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(svn r11141) -Codechange: add support for NewGRF's varaction2 operators 11, 12 and 13.

This commit is contained in:
rubidium 2007-09-22 20:29:17 +00:00
parent 726ea01d6c
commit ed2b6f4f72
2 changed files with 21 additions and 0 deletions
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18
src/newgrf_spritegroup.cpp
View File

@ -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;
}
}

3
src/newgrf_spritegroup.h
View File

@ -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)
};