public override IEnumerable<AssetItem> Import(UFile rawAssetPath, AssetImporterParameters importParameters)
{
var asset = new TextureAsset { Source = rawAssetPath };
// Creates the url to the texture
var textureUrl = new UFile(rawAssetPath.GetFileName(), null);
yield return new AssetItem(textureUrl, asset);
}
public override IEnumerable <AssetItem> Import(UFile rawAssetPath, AssetImporterParameters importParameters)
{
var asset = new TextureAsset {
Source = rawAssetPath
};
// Creates the url to the texture
var textureUrl = new UFile(rawAssetPath.GetFileName(), null);
yield return(new AssetItem(textureUrl, asset));
}
public TextureConvertParameters(
UFile sourcePathFromDisk,
TextureAsset texture,
PlatformType platform,
GraphicsPlatform graphicsPlatform,
GraphicsProfile graphicsProfile,
TextureQuality textureQuality)
{
SourcePathFromDisk = sourcePathFromDisk;
Texture = texture;
Platform = platform;
GraphicsPlatform = graphicsPlatform;
GraphicsProfile = graphicsProfile;
TextureQuality = textureQuality;
}
public static ResultStatus ImportAndSaveTextureImage(UFile sourcePath, string outputUrl, TextureAsset textureAsset, TextureConvertParameters parameters, CancellationToken cancellationToken, Logger logger)
{
var assetManager = new AssetManager();
using (var texTool = new TextureTool())
using (var texImage = texTool.Load(sourcePath, textureAsset.SRgb))
{
// Apply transformations
texTool.Decompress(texImage, textureAsset.SRgb);
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
return ResultStatus.Cancelled;
var fromSize = new Size2(texImage.Width, texImage.Height);
var targetSize = new Size2((int)textureAsset.Width, (int)textureAsset.Height);
// Resize the image
if (textureAsset.IsSizeInPercentage)
{
targetSize = new Size2((int)(fromSize.Width * (float)textureAsset.Width / 100.0f), (int)(fromSize.Height * (float) textureAsset.Height / 100.0f));
}
// Find the target size
targetSize = FindBestTextureSize(textureAsset.Format, parameters.GraphicsPlatform, parameters.GraphicsProfile, fromSize, targetSize, textureAsset.GenerateMipmaps, logger);
// Resize the image only if needed
if (targetSize != fromSize)
{
texTool.Resize(texImage, targetSize.Width, targetSize.Height, Filter.Rescaling.Lanczos3);
}
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
return ResultStatus.Cancelled;
// texture size is now determined, we can cache it
var textureSize = new Int2(texImage.Width, texImage.Height);
// Apply the color key
if (textureAsset.ColorKeyEnabled)
texTool.ColorKey(texImage, textureAsset.ColorKeyColor);
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
return ResultStatus.Cancelled;
// Pre-multiply alpha
if (textureAsset.PremultiplyAlpha)
texTool.PreMultiplyAlpha(texImage);
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
return ResultStatus.Cancelled;
// Generate mipmaps
if (textureAsset.GenerateMipmaps)
{
var boxFilteringIsSupported = texImage.Format != PixelFormat.B8G8R8A8_UNorm_SRgb || (IsPowerOfTwo(textureSize.X) && IsPowerOfTwo(textureSize.Y));
texTool.GenerateMipMaps(texImage, boxFilteringIsSupported? Filter.MipMapGeneration.Box: Filter.MipMapGeneration.Linear);
}
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
return ResultStatus.Cancelled;
// Convert/Compress to output format
// TODO: Change alphaFormat depending on actual image content (auto-detection)?
var outputFormat = DetermineOutputFormat(textureAsset, parameters, textureSize, texImage.Format, parameters.Platform, parameters.GraphicsPlatform, parameters.GraphicsProfile);
texTool.Compress(texImage, outputFormat, (TextureConverter.Requests.TextureQuality)parameters.TextureQuality);
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
return ResultStatus.Cancelled;
// Save the texture
using (var outputImage = texTool.ConvertToParadoxImage(texImage))
{
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
return ResultStatus.Cancelled;
assetManager.Save(outputUrl, outputImage.ToSerializableVersion());
logger.Info("Compression successful [{3}] to ({0}x{1},{2})", outputImage.Description.Width, outputImage.Description.Height, outputImage.Description.Format, outputUrl);
}
}
return ResultStatus.Successful;
}
/// <summary>
/// Determine the output format of the texture depending on the platform and asset properties.
