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blackbox.c
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blackbox.c
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/*
* blackbox.c: implementation of 'Black Box'.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <ctype.h>
#ifdef NO_TGMATH_H
# include <math.h>
#else
# include <tgmath.h>
#endif
#include "puzzles.h"
#define PREFERRED_TILE_SIZE 32
#define FLASH_FRAME 0.2F
/* Terminology, for ease of reading various macros scattered about the place.
*
* The 'arena' is the inner area where the balls are placed. This is
* indexed from (0,0) to (w-1,h-1) but its offset in the grid is (1,1).
*
* The 'range' (firing range) is the bit around the edge where
* the lasers are fired from. This is indexed from 0 --> (2*(w+h) - 1),
* starting at the top left ((1,0) on the grid) and moving clockwise.
*
* The 'grid' is just the big array containing arena and range;
* locations (0,0), (0,w+1), (h+1,w+1) and (h+1,0) are unused.
*/
enum {
COL_BACKGROUND, COL_COVER, COL_LOCK,
COL_TEXT, COL_FLASHTEXT,
COL_HIGHLIGHT, COL_LOWLIGHT, COL_GRID,
COL_BALL, COL_WRONG, COL_BUTTON,
COL_CURSOR,
NCOLOURS
};
struct game_params {
int w, h;
int minballs, maxballs;
};
static game_params *default_params(void)
{
game_params *ret = snew(game_params);
ret->w = ret->h = 8;
ret->minballs = ret->maxballs = 5;
return ret;
}
static const game_params blackbox_presets[] = {
{ 5, 5, 3, 3 },
{ 8, 8, 5, 5 },
{ 8, 8, 3, 6 },
{ 10, 10, 5, 5 },
{ 10, 10, 4, 10 }
};
static bool game_fetch_preset(int i, char **name, game_params **params)
{
char str[80];
game_params *ret;
if (i < 0 || i >= lenof(blackbox_presets))
return false;
ret = snew(game_params);
*ret = blackbox_presets[i];
if (ret->minballs == ret->maxballs)
sprintf(str, "%dx%d, %d balls",
ret->w, ret->h, ret->minballs);
else
sprintf(str, "%dx%d, %d-%d balls",
ret->w, ret->h, ret->minballs, ret->maxballs);
*name = dupstr(str);
*params = ret;
return true;
}
static void free_params(game_params *params)
{
sfree(params);
}
static game_params *dup_params(const game_params *params)
{
game_params *ret = snew(game_params);
*ret = *params; /* structure copy */
return ret;
}
static void decode_params(game_params *params, char const *string)
{
char const *p = string;
game_params *defs = default_params();
*params = *defs; free_params(defs);
while (*p) {
switch (*p++) {
case 'w':
params->w = atoi(p);
while (*p && isdigit((unsigned char)*p)) p++;
break;
case 'h':
params->h = atoi(p);
while (*p && isdigit((unsigned char)*p)) p++;
break;
case 'm':
params->minballs = atoi(p);
while (*p && isdigit((unsigned char)*p)) p++;
break;
case 'M':
params->maxballs = atoi(p);
while (*p && isdigit((unsigned char)*p)) p++;
break;
default:
;
}
}
}
static char *encode_params(const game_params *params, bool full)
{
char str[256];
sprintf(str, "w%dh%dm%dM%d",
params->w, params->h, params->minballs, params->maxballs);
return dupstr(str);
}
static config_item *game_configure(const game_params *params)
{
config_item *ret;
