183 lines
7.6 KiB
Markdown
183 lines
7.6 KiB
Markdown
# Ash
|
|
|
|
A very lightweight wrapper around Vulkan
|
|
|
|
[](LICENSE-MIT)
|
|
[](LICENSE-APACHE)
|
|
[](https://docs.rs/ash)
|
|
[](https://travis-ci.org/MaikKlein/ash)
|
|
[](https://ci.appveyor.com/project/MaikKlein/ash/branch/master)
|
|
[](https://gitter.im/MaikKlein/ash?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
|
|
[](https://crates.io/crates/ash)
|
|
[](https://github.com/MaikKlein/ash)
|
|
|
|
## Overview
|
|
- [x] A true Vulkan API without compromises
|
|
- [x] Convenience features that don't limit the functionality
|
|
- [x] Additional type safety
|
|
- [x] Device local function pointer loading
|
|
- [x] No validation, everything is **unsafe**
|
|
- [x] Generated from `vk.xml`
|
|
|
|
## Features
|
|
### Explicit returns with `Result`
|
|
```Rust
|
|
// function signature
|
|
pub fn create_instance(&self,
|
|
create_info: &vk::InstanceCreateInfo,
|
|
allocation_callbacks: Option<&vk::AllocationCallbacks>)
|
|
-> Result<Instance, InstanceError> { .. }
|
|
let instance = entry.create_instance(&create_info, None)
|
|
.expect("Instance creation error");
|
|
```
|
|
|
|
|
|
### `Vec<T>` instead of mutable slices
|
|
|
|
```Rust
|
|
pub fn get_swapchain_images_khr(&self,
|
|
swapchain: vk::SwapchainKHR)
|
|
-> VkResult<Vec<vk::Image>>;
|
|
let present_images = swapchain_loader.get_swapchain_images_khr(swapchain).unwrap();
|
|
```
|
|
*Note*: Functions don't return `Vec<T>` if this would limit the functionality. See `p_next`.
|
|
|
|
### Slices
|
|
```Rust
|
|
pub fn cmd_pipeline_barrier(&self,
|
|
command_buffer: vk::CommandBuffer,
|
|
src_stage_mask: vk::PipelineStageFlags,
|
|
dst_stage_mask: vk::PipelineStageFlags,
|
|
dependency_flags: vk::DependencyFlags,
|
|
memory_barriers: &[vk::MemoryBarrier],
|
|
buffer_memory_barriers: &[vk::BufferMemoryBarrier],
|
|
image_memory_barriers: &[vk::ImageMemoryBarrier]);
|
|
```
|
|
|
|
### Default implementation for all types
|
|
```Rust
|
|
// No need to manually set the structure type
|
|
let desc_alloc_info = vk::DescriptorSetAllocateInfo {
|
|
descriptor_pool: self.pool,
|
|
descriptor_set_count: self.layouts.len() as u32,
|
|
p_set_layouts: self.layouts.as_ptr(),
|
|
..Default::default()
|
|
};
|
|
```
|
|
### Builder pattern
|
|
```Rust
|
|
let pipeline_vertex_input_state_create_info = vk::PipelineVertexInputStateCreateInfo::builder()
|
|
.vertex_binding_descriptions(&Vertex::binding_descriptions())
|
|
.vertex_attribute_descriptions(&Vertex::attribute_descriptions()).build();
|
|
```
|
|
*Note*: No validation is done, the lifetimes only have to live as long as the builder object. It is the responsibility of the user to make sure that the pointers are valid.
|
|
### Flags and constants as associated constants
|
|
|
|
```Rust
|
|
// Bitflag
|
|
vk::AccessFlags::COLOR_ATTACHMENT_READ | vk::AccessFlags::COLOR_ATTACHMENT_WRITE
|
|
```
|
|
|
|
```Rust
|
|
// Constant
|
|
vk::PipelineBindPoint::GRAPHICS,
|
|
```
|
|
### Debug/Display for Flags
|
|
|
|
```Rust
|
|
let flag = vk::AccessFlags::COLOR_ATTACHMENT_READ
|
|
| vk::AccessFlags::COLOR_ATTACHMENT_WRITE;
|
|
println!("Debug: {:?}", flag);
|
|
println!("Display: {}", flag);
|
|
// Prints:
|
|
// Debug: AccessFlags(110000000)
|
|
// Display: COLOR_ATTACHMENT_READ | COLOR_ATTACHMENT_WRITE
|
|
```
|
|
|
|
### Interop
|
|
Vulkan objects inside Ash can be constructed from raw values with `Object::from:raw`. Useful if you need to interact with a C library.
