/// <summary>
/// Set an array of generators to their initial value
/// </summary>
/// <param name="gens"></param>
/// <param name="channel"></param>
static public void fluid_gen_init(HiGen[] gens, fluid_channel channel)
{
fluid_gen_info.fluid_gen_set_default_values(gens);
//for (int i = 0; i < gens.Length; i++)
//{
// gens[i].nrpn = channel.gens[i];
///* This is an extension to the SoundFont standard. More
// * documentation is available at the fluid_synth_set_gen2()
// * function. */
//if (fluid_channel_get_gen_abs(channel, i))
//{
// gen[i].flags = GEN_ABS_NRPN;
//}
//}
}
public ushort SfTrans; /* transform applied to source */
public float fluid_mod_get_value(fluid_channel chan, int key, int vel)
{
float v1 = 0.0f, v2 = 1.0f;
float range1 = 127.0f, range2 = 127.0f;
if (chan == null)
{
return(0.0f);
}
/* 'special treatment' for default controller
*
* Reference: SF2.01 section 8.4.2
*
* The GM default controller 'vel-to-filter cut off' is not clearly defined: If implemented according to the specs, the filter
* frequency jumps between vel=63 and vel=64. To maintain compatibility with existing sound fonts, the implementation is
* 'hardcoded', it is impossible to implement using only one modulator otherwise.
*
* I assume here, that the 'intention' of the paragraph is one octave (1200 cents) filter frequency shift between vel=127 and
* vel=64. 'amount' is (-2400), at least as long as the controller is set to default.
*
* Further, the 'appearance' of the modulator (source enumerator, destination enumerator, flags etc) is different from that
* described in section 8.4.2, but it matches the definition used in several SF2.1 sound fonts (where it is used only to turn it off).
* */
if ((Dest == (byte)fluid_gen_type.GEN_FILTERFC) &&
(Src2 == (int)fluid_mod_src.FLUID_MOD_VELOCITY) &&
(Src1 == (int)fluid_mod_src.FLUID_MOD_VELOCITY) &&
(Flags1 == ((byte)fluid_mod_flags.FLUID_MOD_GC | (byte)fluid_mod_flags.FLUID_MOD_UNIPOLAR | (byte)fluid_mod_flags.FLUID_MOD_NEGATIVE | (byte)fluid_mod_flags.FLUID_MOD_LINEAR)) &&
(Flags2 == ((byte)fluid_mod_flags.FLUID_MOD_GC | (byte)fluid_mod_flags.FLUID_MOD_UNIPOLAR | (byte)fluid_mod_flags.FLUID_MOD_POSITIVE | (byte)fluid_mod_flags.FLUID_MOD_SWITCH)))
{
if (vel < 64)
{
return(Amount / 2.0f);
}
else
{
return(Amount * (127f - vel) / 127f);
}
}
/* get the initial value of the first source */
if (Src1 > 0)
{
if ((Flags1 & (byte)fluid_mod_flags.FLUID_MOD_CC) > 0)
{
v1 = ((Src1 >= 0) && (Src1 < 128)) ? chan.cc[Src1] : 0;
//if (src1 == 10) Debug.Log("retreive pan " + v1);
}
else
{
/* source 1 is one of the direct controllers */
switch (Src1)
{
case (int)fluid_mod_src.FLUID_MOD_NONE: /* SF 2.01 8.2.1 item 0: src enum=0 => value is 1 */
v1 = range1;
break;
case (int)fluid_mod_src.FLUID_MOD_VELOCITY:
v1 = vel;
break;
case (int)fluid_mod_src.FLUID_MOD_KEY:
v1 = key;
break;
case (int)fluid_mod_src.FLUID_MOD_KEYPRESSURE:
v1 = chan.key_pressure;
break;
case (int)fluid_mod_src.FLUID_MOD_CHANNELPRESSURE:
v1 = chan.channel_pressure;
break;
case (int)fluid_mod_src.FLUID_MOD_PITCHWHEEL:
v1 = chan.pitch_bend;
range1 = 0x4000;
break;
case (int)fluid_mod_src.FLUID_MOD_PITCHWHEELSENS:
v1 = chan.pitch_wheel_sensitivity;
break;
default:
v1 = 0.0f;
break;
}
}
/* transform the input value */
switch (Flags1 & 0x0f)
{
case 0: /* linear, unipolar, positive */
v1 /= range1;
break;
case 1: /* linear, unipolar, negative */
v1 = 1.0f - v1 / range1;
break;
case 2: /* linear, bipolar, positive */
v1 = -1.0f + 2.0f * v1 / range1;
break;
case 3: /* linear, bipolar, negative */
v1 = -1.0f + 2.0f * v1 / range1;
break;
case 4: /* concave, unipolar, positive */
v1 = fluid_conv.fluid_concave(v1);
break;
case 5: /* concave, unipolar, negative */