/// </summary>
/// <param name="parameters">The conversion request parameters</param>
/// <param name="graphicsPlatform">The graphics platform</param>
/// <param name="graphicsProfile">The graphics profile</param>
/// <param name="imageSize">The texture output size</param>
/// <param name="inputImageFormat">The pixel format of the input image</param>
/// <param name="textureAsset">The texture asset</param>
/// <returns>The pixel format to use as output</returns>
public static PixelFormat DetermineOutputFormat(TextureAsset textureAsset, TextureConvertParameters parameters, Int2 imageSize, PixelFormat inputImageFormat, PlatformType platform, GraphicsPlatform graphicsPlatform,
GraphicsProfile graphicsProfile)
{
if (textureAsset.SRgb && ((int)parameters.GraphicsProfile < (int)GraphicsProfile.Level_9_2 && parameters.GraphicsPlatform != GraphicsPlatform.Direct3D11))
throw new NotSupportedException("sRGB is not supported on OpenGl profile level {0}".ToFormat(parameters.GraphicsProfile));
var hint = textureAsset.Hint;
// Default output format
var outputFormat = PixelFormat.R8G8B8A8_UNorm;
switch (textureAsset.Format)
{
case TextureFormat.Compressed:
switch (parameters.Platform)
{
case PlatformType.Android:
if (inputImageFormat.IsHDR())
{
outputFormat = inputImageFormat;
}
else if (textureAsset.SRgb)
{
outputFormat = PixelFormat.R8G8B8A8_UNorm_SRgb;
}
else
{
switch (graphicsProfile)
{
case GraphicsProfile.Level_9_1:
case GraphicsProfile.Level_9_2:
case GraphicsProfile.Level_9_3:
outputFormat = textureAsset.Alpha == AlphaFormat.None ? PixelFormat.ETC1 : PixelFormat.R8G8B8A8_UNorm;
break;
case GraphicsProfile.Level_10_0:
case GraphicsProfile.Level_10_1:
case GraphicsProfile.Level_11_0:
case GraphicsProfile.Level_11_1:
case GraphicsProfile.Level_11_2:
// GLES3.0 starting from Level_10_0, this profile enables ETC2 compression on Android
outputFormat = textureAsset.Alpha == AlphaFormat.None ? PixelFormat.ETC1 : PixelFormat.ETC2_RGBA;
break;
default:
throw new ArgumentOutOfRangeException("graphicsProfile");
}
}
break;
case PlatformType.iOS:
// PVRTC works only for square POT textures
if (inputImageFormat.IsHDR())
{
outputFormat = inputImageFormat;
}
else if (textureAsset.SRgb)
{
outputFormat = PixelFormat.R8G8B8A8_UNorm_SRgb;
}
else if (SupportPVRTC(imageSize))
{
switch (textureAsset.Alpha)
{
case AlphaFormat.None:
// DXT1 handles 1-bit alpha channel
outputFormat = PixelFormat.PVRTC_4bpp_RGB;
break;
case AlphaFormat.Mask:
// DXT1 handles 1-bit alpha channel
// TODO: Not sure about the equivalent here?
outputFormat = PixelFormat.PVRTC_4bpp_RGBA;
break;
case AlphaFormat.Explicit:
case AlphaFormat.Interpolated:
// DXT3 is good at sharp alpha transitions
// TODO: Not sure about the equivalent here?
