Add unsafe support for push constants

TROUBLES.md

@@ -29,3 +29,5 @@
 - This repository contains the `vulkano-shaders` library, which generates Rust code that uses the `vulkano` library. If the API of `vulkano` gets
   a breaking change, there is no way to enforce or to check the fact that the user uses a correct combination of versions for `vulkano-shaders`
   and `vulkano`.
+
+- No way to set the alignment of a struct member, or to force the size of a struct to be a multiple of a certain size.

vulkano/examples/image.rs

@@ -220,7 +220,7 @@ fn main() {
             .draw_inline(&renderpass, &framebuffer, renderpass::ClearValues {
                 color: [0.0, 0.0, 1.0, 1.0]
             })
-            .draw(&pipeline, &vertex_buffer, &vulkano::command_buffer::DynamicState::none(), set.clone())
+            .draw(&pipeline, &vertex_buffer, &vulkano::command_buffer::DynamicState::none(), set.clone(), &())
             .draw_end()
             .build().unwrap()
     }).collect::<Vec<_>>();

vulkano/examples/teapot.rs

@@ -216,7 +216,7 @@ fn main() {
                  depth: 1.0,
              })
             .draw_indexed(&pipeline, (&vertex_buffer, &normals_buffer), &index_buffer,
-                          &vulkano::command_buffer::DynamicState::none(), &set)
+                          &vulkano::command_buffer::DynamicState::none(), &set, &())
             .draw_end()
             .build().unwrap()
     }).collect::<Vec<_>>();

vulkano/examples/triangle.rs

@@ -237,7 +237,7 @@ fn main() {
     let command_buffers = framebuffers.iter().map(|framebuffer| {
         vulkano::command_buffer::PrimaryCommandBufferBuilder::new(&cb_pool).unwrap()
             .draw_inline(&renderpass, &framebuffer, ([0.0, 0.0, 1.0, 1.0],))
-            .draw(&pipeline, vertex_buffer.clone(), &vulkano::command_buffer::DynamicState::none(), ())
+            .draw(&pipeline, vertex_buffer.clone(), &vulkano::command_buffer::DynamicState::none(), (), &())
             .draw_end()
             .build().unwrap()
     }).collect::<Vec<_>>();

vulkano/src/command_buffer/inner.rs

@@ -686,15 +686,15 @@ impl InnerCommandBufferBuilder {
 
     /// Calls `vkCmdDraw`.
     // FIXME: push constants
-    pub unsafe fn draw<V, Pv, Pl, L, Rp>(mut self, pipeline: &Arc<GraphicsPipeline<Pv, Pl, Rp>>,
+    pub unsafe fn draw<V, Pv, Pl, L, Rp, Pc>(mut self, pipeline: &Arc<GraphicsPipeline<Pv, Pl, Rp>>,
                              vertices: V, dynamic: &DynamicState,
-                             sets: L) -> InnerCommandBufferBuilder
+                             sets: L, push_constants: &Pc) -> InnerCommandBufferBuilder
         where Pv: 'static + VertexDefinition + VertexSource<V>, L: DescriptorSetsCollection + Send + Sync,
-              Pl: 'static + PipelineLayout + Send + Sync, Rp: 'static + Send + Sync
+              Pl: 'static + PipelineLayout + Send + Sync, Rp: 'static + Send + Sync, Pc: 'static + Clone
     {
         // FIXME: add buffers to the resources
 
-        self.bind_gfx_pipeline_state(pipeline, dynamic, sets);
+        self.bind_gfx_pipeline_state(pipeline, dynamic, sets, push_constants);
 
         let vertices = pipeline.vertex_definition().decode(vertices);
 
