feat(render): draw passes

4 files changed, 389 insertions, 0 deletions

diff --git a/stockton-render/src/draw/builders/mod.rs b/stockton-render/src/draw/builders/mod.rs
new file mode 100644
index 0000000..002c09f
--- /dev/null
+++ b/stockton-render/src/draw/builders/mod.rs
@@ -0,0 +1,3 @@
+pub mod pipeline;
+pub mod renderpass;
+pub mod shader;
diff --git a/stockton-render/src/draw/builders/pipeline.rs b/stockton-render/src/draw/builders/pipeline.rs
new file mode 100644
index 0000000..cdd9736
--- /dev/null
+++ b/stockton-render/src/draw/builders/pipeline.rs
@@ -0,0 +1,276 @@
+use super::{renderpass::RenderpassSpec, shader::ShaderDesc};
+use crate::{draw::target::SwapchainProperties, error::EnvironmentError, types::*};
+
+use std::{mem::ManuallyDrop, ops::Range};
+
+use anyhow::{Context, Result};
+use hal::{
+    format::Format,
+    pso::{
+        AttributeDesc, BakedStates, BasePipeline, BlendDesc, BufferIndex, DepthStencilDesc,
+        ElemStride, Element, GraphicsPipelineDesc, InputAssemblerDesc, PipelineCreationFlags,
+        PrimitiveAssemblerDesc, Rasterizer, Rect, ShaderStageFlags, VertexBufferDesc,
+        VertexInputRate, Viewport,
+    },
+};
+use shaderc::Compiler;
+
+pub struct VertexBufferSpec {
+    pub attributes: Vec<Format>,
+    pub rate: VertexInputRate,
+}
+
+impl VertexBufferSpec {
+    pub fn as_attribute_desc(&self, binding: BufferIndex) -> Vec<AttributeDesc> {
+        let mut v = Vec::with_capacity(self.attributes.len());
+        let mut offset = 0;
+        for (idx, format) in self.attributes.iter().enumerate() {
+            v.push(AttributeDesc {
+                location: idx as u32,
+                binding,
+                element: Element {
+                    offset,
+                    format: *format,
+                },
+            });
+            offset += get_size(*format);
+        }
+
+        v
+    }
+    pub fn stride(&self) -> ElemStride {
+        self.attributes.iter().fold(0, |x, f| x + get_size(*f))
+    }
+}
+
+fn get_size(f: Format) -> u32 {
+    match f {
+        Format::Rgb32Sfloat => 4 * 3,
+        Format::R32Sint => 4,
+        Format::Rg32Sfloat => 4 * 2,
+        _ => unimplemented!("dont know size of format {:?}", f),
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct VertexPrimitiveAssemblerSpec {
+    buffers: Vec<VertexBufferDesc>,
+    attributes: Vec<AttributeDesc>,
+    input_assembler: InputAssemblerDesc,
+}
+
+impl VertexPrimitiveAssemblerSpec {
+    pub fn with_buffer(&mut self, bd: VertexBufferSpec) -> &mut Self {
+        let idx = self.buffers.len() as u32;
+        self.buffers.push(VertexBufferDesc {
+            binding: idx,
+            stride: bd.stride(),
+            rate: bd.rate,
+        });
+
+        self.attributes.extend(bd.as_attribute_desc(idx));
+
+        self
+    }
+
+    pub fn with_buffers(iad: InputAssemblerDesc, mut bds: Vec<VertexBufferSpec>) -> Self {
+        let mut this = VertexPrimitiveAssemblerSpec {
+            buffers: vec![],
+            attributes: vec![],
+            input_assembler: iad,
+        };
+
+        for bd in bds.drain(..) {
+            this.with_buffer(bd);
+        }
+
+        this
+    }
+}
+
+#[derive(Builder, Debug)]
+#[builder(public)]
+pub struct PipelineSpec {
+    rasterizer: Rasterizer,
+    depth_stencil: DepthStencilDesc,
+    blender: BlendDesc,
+    primitive_assembler: VertexPrimitiveAssemblerSpec,
+
+    shader_vertex: ShaderDesc,
+    #[builder(setter(strip_option))]
+    shader_fragment: Option<ShaderDesc>,
+    #[builder(setter(strip_option), default)]
+    shader_geom: Option<ShaderDesc>,
+    #[builder(setter(strip_option), default)]
+    shader_tesselation: Option<(ShaderDesc, ShaderDesc)>,
+
+    push_constants: Vec<(ShaderStageFlags, Range<u32>)>,
+
+    renderpass: RenderpassSpec,
+}
+
+impl PipelineSpec {
+    pub fn build<'b, T: Iterator<Item = &'b DescriptorSetLayoutT> + std::fmt::Debug>(
+        self,
+        device: &mut DeviceT,
+        extent: hal::image::Extent,
+        _swapchain_properties: &SwapchainProperties,
+        set_layouts: T,
+    ) -> Result<CompletePipeline> {
+        // Renderpass
+        let renderpass = self.renderpass.build_renderpass(device)?;
+
+        // Subpass
+        let subpass = hal::pass::Subpass {
+            index: 0,
+            main_pass: &renderpass,
+        };
+
+        let mut compiler = Compiler::new().ok_or(EnvironmentError::NoShaderC)?;
+        let (vs_module, fs_module, gm_module, ts_module) = {
