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gsdx: add Castlevania hack explanation

This commit is contained in:
Gregory Hainaut 2015-05-26 17:03:13 +02:00
parent 419dfe0544
commit c43ddaec4f
1 changed files with 12 additions and 0 deletions
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12
plugins/GSdx/GSState.cpp
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@ -4314,6 +4314,18 @@ bool GSC_Castlevania(const GSFrameInfo& fi, int& skip)
{
if(skip == 0)
{
// This hack removes the shadows and globally darker image
// I think there are 2 issues on GSdx
//
// 1/ potential not correctly supported colclip.
//
// 2/ use of a 32 bits format to emulate a 16 bit formats
// For example, if you blend 64 time the value 4 on a dark destination pixels
//
// FMT32: 4*64 = 256 <= white pixels
//
// FMT16: output of blending will always be 0 because the 3 lsb of color is dropped.
// Therefore the pixel remains dark !!!
if(fi.TME && fi.FBP == 0 && fi.TBP0 && fi.TPSM == 10 && fi.FBMSK == 0xFFFFFF)
{
skip = 2;