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/************************************************************************
*
* MAME - Discrete sound system emulation library
*
* Written by Keith Wilkins (mame@esplexo.co.uk)
*
* (c) K.Wilkins 2000
*
***********************************************************************
*
* DSS_ADJUSTMENT - UI Mapped adjustable input
* DSS_CONSTANT - Node based constant - Do we need this ???
* DSS_INPUT_x - Input devices
* DSS_INPUT_STREAM - Connects external streams to the discrete system
*
************************************************************************/
#define DSS_INPUT__GAIN (*(node->input[0]))
#define DSS_INPUT__OFFSET (*(node->input[1]))
#define DSS_INPUT__INIT (*(node->input[2]))
struct dss_adjustment_context
{
INT32 port;
INT32 lastpval;
INT32 pmin;
double pscale;
double min;
double scale;
};
READ8_HANDLER(discrete_sound_r)
{
discrete_info *info = sndti_token(SOUND_DISCRETE, 0);
node_description *node = discrete_find_node(info, offset);
UINT8 data = 0;
/* Read the node input value if allowed */
if (node)
{
UINT8 *node_data = node->context;
if ((node->module.type >= DSS_INPUT_DATA) && (node->module.type <= DSS_INPUT_PULSE))
{
data = *node_data;
}
}
else
discrete_log("discrete_sound_r read from non-existent NODE_%02d\n", offset-NODE_00);
return data;
}
WRITE8_HANDLER(discrete_sound_w)
{
discrete_info *info = sndti_token(SOUND_DISCRETE, 0);
node_description *node = discrete_find_node(info, offset);
/* Update the node input value if it's a proper input node */
if (node)
{
UINT8 *node_data = node->context;
UINT8 last_data = *node_data;
switch (node->module.type)
{
case DSS_INPUT_DATA:
*node_data = data;
break;
case DSS_INPUT_LOGIC:
case DSS_INPUT_PULSE:
*node_data = data ? 1 : 0;
break;
case DSS_INPUT_NOT:
*node_data = data ? 0 : 1;
break;
}
/* Bring the system up to now */
if (last_data != *node_data)
stream_update(info->discrete_stream);
}
else
{
discrete_log("discrete_sound_w write to non-existent NODE_%02d\n", offset-NODE_00);
}
}
/************************************************************************
*
* DSS_ADJUSTMENT - UI Adjustable constant node to emulate trimmers
*
* input[0] - Enable
* input[1] - Minimum value
* input[2] - Maximum value
* input[3] - Log/Linear 0=Linear !0=Log
* input[4] - Input Port number
* input[5] -
* input[6] -
*
************************************************************************/
#define DSS_ADJUSTMENT__ENABLE (*(node->input[0]))
#define DSS_ADJUSTMENT__MIN (*(node->input[1]))
#define DSS_ADJUSTMENT__MAX (*(node->input[2]))
#define DSS_ADJUSTMENT__LOG (*(node->input[3]))
#define DSS_ADJUSTMENT__PORT (*(node->input[4]))
#define DSS_ADJUSTMENT__PMIN (*(node->input[5]))
#define DSS_ADJUSTMENT__PMAX (*(node->input[6]))
void dss_adjustment_step(node_description *node)
{
if (DSS_ADJUSTMENT__ENABLE)
{
struct dss_adjustment_context *context = node->context;
INT32 rawportval = readinputport(context->port);
/* only recompute if the value changed from last time */
if (rawportval != context->lastpval)
{
double portval = (double)(rawportval - context->pmin) * context->pscale;
double scaledval = portval * context->scale + context->min;
context->lastpval = rawportval;
if (DSS_ADJUSTMENT__LOG == 0)
node->output = scaledval;
else
node->output = pow(10, scaledval);
}
}
else
{
node->output = 0;
}
}
void dss_adjustment_reset(node_description *node)
{
struct dss_adjustment_context *context = node->context;
double min, max;
if (node->custom)
{
context->port = port_tag_to_index(node->custom);
if (context->port == -1)
fatalerror("DISCRETE_ADJUSTMENT_TAG - NODE_%d has invalid tag", node->node-NODE_00);
}
else
context->port = DSS_ADJUSTMENT__PORT;
context->lastpval = 0x7fffffff;
context->pmin = DSS_ADJUSTMENT__PMIN;
context->pscale = 1.0 / (double)(DSS_ADJUSTMENT__PMAX - DSS_ADJUSTMENT__PMIN);
/* linear scale */
if (DSS_ADJUSTMENT__LOG == 0)
{
context->min = DSS_ADJUSTMENT__MIN;
context->scale = DSS_ADJUSTMENT__MAX - DSS_ADJUSTMENT__MIN;
}
/* logarithmic scale */
else
{
/* force minimum and maximum to be > 0 */
min = (DSS_ADJUSTMENT__MIN > 0) ? DSS_ADJUSTMENT__MIN : 1;
max = (DSS_ADJUSTMENT__MAX > 0) ? DSS_ADJUSTMENT__MAX : 1;
context->min = log10(min);
context->scale = log10(max) - log10(min);
}
dss_adjustment_step(node);
}
/************************************************************************
*
* DSS_CONSTANT - This is a constant.
*
* input[0] - Constant value
*
************************************************************************/
#define DSS_CONSTANT__INIT (*(node->input[0]))
void dss_constant_step(node_description *node)
{
node->output= DSS_CONSTANT__INIT;
}
/************************************************************************
*
* DSS_INPUT_x - Receives input from discrete_sound_w
*
* input[0] - Gain value
* input[1] - Offset value
* input[2] - Starting Position
* input[3] - Current data value
*
************************************************************************/
void dss_input_step(node_description *node)
{
UINT8 *node_data = node->context;
node->output = *node_data * DSS_INPUT__GAIN + DSS_INPUT__OFFSET;
}
void dss_input_reset(node_description *node)
{
UINT8 *node_data = node->context;
switch (node->module.type)
{
case DSS_INPUT_DATA:
*node_data = DSS_INPUT__INIT;
break;
case DSS_INPUT_LOGIC:
case DSS_INPUT_PULSE:
*node_data = (DSS_INPUT__INIT == 0) ? 0 : 1;
break;
case DSS_INPUT_NOT:
*node_data = (DSS_INPUT__INIT == 0) ? 1 : 0;
break;
}
dss_input_step(node);
}
void dss_input_pulse_step(node_description *node)
{
UINT8 *node_data = node->context;
/* Set a valid output */
node->output = *node_data;
/* Reset the input to default for the next cycle */
/* node order is now important */
*node_data = DSS_INPUT__INIT;
}
/************************************************************************
*
* DSS_INPUT_STREAM - Receives input from a routed stream
*
* input[0] - Input stream number
* input[1] - Gain value
* input[2] - Offset value
*
************************************************************************/
#define DSS_INPUT_STREAM__STREAM (*(node->input[0]))
#define DSS_INPUT_STREAM__GAIN (*(node->input[1]))
#define DSS_INPUT_STREAM__OFFSET (*(node->input[2]))
void dss_input_stream_step(node_description *node)
{
// the context pointer is set to point to the current input stream data in discrete_stream_update
stream_sample_t **ptr = node->context;
stream_sample_t *data = *ptr;
node->output = data ? (*data) * DSS_INPUT_STREAM__GAIN + DSS_INPUT_STREAM__OFFSET : 0;
}
void dss_input_stream_reset(node_description *node)
{
int istream = DSS_INPUT_STREAM__STREAM;
/* we will use the node's context pointer to point to the input stream data */
assert(istream < discrete_current_context->discrete_input_streams);
node->context = &discrete_current_context->input_stream_data[istream];
}
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