+            (
+                self.shader_vertex.compile(&mut compiler, device)?,
+                self.shader_fragment
+                    .as_ref()
+                    .map(|x| x.compile(&mut compiler, device))
+                    .transpose()?,
+                self.shader_geom
+                    .as_ref()
+                    .map(|x| x.compile(&mut compiler, device))
+                    .transpose()?,
+                self.shader_tesselation
+                    .as_ref()
+                    .map::<Result<_>, _>(|(a, b)| {
+                        Ok((
+                            a.compile(&mut compiler, device)?,
+                            b.compile(&mut compiler, device)?,
+                        ))
+                    })
+                    .transpose()?,
+            )
+        };
+
+        // Safety: *_module is always populated when shader_* is, so this is safe
+        let (vs_entry, fs_entry, gm_entry, ts_entry) = (
+            self.shader_vertex.as_entry(&vs_module),
+            self.shader_fragment
+                .as_ref()
+                .map(|x| x.as_entry(fs_module.as_ref().unwrap())),
+            self.shader_geom
+                .as_ref()
+                .map(|x| x.as_entry(gm_module.as_ref().unwrap())),
+            self.shader_tesselation.as_ref().map(|(a, b)| {
+                (
+                    a.as_entry(&ts_module.as_ref().unwrap().0),
+                    b.as_entry(&ts_module.as_ref().unwrap().1),
+                )
+            }),
+        );
+
+        // Pipeline layout
+        let layout = unsafe {
+            device.create_pipeline_layout(set_layouts.into_iter(), self.push_constants.into_iter())
+        }
+        .context("Error creating pipeline layout")?;
+
+        // Baked states
+        let baked_states = BakedStates {
+            viewport: Some(Viewport {
+                rect: extent.rect(),
+                depth: (0.0..1.0),
+            }),
+            scissor: Some(extent.rect()),
+            blend_constants: None,
+            depth_bounds: None,
+        };
+
+        // Primitive assembler
+        let primitive_assembler = PrimitiveAssemblerDesc::Vertex {
+            buffers: self.primitive_assembler.buffers.as_slice(),
+            attributes: self.primitive_assembler.attributes.as_slice(),
+            input_assembler: self.primitive_assembler.input_assembler,
+            vertex: vs_entry,
+            tessellation: ts_entry,
+            geometry: gm_entry,
+        };
+
+        // Pipeline description
+        let pipeline_desc = GraphicsPipelineDesc {
+            label: Some("stockton"),
+            rasterizer: self.rasterizer,
+            fragment: fs_entry,
+            blender: self.blender,
+            depth_stencil: self.depth_stencil,
+            multisampling: None,
+            baked_states,
+            layout: &layout,
+            subpass,
+            flags: PipelineCreationFlags::empty(),
+            parent: BasePipeline::None,
+            primitive_assembler,
+        };
+
+        // Pipeline
+        let pipeline = unsafe { device.create_graphics_pipeline(&pipeline_desc, None) }
+            .context("Error creating graphics pipeline")?;
+
+        Ok(CompletePipeline {
+            renderpass: ManuallyDrop::new(renderpass),
+            pipeline_layout: ManuallyDrop::new(layout),
+            pipeline: ManuallyDrop::new(pipeline),
+            vs_module: ManuallyDrop::new(vs_module),
+            fs_module,
+            gm_module,
+            ts_module,
+            render_area: extent.rect(),
+        })
+    }
+}
+
+pub struct CompletePipeline {
+    /// Our main render pass
+    pub(crate) renderpass: ManuallyDrop<RenderPassT>,
+
+    /// The layout of our main graphics pipeline
+    pub(crate) pipeline_layout: ManuallyDrop<PipelineLayoutT>,
+
+    /// Our main graphics pipeline
+    pub(crate) pipeline: ManuallyDrop<GraphicsPipelineT>,
+
+    /// The vertex shader module
+    pub(crate) vs_module: ManuallyDrop<ShaderModuleT>,
+
+    /// The fragment shader module
+    pub(crate) fs_module: Option<ShaderModuleT>,
+    pub(crate) gm_module: Option<ShaderModuleT>,
+    pub(crate) ts_module: Option<(ShaderModuleT, ShaderModuleT)>,
+
+    pub(crate) render_area: Rect,
+}
+
+impl CompletePipeline {
+    /// Deactivate vulkan resources. Use before dropping
+    pub fn deactivate(mut self, device: &mut DeviceT) {
+        unsafe {
+            use core::ptr::read;
+
