ref: 4e51962cbcc576edd6770b2f22eedfd3997af77e
dir: /src/events.c/
#include "events.h"
#include "backends/audio.h"
#include "backends/m8.h"
#include "common.h"
#include "config.h"
#include "gamecontrollers.h"
#include "render.h"
#include <SDL3/SDL.h>
#include <SDL3/SDL_events.h>
uint8_t keyjazz_enabled = 0;
uint8_t keyjazz_base_octave = 2;
uint8_t keyjazz_velocity = 0x64;
static uint8_t keycode = 0; // value of the pressed key
static input_msg_s key = {normal, 0, 0, 0};
static unsigned char toggle_input_keyjazz() {
keyjazz_enabled = !keyjazz_enabled;
SDL_LogDebug(SDL_LOG_CATEGORY_SYSTEM, keyjazz_enabled ? "Keyjazz enabled" : "Keyjazz disabled");
return keyjazz_enabled;
}
// Get note value for a scancode, or -1 if not found
static int get_note_for_scancode(const SDL_Scancode scancode) {
// Map from SDL scancodes to note offsets
const struct keyjazz_scancodes_t {
SDL_Scancode scancode;
uint8_t note_offset;
} NOTE_MAP[] = {
{SDL_SCANCODE_Z, 0}, {SDL_SCANCODE_S, 1}, {SDL_SCANCODE_X, 2}, {SDL_SCANCODE_D, 3},
{SDL_SCANCODE_C, 4}, {SDL_SCANCODE_V, 5}, {SDL_SCANCODE_G, 6}, {SDL_SCANCODE_B, 7},
{SDL_SCANCODE_H, 8}, {SDL_SCANCODE_N, 9}, {SDL_SCANCODE_J, 10}, {SDL_SCANCODE_M, 11},
{SDL_SCANCODE_Q, 12}, {SDL_SCANCODE_2, 13}, {SDL_SCANCODE_W, 14}, {SDL_SCANCODE_3, 15},
{SDL_SCANCODE_E, 16}, {SDL_SCANCODE_R, 17}, {SDL_SCANCODE_5, 18}, {SDL_SCANCODE_T, 19},
{SDL_SCANCODE_6, 20}, {SDL_SCANCODE_Y, 21}, {SDL_SCANCODE_7, 22}, {SDL_SCANCODE_U, 23},
{SDL_SCANCODE_I, 24}, {SDL_SCANCODE_9, 25}, {SDL_SCANCODE_O, 26}, {SDL_SCANCODE_0, 27},
{SDL_SCANCODE_P, 28},
};
const size_t NOTE_MAP_SIZE = (sizeof(NOTE_MAP) / sizeof(NOTE_MAP[0]));
for (size_t i = 0; i < NOTE_MAP_SIZE; i++) {
if (NOTE_MAP[i].scancode == scancode) {
return NOTE_MAP[i].note_offset + keyjazz_base_octave * 12;
}
}
return -1; // Not a note key
}
// Handle octave and velocity changes
static void handle_keyjazz_settings(const SDL_Event *event, const config_params_s *conf) {
// Constants for keyjazz limits and adjustments
const unsigned char KEYJAZZ_MIN_OCTAVE = 0;
const unsigned char KEYJAZZ_MAX_OCTAVE = 8;
const unsigned char KEYJAZZ_MIN_VELOCITY = 0;
const unsigned char KEYJAZZ_MAX_VELOCITY = 0x7F;
const unsigned char KEYJAZZ_FINE_VELOCITY_STEP = 1;
const unsigned char KEYJAZZ_COARSE_VELOCITY_STEP = 0x10;
if (event->key.repeat > 0 || event->key.type == SDL_EVENT_KEY_UP) {
return;
}
const SDL_Scancode scancode = event->key.scancode;
const bool is_fine_adjustment = (event->key.mod & SDL_KMOD_ALT) > 0;
if (scancode == conf->key_jazz_dec_octave && keyjazz_base_octave > KEYJAZZ_MIN_OCTAVE) {
keyjazz_base_octave--;
display_keyjazz_overlay(1, keyjazz_base_octave, keyjazz_velocity);
} else if (scancode == conf->key_jazz_inc_octave && keyjazz_base_octave < KEYJAZZ_MAX_OCTAVE) {
keyjazz_base_octave++;
display_keyjazz_overlay(1, keyjazz_base_octave, keyjazz_velocity);
} else if (scancode == conf->key_jazz_dec_velocity) {
const int step = is_fine_adjustment ? KEYJAZZ_FINE_VELOCITY_STEP : KEYJAZZ_COARSE_VELOCITY_STEP;
if (keyjazz_velocity > (is_fine_adjustment ? KEYJAZZ_MIN_VELOCITY + step : step)) {
keyjazz_velocity -= step;
display_keyjazz_overlay(1, keyjazz_base_octave, keyjazz_velocity);
}
} else if (scancode == conf->key_jazz_inc_velocity) {
const int step = is_fine_adjustment ? KEYJAZZ_FINE_VELOCITY_STEP : KEYJAZZ_COARSE_VELOCITY_STEP;
const int max = is_fine_adjustment ? KEYJAZZ_MAX_VELOCITY : (KEYJAZZ_MAX_VELOCITY - step);
if (keyjazz_velocity < max) {
keyjazz_velocity += step;
display_keyjazz_overlay(1, keyjazz_base_octave, keyjazz_velocity);
}
}
}
static input_msg_s handle_keyjazz(const SDL_Event *event, uint8_t keyvalue,
const config_params_s *conf) {
input_msg_s key = {keyjazz, keyvalue, keyjazz_velocity, event->type};
// Check if this is a note key
const int note_value = get_note_for_scancode(event->key.scancode);
if (note_value >= 0) {
key.value = note_value;
return key;
}
// Not a note key, handle other settings
key.type = normal;
handle_keyjazz_settings(event, conf);
return key;
}
/**
* Handles key inputs based on SDL events and predefined configuration mappings.
