gfx-rs/wgpu · error

not implemented

Error message

not implemented

What it means

Panic in naga's SPIR-V backend image-type mapping (from_inner): an image whose class does not map to any Vulkan image kind (e.g. External) reached the catch-all unimplemented arm, so no LocalImageType can be produced.

Source

Thrown at naga/src/back/spv/mod.rs:389

                flags: make_flags(multi, ImageTypeFlags::SAMPLED),
                image_format: spirv::ImageFormat::Unknown,
            },
            crate::ImageClass::Depth { multi } => LocalImageType {
                sampled_type: crate::Scalar {
                    kind: crate::ScalarKind::Float,
                    width: 4,
                },
                dim,
                flags: make_flags(multi, ImageTypeFlags::DEPTH | ImageTypeFlags::SAMPLED),
                image_format: spirv::ImageFormat::Unknown,
            },
            crate::ImageClass::Storage { format, access: _ } => LocalImageType {
                sampled_type: format.into(),
                dim,
                flags: make_flags(false, ImageTypeFlags::empty()),
                image_format: format.into(),
            },
            crate::ImageClass::External => unimplemented!(),
        }
    }
}

/// A numeric type, for use in [`LocalType`].
#[derive(Debug, PartialEq, Hash, Eq, Copy, Clone)]
enum NumericType {
    Scalar(crate::Scalar),
    Vector {
        size: crate::VectorSize,
        scalar: crate::Scalar,
    },
    Matrix {
        columns: crate::VectorSize,
        rows: crate::VectorSize,
        scalar: crate::Scalar,
    },
}

View on GitHub (pinned to 3e11ff59bf)

Solutions

1. Restrict shader images to Storage, Sampled, or Depth classes when emitting SPIR-V
2. Report a proper validation error upstream for unsupported image classes instead of panicking

When it happens

Trigger: Thrown at naga/src/back/spv/mod.rs:389 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of gfx-rs/wgpu@3e11ff59bf (2026-09-03). Data as JSON: /api/errors/3243dd91d960f0d9. Report an issue: GitHub.