char buf[80];
ret = snewn(4, config_item);
ret[0].name = "Width";
ret[0].type = C_STRING;
sprintf(buf, "%d", params->w);
ret[0].u.string.sval = dupstr(buf);
ret[1].name = "Height";
ret[1].type = C_STRING;
sprintf(buf, "%d", params->h);
ret[1].u.string.sval = dupstr(buf);
ret[2].name = "No. of balls";
ret[2].type = C_STRING;
if (params->minballs == params->maxballs)
sprintf(buf, "%d", params->minballs);
else
sprintf(buf, "%d-%d", params->minballs, params->maxballs);
ret[2].u.string.sval = dupstr(buf);
ret[3].name = NULL;
ret[3].type = C_END;
return ret;
}
static game_params *custom_params(const config_item *cfg)
{
game_params *ret = snew(game_params);
ret->w = atoi(cfg[0].u.string.sval);
ret->h = atoi(cfg[1].u.string.sval);
/* Allow 'a-b' for a range, otherwise assume a single number. */
if (sscanf(cfg[2].u.string.sval, "%d-%d",
&ret->minballs, &ret->maxballs) < 2)
ret->minballs = ret->maxballs = atoi(cfg[2].u.string.sval);
return ret;
}
static const char *validate_params(const game_params *params, bool full)
{
if (params->w < 2 || params->h < 2)
return "Width and height must both be at least two";
/* next one is just for ease of coding stuff into 'char'
* types, and could be worked around if required. */
if (params->w > 255 || params->h > 255)
return "Widths and heights greater than 255 are not supported";
if (params->minballs < 0)
return "Negative number of balls";
if (params->minballs > params->maxballs)
return "Minimum number of balls may not be greater than maximum";
if (params->minballs >= params->w * params->h)
return "Too many balls to fit in grid";
return NULL;
}
/*
* We store: width | height | ball1x | ball1y | [ ball2x | ball2y | [...] ]
* all stored as unsigned chars; validate_params has already
* checked this won't overflow an 8-bit char.
* Then we obfuscate it.
*/
static char *new_game_desc(const game_params *params, random_state *rs,
char **aux, bool interactive)
{
int nballs = params->minballs, i;
char *grid, *ret;
unsigned char *bmp;
if (params->maxballs > params->minballs)
nballs += random_upto(rs, params->maxballs - params->minballs + 1);
grid = snewn(params->w*params->h, char);
memset(grid, 0, params->w * params->h * sizeof(char));
bmp = snewn(nballs*2 + 2, unsigned char);
memset(bmp, 0, (nballs*2 + 2) * sizeof(unsigned char));
bmp[0] = params->w;
bmp[1] = params->h;
for (i = 0; i < nballs; i++) {
int x, y;
do {
x = random_upto(rs, params->w);
y = random_upto(rs, params->h);
} while (grid[y*params->w + x]);
grid[y*params->w + x] = 1;
bmp[(i+1)*2 + 0] = x;
bmp[(i+1)*2 + 1] = y;
}
sfree(grid);
obfuscate_bitmap(bmp, (nballs*2 + 2) * 8, false);
ret = bin2hex(bmp, nballs*2 + 2);
sfree(bmp);
return ret;
}
static const char *validate_desc(const game_params *params, const char *desc)
{
int nballs, dlen = strlen(desc), i;
unsigned char *bmp;
const char *ret;
/* the bitmap is 2+(nballs*2) long; the hex version is double that. */
nballs = ((dlen/2)-2)/2;
if (dlen < 4 || dlen % 4 ||
nballs < params->minballs || nballs > params->maxballs)
