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modified prediction functions

This commit is contained in:
Christian Kroll 2009-11-05 19:13:30 +00:00
parent 300b6eff8e
commit 2e67e52e7b
2 changed files with 102 additions and 24 deletions
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85
games/tetris/playfield.c
View File

@ -2,8 +2,10 @@
#include <string.h>
#include <assert.h>
#include <inttypes.h>
#include "stdio.h"
#include "playfield.h"
#include "piece.h"
#include "bast.h"
/***************************
@ -35,7 +37,7 @@ tetris_playfield_status_t tetris_playfield_hoverStatus(tetris_playfield_t* pPl)
****************************/
/* Function: tetris_playfield_construct
* Description: constructs a playfield with the given diemensions
* Description: constructs a playfield with the given dimensions
* Argument nWidth: width of playfield (4 <= n <= 16)
* Argument nHeight: height of playfield (4 <= n <= 124)
* Return value: pointer to a newly created playfield
@ -515,8 +517,7 @@ int8_t tetris_playfield_getWidth(tetris_playfield_t *pPl)
/* Function: tetris_playfield_getHeight
* Description: returns the height of the playfield
* Argument pPl: the playfield we want information from
* Description: returns the height of the ayfield we want information from
* Return value: height of the playfield
*/
int8_t tetris_playfield_getHeight(tetris_playfield_t *pPl)
@ -695,49 +696,85 @@ int8_t tetris_playfield_predictCompleteLines(tetris_playfield_t *pPl,
}
/* Function: tetris_playfield_predictDumpRow
* Description: predicts the appearance of a playfield row for a piece
* at a given column
/* Function: tetris_playfield_predictBottomRow
* Description: predicts the appearance of the bottom row of the
* playfield (for a piece at a given column) and
* initializes an iterator structure
* Argument pIt: [out] a pointer to an iterator which should be initialized
* Argument pPl: the playfield on which we want to test a piece
* Argument pPiece: the piece which should be tested
* Argument nColumn: the column where the piece should be dropped
* Argument nRow: the row of interest
* Return value: appearance of the predicted dump row
* Return value: appearance of the predicted dump row at the bottom
*/
uint16_t tetris_playfield_predictDumpRow(tetris_playfield_t *pPl,
tetris_piece_t *pPiece,
int8_t nColumn,
int8_t nRow)
uint16_t* tetris_playfield_predictBottomRow(tetris_playfield_iterator_t *pIt,
tetris_playfield_t *pPl,
tetris_piece_t *pPiece,
int8_t nColumn)
{
pIt->pPlayfield = pPl;
pIt->pPiece = pPiece;
pIt->nColumn = nColumn;
pIt->nDeepestPieceRow =
tetris_playfield_predictDeepestRow(pPl, pPiece, nColumn);
pIt->nFullRow = 0xFFFF >> (16 - pPl->nWidth);
pIt->nCurrentRow = pPl->nHeight - 1;
pIt->nRowBuffer = 0;
return tetris_playfield_predictNextRow(pIt);
}
/* Function: tetris_playfield_predictNextRow
* Description: predicts the appearance of the next row of the playfield
* (for a given iterator)
* Argument pIt: a pointer to a dump iterator
* Return value: appearance of the next predicted dump row
*/
uint16_t* tetris_playfield_predictNextRow(tetris_playfield_iterator_t *pIt)
{
int8_t nPieceRow = tetris_playfield_predictDeepestRow(pPl, pPiece, nColumn);
uint16_t nPieceMap = 0;
if (nPieceRow > -4)
if ((pIt->nDeepestPieceRow > -4) && (pIt->nCurrentRow >= 0))
{
// determine sane start and stop values for the piece's indices
int8_t nStartRow = ((nPieceRow + 3) < pPl->nHeight) ?
(nPieceRow + 3) : pPl->nHeight - 1;
int8_t nStartRow =
((pIt->nDeepestPieceRow + 3) < pIt->pPlayfield->nHeight) ?
(pIt->nDeepestPieceRow + 3) : pIt->pPlayfield->nHeight - 1;
uint16_t nPiece = tetris_piece_getBitmap(pPiece);
uint16_t nPiece = tetris_piece_getBitmap(pIt->pPiece);
if ((nRow <= nStartRow) && (nRow >= nPieceRow))
if ((pIt->nCurrentRow <= nStartRow) &&
(pIt->nCurrentRow >= pIt->nDeepestPieceRow))
{
int8_t y = nRow - nPieceRow;
int8_t y = pIt->nCurrentRow - pIt->nDeepestPieceRow;
// clear all bits of the piece we are not interested in and
// align the rest to LSB
nPieceMap = (nPiece & (0x000F << (y << 2))) >> (y << 2);
// shift the remaining content to the current column
if (nColumn >= 0)
if (pIt->nColumn >= 0)
{
nPieceMap <<= nColumn;
nPieceMap <<= pIt->nColumn;
}
else
{
nPieceMap >>= -nColumn;
nPieceMap >>= -pIt->nColumn;
}
}
}
return pPl->dump[nRow] | nPieceMap;
pIt->nRowBuffer = pIt->pPlayfield->dump[pIt->nCurrentRow--] | nPieceMap;
// don't return full (and therefore removed) rows
if (pIt->nRowBuffer == pIt->nFullRow)
{
// recursively determine next row
return tetris_playfield_predictNextRow(pIt);
}
else
{
return &pIt->nRowBuffer;
}
}
else
{
return NULL;
}
}

41
games/tetris/playfield.h
View File

@ -45,6 +45,20 @@ typedef struct tetris_playfield_t
tetris_playfield_t;
// iterator for predicted dump rows
typedef struct tetris_playfield_iterator_t
{
tetris_playfield_t *pPlayfield; // playfield to be examined
tetris_piece_t *pPiece; // piece which should be tested
int8_t nColumn; // the column where the piece should be dropped
int8_t nDeepestPieceRow; // the deepest possible row for a piece
uint16_t nFullRow; // value of a full row
int8_t nCurrentRow; // the actual row in the playfield
uint16_t nRowBuffer; // internal buffer for returned row values
}
tetris_playfield_iterator_t;
/****************************
* construction/destruction *
****************************/
@ -248,4 +262,31 @@ uint16_t tetris_playfield_predictDumpRow(tetris_playfield_t *pPl,
int8_t nColumn,
int8_t nRow);
/* Function: tetris_playfield_predictBottomRow
* Description: predicts the appearance of the bottom row of the
* playfield (for a piece at a given column) and
* initializes an iterator structure
* Argument pIt: a pointer to an iterator which should be initialized
* Argument pPl: the playfield on which we want to test a piece
* Argument pPiece: the piece which should be tested
* Argument nColumn: the column where the piece should be dropped
* Return value: appearance of the predicted dump row at the bottom
*/
uint16_t* tetris_playfield_predictBottomRow(tetris_playfield_iterator_t *pIt,
tetris_playfield_t *pPl,
tetris_piece_t *pPiece,
int8_t nColumn);
/* Function: tetris_playfield_predictNextRow
* Description: predicts the appearance of the next row of the playfield
* (for a given iterator)
* Argument pIt: a pointer to a dump iterator
* Return value: appearance of the next predicted dump row
*/
uint16_t* tetris_playfield_predictNextRow(tetris_playfield_iterator_t *pIt);
#endif /*TETRIS_PLAYFIELD_H_*/