From 64054c167f5c2b90d64cf74412fee3236548dbbd Mon Sep 17 00:00:00 2001
From: hap <happppp@users.noreply.github.com>
Date: Tue, 20 Dec 2022 23:19:44 +0100
Subject: subroc3d: add internal artwork 3d scope views

---
 src/mame/layout/buckrog.lay  |  2 +-
 src/mame/layout/subroc3d.lay | 44 +++++++++++++++++++++++++++++++++++++++++++-
 src/mame/layout/turbo.lay    |  2 +-
 src/mame/sega/turbo.cpp      | 12 ++++++++----
 4 files changed, 53 insertions(+), 7 deletions(-)

diff --git a/src/mame/layout/buckrog.lay b/src/mame/layout/buckrog.lay
index 862fa683e17..cabf33a8c73 100644
--- a/src/mame/layout/buckrog.lay
+++ b/src/mame/layout/buckrog.lay
@@ -3,7 +3,7 @@
 license:CC0
 -->
 <mamelayout version="2">
-	<element name="digit" defstate="10">
+	<element name="digit" defstate="0">
 		<led7seg>
 			<color red="1.0" green="0.3" blue="0.0" />
 		</led7seg>
diff --git a/src/mame/layout/subroc3d.lay b/src/mame/layout/subroc3d.lay
index a91227ae093..5d0bd5f2f09 100644
--- a/src/mame/layout/subroc3d.lay
+++ b/src/mame/layout/subroc3d.lay
@@ -3,12 +3,25 @@
 license:CC0
 -->
 <mamelayout version="2">
-	<element name="digit" defstate="10">
+
+<!-- define elements -->
+
+	<element name="digit" defstate="0">
 		<led7seg>
 			<color red="1.0" green="0.3" blue="0.0" />
 		</led7seg>
 	</element>
 
+	<element name="shutter1" defstate="0">
+		<rect state="0"><color red="0" green="0" blue="0" /></rect>
+	</element>
+	<element name="shutter2" defstate="0">
+		<rect state="1"><color red="0" green="0" blue="0" /></rect>
+	</element>
+
+
+<!-- build screen -->
+
 	<view name="Simple LEDs">
 		<bounds left="0" top="-0.472" right="4" bottom="3" />
 
@@ -92,4 +105,33 @@ license:CC0
 			<bounds left="3.770" top="-0.306" right="3.870" bottom="-0.136" />
 		</element>
 	</view>
+
+	<view name="3D Scope Straight View">
+		<!-- parallel-eyed -->
+		<screen index="0"><bounds left="0" top="0" right="4" bottom="3" /></screen>
+		<element name="shutter" ref="shutter1"><bounds left="0" top="0" right="4" bottom="3" /></element>
+
+		<screen index="0"><bounds left="4.03" top="0" right="8.03" bottom="3" /></screen>
+		<element name="shutter" ref="shutter2"><bounds left="4.03" top="0" right="8.03" bottom="3" /></element>
+	</view>
+
+	<view name="3D Scope Cross View">
+		<!-- cross-eyed -->
+		<screen index="0"><bounds left="0" top="0" right="4" bottom="3" /></screen>
+		<element name="shutter" ref="shutter2"><bounds left="0" top="0" right="4" bottom="3" /></element>
+
+		<screen index="0"><bounds left="4.03" top="0" right="8.03" bottom="3" /></screen>
+		<element name="shutter" ref="shutter1"><bounds left="4.03" top="0" right="8.03" bottom="3" /></element>
+	</view>
+
+	<view name="3D Scope Left">
+		<screen index="0"><bounds left="0" top="0" right="4" bottom="3" /></screen>
+		<element name="shutter" ref="shutter1"><bounds left="0" top="0" right="4" bottom="3" /></element>
+	</view>
+
+	<view name="3D Scope Right">
+		<screen index="0"><bounds left="0" top="0" right="4" bottom="3" /></screen>
+		<element name="shutter" ref="shutter2"><bounds left="0" top="0" right="4" bottom="3" /></element>
+	</view>
+
 </mamelayout>
diff --git a/src/mame/layout/turbo.lay b/src/mame/layout/turbo.lay
index 3af07772b40..7dcb015db31 100644
--- a/src/mame/layout/turbo.lay
+++ b/src/mame/layout/turbo.lay
@@ -3,7 +3,7 @@
 license:CC0
 -->
 <mamelayout version="2">
-	<element name="digit" defstate="10">
+	<element name="digit" defstate="0">
 		<led7seg>
 			<color red="1.0" green="0.3" blue="0.0" />
 		</led7seg>
diff --git a/src/mame/sega/turbo.cpp b/src/mame/sega/turbo.cpp
index 95e98d432a7..1362a0c32de 100644
--- a/src/mame/sega/turbo.cpp
+++ b/src/mame/sega/turbo.cpp
@@ -8,9 +8,12 @@
     and Aaron Giles
 
     Games supported:
-        * Turbo
-        * Subroc 3D
-        * Buck Rogers: Planet of Zoom
+    - Turbo
+    - Subroc 3D
+    - Buck Rogers: Planet of Zoom
+
+    BTANB:
+    - subroc3d 'seafoam' appears as black spots on top of some sprites
 
 **************************************************************************
     TURBO
@@ -357,7 +360,8 @@ void subroc3d_state::ppi0b_w(uint8_t data)
 	m_lamp = BIT(data, 2);
 	m_flip = BIT(data, 4);
 
-	// flip also goes to 3D scope shutter (motor to rotating disc)
+	// flip also goes to 3D scope shutter sync
+	// (it's a motor to 2 rotating discs, half painted black)
 	m_shutter = BIT(data, 4);
 }
 
-- 
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