return "Game description is wrong length";
bmp = hex2bin(desc, nballs*2 + 2);
obfuscate_bitmap(bmp, (nballs*2 + 2) * 8, true);
ret = "Game description is corrupted";
/* check general grid size */
if (bmp[0] != params->w || bmp[1] != params->h)
goto done;
/* check each ball will fit on that grid */
for (i = 0; i < nballs; i++) {
int x = bmp[(i+1)*2 + 0], y = bmp[(i+1)*2 + 1];
if (x < 0 || y < 0 || x >= params->w || y >= params->h)
goto done;
}
ret = NULL;
done:
sfree(bmp);
return ret;
}
#define BALL_CORRECT 0x01
#define BALL_GUESS 0x02
#define BALL_LOCK 0x04
#define LASER_FLAGMASK 0x1f800
#define LASER_OMITTED 0x0800
#define LASER_REFLECT 0x1000
#define LASER_HIT 0x2000
#define LASER_WRONG 0x4000
#define LASER_FLASHED 0x8000
#define LASER_EMPTY (~0)
#define FLAG_CURSOR 0x10000 /* needs to be disjoint from both sets */
struct game_state {
int w, h, minballs, maxballs, nballs, nlasers;
unsigned int *grid; /* (w+2)x(h+2), to allow for laser firing range */
unsigned int *exits; /* one per laser */
bool done; /* user has finished placing his own balls. */
int laserno; /* number of next laser to be fired. */
int nguesses, nright, nwrong, nmissed;
bool reveal, justwrong;
};
#define GRID(s,x,y) ((s)->grid[(y)*((s)->w+2) + (x)])
#define RANGECHECK(s,x) ((x) >= 0 && (x) < (s)->nlasers)
/* specify numbers because they must match array indexes. */
enum { DIR_UP = 0, DIR_RIGHT = 1, DIR_DOWN = 2, DIR_LEFT = 3 };
struct offset { int x, y; };
static const struct offset offsets[] = {
{ 0, -1 }, /* up */
{ 1, 0 }, /* right */
{ 0, 1 }, /* down */
{ -1, 0 } /* left */
};
#ifdef DEBUGGING
static const char *dirstrs[] = {
"UP", "RIGHT", "DOWN", "LEFT"
};
#endif
static bool range2grid(const game_state *state, int rangeno, int *x, int *y,
int *direction)
{
if (rangeno < 0)
return false;
if (rangeno < state->w) {
/* top row; from (1,0) to (w,0) */
*x = rangeno + 1;
*y = 0;
*direction = DIR_DOWN;
return true;
}
rangeno -= state->w;
if (rangeno < state->h) {
/* RHS; from (w+1, 1) to (w+1, h) */
*x = state->w+1;
*y = rangeno + 1;
*direction = DIR_LEFT;
return true;
}
rangeno -= state->h;
if (rangeno < state->w) {
/* bottom row; from (1, h+1) to (w, h+1); counts backwards */
*x = (state->w - rangeno);
*y = state->h+1;
*direction = DIR_UP;
return true;
}
rangeno -= state->w;
if (rangeno < state->h) {
/* LHS; from (0, 1) to (0, h); counts backwards */
*x = 0;
*y = (state->h - rangeno);
*direction = DIR_RIGHT;
return true;
}
return false;
}
static bool grid2range(const game_state *state, int x, int y, int *rangeno)
{
int ret, x1 = state->w+1, y1 = state->h+1;
if (x > 0 && x < x1 && y > 0 && y < y1) return false; /* in arena */
if (x < 0 || x > x1 || y < 0 || y > y1) return false; /* outside grid */
if ((x == 0 || x == x1) && (y == 0 || y == y1))
return false; /* one of 4 corners */
if (y == 0) { /* top line */
ret = x - 1;
} else if (x == x1) { /* RHS */
ret = y - 1 + state->w;
} else if (y == y1) { /* Bottom [and counts backwards] */
ret = (state->w - x) + state->w + state->h;
} else { /* LHS [and counts backwards ] */
