GameLib/src/Input.c

// Copyright (C) 2011-2023 Valeriano Alfonso Rodriguez (Kableado)

#include <SDL.h>
#include <math.h>
#ifdef EMSCRIPTEN
#define SDL_GetKeyState SDL_GetKeyboardState
#endif

#include "Input.h"
#include "Util.h"

// Globals
InputKeyStatus _keys[InputKey_Max];

int _pointerDown = 0;
float _pointerX  = 0;
float _pointerY  = 0;

int _clicked            = 0;
float _clickedPositionX = 0;
float _clickedPositionY = 0;

/////////////////////////////
// Input_Init
//
// Initializes the game input.
int Input_Init() {
	int i;

	// Mark released all the keys
	for (i = 0; i < InputKey_Max; i++) {
		_keys[i] = InputKey_Released;
	}

	return (1);
}

/////////////////////////////
// Input_Frame
//
// Notify a frame update to the input subsystem.
void Input_Frame() {
	Uint8 *keys;

	// Get keyboard state
	keys = (Uint8 *)SDL_GetKeyboardState(NULL);

	// Process Keys
	Input_SetKey(InputKey_Action1, keys[SDL_SCANCODE_Z] | keys[SDL_SCANCODE_O]);
	Input_SetKey(InputKey_Action2, keys[SDL_SCANCODE_X] | keys[SDL_SCANCODE_P]);
	Input_SetKey(InputKey_Up, keys[SDL_SCANCODE_UP] | keys[SDL_SCANCODE_W]);
	Input_SetKey(InputKey_Down, keys[SDL_SCANCODE_DOWN] | keys[SDL_SCANCODE_S]);
	Input_SetKey(InputKey_Left, keys[SDL_SCANCODE_LEFT] | keys[SDL_SCANCODE_A]);
	Input_SetKey(InputKey_Right, keys[SDL_SCANCODE_RIGHT] | keys[SDL_SCANCODE_D]);
	Input_SetKey(InputKey_Jump, keys[SDL_SCANCODE_SPACE]);
	Input_SetKey(
		InputKey_Continue,
		keys[SDL_SCANCODE_RETURN] | keys[SDL_SCANCODE_RETURN2] | keys[SDL_SCANCODE_KP_ENTER] | _pointerDown);

	Input_SetKey(InputKey_DumpProfiling, keys[SDL_SCANCODE_M]);
	Input_SetKey(InputKey_Screenshot, keys[SDL_SCANCODE_F12]);
}

/////////////////////////////
// Input_PostFrame
//
// Notify a frame update to the input subsystem.
void Input_PostFrame() {
	Input_SetKey(InputKey_Exit, 0);
	_clicked = 0;
}

/////////////////////////////
// Input_SetKey
//
// Notify a key press to the input subsystem.
void Input_SetKey(InputKey key, int status) {
	if (!status) {
		_keys[key] = InputKey_Released;
	} else {
		if (_keys[key] >= InputKey_Pressed) {
			_keys[key] = InputKey_Holded;
		} else {
			_keys[key] = InputKey_Pressed;
		}
	}
}

/////////////////////////////
// Input_GetKey
//
// Reports a the status of a key.
InputKeyStatus Input_GetKey(InputKey key) { return (_keys[key]); }

/////////////////////////////
// Input_SetPointerPosition
//
void Input_SetPointerPosition(float x, float y) {
	_pointerX = x;
	_pointerY = y;
}

/////////////////////////////
// Input_SetPointerDown
//
void Input_SetPointerDown(int pointerDown) {
	if (pointerDown == 0 && _pointerDown == 1) {
		_clicked          = 1;
		_clickedPositionX = _pointerX;
		_clickedPositionY = _pointerY;
	}
	_pointerDown = pointerDown;
}

/////////////////////////////
// Input_GetPointerDown
//
int Input_GetPointerDown() { return _pointerDown; }

/////////////////////////////
// Input_GetPointerPosition
//
int Input_GetPointerPosition(vec2 pointer) {
	pointer[0] = _pointerX;
	pointer[1] = _pointerY;
	return _pointerDown;
}

/////////////////////////////
// Input_GetClickedPosition
//
int Input_GetClickedPosition(vec2 clickPosition) {
	clickPosition[0] = _clickedPositionX;
	clickPosition[1] = _clickedPositionY;
	return _clicked;
}

/////////////////////////////
// Input_AnyKey
//
//
int Input_AnyKey() {
	int i;
	for (i = 0; i < InputKey_Max; i++) {
		if (_keys[i] == InputKey_Pressed) {
			return (1);
		}
	}
	return (0);
}

/////////////////////////////
// Input_GetDir
//
// Reports the direction of the dpad and mouse.
int Input_GetDir(vec2 dir) {
	float vlen;
	Uint8 buttons;
	int mx, my;
	float dlen;
	extern int g_Width, g_Height;

	// Get mouse state
	buttons = SDL_GetMouseState(&mx, &my);
	if (buttons) {
		// Use the mouse
		vec2_set(dir, mx - (g_Width / 2), my - (g_Height / 2.0f));
		dlen = 1.0f / sqrtf(vec2_dot(dir, dir));
		vec2_scale(dir, dir, dlen);
		return (1);
	} else {
		// Use the keyboar
		vec2_set(dir, 0.0f, 0.0f);
		if (Input_GetKey(InputKey_Up)) {
			dir[1] -= 1.0f;
		}
		if (Input_GetKey(InputKey_Down)) {
			dir[1] += 1.0f;
		}
		if (Input_GetKey(InputKey_Left)) {
			dir[0] -= 1.0f;
		}
		if (Input_GetKey(InputKey_Right)) {
			dir[0] += 1.0f;
		}
		vlen = vec2_dot(dir, dir);
		if (vlen > 0.0f) {
			vlen = sqrtf(vlen);
			vec2_scale(dir, dir, 1.0f / vlen);
			return (1);
		} else {
			return (0);
		}
	}
}

/////////////////////////////
// Input_GetKeyDir
//
// Reports the direction of the dpad.
int Input_GetKeyDir(vec2 dir) {
	float vlen;

	// Use the keyboard
	vec2_set(dir, 0.0f, 0.0f);
	if (Input_GetKey(InputKey_Up)) {
		dir[1] -= 1.0f;
	}
	if (Input_GetKey(InputKey_Down)) {
		dir[1] += 1.0f;
	}
	if (Input_GetKey(InputKey_Left)) {
		dir[0] -= 1.0f;
	}
	if (Input_GetKey(InputKey_Right)) {
		dir[0] += 1.0f;
	}
	vlen = vec2_dot(dir, dir);
	if (vlen > 0.0f) {
		vlen = sqrtf(vlen);
		vec2_scale(dir, dir, 1.0f / vlen);
		return (1);
	} else {
		return (0);
	}
}