diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/newgrf_spritegroup.cpp | 18 | ||||
| -rw-r--r-- | src/newgrf_spritegroup.h | 3 |
2 files changed, 21 insertions, 0 deletions
diff --git a/src/newgrf_spritegroup.cpp b/src/newgrf_spritegroup.cpp index 37f5e65f1..557c5dcfc 100644 --- a/src/newgrf_spritegroup.cpp +++ b/src/newgrf_spritegroup.cpp @@ -106,6 +106,21 @@ static inline uint32 GetVariable(const ResolverObject *object, byte variable, by } +/** + * Rotate val rot times to the right + * @param val the value to rotate + * @param rot the amount of times to rotate + * @return the rotated value + */ +static uint32 RotateRight(uint32 val, uint32 rot) +{ + /* Do not rotate more than necessary */ + rot %= 32; + + return (val >> rot) | (val << (32 - rot)); +} + + /* Evaluate an adjustment for a variable of the given size. * U is the unsigned type and S is the signed type to use. */ template <typename U, typename S> @@ -140,6 +155,9 @@ static U EvalAdjustT(const DeterministicSpriteGroupAdjust *adjust, ResolverObjec case DSGA_OP_STO: _temp_store.Store(value, last_value); return last_value; case DSGA_OP_RST: return value; case DSGA_OP_STOP: if (object->psa != NULL) object->psa->Store(value, last_value); return last_value; + case DSGA_OP_ROR: return RotateRight(last_value, value); + case DSGA_OP_SCMP: return ((S)last_value == (S)value) ? 1 : ((S)last_value < (S)value ? 0 : 2); + case DSGA_OP_UCMP: return ((U)last_value == (U)value) ? 1 : ((U)last_value < (U)value ? 0 : 2); default: return value; } } diff --git a/src/newgrf_spritegroup.h b/src/newgrf_spritegroup.h index ebe07cd63..3f84b9af9 100644 --- a/src/newgrf_spritegroup.h +++ b/src/newgrf_spritegroup.h @@ -77,6 +77,9 @@ enum DeterministicSpriteGroupAdjustOperation { DSGA_OP_STO, ///< store a into temporary storage, indexed by b. return a DSGA_OP_RST, ///< return b DSGA_OP_STOP, ///< store a into persistent storage, indexed by b, return a + DSGA_OP_ROR, ///< rotate a b positions to the right + DSGA_OP_SCMP, ///< (signed) comparision (a < b -> 0, a == b = 1, a > b = 2) + DSGA_OP_UCMP, ///< (unsigned) comparision (a < b -> 0, a == b = 1, a > b = 2) }; |