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Backport https://github.com/flyinghead/flycast/commit/e99aac357567302e1d1daf4b59ec8e4139c879da#diff-7194c04007dd96b8c496118886760725f8eb7b8bda6916d63bf6e3ea967e44a7

Backport https://github.com/flyinghead/flycast/commit/1b04ef4cb11b286e7487683a8283512976579cb5#diff-3d7848c6ecc65ba29b69f95369a18a93d26feb5786259415bcc94f569b5b819c

Renderer_if.h, remove all the stray function prototypes

This reverts commit 5d88798a.

(SH4) backport https://github.com/flyinghead/flycast/commit/333df13fce8a0bc577d6397c384abf86ea5daf24

(SH4) backport https://github.com/flyinghead/flycast/commit/a19c73de7b79b6c504798768a32922994f52c57f
sync soft/hard reset calls with upstream

Backport https://github.com/flyinghead/flycast/commit/ec95c95b89178c9090c14b2f78c26a563593bef6

Backport https://github.com/flyinghead/flycast/commit/d524e3381d72b5b8d3c2c36863718e38b8b0ff51

Backport https://github.com/flyinghead/flycast/commit/b82a97853fd87607b51ca3b270b261f7d4c5aac0

pixel buffer size at 2GB or 4GB - we can allocate 2GB by changing
size to 0x7ff00000u for now

Issue #922

add emulator.h

Don't rely on having a lightgun controller at boot for hotd2 and others
make sure naomi VMU controller don't report inputs
Fix wrungp drive board error
JVS config for Guilty Gear, Maze of the King, Confidential Mission

fix input descriptor L2/R2 mixup

Issue #835

Issue #817

Use file extension to select the right disc driver
Better error reporting, less memory leaks and crashes on invalid content
Force HLE off when booting BIOS
Don't crash if missing BIOS file

may lead to vmu corruption otherwise
don't create vmu files when running naomi or atomiswave games

might help
Issue #790
Issue #755
Issue #693

Delete renderer when destroying context
if vkGetPhysicalDeviceFormatProperties2 is null, use
vkGetPhysicalDeviceFormatProperties instead

Also force vulkan 1.1 for now

setImageLayout was missing TransferSrcOptimal as source layout
Vulkan needs the first vertex to be the provoking vertex so copy 3rd on
1st when flat shading.
VRAM stride was incorrect (RTT to VRAM)

Add 4GB pixel buffer size option

100s might be overkill, 20s seems fair

Widescreen cheats need to render to 4:3 internal res, displayed as 16:9.
Widescreen hack enlarge the internal res width from 4:3 to 16:9