First bits of the API with extern C functions

.gitignore

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+
+/target
+**/*.rs.bk
+Cargo.lock

Cargo.toml

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+[package]
+name = "gpu"
+version = "0.1.0"
+authors = ["Dzmitry Malyshau <kvark@mozilla.com>"]
+
+[features]
+default = ["gfx-backend-vulkan"]
+
+[dependencies]
+gfx-hal = { git = "https://github.com/gfx-rs/gfx" }
+gfx-backend-vulkan = { git = "https://github.com/gfx-rs/gfx", optional = true }

src/command.rs

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+use hal;
+
+pub struct CommandBuffer<B: hal::Backend> {
+    raw: B::CommandBuffer,
+}
+
+pub struct RenderPass<B: hal::Backend> {
+    raw: B::CommandBuffer,
+}
+
+pub struct ComputePass<B: hal::Backend> {
+    raw: B::CommandBuffer,
+}

src/device.rs

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+use hal;
+
+
+pub type BufferUsage = hal::buffer::Usage;
+
+#[repr(C)]
+pub struct BufferDescriptor {
+    pub size: u64,
+    pub usage: BufferUsage,
+}
+
+#[repr(C)]
+pub struct CommandBufferDescriptor {
+}
+
+pub struct Device<B: hal::Backend> {
+    pub raw: B::Device,
+}
+
+pub struct Buffer<B: hal::Backend> {
+    pub raw: B::Buffer,
+}

src/handle.rs

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+use std::{borrow, cmp, fmt, ops, ptr};
+#[cfg(feature = "nightly")]
+use std::sync::{Arc, Mutex};
+
+#[cfg(feature = "nightly")]
+use hal::backend::FastHashMap;
+
+#[cfg(feature = "nightly")]
+lazy_static! {
+    static ref REGISTRY: Arc<Mutex<FastHashMap<usize, &'static str>>> = Arc::new(Mutex::new(FastHashMap::default()));
+}
+
+#[repr(C)]
+pub struct Handle<T>(*mut T);
+
+#[cfg(feature = "nightly")]
+impl Handle<()> {
+    pub fn report_leaks() {
+        println!("Leaked handles:");
+        let mut map = REGISTRY.lock().unwrap();
+        for (_, type_id) in map.drain() {
+            println!("\t{:?}", type_id);
+        }
+    }
+}
+
+impl<T: 'static> Handle<T> {
+    pub fn new(value: T) -> Self {
+        let ptr = Box::into_raw(Box::new(value));
+        #[cfg(feature = "nightly")]
+        {
+            use std::intrinsics::type_name;
+            let name = unsafe { type_name::<T>() };
+            REGISTRY.lock().unwrap().insert(ptr as _, name);
+        }
+        Handle(ptr)
+    }
+
+    pub fn null() -> Self {
+        Handle(ptr::null_mut())
+    }
+
+    pub fn unbox(self) -> Option<T> {
+        if self.0.is_null() {
+            None
+        } else {
+            #[cfg(feature = "nightly")]
+            {
+                REGISTRY.lock().unwrap().remove(&(self.0 as _)).unwrap();
+            }
+            Some(*unsafe { Box::from_raw(self.0) })
+        }
+    }
+
+    pub fn as_ref(&self) -> Option<&T> {
+        unsafe { self.0.as_ref() }
+    }
+}
+
+impl<T> Handle<T> {
+    #[cfg(feature = "nightly")]
+    #[inline]
+    fn check(&self) {
+        assert!(REGISTRY.lock().unwrap().contains_key(&(self.0 as _)));
+    }
+    #[cfg(not(feature = "nightly"))]
+    #[inline]
+    fn check(&self) {
+        debug_assert!(!self.0.is_null());
+    }
+}
+
+impl<T> Clone for Handle<T> {
+    fn clone(&self) -> Self {
+        Handle(self.0)
+    }
+}
+
+impl<T> Copy for Handle<T> {}
+
+impl<T> ops::Deref for Handle<T> {
+    type Target = T;
+    fn deref(&self) -> &T {
+        self.check();
+        unsafe { &*self.0 }
+    }
+}
+
+impl<T> ops::DerefMut for Handle<T> {
+    fn deref_mut(&mut self) -> &mut T {
+        self.check();
+        unsafe { &mut *self.0 }
+    }
+}
+
+impl<T> borrow::Borrow<T> for Handle<T> {
+    fn borrow(&self) -> &T {
+        self.check();
+        unsafe { &*self.0 }
+    }
+}
+
+impl<T> cmp::PartialEq for Handle<T> {
+    fn eq(&self, other: &Self) -> bool {
+        self.0.eq(&other.0)
+    }
+}
+
+impl<T> fmt::Debug for Handle<T> {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        write!(formatter, "Handle({:p})", self.0)
+    }
+}

