mirror of
https://github.com/italicsjenga/vello.git
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80 lines
2.3 KiB
Rust
80 lines
2.3 KiB
Rust
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// Copyright 2021 The piet-gpu authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Also licensed under MIT license, at your choice.
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//! Macros, mostly to automate backend selection tedium.
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#[macro_export]
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macro_rules! mux {
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( #[cfg(vk)] $($tokens:tt)* ) => {
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#[cfg(not(target_os="macos"))] $( $tokens )*
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};
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( #[cfg(dx12)] $($tokens:tt)* ) => {
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#[cfg(target_os="windows")] $( $tokens )*
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};
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}
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#[macro_export]
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macro_rules! mux_enum {
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( $(#[$outer:meta])* $v:vis enum $name:ident {
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Vk($vk:ty),
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Dx12($dx12:ty),
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} ) => {
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$(#[$outer])* $v enum $name {
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#[cfg(not(target_os="macos"))]
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Vk($vk),
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#[cfg(target_os="windows")]
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Dx12($dx12),
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}
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impl $name {
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$crate::mux! {
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#[cfg(vk)]
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#[allow(unused)]
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fn vk(&self) -> &$vk {
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match self {
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$name::Vk(x) => x,
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_ => panic!("downcast error")
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}
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}
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}
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$crate::mux! {
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#[cfg(dx12)]
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#[allow(unused)]
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fn dx12(&self) -> &$dx12 {
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match self {
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$name::Dx12(x) => x,
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_ => panic!("downcast error")
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}
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}
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}
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}
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};
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}
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macro_rules! mux_device_enum {
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( $(#[$outer:meta])* $assoc_type: ident) => {
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$crate::mux_enum! {
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$(#[$outer])*
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pub enum $assoc_type {
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Vk(<$crate::vulkan::VkDevice as $crate::Device>::$assoc_type),
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Dx12(<$crate::dx12::Dx12Device as $crate::Device>::$assoc_type),
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}
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}
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}
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}
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