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-rw-r--r--src/newgrf.cpp79
1 files changed, 39 insertions, 40 deletions
diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index 21dc9ffb4..aa4802226 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -6553,19 +6553,45 @@ static void SkipIf(ByteReader *buf)
return;
}
- uint32 param_val = GetParamVal(param, &cond_val);
+ grfmsg(7, "SkipIf: Test condtype %d, param 0x%02X, condval 0x%08X", condtype, param, cond_val);
- grfmsg(7, "SkipIf: Test condtype %d, param 0x%08X, condval 0x%08X", condtype, param_val, cond_val);
-
- /*
- * Parameter (variable in specs) 0x88 can only have GRF ID checking
- * conditions, except conditions 0x0B, 0x0C (cargo availability) and
- * 0x0D, 0x0E (Rail type availability) as those ignore the parameter.
- * So, when the condition type is one of those, the specific variable
- * 0x88 code is skipped, so the "general" code for the cargo
- * availability conditions kicks in.
+ /* condtypes that do not use 'param' are always valid.
+ * condtypes that use 'param' are either not valid for param 0x88, or they are only valid for param 0x88.
*/
- if (param == 0x88 && (condtype < 0x0B || condtype > 0x0E)) {
+ if (condtype >= 0x0B) {
+ /* Tests that ignore 'param' */
+ switch (condtype) {
+ case 0x0B: result = GetCargoIDByLabel(BSWAP32(cond_val)) == CT_INVALID;
+ break;
+ case 0x0C: result = GetCargoIDByLabel(BSWAP32(cond_val)) != CT_INVALID;
+ break;
+ case 0x0D: result = GetRailTypeByLabel(BSWAP32(cond_val)) == INVALID_RAILTYPE;
+ break;
+ case 0x0E: result = GetRailTypeByLabel(BSWAP32(cond_val)) != INVALID_RAILTYPE;
+ break;
+ case 0x0F: {
+ RoadType rt = GetRoadTypeByLabel(BSWAP32(cond_val));
+ result = rt == INVALID_ROADTYPE || !RoadTypeIsRoad(rt);
+ break;
+ }
+ case 0x10: {
+ RoadType rt = GetRoadTypeByLabel(BSWAP32(cond_val));
+ result = rt != INVALID_ROADTYPE && RoadTypeIsRoad(rt);
+ break;
+ }
+ case 0x11: {
+ RoadType rt = GetRoadTypeByLabel(BSWAP32(cond_val));
+ result = rt == INVALID_ROADTYPE || !RoadTypeIsTram(rt);
+ break;
+ }
+ case 0x12: {
+ RoadType rt = GetRoadTypeByLabel(BSWAP32(cond_val));
+ result = rt != INVALID_ROADTYPE && RoadTypeIsTram(rt);
+ break;
+ }
+ default: grfmsg(1, "SkipIf: Unsupported condition type %02X. Ignoring", condtype); return;
+ }
+ } else if (param == 0x88) {
/* GRF ID checks */
GRFConfig *c = GetGRFConfig(cond_val, mask);
@@ -6606,7 +6632,8 @@ static void SkipIf(ByteReader *buf)
default: grfmsg(1, "SkipIf: Unsupported GRF condition type %02X. Ignoring", condtype); return;
}
} else {
- /* Parameter or variable tests */
+ /* Tests that use 'param' and are not GRF ID checks. */
+ uint32 param_val = GetParamVal(param, &cond_val); // cond_val is modified for param == 0x85
switch (condtype) {
case 0x00: result = !!(param_val & (1 << cond_val));
break;
@@ -6620,34 +6647,6 @@ static void SkipIf(ByteReader *buf)
break;
case 0x05: result = (param_val & mask) > cond_val;
break;
- case 0x0B: result = GetCargoIDByLabel(BSWAP32(cond_val)) == CT_INVALID;
- break;
- case 0x0C: result = GetCargoIDByLabel(BSWAP32(cond_val)) != CT_INVALID;
- break;
- case 0x0D: result = GetRailTypeByLabel(BSWAP32(cond_val)) == INVALID_RAILTYPE;
- break;
- case 0x0E: result = GetRailTypeByLabel(BSWAP32(cond_val)) != INVALID_RAILTYPE;
- break;
- case 0x0F: {
- RoadType rt = GetRoadTypeByLabel(BSWAP32(cond_val));
- result = rt == INVALID_ROADTYPE || !RoadTypeIsRoad(rt);
- break;
- }
- case 0x10: {
- RoadType rt = GetRoadTypeByLabel(BSWAP32(cond_val));
- result = rt != INVALID_ROADTYPE && RoadTypeIsRoad(rt);
- break;
- }
- case 0x11: {
- RoadType rt = GetRoadTypeByLabel(BSWAP32(cond_val));
- result = rt == INVALID_ROADTYPE || !RoadTypeIsTram(rt);
- break;
- }
- case 0x12: {
- RoadType rt = GetRoadTypeByLabel(BSWAP32(cond_val));
- result = rt != INVALID_ROADTYPE && RoadTypeIsTram(rt);
- break;
- }
default: grfmsg(1, "SkipIf: Unsupported condition type %02X. Ignoring", condtype); return;
}
}