hal/gles: bind group creation

wgpu-core/src/device/mod.rs

@@ -1035,7 +1035,8 @@ impl<A: HalApi> Device<A> {
                 })?;
         }
 
-        let hal_bindings = entry_map.values().cloned().collect::<Vec<_>>();
+        let mut hal_bindings = entry_map.values().cloned().collect::<Vec<_>>();
+        hal_bindings.sort_by_key(|b| b.binding);
         let hal_desc = hal::BindGroupLayoutDescriptor {
             label,
             entries: &hal_bindings,

wgpu-hal/src/gles/command.rs

@@ -173,15 +173,15 @@ impl crate::CommandEncoder<super::Api> for super::CommandEncoder {
 
     unsafe fn set_bind_group(
         &mut self,
-        layout: &Resource,
+        layout: &super::PipelineLayout,
         index: u32,
-        group: &Resource,
+        group: &super::BindGroup,
         dynamic_offsets: &[wgt::DynamicOffset],
     ) {
     }
     unsafe fn set_push_constants(
         &mut self,
-        layout: &Resource,
+        layout: &super::PipelineLayout,
         stages: wgt::ShaderStage,
         offset: u32,
         data: &[u32],

wgpu-hal/src/gles/device.rs

@@ -1,6 +1,6 @@
 use super::{DeviceResult, Resource}; //TEMP
 use glow::HasContext;
-use std::{convert::TryInto, ptr::NonNull};
+use std::{convert::TryInto, ptr::NonNull, sync::Arc};
 
