zed-industries/zed · error

error locating fragment function

Error message

error locating fragment function

What it means

Same as the vertex-function lookup but for the fragment shader function: library.get_function returned None. Indicates the Metal library doesn't contain the expected fragment entry point — mismatched or outdated shader artifacts.

Source

Thrown at crates/gpui_apple/src/metal_renderer.rs:1289

    }

    RgbaImage::from_raw(width, height, pixels).context("failed to create RgbaImage from pixel data")
}

fn build_pipeline_state(
    device: &metal::DeviceRef,
    library: &metal::LibraryRef,
    label: &str,
    vertex_fn_name: &str,
    fragment_fn_name: &str,
    pixel_format: metal::MTLPixelFormat,
) -> metal::RenderPipelineState {
    let vertex_fn = library
        .get_function(vertex_fn_name, None)
        .expect("error locating vertex function");
    let fragment_fn = library
        .get_function(fragment_fn_name, None)
        .expect("error locating fragment function");

    let descriptor = metal::RenderPipelineDescriptor::new();
    descriptor.set_label(label);
    descriptor.set_vertex_function(Some(vertex_fn.as_ref()));
    descriptor.set_fragment_function(Some(fragment_fn.as_ref()));
    let color_attachment = descriptor.color_attachments().object_at(0).unwrap();
    color_attachment.set_pixel_format(pixel_format);
    color_attachment.set_blending_enabled(true);
    color_attachment.set_rgb_blend_operation(metal::MTLBlendOperation::Add);
    color_attachment.set_alpha_blend_operation(metal::MTLBlendOperation::Add);
    color_attachment.set_source_rgb_blend_factor(metal::MTLBlendFactor::SourceAlpha);
    color_attachment.set_source_alpha_blend_factor(metal::MTLBlendFactor::One);
    color_attachment.set_destination_rgb_blend_factor(metal::MTLBlendFactor::OneMinusSourceAlpha);
    color_attachment.set_destination_alpha_blend_factor(metal::MTLBlendFactor::One);

    device
        .new_render_pipeline_state(&descriptor)
        .expect("could not create render pipeline state")

View on GitHub (pinned to 9d272b0363)

Solutions

1. Verify fragment_fn_name exists in the compiled library
2. Rebuild shaders together with the renderer code
3. Inspect library.function_names() at runtime to diagnose mismatches

When it happens

Trigger: Thrown at crates/gpui_apple/src/metal_renderer.rs:1282 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of zed-industries/zed@9d272b0363 (2026-08-20). Data as JSON: /api/errors/a3508cb20ccce396. Report an issue: GitHub.