From c4af4c7b101735e1f9e78b9e8a4c004ba5f5607a Mon Sep 17 00:00:00 2001
From: Brad Hefta-Gaub <brad@highfidelity.io>
Date: Tue, 13 Oct 2015 17:45:29 -0700
Subject: [PATCH] basic mono preview for the oculus display plugin

---
 .../oculus/OculusDisplayPlugin.cpp            | 30 +++++++++++++++----
 .../oculus/OculusDisplayPlugin.h              |  4 ++-
 .../stereo/StereoDisplayPlugin.cpp            |  5 ++++
 3 files changed, 33 insertions(+), 6 deletions(-)

diff --git a/libraries/display-plugins/src/display-plugins/oculus/OculusDisplayPlugin.cpp b/libraries/display-plugins/src/display-plugins/oculus/OculusDisplayPlugin.cpp
index 58675eab4d..3e2290f104 100644
--- a/libraries/display-plugins/src/display-plugins/oculus/OculusDisplayPlugin.cpp
+++ b/libraries/display-plugins/src/display-plugins/oculus/OculusDisplayPlugin.cpp
@@ -11,6 +11,8 @@
 
 #include "OculusHelpers.h"
 
+#include <plugins/PluginContainer.h>
+
 #if (OVR_MAJOR_VERSION >= 6)
 
 // A base class for FBO wrappers that need to use the Oculus C
@@ -135,6 +137,19 @@ const QString & OculusDisplayPlugin::getName() const {
     return NAME;
 }
 
+static const QString MONO_PREVIEW = "Mono Preview";
+static const QString FRAMERATE = DisplayPlugin::MENU_PATH() + ">Framerate";
+
+void OculusDisplayPlugin::activate() {
+
+    CONTAINER->addMenuItem(MENU_PATH(), MONO_PREVIEW,
+        [this](bool clicked) {
+            _monoPreview = clicked;
+        }, true, true);
+    CONTAINER->removeMenu(FRAMERATE);
+    OculusBaseDisplayPlugin::activate();
+}
+
 void OculusDisplayPlugin::customizeContext() {
     WindowOpenGLDisplayPlugin::customizeContext();
 #if (OVR_MAJOR_VERSION >= 6)
@@ -149,7 +164,7 @@ void OculusDisplayPlugin::customizeContext() {
 #endif
     enableVsync(false);
     // Only enable mirroring if we know vsync is disabled
-    _enableMirror = !isVsyncEnabled();
+    _enablePreview = !isVsyncEnabled();
 }
 
 void OculusDisplayPlugin::deactivate() {
@@ -169,10 +184,15 @@ void OculusDisplayPlugin::display(GLuint finalTexture, const glm::uvec2& sceneSi
     // controlling vsync
     wglSwapIntervalEXT(0);
 
-    // screen mirroring
-    if (_enableMirror) {
+    // screen preview mirroring
+    if (_enablePreview) {
         auto windowSize = toGlm(_window->size());
-        Context::Viewport(windowSize.x, windowSize.y);
+        if (_monoPreview) {
+            Context::Viewport(windowSize.x * 2, windowSize.y);
+            Context::Scissor(0, windowSize.y, windowSize.x, windowSize.y);
+        } else {
+            Context::Viewport(windowSize.x, windowSize.y);
+        }
         glBindTexture(GL_TEXTURE_2D, finalTexture);
         GLenum err = glGetError();
         Q_ASSERT(0 == err);
@@ -216,7 +236,7 @@ void OculusDisplayPlugin::display(GLuint finalTexture, const glm::uvec2& sceneSi
     otherwise the swapbuffer delay will interefere with the framerate of the headset
 */
 void OculusDisplayPlugin::finishFrame() {
-    if (_enableMirror) {
+    if (_enablePreview) {
         swapBuffers();
     }
     doneCurrent();
diff --git a/libraries/display-plugins/src/display-plugins/oculus/OculusDisplayPlugin.h b/libraries/display-plugins/src/display-plugins/oculus/OculusDisplayPlugin.h
index 7db83884cd..c1224ecf3a 100644
--- a/libraries/display-plugins/src/display-plugins/oculus/OculusDisplayPlugin.h
+++ b/libraries/display-plugins/src/display-plugins/oculus/OculusDisplayPlugin.h
@@ -14,6 +14,7 @@ using SwapFboPtr = QSharedPointer<SwapFramebufferWrapper>;
 
 class OculusDisplayPlugin : public OculusBaseDisplayPlugin {
 public:
+    virtual void activate() override;
     virtual void deactivate() override;
     virtual const QString & getName() const override;
 
@@ -25,7 +26,8 @@ protected:
 
 private:
     static const QString NAME;
-    bool _enableMirror{ false };
+    bool _enablePreview { false };
+    bool _monoPreview { true };
 
 #if (OVR_MAJOR_VERSION >= 6)
     SwapFboPtr       _sceneFbo;
diff --git a/libraries/display-plugins/src/display-plugins/stereo/StereoDisplayPlugin.cpp b/libraries/display-plugins/src/display-plugins/stereo/StereoDisplayPlugin.cpp
index 2ea79ed2e0..4f7b0a1a78 100644
--- a/libraries/display-plugins/src/display-plugins/stereo/StereoDisplayPlugin.cpp
+++ b/libraries/display-plugins/src/display-plugins/stereo/StereoDisplayPlugin.cpp
@@ -61,6 +61,8 @@ glm::mat4 StereoDisplayPlugin::getProjection(Eye eye, const glm::mat4& baseProje
     return eyeProjection;
 }
 
+static const QString FRAMERATE = DisplayPlugin::MENU_PATH() + ">Framerate";
+
 std::vector<QAction*> _screenActions;
 void StereoDisplayPlugin::activate() {
     auto screens = qApp->screens();
@@ -76,6 +78,9 @@ void StereoDisplayPlugin::activate() {
             [this](bool clicked) { updateScreen(); }, true, checked, "Screens");
         _screenActions[i] = action;
     }
+
+    CONTAINER->removeMenu(FRAMERATE);
+
     CONTAINER->setFullscreen(qApp->primaryScreen());
     WindowOpenGLDisplayPlugin::activate();
 }