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DeviceDelegateGoogleVR.cpp
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DeviceDelegateGoogleVR.cpp
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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "DeviceDelegateGoogleVR.h"
#include "DeviceUtils.h"
#include "ElbowModel.h"
#include "GestureDelegate.h"
#include "vrb/CameraEye.h"
#include "vrb/Color.h"
#include "vrb/ConcreteClass.h"
#include "vrb/GLError.h"
#include "vrb/Matrix.h"
#include "vrb/Quaternion.h"
#include "vrb/RenderContext.h"
#include "vrb/Vector.h"
#include "vr/gvr/capi/include/gvr.h"
#include "vr/gvr/capi/include/gvr_controller.h"
#include "vr/gvr/capi/include/gvr_gesture.h"
#include <array>
#include <vector>
#include <EGL/egl.h>
namespace {
static const int32_t kMaxControllerCount = 2;
struct Controller {
vrb::Matrix transform;
bool enabled;
bool clicked;
bool touched;
crow::ElbowModel::HandEnum hand;
Controller()
: transform(vrb::Matrix::Identity())
, enabled(false)
, clicked(false)
, touched(false)
{}
};
}
namespace crow {
#define GET_GVR_CONTEXT() GetContext()
#define GVR_CHECK(X) X; \
{ \
gvr_context* context = GET_GVR_CONTEXT(); \
if (context && (gvr_get_error(context) != GVR_ERROR_NONE)) { \
VRB_LOG("GVR ERROR: %s at:%s:%s:%d", gvr_get_error_string(gvr_get_error(context)), \
__FILE__, __FUNCTION__, __LINE__); \
gvr_clear_error(context); \
} else if (!context) { \
VRB_LOG("UNABLE TO CHECK GVR ERROR: NO CONTEXT"); \
} \
}
struct DeviceDelegateGoogleVR::State {
gvr_context* gvr;
gvr_controller_context* controllerContext;
gvr_controller_state* controllerState;
gvr_gesture_context* gestureContext;
device::RenderMode renderMode;
gvr_buffer_viewport_list* viewportList;
gvr_buffer_viewport* leftViewport;
gvr_buffer_viewport* rightViewport;
gvr_mat4f gvrHeadMatrix;
vrb::Matrix headMatrix;
gvr_swap_chain* swapChain;
gvr_frame* frame;
gvr_sizei maxRenderSize;
gvr_sizei frameBufferSize;
vrb::RenderContextWeak context;
float near;
float far;
bool sixDofHead;
vrb::Color clearColor;
vrb::CameraEyePtr cameras[2];
ElbowModelPtr elbow;
GestureDelegatePtr gestures;
crow::ControllerDelegatePtr controllerDelegate;
std::array<Controller, kMaxControllerCount> controllers;
ImmersiveDisplayPtr immersiveDisplay;
bool lastSubmitDiscarded;
vrb::Matrix reorientMatrix;
bool recentered;
State()
: gvr(nullptr)
, controllerContext(nullptr)
, controllerState(nullptr)
, gestureContext(nullptr)
, renderMode(device::RenderMode::StandAlone)
, viewportList(nullptr)
, leftViewport(nullptr)
, rightViewport(nullptr)
, swapChain(nullptr)
, frame(nullptr)
, near(0.1f)
, far(100.f)
, sixDofHead(false)
, lastSubmitDiscarded(false)
, recentered(false)
{
frameBufferSize = {0,0};
maxRenderSize = {0,0};
gestures = GestureDelegate::Create();
reorientMatrix = vrb::Matrix::Identity();
}
gvr_context* GetContext() { return gvr; }
void Initialize() {
vrb::RenderContextPtr render = context.lock();
if (!render) {
return;
}
vrb::CreationContextPtr create = render->GetRenderThreadCreationContext();
cameras[device::EyeIndex(device::Eye::Left)] = vrb::CameraEye::Create(create);
cameras[device::EyeIndex(device::Eye::Right)] = vrb::CameraEye::Create(create);
elbow = ElbowModel::Create();
