Type Definition libktx_rs_sys::ktx_transcode_fmt_e

type ktx_transcode_fmt_e = c_uint;

@~English @brief Enumerators for specifying the transcode target format.

For BasisU/ETC1S format, @e Opaque and @e alpha here refer to 2 separate RGB images, a.k.a slices within the BasisU compressed data. For UASTC format they refer to the RGB and the alpha components of the UASTC data. If the original image had only 2 components, R will be in the opaque portion and G in the alpha portion. The R value will be replicated in the RGB components. In the case of BasisU the G value will be replicated in all 3 components of the alpha slice. If the original image had only 1 component it’s value is replicated in all 3 components of the opaque portion and there is no alpha.

@note You should not transcode sRGB encoded data to @c KTX_TTF_BC4_R, @c KTX_TTF_BC5_RG, @c KTX_TTF_ETC2_EAC_R{,G}11, @c KTX_TTF_RGB565, @c KTX_TTF_BGR565 or @c KTX_TTF_RGBA4444 formats as neither OpenGL nor Vulkan support sRGB variants of these. Doing sRGB decoding in the shader will not produce correct results if any texture filtering is being used.