Add new PreIntegratedGF with 80% smaller but more accurate data

Update old generation code, use R16G16_UNorm format instead of R11G11B10, skip mips and reduce Y axis to 32 pixels.

#1492

Source/Engine/Tools/TextureTool/TextureTool.DirectXTex.cpp

@@ -707,6 +707,8 @@ bool TextureTool::ImportTextureDirectXTex(ImageType type, const StringView& path
     PixelFormat targetFormat = TextureTool::ToPixelFormat(options.Type, width, height, options.Compress);
     if (options.sRGB)
         targetFormat = PixelFormatExtensions::TosRGB(targetFormat);
+    if (options.InternalFormat != PixelFormat::Unknown)
+        targetFormat = options.InternalFormat;
     DXGI_FORMAT targetDxgiFormat = ToDxgiFormat(targetFormat);
 
     // Check mip levels

Source/Engine/Tools/TextureTool/TextureTool.h

@@ -121,6 +121,10 @@ API_CLASS(Namespace="FlaxEngine.Tools", Static) class FLAXENGINE_API TextureTool
         API_FIELD(Attributes="HideInEditor")
         Array<Sprite> Sprites;
 
+        // The custom format to use. Can be used to override default format from texture Type.
+        API_FIELD(Attributes="HideInEditor")
+        PixelFormat InternalFormat = PixelFormat::Unknown;
+
         // Function used for fast importing textures used by internal parts of the engine
         Function<bool(TextureData&)> InternalLoad;
 

Source/Engine/Tools/TextureTool/TextureTool.stb.cpp

@@ -527,6 +527,8 @@ bool TextureTool::ImportTextureStb(ImageType type, const StringView& path, Textu
     PixelFormat targetFormat = ToPixelFormat(options.Type, width, height, options.Compress);
     if (options.sRGB)
         targetFormat = PixelFormatExtensions::TosRGB(targetFormat);
+    if (options.InternalFormat != PixelFormat::Unknown)
+        targetFormat = options.InternalFormat;
 
     // Check mip levels
     int32 sourceMipLevels = textureDataSrc->GetMipLevels();