* Maps SDL keyboard events to corresponding input messages.
* Provides a default message if no matching key mapping is found.
*
* @param event Pointer to the SDL_Event structure representing the current keyboard event.
* @param conf Pointer to the config_params_s structure containing key mapping configurations.
* @return An input_msg_s structure corresponding to the processed key input or a default message if
* no match is found.
*/
static input_msg_s handle_m8_keys(const SDL_Event *event, const config_params_s *conf) {
// Default message with normal type and no value
input_msg_s key = {normal, 0, 0, 0};
// Get the current scancode
const SDL_Scancode scancode = event->key.scancode;
// Handle standard keycodes (single key mapping)
const struct {
SDL_Scancode scancode;
uint8_t value;
} normal_key_map[] = {
{conf->key_up, key_up},
{conf->key_left, key_left},
{conf->key_down, key_down},
{conf->key_right, key_right},
{conf->key_select, key_select},
{conf->key_select_alt, key_select},
{conf->key_start, key_start},
{conf->key_start_alt, key_start},
{conf->key_opt, key_opt},
{conf->key_opt_alt, key_opt},
{conf->key_edit, key_edit},
{conf->key_edit_alt, key_edit},
{conf->key_delete, key_opt | key_edit},
};
// Handle special messages (different message type)
const struct {
SDL_Scancode scancode;
special_messages_t message;
} special_key_map[] = {
{conf->key_reset, msg_reset_display},
{conf->key_toggle_audio, msg_toggle_audio},
};
// Check normal key mappings
for (size_t i = 0; i < sizeof(normal_key_map) / sizeof(normal_key_map[0]); i++) {
if (scancode == normal_key_map[i].scancode) {
key.value = normal_key_map[i].value;
return key;
}
}
// Check special key mappings
for (size_t i = 0; i < sizeof(special_key_map) / sizeof(special_key_map[0]); i++) {
if (scancode == special_key_map[i].scancode) {
key.type = special;
key.value = special_key_map[i].message;
return key;
}
}
// No matching key found, return default key message
return key;
}
void handle_key_down_event(struct app_context *ctx, SDL_Event *event) {
if (event->key.repeat > 0) {
return;
}
if (event->key.key == SDLK_RETURN && (event->key.mod & SDL_KMOD_ALT) > 0) {
toggle_fullscreen();
return;
}
if (event->key.key == SDLK_F4 && (event->key.mod & SDL_KMOD_ALT) > 0) {
key = (input_msg_s){special, msg_quit, 0, 0};
return;
}
if (event->key.key == SDLK_ESCAPE) {
display_keyjazz_overlay(toggle_input_keyjazz(), keyjazz_base_octave, keyjazz_velocity);
return;
}
key = handle_m8_keys(event, &ctx->conf);
SDL_Log("key %d", key.value);
if (keyjazz_enabled) {
SDL_Log("keyjazzzzzz");
key = handle_keyjazz(event, key.value, &ctx->conf);
}
keycode = (key.type == normal) ? (keycode | key.value) : key.value;
input_process(ctx);
}
void handle_key_up_event(struct app_context *ctx, SDL_Event *event) {
key = handle_m8_keys(event, &ctx->conf);
if (keyjazz_enabled) {
key = handle_keyjazz(event, key.value, &ctx->conf);
}
keycode = (key.type == normal) ? (keycode & ~key.value) : 0;
input_process(ctx);
}
SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event) {
struct app_context *ctx = appstate;
SDL_AppResult ret_val = SDL_APP_CONTINUE;
static int prev_key_analog = 0;
switch (event->type) {
// --- System events ---
case SDL_EVENT_QUIT:
case SDL_EVENT_TERMINATING:
ret_val = SDL_APP_SUCCESS;
break;
case SDL_EVENT_DID_ENTER_BACKGROUND:
// iOS: Application entered into background on iOS. About 5 seconds to stop things.
