From 96860b88e041d5230f6823e201d913e535f4d415 Mon Sep 17 00:00:00 2001
From: rdb <git@rdb.name>
Date: Mon, 8 Oct 2018 22:11:55 +0200
Subject: [PATCH] dxgsg9: fix problems with window without depth buffer

---
 panda/src/dxgsg9/dxGraphicsStateGuardian9.cxx | 4 ++--
 panda/src/dxgsg9/wdxGraphicsWindow9.cxx       | 5 ++++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/panda/src/dxgsg9/dxGraphicsStateGuardian9.cxx b/panda/src/dxgsg9/dxGraphicsStateGuardian9.cxx
index b18c937d81..904f47afc3 100644
--- a/panda/src/dxgsg9/dxGraphicsStateGuardian9.cxx
+++ b/panda/src/dxgsg9/dxGraphicsStateGuardian9.cxx
@@ -799,9 +799,9 @@ clear(DrawableRegion *clearable) {
     main_flags |=  D3DCLEAR_TARGET;
   }
 
-  if (clearable->get_clear_depth_active()) {
+  if (clearable->get_clear_depth_active() &&
+      _screen->_presentation_params.EnableAutoDepthStencil) {
     aux_flags |=  D3DCLEAR_ZBUFFER;
-    nassertv(_screen->_presentation_params.EnableAutoDepthStencil);
   }
 
   if (clearable->get_clear_stencil_active()) {
diff --git a/panda/src/dxgsg9/wdxGraphicsWindow9.cxx b/panda/src/dxgsg9/wdxGraphicsWindow9.cxx
index 3136d75fd0..3207c81189 100644
--- a/panda/src/dxgsg9/wdxGraphicsWindow9.cxx
+++ b/panda/src/dxgsg9/wdxGraphicsWindow9.cxx
@@ -1229,7 +1229,10 @@ init_resized_window() {
   DWORD flags;
   D3DCOLOR clear_color;
 
-  flags = D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER;
+  flags = D3DCLEAR_TARGET;
+  if (_fb_properties.get_depth_bits() > 0) {
+    flags |= D3DCLEAR_ZBUFFER;
+  }
   clear_color = 0x00000000;
   hr = _wcontext._d3d_device-> Clear (0, nullptr, flags, clear_color, 0.0f, 0);
   if (FAILED(hr)) {