# ANGLE back-ends This folder contains shared back-end-specific implementation files. The classes and types in `renderer` are not specified by GLES. They instead are common to all the various ANGLE implementations. See [`renderer_utils.h`](renderer_utils.h) for various cross back-end utilties. ## ANGLE Formats The ANGLE format class, [`angle::Format`][ANGLEFormatDef], works as a union between GLES and all the various back-end formats. It can represent any type of format in ANGLE. e.g. Formats in Vulkan that don't exist in GLES, or DXGI formats that don't exist in GLES, or Windows/Android surface configs that don't exist anywhere else. The `glInternalFormat` member of `angle::Format` represents the "closest" GL format for an ANGLE format. For formats that don't exist in GLES this will not be exactly what the format represents. The back-ends also define their own format tables. See the [Vulkan Format table docs][VulkanFormatDocs] and the [D3D11 format table docs][D23D11FormatDocs]. ## DXGI Format Info DXGI formats are used in both the GL and D3D11 back-end. Therefore the generated info table lives in this common shared location. The DXGI info table is generated by [`gen_dxgi_format_table.py`](gen_dxgi_format_table.py) and sources data from [`dxgi_format_data.json`](dxgi_format_data.json). The main purpose of the table is to convert from a DXGI format to an ANGLE format, where the ANGLE format should have all the necessary information. [ANGLEFormatDef]: https://chromium.googlesource.com/angle/angle/+/f85ec039a7dcfde3b4a8d9ddfa8baa84ae5ce927/src/libANGLE/renderer/Format.h#24 [VulkanFormatDocs]: vulkan/doc/FormatTablesAndEmulation.md [D3D11FormatDocs]: d3d/d3d11/FormatTables.md