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main.cpp
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main.cpp
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#include <stdint.h>
#include <stdlib.h>
#include "gba.h"
#include "objects.h"
#include "tiles.h"
#include "font.h"
#define BOARD_OFFSET_X 2
#define BOARD_OFFSET_Y 2
enum PieceColours {WHITE = 0, BLACK = 1};
enum PieceNames {KING, QUEEN, BISHOP, KNIGHT, ROOK, PAWN};
enum TileNames {WHITE_TILE, BLACK_TILE, WHITE_R_TILE, BLACK_R_TILE, WHITE_G_TILE, BLACK_G_TILE};
enum Colors {RED, GREEN};
int _pieces[2][6];
int _tileNames[6];
int _pieceLayout[8][8] =
{
{10, 9, 8, 7, 6, 8, 9, 10},
{11, 11, 11, 11, 11, 11, 11, 11},
{-1, -1, -1, -1, -1, -1, -1, -1},
{-1, -1, -1, -1, -1, -1, -1, -1},
{-1, -1, -1, -1, -1, -1, -1, -1},
{-1, -1, -1, -1, -1, -1, -1, -1},
{ 5, 5, 5, 5, 5, 5, 5, 5},
{ 4, 3, 2, 1, 0, 2, 3, 4},
};
int _lostPieces[2][16];
// int _pieceLayout[8][8] =
// {
// {-1, -1, -1, -1, -1, -1, -1, -1},
// {-1, -1, -1, -1, -1, -1, -1, -1},
// {-1, -1, -1, -1, -1, -1, -1, -1},
// {-1, -1, -1, 2, -1, -1, -1, -1},
// {-1, -1, -1, -1, -1, -1, -1, -1},
// {-1, -1, -1, -1, -1, -1, -1, -1},
// {-1, -1, -1, -1, -1, -1, -1, -1},
// {-1, -1, -1, -1, -1, -1, -1, -1},
// };
int PieceType(int x, int y);
int PieceColor(int x, int y);
bool PieceAt(int x, int y);
void ClearHighlights();
void Highlight(int x, int y, int c);
void PlacePieces();
void DrawChessBoard();
void DrawFourTilesAt(int x, int y, int sbb, int tileStart);
void EraseFourTilesAt(int x, int y, int sbb);
bool TileIsWhite(int x, int y);
void InitialiseStage();
void LoadAssets();
int AddSquareBGTile(uint8_t t[4][64], int pos);
void AvailableMoves(int x, int y, int* moves, int* takingMoves);
void MovePiece(int cx, int cy, int nx, int ny);
void TakePiece(int cx, int cy, int nx, int ny);
class Cursor
{
private:
int _x, _y, _id;
public:
Cursor(int objId)
{
_id = objId;
SetObject(_id,
ATTR0_SHAPE(0) | ATTR0_8BPP | ATTR0_REG | ATTR0_Y(0),
ATTR1_SIZE(1) | ATTR1_X(0),
ATTR2_ID8(0));
_x = 0;
_y = 0;
SetObjectX(_id, (_x + BOARD_OFFSET_X / 2) * 16);
SetObjectY(_id, (_y + BOARD_OFFSET_Y / 2) * 16);
}
int X()
{
return _x;
}
int Y()
{
return _y;
}
void Move(int xMove, int yMove)
{
if(_x + xMove >= 0 && _x + xMove < 8)
_x += xMove;
if(_y + yMove >= 0 && _y + yMove < 8)
_y += yMove;
SetObjectX(_id, (_x + BOARD_OFFSET_X / 2) * 16);
SetObjectY(_id, (_y + BOARD_OFFSET_Y / 2) * 16);
}
};
void DrawString(int x, int y, const char* line, int lineLength)
{
for(int i = 0; i < lineLength; i++)
SetTile(30, x + i, y, (int)line[i]);
}
int main()
{
LoadAssets();
ClearObjects();
InitialiseStage();
uint16_t oldKeys = REG_P1;