outputFormat = PixelFormat.PVRTC_4bpp_RGBA;
break;
default:
throw new ArgumentOutOfRangeException();
}
}
else
{
outputFormat = PixelFormat.R8G8B8A8_UNorm;
}
break;
case PlatformType.Windows:
case PlatformType.WindowsPhone:
case PlatformType.WindowsStore:
switch (parameters.GraphicsPlatform)
{
case GraphicsPlatform.Direct3D11:
// https://msdn.microsoft.com/en-us/library/windows/desktop/hh308955%28v=vs.85%29.aspx
// http://www.reedbeta.com/blog/2012/02/12/understanding-bcn-texture-compression-formats/
// ---------------------------------------------- ---------------------------------------------------- --- ---------------------------------
// Source data Minimum required data compression resolution Recommended format Minimum supported feature level
// ---------------------------------------------- ---------------------------------------------------- --- ---------------------------------
// Three-channel color with alpha channel Three color channels (5 bits:6 bits:5 bits), with 0 or 1 bit(s) of alpha BC1 Direct3D 9.1 (color maps, cutout color maps - 1 bit alpha, normal maps if memory is tight)
// Three-channel color with alpha channel Three color channels (5 bits:6 bits:5 bits), with 4 bits of alpha BC2 Direct3D 9.1 (idem)
// Three-channel color with alpha channel Three color channels (5 bits:6 bits:5 bits) with 8 bits of alpha BC3 Direct3D 9.1 (color maps with alpha, packing color and mono maps together)
// One-channel color One color channel (8 bits) BC4 Direct3D 10 (Height maps, gloss maps, font atlases, any gray scales image)
// Two-channel color Two color channels (8 bits:8 bits) BC5 Direct3D 10 (Tangent space normal maps)
// Three-channel high dynamic range (HDR) color Three color channels (16 bits:16 bits:16 bits) in "half" floating point* BC6H Direct3D 11 (HDR images)
// Three-channel color, alpha channel optional Three color channels (4 to 7 bits per channel) with 0 to 8 bits of alpha BC7 Direct3D 11 (High quality color maps, Color maps with full alpha)
switch (textureAsset.Alpha)
{
case AlphaFormat.None:
case AlphaFormat.Mask:
// DXT1 handles 1-bit alpha channel
outputFormat = textureAsset.SRgb ? PixelFormat.BC1_UNorm_SRgb : PixelFormat.BC1_UNorm;
break;
case AlphaFormat.Explicit:
// DXT3 is good at sharp alpha transitions
outputFormat = textureAsset.SRgb ? PixelFormat.BC2_UNorm_SRgb : PixelFormat.BC2_UNorm;
break;
case AlphaFormat.Interpolated:
// DXT5 is good at alpha gradients
outputFormat = textureAsset.SRgb ? PixelFormat.BC3_UNorm_SRgb : PixelFormat.BC3_UNorm;
break;
default:
throw new ArgumentOutOfRangeException();
}
// Overrides the format when profile is >= 10.0
// Support some specific optimized formats based on the hint or input type
if (parameters.GraphicsProfile >= GraphicsProfile.Level_10_0)
{
if (hint == TextureHint.NormalMap)
{
outputFormat = PixelFormat.BC5_SNorm;
}
else if (hint == TextureHint.Grayscale)
{
outputFormat = PixelFormat.BC4_UNorm;
}
else if (inputImageFormat.IsHDR())
{
// BC6H is too slow to compile
//outputFormat = parameters.GraphicsProfile >= GraphicsProfile.Level_11_0 && textureAsset.Alpha == AlphaFormat.None ? PixelFormat.BC6H_Uf16 : inputImageFormat;
outputFormat = inputImageFormat;
}
// TODO support the BC6/BC7 but they are so slow to compile that we can't use them right now
}
break;
case GraphicsPlatform.OpenGLES: // OpenGLES on Windows
if (inputImageFormat.IsHDR())
{
outputFormat = inputImageFormat;
}
else if (textureAsset.SRgb)
{
outputFormat = PixelFormat.R8G8B8A8_UNorm_SRgb;
}
else
{
switch (graphicsProfile)
{
case GraphicsProfile.Level_9_1:
case GraphicsProfile.Level_9_2:
case GraphicsProfile.Level_9_3:
outputFormat = textureAsset.Alpha == AlphaFormat.None ? PixelFormat.ETC1 : PixelFormat.R8G8B8A8_UNorm;
break;
case GraphicsProfile.Level_10_0:
