From 64a7fbab873dedf8aaa6fb1993bc16ed12f0f0bd Mon Sep 17 00:00:00 2001
From: rdb <git@rdb.name>
Date: Fri, 10 Mar 2017 23:00:00 +0100
Subject: [PATCH] glgsg: fix assertion encountered when trying to use pointer
 textures Fixes LP 990089

---
 panda/src/gobj/texture.I | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/panda/src/gobj/texture.I b/panda/src/gobj/texture.I
index 47ce9e233f..29b1702280 100644
--- a/panda/src/gobj/texture.I
+++ b/panda/src/gobj/texture.I
@@ -1544,7 +1544,14 @@ INLINE size_t Texture::
 get_ram_mipmap_image_size(int n) const {
   CDReader cdata(_cycler);
   if (n >= 0 && n < (int)cdata->_ram_images.size()) {
-    return cdata->_ram_images[n]._image.size();
+    if (cdata->_ram_images[n]._pointer_image == nullptr) {
+      return cdata->_ram_images[n]._image.size();
+    } else {
+      // Calculate it based on the given page size.
+      return do_get_ram_mipmap_page_size(cdata, n) *
+             do_get_expected_mipmap_z_size(cdata, n) *
+             cdata->_num_views;
+    }
   }
   return 0;
 }