|
|
```Rust
|
|
PipelineBindPoint::from_raw(bindpoint);
|
|
```
|
|
|
|
### Function pointer loading
|
|
Ash also takes care of loading the function pointers. Function pointers are split into 3 categories, Entry, Instance and Device. The reason for not loading it into a global is that in Vulkan you can have multiple devices and each device will load its own function pointers to achieve better performance. Click [here](https://github.com/KhronosGroup/Vulkan-LoaderAndValidationLayers/blob/master/loader/LoaderAndLayerInterface.md) for more information.
|
|
|
|
### Extension loading
|
|
Additionally, every Vulkan extension has to be loaded explicitly. You can find all extensions under [ash::extensions](https://github.com/MaikKlein/ash/tree/master/ash/src/extensions).
|
|
```Rust
|
|
use ash::extensions::Swapchain;
|
|
let swapchain_loader = Swapchain::new(&instance, &device);
|
|
let swapchain = swapchain_loader.create_swapchain_khr(&swapchain_create_info).unwrap();
|
|
```
|
|
|
|
### Raw function pointers
|
|
|
|
Raw function pointers are available, if something hasn't been exposed yet in the higher level API. Please open an issue if anything is missing.
|
|
|
|
```Rust
|
|
device.fp_v1_0().destroy_device(...);
|
|
```
|
|
|
|
### Support for extension names
|
|
```Rust
|
|
use ash::extensions::{Swapchain, XlibSurface, Surface, DebugReport};
|
|
#[cfg(all(unix, not(target_os = "android")))]
|
|
fn extension_names() -> Vec<*const i8> {
|
|
vec![
|
|
Surface::name().as_ptr(),
|
|
XlibSurface::name().as_ptr(),
|
|
DebugReport::name().as_ptr()
|
|
]
|
|
}
|
|
```
|
|
|
|
### Implicit handles
|
|
Handles from Instance or Device are passed implicitly.
|
|
```Rust
|
|
pub fn create_command_pool(&self,
|
|
create_info: &vk::CommandPoolCreateInfo)
|
|
-> VkResult<vk::CommandPool>;
|
|
|
|
let pool = device.create_command_pool(&pool_create_info).unwrap();
|
|
```
|
|
|
|
## Example
|
|
You can find the examples [here](https://github.com/MaikKlein/ash/tree/master/examples).
|
|
All examples currently require: the LunarG Validation layers and a Vulkan library that is visible in your `PATH`. An easy way to get started is to use the [LunarG Vulkan SDK](https://lunarg.com/vulkan-sdk/)
|
|
#### Windows
|
|
Make sure that you have a Vulkan ready driver and install the [LunarG Vulkan SDK](https://lunarg.com/vulkan-sdk/).
|
|
#### Linux
|
|
Make sure that you have a Vulkan ready driver and install the [LunarG Vulkan SDK](https://lunarg.com/vulkan-sdk/). You also have to add the library and layers to your path. Have a look at my [post](http://askubuntu.com/a/803110/77183) if you are unsure how to do that.
|
|
### [Triangle](https://github.com/MaikKlein/ash/blob/master/examples/src/bin/triangle.rs)
|
|
Displays a triangle with vertex colors.
|
|
```
|
|
cd examples
|
|
cargo run --bin triangle
|
|
```
|
|
#### macOS
|
|
Install the [LunarG Vulkan SDK](https://lunarg.com/vulkan-sdk/). This basically entails extracting the downloaded tarball to any location you choose and then setting a few environment variables. Specifically, if `SDK_PATH` is set to the root extracted SDK directory,
|
|
|
|
* `DYLD_LIBRARY_PATH = $SDK_PATH/macOS/lib`
|
|
* `VK_ICD_FILENAMES = $SDK_PATH/macOS/etc/vulkan/icd.d/MoltenVK_icd.json`
|
|
* `VK_LAYER_PATH = $SDK_PATH/macOS/etc/vulkan/explicit_layer.d`
|
|
|
|
|
|
|
|
### [Texture](https://github.com/MaikKlein/ash/blob/master/examples/src/bin/texture.rs)
|
|
Displays a texture on a quad.
|
|
```
|
|
cd examples
|
|
cargo run --bin texture
|
|
```
|
|
|
|
|
|
## A thanks to
|
|
|
|
* [Api with no secrets](https://software.intel.com/en-us/articles/api-without-secrets-introduction-to-vulkan-part-1)
|
|
* [Vulkan tutorial](http://av.dfki.de/~jhenriques/development.html)
|
|
* [Vulkan examples](https://github.com/SaschaWillems/Vulkan)
|
|
* [Vulkan tutorial](https://vulkan-tutorial.com/)
|
|
* [Vulkano](https://github.com/tomaka/vulkano/)
|
|
* [vk-rs](https://github.com/Osspial/vk-rs)
|