GVR_CHECK(gvr_refresh_viewer_profile(gvr));
viewportList = GVR_CHECK(gvr_buffer_viewport_list_create(gvr));
leftViewport = GVR_CHECK(gvr_buffer_viewport_create(gvr));
rightViewport = GVR_CHECK(gvr_buffer_viewport_create(gvr));
}
void InitializeControllers() {
if (!gvr) {
VRB_LOG("Failed to initialize controllers. No GVR context.");
return;
}
int32_t options = GVR_CHECK(gvr_controller_get_default_options());
options |= GVR_CONTROLLER_ENABLE_GYRO | GVR_CONTROLLER_ENABLE_ACCEL | GVR_CONTROLLER_ENABLE_ARM_MODEL;
controllerContext = GVR_CHECK(gvr_controller_create_and_init(options, gvr));
GVR_CHECK(gvr_controller_resume(controllerContext));
controllerState = GVR_CHECK(gvr_controller_state_create());
const gvr_user_prefs* prefs = GVR_CHECK(gvr_get_user_prefs(gvr));
if (prefs) {
controllers[0].hand = ((gvr_user_prefs_get_controller_handedness(prefs) == GVR_CONTROLLER_RIGHT_HANDED) ?
ElbowModel::HandEnum::Right : ElbowModel::HandEnum::Left);
controllers[1].hand = (controllers[0].hand == ElbowModel::HandEnum::Right ? ElbowModel::HandEnum::Left : ElbowModel::HandEnum::Right);
} else {
controllers[0].hand = ElbowModel::HandEnum::Right;
controllers[1].hand = ElbowModel::HandEnum::Left;
}
gestureContext = gvr_gesture_context_create();
}
void Shutdown() {
}
void
SetRenderMode(const device::RenderMode aMode) {
if (aMode != renderMode) {
renderMode = aMode;
reorientMatrix = vrb::Matrix::Identity();
CreateSwapChain();
}
}
gvr_sizei GetImmersiveModeSize() {
// GVR SDK states that thee maximum effective render target size can be very large.
// Most applications need to scale down to compensate.
// Half pixel sizes are used by scaling each dimension by sqrt(2)/2 ~= 7/10ths.
gvr_sizei result;
result.width = (7 * maxRenderSize.width) / 10;
result.height = (7 * maxRenderSize.height) / 10;
return result;
}
void
CreateSwapChain() {
if (swapChain) {
// gvr_swap_chain_destroy will set the pointer to null
GVR_CHECK(gvr_swap_chain_destroy(&swapChain));
}
gvr_buffer_spec* spec = GVR_CHECK(gvr_buffer_spec_create(gvr));
gvr_sizei size = maxRenderSize;
if (renderMode == device::RenderMode::Immersive) {
size = GetImmersiveModeSize();
GVR_CHECK(gvr_buffer_spec_set_size(spec, size));
GVR_CHECK(gvr_buffer_spec_set_samples(spec, 0));
GVR_CHECK(gvr_buffer_spec_set_color_format(spec, GVR_COLOR_FORMAT_RGBA_8888));
GVR_CHECK(gvr_buffer_spec_set_depth_stencil_format(spec, GVR_DEPTH_STENCIL_FORMAT_DEPTH_16));
} else {
GVR_CHECK(gvr_buffer_spec_set_size(spec, size));
GVR_CHECK(gvr_buffer_spec_set_samples(spec, 2));
GVR_CHECK(gvr_buffer_spec_set_color_format(spec, GVR_COLOR_FORMAT_RGBA_8888));
GVR_CHECK(gvr_buffer_spec_set_depth_stencil_format(spec, GVR_DEPTH_STENCIL_FORMAT_DEPTH_24));
}
swapChain = GVR_CHECK(gvr_swap_chain_create(gvr, (const gvr_buffer_spec**)&spec, 1));
GVR_CHECK(gvr_buffer_spec_destroy(&spec));
GVR_CHECK(gvr_get_recommended_buffer_viewports(gvr, viewportList));
size = GVR_CHECK(gvr_swap_chain_get_buffer_size(swapChain, 0))
if ((size.width != frameBufferSize.width) || (size.height != frameBufferSize.height)) {
frameBufferSize.width = size.width;
frameBufferSize.height = size.height;
GVR_CHECK(gvr_swap_chain_resize_buffer(swapChain, 0, frameBufferSize));
VRB_LOG("Resize Swap Chain %d,%d", frameBufferSize.width, frameBufferSize.height);
