mdec.cpp: Dare to set MDEC_BIAS to 10 (#186)

This fixes graphic artifacts during cinematics in :
- Vandal Hearts
- R-Types
- Galerians

Dmitrysmagin had a similar fix in PCSX4ALL but he set it to 6.
It turns out MDEC_BIAS set to 6 was still not enough for Galerians
to look properly so it was set to 10.
It seems so far that other games are unaffected.

Co-authored-by: Dmitry Smagin <exmortis@yandex.ru>

diff --git a/libpcsxcore/mdec.c b/libpcsxcore/mdec.c
index d6c7ab6..61ed5ea 100644 (file)
--- a/libpcsxcore/mdec.c
+++ b/libpcsxcore/mdec.c
@@ -32,7 +32,14 @@
  * 320x240x16@60Hz => 9.216 MB/s
  * so 2.0 to 4.0 should be fine.
  */
-#define MDEC_BIAS 2
+ 
+/* Was set to 2 before but it would cause issues in R-types and Vandal Hearts videos. 
+ * Setting it to 6 as dmitrysmagin did fix those... except for Galerians.
+ * Galerians needs this to be set to 10 (!!) before it looks properly.
+ * I've tried this with a few other games (including R-Types) and so far, this
+ * has not backfired.
+ * */
+#define MDEC_BIAS 10
 
 #define DSIZE                  8
 #define DSIZE2                 (DSIZE * DSIZE)