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(svn r550) -newgrf: Support for action 0xd (change a parameter (sorta variable for the GRF scripts)). Based on patch by octo, heavy changes by pasky.

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darkvater 2004-11-12 18:57:46 +00:00
parent 16f8a7b2d2
commit c53cf38ffd
1 changed files with 101 additions and 2 deletions
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103
grfspecial.c
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@ -23,6 +23,9 @@ extern int _replace_sprites_offset[16];
static const char *_cur_grffile;
static int _cur_spriteid;
static int32 _paramlist[0x7f];
static int _param_max;
typedef void (*SpecialSpriteHandler)(byte *buf, int len);
static const int _vehshifts[4] = {
@ -899,7 +902,13 @@ static void SkipIf(byte *buf, int len)
param_val = _opt.road_side << 4;
break;
default:
grfmsg(GMS_WARN, "Unsupported param %x. Ignoring test.", param);
if (param >= 0x80) {
/* In-game variable. */
grfmsg(GMS_WARN, "Unsupported in-game variable %x. Ignoring test.", param);
} else {
/* Parameter. */
param_val = _paramlist[param];
}
return;
}
@ -1065,7 +1074,97 @@ static void ParamSet(byte *buf, int len)
* 06 Signed bit shift, source1 by source2
* (source2 like in 05, and source1 as well)
*/
/* TODO */
byte target;
byte oper;
uint16 src1;
uint16 src2;
uint16 data = 0;
check_length(len, 5, "ParamSet");
target = grf_load_byte(&buf);
oper = grf_load_byte(&buf);
src1 = grf_load_byte(&buf);
src2 = grf_load_byte(&buf);
if (len >= 8)
data = grf_load_dword(&buf);
/* You can add 80 to the operation to make it apply only if the target
* is not defined yet. In this respect, a parameter is taken to be
* defined if any of the following applies:
* - it has been set to any value in the newgrf(w).cfg parameter list
* - it OR A PARAMETER WITH HIGHER NUMBER has been set to any value by
* an earlier action D */
if (oper & 0x80) {
if (_param_max < target)
oper &= 0x7F;
else
return;
}
/* The source1 and source2 operands refer to the grf parameter number
* like in action 6 and 7. In addition, they can refer to the special
* variables available in action 7, or they can be FF to use the value
* of <data>. If referring to parameters that are undefined, a value
* of 0 is used instead. */
if (src1 == 0xFF) {
src1 = data;
} else {
src1 = _param_max >= src1 ? _paramlist[src1] : 0;
}
if (src2 == 0xFF) {
src2 = data;
} else {
src2 = _param_max >= src2 ? _paramlist[src2] : 0;
}
/* TODO: You can access the parameters of another GRF file by using
* source2=FE, source1=the other GRF's parameter number and data=GRF
* ID. This is only valid with operation 00 (set). If the GRF ID
* cannot be found, a value of 0 is used for the parameter value
* instead. */
/* TODO: The target operand can also refer to the special variables
* from action 7, but at the moment the only variable that is valid to
* write is 8E. */
if (_param_max < target)
_param_max = target;
/* FIXME: No checking for overflows. */
switch (oper) {
case 0x00:
_paramlist[target] = src1;
break;
case 0x01:
_paramlist[target] = src1 + src2;
break;
case 0x02:
_paramlist[target] = src1 - src2;
break;
case 0x03:
_paramlist[target] = ((uint32) src1) * ((uint32) src2);
break;
case 0x04:
_paramlist[target] = ((int32) src1) * ((int32) src2);
break;
case 0x05:
if (src2 & 0x8000) /* src2 is "negative" */
_paramlist[target] = src1 >> -((int16) src2);
else
_paramlist[target] = src1 << src2;
break;
case 0x06:
if (src2 & 0x8000) /* src2 is "negative" */
_paramlist[target] = ((int16) src1) >> -((int16) src2);
else
_paramlist[target] = ((int16) src1) << src2;
break;
default:
grfmsg(GMS_ERROR, "ParamSet: Unknown operation %d, skipping.", oper);
}
}
static void GRFInhibit(byte *buf, int len)