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Small optimization, no credit

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Couriersud 2010-01-27 23:57:17 +00:00
parent 77cc6538e1
commit 9dae23fc0e
1 changed files with 8 additions and 7 deletions
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15
src/emu/sound/disc_flt.c
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@ -1180,21 +1180,22 @@ static DISCRETE_STEP(dst_rcfilter_sw)
int i; int i;
int bits = (int)DST_RCFILTER_SW__SWITCH; int bits = (int)DST_RCFILTER_SW__SWITCH;
double us = 0; double us = 0;
double vIn = DST_RCFILTER_SW__VIN;
if (DST_RCFILTER_SW__ENABLE) if (EXPECTED(DST_RCFILTER_SW__ENABLE))
{ {
switch (bits) switch (bits)
{ {
case 0: case 0:
node->output[0] = DST_RCFILTER_SW__VIN; node->output[0] = vIn;
break; break;
case 1: case 1:
context->vCap[0] += (DST_RCFILTER_SW__VIN - context->vCap[0]) * context->exp0; context->vCap[0] += (vIn - context->vCap[0]) * context->exp0;
node->output[0] = context->vCap[0] + (DST_RCFILTER_SW__VIN - context->vCap[0]) * context->factor; node->output[0] = context->vCap[0] + (vIn - context->vCap[0]) * context->factor;
break; break;
case 2: case 2:
context->vCap[1] += (DST_RCFILTER_SW__VIN - context->vCap[1]) * context->exp1; context->vCap[1] += (vIn - context->vCap[1]) * context->exp1;
node->output[0] = context->vCap[1] + (DST_RCFILTER_SW__VIN - context->vCap[1]) * context->factor; node->output[0] = context->vCap[1] + (vIn - context->vCap[1]) * context->factor;
break; break;
default: default:
for (i = 0; i < 4; i++) for (i = 0; i < 4; i++)
@ -1202,7 +1203,7 @@ static DISCRETE_STEP(dst_rcfilter_sw)
if (( bits & (1 << i)) != 0) if (( bits & (1 << i)) != 0)
us += context->vCap[i]; us += context->vCap[i];
} }
node->output[0] = context->f1[bits] * DST_RCFILTER_SW__VIN + context->f2[bits] * us; node->output[0] = context->f1[bits] * vIn + context->f2[bits] * us;
for (i = 0; i < 4; i++) for (i = 0; i < 4; i++)
{ {
if (( bits & (1 << i)) != 0) if (( bits & (1 << i)) != 0)