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#ifndef INPUT_H_
#define INPUT_H_
#include <inttypes.h>
/***********
* defines *
***********/
// number of levels
#define TETRIS_INPUT_LEVELS 20
/*********
* types *
*********/
typedef enum tetris_input_command_t
{
TETRIS_INCMD_ROT_CW, // rotate clockwise
TETRIS_INCMD_ROT_CCW, // rotate counter clockwise
TETRIS_INCMD_LEFT, // move piece left
TETRIS_INCMD_RIGHT, // move piece right
TETRIS_INCMD_DOWN, // lower piece by one row
TETRIS_INCMD_DROP, // move piece to the ground immediately
TETRIS_INCMD_GRAVITY, // piece gets pulled by gravity
TETRIS_INCMD_PAUSE, // pause the game
TETRIS_INCMD_NONE // idle (must alway be the last one)
}
tetris_input_command_t;
typedef enum tetris_input_pace_t
{
TETRIS_INPACE_HOVERING, // normal falling pace
TETRIS_INPACE_GLIDING /* guarantees a minimum docking time to avoid that
pieces are docked immediately if they hit something
in higher levels */
}
tetris_input_pace_t;
typedef struct tetris_input_t
{
// current level (determines falling speed)
uint8_t nLevel;
// Amount of loop cycles between forced piece movements. This value gets
// set via the tetris_input_setLevel() function.
uint8_t nMaxCycles;
// This counter keeps track of the number of loop cycles whoch have been
// done since the last forced piece movement. It gets reset if it either
// reaches a well defined value (causing a gravity command to be issued)
// or the player has moved down the piece herself/himself.
uint8_t nLoopCycles;
// Amount of loop cycles in which the same command has been issued
// consecutively. It gets reset if either the current command differs from
// the last one or a well-defined value has been reached (thereby
// regulating the pace of the key repeat as commands are only processed
// if that value is reached).
int8_t nRepeatCount;
// Keeps track of the number loop cycles which have been run while in
// pause mode. As soon as a well defined value is reached, the game
// continues (in case someone paused the game and forgot to resume it).
uint16_t nPauseCount;
// last command (important for key repeat)
tetris_input_command_t cmdLast;
// Every command has its own counter. A command is ignored as long as its
// counter is unequal to 0. A counter gets set to a specific value (or 0)
// if the button of the corresponding command has been released by the
// player. All counters get decremented by one every loop cycle until they
// are zero. This is used to work against joystick chatter. Look at the
// TETRIS_INPUT_CHATTER_TICKS_... constants in input.c for the initial
// values of these counters.
uint8_t nIgnoreCmdCounter[TETRIS_INCMD_NONE];
}
tetris_input_t;
/****************************
* construction/destruction *
****************************/
/* Function: tetris_input_construct
* Description: constructs an input object for André's borg
* Return value: pointer to a newly created input object
*/
tetris_input_t *tetris_input_construct();
/* Function: tetris_input_destruct
* Description: destructs an input object
* Argument pIn: pointer to the input object which should be destructed
* Return value: void
*/
void tetris_input_destruct(tetris_input_t *pIn);
/***************************
* input related functions *
***************************/
/* Function: retris_input_getCommand
* Description: retrieves commands from joystick or loop interval
* Argument pIn: pointer to an input object
* Argument nPace: falling pace (see definition of tetris_input_pace_t)
* Return value: see definition of tetris_input_command_t
*/
tetris_input_command_t tetris_input_getCommand(tetris_input_t *pIn,
tetris_input_pace_t nPace);
/* Function: tetris_input_setLevel
* Description: modifies time interval of input events
* Argument pIn: pointer to an input object
* Argument nLvl: desired level (0 <= nLvl <= TETRIS_INPUT_LEVELS - 1)
* Return value: void
*/
void tetris_input_setLevel(tetris_input_t *pIn,
uint8_t nLvl);
#endif /*INPUT_H_*/