chess_board_sim/chess_board.cpp

#include "chess_board.h"
#include <SDL.h>
#include <SDL_video.h>
#include "stdio.h"
#include <stack>
#include <string.h>

#define MARGIN 200

#define PAWN_WHITE      0u
#define PAWN_BLACK      1u
#define KING_WHITE      2u
#define KING_BLACK      3u
#define QUEEN_WHITE     4u
#define QUEEN_BLACK     5u
#define ROOK_WHITE      6u
#define ROOK_BLACK      7u
#define KNIGHT_WHITE    8u
#define KNIGHT_BLACK    9u
#define BISHOP_WHITE    10u
#define BISHOP_BLACK    11u
#define SQUARE_EMPTY    12u
#define SQUARE_SHIFT    4u

#define POTENTIAL_MOVE  (1u << SQUARE_SHIFT)
#define POTENTIAL_TAKE  (2u << SQUARE_SHIFT)
#define SUGGESTED_MOVE  (3u << SQUARE_SHIFT)
#define CHEATING_MOVE   (4u << SQUARE_SHIFT)

const char file_names[12][16] = {"pawn_white.bmp", "pawn_black.bmp",
                                    "king_white.bmp", "king_black.bmp",
                                    "queen_white.bmp", "queen_black.bmp",
                                    "rook_white.bmp", "rook_black.bmp",
                                    "horse_white.bmp", "horse_black.bmp",
                                    "tower_white.bmp", "tower_black.bmp"};

static int height;
static int width;
static SDL_Texture * board_texture;
static SDL_Rect rectangle;
static int board_width;
uint8_t board_state[8][8];
SDL_Surface *bitmapSurface = NULL;
SDL_Texture * bitmapTextures[12] = {NULL};
std::stack<uint8_t> selected_peices;

void pawn_move(uint8_t row, uint8_t column)
{
    if((0x0Fu & board_state[row][column]) == SQUARE_EMPTY)
    {
        board_state[row][column] = (uint8_t)((POTENTIAL_MOVE) | (board_state[row][column] & 0x0Fu));
    }
}

void pawn_take(uint8_t row, uint8_t column)
{
    if ((0x0Fu & board_state[row][column]) < SQUARE_EMPTY)
    {
        board_state[row][column] = (uint8_t)((POTENTIAL_TAKE) | (board_state[row][column] & 0x0Fu));
    }
}

void Mark_Potential_Moves(uint8_t peice, uint8_t column, uint8_t row)
{
    switch (peice)
    {
        case PAWN_WHITE :
            if (row == 6)
            {
                pawn_move(row - 2, column);
            }
            pawn_move(row - 1, column);
            if(column >= 1)
            {
                pawn_take(row - 1, column - 1);
            }
            if (column <= 6)
            {
                pawn_take(row - 1, column + 1);
            }
            
            break;
        case PAWN_BLACK:
            if (row == 1)
            {
                board_state[row + 2][column] = (uint8_t)((POTENTIAL_MOVE) | (board_state[row + 2][column] & 0x0Fu));
            }
            board_state[row + 1][column] = (uint8_t)((uint8_t)(POTENTIAL_MOVE) | (uint8_t)(board_state[row + 1][column] & 0x0Fu));
            break;
        case ROOK_WHITE:
        case ROOK_BLACK:
            break;  

        default:
            break;
    }
}

bool click(SDL_Renderer *p_renderer, int x, int y, bool pick_up)
{
    SDL_Point const point = {x, y};
    bool ret_val = false;
    rectangle.w = board_width;
    rectangle.h = board_width;
    rectangle.x = (width - board_width) / 2;
    rectangle.y = (height - board_width) / 2;
    if (SDL_PointInRect(&point, &rectangle))
    {
        int square_size = board_width / 8;
        int starting_x = rectangle.x;
        rectangle.w = square_size;
        rectangle.h = square_size;
        for (size_t j = 0; j < 8; j++)
        {
            rectangle.x = starting_x;
            for (size_t i = 0; i < 8; i++)
            {
                if(SDL_PointInRect(&point, &rectangle))
                {
                    if (pick_up && (board_state[j][i] < SQUARE_EMPTY))
                    {
                        selected_peices.push(board_state[j][i]);
                        Mark_Potential_Moves(board_state[j][i], i, j);
                        board_state[j][i] = SQUARE_EMPTY;
                    }
                    else if (!selected_peices.empty() && (board_state[j][i] >= SQUARE_EMPTY))
                    {
                        board_state[j][i] = selected_peices.top();
                        selected_peices.pop();
                    }
                    else
                    {
                        /* code */
                    }
            
                    goto draw_square;
                }
                rectangle.x += square_size;
            }
            rectangle.y += square_size;
        }
        draw_square:
        SDL_SetRenderTarget(p_renderer, board_texture);
        //SDL_SetRenderDrawColor(p_renderer, 0x00, 0xFF, 0x00, 0x00);
        //SDL_RenderDrawRect(p_renderer, &rectangle);
        //SDL_RenderFillRect(p_renderer, &rectangle);
        //SDL_SetRenderTarget(p_renderer, NULL);
        draw_board(p_renderer);
        SDL_RenderCopy(p_renderer, board_texture, NULL, NULL);
        SDL_RenderPresent(p_renderer);
    }
    return ret_val;
}

