fix for the sigmoid functions

src/net/torvald/tsvm/AppLoader.java

@@ -37,7 +37,7 @@ public class AppLoader {
 
         EmulInstance reference = new EmulInstance(appConfig, vm, "net.torvald.tsvm.peripheral.ReferenceGraphicsAdapter", "assets/disk0");
         EmulInstance reference2 = new EmulInstance(appConfig, vm, "net.torvald.tsvm.peripheral.ReferenceLikeLCD", "assets/disk0");
-        EmulInstance term = new EmulInstance(appConfig, vm, "net.torvald.tsvm.peripheral.TexticsAdapter", "assets/disk0");
+        EmulInstance term = new EmulInstance(appConfig, vm, "net.torvald.tsvm.peripheral.Term", "assets/disk0");
         EmulInstance portable = new EmulInstance(appConfig, vm, "net.torvald.tsvm.peripheral.CharacterLCDdisplay", "assets/disk0");
 
         EmulInstance wp = new EmulInstance(appConfig, vm, "net.torvald.tsvm.peripheral.WpTerm", "assets/wpdisk");

src/net/torvald/tsvm/peripheral/GraphicsAdapter.kt

@@ -916,20 +916,23 @@ int getTileFromColor(vec4 color) {
     return _colToInt(color) & 0xFFFFF;
 }
 
+uniform float sgmp = 4.3;
+float sgmcomp = 2.0 / (1.0 + exp(-sgmp)) - 1.001; // making sure everything sits within [0..1)
+
 float sigmoid(float x) {
-    return 2.0 / (1.0 + exp(-6.333 * x)) - 1.0;
+    return (2.0 / (1.0 + exp(-sgmp * x)) - 1.0) / sgmcomp;
 }
 
 vec4 sigmoid(vec4 x) {
-    return 2.0 / (1.0 + exp(-6.333 * x)) - 1.0;
+    return (2.0 / (1.0 + exp(-sgmp * x)) - 1.0) / sgmcomp;
 }
 
 float invsigmoid(float x) {
-    return (1.0 / 6.333) * log((1.0 + x) / (1.0 - x));
+    return (1.0 / sgmp) * log((1.0 + sgmcomp * x) / (1.0 - sgmcomp * x));
 }
 
 vec4 invsigmoid(vec4 x) {
-    return (1.0 / 6.333) * log((1.0 + x) / (1.0 - x));
+    return (1.0 / sgmp) * log((1.0 + sgmcomp * x) / (1.0 - sgmcomp * x));
 }
 
 vec4 sigmoidmix(vec4 a, vec4 b, float x) {
@@ -1023,20 +1026,23 @@ vec4 grey(vec4 color) {
     return vec4(lum, lum, lum, color.a);
 }
 
+uniform float sgmp = 4.3;
+float sgmcomp = 2.0 / (1.0 + exp(-sgmp)) - 1.001; // making sure everything sits within [0..1)
+
 float sigmoid(float x) {
-    return 2.0 / (1.0 + exp(-6.333 * x)) - 1.0;
+    return (2.0 / (1.0 + exp(-sgmp * x)) - 1.0) / sgmcomp;
 }
 
 vec4 sigmoid(vec4 x) {
-    return 2.0 / (1.0 + exp(-6.333 * x)) - 1.0;
+    return (2.0 / (1.0 + exp(-sgmp * x)) - 1.0) / sgmcomp;
 }
 
 float invsigmoid(float x) {
-    return (1.0 / 6.333) * log((1.0 + x) / (1.0 - x));
+    return (1.0 / sgmp) * log((1.0 + sgmcomp * x) / (1.0 - sgmcomp * x));
 }
 
 vec4 invsigmoid(vec4 x) {
-    return (1.0 / 6.333) * log((1.0 + x) / (1.0 - x));
+    return (1.0 / sgmp) * log((1.0 + sgmcomp * x) / (1.0 - sgmcomp * x));
 }
 
 vec4 sigmoidmix(vec4 a, vec4 b, float x) {

src/net/torvald/tsvm/peripheral/TexticsAdapter.kt

@@ -1,6 +1,5 @@
 package net.torvald.tsvm.peripheral
 
-import com.badlogic.gdx.graphics.Camera
 import com.badlogic.gdx.graphics.Color
 import com.badlogic.gdx.graphics.GL20
 import com.badlogic.gdx.graphics.Texture
@@ -9,19 +8,7 @@ import net.torvald.tsvm.VM
 import net.torvald.tsvm.kB
 import kotlin.math.absoluteValue
 
-open class TexticsAdapter(vm: VM, config: AdapterConfig = AdapterConfig(
+open class TexticsAdapterBase(vm: VM, config: AdapterConfig) : GraphicsAdapter(vm, config) {
-    "crt_white",
-    720,
-    480,
-    80,
-    32,
-    254,
-    0,
-    256.kB(),
-    "./hp2640.png",
-    0.32f,
-    GraphicsAdapter.TEXT_TILING_SHADER_MONOCHROME
-)) : GraphicsAdapter(vm, config) {
 
     private val crtGradTex = Texture("./assets/crt_grad.png")
 
@@ -77,7 +64,21 @@ open class TexticsAdapter(vm: VM, config: AdapterConfig = AdapterConfig(
     }
 }
 
-class WpTerm(vm: VM) : TexticsAdapter(vm = vm, AdapterConfig(
+class Term(vm: VM) : TexticsAdapterBase(vm, AdapterConfig(
+    "crt_white",
+    720,
+    480,
+    80,
+    32,
+    254,
+    0,
+    256.kB(),
+    "./hp2640.png",
+    0.32f,
+    GraphicsAdapter.TEXT_TILING_SHADER_MONOCHROME
+))
+
+class WpTerm(vm: VM) : TexticsAdapterBase(vm, AdapterConfig(
     "crt_amber",
     810,
     300,