## Link to GitHub Issue or related Pull Request, if one exists
#676#452
## Description of change
When spice SDK or API sets or clears button and analog override, we
don't tell MDXF about it, so it may fall behind. This is a special case
for DDR MDXF I/O emulation. For Naive/Xinput I think we are getting
lucky because they usually also generate WM_INPUT events.
Update the C++ SDK sample to provide more interesting example of
emulating DDR arrows with the keyboard.
## Testing
## Link to GitHub Issue or related Pull Request, if one exists
n/a
## Description of change
Adds a flat-C, headers-only library for writing DLL plugins with spice.
This is meant to be an alternative to writing applications over spice
API which doesn't suit some scenarios like writing custom
high-performance I/O modules.
All you have to do is:
1. Create a 32-bit or 64-bit DLL with `spice_sdk_entry_point` as a
DLLExport
1. Include `spicesdk.h`, and optionally `spicesdk_io.h` (see
`extras\sdk\include`)
1. `spice_sdk_entry_point` will be called when hooks get initialized.
Call `init` with valid parameters.
1. When `init` returns, `SPICE_SDK_V0` will be filled out with a series
of function pointers; your DLL can now start calling into it.
1. Compile your DLL and add it as a DLL hook (`-k`) in spice when
launching the game.
See `v0_cpp.cpp` for an example.
V0 implements the following functions:
```
log;
get_game_info;
get_avs_info;
get_button;
set_button;
get_analog;
set_analog;
get_light;
set_light;
set_touch;
clear_touch;
insert_card;
set_keypad;
```
V0 is focused on providing common utility functions needed in a lot of
DLL hooks (get AVS info, log messages to file), and implementing I/O.
In the future, we could have more interesting things like:
* scanning and modifying memory
* installing DLL hooks
* having direct hooks into I/O emulation modules
* getting full tape LEDs
* having a callback into DX9 `Present` call
* drawing an ImGui window
More detailed documentation is coming soon in form of a wiki page.
## Testing
See included sample DLL.
bicarusandGitHub