Library/PackageCache/com.unity.postprocessing@2.1.6/PostProcessing/Runtime/Utils/TextureFormatUtilities.cs

   1 using System;
   2 using System.Collections.Generic;
   3 using UnityEngine.Assertions;
   4
   5 namespace UnityEngine.Rendering.PostProcessing
   6 {
   7     // Temporary code dump until the texture format refactor goes into trunk...
   8
   9     /// <summary>
  10     /// A set of utilities to deal with texture formats.
  11     /// </summary>
  12     public static class TextureFormatUtilities
  13     {
  14         static Dictionary<int, RenderTextureFormat> s_FormatAliasMap;
  15         static Dictionary<int, bool> s_SupportedRenderTextureFormats;
  16         static Dictionary<int, bool> s_SupportedTextureFormats;
  17
  18         static TextureFormatUtilities()
  19         {
  20             s_FormatAliasMap = new Dictionary<int, RenderTextureFormat>
  21             {
  22                 { (int)TextureFormat.Alpha8, RenderTextureFormat.ARGB32 },
  23                 { (int)TextureFormat.ARGB4444, RenderTextureFormat.ARGB4444 },
  24                 { (int)TextureFormat.RGB24, RenderTextureFormat.ARGB32 },
  25                 { (int)TextureFormat.RGBA32, RenderTextureFormat.ARGB32 },
  26                 { (int)TextureFormat.ARGB32, RenderTextureFormat.ARGB32 },
  27                 { (int)TextureFormat.RGB565, RenderTextureFormat.RGB565 },
  28                 { (int)TextureFormat.R16, RenderTextureFormat.RHalf },
  29                 { (int)TextureFormat.DXT1, RenderTextureFormat.ARGB32 },
  30                 { (int)TextureFormat.DXT5, RenderTextureFormat.ARGB32 },
  31                 { (int)TextureFormat.RGBA4444, RenderTextureFormat.ARGB4444 },
  32                 { (int)TextureFormat.BGRA32, RenderTextureFormat.ARGB32 },
  33                 { (int)TextureFormat.RHalf, RenderTextureFormat.RHalf },
  34                 { (int)TextureFormat.RGHalf, RenderTextureFormat.RGHalf },
  35                 { (int)TextureFormat.RGBAHalf, RenderTextureFormat.ARGBHalf },
  36                 { (int)TextureFormat.RFloat, RenderTextureFormat.RFloat },
  37                 { (int)TextureFormat.RGFloat, RenderTextureFormat.RGFloat },
  38                 { (int)TextureFormat.RGBAFloat, RenderTextureFormat.ARGBFloat },
  39                 { (int)TextureFormat.RGB9e5Float, RenderTextureFormat.ARGBHalf },
  40                 { (int)TextureFormat.BC4, RenderTextureFormat.R8 },
  41                 { (int)TextureFormat.BC5, RenderTextureFormat.RGHalf },
  42                 { (int)TextureFormat.BC6H, RenderTextureFormat.ARGBHalf },
  43                 { (int)TextureFormat.BC7, RenderTextureFormat.ARGB32 },
  44             #if !UNITY_IOS && !UNITY_TVOS
  45                 { (int)TextureFormat.DXT1Crunched, RenderTextureFormat.ARGB32 },
  46                 { (int)TextureFormat.DXT5Crunched, RenderTextureFormat.ARGB32 },
  47             #endif
  48                 { (int)TextureFormat.PVRTC_RGB2, RenderTextureFormat.ARGB32 },
  49                 { (int)TextureFormat.PVRTC_RGBA2, RenderTextureFormat.ARGB32 },
  50                 { (int)TextureFormat.PVRTC_RGB4, RenderTextureFormat.ARGB32 },
  51                 { (int)TextureFormat.PVRTC_RGBA4, RenderTextureFormat.ARGB32 },
  52             #if !UNITY_2018_1_OR_NEWER
  53                 { (int)TextureFormat.ATC_RGB4, RenderTextureFormat.ARGB32 },
  54                 { (int)TextureFormat.ATC_RGBA8, RenderTextureFormat.ARGB32 },
  55             #endif
  56                 { (int)TextureFormat.ETC_RGB4, RenderTextureFormat.ARGB32 },
  57                 { (int)TextureFormat.ETC2_RGB, RenderTextureFormat.ARGB32 },
  58                 { (int)TextureFormat.ETC2_RGBA1, RenderTextureFormat.ARGB32 },
  59                 { (int)TextureFormat.ETC2_RGBA8, RenderTextureFormat.ARGB32 },
  60             #if UNITY_2019_1_OR_NEWER
  61                 { (int)TextureFormat.ASTC_4x4, RenderTextureFormat.ARGB32 },
  62                 { (int)TextureFormat.ASTC_5x5, RenderTextureFormat.ARGB32 },
  63                 { (int)TextureFormat.ASTC_6x6, RenderTextureFormat.ARGB32 },
  64                 { (int)TextureFormat.ASTC_8x8, RenderTextureFormat.ARGB32 },
  65                 { (int)TextureFormat.ASTC_10x10, RenderTextureFormat.ARGB32 },
  66                 { (int)TextureFormat.ASTC_12x12, RenderTextureFormat.ARGB32 },
  67             #else
  68                 { (int)TextureFormat.ASTC_RGB_4x4, RenderTextureFormat.ARGB32 },
  69                 { (int)TextureFormat.ASTC_RGB_5x5, RenderTextureFormat.ARGB32 },
  70                 { (int)TextureFormat.ASTC_RGB_6x6, RenderTextureFormat.ARGB32 },
  71                 { (int)TextureFormat.ASTC_RGB_8x8, RenderTextureFormat.ARGB32 },