v1 = fluid_conv.fluid_concave(127 - v1);
break;
case 6: /* concave, bipolar, positive */
v1 = (v1 > 64) ? fluid_conv.fluid_concave(2 * (v1 - 64)) : -fluid_conv.fluid_concave(2 * (64 - v1));
break;
case 7: /* concave, bipolar, negative */
v1 = (v1 > 64) ? -fluid_conv.fluid_concave(2 * (v1 - 64)) : fluid_conv.fluid_concave(2 * (64 - v1));
break;
case 8: /* convex, unipolar, positive */
v1 = fluid_conv.fluid_convex(v1);
break;
case 9: /* convex, unipolar, negative */
v1 = fluid_conv.fluid_convex(127 - v1);
break;
case 10: /* convex, bipolar, positive */
v1 = (v1 > 64) ? -fluid_conv.fluid_convex(2 * (v1 - 64)) : fluid_conv.fluid_convex(2 * (64 - v1));
break;
case 11: /* convex, bipolar, negative */
v1 = (v1 > 64) ? -fluid_conv.fluid_convex(2 * (v1 - 64)) : fluid_conv.fluid_convex(2 * (64 - v1));
break;
case 12: /* switch, unipolar, positive */
v1 = (v1 >= 64) ? 1.0f : 0.0f;
break;
case 13: /* switch, unipolar, negative */
v1 = (v1 >= 64) ? 0.0f : 1.0f;
break;
case 14: /* switch, bipolar, positive */
v1 = (v1 >= 64) ? 1.0f : -1.0f;
break;
case 15: /* switch, bipolar, negative */
v1 = (v1 >= 64) ? -1.0f : 1.0f;
break;
}
}
else
{
return(0.0f);
}
/* no need to go further */
if (v1 == 0.0f)
{
return(0.0f);
}
/* get the second input source */
if (Src2 > 0)
{
if ((Flags2 & (byte)fluid_mod_flags.FLUID_MOD_CC) > 0)
{
v2 = ((Src2 >= 0) && (Src2 < 128)) ? chan.cc[Src2] : 0;
}
else
{
switch (Src2)
{
case (int)fluid_mod_src.FLUID_MOD_NONE: /* SF 2.01 8.2.1 item 0: src enum=0 => value is 1 */
v2 = range2;
break;
case (int)fluid_mod_src.FLUID_MOD_VELOCITY:
v2 = vel;
break;
case (int)fluid_mod_src.FLUID_MOD_KEY:
v2 = key;
break;
case (int)fluid_mod_src.FLUID_MOD_KEYPRESSURE:
v2 = chan.key_pressure;
break;
case (int)fluid_mod_src.FLUID_MOD_CHANNELPRESSURE:
v2 = chan.channel_pressure;
break;
case (int)fluid_mod_src.FLUID_MOD_PITCHWHEEL:
v2 = chan.pitch_bend;
break;
case (int)fluid_mod_src.FLUID_MOD_PITCHWHEELSENS:
v2 = chan.pitch_wheel_sensitivity;
break;
default:
v1 = 0.0f;
break;
}
}
/* transform the second input value */
switch (Flags2 & 0x0f)
{
case 0: /* linear, unipolar, positive */
v2 /= range2;
break;
case 1: /* linear, unipolar, negative */
v2 = 1.0f - v2 / range2;
break;
case 2: /* linear, bipolar, positive */
v2 = -1.0f + 2.0f * v2 / range2;
break;
case 3: /* linear, bipolar, negative */
v2 = -1.0f + 2.0f * v2 / range2;
break;
case 4: /* concave, unipolar, positive */
v2 = fluid_conv.fluid_concave(v2);
break;
case 5: /* concave, unipolar, negative */
v2 = fluid_conv.fluid_concave(127 - v2);
break;
case 6: /* concave, bipolar, positive */
v2 = (v2 > 64) ? fluid_conv.fluid_concave(2 * (v2 - 64)) : -fluid_conv.fluid_concave(2 * (64 - v2));
break;
case 7: /* concave, bipolar, negative */
v2 = (v2 > 64) ? -fluid_conv.fluid_concave(2 * (v2 - 64)) : fluid_conv.fluid_concave(2 * (64 - v2));
break;
case 8: /* convex, unipolar, positive */
v2 = fluid_conv.fluid_convex(v2);
break;
case 9: /* convex, unipolar, negative */
v2 = 1.0f - fluid_conv.fluid_convex(v2);
break;
case 10: /* convex, bipolar, positive */
v2 = (v2 > 64) ? -fluid_conv.fluid_convex(2 * (v2 - 64)) : fluid_conv.fluid_convex(2 * (64 - v2));
break;
case 11: /* convex, bipolar, negative */
v2 = (v2 > 64) ? -fluid_conv.fluid_convex(2 * (v2 - 64)) : fluid_conv.fluid_convex(2 * (64 - v2));
break;
case 12: /* switch, unipolar, positive */
v2 = (v2 >= 64) ? 1.0f : 0.0f;
break;
case 13: /* switch, unipolar, negative */
v2 = (v2 >= 64) ? 0.0f : 1.0f;
break;
case 14: /* switch, bipolar, positive */
v2 = (v2 >= 64) ? 1.0f : -1.0f;
break;
case 15: /* switch, bipolar, negative */
v2 = (v2 >= 64) ? -1.0f : 1.0f;
break;
}
}
else
{
v2 = 1.0f;
}
/* it's as simple as that: */
return(Amount * v1 * v2);
}