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Release 1.8.1

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# Cemu detailed changelog for 1.8.1b
# Patreon release date: 2017-06-23
# Public release date:  2017-06-30

# New in 1.8.1b:

general: Fixed a bug causing permanent full CPU load on one thread

# New in 1.8.1:

CPU/JIT: Fixed a bug in ADDME. instruction
CPU/Interpreter: Fixed a bug in PSQ_STX and PSQ_LDX instruction (GQR index parsed incorrectly from opcode)
CPU/Interpreter: Fixed invalid endianness in instruction STHBRX

coreinit: Added 'errno' export
coreinit: Added API OSCalendarTimeToTicks(), OSCancelThread(), IM_GetHomeButtonParams(), OSCalendarTimeToTicks(), FSAppendFile(), FSRemove(), SAVEChangeDir()
coreinit: Fixed GHS flock handling. Added __ghs_flock_file() and __ghs_funlock_file()
coreinit: Added support for milliseconds and microseconds in OSTicksToCalendarTime()
coreinit: Fixed bug where FSOpenFile() with mode 'r+' would not allow read access
coreinit: Fixed a bug where shared-write file access prevented simultaneous read access from the same file

GX2: Added API GX2GetScissorReg(), GX2GetTargetChannelMasksReg(), GX2SetDefaultState()
GX2: Better handling for invalid/uncompilable shaders (avoid drawcalls that will lead to errors)
GX2: Added support for vertex format 32_32_32_32_FLOAT for primitive RECTS
GX2: MULADD shader instruction will now use correct rules in regards to 0*anything
GX2: Fixed OpenGL error caused by games requesting more mip levels than possible for a texture
GX2: Fixed source mip level parameter for GX2CopySurface()
GX2: Avoid shadow samplers on AMD GPUs. This workaround can be forced on other GPUs via -amdshadows command line parameter

SWKBD: Fixed handling of active state (previously it was tied to the keyboard being visible whereas it should be separate)
SWKBD: Fixed input handling (should no longer clash with wxWidgets, leading to input sometimes being ignored)

RPL: Fixed bug where imports/exports were mapped incorrectly if the internal module name included '.rpl'

zlib: Overhauled Cafe OS zLib implementation

nsysnet: Added nsysnet (socket) library