@@ -727,17 +727,18 @@ impl InnerCommandBufferBuilder {
 
     /// Calls `vkCmdDrawIndexed`.
     // FIXME: push constants
-    pub unsafe fn draw_indexed<'a, V, Pv, Pl, Rp, L, I, Ib, Ibb>(mut self, pipeline: &Arc<GraphicsPipeline<Pv, Pl, Rp>>,
+    pub unsafe fn draw_indexed<'a, V, Pv, Pl, Rp, L, I, Ib, Ibb, Pc>(mut self, pipeline: &Arc<GraphicsPipeline<Pv, Pl, Rp>>,
                                                           vertices: V, indices: Ib, dynamic: &DynamicState,
-                                                          sets: L) -> InnerCommandBufferBuilder
+                                                          sets: L, push_constants: &Pc) -> InnerCommandBufferBuilder
         where L: DescriptorSetsCollection + Send + Sync,
               Pv: 'static + VertexDefinition + VertexSource<V>,
               Pl: 'static + PipelineLayout + Send + Sync, Rp: 'static + Send + Sync,
-              Ib: Into<BufferSlice<'a, [I], Ibb>>, I: 'static + Index, Ibb: Buffer + 'static
+              Ib: Into<BufferSlice<'a, [I], Ibb>>, I: 'static + Index, Ibb: Buffer + 'static,
+              Pc: 'static + Clone
     {
         // FIXME: add buffers to the resources
 
-        self.bind_gfx_pipeline_state(pipeline, dynamic, sets);
+        self.bind_gfx_pipeline_state(pipeline, dynamic, sets, push_constants);
 
 
         let indices = indices.into();
@@ -830,10 +831,10 @@ impl InnerCommandBufferBuilder {
         }
     }
 
-    fn bind_gfx_pipeline_state<V, Pl, L, Rp>(&mut self, pipeline: &Arc<GraphicsPipeline<V, Pl, Rp>>,
+    fn bind_gfx_pipeline_state<V, Pl, L, Rp, Pc>(&mut self, pipeline: &Arc<GraphicsPipeline<V, Pl, Rp>>,
-                                             dynamic: &DynamicState, sets: L)
+                                                 dynamic: &DynamicState, sets: L, push_constants: &Pc)
         where V: 'static + VertexDefinition + Send + Sync, L: DescriptorSetsCollection + Send + Sync,
-              Pl: 'static + PipelineLayout + Send + Sync, Rp: 'static + Send + Sync
+              Pl: 'static + PipelineLayout + Send + Sync, Rp: 'static + Send + Sync, Pc: 'static + Clone
     {
         unsafe {
             //assert!(sets.is_compatible_with(pipeline.layout()));
@@ -905,6 +906,18 @@ impl InnerCommandBufferBuilder {
             for d in descriptor_sets.iter() { self.keep_alive.push(mem::transmute(d.clone()) /* FIXME: */); }
             let mut descriptor_sets = Some(descriptor_sets.into_iter().map(|set| set.inner_descriptor_set().internal_object()).collect::<SmallVec<[_; 32]>>());
 
+            if mem::size_of_val(push_constants) >= 1 {
+                let pipeline = PipelineLayout::inner_pipeline_layout(&**pipeline.layout()).internal_object();
+                let size = mem::size_of_val(push_constants);
+                let push_constants = push_constants.clone();
+                assert!((size % 4) == 0);
+
+                self.render_pass_staging_commands.push(Box::new(move |vk, cmd| {
+                    vk.CmdPushConstants(cmd, pipeline, 0x7fffffff, 0, size as u32,
+                                        &push_constants as *const Pc as *const _);
+                }));
+            }
+
             // FIXME: input attachments of descriptor sets have to be checked against input
             //        attachments of the render pass
 

vulkano/src/command_buffer/outer.rs

@@ -281,17 +281,17 @@ pub struct PrimaryCommandBufferBuilderInlineDraw {
 impl PrimaryCommandBufferBuilderInlineDraw {
     /// Calls `vkCmdDraw`.
     // FIXME: push constants
-    pub fn draw<V, L, Pv, Pl, Rp>(self, pipeline: &Arc<GraphicsPipeline<Pv, Pl, Rp>>,
+    pub fn draw<V, L, Pv, Pl, Rp, Pc>(self, pipeline: &Arc<GraphicsPipeline<Pv, Pl, Rp>>,
-                              vertices: V, dynamic: &DynamicState, sets: L)
+                              vertices: V, dynamic: &DynamicState, sets: L, push_constants: &Pc)
                               -> PrimaryCommandBufferBuilderInlineDraw
         where Pv: VertexDefinition + VertexSource<V> + 'static, Pl: PipelineLayout + 'static + Send + Sync, Rp: 'static + Send + Sync,
-              L: DescriptorSetsCollection + Send + Sync
+              L: DescriptorSetsCollection + Send + Sync, Pc: 'static + Clone
     {
         // FIXME: check subpass
 
