emilk/egui · error

Tried to update a texture that has not been allocated yet.

Error message

Tried to update a texture that has not been allocated yet.

What it means

egui_wgpu::Renderer::update_texture removes the texture record from its internal map before rebuilding it; if no texture was allocated under that TextureId, the map remove returns None and the renderer panics with 'Tried to update a texture that has not been allocated yet.' Update only works on existing allocations — creating one requires register_native_texture or free_texture/allocation via egui.

Solutions

1. Allocate the texture first (via egui's texture allocator / renderer textures map) before calling update_texture.
2. Guard updates so they only run for TextureIds currently registered; skip or allocate-on-demand otherwise.
3. Don't free_texture an id you still plan to update later in the same session; verify id provenance across Renderer instances.

Example fix

// before
renderer.update_texture(&device, &queue, tex_id, &rgba_image); // tex_id never allocated
// after
let tex_id = renderer.register_native_texture(&device, &texture_view, wgpu::FilterMode::Linear);
renderer.update_texture(&device, &queue, tex_id, &rgba_image);

// Check allocation first:
if !renderer.textures.read().unwrap().contains_key(&tex_id) { /* allocate before update */ }

fn texture_allocated(renderer: &egui_wgpu::Renderer, id: egui::TextureId) -> bool { renderer.textures.read().map(|t| t.contains_key(&id)).unwrap_or(false) }

// Panic on missing id; pre-validate ids in app code: keep a HashSet<TextureId> of allocated ids and check before update_texture.

When it happens

Trigger: Calling renderer.update_texture with a TextureId that was never allocated (never passed via egui's texture management or register_native_texture), or one already freed with free_texture; also updating the special user texture id (TextureId::User) that was never registered.

Common situations: Off-by-one or stale TextureId after a texture was freed and reallocated; egui app updates a texture in a callback before the first allocation frame; mixing textures across two Renderer instances; using a native texture handle id with update_texture instead of the proper path.

Understand the failure class

Background: 'Could not be found', 'does not exist', 'not found in database': the resource-not-found family when an ID, slug, key, or URI lookup comes back empty — this error's family across 20 libraries.

Related errors

• Tried to update user texture.
• You must call .update_buffers() before .render()
• Failed to create image
• Failed to create render state
• Failed to create staging buffer for index data. Index count

AI-assisted analysis of emilk/egui@441971a776 (2026-09-12). Data as JSON: /api/errors/df3c0acddbc99695. Report an issue: GitHub.

Appendix: source

Thrown at crates/egui-wgpu/src/renderer.rs:699

                },
                size,
            );
        };

        // Use same label for all resources associated with this texture id (no point in retyping the type)
        let label_str = format!("egui_texid_{id:?}");
        let label = Some(label_str.as_str());

        let (texture, origin, bind_group) = if let Some(pos) = image_delta.pos {
            // update the existing texture
            let Texture {
                texture,
                bind_group,
                options,
            } = self
                .textures
                .remove(&id)
                .expect("Tried to update a texture that has not been allocated yet.");
            let texture = texture.expect("Tried to update user texture.");
            let options = options.expect("Tried to update user texture.");
            let origin = wgpu::Origin3d {
                x: pos[0] as u32,
                y: pos[1] as u32,
                z: 0,
            };

            (
                texture,
                origin,
                // If the TextureOptions are the same as the previous ones, we can reuse the bind group. Otherwise we
                // have to recreate it.
                if image_delta.options == options {
                    Some(bind_group)
                } else {
                    None
                },

View on GitHub (pinned to 441971a776)