From c4fbb545a67635f58a7163bf01500f763e25df36 Mon Sep 17 00:00:00 2001
From: Simei Yin
Date: Wed, 2 Aug 2017 09:15:40 +0200
Subject: SLUDGE: Reset zBuffers when blank back drop

---
 engines/sludge/backdrop.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'engines')

diff --git a/engines/sludge/backdrop.cpp b/engines/sludge/backdrop.cpp
index 9bc2a56be7..701f5dbaac 100644
--- a/engines/sludge/backdrop.cpp
+++ b/engines/sludge/backdrop.cpp
@@ -300,6 +300,11 @@ void GraphicsManager::blankScreen(int x1, int y1, int x2, int y2) {
 		y2 = (int)_sceneHeight;
 
 	_backdropSurface.fillRect(Common::Rect(x1, y1, x2, y2), _currentBlankColour);
+
+	// reset zBuffer
+	if (_zBuffer->originalNum >= 0) {
+		setZBuffer(_zBuffer->originalNum);
+	}
 }
 
 void GraphicsManager::blankAllScreen() {
@@ -345,6 +350,11 @@ void GraphicsManager::drawHorizontalLine(uint x1, uint y, uint x2) {
 void GraphicsManager::darkScreen() {
 	Graphics::TransparentSurface tmp(_backdropSurface, false);
 	tmp.blit(_backdropSurface, 0, 0, Graphics::FLIP_NONE, nullptr, TS_ARGB(0, 255 >> 1, 0, 0));
+
+	// reset zBuffer
+	if (_zBuffer->originalNum >= 0) {
+		setZBuffer(_zBuffer->originalNum);
+	}
 }
 
 void GraphicsManager::drawBackDrop() {
-- 
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