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ChessSDL.cpp
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ChessSDL.cpp
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#ifdef __EMSCRIPTEN__
#include <emscripten.h>
#endif
#include <SDL.h>
#include <SDL_image.h>
#include <iostream>
#include <map>
#include <string>
#include <vector>
#include <memory>
#include <chrono>
#include "ChessSDL.h"
#include "Board.h"
constexpr int depth = 4;
static std::map<std::string, SDL_Texture*> textures;
static SDL_Renderer* renderer;
static SDL_Window* window;
static bool QUIT = false;
bool ChessSDL_NeedToQuit()
{
return QUIT;
}
static SDL_Texture* getTexture(std::string imagePath)
{
return textures[imagePath];
}
static SDL_Renderer* getRenderer()
{
return renderer;
}
static SDL_Window* getWindow()
{
return window;
}
static int init_SDL()
{
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
std::cerr << "SDL could not initialize! SDL_Error: " << SDL_GetError() << std::endl;
return 1;
}
return 0;
}
static int init_SDL_Image()
{
if (!IMG_Init(IMG_INIT_PNG)) {
std::cerr << "SDL_image could not initialize! SDL_image Error: " << IMG_GetError() << std::endl;
SDL_Quit();
return 1;
}
return 0;
}
static SDL_Window* create_SDL_Window(std::string name)
{
SDL_Window* window = SDL_CreateWindow(name.c_str(),
SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
SCREEN_WIDTH, SCREEN_HEIGHT,
SDL_WINDOW_SHOWN);
if (!window) {
std::cerr << "Window could not be created! SDL_Error: " << SDL_GetError() << std::endl;
IMG_Quit();
SDL_Quit();
return nullptr;
}
return window;
}
static SDL_Renderer* create_SDL_Renderer(SDL_Window *window)
{
SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
if (!renderer) {
std::cerr << "Renderer could not be created! SDL_Error: " << SDL_GetError() << std::endl;
SDL_DestroyWindow(window);
IMG_Quit();
SDL_Quit();
return nullptr;
}
return renderer;
}
static bool loadMedia(SDL_Renderer* renderer) {
// Load images for all piece types
std::vector<std::string> Files = {
"../../../images/white-pawn.png",
"../../../images/black-pawn.png",
"../../../images/white-bishop.png",
"../../../images/black-bishop.png",
"../../../images/white-rook.png",
"../../../images/black-rook.png",
"../../../images/white-king.png",
"../../../images/black-king.png",
"../../../images/white-knight.png",
"../../../images/black-knight.png",
"../../../images/white-queen.png",
"../../../images/black-queen.png"
};
for (const auto& file : Files) {
SDL_Surface* loadedSurface = IMG_Load(file.c_str());
if (!loadedSurface) {
std::cerr << "Unable to load image " << file << "! SDL_image Error: " << IMG_GetError() << std::endl;
return false;
}
SDL_Texture* texture = SDL_CreateTextureFromSurface(renderer, loadedSurface);
if (!texture) {
std::cerr << "Unable to create texture from " << file << "! SDL Error: " << SDL_GetError() << std::endl;
SDL_FreeSurface(loadedSurface);
return false;
}
textures[file] = texture;
SDL_FreeSurface(loadedSurface);
}
return true;
}
void ChessSDL_Close()
{
for (auto& pair : textures) {
SDL_DestroyTexture(pair.second);
}
textures.clear();
IMG_Quit();
SDL_Quit();
}
static void ChessSDL_RenderPiece(int row, int col)
{
std::shared_ptr<Board> board = getBoard();
std::shared_ptr<Piece> piece = board->getPiece(row, col);
if (piece) {
std::string imagePath;
imagePath = piece->getImagePath();
SDL_Texture* texture = getTexture(imagePath);
if (texture) {
SDL_Rect pieceRect = { col * TILE_SIZE, row * TILE_SIZE, TILE_SIZE, TILE_SIZE };
SDL_RenderCopy(renderer, texture, nullptr, &pieceRect);
}
}
}
static void ChessSDL_HighlightSelectedTile(SDL_Renderer *renderer, int selectedRow, int selectedCol, bool revert)
{
if (!revert) {
SDL_SetRenderDrawColor(renderer, 255, 255, 130, 255);
} else {
bool isWhiteTile = (selectedRow + selectedCol) % 2 == 0;
if (isWhiteTile) {
SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255); // White
} else {
SDL_SetRenderDrawColor(renderer, 128, 128, 128, 255); // Gray
}
}
SDL_Rect tile = { selectedCol * TILE_SIZE, selectedRow * TILE_SIZE, TILE_SIZE, TILE_SIZE };
SDL_RenderFillRect(renderer, &tile);
ChessSDL_RenderPiece(selectedRow, selectedCol);
}
static void ChessSDL_RenderChessBoard()
{
SDL_Renderer* renderer = getRenderer();
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderClear(renderer);
bool white = true;
for (int row = 0; row < ROWS; ++row) {
for (int col = 0; col < COLS; ++col) {
if (white) {
SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255); // White
} else {
SDL_SetRenderDrawColor(renderer, 128, 128, 128, 255); // Gray
}
SDL_Rect tile = { col * TILE_SIZE, row * TILE_SIZE, TILE_SIZE, TILE_SIZE };
SDL_RenderFillRect(renderer, &tile);
white = !white;
// Render the piece on the board
ChessSDL_RenderPiece(row, col);
}
white = !white;
}
SDL_RenderPresent(renderer);
}
void ChessSDL_HighlightSelection(int selectedRow, int selectedCol, bool revert)
{
ChessSDL_RenderChessBoard();
SDL_Renderer* renderer = getRenderer();
