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Attempts to improve SDL key merging.

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This commit is contained in:
Thomas Harte
2020-03-05 21:56:26 -05:00
parent 462a76dd96
commit 58b8dfb929
3 changed files with 51 additions and 16 deletions
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OSBindings/SDL/main.cpp
+46 -11
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@@ -16,7 +16,7 @@
#include <memory>
#include <sys/stat.h>
#include <unistd.h>
#include <unordered_map>
#include <map>
#include <SDL2/SDL.h>
@@ -773,7 +773,7 @@ int main(int argc, char *argv[]) {
std::string input;
SDL_Scancode scancode = SDL_SCANCODE_UNKNOWN;
};
std::unordered_map<uint32_t, KeyPress> keypresses;
std::map<uint32_t, KeyPress> keypresses;
// Run the main event loop until the OS tells us to quit.
const bool uses_mouse = !!machine->mouse_machine();
@@ -904,9 +904,8 @@ int main(int argc, char *argv[]) {
break;
}
const bool is_pressed = event.type == SDL_KEYDOWN;
keypresses[event.text.timestamp].scancode = event.key.keysym.scancode;
keypresses[event.text.timestamp].is_down = is_pressed;
keypresses[event.text.timestamp].is_down = event.type == SDL_KEYDOWN;
} break;
case SDL_MOUSEBUTTONDOWN:
@@ -938,14 +937,50 @@ int main(int argc, char *argv[]) {
}
}
// Look for potential keypress merges; SDL doesn't in any capacity guarantee that keypresses that produce
// symbols will be delivered with the same timestamp. So look for any pairs of recorded kepresses that are
// close together temporally and otherwise seem to match.
std::vector<KeyPress> matched_keypresses;
if(keypresses.size()) {
auto next_keypress = keypresses.begin();
while(next_keypress != keypresses.end()) {
auto keypress = next_keypress;
++next_keypress;
// If the two appear to pair off, push a combination and advance twice.
// Otherwise, keep just the first and advance once.
if(
next_keypress != keypresses.end() &&
keypress->first >= next_keypress->first - 5 &&
keypress->second.is_down && next_keypress->second.is_down &&
!keypress->second.input.size() != !next_keypress->second.input.size() &&
(keypress->second.scancode != SDL_SCANCODE_UNKNOWN) != (next_keypress->second.scancode != SDL_SCANCODE_UNKNOWN)) {
KeyPress combined_keypress;
if(keypress->second.scancode != SDL_SCANCODE_UNKNOWN) {
combined_keypress.scancode = keypress->second.scancode;
combined_keypress.input = std::move(next_keypress->second.input);
} else {
combined_keypress.scancode = next_keypress->second.scancode;
combined_keypress.input = std::move(keypress->second.input);
};
++next_keypress;
} else {
matched_keypresses.push_back(keypress->second);
}
}
}
// Handle accumulated key states.
JoystickMachine::Machine *const joystick_machine = machine->joystick_machine();
for (const auto &keypress: keypresses) {
for (const auto &keypress: matched_keypresses) {
// Try to set this key on the keyboard first, if there is one.
if(keyboard_machine) {
Inputs::Keyboard::Key key = Inputs::Keyboard::Key::Space;
if( KeyboardKeyForSDLScancode(keypress.second.scancode, key) &&
keyboard_machine->apply_key(key, keypress.second.input.size() ? keypress.second.input[0] : 0, keypress.second.is_down, logical_keyboard)) {
if( KeyboardKeyForSDLScancode(keypress.scancode, key) &&
keyboard_machine->apply_key(key, keypress.input.size() ? keypress.input[0] : 0, keypress.is_down, logical_keyboard)) {
continue;
}
}
@@ -954,8 +989,8 @@ int main(int argc, char *argv[]) {
if(joystick_machine) {
auto &joysticks = joystick_machine->get_joysticks();
if(!joysticks.empty()) {
const bool is_pressed = keypress.second.is_down;
switch(keypress.second.scancode) {
const bool is_pressed = keypress.is_down;
switch(keypress.scancode) {
case SDL_SCANCODE_LEFT: joysticks[0]->set_input(Inputs::Joystick::Input::Left, is_pressed); break;
case SDL_SCANCODE_RIGHT: joysticks[0]->set_input(Inputs::Joystick::Input::Right, is_pressed); break;
case SDL_SCANCODE_UP: joysticks[0]->set_input(Inputs::Joystick::Input::Up, is_pressed); break;
@@ -966,8 +1001,8 @@ int main(int argc, char *argv[]) {
case SDL_SCANCODE_D: joysticks[0]->set_input(Inputs::Joystick::Input(Inputs::Joystick::Input::Fire, 2), is_pressed); break;
case SDL_SCANCODE_F: joysticks[0]->set_input(Inputs::Joystick::Input(Inputs::Joystick::Input::Fire, 3), is_pressed); break;
default: {
if(keypress.second.input.size()) {
joysticks[0]->set_input(Inputs::Joystick::Input(keypress.second.input[0]), is_pressed);
if(keypress.input.size()) {
joysticks[0]->set_input(Inputs::Joystick::Input(keypress.input[0]), is_pressed);
}
} break;
}