Cursor cursor = Cursor(0);
bool pieceSelected = false;
int currentPiece = 0;
int* moves = new int[28];
int* takingMoves = new int[16];
int currentTurnColor = WHITE;
for(int i = 0; i < 2; i++)
for(int j = 0; j < 16; j++)
_lostPieces[i][j] = -1;
while (true)
{
if(!(REG_P1 & KEY_RIGHT) && (oldKeys & KEY_RIGHT))
cursor.Move(1, 0);
if(!(REG_P1 & KEY_LEFT) && (oldKeys & KEY_LEFT))
cursor.Move(-1, 0);
if(!(REG_P1 & KEY_DOWN) && (oldKeys & KEY_DOWN))
cursor.Move(0, 1);
if(!(REG_P1 & KEY_UP) && (oldKeys & KEY_UP))
cursor.Move(0, -1);
if(!(REG_P1 & KEY_A) && (oldKeys & KEY_A))
{
if(PieceAt(cursor.X(), cursor.Y()))
{
pieceSelected = true;
for(int i = 0; i < 16 && takingMoves[i] >= 0; i++)
if(takingMoves[i] % 8 == cursor.X() && takingMoves[i] / 8 == cursor.Y())
{
TakePiece(currentPiece % 8, currentPiece / 8, cursor.X(), cursor.Y());
currentTurnColor = (currentTurnColor == WHITE ? BLACK : WHITE);
pieceSelected = false;
ClearHighlights();
takingMoves[0] = -1;
break;
}
if(pieceSelected && PieceColor(cursor.X(), cursor.Y()) == currentTurnColor)
{
ClearHighlights();
AvailableMoves(cursor.X(), cursor.Y(), moves, takingMoves);
currentPiece = cursor.Y() * 8 + cursor.X();
for(int i = 0; i < 28 && moves[i] >= 0; i++)
Highlight(moves[i] % 8, moves[i] / 8, GREEN);
for(int i = 0; i < 16 && takingMoves[i] >= 0; i++)
Highlight(takingMoves[i] % 8, takingMoves[i] / 8, RED);
}
}
else if(pieceSelected)
{
ClearHighlights();
if(!PieceAt(cursor.X(), cursor.Y()))
{
for(int i = 0; i < 28 && moves[i] >= 0; i++)
if(moves[i] % 8 == cursor.X() && moves[i] / 8 == cursor.Y())
{
MovePiece(currentPiece % 8, currentPiece / 8, cursor.X(), cursor.Y());
currentTurnColor = (currentTurnColor == WHITE ? BLACK : WHITE);
pieceSelected = false;
break;
}
}
}
}
oldKeys = REG_P1;
if(currentTurnColor == WHITE)
DrawString(20, 1, "WHITE", 5);
else
DrawString(20, 1, "BLACK", 5);
WaitVSync();
UpdateObjects();
}
return 0;
}
void MovePiece(int cx, int cy, int nx, int ny)
{
DrawFourTilesAt(nx * 2 + BOARD_OFFSET_X, ny * 2 + BOARD_OFFSET_Y, 29, _pieces[PieceColor(cx, cy)][PieceType(cx, cy)]);
EraseFourTilesAt(cx * 2 + BOARD_OFFSET_X, cy * 2 + BOARD_OFFSET_Y, 29);
_pieceLayout[ny][nx] = _pieceLayout[cy][cx];
_pieceLayout[cy][cx] = -1;
}
void TakePiece(int cx, int cy, int nx, int ny)
{
MovePiece(cx, cy, nx, ny);
}
void HorizontalMovesFrom(int x, int y, int* moves, int &nextMoveSlot, int* takingMoves, int &nextTMoveSlot)
{
for(int i = x + 1; i < 8; i++)
if(!PieceAt(i, y))
moves[nextMoveSlot++] = y * 8 + i;
else if(PieceColor(i, y) != PieceColor(x, y))
{
takingMoves[nextTMoveSlot++] = y * 8 + i;
break;
}
else
break;
for(int i = x - 1; i >= 0; i--)
if(!PieceAt(i, y))
moves[nextMoveSlot++] = y * 8 + i;