ret = (state->h-y) + state->w + state->w + state->h;
}
*rangeno = ret;
debug(("grid2range: (%d,%d) rangeno = %d\n", x, y, ret));
return true;
}
static game_state *new_game(midend *me, const game_params *params,
const char *desc)
{
game_state *state = snew(game_state);
int dlen = strlen(desc), i;
unsigned char *bmp;
state->minballs = params->minballs;
state->maxballs = params->maxballs;
state->nballs = ((dlen/2)-2)/2;
bmp = hex2bin(desc, state->nballs*2 + 2);
obfuscate_bitmap(bmp, (state->nballs*2 + 2) * 8, true);
state->w = bmp[0]; state->h = bmp[1];
state->nlasers = 2 * (state->w + state->h);
state->grid = snewn((state->w+2)*(state->h+2), unsigned int);
memset(state->grid, 0, (state->w+2)*(state->h+2) * sizeof(unsigned int));
state->exits = snewn(state->nlasers, unsigned int);
memset(state->exits, LASER_EMPTY, state->nlasers * sizeof(unsigned int));
for (i = 0; i < state->nballs; i++) {
GRID(state, bmp[(i+1)*2 + 0]+1, bmp[(i+1)*2 + 1]+1) = BALL_CORRECT;
}
sfree(bmp);
state->done = false;
state->justwrong = false;
state->reveal = false;
state->nguesses = state->nright = state->nwrong = state->nmissed = 0;
state->laserno = 1;
return state;
}
#define XFER(x) ret->x = state->x
static game_state *dup_game(const game_state *state)
{
game_state *ret = snew(game_state);
XFER(w); XFER(h);
XFER(minballs); XFER(maxballs);
XFER(nballs); XFER(nlasers);
ret->grid = snewn((ret->w+2)*(ret->h+2), unsigned int);
memcpy(ret->grid, state->grid, (ret->w+2)*(ret->h+2) * sizeof(unsigned int));
ret->exits = snewn(ret->nlasers, unsigned int);
memcpy(ret->exits, state->exits, ret->nlasers * sizeof(unsigned int));
XFER(done);
XFER(laserno);
XFER(nguesses);
XFER(reveal);
XFER(justwrong);
XFER(nright); XFER(nwrong); XFER(nmissed);
return ret;
}
#undef XFER
static void free_game(game_state *state)
{
sfree(state->exits);
sfree(state->grid);
sfree(state);
}
static char *solve_game(const game_state *state, const game_state *currstate,
const char *aux, const char **error)
{
return dupstr("S");
}
struct game_ui {
int flash_laserno;
int errors;
bool newmove;
int cur_x, cur_y;
bool cur_visible;
int flash_laser; /* 0 = never, 1 = always, 2 = if anim. */
};
static game_ui *new_ui(const game_state *state)
{
game_ui *ui = snew(game_ui);
ui->flash_laserno = LASER_EMPTY;
ui->errors = 0;
ui->newmove = false;
ui->cur_x = ui->cur_y = 1;
ui->cur_visible = getenv_bool("PUZZLES_SHOW_CURSOR", false);
ui->flash_laser = 0;
return ui;
}
static void free_ui(game_ui *ui)
{
sfree(ui);
}
static char *encode_ui(const game_ui *ui)
{
char buf[80];
/*
* The error counter needs preserving across a serialisation.
*/
sprintf(buf, "E%d", ui->errors);
return dupstr(buf);
}
static void decode_ui(game_ui *ui, const char *encoding,
const game_state *state)
{
sscanf(encoding, "E%d", &ui->errors);
}
static void game_changed_state(game_ui *ui, const game_state *oldstate,
const game_state *newstate)
{
/*
* If we've encountered a `justwrong' state as a result of
* actually making a move, increment the ui error counter.
