From 73a7d1b63b41ffddeaaab29f89f4c0653e3d5531 Mon Sep 17 00:00:00 2001
From: Brad Hefta-Gaub <brad@highfidelity.io>
Date: Tue, 20 Sep 2016 10:15:27 -0700
Subject: [PATCH] redraw no-preview message if window size changes

---
 .../src/display-plugins/hmd/HmdDisplayPlugin.cpp   | 14 ++++++++++++++
 .../src/display-plugins/hmd/HmdDisplayPlugin.h     |  1 +
 2 files changed, 15 insertions(+)

diff --git a/libraries/display-plugins/src/display-plugins/hmd/HmdDisplayPlugin.cpp b/libraries/display-plugins/src/display-plugins/hmd/HmdDisplayPlugin.cpp
index b0d7d9e3cf..a02600d971 100644
--- a/libraries/display-plugins/src/display-plugins/hmd/HmdDisplayPlugin.cpp
+++ b/libraries/display-plugins/src/display-plugins/hmd/HmdDisplayPlugin.cpp
@@ -249,6 +249,9 @@ void HmdDisplayPlugin::internalPresent() {
         
         if (getGLBackend()->isTextureReady(_previewTexture)) {
             auto viewport = getViewportForSourceSize(uvec2(_previewTexture->getDimensions()));
+
+            qDebug() << "viewport:" << viewport.x << "," << viewport.y << "," << viewport.z << "," << viewport.w;
+
             render([&](gpu::Batch& batch) {
                 batch.enableStereo(false);
                 batch.resetViewTransform();
@@ -265,6 +268,17 @@ void HmdDisplayPlugin::internalPresent() {
         }
     }
     postPreview();
+
+    // If preview is disabled, we need to check to see if the window size has changed 
+    // and re-render the no-preview message
+    if (_disablePreview) {
+        auto window = _container->getPrimaryWidget();
+        glm::vec2 windowSize = toGlm(window->size());
+        if (windowSize != _lastWindowSize) {
+            _clearPreviewFlag = true;
+            _lastWindowSize = windowSize;
+        }
+    }
 }
 
 // HMD specific stuff
diff --git a/libraries/display-plugins/src/display-plugins/hmd/HmdDisplayPlugin.h b/libraries/display-plugins/src/display-plugins/hmd/HmdDisplayPlugin.h
index 1c10706453..08db3d7993 100644
--- a/libraries/display-plugins/src/display-plugins/hmd/HmdDisplayPlugin.h
+++ b/libraries/display-plugins/src/display-plugins/hmd/HmdDisplayPlugin.h
@@ -108,6 +108,7 @@ private:
     bool _monoPreview { true };
     bool _clearPreviewFlag { false };
     gpu::TexturePointer _previewTexture;
+    glm::vec2 _lastWindowSize;
 
     struct OverlayRenderer {
         gpu::Stream::FormatPointer format;