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https://github.com/pumpitupdev/pumptools.git
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icex2
eafb2909d1
Use a similar code style to bemanitools though reduce indentation to 2 spaces. Also some other tweaks to be more similar to google style.
67 lines
2.7 KiB
C
67 lines
2.7 KiB
C
/**
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* This module fixes different things on the main loop of the game.
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*
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* First, it hooks into the X11 event loop to grab and dispatch inputs for
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* further IO hooks or input emulation.
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*
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* The second thing is quite stupid and fixes crashing on newer kernels
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* because AM used sigalarm to drive certain parts of their engine.
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* This only applies to one generation of the game engine which includes the
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* releases: Exceed, Exceed2, Zero and NX
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*
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* Detailed analysis:
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*
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* AM decided to poll the CPIU::Update function which contains updating
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* the render state as well as decoding sound data, using the signal SIGALRM.
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* This signal is triggered periodically and drives the whole engine.
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* But, starting kernel versions newer than 2.4.27 something changed which
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* causes the game to deadlock an _ALL_ kernels newer than said version. Trying
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* to fix the deadlock issue makes things even worse and only introduces
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* segfaults with random crashes. So this is not the right approach.
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* Starting NX2 AM used a newer kernel and apparently got the same problem
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* with their OS. They fixed it by moving music_send_data from CPIU::Update()
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* to the IO thread. Splitting CPIU::Update that way, this seems to work fine.
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* However, trying this with the old games lacking the patch, we are getting
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* segfaults (again).
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* It looks like there is an issue with firing and/or handling of SIGALRM in
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* another thread than the main thread (don't ask me why). This leads to the
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* solution of the problem: moving the call of CPIU::Update()to the main
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* thread which is only pumping XEvents (i.e. nothing).
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* So let's give the main thread some work: Detouring XPending and calling
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* the registered signal handler for SIGALRM of the game in there and muting
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* signal handling for SIGALRM. This solves all deadlocking and segfault
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* issues which are related to audio playback in combination with decoding a
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* video.
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*/
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#ifndef PATCH_MAIN_LOOP_H
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#define PATCH_MAIN_LOOP_H
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#include <X11/Xutil.h>
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#include <stdbool.h>
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/**
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* Initialize the patch module
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*
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* @param fix_sigalarm_main_loop True to enable the sigalarm thread fix (doc see
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* above)
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* @param disable_built_in_inputs Disable the built in keyboard inputs for test
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* (F1), service (F2) and clear (F3)
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* @param disable_mk3_linux_port_inputs Disable the built-in keyboard inputs on
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* the MK3 linux ports
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*/
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void patch_main_loop_init(
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bool fix_sigalarm_main_loop,
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bool disable_built_in_inputs,
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bool disable_mk3_linux_port_inputs);
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/**
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* Register a handler (multiple possible) to receive X11 input events, e.g. key
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* pressed, released
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*
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* @param lib_with_handler_impl Path to a library implementing the
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* x11-input-handler API
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*/
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void patch_main_loop_add_x11_input_handler(const char *lib_with_handler_impl);
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#endif
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