else if(PieceColor(i, y) != PieceColor(x, y))
{
takingMoves[nextTMoveSlot++] = y * 8 + i;
break;
}
else
break;
for(int i = y + 1; i < 8; i++)
if(!PieceAt(x, i))
moves[nextMoveSlot++] = i * 8 + x;
else if(PieceColor(x, i) != PieceColor(x, y))
{
takingMoves[nextTMoveSlot++] = i * 8 + x;
break;
}
else
break;
for(int i = y - 1; i >= 0; i--)
if(!PieceAt(x, i))
moves[nextMoveSlot++] = i * 8 + x;
else if(PieceColor(x, i) != PieceColor(x, y))
{
takingMoves[nextTMoveSlot++] = i * 8 + x;
break;
}
else
break;
}
void DiagonalMovesFrom(int x, int y, int* moves, int &nextMoveSlot, int* takingMoves, int &nextTMoveSlot)
{
for(int i = 0; i < x && i < y; i++)
{
int nx = x - i - 1, ny = y - i - 1;
if(!PieceAt(nx, ny))
moves[nextMoveSlot++] = ny * 8 + nx;
else if(PieceColor(nx, ny) != PieceColor(x, y))
{
takingMoves[nextTMoveSlot++] = ny * 8 + nx;
break;
}
else
break;
}
for(int i = 0; i < x && y + i < 8; i++)
{
int nx = x - i - 1, ny = y + i + 1;
if(ny < 8)
{
if(!PieceAt(nx, ny))
moves[nextMoveSlot++] = ny * 8 + nx;
else if(PieceColor(nx, ny) != PieceColor(x, y))
{
takingMoves[nextTMoveSlot++] = ny * 8 + nx;
break;
}
else
break;
}
}
for(int i = x + 1; i < 8; i++)
{
int nx = i, ny = y + (i - x);
if(ny < 8)
{
if(!PieceAt(nx, ny))
moves[nextMoveSlot++] = ny * 8 + nx;
else if(PieceColor(nx, ny) != PieceColor(x, y))
{
takingMoves[nextTMoveSlot++] = ny * 8 + nx;
break;
}
else
break;
}
}
for(int i = x + 1; i < 8; i++)
{
int nx = i, ny = y - (i - x);
if(!PieceAt(nx, ny))
moves[nextMoveSlot++] = ny * 8 + nx;
else if(PieceColor(nx, ny) != PieceColor(x, y))
{
takingMoves[nextTMoveSlot++] = ny * 8 + nx;
break;
}
else
break;
}
}
void AvailableMoves(int x, int y, int* moves, int* takingMoves)
{
// Maximum number of moves available at one time is 28 (Queen at C3)
int kPTC[8][2] = {{-2,-1},{-2,1},{-1,-2},{1,-2},{2,-1},{2,1},{1,2},{-1,2}};
int kingPTC[8][2] = {{-1,0},{1,0},{0,-1},{0,1},{-1,-1},{-1,1},{1,-1},{1,1}};
for(int i = 0; i < 28; i++)
moves[i] = -1;
for(int i = 0; i < 16; i++)
takingMoves[i] = -1;
if(PieceAt(x, y))
{
int colour = PieceColor(x, y);
int type = PieceType(x, y);
int nextMoveSlot = 0;
int nextTMoveSlot = 0;
switch(type)
{
case KING:
for(int i = 0; i < 8; i++)
{
int nx = x + kingPTC[i][0], ny = y + kingPTC[i][1];
if(nx >= 0 && ny >= 0 && nx < 8 && ny < 8)
{
if(!PieceAt(nx, ny))
moves[nextMoveSlot++] = ny * 8 + nx;
else if(PieceColor(nx, ny) != colour)
takingMoves[nextTMoveSlot++] = ny * 8 + nx;
}
}
break;
case QUEEN:
HorizontalMovesFrom(x, y, moves, nextMoveSlot, takingMoves, nextTMoveSlot);
DiagonalMovesFrom(x, y, moves, nextMoveSlot, takingMoves, nextTMoveSlot);
break;
case BISHOP:
