From b626d2609aa15fe8cfbe2725eb85c9b1552d4bee Mon Sep 17 00:00:00 2001
From: Dennis Ranke <dennis.ranke@gmail.com>
Date: Wed, 9 Mar 2022 23:03:15 +0100
Subject: [PATCH] implement proper exponential envelope timings

---
 examples/curlywas/tim_ges.cwa |  12 +++++-------
 platform/bin/platform.uw8     | Bin 3338 -> 3341 bytes
 platform/src/ges.cwa          |  22 +++++++++-------------
 src/run-web.html              |   2 +-
 4 files changed, 15 insertions(+), 21 deletions(-)

diff --git a/examples/curlywas/tim_ges.cwa b/examples/curlywas/tim_ges.cwa
index 4d74c2e..db2d325 100644
--- a/examples/curlywas/tim_ges.cwa
+++ b/examples/curlywas/tim_ges.cwa
@@ -36,17 +36,16 @@ export fn upd() {
 
 data 80 {
     i8(
-        0, 64, 0, 128, 0, 0xe,
-        0, 128, 0, 128, 0, 0xc8,
-        5, 128, 0, 128, 0, 0xc8,
-        5, 128, 0, 128, 0, 0xc8,
+        0, 64, 0, 128, 0, 0x90,
+        0, 128, 0, 128, 0, 0x4c,
+        5, 128, 0, 128, 0, 0x4c,
+        5, 128, 0, 128, 0, 0x4c,
         0xf8, 0x85,
-        0xc1, 0xf1, 0, 110, 0, 80
+        0x81, 0x81, 0, 105, 0, 80
     )
 }
 
 /*
-
 include "../../platform/src/ges.cwa"
 
 import "env.pow" fn pow(f32, f32) -> f32;
@@ -55,5 +54,4 @@ import "env.sin" fn sin(f32) -> f32;
 export fn snd(t: i32) -> f32 {
     gesSnd(t)
 }
-
 */
\ No newline at end of file
diff --git a/platform/bin/platform.uw8 b/platform/bin/platform.uw8
index 9276f19f1bd76f3eae4e0f07571de1db7f2f1714..92c9afd48bc1949346520cdd577850d0bbabb714 100644
GIT binary patch
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diff --git a/platform/src/ges.cwa b/platform/src/ges.cwa
index 99ade94..a99d1ce 100644
--- a/platform/src/ges.cwa
+++ b/platform/src/ges.cwa
@@ -34,23 +34,19 @@ export fn gesSnd(t: i32) -> f32 {
             channelState?GesChannelState.Trigger = ctrl;
 
             if envState {
-                envVol = envVol + (16384 / ((channelReg?4 >> 4) + 1));
+                envVol = envVol + 8 * pow(1.5625, (15 - channelReg?4 & 15) as f32) as i32;
                 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;
-                    }
+                let inline decay = (channelReg - (ctrl & 1))?5 >> 4;
+                let inline dec = 8 * pow(1.5625, (15 - decay) as f32) as i32;
+                envVol = envVol - ((dec * (envVol + 8192)) >> 16);
+                let inline sustain = (channelReg?5 & 15) << 12;
+                let lazy targetVol = (ctrl & 1) * sustain;
+                if envVol < targetVol {
+                    envVol = targetVol;
                 }
             }
             channelState?GesChannelState.EnvState = envState;
@@ -129,7 +125,7 @@ export fn gesSnd(t: i32) -> f32 {
                 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 Q = 7350 - ctrl * (6530/255);
                 let low_out = ctrl & 1;
                 let high_out = (ctrl >> 1) & 1;
                 let band_out = (ctrl >> 2) & 1;
diff --git a/src/run-web.html b/src/run-web.html
index 7631b88..9f127c7 100644
--- a/src/run-web.html
+++ b/src/run-web.html
@@ -1 +1 @@
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