src/instance.rs

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+//use hal;
+
+#[repr(C)]
+pub enum PowerPreference {
+    Default = 0,
+    LowPower = 1,
+    HighPerformance = 2,
+}
+
+#[repr(C)]
+pub struct AdapterDescriptor {
+    pub power_preference: PowerPreference,
+}
+
+#[repr(C)]
+pub struct Extensions {
+    anisotropicFiltering: bool,
+}
+
+#[repr(C)]
+pub struct DeviceDescriptor {
+    pub extension: Extensions,
+}

src/lib.rs

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+extern crate gfx_hal as hal;
+#[cfg(feature = "gfx-backend-vulkan")]
+extern crate gfx_backend_vulkan as back;
+
+mod command;
+mod device;
+mod handle;
+mod instance;
+
+use back::Backend as B;
+use hal::Device;
+
+use handle::Handle;
+
+
+pub type InstanceHandle = Handle<back::Instance>;
+pub type AdapterHandle = Handle<hal::Adapter<B>>;
+pub type DeviceHandle = Handle<device::Device<B>>;
+pub type BufferHandle = Handle<device::Buffer<B>>;
+pub type CommandBufferHandle = Handle<command::CommandBuffer<B>>;
+pub type RenderPassHandle = Handle<command::RenderPass<B>>;
+pub type ComputePassHandle = Handle<command::ComputePass<B>>;
+
+// Instance logic
+
+pub extern "C"
+fn create_instance() -> InstanceHandle {
+    unimplemented!()
+}
+
+pub extern "C"
+fn instance_get_adapter(
+    instance: InstanceHandle, desc: instance::AdapterDescriptor
+) -> AdapterHandle {
+    unimplemented!()
+}
+
+pub extern "C"
+fn adapter_create_device(
+    adapter: AdapterHandle, desc: instance::DeviceDescriptor
+) -> DeviceHandle {
+    unimplemented!()
+}
+
+// Device logic
+
+pub extern "C"
+fn device_create_buffer(
+    device: DeviceHandle, desc: device::BufferDescriptor
+) -> BufferHandle {
+    //let unbound = device.raw.create_buffer(desc.size, desc.usage).unwrap();
+    //let reqs = device.raw.get_buffer_requirements(&unbound);
+    unimplemented!()
+}
+
+pub extern "C"
+fn device_create_command_buffer(
+    device: DeviceHandle, desc: device::CommandBufferDescriptor
+) -> CommandBufferHandle {
+    unimplemented!()
+}
+
+// Command Buffer logic
+
+pub extern "C"
+fn command_buffer_begin_render_pass(
+    command_buffer: CommandBufferHandle
+) -> RenderPassHandle {
+    unimplemented!()
+}
+
+pub extern "C"
+fn command_buffer_begin_compute_pass(
+) -> ComputePassHandle {
+    unimplemented!()
+}
+
+// Render Pass logic
+
+pub extern "C"
+fn render_pass_draw(
+    pass: RenderPassHandle, vertex_count: u32, instance_count: u32, first_vertex: u32, first_instance: u32
+) {
+    unimplemented!()
+}
+
+pub extern "C"
+fn render_pass_draw_indexed(
+    pass: RenderPassHandle, index_count: u32, instance_count: u32, first_index: u32, vertex_offset: i32, first_instance: u32
+) {
+    unimplemented!()
+}
+
+pub extern "C"
+fn render_pass_end(pass: RenderPassHandle) -> CommandBufferHandle {
+    unimplemented!()
+}