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fixed one pole filter, wide stereo bit

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This commit is contained in:
Dennis Ranke
2022-04-02 00:06:04 +02:00
parent 82c1ddb867
commit 1917057b81
3 changed files with 31 additions and 12 deletions
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41
platform/src/ges.cwa
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@@ -108,10 +108,10 @@ export fn gesSnd(t: i32) -> f32 {
} else {
loop noiseLoop {
let s = phase >> 12;
let pulse = ((phase >> 8) & 255) >= pulseWidth;
let inline pulse = ((phase >> 8) & 255) >= pulseWidth;
s = s * 0x6746ba73;
s = s ^ (s >> 15) * pulse;
i!(GesBufferOffset + 128*4) = (s * 0x835776c7 + (phase << 16)) >> 16;
i!(GesBufferOffset + 128*4) = (s * 0x835776c7) >> 16;
phase = phase + phaseInc;
branch_if (i := i + 4) < 64*4: noiseLoop;
}
@@ -123,20 +123,37 @@ export fn gesSnd(t: i32) -> f32 {
let channelVol = ((ch >> 1)?0x68 >> ((ch & 1) * 4)) & 15;
envVol = envVol * channelVol / 15;
let leftVol = (0x4c6a >> (ch * 4)) & 15;
let leftVol = (select(ctrl & 16, 0x3d5b, 0x6a79) >> (ch * 4)) & 15;
let rightVol = 16 - leftVol;
let lazy filter = ((ctrl >> 2) & 3) - 1;
let lazy filter = (ctrl >> 2) & 3;
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;
if filter < 2 {
if filter {
let f = (4096 as f32 - min(4096 as f32, 4096 as f32 * exp(freq * (-8.0 * 3.141 / 44100.0)))) as i32;
let low = (ch * 8)!(GesStateOffset + GesState.Filter);
loop filterLoop {
let in = (i!(GesBufferOffset + 128*4) * envVol) >> 18;
low = low + (((in - low) * f) >> 12);
(i * 2)!GesBufferOffset = (i * 2)!GesBufferOffset + ((low * leftVol) >> 4);
(i * 2)!(GesBufferOffset + 4) = (i * 2)!(GesBufferOffset + 4) + ((low * rightVol) >> 4);
branch_if (i := i + 4) < 64*4: filterLoop;
(ch * 8)!(GesStateOffset + GesState.Filter) = low;
(ch * 8)!(GesStateOffset + GesState.Filter + 4) = 0;
}
} else {
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;
(ch * 8)!(GesStateOffset + GesState.Filter) = sample;
(ch * 8)!(GesStateOffset + GesState.Filter + 4) = 0;
}
}
} else {
filter = filter - 2;
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);
@@ -162,9 +179,9 @@ export fn gesSnd(t: i32) -> f32 {
(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;
}
(ch * 8)!(GesStateOffset + GesState.Filter) = low;
(ch * 8)!(GesStateOffset + GesState.Filter + 4) = band;
}
branch_if (ch := ch + 1) < 4: channelLoop;