From c2f7cdbb7ccc249ea9012f0c1e9fa46628dc8077 Mon Sep 17 00:00:00 2001
From: Eric Wasylishen <ewasylishen@gmail.com>
Date: Sat, 20 May 2023 23:09:42 -0600
Subject: [PATCH] lightpreview: clear data before reloading

---
 lightpreview/glview.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lightpreview/glview.cpp b/lightpreview/glview.cpp
index d5a7ed0d..be760ec3 100644
--- a/lightpreview/glview.cpp
+++ b/lightpreview/glview.cpp
@@ -63,6 +63,9 @@ GLView::~GLView()
     m_indexBuffer.destroy();
     m_vao.destroy();
 
+    lightmap_texture.reset();
+    m_drawcalls.clear();
+
     doneCurrent();
 }
 
@@ -180,6 +183,12 @@ void GLView::renderBSP(const mbsp_t &bsp)
     // we can only do this after `initializeGL()` has run once.
     makeCurrent();
 
+    // clear old data
+    lightmap_texture.reset();
+    m_drawcalls.clear();
+    m_vbo.allocate(0);
+    m_indexBuffer.allocate(0);
+    
     // upload lightmap atlas
     {
         const auto &lm_tex = atlas.style_to_lightmap_atlas.at(0);