Support building for Magic Leap.

support/magicleap/Servo2D/code/src/Servo2D.cpp

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+/* 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 <Servo2D.h>
+#include <lumin/node/RootNode.h>
+#include <lumin/node/QuadNode.h>
+#include <lumin/ui/Cursor.h>
+#include <ml_logging.h>
+#include <scenesGen.h>
+#include <SceneDescriptor.h>
+#include <EGL/egl.h>
+#include <GLES/gl.h>
+#include <string.h>
+
+// The viewport dimensions (in px).
+const unsigned int VIEWPORT_W = 500;
+const unsigned int VIEWPORT_H = 500;
+
+// The hidpi factor.
+const float HIDPI = 1.0;
+
+// The prism dimensions (in m).
+const float PRISM_W = 0.5;
+const float PRISM_H = 0.5;
+const float PRISM_D = 0.5;
+
+// A function which calls the ML logger, suitable for passing into Servo
+typedef void (*MLLogger)(MLLogLevel lvl, char* msg);
+void logger(MLLogLevel lvl, char* msg) {
+  if (MLLoggingLogLevelIsEnabled(lvl)) {
+    MLLoggingLog(lvl, ML_DEFAULT_LOG_TAG, msg);
+  }
+}
+
+// The functions Servo provides for hooking up to the ML.
+// For the moment, this doesn't handle input events.
+extern "C" ServoInstance init_servo(EGLContext, EGLSurface, EGLDisplay, MLLogger,
+                                    const char* url, int width, int height, float hidpi);
+extern "C" void heartbeat_servo(ServoInstance);
+extern "C" void discard_servo(ServoInstance);
+
+// Create a Servo2D instance
+Servo2D::Servo2D() {
+  ML_LOG(Debug, "Servo2D Constructor.");
+}
+
+// Destroy a Servo 2D instance
+Servo2D::~Servo2D() {
+  ML_LOG(Debug, "Servo2D Destructor.");
+  discard_servo(servo_);
+  servo_ = nullptr;
+}
+
+// The prism dimensions
+const glm::vec3 Servo2D::getInitialPrismExtents() const {
+  return glm::vec3(PRISM_W, PRISM_H, PRISM_D);
+}
+
+// Create the prism for Servo
+int Servo2D::createInitialPrism() {
+  prism_ = requestNewPrism(getInitialPrismExtents());
+  if (!prism_) {
+    ML_LOG(Error, "Servo2D Error creating default prism.");
+    return 1;
+  }
+  return 0;
+}
+
+// Initialize a Servo instance
+int Servo2D::init() {
+
+  ML_LOG(Debug, "Servo2D Initializing.");
+
+  // Set up the prism
+  createInitialPrism();
+  lumin::ui::Cursor::SetScale(prism_, 0.03f);
+  instanceInitialScenes();
+
+  // Get the planar resource that holds the EGL context
+  lumin::RootNode* root_node = prism_->getRootNode();
+  if (!root_node) {
+    ML_LOG(Error, "Servo2D Failed to get root node");
+    abort();
+    return 1;
+  }
+
+  std::string content_node_id = Servo2D_exportedNodes::content;
+  lumin::QuadNode* content_node = lumin::QuadNode::CastFrom(prism_->findNode(content_node_id, root_node));
+  if (!content_node) {
+    ML_LOG(Error, "Servo2D Failed to get content node");
+    abort();
+    return 1;
+  }
+
+  lumin::ResourceIDType plane_id = prism_->createPlanarEGLResourceId();
+  if (!plane_id) {
+    ML_LOG(Error, "Servo2D Failed to create EGL resource");
+    abort();
+    return 1;
+  }
+
+  plane_ = static_cast<lumin::PlanarResource*>(prism_->getResource(plane_id));
+  if (!plane_) {
+    ML_LOG(Error, "Servo2D Failed to create plane");
+    abort();
+    return 1;
+  }
+
+  content_node->setRenderResource(plane_id);
+
+  // Get the EGL context, surface and display.
+  EGLContext ctx = plane_->getEGLContext();
+  EGLSurface surf = plane_->getEGLSurface();
+  EGLDisplay dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
+  eglMakeCurrent(dpy, surf, surf, ctx);
+  glViewport(0, 0, VIEWPORT_W, VIEWPORT_H);
+
+  // Hook into servo
+  servo_ = init_servo(ctx, surf, dpy, logger, "https://servo.org", VIEWPORT_H, VIEWPORT_W, HIDPI);
+  if (!servo_) {
+    ML_LOG(Error, "Servo2D Failed to init servo instance");
+    abort();
+    return 1;
+  }
+
+  // Flush GL
+  glFlush();
+  eglSwapBuffers(dpy, surf);
+  return 0;
+}
+
+int Servo2D::deInit() {
+  ML_LOG(Debug, "Servo2D Deinitializing.");
+  return 0;
+}
+
+lumin::Node* Servo2D::instanceScene(const SceneDescriptor& scene) {
+  // Load resources.
+  if (!prism_->loadResourceModel(scene.getResourceModelPath())) {
+    ML_LOG(Info, "No resource model loaded");
+  }
+
+  // Load a scene file.
+  std::string editorObjectModelName;
+  if (!prism_->loadObjectModel(scene.getSceneGraphPath(), editorObjectModelName)) {
+    ML_LOG(Error, "Servo2D Failed to load object model");
+    abort();
+    return nullptr;
+  }
+
+  // Add scene to this prism.
+  lumin::Node* newTree = prism_->createAll(editorObjectModelName);
+  if (!prism_->getRootNode()->addChild(newTree)) {
+    ML_LOG(Error, "Servo2D Failed to add newTree to the prism root node");
+    abort();
+    return nullptr;
+  }
+
+  return newTree;
+}
+
+void Servo2D::instanceInitialScenes() {
+  // Iterate over all the exported scenes
+  for (auto& exportedSceneEntry : scenes::exportedScenes ) {
+
+    // If this scene was marked to be instanced at app initialization, do it
+    const SceneDescriptor &sd = exportedSceneEntry.second;
+    if (sd.getInitiallyInstanced()) {
+      instanceScene(sd);
+    }
+  }
+}
+
+bool Servo2D::updateLoop(float fDelta) {
+  // Get the EGL context, surface and display.
+  EGLContext ctx = plane_->getEGLContext();
+  EGLSurface surf = plane_->getEGLSurface();
+  EGLDisplay dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
+  eglMakeCurrent(dpy, surf, surf, ctx);
+  glViewport(0, 0, VIEWPORT_W, VIEWPORT_H);
+
+  // Hook into servo
+  heartbeat_servo(servo_);
+
+  // Flush GL
+  glFlush();
+  eglSwapBuffers(dpy, surf);
+
+  // Return true for your app to continue running, false to terminate the app.
+  return true;
+}
+
+bool Servo2D::eventListener(lumin::ServerEvent* event) {
+
+  // Place your event handling here.
+
+  // Return true if the event is consumed.
+  return false;
+}