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//! Convenience macros

/// Macro to produce an array of [`VertexAttribute`](crate::VertexAttribute).
///
/// Output has type: `[VertexAttribute; _]`. Usage is as follows:
/// ```
/// # use wgpu::vertex_attr_array;
/// let attrs = vertex_attr_array![0 => Float32x2, 1 => Float32, 2 => Uint16x4];
/// ```
/// This example specifies a list of three [`VertexAttribute`](crate::VertexAttribute),
/// each with the given `shader_location` and `format`.
/// Offsets are calculated automatically.
#[macro_export]
macro_rules! vertex_attr_array {
    ($($loc:expr => $fmt:ident),* $(,)?) => {
        $crate::vertex_attr_array!([] ; 0; $($loc => $fmt ,)*)
    };
    ([$($t:expr,)*] ; $off:expr ;) => { [$($t,)*] };
    ([$($t:expr,)*] ; $off:expr ; $loc:expr => $item:ident, $($ll:expr => $ii:ident ,)*) => {
        $crate::vertex_attr_array!(
            [$($t,)*
            $crate::VertexAttribute {
                format: $crate::VertexFormat :: $item,
                offset: $off,
                shader_location: $loc,
            },];
            $off + $crate::VertexFormat :: $item.size();
            $($ll => $ii ,)*
        )
    };
}

#[test]
fn test_vertex_attr_array() {
    use std::mem::size_of;

    let attrs = vertex_attr_array![0 => Float32x2, 3 => Uint16x4];
    // VertexAttribute does not support PartialEq, so we cannot test directly
    assert_eq!(attrs.len(), 2);
    assert_eq!(attrs[0].offset, 0);
    assert_eq!(attrs[0].shader_location, 0);
    assert_eq!(attrs[1].offset, size_of::<(f32, f32)>() as u64);
    assert_eq!(attrs[1].shader_location, 3);
}

/// Macro to load a SPIR-V module statically.
///
/// It ensures the word alignment as well as the magic number.
///
/// Return type: [`crate::ShaderModuleDescriptor`]
#[macro_export]
#[cfg(feature = "spirv")]
macro_rules! include_spirv {
    ($($token:tt)*) => {
        {
            //log::info!("including '{}'", $($token)*);
            $crate::ShaderModuleDescriptor {
                label: Some($($token)*),
                source: $crate::util::make_spirv(include_bytes!($($token)*)),
            }
        }
    };
}

/// Macro to load raw SPIR-V data statically, for use with [`Features::SPIRV_SHADER_PASSTHROUGH`].
///
/// It ensures the word alignment as well as the magic number.
///
/// [`Features::SPIRV_SHADER_PASSTHROUGH`]: crate::Features::SPIRV_SHADER_PASSTHROUGH
#[macro_export]
macro_rules! include_spirv_raw {
    ($($token:tt)*) => {
        {
            //log::info!("including '{}'", $($token)*);
            $crate::ShaderModuleDescriptorSpirV {
                label: Some($($token)*),
                source: $crate::util::make_spirv_raw(include_bytes!($($token)*)),
            }
        }
    };
}

/// Load WGSL source code from a file at compile time.
///
/// The loaded path is relative to the path of the file containing the macro call, in the same way
/// as [`include_str!`] operates.
///
/// ```ignore
/// fn main() {
///     let module: ShaderModuleDescriptor = include_wgsl!("shader.wgsl");
/// }
/// ```
#[macro_export]
macro_rules! include_wgsl {
    ($($token:tt)*) => {
        {
            //log::info!("including '{}'", $($token)*);
            $crate::ShaderModuleDescriptor {
                label: Some($($token)*),
                source: $crate::ShaderSource::Wgsl(std::borrow::Cow::Borrowed(include_str!($($token)*))),
            }
        }
    };
}