*/
if (newstate->justwrong && ui->newmove)
ui->errors++;
ui->newmove = false;
}
static const char *current_key_label(const game_ui *ui,
const game_state *state, int button)
{
if (IS_CURSOR_SELECT(button) && ui->cur_visible && !state->reveal) {
int gx = ui->cur_x, gy = ui->cur_y, rangeno = -1;
if (gx == 0 && gy == 0 && button == CURSOR_SELECT) return "Check";
if (gx >= 1 && gx <= state->w && gy >= 1 && gy <= state->h) {
/* Cursor somewhere in the arena. */
if (button == CURSOR_SELECT && !(GRID(state, gx,gy) & BALL_LOCK))
return (GRID(state, gx, gy) & BALL_GUESS) ? "Clear" : "Ball";
if (button == CURSOR_SELECT2)
return (GRID(state, gx, gy) & BALL_LOCK) ? "Unlock" : "Lock";
}
if (grid2range(state, gx, gy, &rangeno)) {
if (button == CURSOR_SELECT &&
state->exits[rangeno] == LASER_EMPTY)
return "Fire";
if (button == CURSOR_SELECT2) {
int n = 0;
/* Row or column lock or unlock. */
if (gy == 0 || gy > state->h) { /* Column lock */
for (gy = 1; gy <= state->h; gy++)
n += !!(GRID(state, gx, gy) & BALL_LOCK);
return n > state->h/2 ? "Unlock" : "Lock";
} else { /* Row lock */
for (gx = 1; gx <= state->w; gx++)
n += !!(GRID(state, gx, gy) & BALL_LOCK);
return n > state->w/2 ? "Unlock" : "Lock";
}
}
}
}
return "";
}
#define OFFSET(gx,gy,o) do { \
int off = (4 + (o) % 4) % 4; \
(gx) += offsets[off].x; \
(gy) += offsets[off].y; \
} while(0)
enum { LOOK_LEFT, LOOK_FORWARD, LOOK_RIGHT };
/* Given a position and a direction, check whether we can see a ball in front
* of us, or to our front-left or front-right. */
static bool isball(game_state *state, int gx, int gy, int direction, int lookwhere)
{
debug(("isball, (%d, %d), dir %s, lookwhere %s\n", gx, gy, dirstrs[direction],
lookwhere == LOOK_LEFT ? "LEFT" :
lookwhere == LOOK_FORWARD ? "FORWARD" : "RIGHT"));
OFFSET(gx,gy,direction);
if (lookwhere == LOOK_LEFT)
OFFSET(gx,gy,direction-1);
else if (lookwhere == LOOK_RIGHT)
OFFSET(gx,gy,direction+1);
else if (lookwhere != LOOK_FORWARD)
assert(!"unknown lookwhere");
debug(("isball, new (%d, %d)\n", gx, gy));
/* if we're off the grid (into the firing range) there's never a ball. */
if (gx < 1 || gy < 1 || gx > state->w || gy > state->h)
return false;
if (GRID(state, gx,gy) & BALL_CORRECT)
return true;
return false;
}
static int fire_laser_internal(game_state *state, int x, int y, int direction)
{
int unused, lno;
bool tmp;
tmp = grid2range(state, x, y, &lno);
assert(tmp);
/* deal with strange initial reflection rules (that stop
* you turning down the laser range) */
/* I've just chosen to prioritise instant-hit over instant-reflection;
* I can't find anywhere that gives me a definite algorithm for this. */
if (isball(state, x, y, direction, LOOK_FORWARD)) {
debug(("Instant hit at (%d, %d)\n", x, y));
return LASER_HIT; /* hit */
}
if (isball(state, x, y, direction, LOOK_LEFT) ||
isball(state, x, y, direction, LOOK_RIGHT)) {
debug(("Instant reflection at (%d, %d)\n", x, y));
return LASER_REFLECT; /* reflection */
}
/* move us onto the grid. */
OFFSET(x, y, direction);
while (1) {
debug(("fire_laser: looping at (%d, %d) pointing %s\n",
x, y, dirstrs[direction]));
if (grid2range(state, x, y, &unused)) {
int exitno;
tmp = grid2range(state, x, y, &exitno);
assert(tmp);
return (lno == exitno ? LASER_REFLECT : exitno);
}
/* paranoia. This obviously should never happen */
assert(!(GRID(state, x, y) & BALL_CORRECT));
if (isball(state, x, y, direction, LOOK_FORWARD)) {
/* we're facing a ball; send back a reflection. */
debug(("Ball ahead of (%d, %d)", x, y));
return LASER_HIT; /* hit */
}
if (isball(state, x, y, direction, LOOK_LEFT)) {
/* ball to our left; rotate clockwise and look again. */
