feat(skeleton): add memory pools

added stock memory pools behind a feature gate
refactored buffers to use them and to have better APIs.
moved some util code out of builders::pipeline
updated stockton-render for the changes
deactivation is a WIP
breaks UI drawing, fix WIP

1 files changed, 54 insertions, 0 deletions

diff --git a/stockton-skeleton/src/buffers/draw.rs b/stockton-skeleton/src/buffers/draw.rs
new file mode 100644
index 0000000..cd571e3
--- /dev/null
+++ b/stockton-skeleton/src/buffers/draw.rs
@@ -0,0 +1,54 @@
+//! A vertex and index buffer set for drawing
+
+use super::staged::StagedBuffer;
+use crate::{
+    context::RenderingContext,
+    mem::{MappableBlock, MemoryPool},
+};
+
+use anyhow::{Context, Result};
+use hal::buffer::Usage;
+use std::mem::ManuallyDrop;
+
+/// Initial size of vertex buffer. TODO: Way of overriding this
+pub const INITIAL_VERT_SIZE: u64 = 3 * 3000;
+
+/// Initial size of index buffer. TODO: Way of overriding this
+pub const INITIAL_INDEX_SIZE: u64 = 3000;
+
+/// A vertex and index buffer set for drawing
+pub struct DrawBuffers<'a, T: Sized, P: MemoryPool, SP: MemoryPool> {
+    pub vertex_buffer: ManuallyDrop<StagedBuffer<'a, T, P, SP>>,
+    pub index_buffer: ManuallyDrop<StagedBuffer<'a, (u16, u16, u16), P, SP>>,
+}
+
+impl<'a, T, P, SP> DrawBuffers<'a, T, P, SP>
+where
+    P: MemoryPool,
+    SP: MemoryPool,
+    SP::Block: MappableBlock,
+{
+    /// Create a new set of drawbuffers given a render context.
+    /// This will allocate memory from `P` and `SP`, and currently has a fixed size (WIP).
+    pub fn from_context(context: &mut RenderingContext) -> Result<Self> {
+        let vert = StagedBuffer::from_context(context, Usage::VERTEX, INITIAL_VERT_SIZE)
+            .context("Error creating vertex buffer")?;
+        let index = StagedBuffer::from_context(context, Usage::INDEX, INITIAL_INDEX_SIZE)
+            .context("Error creating index buffer")?;
+
+        Ok(DrawBuffers {
+            vertex_buffer: ManuallyDrop::new(vert),
+            index_buffer: ManuallyDrop::new(index),
+        })
+    }
+
+    /// Destroy all Vulkan objects. Should be called before dropping.
+    pub fn deactivate(self, context: &mut RenderingContext) {
+        unsafe {
+            use core::ptr::read;
+
+            ManuallyDrop::into_inner(read(&self.vertex_buffer)).deactivate(context);
+            ManuallyDrop::into_inner(read(&self.index_buffer)).deactivate(context);
+        }
+    }
+}