}
if (immersiveDisplay) {
immersiveDisplay->SetEyeResolution(frameBufferSize.width / 2, frameBufferSize.height);
}
}
void
UpdateCameras() {
gvr_mat4f eyes[GVR_NUM_EYES];
for (int32_t index = 0; index < GVR_NUM_EYES; index++) {
eyes[index] = GVR_CHECK(gvr_get_eye_from_head_matrix(gvr, index));
cameras[index]->SetEyeTransform(vrb::Matrix::Translation(
vrb::Vector(-eyes[index].m[0][3], -eyes[index].m[1][3], -eyes[index].m[2][3])));
cameras[index]->SetHeadTransform(headMatrix);
}
if (!viewportList || !leftViewport || !rightViewport) {
VRB_LOG("ERROR: view port lists not created");
return;
}
GVR_CHECK(gvr_get_recommended_buffer_viewports(gvr, viewportList));
GVR_CHECK(gvr_buffer_viewport_list_get_item(viewportList, 0, leftViewport));
GVR_CHECK(gvr_buffer_viewport_list_get_item(viewportList, 1, rightViewport));
gvr_rectf fovs[GVR_NUM_EYES];
fovs[GVR_LEFT_EYE] = GVR_CHECK(gvr_buffer_viewport_get_source_fov(leftViewport));
fovs[GVR_RIGHT_EYE] = GVR_CHECK(gvr_buffer_viewport_get_source_fov(rightViewport));
for (int32_t index = 0; index < GVR_NUM_EYES; index++) {
cameras[index]->SetPerspective(
vrb::Matrix::PerspectiveMatrixFromDegrees(fovs[index].left, fovs[index].right,
fovs[index].top, fovs[index].bottom,
near, far));
}
if (!immersiveDisplay) {
return;
}
for (int32_t index = 0; index < GVR_NUM_EYES; index++) {
const device::Eye which = (index == GVR_LEFT_EYE ? device::Eye::Left : device::Eye::Right);
immersiveDisplay->SetEyeOffset(which,
-eyes[index].m[0][3], -eyes[index].m[1][3],
-eyes[index].m[2][3]);
immersiveDisplay->SetFieldOfView(which, fovs[index].left, fovs[index].right, fovs[index].top,
fovs[index].bottom);
}
}
void
UpdateControllers() {
int32_t controllerCount = GVR_CHECK(gvr_controller_get_count(controllerContext));
if (controllerCount > kMaxControllerCount) {
controllerCount = kMaxControllerCount;
}
if (!controllerDelegate) {
return;
}
for (int32_t index = 0; index < controllerCount; index++) {
Controller& controller = controllers[index];
GVR_CHECK(gvr_controller_state_update(controllerContext, index, controllerState));
if (gvr_controller_state_get_connection_state(controllerState) != GVR_CONTROLLER_CONNECTED) {
if (controller.enabled) {
VRB_ERROR("Controller not connected.");
controller.enabled = false;
controllerDelegate->SetEnabled(index, false);
}
continue;
} else if (!controller.enabled) {
VRB_LOG("Controller Connected");
controller.enabled = true;
controllerDelegate->SetEnabled(index, true);
controllerDelegate->SetVisible(index, true);
controllerDelegate->SetCapabilityFlags(index, device::Orientation);
}
recentered = recentered || gvr_controller_state_get_recentered(controllerState);
gvr_quatf ori = gvr_controller_state_get_orientation(controllerState);
vrb::Quaternion quat(ori.qx, ori.qy, ori.qz, ori.qw);
controller.transform = vrb::Matrix::Rotation(vrb::Quaternion(ori.qx, ori.qy, ori.qz, ori.qw));
if (elbow) {
controller.transform = elbow->GetTransform(controller.hand, headMatrix, controller.transform);
}
controllerDelegate->SetTransform(index, controller.transform);
controllerDelegate->SetLeftHanded(index, controller.hand == ElbowModel::HandEnum::Left);
controllerDelegate->SetButtonCount(index, 1); // For immersive mode
// Index 0 is the dummy button so skip it.
