ECM2

Assets/VolumetricLightBeam/Scripts/Noise3D.cs

@@ -0,0 +1,77 @@
+using UnityEngine;
+
+#pragma warning disable 0429, 0162 // Unreachable expression code detected (because of Noise3D.isSupported on mobile)
+
+namespace VLB
+{
+    public static class Noise3D
+    {
+        /// <summary>
+        /// Returns if the 3D Noise feature is supported on the current platform or not.
+        /// 3D Noise feature requires a graphicsShaderLevel 35 or higher (which is basically Shader Model 3.5 / OpenGL ES 3.0 or above)
+        /// If not supported, the beams will look like the 3D Noise has been disabled.
+        /// </summary>
+        public static bool isSupported {
+            get {
+                if (!ms_IsSupportedChecked)
+                {
+                    ms_IsSupported = SystemInfo.graphicsShaderLevel >= kMinShaderLevel;
+                    if (!ms_IsSupported)
+                        Debug.LogWarning(isNotSupportedString);
+                    ms_IsSupportedChecked = true;
+                }
+                return ms_IsSupported;
+            }
+        }
+
+        /// <summary>
+        /// Returns if the 3D Noise Texture has been successfully loaded or not.
+        /// If the feature is not supported (isSupported == false), isProperlyLoaded is also false.
+        /// </summary>
+        public static bool isProperlyLoaded { get { return ms_NoiseTexture != null; } }
+
+        public static string isNotSupportedString { get {
+                var str = string.Format("3D Noise requires higher shader capabilities (Shader Model 3.5 / OpenGL ES 3.0), which are not available on the current platform: graphicsShaderLevel (current/required) = {0} / {1}",
+                    SystemInfo.graphicsShaderLevel,
+                    kMinShaderLevel);
+#if UNITY_EDITOR
+                str += "\nPlease change the editor's graphics emulation for a more capable one via \"Edit/Graphics Emulation\" and press Play to force the light beams to be recomputed.";
+#endif
+                return str;
+            }
+        }
+
+        static bool ms_IsSupportedChecked = false;
+        static bool ms_IsSupported = false;
+        static Texture3D ms_NoiseTexture = null;
+
+        const int kMinShaderLevel = 35; // Shader Model 3.5 / OpenGL ES 3.0 to handle sampler3D -> https://docs.unity3d.com/ScriptReference/SystemInfo-graphicsShaderLevel.html
+
+        [RuntimeInitializeOnLoadMethod]
+        static void OnStartUp()
+        {
+            LoadIfNeeded();
+        }
+
+#if UNITY_EDITOR
+        public static void _EditorForceReloadData()
+        {
+            ms_NoiseTexture = null;
+            LoadIfNeeded();
+        }
+#endif
+
+        public static void LoadIfNeeded()
+        {
+            if (!isSupported) return;
+
+            if (ms_NoiseTexture == null)
+            {
+                ms_NoiseTexture = Config.Instance.noiseTexture3D;
+
+                Shader.SetGlobalTexture(ShaderProperties.GlobalNoiseTex3D, ms_NoiseTexture);
+                Shader.SetGlobalFloat(ShaderProperties.GlobalNoiseCustomTime, -1.0f);
+            }
+        }
+    }
+}