case GraphicsProfile.Level_10_1:
case GraphicsProfile.Level_11_0:
case GraphicsProfile.Level_11_1:
case GraphicsProfile.Level_11_2:
// GLES3.0 starting from Level_10_0, this profile enables ETC2 compression on Android
outputFormat = textureAsset.Alpha == AlphaFormat.None ? PixelFormat.ETC1 : PixelFormat.ETC2_RGBA;
break;
default:
throw new ArgumentOutOfRangeException("graphicsProfile");
}
}
break;
default:
// OpenGL on Windows
// TODO: Need to handle OpenGL Desktop compression
outputFormat = textureAsset.SRgb ? PixelFormat.R8G8B8A8_UNorm_SRgb : PixelFormat.R8G8B8A8_UNorm;
break;
}
break;
default:
throw new NotSupportedException("Platform " + parameters.Platform + " is not supported by TextureTool");
}
break;
case TextureFormat.Color16Bits:
if (textureAsset.SRgb)
{
outputFormat = PixelFormat.R8G8B8A8_UNorm_SRgb;
}
else
{
if (textureAsset.Alpha == AlphaFormat.None)
{
outputFormat = PixelFormat.B5G6R5_UNorm;
}
else if (textureAsset.Alpha == AlphaFormat.Mask)
{
outputFormat = PixelFormat.B5G5R5A1_UNorm;
}
}
break;
case TextureFormat.Color32Bits:
if (textureAsset.SRgb)
{
outputFormat = PixelFormat.R8G8B8A8_UNorm_SRgb;
}
break;
case TextureFormat.AsIs:
outputFormat = inputImageFormat;
break;
default:
throw new ArgumentOutOfRangeException();
}
return outputFormat;
}
private static void ImportTextures(IEnumerable<string> textureDependencies, List<AssetItem> assetReferences)
{
if (textureDependencies == null)
return;
foreach (var textureFullPath in textureDependencies.Distinct(x => x))
{
var texturePath = new UFile(textureFullPath);
var source = texturePath;
var texture = new TextureAsset { Source = source, PremultiplyAlpha = false };
// Create asset reference
assetReferences.Add(new AssetItem(texturePath.GetFileName(), texture));
}
}
public static ResultStatus ImportAndSaveTextureImage(UFile sourcePath, string outputUrl, TextureAsset textureAsset, TextureConvertParameters parameters, bool separateAlpha, CancellationToken cancellationToken, Logger logger)
{
var assetManager = new AssetManager();
using (var texTool = new TextureTool())
using (var texImage = texTool.Load(sourcePath))
{
// Apply transformations
texTool.Decompress(texImage);
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
{
return(ResultStatus.Cancelled);
}
// Resize the image
if (textureAsset.IsSizeInPercentage)
{
texTool.Rescale(texImage, textureAsset.Width / 100.0f, textureAsset.Height / 100.0f, Filter.Rescaling.Lanczos3);
}
else
{
texTool.Resize(texImage, (int)textureAsset.Width, (int)textureAsset.Height, Filter.Rescaling.Lanczos3);
}
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
{
return(ResultStatus.Cancelled);
}
// texture size is now determined, we can cache it
var textureSize = new Int2(texImage.Width, texImage.Height);
// Check that the resulting texture size is supported by the targeted graphics profile
if (!TextureSizeSupported(textureAsset.Format, parameters.GraphicsPlatform, parameters.GraphicsProfile, textureSize, textureAsset.GenerateMipmaps, logger))
{
return(ResultStatus.Failed);
}
// Apply the color key
if (textureAsset.ColorKeyEnabled)
{
texTool.ColorKey(texImage, textureAsset.ColorKeyColor);
}
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
{
return(ResultStatus.Cancelled);
}
// Pre-multiply alpha
if (textureAsset.PremultiplyAlpha)
{
texTool.PreMultiplyAlpha(texImage);
}
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
{
return(ResultStatus.Cancelled);
}
// Generate mipmaps
if (textureAsset.GenerateMipmaps)
{
texTool.GenerateMipMaps(texImage, Filter.MipMapGeneration.Box);
}
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
{
return(ResultStatus.Cancelled);
}
// Convert/Compress to output format
// TODO: Change alphaFormat depending on actual image content (auto-detection)?