for (int ix = 1; ix < GVR_CONTROLLER_BUTTON_COUNT; ix++) {
const uint64_t buttonMask = (uint64_t) 0x01 << (ix - 1);
const bool clicked = gvr_controller_state_get_button_state(controllerState, ix);
if (ix == GVR_CONTROLLER_BUTTON_CLICK) {
const bool touched = gvr_controller_state_is_touching(controllerState);
const int kNumImmersiveAxes = 2;
float immersiveAxes[kNumImmersiveAxes] = { 0.0f, 0.0f };
if (touched) {
gvr_vec2f axes = gvr_controller_state_get_touch_pos(controllerState);
immersiveAxes[0] = axes.x * 2.0f - 1.0f;
immersiveAxes[1] = axes.y * 2.0f - 1.0f;
controllerDelegate->SetTouchPosition(index, axes.x, axes.y);
} else if (touched != controller.touched){
controllerDelegate->EndTouch(index);
}
controller.touched = touched;
controller.clicked = clicked;
controllerDelegate->SetButtonState(index, ControllerDelegate::BUTTON_TOUCHPAD, 0, clicked, touched);
controllerDelegate->SetAxes(index, immersiveAxes, kNumImmersiveAxes);
}
else if (ix == GVR_CONTROLLER_BUTTON_APP) {
controllerDelegate->SetButtonState(index, ControllerDelegate::BUTTON_APP, -1, clicked, clicked);
}
}
}
if (!gestures) {
return;
}
// Detect the gestures.
gvr_gesture_update(controllerState, gestureContext);
// Get the number of detected gestures.
const int32_t gestureCount = gvr_gesture_get_count(gestureContext);
gestures->Reset();
for (int count = 0; count < gestureCount; count++) {
const gvr_gesture* gesture = gvr_gesture_get(gestureContext, count);
switch (gvr_gesture_get_type(gesture)) {
case GVR_GESTURE_SWIPE:
{
// Handle swipe gesture.
gvr_gesture_direction direction = gvr_gesture_get_direction(gesture);
if (direction == GVR_GESTURE_DIRECTION_LEFT) {
gestures->AddGesture(GestureType::SwipeLeft);
} else if (direction == GVR_GESTURE_DIRECTION_RIGHT) {
gestures->AddGesture(GestureType::SwipeRight);
}
}
break;
case GVR_GESTURE_SCROLL_START:
// Handle the start of a sequence of scroll gestures.
break;
case GVR_GESTURE_SCROLL_UPDATE:
// Handle an initialize in a sequence of scroll gestures.
break;
case GVR_GESTURE_SCROLL_END:
// Handle the end of a sequence of scroll gestures.
break;
default:
// Unexpected gesture type.
