first cut at reflections

interface/src/Application.cpp

@@ -1597,6 +1597,13 @@ void Application::init() {
     connect(_rearMirrorTools, SIGNAL(restoreView()), SLOT(restoreMirrorView()));
     connect(_rearMirrorTools, SIGNAL(shrinkView()), SLOT(shrinkMirrorView()));
     connect(_rearMirrorTools, SIGNAL(resetView()), SLOT(resetSensors()));
+    
+    
+    // set up our audio reflector
+    _audioReflector.setMyAvatar(getAvatar());
+    _audioReflector.setVoxels(_voxels.getTree());
+    _audioReflector.setAudio(getAudio());
+    connect(getAudio(), &Audio::audioBufferWrittenToDevice, &_audioReflector, &AudioReflector::addSamples);
 }
 
 void Application::closeMirrorView() {
@@ -2379,6 +2386,9 @@ void Application::displaySide(Camera& whichCamera, bool selfAvatarOnly) {
         // disable specular lighting for ground and voxels
         glMaterialfv(GL_FRONT, GL_SPECULAR, NO_SPECULAR_COLOR);
         
+        // draw the audio reflector overlay
+        _audioReflector.render();
+
         //  Draw voxels
         if (Menu::getInstance()->isOptionChecked(MenuOption::Voxels)) {
             PerformanceWarning warn(Menu::getInstance()->isOptionChecked(MenuOption::PipelineWarnings),

interface/src/Application.h

@@ -33,6 +33,7 @@
 #include <VoxelEditPacketSender.h>
 
 #include "Audio.h"
+#include "AudioReflector.h"
 #include "BuckyBalls.h"
 #include "Camera.h"
 #include "DatagramProcessor.h"
@@ -497,6 +498,7 @@ private:
     TouchEvent _lastTouchEvent;
     
     Overlays _overlays;
+    AudioReflector _audioReflector;
 };
 
