#include <revolution.h>
#include <revolution/axart.h>typedef struct
{
f32 *lfo; // lfo samples in RAM
u32 length; // lfo samples for 1 period
f32 delta; // lfo delta per 5ms
u32 sampleIndex; // lfo sample index
f32 counter; // lfo counter
f32 sample1; // lfo last sample for interpolation
f32 sample; // lfo sample
f32 output; // lfo output
} AXART_LFO;AXART_LFO is a data structure for an LFO. AXART_LFO is used by articulators that modulate volume or pitch. To apply an articulator containing an LFO to an AXART_SOUND, the AXART_LFO must be initialized by calling AXARTInitLfo() prior to calling AXARTAddArticulator().
| Data Member | Description |
| f32 *lfo | Pointer to the first sample of LFO shape in RAM. This parameter is maintained by AXART. Do not write to this parameter. |
| u32 length | Number of samples for the LFO. This parameter is maintained by AXART. Do not write to this parameter. |
| f32 delta | Sample index delta per audio frame. This sets period frequency for the LFO. delta = Hz * (length / 200). The user may change this at any time. |
| u32 sampleIndex | Current sample index for LFO output. This parameter is maintained by AXART. Do not write to this parameter. |
| f32 counter | Running counter for output sample interpolation. Interpolation is linear. This parameter is maintained by AXART. Do not write to this parameter. |
| f32 sample1 | Last LFO sample for interpolation. This parameter is maintained by AXART. Do not write to this parameter. |
| f32 sample | Current LFO sample for interpolation. This parameter is maintained by AXART. Do not write to this parameter. |
| f32 output | Output for LFO. This parameter is maintained by AXART. Do not write to this parameter. |
AXARTInitLfo
AXARTAddArticulator
AXART_SOUND
03/01/2006 Initial version.