debug(("Ball to left; turning clockwise.\n"));
direction += 1; direction %= 4;
continue;
}
if (isball(state, x, y, direction, LOOK_RIGHT)) {
/* ball to our right; rotate anti-clockwise and look again. */
debug(("Ball to rightl turning anti-clockwise.\n"));
direction += 3; direction %= 4;
continue;
}
/* ... otherwise, we have no balls ahead of us so just move one step. */
debug(("No balls; moving forwards.\n"));
OFFSET(x, y, direction);
}
}
static int laser_exit(game_state *state, int entryno)
{
int x, y, direction;
bool tmp;
tmp = range2grid(state, entryno, &x, &y, &direction);
assert(tmp);
return fire_laser_internal(state, x, y, direction);
}
static void fire_laser(game_state *state, int entryno)
{
int exitno, x, y, direction;
bool tmp;
tmp = range2grid(state, entryno, &x, &y, &direction);
assert(tmp);
exitno = fire_laser_internal(state, x, y, direction);
if (exitno == LASER_HIT || exitno == LASER_REFLECT) {
GRID(state, x, y) = state->exits[entryno] = exitno;
} else {
int newno = state->laserno++;
int xend, yend, unused;
tmp = range2grid(state, exitno, &xend, ¥d, &unused);
assert(tmp);
GRID(state, x, y) = GRID(state, xend, yend) = newno;
state->exits[entryno] = exitno;
state->exits[exitno] = entryno;
}
}
/* Checks that the guessed balls in the state match up with the real balls
* for all possible lasers (i.e. not just the ones that the player might
* have already guessed). This is required because any layout with >4 balls
* might have multiple valid solutions. Returns non-zero for a 'correct'
* (i.e. consistent) layout. */
static int check_guesses(game_state *state, bool cagey)
{
game_state *solution, *guesses;
int i, x, y, n, unused, tmp;
bool tmpb;
int ret = 0;
if (cagey) {
/*
* First, check that each laser the player has already
* fired is consistent with the layout. If not, show them
* one error they've made and reveal no further
* information.
*
* Failing that, check to see whether the player would have
* been able to fire any laser which distinguished the real
* solution from their guess. If so, show them one such
* laser and reveal no further information.
*/
guesses = dup_game(state);
/* clear out BALL_CORRECT on guess, make BALL_GUESS BALL_CORRECT. */
for (x = 1; x <= state->w; x++) {
for (y = 1; y <= state->h; y++) {
GRID(guesses, x, y) &= ~BALL_CORRECT;
if (GRID(guesses, x, y) & BALL_GUESS)
GRID(guesses, x, y) |= BALL_CORRECT;
}
}
n = 0;
for (i = 0; i < guesses->nlasers; i++) {
if (guesses->exits[i] != LASER_EMPTY &&
guesses->exits[i] != laser_exit(guesses, i))
n++;
}
if (n) {
/*
* At least one of the player's existing lasers
* contradicts their ball placement. Pick a random one,
* highlight it, and return.
*
* A temporary random state is created from the current
* grid, so that repeating the same marking will give
* the same answer instead of a different one.
*/
random_state *rs = random_new((char *)guesses->grid,
(state->w+2)*(state->h+2) *
sizeof(unsigned int));
n = random_upto(rs, n);
random_free(rs);
for (i = 0; i < guesses->nlasers; i++) {
if (guesses->exits[i] != LASER_EMPTY &&
guesses->exits[i] != laser_exit(guesses, i) &&
n-- == 0) {
state->exits[i] |= LASER_WRONG;
tmp = laser_exit(state, i);
if (RANGECHECK(state, tmp))
state->exits[tmp] |= LASER_WRONG;
state->justwrong = true;
free_game(guesses);
return 0;
}
}
}
n = 0;
for (i = 0; i < guesses->nlasers; i++) {
if (guesses->exits[i] == LASER_EMPTY &&
laser_exit(state, i) != laser_exit(guesses, i))
n++;
}
if (n) {
/*
* At least one of the player's unfired lasers would
* demonstrate their ball placement to be wrong. Pick a
* random one, highlight it, and return.