break;
}
}
}
};
#undef GET_GVR_CONTEXT
#define GET_GVR_CONTEXT() m.GetContext()
DeviceDelegateGoogleVRPtr
DeviceDelegateGoogleVR::Create(vrb::RenderContextPtr& aContext, void* aGVRContext) {
DeviceDelegateGoogleVRPtr result = std::make_shared<vrb::ConcreteClass<DeviceDelegateGoogleVR, DeviceDelegateGoogleVR::State> >();
result->m.context = aContext;
result->m.gvr = (gvr_context*)aGVRContext;
result->m.Initialize();
return result;
}
void
DeviceDelegateGoogleVR::SetRenderMode(const device::RenderMode aMode) {
m.SetRenderMode(aMode);
}
device::RenderMode
DeviceDelegateGoogleVR::GetRenderMode() {
return m.renderMode;
}
void
DeviceDelegateGoogleVR::RegisterImmersiveDisplay(ImmersiveDisplayPtr aDisplay) {
m.immersiveDisplay = std::move(aDisplay);
if (!m.immersiveDisplay) {
return;
}
m.immersiveDisplay->SetDeviceName("Daydream");
m.immersiveDisplay->SetCapabilityFlags(device::Position | device::Orientation | device::Present);
gvr_sizei size = m.GetImmersiveModeSize();
m.immersiveDisplay->SetEyeResolution(size.width / 2, size.height);
m.immersiveDisplay->CompleteEnumeration();
m.UpdateCameras();
}
GestureDelegateConstPtr
DeviceDelegateGoogleVR::GetGestureDelegate() {
return m.gestures;
}
vrb::CameraPtr
DeviceDelegateGoogleVR::GetCamera(const device::Eye aWhich) {
const int32_t index = device::EyeIndex(aWhich);
if (index < 0) { return nullptr; }
return m.cameras[index];
}
const vrb::Matrix&
DeviceDelegateGoogleVR::GetHeadTransform() const {
return m.cameras[0]->GetHeadTransform();
}
const vrb::Matrix&
DeviceDelegateGoogleVR::GetReorientTransform() const {
return m.reorientMatrix;
}
void
DeviceDelegateGoogleVR::SetReorientTransform(const vrb::Matrix& aMatrix) {
m.reorientMatrix = aMatrix;
}
void
DeviceDelegateGoogleVR::SetClearColor(const vrb::Color& aColor) {
m.clearColor = aColor;
}
void
DeviceDelegateGoogleVR::SetClipPlanes(const float aNear, const float aFar) {
m.near = aNear;
m.far = aFar;
}
void
DeviceDelegateGoogleVR::SetControllerDelegate(ControllerDelegatePtr& aController) {
m.controllerDelegate = aController;
if (!m.controllerDelegate) {
return;
}
for (int32_t index = 0; index < kMaxControllerCount; index++) {
m.controllerDelegate->CreateController(index, 0, "Daydream Controller");
}
}
void
DeviceDelegateGoogleVR::ReleaseControllerDelegate() {
m.controllerDelegate = nullptr;
}
int32_t
DeviceDelegateGoogleVR::GetControllerModelCount() const {
return 1;
}
const std::string
DeviceDelegateGoogleVR::GetControllerModelName(const int32_t aModelIndex) const {
static const std::string name("vr_controller_daydream.obj");
return aModelIndex == 0 ? name : "";
}
void
DeviceDelegateGoogleVR::ProcessEvents() {
m.UpdateControllers();
}
void
DeviceDelegateGoogleVR::StartFrame() {
static const vrb::Vector kAverageHeight(0.0f, 1.7f, 0.0f);
gvr_clock_time_point when = GVR_CHECK(gvr_get_time_point_now());
// 50ms into the future is what GVR docs recommends using for head rotation prediction.
when.monotonic_system_time_nanos += 50000000;
m.gvrHeadMatrix = GVR_CHECK(gvr_get_head_space_from_start_space_transform(m.gvr, when));
if (!m.sixDofHead) {
m.gvrHeadMatrix = GVR_CHECK(gvr_apply_neck_model(m.gvr, m.gvrHeadMatrix, 1.0));
}
m.headMatrix = vrb::Matrix::FromRowMajor(m.gvrHeadMatrix.m);
m.headMatrix = m.headMatrix.Inverse();
if (m.renderMode == device::RenderMode::StandAlone) {
if (m.recentered) {
m.reorientMatrix = DeviceUtils::CalculateReorientationMatrix(m.headMatrix, kAverageHeight);
}
m.headMatrix.TranslateInPlace(kAverageHeight);
}
m.UpdateCameras();
m.recentered = false;
if (!m.lastSubmitDiscarded) {
m.frame = GVR_CHECK(gvr_swap_chain_acquire_frame(m.swapChain));
if (!m.frame) {
// Sometimes the swap chain seems to not initialized correctly so that
// frames can not be acquired. Recreating the swap chain seems to fix the
// issue.
