The second version of my DXT compressor is now available for release here.
It now uses FreeImage to provide support for virtually all image formats, and uses a heavily optimized Squish implementation for better performance and quality.
Changes:
Normalizing normal maps is now correct.
Changed the DXT conversion routine to use the Squish library.
Added an x64 version (performance improved by at least 210%).
Fixed a bug where the filters for mipmaps were being ignored (instead changing the normal resample filter).
Negative gamma values now act as a switch to use true IEC 61966-2-1 compliant sRGB conversions to and from linear space for all resampling (VAL = VAL <= 0.04045f ? VAL * (1.0f / 12.92f) : ::powf( (VAL + 0.055f) * (1.0f / 1.055f), 2.4f)).
Here is a list of the commands:
| -file <path> | Input file to process. There can be multiple of these. |
| -outfile <path> | Output file for the last -file input. By default, if no output file is specified, the default for any given input is the same as the input path but with a .dds extension. This allows to optionally override this default. |
| -dxt1c | Exports as DXT1 (color only). |
| -dxt1a | Exports as DXT1 (1-bit alpha). |
| -dxt2 | Exports as DXT2. |
| -dxt3 | Exports as DXT3. Default. |
| -dxt4 | Exports as DXT4. |
| -dxt5 | Exports as DXT5. |
| -A8B8G8R8 | Exports as uncompressed A8B8G8R8 format. |
| -G16R16 | Exports as uncompressed G16R16 format. |
| -A2B10G10R10 | Exports as uncompressed A2B10G10R10 format. |
| -A1R5G5B5 | Exports as uncompressed A1R5G5B5 format. |
| -R5G6B5 | Exports as uncompressed R5G6B5 format. |
| -A8 | Exports as uncompressed A8 format. |
| -A8R8G8B8 | Exports as uncompressed A8R8G8B8 format. |
| -X8R8G8B8 | Exports as uncompressed X8R8G8B8 format. |
| -X8B8G8R8 | Exports as uncompressed X8B8G8R8 format. |
| -A2R10G10B10 | Exports as uncompressed A2R10G10B10 format. |
| -R8G8B8 | Exports as uncompressed R8G8B8 format. |
| -X1R5G5B5 | Exports as uncompressed X1R5G5B5 format. |
| -A4R4G4B4 | Exports as uncompressed A4R4G4B4 format. |
| -X4R4G4B4 | Exports as uncompressed X4R4G4B4 format. |
| -A8R3G3B2 | Exports as uncompressed A8R3G3B2 format. |
| -A8L8 | Exports as uncompressed A8L8 format. |
| -L16 | Exports as uncompressed L16 format. |
| -L8 | Exports as uncompressed L8 format. |
| -A4L4 | Exports as uncompressed A4L4 format. |
| -quick | When used with a DXT format, low quality and high speed are used for the compression. Deprecated. |
| -quality_normal | When used with a DXT format, medium quality and speed are used for the compression. Deprecated. |
| -quality_production | When used with a DXT format, high quality and low speed are used for the compression. Deprecated. |
| -quality_highest | When used with a DXT format, maximum quality and lowest speed are used for the compression. Deprecated. |
| -prescale <int> <int> | Rescales the image(s) to this size before converting. |
| -rescale <nearest | hi | lo> | Rescales the image(s) to nearest, next-highest or next-lowest power of two. |
| -rel_scale <float> <float> | Relative scale of the original image(s). 0.5 is half size. Default is 1.0 1.0 |
| -RescalePoint | Rescales the image using a point filter. |
| -RescaleBox | Rescales the image using a box filter. |
| -RescaleKaiser | Rescales the image using a Kaiser filter. |
| -RescaleLanczos3 | Rescales the image using a Lanczos3 filter. |
| -RescaleLanczos4 | Rescales the image using a Lanczos4 filter. |
| -RescaleLanczos6 | Rescales the image using a Lanczos6 filter. |
| -RescaleLanczos8 | Rescales the image using a Lanczos8 filter. |
| -RescaleLanczos12 | Rescales the image using a Lanczos12 filter. |
| -RescaleLanczos64 | Rescales the image using a Lanczos64 filter. |
| -RescaleMitchell | Rescales the image using a Mitchell filter. |
| -RescaleCatrom | Rescales the image using a Catmull-Rom filter. |
| -RescaleBlackman | Rescales the image using a Blackman filter. |
| -RescaleGaussian | Rescales the image using a Gaussian filter. |
| -RescaleBell | Rescales the image using a Bell filter. |
| -Point | A point filter will be used for mipmaps. |
| -Box | A box filter will be used for mipmaps. |
| -Kaiser | A Kaiser filter will be used for mipmaps. |
| -Lanczos3 | A Lanczos3 filter will be used for mipmaps. |
| -Lanczos4 | A Lanczos4 filter will be used for mipmaps. |
| -Lanczos6 | A Lanczos6 filter will be used for mipmaps. |
| -Lanczos8 | A Lanczos8 filter will be used for mipmaps. |
| -Lanczos12 | A Lanczos12 filter will be used for mipmaps. |
| -Lanczos64 | A Lanczos64 filter will be used for mipmaps. |
| -Mitchell | A Mitchell filter will be used for mipmaps. |
| -Catrom | A Catmull-Rom filter will be used for mipmaps. |
| -Blackman | A Blackman filter will be used for mipmaps. |
| -Gaussian | A Gaussian filter will be used for mipmaps. |
| -Bell | A Bell filter will be used for mipmaps. |
| -clamp <int> <int> | Clamps the image width and height between the given values. |
| -nomipmap | If specified, mipmaps are not generated. |
| -nmips <int> | Specifies the maximum number of mipmaps to generate. |
| -rgbe | Specifies that the input image(s) is/are in linear space already. |
| -flip | Flips the image vertically. |
| -swap | Swaps the R and B channels. |
| -norm | Normalizes the image for each mipmap level. Used for normal maps. |
| -weight <float> <float> <float> | Specifies the weights to be used during DXT compression. Defaults are 0.212639005871510 0.715168678767756 0.072192315360734. |
| -gamma <float> | Specifies the gamma to use during resampling and mipmap generation. Any negative values cause it to use the full IEC 61966-2-1 compliant conversion rather than a pow() approximation (all values below 0 are treated equally). Default is -2.2 (full standard conversion). |
| -alpha_threshold <int> | Specifies the cut-off for DXT1a alpha. Values below this point are treated as alpha = 0. Valid range is 0 to 255. |
| -pause | Pauses the console after completing the operation. |
Examples:
| “LSDxt x64.exe” -file “image.png” -nmips 5 | Creates image.dds with a maximum of 5 mipmap levels. DXT3 format is used. |
| “LSDxt x64.exe” -file “image0.png” -file “image1.png” | Creates image0.dds and image1.dds. DXT3 format is used. |
| “LSDxt x64.exe” -file “image0.png” -file “image1.png” -outfile “main.dds” | Creates image0.dds and main.dds. DXT3 format is used. |
| “LSDxt x64.exe” -file “image.png” -rescale hi -ResampleBox -Blackman | Rescales the image to the next-highest power-of-2 if it is not already a power-of-2. The rescale uses a box filter while mipmaps use a Blackman filter. DXT3 format is used. |
| “LSDxt x64.exe” -file “image.png” -weight 0.3086 0.6094 0.082 | Creates a DXT3 image named image.dds with custom RGB weights of 0.3086 0.6094 0.082. |
Many more commands will follow in future releases, including options for converting heightmaps to normal maps, fading alpha levels in mipmaps, sharpening mipmaps, etc.
L. Spiro