*
* A temporary random state is created from the current
* grid, so that repeating the same marking will give
* the same answer instead of a different one.
*/
random_state *rs = random_new((char *)guesses->grid,
(state->w+2)*(state->h+2) *
sizeof(unsigned int));
n = random_upto(rs, n);
random_free(rs);
for (i = 0; i < guesses->nlasers; i++) {
if (guesses->exits[i] == LASER_EMPTY &&
laser_exit(state, i) != laser_exit(guesses, i) &&
n-- == 0) {
fire_laser(state, i);
state->exits[i] |= LASER_OMITTED;
tmp = laser_exit(state, i);
if (RANGECHECK(state, tmp))
state->exits[tmp] |= LASER_OMITTED;
state->justwrong = true;
free_game(guesses);
return 0;
}
}
}
free_game(guesses);
}
/* duplicate the state (to solution) */
solution = dup_game(state);
/* clear out the lasers of solution */
for (i = 0; i < solution->nlasers; i++) {
tmpb = range2grid(solution, i, &x, &y, &unused);
assert(tmpb);
GRID(solution, x, y) = 0;
solution->exits[i] = LASER_EMPTY;
}
/* duplicate solution to guess. */
guesses = dup_game(solution);
/* clear out BALL_CORRECT on guess, make BALL_GUESS BALL_CORRECT. */
for (x = 1; x <= state->w; x++) {
for (y = 1; y <= state->h; y++) {
GRID(guesses, x, y) &= ~BALL_CORRECT;
if (GRID(guesses, x, y) & BALL_GUESS)
GRID(guesses, x, y) |= BALL_CORRECT;
}
}
/* for each laser (on both game_states), fire it if it hasn't been fired.
* If one has been fired (or received a hit) and another hasn't, we know
* the ball layouts didn't match and can short-circuit return. */
for (i = 0; i < solution->nlasers; i++) {
if (solution->exits[i] == LASER_EMPTY)
fire_laser(solution, i);
if (guesses->exits[i] == LASER_EMPTY)
fire_laser(guesses, i);
}
/* check each game_state's laser against the other; if any differ, return 0 */
ret = 1;
for (i = 0; i < solution->nlasers; i++) {
tmpb = range2grid(solution, i, &x, &y, &unused);
assert(tmpb);
if (solution->exits[i] != guesses->exits[i]) {
/* If the original state didn't have this shot fired,
* and it would be wrong between the guess and the solution,
* add it. */
if (state->exits[i] == LASER_EMPTY) {
state->exits[i] = solution->exits[i];
if (state->exits[i] == LASER_REFLECT ||
state->exits[i] == LASER_HIT)
GRID(state, x, y) = state->exits[i];
else {
/* add a new shot, incrementing state's laser count. */
int ex, ey, newno = state->laserno++;
tmpb = range2grid(state, state->exits[i], &ex, &ey, &unused);
assert(tmpb);
GRID(state, x, y) = newno;
GRID(state, ex, ey) = newno;
}
state->exits[i] |= LASER_OMITTED;
} else {
state->exits[i] |= LASER_WRONG;
}
ret = 0;
}
}
if (ret == 0 ||
state->nguesses < state->minballs ||
state->nguesses > state->maxballs) goto done;
/* fix up original state so the 'correct' balls end up matching the guesses,
* as we've just proved that they were equivalent. */
for (x = 1; x <= state->w; x++) {
for (y = 1; y <= state->h; y++) {
if (GRID(state, x, y) & BALL_GUESS)
GRID(state, x, y) |= BALL_CORRECT;
else