 #endif /* defined(__interface__Application__) */

interface/src/AudioReflector.cpp

@@ -0,0 +1,274 @@
+//
+//  AudioReflector.cpp
+//  interface
+//
+//  Created by Brad Hefta-Gaub on 4/2/2014
+//  Copyright (c) 2014 High Fidelity, Inc. All rights reserved.
+//
+
+#include "AudioReflector.h"
+
+void AudioReflector::render() {
+    if (!_myAvatar) {
+        return; // exit early if not set up correctly
+    }
+
+    
+    /*
+    glm::vec3 position = _myAvatar->getHead()->getPosition();
+    const float radius = 0.25f;
+    glPushMatrix();
+        glTranslatef(position.x, position.y, position.z);
+        glutWireSphere(radius, 15, 15);
+    glPopMatrix();
+    */
+    
+    drawRays();
+}
+
+
+// delay = 1ms per foot
+//       = 3ms per meter
+// attenuation =
+//        BOUNCE_ATTENUATION_FACTOR [0.5] * (1/(1+distance))
+
+int getDelayFromDistance(float distance) {
+    const int DELAY_PER_METER = 3;
+    return DELAY_PER_METER * distance;
+}
+
+const float BOUNCE_ATTENUATION_FACTOR = 0.5f;
+
+float getDistanceAttenuationCoefficient(float distance) {
+    const float DISTANCE_SCALE = 2.5f;
+    const float GEOMETRIC_AMPLITUDE_SCALAR = 0.3f;
+    const float DISTANCE_LOG_BASE = 2.5f;
+    const float DISTANCE_SCALE_LOG = logf(DISTANCE_SCALE) / logf(DISTANCE_LOG_BASE);
+    
+    float distanceSquareToSource = distance * distance;
+
+    // calculate the distance coefficient using the distance to this node
+    float distanceCoefficient = powf(GEOMETRIC_AMPLITUDE_SCALAR,
+                                     DISTANCE_SCALE_LOG +
+                                     (0.5f * logf(distanceSquareToSource) / logf(DISTANCE_LOG_BASE)) - 1);
+    distanceCoefficient = std::min(1.0f, distanceCoefficient);
+    
+    return distanceCoefficient;
+}
+
+glm::vec3 getFaceNormal(BoxFace face) {
+    if (face == MIN_X_FACE) {
+        return glm::vec3(-1, 0, 0);
+    } else if (face == MAX_X_FACE) {
+        return glm::vec3(1, 0, 0);
+    } else if (face == MIN_Y_FACE) {
+        return glm::vec3(0, -1, 0);
+    } else if (face == MAX_Y_FACE) {
+        return glm::vec3(0, 1, 0);
+    } else if (face == MIN_Z_FACE) {
+        return glm::vec3(0, 0, -1);
+    } else if (face == MAX_Z_FACE) {
+        return glm::vec3(0, 0, 1);
+    }
+    return glm::vec3(0, 0, 0); //error case
+}
+
+
+void AudioReflector::drawReflections(const glm::vec3& origin, const glm::vec3& originalDirection, 
+                                        int bounces, const glm::vec3& originalColor) {
+                                        
+    glm::vec3 start = origin;
+    glm::vec3 direction = originalDirection;
+    glm::vec3 color = originalColor;
+    OctreeElement* elementHit;
+    float distance;
+    BoxFace face;
+    const float SLIGHTLY_SHORT = 0.999f; // slightly inside the distance so we're on the inside of the reflection point
+    const float COLOR_ADJUST_PER_BOUNCE = 0.75f;
+    
+    for (int i = 0; i < bounces; i++) {
+        if (_voxels->findRayIntersection(start, direction, elementHit, distance, face)) {
+            glm::vec3 end = start + (direction * (distance * SLIGHTLY_SHORT));
+            drawVector(start, end, color);
+        
+            glm::vec3 faceNormal = getFaceNormal(face);
+            direction = glm::normalize(glm::reflect(direction,faceNormal));
+            start = end;
+            color = color * COLOR_ADJUST_PER_BOUNCE;
+        }
+    }
+}
+
+void AudioReflector::calculateReflections(const glm::vec3& origin, const glm::vec3& originalDirection, 
+                                        int bounces, const AudioRingBuffer& samplesRingBuffer) {
+                                        
+    int samplesTouched = 0;
+                                        
+    glm::vec3 rightEarPosition = _myAvatar->getHead()->getRightEarPosition();
+    glm::vec3 leftEarPosition = _myAvatar->getHead()->getLeftEarPosition();
+    glm::vec3 start = origin;
+    glm::vec3 direction = originalDirection;
+    OctreeElement* elementHit;
+    float distance;
+    BoxFace face;
+    const float SLIGHTLY_SHORT = 0.999f; // slightly inside the distance so we're on the inside of the reflection point
+
+    // set up our buffers for our attenuated and delayed samples
+    AudioRingBuffer attenuatedLeftSamples(samplesRingBuffer.getSampleCapacity());
+    AudioRingBuffer attenuatedRightSamples(samplesRingBuffer.getSampleCapacity());
+    
+    const int NUMBER_OF_CHANNELS = 2;
+    int totalNumberOfSamples = samplesByteArray.size() / (sizeof(int16_t) * NUMBER_OF_CHANNELS);
+
+    for (int bounceNumber = 1; bounceNumber <= bounces; bounceNumber++) {
+        if (_voxels->findRayIntersection(start, direction, elementHit, distance, face)) {
+            glm::vec3 end = start + (direction * (distance * SLIGHTLY_SHORT));
+
+            glm::vec3 faceNormal = getFaceNormal(face);
+            direction = glm::normalize(glm::reflect(direction,faceNormal));
+            start = end;
+            
+            // calculate the distance to the ears
+            float rightEarDistance = glm::distance(end, rightEarPosition);
+            float leftEarDistance = glm::distance(end, leftEarPosition);
+            int rightEarDelay = getDelayFromDistance(rightEarDistance);
+            int leftEarDelay = getDelayFromDistance(leftEarDistance);
+            float rightEarAttenuation = getDistanceAttenuationCoefficient(rightEarDistance) * 
+                                                            (bounceNumber * BOUNCE_ATTENUATION_FACTOR);
+            float leftEarAttenuation = getDistanceAttenuationCoefficient(leftEarDistance) * 
+                                                            (bounceNumber * BOUNCE_ATTENUATION_FACTOR);
+
+            // run through the samples, and attenuate them                                                            
+            for (int sample = 0; sample < totalNumberOfSamples; sample++) {
+                int16_t leftSample = samplesRingBuffer[sample * NUMBER_OF_CHANNELS];
