piwalker/dolphin
1
0
Fork 0
mirror of https://github.com/dolphin-emu/dolphin.git synced 2025-07-24 14:49:42 -06:00
Code Issues Packages Projects Releases Wiki Activity

Works around broken Intel Windows video drivers.

Browse Source 
Just use regular boolean negation in our pixel shader's depth test everywhere except on Qualcomm.
This works around a bug in the Intel Windows driver where comparing a boolean value against true or false fails but boolean negation works fine.
Quite silly.

Should fix issues #7830 and #7899.
This commit is contained in:
Ryan Houdek
2014-12-03 00:29:50 -06:00
parent 22209bcc62
commit 5c3bbf7409
3 changed files with 36 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
Source/Core/VideoCommon/DriverDetails.h
View File

@ -178,6 +178,31 @@ namespace DriverDetails
// This was fixed in a v66 development version, the first shipping driver version with the release was v95.
// To be safe, make v95 the minimum version to work around this issue
BUG_BROKENATTRIBUTELESS,
// Bug: Qualcomm has broken boolean negation
// Affected devices: Adreno
// Started Version: -1
// Ended Version: -1
// Qualcomm has the boolean negation broken in their shader compiler
// Instead of inverting the boolean value it does a binary negation on the full 32bit register
// This causes a compare against zero to fail in their shader since it is no longer a 0 or 1 value
// but 0xFFFFFFFF or 0xFFFFFFFE depending on what the boolean value was before the negation.
//
// This bug has a secondary issue tied to it unlike other bugs.
// The correction of this bug is to check the boolean value against false which results in us
// not doing a negation of the source but instead checking against the boolean value we want.
// The issue with this is that Intel's Window driver is broken when checking if a boolean value is
// equal to true or false, so one has to do a boolean negation of the source
//
// eg.
// Broken on Qualcomm
// Works on Windows Intel
// if (!cond)
//
// Works on Qualcomm
// Broken on Windows Intel
// if (cond == false)
BUG_BROKENNEGATEDBOOLEAN,
};
// Initializes our internal vendor, device family, and driver version