         unsafe {
             PrimaryCommandBufferBuilderInlineDraw {
-                inner: self.inner.draw(pipeline, vertices, dynamic, sets),
+                inner: self.inner.draw(pipeline, vertices, dynamic, sets, push_constants),
                 num_subpasses: self.num_subpasses,
                 current_subpass: self.current_subpass,
             }
@@ -299,18 +299,18 @@ impl PrimaryCommandBufferBuilderInlineDraw {
     }
 
     /// Calls `vkCmdDrawIndexed`.
-    pub fn draw_indexed<'a, V, L, Pv, Pl, Rp, I, Ib, Ibb>(self, pipeline: &Arc<GraphicsPipeline<Pv, Pl, Rp>>,
+    pub fn draw_indexed<'a, V, L, Pv, Pl, Rp, I, Ib, Ibb, Pc>(self, pipeline: &Arc<GraphicsPipeline<Pv, Pl, Rp>>,
                                               vertices: V, indices: Ib, dynamic: &DynamicState,
-                                              sets: L) -> PrimaryCommandBufferBuilderInlineDraw
+                                              sets: L, push_constants: &Pc) -> PrimaryCommandBufferBuilderInlineDraw
         where Pv: 'static + VertexDefinition + VertexSource<V> + Send + Sync, Pl: 'static + PipelineLayout + Send + Sync, Rp: 'static + Send + Sync,
               Ib: Into<BufferSlice<'a, [I], Ibb>>, I: 'static + Index, Ibb: Buffer + 'static + Send + Sync,
-              L: DescriptorSetsCollection + Send + Sync
+              L: DescriptorSetsCollection + Send + Sync, Pc: 'static + Clone
     {
         // FIXME: check subpass
 
         unsafe {
             PrimaryCommandBufferBuilderInlineDraw {
-                inner: self.inner.draw_indexed(pipeline, vertices, indices, dynamic, sets),
+                inner: self.inner.draw_indexed(pipeline, vertices, indices, dynamic, sets, push_constants),
                 num_subpasses: self.num_subpasses,
                 current_subpass: self.current_subpass,
             }
@@ -528,19 +528,19 @@ impl<R> SecondaryGraphicsCommandBufferBuilder<R>
 
     /// Calls `vkCmdDraw`.
     // FIXME: push constants
-    pub fn draw<V, L, Pv, Pl, Rp>(self, pipeline: &Arc<GraphicsPipeline<Pv, Pl, Rp>>,
+    pub fn draw<V, L, Pv, Pl, Rp, Pc>(self, pipeline: &Arc<GraphicsPipeline<Pv, Pl, Rp>>,
-                              vertices: V, dynamic: &DynamicState, sets: L)
+                              vertices: V, dynamic: &DynamicState, sets: L, push_constants: &Pc)
                               -> SecondaryGraphicsCommandBufferBuilder<R>
         where Pv: VertexDefinition + VertexSource<V> + 'static, Pl: PipelineLayout + 'static + Send + Sync,
               Rp: RenderPass + 'static + Send + Sync, L: DescriptorSetsCollection + Send + Sync,
-              R: RenderPassCompatible<Rp>
+              R: RenderPassCompatible<Rp>, Pc: 'static + Clone
     {
         assert!(self.render_pass.is_compatible_with(pipeline.subpass().render_pass()));
         assert_eq!(self.render_pass_subpass, pipeline.subpass().index());
 
         unsafe {
             SecondaryGraphicsCommandBufferBuilder {
-                inner: self.inner.draw(pipeline, vertices, dynamic, sets),
+                inner: self.inner.draw(pipeline, vertices, dynamic, sets, push_constants),
                 render_pass: self.render_pass,
                 render_pass_subpass: self.render_pass_subpass,
                 framebuffer: self.framebuffer,
@@ -549,20 +549,20 @@ impl<R> SecondaryGraphicsCommandBufferBuilder<R>
     }
 
