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// MIT License, Copyright (c) 2021 Marvin Borner
// Ugly chess implementation to find the limits of libgui
// Asserts are generally not needed but don't hurt either
#include <assert.h>
#include <libgui/gui.h>
#include <print.h>
// Config
#define SIZE 8
#define TILE 36
#define WHITE_STARTS 1
#define DARK_COLOR 0xff946f51
#define LIGHT_COLOR 0xfff0d9b5
#define START_FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"
// Pieces
#define NONE 0
#define KING 1
#define PAWN 2
#define KNIGHT 3
#define BISHOP 5
#define ROOK 6
#define QUEEN 7
#define WHITE 8
#define BLACK 16
// Masks
#define TYPE_MASK 7
#define BLACK_MASK BLACK
#define WHITE_MASK WHITE
#define COLOR_MASK (WHITE_MASK | BLACK_MASK)
// Macros
#define COLOR(piece) (piece & COLOR_MASK)
#define IS_COLOR(piece, color) (COLOR(piece) == color)
#define TYPE(piece) (piece & TYPE_MASK)
#define IS_ROOK_OR_QUEEN(piece) ((piece & 6) == 6)
#define IS_BISHOP_OR_QUEEN(piece) ((piece & 5) == 5)
#define IS_SLIDING_PIECE(piece) ((piece & 4) != 0)
struct piece {
u32 piece;
u32 widget;
char name[8];
struct {
u8 moved : 1;
// idk
} bits;
};
typedef struct piece board[SIZE][SIZE];
static u32 win = 0; // Window
static board tiles = { 0 }; // Matrix
static vec2 selected = { -1, -1 }; // Selected tile
static void load_image(struct piece *tile)
{
char icon[48] = { 0 };
sprintf(icon, "/icons/chess-%s-%d.png", tile->name, TILE);
enum gfx_filter filter = IS_COLOR(tile->piece, BLACK) ? GFX_FILTER_NONE : GFX_FILTER_INVERT;
/* assert(gui_fill(win, tile->widget, GUI_LAYER_FG, 0) == EOK); */
assert(gui_load_image_filter(win, tile->widget, GUI_LAYER_FG, vec2(0, 0), vec2(TILE, TILE),
filter, icon) == EOK);
}
static void mouseclick(u32 widget_id, vec2 pos)
{
UNUSED(pos);
vec2 clicked = vec2(0, 0);
for (u32 x = 0; x < SIZE; x++)
for (u32 y = 0; y < SIZE; y++)
if (tiles[x][y].widget == widget_id)
clicked = vec2(x, y);
struct piece *clicked_piece = &tiles[clicked.x][clicked.y];
if (selected.x != (u32)-1) {
struct piece *selected_piece = &tiles[selected.x][selected.y];
clicked_piece->piece = selected_piece->piece;
selected_piece->piece = 0;
strcpy(clicked_piece->name, selected_piece->name);
selected_piece->name[0] = '\0';
/* assert(gui_fill(win, selected_piece->widget, GUI_LAYER_FG, 0) == EOK); */
load_image(clicked_piece);
assert(gui_redraw_window(win) == EOK);
selected = vec2(-1, -1);
} else if (clicked_piece->piece) {
assert(gui_redraw_widget(win, clicked_piece->widget) == EOK);
selected = clicked;
}
}
static const char *resolve_name(u32 piece, char *buf)
{
const char *name = NULL;
switch (piece & TYPE_MASK) {
case KING:
name = "king";
break;
case PAWN:
name = "pawn";
break;
case KNIGHT:
name = "knight";
break;
case BISHOP:
name = "bishop";
break;
case ROOK:
name = "rook";
break;
case QUEEN:
name = "queen";
break;
default:
err(1, "Unknown piece %d\n", piece);
}
strcpy(buf, name);
return buf;
}
static u32 fen_resolve_letter(char ch)
{
u32 piece = 0;
switch (ch) {
case 'k':
piece = KING | BLACK;
break;
case 'K':
piece = KING | WHITE;
break;
case 'p':
piece = PAWN | BLACK;
break;
case 'P':
piece = PAWN | WHITE;
break;
case 'n':
piece = KNIGHT | BLACK;
break;
case 'N':
piece = KNIGHT | WHITE;
break;
case 'b':
piece = BISHOP | BLACK;
break;
case 'B':
piece = BISHOP | WHITE;
break;
case 'r':
piece = ROOK | BLACK;
break;
case 'R':
piece = ROOK | WHITE;
break;
case 'q':
piece = QUEEN | BLACK;
break;
case 'Q':
piece = QUEEN | WHITE;
break;
default:
err(1, "Invalid letter (%c)!\n", ch);
}
return piece;
}
// TODO: Add more than basic fen support
static void fen_parse(const char *fen)
{
if (!fen || !*fen)
return;
u8 x = 0, y = 0;
for (const char *p = fen; p && *p; p++) {
if (*p == ' ')
break;
if (*p == '/') {
x = 0;
y++;
continue;
}
if (*p >= '0' && *p <= '9')
continue;
u32 piece = fen_resolve_letter(*p);
tiles[x][y].piece = piece;
resolve_name(piece, (char *)&tiles[x][y].name);
x++;
}
}
static void draw_board(void)
{
for (u8 x = 0; x < 8; x++) {
for (u8 y = 0; y < 8; y++) {
u32 widget =
gui_new_widget(win, vec2(TILE, TILE), vec2(TILE * x, TILE * y));
assert((signed)widget > 0);
u8 colored = (x + y + 1) % 2 == 0;
#if !WHITE_STARTS
colored = !colored;
#endif
assert(gui_fill(win, widget, GUI_LAYER_BG,
colored ? DARK_COLOR : LIGHT_COLOR) == EOK);
struct piece *tile = &tiles[x][y];
assert(gui_listen_widget(win, widget, GUI_LISTEN_MOUSECLICK,
(u32)mouseclick) == EOK);
tile->widget = widget;
if (tile->piece)
load_image(tile);
}
}
assert(gui_redraw_window(win) == EOK);
}
int main(void)
{
assert((win = gui_new_window()) > 0);
fen_parse(START_FEN);
draw_board();
gui_loop();
return 0;
}
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