	for (auto child : _children)
+	{
+		if (!child->IsHeld())
+		{
+			child->SetTargetWorld();
+		}
+	}
+	_resize_controller = controller;
+	_resize_original_size = _width_m;
+
+	_resize_length_a = _holding_controller->GetLastRay().distance;
+	_resize_length_b = _resize_controller->GetLastRay().distance;
+
+	auto pos_a = _holding_controller->GetLastPos() + _holding_controller->GetLastRot() * _resize_length_a;
+	auto pos_b = _resize_controller->GetLastPos() + _resize_controller->GetLastRot() * _resize_length_b;
+
+	// distance between laser points
+	_resize_base_distance = glm::length(pos_a - pos_b);
+	_resize_held_offset = GetPos(_target.transform);
+}
+
 void Overlay::AddChildOverlay(Overlay *overlay)
 {
 	_children.push_back(overlay);

src/overlay.h

@@ -55,8 +55,9 @@ class Overlay
 
 	Ray IntersectRay(glm::vec3 origin, glm::vec3 direction, float max_len);
 
-	void ControllerRelease();
 	void ControllerGrab(Controller *controller);
+	void ControllerRelease();
+	void ControllerResize(Controller *controller);
 
 	void AddChildOverlay(Overlay *child);
 	void RemoveChildOverlay(Overlay *child);
@@ -73,6 +74,12 @@ class Overlay
 	float _alpha;
 	float _ratio;
 	Controller *_holding_controller;
+	Controller *_resize_controller;
+	float _resize_original_size;
+	float _resize_base_distance;
+	float _resize_length_a;
+	float _resize_length_b;
+	glm::vec3 _resize_held_offset;
 
 	std::vector<Overlay *> _children;
 

src/util.h

@@ -10,6 +10,13 @@ typedef vr::HmdMatrix34_t VRMat;
 const VRMat VRMatIdentity{{{1, 0, 0, 0}, {0, 1, 0, 0}, {0, 0, 1, 0}}};
 const int MAX_TRACKERS = vr::k_unMaxTrackedDeviceCount;
 
+class Overlay;
+struct Ray
+{
+	Overlay *overlay;
+	float distance;
+};
+
 inline void PrintVec(glm::vec3 v)
 {
 	printf("(%.2f, %.2f, %.2f)\n", v.x, v.y, v.z);