     /// Calls `vkCmdDrawIndexed`.
-    pub fn draw_indexed<'a, V, L, Pv, Pl, Rp, I, Ib, Ibb>(self, pipeline: &Arc<GraphicsPipeline<Pv, Pl, Rp>>,
+    pub fn draw_indexed<'a, V, L, Pv, Pl, Rp, I, Ib, Ibb, Pc>(self, pipeline: &Arc<GraphicsPipeline<Pv, Pl, Rp>>,
                                               vertices: V, indices: Ib, dynamic: &DynamicState,
-                                              sets: L) -> SecondaryGraphicsCommandBufferBuilder<R>
+                                              sets: L, push_constants: &Pc) -> SecondaryGraphicsCommandBufferBuilder<R>
         where Pv: 'static + VertexDefinition + VertexSource<V>, Pl: 'static + PipelineLayout + Send + Sync,
               Rp: RenderPass + 'static + Send + Sync,
               Ib: Into<BufferSlice<'a, [I], Ibb>>, I: 'static + Index, Ibb: Buffer + 'static,
-              L: DescriptorSetsCollection + Send + Sync
+              L: DescriptorSetsCollection + Send + Sync, Pc: 'static + Clone
     {
         assert!(self.render_pass.is_compatible_with(pipeline.subpass().render_pass()));
         assert_eq!(self.render_pass_subpass, pipeline.subpass().index());
 
         unsafe {
             SecondaryGraphicsCommandBufferBuilder {
-                inner: self.inner.draw_indexed(pipeline, vertices, indices, dynamic, sets),
+                inner: self.inner.draw_indexed(pipeline, vertices, indices, dynamic, sets, push_constants),
                 render_pass: self.render_pass,
                 render_pass_subpass: self.render_pass_subpass,
                 framebuffer: self.framebuffer,

vulkano/src/descriptor/descriptor.rs

@@ -314,7 +314,7 @@ impl DescriptorType {
 }
 
 /// Describes which shader stages have access to a descriptor.
-#[derive(Debug, Copy, Clone)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
 pub struct ShaderStages {
     /// `True` means that the descriptor will be used by the vertex shader.
     pub vertex: bool,
@@ -344,6 +344,19 @@ impl ShaderStages {
         }
     }
 
+    /// Creates a `ShaderStages` struct will all stages set to `false`.
+    #[inline]
+    pub fn none() -> ShaderStages {
+        ShaderStages {
+            vertex: false,
+            tessellation_control: false,
+            tessellation_evaluation: false,
+            geometry: false,
+            fragment: false,
+            compute: false,
+        }
+    }
+
     /// Creates a `ShaderStages` struct will all graphics stages set to `true`.
     #[inline]
     pub fn all_graphics() -> ShaderStages {

vulkano/src/descriptor/pipeline_layout/custom_pipeline_macro.rs

@@ -21,16 +21,23 @@ use sampler::Sampler;
 // TODO: more docs
 #[macro_export]
 macro_rules! pipeline_layout {
-    ($($name:ident: { $($field:ident: $ty:ty),* }),*) => {
+    (push_constants: { $($pc_f:ident: $pc_t:ty),* } $(, $name:ident: { $($field:ident: $ty:ty),* })*) => {
+        use std::mem;
         use std::sync::Arc;
         use std::vec::IntoIter as VecIntoIter;
         use $crate::OomError;
         use $crate::device::Device;
         use $crate::descriptor::descriptor::DescriptorDesc;
+        use $crate::descriptor::descriptor::ShaderStages;
         use $crate::descriptor::pipeline_layout::PipelineLayout;
         use $crate::descriptor::pipeline_layout::PipelineLayoutDesc;
         use $crate::descriptor::pipeline_layout::UnsafePipelineLayout;
 
+        #[derive(Debug, Copy, Clone)]
+        pub struct PushConstants {
+            $(pub $pc_f: $pc_t,)*
+        }
+
         pub struct CustomPipeline {
             inner: UnsafePipelineLayout
         }
@@ -44,8 +51,14 @@ macro_rules! pipeline_layout {
                     ),*
                 ];
 
+                let push_constants = if mem::size_of::<PushConstants>() >= 1 {
+                    Some((0, mem::size_of::<PushConstants>(), ShaderStages::all()))
+                } else {
+                    None
+                };
+
                 let inner = unsafe {
-                    try!(UnsafePipelineLayout::new(device, layouts.iter()))
+                    try!(UnsafePipelineLayout::new(device, layouts.iter(), push_constants))
                 };
 
