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/*
* Copyright (C) Oscar Shrimpton 2020
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
//! Helper macros, mostly for the graphics pipeline definitions
/// Macro for easily defining buffer attribute descriptions
/// Usage:
/// ```
/// // 0 is the binding value
/// let attributes: Vec<AttributeDesc> = pipeline_vb_attributes!(0,
/// size_of::<f32>() * 3; Rgb32Sfloat
/// size_of::<f32>() * 2; Rg32Sfloat,
/// size_of::<u32>(); R32Sint
/// );
/// ```
/// See the hal::pso::Format enum for possible types
macro_rules! pipeline_vb_attributes {
// Start of recursion
( $binding:expr,
$firstSize:expr; $firstType:ident,
$( $size:expr; $type:ident ),*
) => ({
use hal::pso::{AttributeDesc, Element};
let mut vec = Vec::new();
vec.push(AttributeDesc {
location: 0,
binding: $binding,
element: Element {
format: Format::$firstType,
offset: 0
}
});
pipeline_vb_attributes!(
vec; $binding; 1; $firstSize,
$($size; $type),*
);
vec
});
// Special case for single item
( $binding:expr; $firstSize:expr; $firstType:ident ) => ({
vec![
AttributeDesc {
location: 0,
binding: $binding,
element: Element {
format: Format::$firstType,
offset: $firstSize as u32
}
}
]
});
// Middle of recursion
( $vec:ident; $binding:expr; $location:expr; $prevSize:expr,
$firstSize:expr; $firstType:ident,
$($size:expr; $type:ident),* ) => ({
$vec.push(AttributeDesc {
location: $location,
binding: $binding,
element: Element {
format: Format::$firstType,
offset: $prevSize as u32
}
});
pipeline_vb_attributes!(
$vec; $binding; ($location + 1); ($prevSize + $firstSize),
$($size; $type),*
);
});
// End of recursion
( $vec:ident; $binding:expr; $location:expr; $prevSize:expr,
$firstSize:expr; $firstType:ident ) => ({
$vec.push(AttributeDesc {
location: $location,
binding: $binding,
element: Element {
format: Format::$firstType,
offset: $prevSize as u32
}
});
});
}
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