Function azul_core::gl::insert_into_active_gl_textures

pub fn insert_into_active_gl_textures(
    pipeline_id: PipelineId, 
    epoch: Epoch, 
    texture: Texture
) -> ExternalImageId

Inserts a new texture into the OpenGL texture cache, returns a new image ID for the inserted texture

This function exists so azul doesn't have to use lazy_static as a dependency