ChessSDL_HighlightSelectedTile(renderer, selectedRow, selectedCol, revert);
SDL_RenderPresent(renderer);
}
static void ChessSDL_HighlightLastMove()
{
ChessSDL_RenderChessBoard();
SDL_Renderer* renderer = getRenderer();
std::shared_ptr<Board> board = getBoard();
Move move = board->getLastMove();
if (move.src_col == -1) return;
ChessSDL_HighlightSelectedTile(renderer, move.src_row, move.src_col, false);
ChessSDL_HighlightSelectedTile(renderer, move.dest_row, move.dest_col, false);
SDL_RenderPresent(renderer);
}
int ChessSDL_MakePreparations()
{
if (init_SDL()) {
return 1;
}
if (init_SDL_Image()) {
return 1;
}
window = create_SDL_Window("OpenChess");
if (!window) {
return 1;
}
renderer = create_SDL_Renderer(window);
if (!renderer) {
return 1;
}
if (!loadMedia(renderer)) {
std::cerr << "Failed to load media!" << std::endl;
ChessSDL_Close();
return 1;
}
ChessSDL_RenderChessBoard();
return 0;
}
static void showCheckmateMessage()
{
std::string winner = (getTurnCounter() % 2 != 0) ? "Player1 (White)" : "Player2 (Black)";
std::string message = "Checkmate! " + winner + " has won the game!";
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "Game Over", message.c_str(), window);
}
static void showStalemateMessage()
{
std::string message = "Stalemate! Game has ended in draw!";
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "Game Over", message.c_str(), window);
}
static void showOpponentPieceMessage()
{
std::string message = "You can't move an opponent's piece!";
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "Warning", message.c_str(), window);
}
static void showInvalidMoveMessage()
{
std::string message = "Invalid move!";
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "Warning", message.c_str(), window);
}
static void showKingInCheckMessage()
{
std::string message = "King is in check! Choose a valid move!";
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "Warning", message.c_str(), window);
}
static void ChessSDL_ShowMoveMessage(MoveResult res)
{
switch (res)
{
case MoveResult::InvalidPiece:
break;
case MoveResult::OpponentPiece:
showOpponentPieceMessage();
break;
case MoveResult::InvalidMove:
showInvalidMoveMessage();
break;
case MoveResult::KingInCheck:
showKingInCheckMessage();
break;
case MoveResult::Checkmate:
showCheckmateMessage();
break;
case MoveResult::Stalemate:
showStalemateMessage();
break;
case MoveResult::ValidMove:
break;
default:
break;
}
}
static bool ChessSDL_HandleMoveResult(const MoveResult& res, const Move& move)
{
bool quit = false;
if (res == MoveResult::InvalidMove || res == MoveResult::KingInCheck) {
ChessSDL_HighlightSelection(move.src_row, move.src_col, true);
} else if (res == MoveResult::Checkmate || res == MoveResult::Stalemate) {
ChessSDL_HighlightLastMove();
quit = true;
} else if (res == MoveResult::ValidMove) {
ChessSDL_HighlightLastMove();
}
ChessSDL_ShowMoveMessage(res);
return quit;
}
static bool ChessSDL_MakeTheMove(Move &move)
{
std::shared_ptr<Board> board = getBoard();
MoveResult res = board->move(move);
if (res == MoveResult::ValidMove) {
res = board->evaluateGameState(move);
}
return ChessSDL_HandleMoveResult(res, move);
}
static int handleFirstClick(Move &move, int row, int col, bool &isPieceSelected)
{
std::shared_ptr<Board> board = getBoard();
if (!isPieceSelected) {
auto selectedPiece = board->getPiece(row, col);
if (selectedPiece && selectedPiece->getColor() == getCurrentPlayerColor()) {
isPieceSelected = true;
move.src_row = row;
move.src_col = col;
ChessSDL_HighlightSelection(row, col, false);
return 1;
}
}
return 0;
}
static int handleSecondClick(Move &move, int row, int col, bool &isPieceSelected)
{
if (isPieceSelected) {
isPieceSelected = false;
move.dest_row = row;
move.dest_col = col;
return 1;
}
return 0;
}
void ChessSDL_GameLoopIteration()
{
SDL_Event e;
static bool isPieceSelected = false;
static Move move{ 0 };
if (getTurnCounter() % 2 == 0 && !QUIT) {
auto start = std::chrono::high_resolution_clock::now();
Move aiMove = findBestMove(depth);
auto end = std::chrono::high_resolution_clock::now();
std::chrono::duration<double> elapsed = end - start;
double calculationTime = elapsed.count();
if (calculationTime < 0.5) {
SDL_Delay(500);
}
QUIT = ChessSDL_MakeTheMove(aiMove);
if (QUIT) {
#ifdef __EMSCRIPTEN__
emscripten_cancel_main_loop();
#endif
}
}
while (SDL_PollEvent(&e) != 0) {
if (e.type == SDL_QUIT) {
QUIT = true;
#ifdef __EMSCRIPTEN__
emscripten_cancel_main_loop();
#endif
} else if (e.type == SDL_MOUSEBUTTONDOWN) {
int x, y;
SDL_GetMouseState(&x, &y);
int row = y / TILE_SIZE;
int col = x / TILE_SIZE;
if (handleFirstClick(move, row, col, isPieceSelected) == 0) {
if (handleSecondClick(move, row, col, isPieceSelected)) {
QUIT = ChessSDL_MakeTheMove(move);
if (QUIT) {
#ifdef __EMSCRIPTEN__
emscripten_cancel_main_loop();
#endif
}
}
}
} else if (e.type == SDL_KEYDOWN && e.key.keysym.sym == SDLK_ESCAPE) {
if (isPieceSelected) {
ChessSDL_HighlightSelection(move.src_row, move.src_col, true);
isPieceSelected = false;
}
}
}
}