Add binding model types

src/binding_model.rs

@@ -1,6 +1,76 @@
 use hal;
 
+use {BindGroupLayoutHandle, BufferHandle, SamplerHandle, TextureViewHandle};
+
+bitflags! {
+    #[repr(transparent)]
+    pub struct ShaderStageFlags: u32 {
+        const NONE = 0;
+        const VERTEX = 1;
+        const FRAGMENT = 2;
+        const COMPUTE = 4;
+    }
+}
+
+#[repr(C)]
+pub enum BindingType {    
+    UniformBuffer = 0,
+    Sampler = 1,
+    SampledTexture = 2,
+    StorageBuffer = 3,
+}
+
+#[repr(C)]
+pub struct BindGroupLayoutBinding {
+    pub binding: u32,
+    pub visibility: ShaderStageFlags,
+    pub ty: BindingType,
+}
+
+#[repr(C)]
+pub struct BindGroupLayoutDescriptor<'a> {
+    pub bindings: &'a [BindGroupLayoutBinding],
+}
+
+pub struct BindGroupLayout {
+    // TODO
+}
+
+#[repr(C)]
+pub struct PipelineLayoutDescriptor<'a> {
+    pub bind_group_layouts: &'a [BindGroupLayoutHandle],
+}
 
 pub struct PipelineLayout<B: hal::Backend> {
     raw: B::PipelineLayout,
 }
+
+#[repr(C)]
+pub struct BufferBinding {
+    pub buffer: BufferHandle,
+    pub offset: u32,
+    pub size: u32,
+}
+
+#[repr(C)]
+pub enum BindingResource {
+    Buffer(BufferBinding),
+    Sampler(SamplerHandle),
+    TextureView(TextureViewHandle),
+}
+
+#[repr(C)]
+pub struct Binding {
+    pub binding: u32,
+    pub resource: BindingResource,
+}
+
+#[repr(C)]
+pub struct BindGroupDescriptor<'a> {
+    pub layout: BindGroupLayout,
+    pub bindings: &'a [Binding],
+}
+
+pub struct BindGroup {
+    // TODO
+}

src/conv.rs

@@ -37,4 +37,4 @@ pub(crate) fn map_buffer_usage(usage: resource::BufferUsageFlags) -> (hal::buffe
     }
 
     (hal_usage, hal_memory)
-}
+}

src/lib.rs

@@ -58,7 +58,13 @@ pub type AdapterHandle = Handle<hal::Adapter<B>>;
 pub type DeviceHandle = Handle<Device<B>>;
 pub type BufferHandle = Handle<Buffer<B>>;
 
+// Resource
+pub type TextureViewHandle = Handle<TextureView>;
+pub type TextureHandle = Handle<Texture>;
+pub type SamplerHandle = Handle<Sampler>;
+
 // Binding model
+pub type BindGroupLayoutHandle = Handle<BindGroupLayout>;
 pub type PipelineLayoutHandle = Handle<PipelineLayout<B>>;
 
 // Pipeline