+                int16_t rightSample = samplesRingBuffer[(sample * NUMBER_OF_CHANNELS) + 1];
+                
+                attenuatedLeftSamples[sample * NUMBER_OF_CHANNELS] = leftSample * leftEarAttenuation;
+                attenuatedLeftSamples[sample * NUMBER_OF_CHANNELS + 1] = 0;
+
+                attenuatedRightSamples[sample * NUMBER_OF_CHANNELS] = 0;
+                attenuatedRightSamples[sample * NUMBER_OF_CHANNELS + 1] = rightSample * rightEarAttenuation;
+                
+                samplesTouched++;
+            }
+            
+            // now inject the attenuated array with the appropriate delay
+            _audio->addDelayedAudio(attenuatedLeftSamples, leftEarDelay);
+            _audio->addDelayedAudio(attenuatedRightSamples, rightEarDelay);
+        }
+    }
+}
+
+void AudioReflector::addSamples(AudioRingBuffer samples) {
+    quint64 start = usecTimestampNow();
+
+    glm::vec3 origin = _myAvatar->getHead()->getPosition();
+
+    glm::quat orientation = _myAvatar->getOrientation(); // _myAvatar->getHead()->getOrientation();
+    glm::vec3 right = glm::normalize(orientation * IDENTITY_RIGHT);
+    glm::vec3 up = glm::normalize(orientation * IDENTITY_UP);
+    glm::vec3 front = glm::normalize(orientation * IDENTITY_FRONT);
+    glm::vec3 left = -right;
+    glm::vec3 down = -up;
+    glm::vec3 back = -front;
+    glm::vec3 frontRightUp = glm::normalize(front + right + up);
+    glm::vec3 frontLeftUp = glm::normalize(front + left + up);
+    glm::vec3 backRightUp = glm::normalize(back + right + up);
+    glm::vec3 backLeftUp = glm::normalize(back + left + up);
+    glm::vec3 frontRightDown = glm::normalize(front + right + down);
+    glm::vec3 frontLeftDown = glm::normalize(front + left + down);
+    glm::vec3 backRightDown = glm::normalize(back + right + down);
+    glm::vec3 backLeftDown = glm::normalize(back + left + down);
+
+    const int BOUNCE_COUNT = 5;
+
+    calculateReflections(origin, frontRightUp, BOUNCE_COUNT, samples);
+    calculateReflections(origin, frontLeftUp, BOUNCE_COUNT, samples);
+    calculateReflections(origin, backRightUp, BOUNCE_COUNT, samples);
+    calculateReflections(origin, backLeftUp, BOUNCE_COUNT, samples);
+    calculateReflections(origin, frontRightDown, BOUNCE_COUNT, samples);
+    calculateReflections(origin, frontLeftDown, BOUNCE_COUNT, samples);
+    calculateReflections(origin, backRightDown, BOUNCE_COUNT, samples);
+    calculateReflections(origin, backLeftDown, BOUNCE_COUNT, samples);
+
+    calculateReflections(origin, front, BOUNCE_COUNT, samples);
+    calculateReflections(origin, back, BOUNCE_COUNT, samples);
+    calculateReflections(origin, left, BOUNCE_COUNT, samples);
+    calculateReflections(origin, right, BOUNCE_COUNT, samples);
+    calculateReflections(origin, up, BOUNCE_COUNT, samples);
+    calculateReflections(origin, down, BOUNCE_COUNT, samples);
+    quint64 end = usecTimestampNow();
+
+    qDebug() << "AudioReflector::addSamples()... samples.size()=" << samples.size() << " elapsed=" << (end - start);
+
+}
+
+void AudioReflector::drawRays() {
+    glm::vec3 origin = _myAvatar->getHead()->getPosition();
+    //glm::vec3 origin = _myAvatar->getHead()->getRightEarPosition();
+
+    glm::quat orientation = _myAvatar->getOrientation(); // _myAvatar->getHead()->getOrientation();
+    glm::vec3 right = glm::normalize(orientation * IDENTITY_RIGHT);
+    glm::vec3 up = glm::normalize(orientation * IDENTITY_UP);
+    glm::vec3 front = glm::normalize(orientation * IDENTITY_FRONT);
+    glm::vec3 left = -right;
+    glm::vec3 down = -up;
+    glm::vec3 back = -front;
+    glm::vec3 frontRightUp = glm::normalize(front + right + up);
+    glm::vec3 frontLeftUp = glm::normalize(front + left + up);
+    glm::vec3 backRightUp = glm::normalize(back + right + up);
+    glm::vec3 backLeftUp = glm::normalize(back + left + up);
+    glm::vec3 frontRightDown = glm::normalize(front + right + down);
+    glm::vec3 frontLeftDown = glm::normalize(front + left + down);
+    glm::vec3 backRightDown = glm::normalize(back + right + down);
+    glm::vec3 backLeftDown = glm::normalize(back + left + down);
+
+
+    const glm::vec3 RED(1,0,0);
+    const glm::vec3 GREEN(0,1,0);
+    const glm::vec3 BLUE(0,0,1);
+    const glm::vec3 PURPLE(1,0,1);
+    const glm::vec3 YELLOW(1,1,0);
+    const glm::vec3 CYAN(0,1,1);
+    const glm::vec3 DARK_RED(0.8f,0.2f,0.2f);
+    const glm::vec3 DARK_GREEN(0.2f,0.8f,0.2f);
+    const glm::vec3 DARK_BLUE(0.2f,0.2f,0.8f);
+    const glm::vec3 DARK_PURPLE(0.8f,0.2f,0.8f);
+    const glm::vec3 DARK_YELLOW(0.8f,0.8f,0.2f);
+    const glm::vec3 DARK_CYAN(0.2f,0.8f,0.8f);
+
+    const glm::vec3 WHITE(1,1,1);
+    const glm::vec3 GRAY(0.5f,0.5f,0.5f);
+    
+    const int BOUNCE_COUNT = 5;
+
+    drawReflections(origin, frontRightUp, BOUNCE_COUNT, RED);
+    drawReflections(origin, frontLeftUp, BOUNCE_COUNT, GREEN);
+    drawReflections(origin, backRightUp, BOUNCE_COUNT, BLUE);
+    drawReflections(origin, backLeftUp, BOUNCE_COUNT, CYAN);
+    drawReflections(origin, frontRightDown, BOUNCE_COUNT, PURPLE);
+    drawReflections(origin, frontLeftDown, BOUNCE_COUNT, YELLOW);
+    drawReflections(origin, backRightDown, BOUNCE_COUNT, WHITE);
+    drawReflections(origin, backLeftDown, BOUNCE_COUNT, DARK_RED);
+
+    drawReflections(origin, front, BOUNCE_COUNT, DARK_GREEN);
+    drawReflections(origin, back, BOUNCE_COUNT, DARK_BLUE);
+    drawReflections(origin, left, BOUNCE_COUNT, DARK_CYAN);
+    drawReflections(origin, right, BOUNCE_COUNT, DARK_PURPLE);
+    drawReflections(origin, up, BOUNCE_COUNT, DARK_YELLOW);
+    drawReflections(origin, down, BOUNCE_COUNT, GRAY);
+}
+
+void AudioReflector::drawVector(const glm::vec3& start, const glm::vec3& end, const glm::vec3& color) {
+    glDisable(GL_LIGHTING); // ??
+    glLineWidth(2.0);
+
+    // Draw the vector itself
+    glBegin(GL_LINES);
+    glColor3f(color.x,color.y,color.z);
+    glVertex3f(start.x, start.y, start.z);
+    glVertex3f(end.x, end.y, end.z);
+    glEnd();
+
+    glEnable(GL_LIGHTING); // ??
+}

