From 9ee81ad12718a355b210df838436dbd4f4384253 Mon Sep 17 00:00:00 2001
From: Simei Yin
Date: Fri, 18 Aug 2017 05:08:56 +0200
Subject: SLUDGE: Fix zBuffer problem when credit scrolling

---
 engines/sludge/sprites.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'engines/sludge')

diff --git a/engines/sludge/sprites.cpp b/engines/sludge/sprites.cpp
index 98d88a8337..c37c4a1905 100644
--- a/engines/sludge/sprites.cpp
+++ b/engines/sludge/sprites.cpp
@@ -271,6 +271,13 @@ bool GraphicsManager::loadSpriteBank(int fileNum, SpriteBank &loadhere, bool isF
 
 // pasteSpriteToBackDrop uses the colour specified by the setPasteColour (or setPasteColor)
 void GraphicsManager::pasteSpriteToBackDrop(int x1, int y1, Sprite &single, const SpritePalette &fontPal) {
+	// kill zBuffer
+	if (_zBuffer->originalNum >= 0 && _zBuffer->sprites) {
+		int num = _zBuffer->originalNum;
+		killZBuffer();
+		_zBuffer->originalNum = num;
+	}
+
 	//TODO: shader: useLightTexture
 	x1 -= single.xhot;
 	y1 -= single.yhot;
@@ -282,6 +289,13 @@ void GraphicsManager::pasteSpriteToBackDrop(int x1, int y1, Sprite &single, cons
 // burnSpriteToBackDrop adds text in the colour specified by setBurnColour
 // using the differing brightness levels of the font to achieve an anti-aliasing effect.
 void GraphicsManager::burnSpriteToBackDrop(int x1, int y1, Sprite &single, const SpritePalette &fontPal) {
+	// kill zBuffer
+	if (_zBuffer->originalNum >= 0 && _zBuffer->sprites) {
+		int num = _zBuffer->originalNum;
+		killZBuffer();
+		_zBuffer->originalNum = num;
+	}
+
 	//TODO: shader: useLightTexture
 	x1 -= single.xhot;
 	y1 -= single.yhot - 1;
-- 
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