                 Ok(Arc::new(CustomPipeline {
@@ -85,6 +98,10 @@ macro_rules! pipeline_layout {
         pipeline_layout!{__inner__ (0) $($name: {$($field: $ty),*})*}
     };
 
+    ($($name:ident: { $($field:ident: $ty:ty),* }),*) => {
+        pipeline_layout!{ push_constants: {} $(, $name: {$($field: $ty),*})* }
+    };
+
     (__inner__ ($num:expr) $name:ident: { $($field:ident: $ty:ty),* } $($rest:tt)*) => {
         pub mod $name {
             #![allow(unused_imports)]

vulkano/src/descriptor/pipeline_layout/sys.rs

@@ -18,6 +18,7 @@ use VulkanObject;
 use VulkanPointers;
 use vk;
 
+use descriptor::descriptor::ShaderStages;
 use descriptor::descriptor_set::UnsafeDescriptorSetLayout;
 use device::Device;
 
@@ -33,16 +34,19 @@ impl UnsafePipelineLayout {
     /// Creates a new `UnsafePipelineLayout`.
     // TODO: is this function unsafe?
     #[inline]
-    pub unsafe fn new<'a, I>(device: &Arc<Device>, layouts: I)
+    pub unsafe fn new<'a, I, P>(device: &Arc<Device>, layouts: I, push_constants: P)
-                             -> Result<UnsafePipelineLayout, OomError>
+                                -> Result<UnsafePipelineLayout, OomError>
-        where I: IntoIterator<Item = &'a Arc<UnsafeDescriptorSetLayout>>
+        where I: IntoIterator<Item = &'a Arc<UnsafeDescriptorSetLayout>>,
+              P: IntoIterator<Item = (usize, usize, ShaderStages)>,
     {
-        UnsafePipelineLayout::new_inner(device, layouts.into_iter().map(|e| e.clone()).collect())
+        UnsafePipelineLayout::new_inner(device, layouts.into_iter().map(|e| e.clone()).collect(),
+                                        push_constants.into_iter().collect())
     }
 
     // TODO: is this function unsafe?
     unsafe fn new_inner(device: &Arc<Device>,
-                        layouts: SmallVec<[Arc<UnsafeDescriptorSetLayout>; 16]>)
+                        layouts: SmallVec<[Arc<UnsafeDescriptorSetLayout>; 16]>,
+                        push_constants: SmallVec<[(usize, usize, ShaderStages); 8]>)
                         -> Result<UnsafePipelineLayout, OomError>
     {
         let vk = device.pointers();
@@ -51,6 +55,21 @@ impl UnsafePipelineLayout {
         let layouts_ids = layouts.iter().map(|l| l.internal_object())
                                  .collect::<SmallVec<[_; 16]>>();
 
+        let push_constants = push_constants.iter().map(|pc| {
+            // TODO: error
+            assert!(pc.2 != ShaderStages::none());
+            assert!(pc.1 > 0);
+            assert!((pc.1 % 4) == 0);
+            assert!(pc.0 + pc.1 <=
+                    device.physical_device().limits().max_push_constants_size() as usize);
+
+            vk::PushConstantRange {
+                stageFlags: pc.2.into(),
+                offset: pc.0 as u32,
+                size: pc.1 as u32,
+            }
+        }).collect::<SmallVec<[_; 8]>>();
+
         let layout = {
             let infos = vk::PipelineLayoutCreateInfo {
                 sType: vk::STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO,
@@ -58,8 +77,8 @@ impl UnsafePipelineLayout {
                 flags: 0,   // reserved
                 setLayoutCount: layouts_ids.len() as u32,
                 pSetLayouts: layouts_ids.as_ptr(),
-                pushConstantRangeCount: 0,      // TODO: unimplemented
+                pushConstantRangeCount: push_constants.len() as u32,
-                pPushConstantRanges: ptr::null(),    // TODO: unimplemented
+                pPushConstantRanges: push_constants.as_ptr(),
             };
 
             let mut output = mem::uninitialized();