interface/src/AudioReflector.h

@@ -0,0 +1,48 @@
+//
+//  AudioReflector.h
+//  interface
+//
+//  Created by Brad Hefta-Gaub on 4/2/2014
+//  Copyright (c) 2014 High Fidelity, Inc. All rights reserved.
+//
+
+#ifndef __interface__AudioReflector__
+#define __interface__AudioReflector__
+
+#include <VoxelTree.h>
+
+#include "Audio.h"
+#include "avatar/MyAvatar.h"
+
+class AudioReflector : public QObject {
+    Q_OBJECT
+public:
+    AudioReflector(QObject* parent = 0) : QObject(parent) { };
+
+    void setVoxels(VoxelTree* voxels) { _voxels = voxels; }
+    void setMyAvatar(MyAvatar* myAvatar) { _myAvatar = myAvatar; }
+    void setAudio(Audio* audio) { _audio = audio; }
+
+    void render();
+    
+public slots:
+    void addSamples(AudioRingBuffer samples);
+    
+signals:
+    
+private:
+    VoxelTree* _voxels; // used to access voxel scene
+    MyAvatar* _myAvatar; // access to listener
+    Audio* _audio; // access to audio API
+
+    void drawRays();
+    void drawVector(const glm::vec3& start, const glm::vec3& end, const glm::vec3& color);
+    void drawReflections(const glm::vec3& origin, const glm::vec3& direction, int bounces, const glm::vec3& color);
+
+    void calculateReflections(const glm::vec3& origin, const glm::vec3& originalDirection, 
+                                        int bounces, const AudioRingBuffer& samplesRingBuffer);
+
+};
+
+
+#endif /* defined(__interface__AudioReflector__) */

interface/src/avatar/Head.h

@@ -27,6 +27,8 @@ enum eyeContactTargets {
     MOUTH
 };
 
+const float EYE_EAR_GAP = 0.08f;
+
 class Avatar;
 class ProgramObject;
 
@@ -70,6 +72,11 @@ public:
     
     glm::quat getEyeRotation(const glm::vec3& eyePosition) const;
     
+    const glm::vec3& getRightEyePosition() const { return _rightEyePosition; }
+    const glm::vec3& getLeftEyePosition() const { return _leftEyePosition; }
+    glm::vec3 getRightEarPosition() const { return _rightEyePosition + (getRightDirection() * EYE_EAR_GAP) + (getFrontDirection() * -EYE_EAR_GAP); }
+    glm::vec3 getLeftEarPosition() const { return _leftEyePosition + (getRightDirection() * -EYE_EAR_GAP) + (getFrontDirection() * -EYE_EAR_GAP); }
+
     FaceModel& getFaceModel() { return _faceModel; }
     const FaceModel& getFaceModel() const { return _faceModel; }