Setting custom textures

[chrisboyce]

I see in the docs that the Image widget takes a TextureId, but I can't figure out how to actually set the texture. In the back end, I see the set_user_texture function in the Painter impl for egui_glium , but I can't figure out how to get access to that struct from within the updated method. I'm using the equi_template as the starting point.

[emilk]

You use the tex_allocator() method in epi::Frame: https://docs.rs/epi/0.8.0/epi/struct.Frame.html#method.tex_allocator

let tex_allocator = frame.tex_allocator().unwrap();
let texture_id = tex_allocator.alloc_srgba_premultiplied(size, pixels);

[lucasw]

If the color values of pixels are changed (but not the size), does alloc_srgba_premultiplied have to be called every update? That's what I'm doing now and it works, but I'm wondering if that is doing a lot of unnecessary work in addition to updating the texture.

[emilk]

As long as you free the previous texture it should be fine.

[vojty]

This might sound like completely stupid question, but where should I free the textures?
I'm trying to render 400 squares (8x8 pixels), which are constantly changing

EDIT: I'm dumb, ignore me, I don't need 400 textures, I can do it with just one :)

[emilk]

Just in case: TextureAllocator also has free method: https://docs.rs/epi/0.9.0/epi/trait.TextureAllocator.html#tymethod.free