Struct glitter::texture::VariantTexture2d [−] [src]

pub struct VariantTexture2d;

This is a unit type that is used to be coerced into select enum variants.

In OpenGL, the GL_TEXTURE_2D enum value is used for multiple purposes. In particular, it can be used as both a valid argument for glBindTexture (where it represents a possible texture binding, which maps to TextureBindingTarget::Texture2d in glitter) and for glTexImage2D (where it represents the possible 2D images that make up a particular texture type, which maps to the ImageTargetType trait and the Tx2dImageTarget enum in glitter).

Thus, in order to be able to use the constant glitter::TEXTURE_2D as an argument to the image_2d method, glitter::TEXTURE_2D must be of type TextureBindingTarget. But, in order to be able to it as an argument to a method that takes Tx2dImageTarget, it must be of type [Tx2dImageTarget] both types, so this type exists solely to be the type of glitter::TEXTURE_2D, and it implements From so that it can be converted to either type freely.