void chess_board_resize(SDL_Renderer *p_renderer, int w, int h)
{
    width = w;
    height = h;
    SDL_DestroyTexture(board_texture);
    board_texture = SDL_CreateTexture(p_renderer, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, w, h);
    board_width = ((w > h) ? h : w) - MARGIN;
    // get rid of rounding errors
    board_width -= board_width % 8;
}

void chess_board_init(SDL_Renderer *p_renderer)
{   
    for (uint8_t i = 0; i < 8; i++)
    {
        for (uint8_t j = 0; j < 8; j++)
        {
            board_state[i][j] = SQUARE_EMPTY;
        }
        
    }
    
    //Place black peices
    board_state[0][0] = BISHOP_BLACK;
    board_state[0][7] = BISHOP_BLACK;
    board_state[0][1] = KNIGHT_BLACK;
    board_state[0][6] = KNIGHT_BLACK;
    board_state[0][2] = ROOK_BLACK;
    board_state[0][5] = ROOK_BLACK;
    board_state[0][3] = QUEEN_BLACK;
    board_state[0][4] = KING_BLACK;
    board_state[7][0] = BISHOP_WHITE;
    board_state[7][7] = BISHOP_WHITE;
    board_state[7][1] = KNIGHT_WHITE;
    board_state[7][6] = KNIGHT_WHITE;
    board_state[7][2] = ROOK_WHITE;
    board_state[7][5] = ROOK_WHITE;
    board_state[7][3] = QUEEN_WHITE;
    board_state[7][4] = KING_WHITE;
    for (uint8_t i = 0; i < 8; i++)
    {
        board_state[1][i] = PAWN_BLACK;
        board_state[6][i] = PAWN_WHITE;
    }
    for (uint8_t i = 0; i < 12; i++)
    {
        //location of all the sprites plus the size of file names
        char file[25] = "sprites\\";
        memcpy(&file[8], file_names[i], 16);
        bitmapSurface = SDL_LoadBMP(file);
        bitmapTextures[i] = SDL_CreateTextureFromSurface(p_renderer, bitmapSurface);
    }
    SDL_FreeSurface(bitmapSurface);
}

void draw_board(SDL_Renderer *p_renderer)
{
    SDL_SetRenderTarget(p_renderer, board_texture);
    SDL_SetRenderDrawColor(p_renderer, 0x7f, 0x7f, 0x7f, 0);
    SDL_RenderClear(p_renderer);
    SDL_RenderDrawRect(p_renderer, &rectangle);
    SDL_SetRenderDrawColor(p_renderer, 0xFF, 0xFF, 0xFF, 0x00);
    rectangle.w = board_width;
    rectangle.h = board_width;
    rectangle.x = (width - board_width) / 2;
    rectangle.y = (height - board_width) / 2;
    SDL_RenderFillRect(p_renderer, &rectangle);
    SDL_SetRenderDrawColor(p_renderer, 0x85, 0x5E, 0x42, 0x00);
    int square_size = board_width / 8;
    int starting_x = rectangle.x;
    rectangle.w = square_size;
    rectangle.h = square_size;
    for (size_t j = 0; j < 8; j++)
    {
        rectangle.x = starting_x;
        for (size_t i = 0; i < 8; i++)
        {
            if((board_state[j][i] & 0xF0u) == POTENTIAL_MOVE)
            {
                SDL_SetRenderDrawColor(p_renderer, 0x00, 0xFF, 0x00, 0x00);
                SDL_RenderFillRect(p_renderer, &rectangle);
                SDL_SetRenderDrawColor(p_renderer, 0x85, 0x5E, 0x42, 0x00);
            }
            else if ((board_state[j][i] & 0xF0u) == POTENTIAL_TAKE)
            {
                SDL_SetRenderDrawColor(p_renderer, 0xFF, 0x00, 0x00, 0x00);
                SDL_RenderFillRect(p_renderer, &rectangle);
                SDL_SetRenderDrawColor(p_renderer, 0x85, 0x5E, 0x42, 0x00);
            }
            else if (((i % 2) + (j % 2))  == 1)
            {
                SDL_RenderFillRect(p_renderer, &rectangle);
            }
            else
            {
                /* code */
            }
            
            if((board_state[j][i] & 0x0Fu) != SQUARE_EMPTY)
            {
                SDL_RenderCopy(p_renderer, bitmapTextures[(board_state[j][i] & 0x0Fu)], NULL, &rectangle);
            }

            rectangle.x += square_size;
        }
        rectangle.y += square_size;
    }
    
    SDL_SetRenderTarget(p_renderer, NULL);
    SDL_RenderCopy(p_renderer, board_texture, NULL, NULL);
}