From 18ea1d6a855a1e57989c4fd43781b768b41c6d9d Mon Sep 17 00:00:00 2001
From: Andrzej Kapolka <drzej.k@gmail.com>
Date: Fri, 21 Feb 2014 10:16:06 -0800
Subject: [PATCH] More work on billboards.

---
 interface/src/Application.cpp        | 32 +++++++++++++++++++---------
 interface/src/Application.h          |  2 +-
 libraries/shared/src/PacketHeaders.h |  3 ++-
 3 files changed, 25 insertions(+), 12 deletions(-)

diff --git a/interface/src/Application.cpp b/interface/src/Application.cpp
index 30a6fb4e74..9ef3fdc76b 100644
--- a/interface/src/Application.cpp
+++ b/interface/src/Application.cpp
@@ -527,7 +527,7 @@ void Application::paintGL() {
         _glowEffect.render();
 
         if (Menu::getInstance()->isOptionChecked(MenuOption::Mirror)) {
-            renderRearViewMirror();
+            renderRearViewMirror(_mirrorViewRect);
             
         } else if (Menu::getInstance()->isOptionChecked(MenuOption::FullscreenMirror)) {
             _rearMirrorTools->render(true);
@@ -2679,10 +2679,20 @@ void Application::setupWorldLight() {
 }
 
 QImage Application::renderAvatarBillboard() {
-    renderRearViewMirror(true);
+    _textureCache.getPrimaryFramebufferObject()->bind();
+    
+    glDisable(GL_BLEND);
+
+    const int BILLBOARD_SIZE = 128;
+    renderRearViewMirror(QRect(0, _glWidget->height() - BILLBOARD_SIZE, BILLBOARD_SIZE, BILLBOARD_SIZE), true);
+    
+    QImage image(BILLBOARD_SIZE, BILLBOARD_SIZE, QImage::Format_ARGB32);
+    glReadPixels(0, 0, BILLBOARD_SIZE, BILLBOARD_SIZE, GL_BGRA, GL_UNSIGNED_BYTE, image.bits());
+    
+    glEnable(GL_BLEND);
+    
+    _textureCache.getPrimaryFramebufferObject()->release();
     
-    QImage image(_glWidget->width(), _glWidget->height(), QImage::Format_ARGB32);
-    glReadPixels(0, 0, _glWidget->width(), _glWidget->height(), GL_BGRA, GL_UNSIGNED_BYTE, image.bits());
     return image;
 }
 
@@ -3603,9 +3613,13 @@ void Application::renderCoverageMapsRecursively(CoverageMap* map) {
     }
 }
 
-void Application::renderRearViewMirror(bool billboard) {
+void Application::renderRearViewMirror(const QRect& region, bool billboard) {
     bool eyeRelativeCamera = false;
-    if (_rearMirrorTools->getZoomLevel() == BODY && !billboard) {
+    if (billboard) {
+        const float BILLBOARD_DISTANCE = 5.0f;
+        _mirrorCamera.setDistance(BILLBOARD_DISTANCE * _myAvatar->getScale());
+        _mirrorCamera.setTargetPosition(_myAvatar->getPosition());
+    } else if (_rearMirrorTools->getZoomLevel() == BODY) {
         _mirrorCamera.setDistance(MIRROR_REARVIEW_BODY_DISTANCE * _myAvatar->getScale());
         _mirrorCamera.setTargetPosition(_myAvatar->getChestPosition());
     } else { // HEAD zoom level
@@ -3625,10 +3639,8 @@ void Application::renderRearViewMirror(bool billboard) {
     _mirrorCamera.update(1.0f/_fps);
 
     // set the bounds of rear mirror view
-    glViewport(_mirrorViewRect.x(), _glWidget->height() - _mirrorViewRect.y() - _mirrorViewRect.height(),
-        _mirrorViewRect.width(), _mirrorViewRect.height());
-    glScissor(_mirrorViewRect.x(), _glWidget->height() - _mirrorViewRect.y() - _mirrorViewRect.height(),
-        _mirrorViewRect.width(), _mirrorViewRect.height());
+    glViewport(region.x(), _glWidget->height() - region.y() - region.height(), region.width(), region.height());
+    glScissor(region.x(), _glWidget->height() - region.y() - region.height(), region.width(), region.height());
     bool updateViewFrustum = false;
     updateProjectionMatrix(_mirrorCamera, updateViewFrustum);
     glEnable(GL_SCISSOR_TEST);
diff --git a/interface/src/Application.h b/interface/src/Application.h
index b35e4b4e08..d7bafc72b1 100644
--- a/interface/src/Application.h
+++ b/interface/src/Application.h
@@ -333,7 +333,7 @@ private:
     void displayStats();
     void checkStatsClick();
     void toggleStatsExpanded();
-    void renderRearViewMirror(bool billboard = false);
+    void renderRearViewMirror(const QRect& region, bool billboard = false);
     void renderViewFrustum(ViewFrustum& viewFrustum);
 
     void checkBandwidthMeterClick();
diff --git a/libraries/shared/src/PacketHeaders.h b/libraries/shared/src/PacketHeaders.h
index c1a5a34114..bb5821dd67 100644
--- a/libraries/shared/src/PacketHeaders.h
+++ b/libraries/shared/src/PacketHeaders.h
@@ -53,7 +53,8 @@ enum PacketType {
     PacketTypeParticleErase,
     PacketTypeParticleAddResponse,
     PacketTypeMetavoxelData,
-    PacketTypeAvatarIdentity
+    PacketTypeAvatarIdentity,
+    PacketTypeAvatarBillboard
 };
 
 typedef char PacketVersion;