From 3f8befaf4ef68375007dafba0e0859423d19c7ef Mon Sep 17 00:00:00 2001
From: StapleButter <thetotalworm@gmail.com>
Date: Sat, 24 Nov 2018 21:10:26 +0100
Subject: add support for forced-blank. fixing spurious colors during screen
 transitions in Picross 3D.

I thought I had already fixed that, but it was stuck in the long-dead jit branch, so, here it is, back from the dead.
---
 src/GPU2D.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'src')

diff --git a/src/GPU2D.cpp b/src/GPU2D.cpp
index 078374b..8a2eb19 100644
--- a/src/GPU2D.cpp
+++ b/src/GPU2D.cpp
@@ -538,6 +538,15 @@ void GPU2D::DrawScanline(u32 line)
         return;
     }
 
+    // forced blank
+    // (checkme: are there still things that can run under this mode? likely not)
+    if (DispCnt & (1<<7))
+    {
+        for (int i = 0; i < 256; i++)
+            dst[i] = 0xFFFFFFFF;
+        return;
+    }
+
     u32 dispmode = DispCnt >> 16;
     dispmode &= (Num ? 0x1 : 0x3);
 
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