  72                 { (int)TextureFormat.ASTC_RGB_10x10, RenderTextureFormat.ARGB32 },
  73                 { (int)TextureFormat.ASTC_RGB_12x12, RenderTextureFormat.ARGB32 },
  74                 { (int)TextureFormat.ASTC_RGBA_4x4, RenderTextureFormat.ARGB32 },
  75                 { (int)TextureFormat.ASTC_RGBA_5x5, RenderTextureFormat.ARGB32 },
  76                 { (int)TextureFormat.ASTC_RGBA_6x6, RenderTextureFormat.ARGB32 },
  77                 { (int)TextureFormat.ASTC_RGBA_8x8, RenderTextureFormat.ARGB32 },
  78                 { (int)TextureFormat.ASTC_RGBA_10x10, RenderTextureFormat.ARGB32 },
  79                 { (int)TextureFormat.ASTC_RGBA_12x12, RenderTextureFormat.ARGB32 },
  80             #endif
  81             #if !UNITY_2018_3_OR_NEWER
  82                 { (int)TextureFormat.ETC_RGB4_3DS, RenderTextureFormat.ARGB32 },
  83                 { (int)TextureFormat.ETC_RGBA8_3DS, RenderTextureFormat.ARGB32 }
  84             #endif
  85             };
  86
  87             // TODO: refactor the next two scopes in a generic function once we have support for enum constraints on generics
  88             // In 2018.1 SystemInfo.SupportsRenderTextureFormat() generates garbage so we need to
  89             // cache its calls to avoid that...
  90             {
  91                 s_SupportedRenderTextureFormats = new Dictionary<int, bool>();
  92                 var values = Enum.GetValues(typeof(RenderTextureFormat));
  93
  94                 foreach (var format in values)
  95                 {
  96                     if ((int)format < 0) // Safe guard, negative values are deprecated stuff
  97                         continue;
  98
  99                     if (IsObsolete(format))
 100                         continue;
 101
 102                     bool supported = SystemInfo.SupportsRenderTextureFormat((RenderTextureFormat)format);
 103                     s_SupportedRenderTextureFormats[(int)format] = supported;
 104                 }
 105             }
 106
 107             // Same for TextureFormat
 108             {
 109                 s_SupportedTextureFormats = new Dictionary<int, bool>();
 110                 var values = Enum.GetValues(typeof(TextureFormat));
 111
 112                 foreach (var format in values)
 113                 {
 114                     if ((int)format < 0) // Crashes the runtime otherwise (!)
 115                         continue;
 116
 117                     if (IsObsolete(format))
 118                         continue;
 119
 120                     bool supported = SystemInfo.SupportsTextureFormat((TextureFormat)format);
 121                     s_SupportedTextureFormats[(int)format] = supported;
 122                 }
 123             }
 124         }
 125
 126         static bool IsObsolete(object value)
 127         {
 128             var fieldInfo = value.GetType().GetField(value.ToString());
 129             var attributes = (ObsoleteAttribute[])fieldInfo.GetCustomAttributes(typeof(ObsoleteAttribute), false);
 130             return attributes != null && attributes.Length > 0;
 131         }
 132
 133         /// <summary>
 134         /// Returns a <see cref="RenderTextureFormat"/> compatible with the given texture's format.
 135         /// </summary>
 136         /// <param name="texture">A texture to get a compatible format from</param>
 137         /// <returns>A compatible render texture format</returns>
 138         public static RenderTextureFormat GetUncompressedRenderTextureFormat(Texture texture)
 139         {
 140             Assert.IsNotNull(texture);
 141
 142             if (texture is RenderTexture)
 143                 return (texture as RenderTexture).format;
 144
 145             if (texture is Texture2D)
 146             {
 147                 var inFormat = ((Texture2D)texture).format;
 148                 RenderTextureFormat outFormat;
 149
 150                 if (!s_FormatAliasMap.TryGetValue((int)inFormat, out outFormat))
 151                     throw new NotSupportedException("Texture format not supported");
 152
 153                 return outFormat;
 154             }
 155
 156             return RenderTextureFormat.Default;
 157         }
 158
 159         internal static bool IsSupported(this RenderTextureFormat format)
 160         {
 161             bool supported;
 162             s_SupportedRenderTextureFormats.TryGetValue((int)format, out supported);
 163             return supported;
 164         }
 165
 166         internal static bool IsSupported(this TextureFormat format)
 167         {
 168             bool supported;
 169             s_SupportedTextureFormats.TryGetValue((int)format, out supported);
 170             return supported;
 171         }
 172     }
 173 }