AudioSelector

Assets/Util/ThemeShaderBinder.cs

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+using UnityEngine;
+using System.Collections.Generic;
+using Assets.WasapiAudio.Scripts.Unity;
+
+[RequireComponent(typeof(Material))]
+public class ThemeShaderBinder : MonoBehaviour
+{
+    public Material material;
+    public Preferences preferences;
+
+    private Texture2D _texture;
+    private Color[] _colorCache;
+    private int textureSize = 128;
+    private Gradient _theme;
+
+    private void Start() {
+        if (preferences == null) {
+            Debug.Log("Theme Shader Binder needs Preferences.");
+            gameObject.SetActive(false);
+        }
+    }
+
+    private void Update() {
+        UpdateTexture();
+        UpdateBinding();
+    }
+
+    public Color DecomposeHdrColor(Color linearColorHdr) {
+        var maxColorComponent = linearColorHdr.maxColorComponent;
+        float scaleFactor = 191f / maxColorComponent;
+        float exposure = Mathf.Log(255f / scaleFactor) / Mathf.Log(2f);
+        float factor = 1f / exposure;
+
+        if (exposure <= 1f) {
+            return linearColorHdr;
+        }
+
+        float r = linearColorHdr.r * factor;
+        float g = linearColorHdr.g * factor;
+        float b = linearColorHdr.b * factor;
+
+        return new Color(r, g, b, linearColorHdr.a);
+    }
+
+    private void UpdateTexture() {
+        if (_theme == preferences.Theme()) return;
+
+        Debug.Log("Reinitialising Theme texture...");
+        _texture = new Texture2D(textureSize, 1);
+        _theme = preferences.Theme();
+        _colorCache = new Color[textureSize];
+        _texture.name = $"ThemeTexture{textureSize}";
+        _texture.wrapMode = TextureWrapMode.Clamp;
+
+        for (int i = 0; i < textureSize; i++) {
+            if (_theme == null) return;
+            Color color = DecomposeHdrColor(_theme.Evaluate((float)i / (float)textureSize));
+            // Color color = _theme.Evaluate((float)i / (float)textureSize);
+            _colorCache[i] = color;
+        }
+
+        _texture.SetPixels(_colorCache);
+        _texture.Apply();
+    }
+
+    public void UpdateBinding() {
+        UpdateTexture();
+        material.SetFloat("_ThemeSize", textureSize);
+        material.SetTexture("_ThemeTexture", _texture);
+    }
+}