From 8fef949f1ee759abc9c489f6d4bfdcd88c3c26bb Mon Sep 17 00:00:00 2001
From: Ville Linde <villedevs@gmail.com>
Date: Thu, 24 Jun 2021 19:06:21 +0300
Subject: [PATCH] fix Solar Assault title screen

---
 src/mame/drivers/gticlub.cpp |  5 ++++-
 src/mame/machine/konppc.cpp  | 13 +++++++++++++
 src/mame/machine/konppc.h    |  3 +++
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/mame/drivers/gticlub.cpp b/src/mame/drivers/gticlub.cpp
index 83bc7908d0a..3747b7084d4 100644
--- a/src/mame/drivers/gticlub.cpp
+++ b/src/mame/drivers/gticlub.cpp
@@ -764,7 +764,10 @@ uint32_t gticlub_state::screen_update_gticlub(screen_device &screen, bitmap_rgb3
 {
 	m_k001604[0]->draw_back_layer(screen, bitmap, cliprect);
 
-	m_k001005->draw(bitmap, cliprect);
+	if (m_konppc[0].output_3d_enabled())
+	{
+		m_k001005->draw(bitmap, cliprect);
+	}
 
 	m_k001604[0]->draw_front_layer(screen, bitmap, cliprect);
 
diff --git a/src/mame/machine/konppc.cpp b/src/mame/machine/konppc.cpp
index 49454224c98..ed76db1fed6 100644
--- a/src/mame/machine/konppc.cpp
+++ b/src/mame/machine/konppc.cpp
@@ -106,6 +106,14 @@ void konppc_device::set_cgboard_texture_bank(int board, const char *bank, uint8_
 	machine().root_device().membank(bank)->configure_entries(0, 2, rom, 0x800000);
 }
 
+bool konppc_device::output_3d_enabled()
+{
+	if (cgboard_id < MAX_CG_BOARDS)
+		return enable_3d[cgboard_id];
+	else
+		return false;
+}
+
 /*****************************************************************************/
 
 /* CG Board DSP interface for PowerPC */
@@ -155,6 +163,11 @@ void konppc_device::cgboard_dsp_comm_w_ppc(offs_t offset, uint32_t data, uint32_
 					dsp.set_input_line(INPUT_LINE_IRQ1, ASSERT_LINE);
 			}
 
+			if (ACCESSING_BITS_16_23)
+			{
+				enable_3d[cgboard_id] = (data & 0x400000) ? true : false;
+			}
+
 			if (ACCESSING_BITS_0_7)
 				dsp_comm_ppc[cgboard_id][offset] = data & 0xff;
 		}
diff --git a/src/mame/machine/konppc.h b/src/mame/machine/konppc.h
index f905057c503..c397a02bbd1 100644
--- a/src/mame/machine/konppc.h
+++ b/src/mame/machine/konppc.h
@@ -30,6 +30,7 @@ public:
 	int get_cgboard_id(void);
 	void set_cgboard_texture_bank(int board, const char *bank, uint8_t *rom);
 
+	bool output_3d_enabled();
 
 	// read/write
 	uint32_t cgboard_dsp_comm_r_ppc(offs_t offset, uint32_t mem_mask = ~0);
@@ -94,6 +95,8 @@ private:
 	int nwk_fifo_full;
 	int nwk_fifo_mask;
 
+	bool enable_3d[MAX_CG_BOARDS];
+
 	std::unique_ptr<uint32_t[]> nwk_fifo[MAX_CG_BOARDS];
 	int32_t nwk_fifo_read_ptr[MAX_CG_BOARDS];
 	int32_t nwk_fifo_write_ptr[MAX_CG_BOARDS];