SDL_LogDebug(SDL_LOG_CATEGORY_SYSTEM, "Received SDL_EVENT_DID_ENTER_BACKGROUND");
ctx->app_suspended = 1;
if (ctx->device_connected)
m8_pause_processing();
break;
case SDL_EVENT_WILL_ENTER_BACKGROUND:
// iOS: App about to enter into background
break;
case SDL_EVENT_WILL_ENTER_FOREGROUND:
// iOS: App returning to foreground
SDL_LogDebug(SDL_LOG_CATEGORY_SYSTEM, "Received SDL_EVENT_WILL_ENTER_FOREGROUND");
break;
case SDL_EVENT_DID_ENTER_FOREGROUND:
// iOS: App becomes interactive again
SDL_LogDebug(SDL_LOG_CATEGORY_SYSTEM, "Received SDL_EVENT_DID_ENTER_FOREGROUND");
ctx->app_suspended = 0;
if (ctx->device_connected) {
m8_resume_processing();
}
case SDL_EVENT_WINDOW_RESIZED:
case SDL_EVENT_WINDOW_MOVED:
// If window size is changed, some operating systems might need a little nudge to fix scaling
renderer_fix_texture_scaling_after_window_resize();
break;
// --- Input events ---
case SDL_EVENT_GAMEPAD_ADDED:
case SDL_EVENT_GAMEPAD_REMOVED:
// Reinitialize game controllers on controller add/remove/remap
gamecontrollers_initialize();
break;
case SDL_EVENT_KEY_DOWN:
handle_key_down_event(ctx, event);
break;
case SDL_EVENT_KEY_UP:
handle_key_up_event(ctx, event);
break;
default:
break;
}
return ret_val;
}
int input_process(struct app_context *ctx) {
static unsigned char prev_input = 0;
static unsigned char prev_note = 0;
// get current inputs
const input_msg_s input = (input_msg_s){key.type, keycode, 0, 0};
SDL_LogDebug(SDL_LOG_CATEGORY_APPLICATION, "input: type %d value %d", input.type, input.value);
switch (input.type) {
case normal:
if (input.value != prev_input) {
prev_input = input.value;
m8_send_msg_controller(input.value);
}
break;
case keyjazz:
if (input.value != 0) {
if (input.eventType == SDL_EVENT_KEY_DOWN && input.value != prev_input) {
SDL_Log("keyjazz???");
m8_send_msg_keyjazz(input.value, input.value2);
prev_note = input.value;
} else if (input.eventType == SDL_EVENT_KEY_UP && input.value == prev_note) {
m8_send_msg_keyjazz(0xFF, 0);
}
}
prev_input = input.value;
break;
case special:
if (input.value != prev_input) {
prev_input = input.value;
switch (input.value) {
case msg_quit:
SDL_LogDebug(SDL_LOG_CATEGORY_APPLICATION, "Received msg_quit from input device.");
ctx->app_state = QUIT;
break;
case msg_reset_display:
m8_reset_display();
break;
case msg_toggle_audio:
ctx->conf.audio_enabled = !ctx->conf.audio_enabled;
audio_toggle(ctx->conf.audio_device_name, ctx->conf.audio_buffer_size);
break;
default:
break;
}
break;
}
}
return 1;
}
/*
// Returns the currently pressed keys to main
input_msg_s input_get_msg(config_params_s *conf) {
// Query for SDL events
handle_sdl_events(conf);
if (!keyjazz_enabled && keycode == (key_start | key_select | key_opt | key_edit)) {
key = (input_msg_s){special, msg_reset_display, 0, 0};
}
if (key.type == normal) {
//Normal input keys go through some event-based manipulation in
// handle_sdl_events(), the value is stored in keycode variable
return input;
}
// Special event keys already have the correct keycode baked in
return key;
}
// Handles SDL input events
static void handle_sdl_events(const config_params_s *conf) {
static int prev_key_analog = 0;
SDL_Event event;
// Read joysticks
const int key_analog = gamecontrollers_handle_buttons(conf);
if (prev_key_analog != key_analog) {
keycode = key_analog;
prev_key_analog = key_analog;
}
const input_msg_s gamepad_msg = gamecontrollers_handle_special_messages(conf);
if (gamepad_msg.type == special) {
key = gamepad_msg;
}
}
*/