mod context;
mod effect_pipeline;
mod mask_feather;
mod sdf_pipeline;
mod shader_registry;

use thiserror::Error;

pub use wgpu;
pub use context::GpuContext;
pub use effect_pipeline::{ApplyEffectsOptions, EffectPass, UniformValue};
pub use mask_feather::ApplyMaskFeatherOptions;

pub const GPU_TEXTURE_FORMAT: wgpu::TextureFormat = wgpu::TextureFormat::Bgra8Unorm;

#[derive(Debug, Error)]
pub enum GpuError {
    #[error("No WebGPU adapter is available")]
    AdapterUnavailable,
    #[error("Failed to request a WebGPU device: {0}")]
    RequestDevice(#[from] wgpu::RequestDeviceError),
    #[error("Failed to create a WebGPU surface: {0}")]
    CreateSurface(#[from] wgpu::CreateSurfaceError),
    #[error("The output surface does not support the required texture format")]
    UnsupportedSurfaceFormat,
    #[error("Unknown effect shader '{shader}'")]
    UnknownEffectShader { shader: String },
    #[error("Missing uniform '{uniform}' for shader '{shader}'")]
    MissingUniform { shader: String, uniform: String },
    #[error("Uniform '{uniform}' for shader '{shader}' must be a number")]
    InvalidNumberUniform { shader: String, uniform: String },
    #[error("Uniform '{uniform}' for shader '{shader}' must be a vector of length {expected_length}")]
    InvalidVectorUniform {
        shader: String,
        uniform: String,
        expected_length: usize,
    },
    #[error("Shader '{shader}' does not support uniform '{uniform}'")]
    UnsupportedUniform { shader: String, uniform: String },
}