 impl crate::Device<super::Api> for super::Device {
     unsafe fn exit(self) {
@@ -46,6 +46,7 @@ impl crate::Device<super::Api> for super::Device {
         Ok(super::Buffer {
             raw,
             target,
+            size: desc.size,
             map_flags,
         })
     }
@@ -269,24 +270,122 @@ impl crate::Device<super::Api> for super::Device {
     unsafe fn create_bind_group_layout(
         &self,
         desc: &crate::BindGroupLayoutDescriptor,
-    ) -> DeviceResult<Resource> {
-        Ok(Resource)
+    ) -> Result<super::BindGroupLayout, crate::DeviceError> {
+        Ok(super::BindGroupLayout {
+            entries: Arc::from(desc.entries),
+        })
     }
-    unsafe fn destroy_bind_group_layout(&self, bg_layout: Resource) {}
+    unsafe fn destroy_bind_group_layout(&self, _bg_layout: super::BindGroupLayout) {}
+
     unsafe fn create_pipeline_layout(
         &self,
         desc: &crate::PipelineLayoutDescriptor<super::Api>,
-    ) -> DeviceResult<Resource> {
-        Ok(Resource)
+    ) -> Result<super::PipelineLayout, crate::DeviceError> {
+        let mut group_infos = Vec::with_capacity(desc.bind_group_layouts.len());
+        let mut num_samplers = 0u8;
+        let mut num_textures = 0u8;
+        let mut num_uniform_buffers = 0u8;
+        let mut num_storage_buffers = 0u8;
+
+        for bg_layout in desc.bind_group_layouts {
+            // create a vector with the size enough to hold all the bindings, filled with `!0`
+            let mut binding_to_slot = vec![
+                !0;
+                bg_layout
+                    .entries
+                    .last()
+                    .map_or(0, |b| b.binding as usize + 1)
+            ]
+            .into_boxed_slice();
+
+            for entry in bg_layout.entries.iter() {
+                let counter = match entry.ty {
+                    wgt::BindingType::Sampler { .. } => &mut num_samplers,
+                    wgt::BindingType::Texture { .. } | wgt::BindingType::StorageTexture { .. } => {
+                        &mut num_textures
+                    }
+                    wgt::BindingType::Buffer {
+                        ty: wgt::BufferBindingType::Uniform,
+                        ..
+                    } => &mut num_uniform_buffers,
+                    wgt::BindingType::Buffer {
+                        ty: wgt::BufferBindingType::Storage { .. },
+                        ..
+                    } => &mut num_storage_buffers,
+                };
+
+                binding_to_slot[entry.binding as usize] = *counter;
+                *counter += entry.count.map_or(1, |c| c.get() as u8);
+            }
+
+            group_infos.push(super::BindGroupLayoutInfo {
+                entries: Arc::clone(&bg_layout.entries),
+                binding_to_slot,
+            });
+        }
+
+        Ok(super::PipelineLayout {
+            group_infos: group_infos.into_boxed_slice(),
+        })
     }
-    unsafe fn destroy_pipeline_layout(&self, pipeline_layout: Resource) {}
+    unsafe fn destroy_pipeline_layout(&self, pipeline_layout: super::PipelineLayout) {}
+
     unsafe fn create_bind_group(
         &self,
         desc: &crate::BindGroupDescriptor<super::Api>,
-    ) -> DeviceResult<Resource> {
-        Ok(Resource)
+    ) -> Result<super::BindGroup, crate::DeviceError> {
+        let mut contents = Vec::new();
+
+        for (entry, layout) in desc.entries.iter().zip(desc.layout.entries.iter()) {
+            let binding = match layout.ty {
+                wgt::BindingType::Buffer { ty, .. } => {
+                    let bb = &desc.buffers[entry.resource_index as usize];
+                    let register = match ty {
+                        wgt::BufferBindingType::Uniform => super::BindingRegister::UniformBuffers,
+                        wgt::BufferBindingType::Storage { .. } => {
+                            super::BindingRegister::StorageBuffers
+                        }
+                    };
+                    super::RawBinding::Buffer {
+                        register,
+                        raw: bb.buffer.raw,
+                        offset: bb.offset as i32,
+                        size: match bb.size {
+                            Some(s) => s.get() as i32,
+                            None => (bb.buffer.size - bb.offset) as i32,
+                        },
+                    }
+                }
+                wgt::BindingType::Sampler { .. } => {
+                    let sampler = desc.samplers[entry.resource_index as usize];
+                    super::RawBinding::Sampler(sampler.raw)
+                }
+                wgt::BindingType::Texture { .. } | wgt::BindingType::StorageTexture { .. } => {
+                    match *desc.textures[entry.resource_index as usize].view {
+                        super::TextureView::Renderbuffer { .. } => {
+                            panic!("Unable to use a renderbuffer in a group")
+                        }
+                        super::TextureView::Texture {
+                            raw,
+                            target,
+                            ref range,
+                        } => super::RawBinding::Texture {
+                            raw,
+                            target,
+                            range: range.clone(),
+                        },
+                    }
+                }
+            };
+            contents.push(binding);
+        }
+
+        Ok(super::BindGroup {
+            layout_entries: Arc::clone(&desc.layout.entries),
+            contents: contents.into_boxed_slice(),
+        })
     }
-    unsafe fn destroy_bind_group(&self, group: Resource) {}
+    unsafe fn destroy_bind_group(&self, _group: super::BindGroup) {}
 
     unsafe fn create_shader_module(
         &self,

wgpu-hal/src/gles/mod.rs

@@ -41,9 +41,9 @@ impl crate::Api for Api {
     type QuerySet = Resource;
     type Fence = Resource;
 
-    type BindGroupLayout = Resource;
-    type BindGroup = Resource;
-    type PipelineLayout = Resource;
+    type BindGroupLayout = BindGroupLayout;
+    type BindGroup = BindGroup;
+    type PipelineLayout = PipelineLayout;
     type ShaderModule = Resource;
     type RenderPipeline = Resource;
     type ComputePipeline = Resource;
@@ -190,6 +190,7 @@ pub struct Queue {
 pub struct Buffer {
     raw: glow::Buffer,
     target: BindTarget,
+    size: wgt::BufferAddress,
     map_flags: u32,
 }
 