+            device.destroy_render_pass(ManuallyDrop::into_inner(read(&self.renderpass)));
+
+            device.destroy_shader_module(ManuallyDrop::into_inner(read(&self.vs_module)));
+            if let Some(x) = self.fs_module.take() {
+                device.destroy_shader_module(x)
+            }
+            if let Some(x) = self.gm_module.take() {
+                device.destroy_shader_module(x)
+            }
+            self.ts_module.take().map(|(a, b)| {
+                device.destroy_shader_module(a);
+                device.destroy_shader_module(b);
+            });
+
+            device.destroy_graphics_pipeline(ManuallyDrop::into_inner(read(&self.pipeline)));
+
+            device.destroy_pipeline_layout(ManuallyDrop::into_inner(read(&self.pipeline_layout)));
+        }
+    }
+}
diff --git a/stockton-render/src/draw/builders/renderpass.rs b/stockton-render/src/draw/builders/renderpass.rs
new file mode 100644
index 0000000..43f0eb2
--- /dev/null
+++ b/stockton-render/src/draw/builders/renderpass.rs
@@ -0,0 +1,75 @@
+use crate::types::*;
+
+use std::iter::{empty, once};
+
+use anyhow::Result;
+use hal::pass::{Attachment, AttachmentRef, SubpassDesc};
+
+#[derive(Debug, Clone)]
+pub struct RenderpassSpec {
+    pub colors: Vec<Attachment>,
+    pub depth: Option<Attachment>,
+    pub inputs: Vec<Attachment>,
+    pub resolves: Vec<Attachment>,
+    pub preserves: Vec<Attachment>,
+}
+
+impl RenderpassSpec {
+    pub fn build_renderpass(self, device: &mut DeviceT) -> Result<RenderPassT> {
+        let mut next_offset = 0;
+
+        let colors: Vec<AttachmentRef> = self
+            .colors
+            .iter()
+            .enumerate()
+            .map(|(i, a)| (next_offset + i, a.layouts.end))
+            .collect();
+        next_offset = colors.len();
+
+        let depth_stencil = self.depth.as_ref().map(|x| (next_offset, x.layouts.end));
+        if depth_stencil.is_some() {
+            next_offset += 1;
+        }
+
+        let inputs: Vec<AttachmentRef> = self
+            .inputs
+            .iter()
+            .enumerate()
+            .map(|(i, a)| (next_offset + i, a.layouts.end))
+            .collect();
+        next_offset += inputs.len();
+
+        let resolves: Vec<AttachmentRef> = self
+            .resolves
+            .iter()
+            .enumerate()
+            .map(|(i, a)| (next_offset + i, a.layouts.end))
+            .collect();
+        next_offset += resolves.len();
+
+        let preserves: Vec<usize> = self
+            .preserves
+            .iter()
+            .enumerate()
+            .map(|(i, _a)| next_offset + i)
+            .collect();
+
+        let sp_desc = SubpassDesc {
+            colors: colors.as_slice(),
+            depth_stencil: depth_stencil.as_ref(),
+            inputs: inputs.as_slice(),
+            resolves: resolves.as_slice(),
+            preserves: preserves.as_slice(),
+        };
+
+        let all_attachments = self
+            .colors
+            .into_iter()
+            .chain(self.depth.into_iter())
+            .chain(self.inputs.into_iter())
+            .chain(self.resolves.into_iter())
+            .chain(self.preserves.into_iter());
+
+        Ok(unsafe { device.create_render_pass(all_attachments, once(sp_desc), empty())? })
+    }
+}
diff --git a/stockton-render/src/draw/builders/shader.rs b/stockton-render/src/draw/builders/shader.rs
new file mode 100644
index 0000000..fde185d
--- /dev/null
+++ b/stockton-render/src/draw/builders/shader.rs
@@ -0,0 +1,35 @@
+use crate::types::*;
+
+use anyhow::{Context, Result};
+use hal::pso::Specialization;
+use shaderc::{Compiler, ShaderKind};
+
+#[derive(Debug, Clone)]
+pub struct ShaderDesc {
+    pub source: String,
+    pub entry: String,
+    pub kind: ShaderKind,
+}
+
+impl ShaderDesc {
+    pub fn compile(&self, compiler: &mut Compiler, device: &mut DeviceT) -> Result<ShaderModuleT> {
+        let artifact = compiler
+            .compile_into_spirv(&self.source, self.kind, "shader", &self.entry, None)
+            .context("Shader compilation failed")?;
+
+        // Make into shader module
+        Ok(unsafe {
+            device
+                .create_shader_module(artifact.as_binary())
+                .context("Shader module creation failed")?
+        })
+    }
+
+    pub fn as_entry<'a>(&'a self, module: &'a ShaderModuleT) -> EntryPoint<'a> {
+        EntryPoint {
+            entry: &self.entry,
+            module,
+            specialization: Specialization::default(),
+        }
+    }
+}