Abstract event processing code to be able to use any other library for this purpose

[ihhub]

!!!ATTENTION!!! This change is massive and touches every platform we support. In-depth testing is required for each platform to verify that all inputs (keyboard, mouse, touchscreen, gamepad buttons) still work correctly. !!!ATTENTION!!!

This pull request abstracts our current SDL2 event handling library from the rest of the code. It is needed to avoid extra dependency from SDL and in the future flawlessly move to SDL 3 or any other library for event handling. Also, LocalEvent class was such a mess so it is hard to maintain it and understand what's going on inside.

Changes made:

• move all SDL related code out of localevent.h file, only localevent.cpp file uses SDL-related headers
• sort functions in LocalEvent class: group static functions and non-static, also move a bit variables
• introduce EventProcessing::EventEngine class which handles all SDL-related logic, while the event logic still resides in LocalEvent class

The biggest mess in the code was regarding Vita and Switch button mapping. Here how it was:

SDL button	Value	Switch mapping	Action
Switch
SDL_CONTROLLER_BUTTON_A	0	SWITCH_BUTTON_B	mouse right
SDL_CONTROLLER_BUTTON_B	1	SWITCH_BUTTON_A	mouse left
SDL_CONTROLLER_BUTTON_X	2	SWITCH_BUTTON_Y	KEY_ENTER
SDL_CONTROLLER_BUTTON_Y	3	SWITCH_BUTTON_X	KEY_ESCAPE
SDL_CONTROLLER_BUTTON_BACK	4	SWITCH_BUTTON_MINUS	KEY_E
SDL_CONTROLLER_BUTTON_GUIDE	5
SDL_CONTROLLER_BUTTON_START	6	SWITCH_BUTTON_PLUS	KEY_C
SDL_CONTROLLER_BUTTON_LEFTSTICK	7
SDL_CONTROLLER_BUTTON_RIGHTSTICK	8
SDL_CONTROLLER_BUTTON_LEFTSHOULDER	9	SWITCH_BUTTON_L	KEY_H
SDL_CONTROLLER_BUTTON_RIGHTSHOULDER	10	SWITCH_BUTTON_R	KEY_T
SDL_CONTROLLER_BUTTON_DPAD_UP	11	11
SDL_CONTROLLER_BUTTON_DPAD_DOWN	12	12
SDL_CONTROLLER_BUTTON_DPAD_LEFT	13	13
SDL_CONTROLLER_BUTTON_DPAD_RIGHT	14	14
Vita
SDL_CONTROLLER_BUTTON_A	0		mouse left
SDL_CONTROLLER_BUTTON_B	1		mouse right
SDL_CONTROLLER_BUTTON_X	2		KEY_E
SDL_CONTROLLER_BUTTON_Y	3		KEY_C
SDL_CONTROLLER_BUTTON_BACK	4		KEY_F
SDL_CONTROLLER_BUTTON_GUIDE	5
SDL_CONTROLLER_BUTTON_START	6		KEY_ENTER
SDL_CONTROLLER_BUTTON_LEFTSTICK	7
SDL_CONTROLLER_BUTTON_RIGHTSTICK	8
SDL_CONTROLLER_BUTTON_LEFTSHOULDER	9
SDL_CONTROLLER_BUTTON_RIGHTSHOULDER	10
SDL_CONTROLLER_BUTTON_DPAD_UP	11
SDL_CONTROLLER_BUTTON_DPAD_DOWN	12		KEY_SPACE
SDL_CONTROLLER_BUTTON_DPAD_LEFT	13		KEY_H
SDL_CONTROLLER_BUTTON_DPAD_RIGHT	14		KEY_T

The only key was not present in Vita is KEY_ESCAPE which I use for CONTROLLER_BUTTON_GUIDE.

Things to do after this pull request:

• make proper button mapping for controllers in other pull request
• rename make functions and variables as well as do code cleanup and sorting (it's still a mess but this PR is already too big)

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[ihhub]

A table of completed testing for each platform (will be updated upon testing):

Platform	Keyboard	Mouse	Touchscreen	Gamepad
Windows	+	+
Ubuntu	+	+
macOS	+	+
Android		+	+
Vita			+	+
Switch

[ihhub]

Hi @oleg-derevenetz , if you don't mind can you please test macOS build for at least keyboard and mouse?

[ihhub]

Hi @Northfear , can you please check Vita build that these changes don't break input controls?

Hi @dimag0g , can you please do the same for Switch build?

[oleg-derevenetz]

Hi @ihhub

if you don't mind can you please test macOS build for at least keyboard and mouse?

Sure, just checked this PR on macOS, no issues with the keyboard or mouse were found.

[Northfear]

@ihhub I did a quick test and everything seems to be working fine on Vita

[ihhub]

Thank you, @oleg-derevenetz and @Northfear !