var outputFormat = DetermineOutputFormat(textureAsset.Format, textureAsset.Alpha, parameters.Platform, parameters.GraphicsPlatform, parameters.GraphicsProfile, textureSize, texImage.Format);
texTool.Compress(texImage, outputFormat, (TextureConverter.Requests.TextureQuality)parameters.TextureQuality);
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
{
return(ResultStatus.Cancelled);
}
// Save the texture
if (separateAlpha)
{
TextureAlphaComponentSplitter.CreateAndSaveSeparateTextures(texTool, texImage, outputUrl, textureAsset.GenerateMipmaps);
}
else
{
using (var outputImage = texTool.ConvertToParadoxImage(texImage))
{
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
{
return(ResultStatus.Cancelled);
}
assetManager.Save(outputUrl, outputImage);
logger.Info("Compression successful [{3}] to ({0}x{1},{2})", outputImage.Description.Width, outputImage.Description.Height, outputImage.Description.Format, outputUrl);
}
}
}
return(ResultStatus.Successful);
}
public static ResultStatus ImportAndSaveTextureImage(UFile sourcePath, string outputUrl, TextureAsset textureAsset, TextureConvertParameters parameters, CancellationToken cancellationToken, Logger logger)
{
var assetManager = new AssetManager();
using (var texTool = new TextureTool())
using (var texImage = texTool.Load(sourcePath, textureAsset.SRgb))
{
// Apply transformations
texTool.Decompress(texImage, textureAsset.SRgb);
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
{
return(ResultStatus.Cancelled);
}
var fromSize = new Size2(texImage.Width, texImage.Height);
var targetSize = new Size2((int)textureAsset.Width, (int)textureAsset.Height);
// Resize the image
if (textureAsset.IsSizeInPercentage)
{
targetSize = new Size2((int)(fromSize.Width * (float)textureAsset.Width / 100.0f), (int)(fromSize.Height * (float)textureAsset.Height / 100.0f));
}
// Find the target size
targetSize = FindBestTextureSize(textureAsset.Format, parameters.GraphicsPlatform, parameters.GraphicsProfile, fromSize, targetSize, textureAsset.GenerateMipmaps, logger);
// Resize the image only if needed
if (targetSize != fromSize)
{
texTool.Resize(texImage, targetSize.Width, targetSize.Height, Filter.Rescaling.Lanczos3);
}
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
{
return(ResultStatus.Cancelled);
}
// texture size is now determined, we can cache it
var textureSize = new Int2(texImage.Width, texImage.Height);
// Apply the color key
if (textureAsset.ColorKeyEnabled)
{
texTool.ColorKey(texImage, textureAsset.ColorKeyColor);
}
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
{
return(ResultStatus.Cancelled);
}
// Pre-multiply alpha
if (textureAsset.PremultiplyAlpha)
{
texTool.PreMultiplyAlpha(texImage);
}
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
{
return(ResultStatus.Cancelled);
}
// Generate mipmaps
if (textureAsset.GenerateMipmaps)
{
var boxFilteringIsSupported = texImage.Format != PixelFormat.B8G8R8A8_UNorm_SRgb || (IsPowerOfTwo(textureSize.X) && IsPowerOfTwo(textureSize.Y));
texTool.GenerateMipMaps(texImage, boxFilteringIsSupported? Filter.MipMapGeneration.Box: Filter.MipMapGeneration.Linear);
}
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
{
return(ResultStatus.Cancelled);
}
// Convert/Compress to output format
// TODO: Change alphaFormat depending on actual image content (auto-detection)?
var outputFormat = DetermineOutputFormat(textureAsset, parameters, textureSize, texImage.Format, parameters.Platform, parameters.GraphicsPlatform, parameters.GraphicsProfile);
texTool.Compress(texImage, outputFormat, (TextureConverter.Requests.TextureQuality)parameters.TextureQuality);
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
{
return(ResultStatus.Cancelled);
}
// Save the texture
if (parameters.SeparateAlpha)
{
//TextureAlphaComponentSplitter.CreateAndSaveSeparateTextures(texTool, texImage, outputUrl, textureAsset.GenerateMipmaps);
}
else
{
using (var outputImage = texTool.ConvertToParadoxImage(texImage))
{
if (cancellationToken.IsCancellationRequested) // abort the process if cancellation is demanded
{
return(ResultStatus.Cancelled);
}
assetManager.Save(outputUrl, outputImage.ToSerializableVersion());
logger.Info("Compression successful [{3}] to ({0}x{1},{2})", outputImage.Description.Width, outputImage.Description.Height, outputImage.Description.Format, outputUrl);
}
}
}
return(ResultStatus.Successful);
}
/// <summary>
/// Determine the output format of the texture depending on the platform and asset properties.