@@ -239,6 +240,53 @@ pub struct Sampler {
     raw: glow::Sampler,
 }
 
+pub struct BindGroupLayout {
+    entries: Arc<[wgt::BindGroupLayoutEntry]>,
+}
+
+struct BindGroupLayoutInfo {
+    entries: Arc<[wgt::BindGroupLayoutEntry]>,
+    /// Mapping of resources, indexed by `binding`, into the whole layout space.
+    /// For texture resources, the value is the texture slot index.
+    /// For sampler resources, the value is the index of the sampler in the whole layout.
+    /// For buffers, the value is the uniform or storage slot index.
+    /// For unused bindings, the value is `!0`
+    binding_to_slot: Box<[u8]>,
+}
+
+pub struct PipelineLayout {
+    group_infos: Box<[BindGroupLayoutInfo]>,
+}
+
+#[derive(Debug)]
+enum BindingRegister {
+    Textures,
+    UniformBuffers,
+    StorageBuffers,
+}
+
+#[derive(Debug)]
+enum RawBinding {
+    Buffer {
+        register: BindingRegister,
+        raw: glow::Buffer,
+        offset: i32,
+        size: i32,
+    },
+    Texture {
+        raw: glow::Texture,
+        target: BindTarget,
+        range: wgt::ImageSubresourceRange,
+    },
+    Sampler(glow::Sampler),
+}
+
+#[derive(Debug)]
+pub struct BindGroup {
+    layout_entries: Arc<[wgt::BindGroupLayoutEntry]>,
+    contents: Box<[RawBinding]>,
+}
+
 #[derive(Debug)]
 struct TextureCopyInfo {
     external_format: u32,

wgpu-hal/src/lib.rs

@@ -238,6 +238,7 @@ pub trait Device<A: Api>: Send + Sync {
     ) -> Result<A::CommandEncoder, DeviceError>;
     unsafe fn destroy_command_encoder(&self, pool: A::CommandEncoder);
 
+    /// Creates a bind group layout.
     unsafe fn create_bind_group_layout(
         &self,
         desc: &BindGroupLayoutDescriptor,
@@ -753,6 +754,10 @@ pub struct SamplerDescriptor<'a> {
     pub border_color: Option<wgt::SamplerBorderColor>,
 }
 
+/// BindGroupLayout descriptor.
+///
+/// Valid usage:
+/// - `entries` are sorted by ascending `wgt::BindGroupLayoutEntry::binding`
 #[derive(Clone, Debug)]
 pub struct BindGroupLayoutDescriptor<'a> {
     pub label: Label<'a>,

wgpu-hal/src/metal/device.rs

@@ -363,11 +363,8 @@ impl crate::Device<super::Api> for super::Device {
         &self,
         desc: &crate::BindGroupLayoutDescriptor,
     ) -> DeviceResult<super::BindGroupLayout> {
-        let mut map = desc.entries.to_vec();
-        map.sort_by_key(|e| e.binding);
-
         Ok(super::BindGroupLayout {
-            entries: Arc::new(map),
+            entries: Arc::from(desc.entries),
         })
     }
     unsafe fn destroy_bind_group_layout(&self, _bg_layout: super::BindGroupLayout) {}

wgpu-hal/src/metal/mod.rs

@@ -412,7 +412,7 @@ impl Sampler {
 #[derive(Debug)]
 pub struct BindGroupLayout {
     /// Sorted list of BGL entries.
-    entries: Arc<Vec<wgt::BindGroupLayoutEntry>>,
+    entries: Arc<[wgt::BindGroupLayoutEntry]>,
 }
 
 #[derive(Clone, Debug, Default)]

wgpu-hal/src/vulkan/device.rs

@@ -937,7 +937,7 @@ impl crate::Device<super::Api> for super::Device {
         Ok(super::BindGroupLayout {
             raw,
             desc_count,
-            types,
+            types: types.into_boxed_slice(),
         })
     }
     unsafe fn destroy_bind_group_layout(&self, bg_layout: super::BindGroupLayout) {

wgpu-hal/src/vulkan/mod.rs

@@ -271,7 +271,7 @@ pub struct Sampler {
 pub struct BindGroupLayout {
     raw: vk::DescriptorSetLayout,
     desc_count: gpu_descriptor::DescriptorTotalCount,
-    types: Vec<(vk::DescriptorType, u32)>,
+    types: Box<[(vk::DescriptorType, u32)]>,
 }
 
 #[derive(Debug)]