DiagonalMovesFrom(x, y, moves, nextMoveSlot, takingMoves, nextTMoveSlot);
break;
case ROOK:
HorizontalMovesFrom(x, y, moves, nextMoveSlot, takingMoves, nextTMoveSlot);
break;
case KNIGHT:
for(int i = 0; i < 8; i++)
{
int nx = x + kPTC[i][0], ny = y + kPTC[i][1];
if(nx >= 0 && nx < 8 && ny >= 0 && ny < 8)
{
if(!PieceAt(nx, ny))
moves[nextMoveSlot++] = ny * 8 + nx;
else if(PieceColor(nx, ny) != colour)
takingMoves[nextTMoveSlot++] = ny * 8 + nx;
}
}
break;
case PAWN:
if(colour == WHITE)
{
for(int i = 0; i < (y == 6 ? 2 : 1); i++)
if(!PieceAt(x, y - 1 - i))
moves[nextMoveSlot++] = (y - 1 - i) * 8 + x;
else
break;
if(x > 0)
if(PieceAt(x - 1, y - 1) && PieceColor(x - 1, y - 1) != colour)
takingMoves[nextTMoveSlot++] = (y - 1) * 8 + x - 1;
if(x < 7)
if(PieceAt(x + 1, y - 1) && PieceColor(x + 1, y - 1) != colour)
takingMoves[nextTMoveSlot++] = (y - 1) * 8 + x + 1;
}
else
{
for(int i = 0; i < (y == 1 ? 2 : 1); i++)
if(!PieceAt(x, y + 1 + i))
moves[nextMoveSlot++] = (y + 1 + i) * 8 + x;
else
break;
if(x > 0)
if(PieceAt(x - 1, y + 1) && PieceColor(x - 1, y + 1) != colour)
takingMoves[nextTMoveSlot++] = (y + 1) * 8 + x - 1;
if(x < 7)
if(PieceAt(x + 1, y + 1) && PieceColor(x + 1, y + 1) != colour)
takingMoves[nextTMoveSlot++] = (y + 1) * 8 + x + 1;
}
break;
}
}
}
int AddSquareBGTile(uint8_t t[4][64], int pos)
{
for(int i = 0; i < 4; i++)
LoadTile8(1, 1 + (pos * 4) + i, t[i]);
return 1 + (pos * 4);
}
void LoadAssets()
{
SetPaletteObj(0, RGB(0, 0, 0));
for(int i = 0; i < OBJ_PALETTE_SIZE; i++)
SetPaletteObj(1 + i, _objPalette[i]);
SetPaletteBG(0, RGB(0, 0, 0));
for(int i = 0; i < TILE_PALETTE_SIZE; i++)
SetPaletteBG(1 + i, _tilePalette[i]);
int tileCount = 0;
_tileNames[WHITE_TILE] = AddSquareBGTile(_whiteTile, tileCount);
tileCount++;
_tileNames[BLACK_TILE] = AddSquareBGTile(_blackTile, tileCount);
tileCount++;
_tileNames[WHITE_R_TILE] = AddSquareBGTile(_whiteRedTile, tileCount);
tileCount++;
_tileNames[BLACK_R_TILE] = AddSquareBGTile(_blackRedTile, tileCount);
tileCount++;
_tileNames[WHITE_G_TILE] = AddSquareBGTile(_whiteGreenTile, tileCount);
tileCount++;
_tileNames[BLACK_G_TILE] = AddSquareBGTile(_blackGreenTile, tileCount);
tileCount++;
_pieces[WHITE][KING] = AddSquareBGTile(_whiteKingTile, tileCount);
tileCount++;
_pieces[WHITE][QUEEN] = AddSquareBGTile(_whiteQueenTile, tileCount);
tileCount++;
_pieces[WHITE][BISHOP] = AddSquareBGTile(_whiteBishopTile, tileCount);
tileCount++;
_pieces[WHITE][KNIGHT] = AddSquareBGTile(_whiteKnightTile, tileCount);
tileCount++;
_pieces[WHITE][ROOK] = AddSquareBGTile(_whiteRookTile, tileCount);
tileCount++;
_pieces[WHITE][PAWN] = AddSquareBGTile(_whitePawnTile, tileCount);
tileCount++;