/// </summary>
/// <param name="parameters">The conversion request parameters</param>
/// <param name="graphicsPlatform">The graphics platform</param>
/// <param name="graphicsProfile">The graphics profile</param>
/// <param name="imageSize">The texture output size</param>
/// <param name="inputImageFormat">The pixel format of the input image</param>
/// <param name="textureAsset">The texture asset</param>
/// <returns>The pixel format to use as output</returns>
public static PixelFormat DetermineOutputFormat(TextureAsset textureAsset, TextureConvertParameters parameters, Int2 imageSize, PixelFormat inputImageFormat, PlatformType platform, GraphicsPlatform graphicsPlatform,
GraphicsProfile graphicsProfile)
{
if (textureAsset.SRgb && ((int)parameters.GraphicsProfile < (int)GraphicsProfile.Level_9_2 && parameters.GraphicsPlatform != GraphicsPlatform.Direct3D11))
{
throw new NotSupportedException("sRGB is not supported on OpenGl profile level {0}".ToFormat(parameters.GraphicsProfile));
}
var hint = textureAsset.Hint;
// Default output format
var outputFormat = PixelFormat.R8G8B8A8_UNorm;
switch (textureAsset.Format)
{
case TextureFormat.Compressed:
switch (parameters.Platform)
{
case PlatformType.Android:
if (inputImageFormat.IsHDR())
{
outputFormat = inputImageFormat;
}
else if (textureAsset.SRgb)
{
outputFormat = PixelFormat.R8G8B8A8_UNorm_SRgb;
}
else
{
switch (graphicsProfile)
{
case GraphicsProfile.Level_9_1:
case GraphicsProfile.Level_9_2:
case GraphicsProfile.Level_9_3:
outputFormat = textureAsset.Alpha == AlphaFormat.None ? PixelFormat.ETC1 : PixelFormat.R8G8B8A8_UNorm;
break;
case GraphicsProfile.Level_10_0:
case GraphicsProfile.Level_10_1:
case GraphicsProfile.Level_11_0:
case GraphicsProfile.Level_11_1:
case GraphicsProfile.Level_11_2:
// GLES3.0 starting from Level_10_0, this profile enables ETC2 compression on Android
outputFormat = textureAsset.Alpha == AlphaFormat.None ? PixelFormat.ETC1 : PixelFormat.ETC2_RGBA;
break;
default:
throw new ArgumentOutOfRangeException("graphicsProfile");
}
}
break;
case PlatformType.iOS:
// PVRTC works only for square POT textures
if (textureAsset.SRgb)
{
outputFormat = PixelFormat.R8G8B8A8_UNorm_SRgb;
}
else if (SupportPVRTC(imageSize))
{
switch (textureAsset.Alpha)
{
case AlphaFormat.None:
// DXT1 handles 1-bit alpha channel
outputFormat = PixelFormat.PVRTC_4bpp_RGB;
break;
case AlphaFormat.Mask:
// DXT1 handles 1-bit alpha channel
// TODO: Not sure about the equivalent here?
outputFormat = PixelFormat.PVRTC_4bpp_RGBA;
break;
case AlphaFormat.Explicit:
case AlphaFormat.Interpolated:
// DXT3 is good at sharp alpha transitions
// TODO: Not sure about the equivalent here?
outputFormat = PixelFormat.PVRTC_4bpp_RGBA;
break;
default:
throw new ArgumentOutOfRangeException();
}
}
else
{
outputFormat = PixelFormat.R8G8B8A8_UNorm;
}
break;
case PlatformType.Windows:
case PlatformType.WindowsPhone:
case PlatformType.WindowsStore:
switch (parameters.GraphicsPlatform)
{
case GraphicsPlatform.Direct3D11:
// https://msdn.microsoft.com/en-us/library/windows/desktop/hh308955%28v=vs.85%29.aspx
// http://www.reedbeta.com/blog/2012/02/12/understanding-bcn-texture-compression-formats/
// ---------------------------------------------- ---------------------------------------------------- --- ---------------------------------
// Source data Minimum required data compression resolution Recommended format Minimum supported feature level
// ---------------------------------------------- ---------------------------------------------------- --- ---------------------------------
// Three-channel color with alpha channel Three color channels (5 bits:6 bits:5 bits), with 0 or 1 bit(s) of alpha BC1 Direct3D 9.1 (color maps, cutout color maps - 1 bit alpha, normal maps if memory is tight)
// Three-channel color with alpha channel Three color channels (5 bits:6 bits:5 bits), with 4 bits of alpha BC2 Direct3D 9.1 (idem)