VRB_LOG("Unable to acquire GVR frame. Recreating swap chain.");
m.CreateSwapChain();
VRB_GL_CHECK(glEnable(GL_BLEND));
}
}
GVR_CHECK(gvr_frame_bind_buffer(m.frame, 0));
VRB_GL_CHECK(glClearColor(m.clearColor.Red(), m.clearColor.Green(), m.clearColor.Blue(), m.clearColor.Alpha()));
VRB_GL_CHECK(glEnable(GL_BLEND));
}
static void
SetUpViewportAndScissor(const gvr_sizei& framebuf_size,
const gvr_buffer_viewport* params) {
const gvr::Rectf& rect = gvr_buffer_viewport_get_source_uv(params);
int left = static_cast<int>(rect.left * framebuf_size.width);
int bottom = static_cast<int>(rect.bottom * framebuf_size.width);
int width = static_cast<int>((rect.right - rect.left) * framebuf_size.width);
int height = static_cast<int>((rect.top - rect.bottom) * framebuf_size.height);
VRB_GL_CHECK(glViewport(left, bottom, width, height));
VRB_GL_CHECK(glEnable(GL_SCISSOR_TEST));
VRB_GL_CHECK(glScissor(left, bottom, width, height));
VRB_GL_CHECK(glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT));
}
void
DeviceDelegateGoogleVR::BindEye(const device::Eye aWhich) {
if (aWhich == device::Eye::Left) {
SetUpViewportAndScissor(m.frameBufferSize, m.leftViewport);
} else if (aWhich == device::Eye::Right) {
SetUpViewportAndScissor(m.frameBufferSize, m.rightViewport);
} else {
VRB_LOG("Unable to bind unknown eye type");
}
}
void
DeviceDelegateGoogleVR::EndFrame(const bool aDiscard) {
if (!m.frame) {
VRB_LOG("Unable to submit null frame");
}
GVR_CHECK(gvr_frame_unbind(m.frame));
m.lastSubmitDiscarded = aDiscard;
if (!aDiscard) {
GVR_CHECK(gvr_frame_submit(&m.frame, m.viewportList, m.gvrHeadMatrix));
}
}
void
DeviceDelegateGoogleVR::InitializeGL() {
gvr_initialize_gl(m.gvr);
m.maxRenderSize = GVR_CHECK(gvr_get_maximum_effective_render_target_size(m.gvr));
m.CreateSwapChain();
m.InitializeControllers();
VRB_GL_CHECK(glEnable(GL_DEPTH_TEST));
VRB_GL_CHECK(glEnable(GL_CULL_FACE));
m.sixDofHead = GVR_CHECK(gvr_is_feature_supported(m.gvr, GVR_FEATURE_HEAD_POSE_6DOF));
VRB_LOG("6DoF head tracking supported: %s", (m.sixDofHead ? "True" : "False"));
}
void
DeviceDelegateGoogleVR::Pause() {
if (m.controllerContext) {
VRB_LOG("Pause GVR controller");
GVR_CHECK(gvr_controller_pause(m.controllerContext));
}
if (m.gvr) {
VRB_LOG("Pause GVR tracking");
GVR_CHECK(gvr_pause_tracking(m.gvr));
}
}
void
DeviceDelegateGoogleVR::Resume() {
if (m.gvr) {
VRB_LOG("Resume GVR tracking");
GVR_CHECK(gvr_refresh_viewer_profile(m.gvr));
GVR_CHECK(gvr_resume_tracking(m.gvr));
}
if (m.controllerContext) {
VRB_LOG("Resume GVR controller");
GVR_CHECK(gvr_controller_resume(m.controllerContext));
}
m.reorientMatrix = vrb::Matrix::Identity();
}
DeviceDelegateGoogleVR::DeviceDelegateGoogleVR(State& aState) : m(aState) {}
DeviceDelegateGoogleVR::~DeviceDelegateGoogleVR() { m.Shutdown(); }
} // namespace crow