diff options
Diffstat (limited to 'grfspecial.c')
| -rw-r--r-- | grfspecial.c | 57 |
1 files changed, 46 insertions, 11 deletions
diff --git a/grfspecial.c b/grfspecial.c index c569aebb3..15b60113a 100644 --- a/grfspecial.c +++ b/grfspecial.c @@ -723,7 +723,6 @@ static void SpriteNewSuperset(byte *buf, int len) /* Action 0x03 */ static void VehicleMapSpriteSuperset(byte *buf, int len) { - byte *bufend = buf + len; /* <03> <feature> <n-id> <ids>... <num-cid> [<cargo-type> <cid>]... <def-cid> * id-list := [<id>] [id-list] * cargo-list := <cargo-type> <cid> [cargo-list] @@ -927,33 +926,69 @@ static void SkipIf(byte *buf, int len) uint8 paramsize; uint8 condtype; uint8 numsprites; - int val, result; + int param_val = 0, cond_val = 0, result; check_length(len, 6, "SkipIf"); param = buf[1]; paramsize = buf[2]; condtype = buf[3]; - numsprites = buf[4 + paramsize]; - if (param == 0x83) { - val = _opt.landscape; - } else { - grfmsg(GMS_WARN, "Unsupported param %x. Ignoring test.", param); - return; + if (condtype < 2) { + /* Always 1 for bit tests, the given value should + * be ignored. */ + paramsize = 1; + } + + buf += 4; + if (paramsize == 4) + cond_val = grf_load_dword(&buf); + else if (paramsize == 2) + cond_val = grf_load_word(&buf); + else if (paramsize == 1) + cond_val = grf_load_byte(&buf); + + switch (param) { + case 0x83: + param_val = _opt.landscape; + break; + case 0x84: + /* XXX: This should be always true (at least until we get multiple loading stages?). */ + param_val = 1; + break; + case 0x86: + param_val = _opt.road_side << 4; + break; + default: + grfmsg(GMS_WARN, "Unsupported param %x. Ignoring test.", param); + return; } switch (condtype) { - case 2: result = (buf[4] == val); + case 0: result = (param_val & (1 << cond_val)); + break; + case 1: result = !(param_val & (1 << cond_val)); + break; + /* TODO: For the following, make it to work with paramsize>1. */ + case 2: result = (param_val == cond_val); break; - case 3: result = (buf[4] != val); + case 3: result = (param_val != cond_val); + break; + case 4: result = (param_val < cond_val); + break; + case 5: result = (param_val > cond_val); break; default: grfmsg(GMS_WARN, "Unsupported test %d. Ignoring.", condtype); return; } - if (!result) + if (result == 0) { + grfmsg(GMS_NOTICE, "Not skipping sprites, test was false."); return; + } + + numsprites = grf_load_byte(&buf); + grfmsg(GMS_NOTICE, "Skipping %d sprites, test was true.", numsprites); _skip_sprites = numsprites; if (_skip_sprites == 0) { |