glraw is an utility that converts Qt-supported images into an OpenGL-compatible raw format. glraw reduces the process of loading textures at run-time to a minimum: A file-content dump into GPU memory.
With glraw you can preconvert your texture assets and load them without the need of any image library. The generated raw files can easily be read. For this, glraw also provides a minimal Raw-File reader that you can either source-copy or integrate as C++ library into your project. Image to OpenGL texture conversion can be done either by glraws command line interface, e.g., within an existing tool-chain, or at run-time with glraw linked as asset library (requires linking Qt).
Using the command line interface to create, e.g., an uncompressed 8bit rgb-texture looks like this:
>glraw-cmd -f GL_RGB -t GL_UNSIGNED_BYTE image.png
When converting an input image, glraw allows basic operations on the input-image and gives you full control over format and type of your targeted asset specification:
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Output format and type: Choose either a format and a type (e.g.,
GL_RGBandGL_UNSIGNED_BYTE) or one of the supported compressed formats (e.g.,GL_COMPRESSED_RGBA_S3TC_DXT3_EXT). -
Mirroring: Mirror images horizontally or vertically.
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Scaling: Scale your images either to a choosen size in pixels or by a factor.
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Arbitrary image processing: Provide your own GLSL shader for, e.g., blurring, sharpening, color conversion, or data encoding.
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Extensible file header: glraw supports two formats:
- .raw as a true raw format, where all asset meta information is either encoded in the file name or aggreed with the importer.
- .glraw, which extends the raw data by an arbitrary file header of binary key-value pairs (e.g., width, height, compression).
- Use Cases: Examples for using texture compression and user-defined image processing.
- Supported Formats and Types: List of all currently supported OpenGL format-type combinations.
- glraw File Format: Description of the extended raw format (.glraw).
- Installation on Mac OS X: Explanation about how to install glraw on Mac OS X with Homebrew
- Doxygen Documentation: A glraw source documentation.
The following dev-libraries and programs need to be provided for correct project configuration:
- C++11 compatible compiler (e.g. gcc 4.8, VS 2013)
- CMake (>= 2.8.9): http://www.cmake.org/
- Qt5 (>= 5.2): http://www.qt-project.org/