// Three-channel color with alpha channel Three color channels (5 bits:6 bits:5 bits) with 8 bits of alpha BC3 Direct3D 9.1 (color maps with alpha, packing color and mono maps together)
// One-channel color One color channel (8 bits) BC4 Direct3D 10 (Height maps, gloss maps, font atlases, any gray scales image)
// Two-channel color Two color channels (8 bits:8 bits) BC5 Direct3D 10 (Tangent space normal maps)
// Three-channel high dynamic range (HDR) color Three color channels (16 bits:16 bits:16 bits) in "half" floating point* BC6H Direct3D 11 (HDR images)
// Three-channel color, alpha channel optional Three color channels (4 to 7 bits per channel) with 0 to 8 bits of alpha BC7 Direct3D 11 (High quality color maps, Color maps with full alpha)
switch (textureAsset.Alpha)
{
case AlphaFormat.None:
case AlphaFormat.Mask:
// DXT1 handles 1-bit alpha channel
outputFormat = textureAsset.SRgb ? PixelFormat.BC1_UNorm_SRgb : PixelFormat.BC1_UNorm;
break;
case AlphaFormat.Explicit:
// DXT3 is good at sharp alpha transitions
outputFormat = textureAsset.SRgb ? PixelFormat.BC2_UNorm_SRgb : PixelFormat.BC2_UNorm;
break;
case AlphaFormat.Interpolated:
// DXT5 is good at alpha gradients
outputFormat = textureAsset.SRgb ? PixelFormat.BC3_UNorm_SRgb : PixelFormat.BC3_UNorm;
break;
default:
throw new ArgumentOutOfRangeException();
}
// Overrides the format when profile is >= 10.0
// Support some specific optimized formats based on the hint or input type
if (parameters.GraphicsProfile >= GraphicsProfile.Level_10_0)
{
if (hint == TextureHint.NormalMap)
{
outputFormat = PixelFormat.BC5_SNorm;
}
else if (hint == TextureHint.Grayscale)
{
outputFormat = PixelFormat.BC4_UNorm;
}
else if (inputImageFormat.IsHDR())
{
// BC6H is too slow to compile
//outputFormat = parameters.GraphicsProfile >= GraphicsProfile.Level_11_0 && textureAsset.Alpha == AlphaFormat.None ? PixelFormat.BC6H_Uf16 : inputImageFormat;
outputFormat = inputImageFormat;
}
// TODO support the BC6/BC7 but they are so slow to compile that we can't use them right now
}
break;
case GraphicsPlatform.OpenGLES: // OpenGLES on Windows
if (inputImageFormat.IsHDR())
{
outputFormat = inputImageFormat;
}
else if (textureAsset.SRgb)
{
outputFormat = PixelFormat.R8G8B8A8_UNorm_SRgb;
}
else
{
switch (graphicsProfile)
{
case GraphicsProfile.Level_9_1:
case GraphicsProfile.Level_9_2:
case GraphicsProfile.Level_9_3:
outputFormat = textureAsset.Alpha == AlphaFormat.None ? PixelFormat.ETC1 : PixelFormat.R8G8B8A8_UNorm;
break;
case GraphicsProfile.Level_10_0:
case GraphicsProfile.Level_10_1:
case GraphicsProfile.Level_11_0:
case GraphicsProfile.Level_11_1:
case GraphicsProfile.Level_11_2:
// GLES3.0 starting from Level_10_0, this profile enables ETC2 compression on Android
outputFormat = textureAsset.Alpha == AlphaFormat.None ? PixelFormat.ETC1 : PixelFormat.ETC2_RGBA;
break;
default:
throw new ArgumentOutOfRangeException("graphicsProfile");
}
}
break;
default:
// OpenGL on Windows
// TODO: Need to handle OpenGL Desktop compression
outputFormat = textureAsset.SRgb ? PixelFormat.R8G8B8A8_UNorm_SRgb : PixelFormat.R8G8B8A8_UNorm;
break;
}
break;
default:
throw new NotSupportedException("Platform " + parameters.Platform + " is not supported by TextureTool");
}
break;
case TextureFormat.Color16Bits:
if (textureAsset.SRgb)
{
outputFormat = PixelFormat.R8G8B8A8_UNorm_SRgb;
}
else
{
if (textureAsset.Alpha == AlphaFormat.None)
{
outputFormat = PixelFormat.B5G6R5_UNorm;
}
else if (textureAsset.Alpha == AlphaFormat.Mask)
{
outputFormat = PixelFormat.B5G5R5A1_UNorm;
}
}
break;
case TextureFormat.Color32Bits:
if (textureAsset.SRgb)
{
outputFormat = PixelFormat.R8G8B8A8_UNorm_SRgb;
}
break;
case TextureFormat.AsIs:
outputFormat = inputImageFormat;
break;
default:
throw new ArgumentOutOfRangeException();
}
return(outputFormat);
}