_pieces[BLACK][KING] = AddSquareBGTile(_blackKingTile, tileCount);
tileCount++;
_pieces[BLACK][QUEEN] = AddSquareBGTile(_blackQueenTile, tileCount);
tileCount++;
_pieces[BLACK][BISHOP] = AddSquareBGTile(_blackBishopTile, tileCount);
tileCount++;
_pieces[BLACK][KNIGHT] = AddSquareBGTile(_blackKnightTile, tileCount);
tileCount++;
_pieces[BLACK][ROOK] = AddSquareBGTile(_blackRookTile, tileCount);
tileCount++;
_pieces[BLACK][PAWN] = AddSquareBGTile(_blackPawnTile, tileCount);
for(int i = 0; i < 4; i++)
LoadTile8(4, 0 + i, _cursorTile[i]);
for(int i = 0; i < 128; i++)
LoadTile8(0, i, font_bold[i]);
}
void InitialiseStage()
{
REG_DISPCNT = DCNT_MODE0 | DCNT_OBJ | DCNT_OBJ_1D | DCNT_BG0 | DCNT_BG1 | DCNT_BG2 | DCNT_BG3;
REG_BG0CNT = BG_CBB(0) | BG_SBB(30) | BG_8BPP | BG_REG_32x32;
REG_BG1CNT = BG_CBB(1) | BG_SBB(29) | BG_8BPP | BG_REG_32x32;
REG_BG2CNT = BG_CBB(1) | BG_SBB(28) | BG_8BPP | BG_REG_32x32;
REG_BG3CNT = BG_CBB(1) | BG_SBB(27) | BG_8BPP | BG_REG_32x32;
DrawChessBoard();
PlacePieces();
}
bool TileIsWhite(int x, int y)
{
bool t = false;
if(y & 1)
{
if(x & 1)
t = true;
}
else
if(!(x & 1))
t = true;
return t;
}
void DrawFourTilesAt(int x, int y, int sbb, int tileStart)
{
SetTile(sbb, x, y, tileStart);
SetTile(sbb, x + 1, y, tileStart + 1);
SetTile(sbb, x, y + 1, tileStart + 2);
SetTile(sbb, x + 1, y + 1, tileStart + 3);
}
void EraseFourTilesAt(int x, int y, int sbb)
{
SetTile(sbb, x, y, 0);
SetTile(sbb, x + 1, y, 0);
SetTile(sbb, x, y + 1, 0);
SetTile(sbb, x + 1, y + 1, 0);
}
void DrawChessBoard()
{
for(int i = 0; i < 64; i++)
DrawFourTilesAt((i % 8) * 2 + BOARD_OFFSET_X, (i / 8) * 2 + BOARD_OFFSET_Y, 27, (TileIsWhite(i % 8, i / 8) ? _tileNames[WHITE_TILE] : _tileNames[BLACK_TILE]));
}
void PlacePieces()
{
for(int i = 0; i < 8; i++)
for(int j = 0; j < 8; j++)
if(PieceAt(i, j))
DrawFourTilesAt((i * 2) + BOARD_OFFSET_X, (j * 2) + BOARD_OFFSET_Y, 29, _pieces[PieceColor(i, j)][PieceType(i, j)]);
}
void Highlight(int x, int y, int c)
{
int tileToDraw = 0;
if(TileIsWhite(x, y))
{
if(c == RED)
tileToDraw = _tileNames[WHITE_R_TILE];
else if (c == GREEN)
tileToDraw = _tileNames[WHITE_G_TILE];
}
else
{
if(c == RED)
tileToDraw = _tileNames[BLACK_R_TILE];
else if(c == GREEN)
tileToDraw = _tileNames[BLACK_G_TILE];
}
DrawFourTilesAt(x * 2 + BOARD_OFFSET_X, y * 2 + BOARD_OFFSET_Y, 28, tileToDraw);
}
void ClearHighlights()
{
for(int i = 0; i < 16; i++)
for(int j = 0; j < 16; j++)
SetTile(28, i + BOARD_OFFSET_X, j + BOARD_OFFSET_Y, 0);
}
bool PieceAt(int x, int y)
{
return _pieceLayout[y][x] >= 0;
}
int PieceColor(int x, int y)
{
return (_pieceLayout[y][x] > 5 ? BLACK : WHITE);
}
int PieceType(int x, int y)
{
return PieceNames(_pieceLayout[y][x] % 6);
}