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gsdx hack: add a lengthy comment to explain man hunt2 hack 

An HLE shader replacement could be done for this game but it is
low priority
This commit is contained in:
Gregory Hainaut 2016-05-01 13:37:54 +02:00
parent 4bf484c881
commit 7add3d1018
1 changed files with 18 additions and 0 deletions
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18
plugins/GSdx/GSHwHack.cpp
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@ -154,6 +154,24 @@ bool GSC_WildArms5(const GSFrameInfo& fi, int& skip)
bool GSC_Manhunt2(const GSFrameInfo& fi, int& skip)
{
/*
* The game readback RT as 8 bits index texture to apply a non-linear brightness/gamma correction on all channel
* It could be written in HLE shader as:
* out = blue_lut[in.blue] + green_lut[in.green] + blue_lut[in.blue]
*
* Unlike others games (which do all pages of a channel), man hunt apply the 3 channel corrections by page.
* (in short it is loop index/loop page instead of loop page/loop index)
*
* It is very annoying to detect.So in order to fix the effect the best
* solution will be to implement an alternate draw call and then skip the
* useless gs draw call.
*
* Blue Palette correction is located @ 0x3C08 (TEX0.CBP of the first draw call that will fire the effect)
* Green Palette correction is located @ 0x3C04
* Blue Palette correction is located @ 0x3C00
* Either we upload the data as a new texture or we could hardcode them in a shader
*
*/
if(skip == 0)
{
if(fi.TME && fi.FBP == 0x03c20 && fi.FPSM == PSM_PSMCT32 && fi.TBP0 == 0x01400 && fi.TPSM == PSM_PSMT8)