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Scramble now is a lot closer to reports and recordings (background sound, sound of bullets).

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This commit is contained in:
Couriersud 2009-02-26 21:15:56 +00:00
parent 857a7ee91f
commit 906a76dd8a
1 changed files with 36 additions and 12 deletions
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48
src/emu/sound/disc_flt.c
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@ -102,6 +102,9 @@ struct dst_rcfilter_sw_context
{ {
double vCap[4]; double vCap[4];
double exp[4]; double exp[4];
double exp0; /* fast case bit 0 */
double exp1; /* fast case bit 1 */
double factor; /* fast case */
}; };
struct dst_rcintegrate_context struct dst_rcintegrate_context
@ -1012,6 +1015,7 @@ static DISCRETE_RESET(dst_rcfilter)
#define DST_RCFILTER_SW__C(x) (*(node->input[4+x])) #define DST_RCFILTER_SW__C(x) (*(node->input[4+x]))
#define CD4066_ON_RES 270 #define CD4066_ON_RES 270
#define DST_RCFILTER_SW_ITERATIONS (10)
// FIXME: This needs optimization ! // FIXME: This needs optimization !
static DISCRETE_STEP(dst_rcfilter_sw) static DISCRETE_STEP(dst_rcfilter_sw)
@ -1024,21 +1028,37 @@ static DISCRETE_STEP(dst_rcfilter_sw)
if (DST_RCFILTER_SW__ENABLE) if (DST_RCFILTER_SW__ENABLE)
{ {
for (j=0;j<10;j++) { switch (bits)
for (i = 0; i < 4; i++) {
case 0:
node->output[0] = DST_RCFILTER_SW__VIN;
break;
case 1:
context->vCap[0] += (DST_RCFILTER_SW__VIN - context->vCap[0]) * context->exp0;
node->output[0] = context->vCap[0] + (DST_RCFILTER_SW__VIN - context->vCap[0]) * context->factor;
break;
case 2:
context->vCap[1] += (DST_RCFILTER_SW__VIN - context->vCap[1]) * context->exp1;
node->output[0] = context->vCap[1] + (DST_RCFILTER_SW__VIN - context->vCap[1]) * context->factor;
break;
default:
for (j = 0; j < DST_RCFILTER_SW_ITERATIONS; j++)
{ {
if (( bits & (1 << i)) != 0) for (i = 0; i < 4; i++)
{ {
us += context->vCap[i]; if (( bits & (1 << i)) != 0)
rs += DST_RCFILTER_SW__R; {
us += context->vCap[i];
rs += DST_RCFILTER_SW__R;
}
} }
} node->output[0] = RES_VOLTAGE_DIVIDER(rs, CD4066_ON_RES) * DST_RCFILTER_SW__VIN + DST_RCFILTER_SW__R / (CD4066_ON_RES + rs) * us;
node->output[0] = RES_VOLTAGE_DIVIDER(rs, CD4066_ON_RES) * DST_RCFILTER_SW__VIN + DST_RCFILTER_SW__R / (CD4066_ON_RES + rs) * us; for (i = 0; i < 4; i++)
for (i = 0; i < 4; i++)
{
if (( bits & (1 << i)) != 0)
{ {
context->vCap[i] += (node->output[0] - context->vCap[i]) * context->exp[i]; if (( bits & (1 << i)) != 0)
{
context->vCap[i] += (node->output[0] - context->vCap[i]) * context->exp[i];
}
} }
} }
} }
@ -1058,8 +1078,12 @@ static DISCRETE_RESET(dst_rcfilter_sw)
for (i = 0; i < 4; i++) for (i = 0; i < 4; i++)
{ {
context->vCap[i] = 0; context->vCap[i] = 0;
context->exp[i] = RC_CHARGE_EXP(10.0f * CD4066_ON_RES * DST_RCFILTER_SW__C(i)); context->exp[i] = RC_CHARGE_EXP(((double) DST_RCFILTER_SW_ITERATIONS) * CD4066_ON_RES * DST_RCFILTER_SW__C(i));
} }
/* fast cases */
context->exp0 = RC_CHARGE_EXP((CD4066_ON_RES + DST_RCFILTER_SW__R) * DST_RCFILTER_SW__C(0));
context->exp1 = RC_CHARGE_EXP((CD4066_ON_RES + DST_RCFILTER_SW__R) * DST_RCFILTER_SW__C(1));
context->factor = RES_VOLTAGE_DIVIDER(DST_RCFILTER_SW__R, CD4066_ON_RES);
node->output[0] = 0; node->output[0] = 0;
} }