GRID(state, x, y) &= ~BALL_CORRECT;
}
}
done:
/* fill in nright and nwrong. */
state->nright = state->nwrong = state->nmissed = 0;
for (x = 1; x <= state->w; x++) {
for (y = 1; y <= state->h; y++) {
int bs = GRID(state, x, y) & (BALL_GUESS | BALL_CORRECT);
if (bs == (BALL_GUESS | BALL_CORRECT))
state->nright++;
else if (bs == BALL_GUESS)
state->nwrong++;
else if (bs == BALL_CORRECT)
state->nmissed++;
}
}
free_game(solution);
free_game(guesses);
state->reveal = true;
return ret;
}
#define TILE_SIZE (ds->tilesize)
#define TODRAW(x) ((TILE_SIZE * (x)) + (TILE_SIZE / 2))
#define FROMDRAW(x) (((x) + (TILE_SIZE / 2)) / TILE_SIZE - 1)
#define CAN_REVEAL(state) ((state)->nguesses >= (state)->minballs && \
(state)->nguesses <= (state)->maxballs && \
!(state)->reveal && !(state)->justwrong)
struct game_drawstate {
int tilesize, crad, rrad, w, h; /* w and h to make macros work... */
unsigned int *grid; /* as the game_state grid */
bool started, reveal, isflash;
int flash_laserno;
};
static char *interpret_move(const game_state *state, game_ui *ui,
const game_drawstate *ds,
int x, int y, int button)
{
int gx = -1, gy = -1, rangeno = -1, wouldflash = 0;
enum { NONE, TOGGLE_BALL, TOGGLE_LOCK, FIRE, REVEAL,
TOGGLE_COLUMN_LOCK, TOGGLE_ROW_LOCK} action = NONE;
char buf[80], *nullret = NULL;
if (IS_CURSOR_MOVE(button)) {
int cx = ui->cur_x, cy = ui->cur_y;
move_cursor(button, &cx, &cy, state->w+2, state->h+2, false, NULL);
if ((cx == 0 && cy == 0 && !CAN_REVEAL(state)) ||
(cx == 0 && cy == state->h+1) ||
(cx == state->w+1 && cy == 0) ||
(cx == state->w+1 && cy == state->h+1))
return NULL; /* disallow moving cursor to corners. */
ui->cur_x = cx;
ui->cur_y = cy;
ui->cur_visible = true;
return MOVE_UI_UPDATE;
}
if (button == LEFT_BUTTON || button == RIGHT_BUTTON) {
gx = FROMDRAW(x);
gy = FROMDRAW(y);
ui->cur_visible = false;
wouldflash = 1;
} else if (button == LEFT_RELEASE) {
ui->flash_laser = 0;
return MOVE_UI_UPDATE;
} else if (IS_CURSOR_SELECT(button)) {
if (ui->cur_visible) {
gx = ui->cur_x;
gy = ui->cur_y;
ui->flash_laser = 0;
wouldflash = 2;
} else {
ui->cur_visible = true;
return MOVE_UI_UPDATE;
}
/* Fix up 'button' for the below logic. */
if (button == CURSOR_SELECT2) button = RIGHT_BUTTON;
else button = LEFT_BUTTON;
}
if (gx != -1 && gy != -1) {
if (gx == 0 && gy == 0 && button == LEFT_BUTTON)
action = REVEAL;
if (gx >= 1 && gx <= state->w && gy >= 1 && gy <= state->h) {
if (button == LEFT_BUTTON) {
if (!(GRID(state, gx,gy) & BALL_LOCK))
action = TOGGLE_BALL;
} else
action = TOGGLE_LOCK;
}
if (grid2range(state, gx, gy, &rangeno)) {
if (button == LEFT_BUTTON)
action = FIRE;
else if (gy == 0 || gy > state->h)
action = TOGGLE_COLUMN_LOCK; /* and use gx */
else
action = TOGGLE_ROW_LOCK; /* and use gy */
}
}
switch (action) {
case TOGGLE_BALL:
sprintf(buf, "T%d,%d", gx, gy);
break;
case TOGGLE_LOCK:
sprintf(buf, "LB%d,%d", gx, gy);
break;
case TOGGLE_COLUMN_LOCK:
sprintf(buf, "LC%d", gx);
break;