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first full version of time for ges

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This commit is contained in:
Dennis Ranke
2022-03-08 22:20:54 +01:00
parent f178076b86
commit a15e796489
6 changed files with 225 additions and 187 deletions
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154
platform/src/ges.cwa Normal file
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const GesChannelState.Trigger = 0;
const GesChannelState.EnvState = 1;
const GesChannelState.EnvVol = 2;
const GesChannelState.Phase = 4;
const GesChannelState.Size = 6;
const GesState.Filter = GesChannelState.Size * 4;
const GesState.Size = GesState.Filter + 8*4;
const GesStateOffset = 112;
const GesBufferOffset = 112 + GesState.Size;
export fn gesSnd(t: i32) -> f32 {
if !(t & 127) {
let i: i32;
loop clearLoop {
i!GesBufferOffset = 0;
branch_if (i := i + 4) < 128*8: clearLoop;
}
let ch: i32;
loop channelLoop {
let lazy channelState = GesStateOffset + ch * GesChannelState.Size;
let lazy channelReg = 80 + ch * 6;
let envState = channelState?GesChannelState.EnvState;
let envVol = i32.load16_u(channelState, GesChannelState.EnvVol);
let lazy oldTrigger = channelState?GesChannelState.Trigger;
let lazy ctrl = channelReg?0;
if (oldTrigger ^ ctrl) & (ctrl | 2) & 3 {
envState = 1;
envVol = 0;
}
channelState?GesChannelState.Trigger = ctrl;
if envState {
envVol = envVol + (16384 / ((channelReg?4 >> 4) + 1));
if envVol >= 65535 {
envVol = 65535;
envState = 0;
}
} else {
if !envState & ctrl {
envVol = envVol - (16 - (channelReg?4 & 15)) * 48;
let sustain = (channelReg?5 >> 4) * 4096;
if envVol < sustain {
envVol = sustain;
}
} else {
envVol = envVol - (16 - (channelReg?5 & 15)) * 48;
if envVol < 0 {
envVol = 0;
}
}
}
channelState?GesChannelState.EnvState = envState;
i32.store16(envVol, channelState, GesChannelState.EnvVol);
let inline note = i32.load16_u(channelReg, 2);
let inline freq = 440 as f32 * pow(2.0, (note - 69*256) as f32 / (12*256) as f32);
let phaseInc = (freq * (65536.0 / 44100.0)) as i32;
let phase = i32.load16_u(channelState, GesChannelState.Phase) << 8;
i = 0;
let wave = ctrl >> 6;
if wave < 2 {
if wave {
loop sawLoop {
i!(GesBufferOffset + 128*4) = (phase & 65535) - 32768;
phase = phase + phaseInc;
branch_if (i := i + 4) < 64*4: sawLoop;
}
}
else
{
loop rectLoop {
i!(GesBufferOffset + 128*4) = select(phase & 32768, -32768, 32767);
phase = phase + phaseInc;
branch_if (i := i + 4) < 64*4: rectLoop;
}
}
} else {
if wave == 2 {
loop triLoop {
let s = phase << 16;
s = s ^ (s >> 31);
i!(GesBufferOffset + 128*4) = (s >> 15) - 32768;
phase = phase + phaseInc;
branch_if (i := i + 4) < 64*4: triLoop;
}
} else {
loop noiseLoop {
let s = (phase >> 12) & 4095;
s = s * 0x6746ba73;
s = s ^ (s >> 15);
i!(GesBufferOffset + 128*4) = (s * 0x83567a92) >> 16;
phase = phase + phaseInc;
branch_if (i := i + 4) < 64*4: noiseLoop;
}
}
}
i32.store16(phase >> 8, channelState, GesChannelState.Phase);
let channelVol = ((ch >> 1)?0x68 >> ((ch & 1) * 4)) & 15;
envVol = envVol * channelVol / 15;
let leftVol = (0x4c6a >> (ch * 4)) & 15;
let rightVol = 16 - leftVol;
let lazy filter = ((ctrl >> 2) & 3) - 1;
i = 0;
if filter #> 1 {
loop mixLoop {
let sample = (i!(GesBufferOffset + 128*4) * envVol) >> 18;
(i * 2)!GesBufferOffset = (i * 2)!GesBufferOffset + ((sample * leftVol) >> 4);
(i * 2)!(GesBufferOffset + 4) = (i * 2)!(GesBufferOffset + 4) + ((sample * rightVol) >> 4);
branch_if (i := i + 4) < 64*4: mixLoop;
}
} else {
let ctrl = filter?0x6a;
let note = i32.load16_u(filter * 2, 0x6c);
let inline freq = 440 as f32 * pow(2.0, (note - 69*256) as f32 / (12*256) as f32);
let F = min(4096 as f32, 8192 as f32 * sin(freq * (3.1415 / 44100.0))) as i32;
let Q = 7000 - ctrl * (6000/255);
let low_out = ctrl & 1;
let high_out = (ctrl >> 1) & 1;
let band_out = (ctrl >> 2) & 1;
let low = (ch * 8)!(GesStateOffset + GesState.Filter);
let band = (ch * 8)!(GesStateOffset + GesState.Filter + 4);
loop filterLoop {
let in = (i!(GesBufferOffset + 128*4) * envVol) >> 18;
let high = in - low - ((band * Q) >> 12);
band = band + ((F * high) >> 12);
low = low + ((F * band) >> 12);
let sample = low * low_out + high * high_out + band * band_out;
(i * 2)!GesBufferOffset = (i * 2)!GesBufferOffset + ((sample * leftVol) >> 4);
(i * 2)!(GesBufferOffset + 4) = (i * 2)!(GesBufferOffset + 4) + ((sample * rightVol) >> 4);
branch_if (i := i + 4) < 64*4: filterLoop;
}
(ch * 8)!(GesStateOffset + GesState.Filter) = low;
(ch * 8)!(GesStateOffset + GesState.Filter + 4) = band;
}
branch_if (ch := ch + 1) < 4: channelLoop;
}
}
(((t & 127) * 4)!GesBufferOffset) as f32 / 32768 as f32
}