From 7ea488a3c9149b996d48c1fb7b5a5c4552a10361 Mon Sep 17 00:00:00 2001
From: StapleButter <thetotalworm@gmail.com>
Date: Mon, 24 Apr 2017 16:01:24 +0200
Subject: [PATCH] support 8-bit writes to the color effect registers

---
 src/GPU2D.cpp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/GPU2D.cpp b/src/GPU2D.cpp
index d92d9609..2ff94135 100644
--- a/src/GPU2D.cpp
+++ b/src/GPU2D.cpp
@@ -198,6 +198,21 @@ void GPU2D::Write8(u32 addr, u8 val)
     case 0x049: WinCnt[1] = val; return;
     case 0x04A: WinCnt[2] = val; return;
     case 0x04B: WinCnt[3] = val; return;
+
+    case 0x050: BlendCnt = (BlendCnt & 0xFF00) | val; return;
+    case 0x051: BlendCnt = (BlendCnt & 0x00FF) | (val << 8); return;
+    case 0x052:
+        EVA = val & 0x1F;
+        if (EVA > 16) EVA = 16;
+        return;
+    case 0x53:
+        EVB = val & 0x1F;
+        if (EVB > 16) EVB = 16;
+        return;
+    case 0x054:
+        EVY = val & 0x1F;
+        if (EVY > 16) EVY = 16;
+        return;
     }
 
     printf("unknown GPU write8 %08X %02X\n", addr, val);