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use super::*; struct RawBuffer { ugli: Rc<Ugli>, handle: raw::Buffer, usage: raw::Enum, size: Cell<usize>, phantom_data: PhantomData<*mut ()>, } impl RawBuffer { fn new(ugli: &Rc<Ugli>, usage: raw::Enum) -> Self { let gl = &ugli.inner; Self { ugli: ugli.clone(), handle: gl.create_buffer().unwrap(), usage, size: Cell::new(0), phantom_data: PhantomData, } } fn bind(&self) { let gl = &self.ugli.inner; gl.bind_buffer(raw::ARRAY_BUFFER, &self.handle); self.ugli.debug_check(); } fn set_data<T>(&self, data: &Vec<T>) { let gl = &self.ugli.inner; self.bind(); let capacity = mem::size_of::<T>() * data.capacity(); if self.size.get() < capacity { self.size.set(capacity); gl.buffer_data( raw::ARRAY_BUFFER, unsafe { std::slice::from_raw_parts(data.as_ptr(), data.capacity()) }, self.usage, ); } else { gl.buffer_sub_data(raw::ARRAY_BUFFER, 0, data); } self.ugli.debug_check(); } } impl Drop for RawBuffer { fn drop(&mut self) { let gl = &self.ugli.inner; gl.delete_buffer(&self.handle); } } pub struct VertexBuffer<T: Vertex> { buffer: RawBuffer, data: Vec<T>, need_update: Cell<bool>, } impl<T: Vertex> Deref for VertexBuffer<T> { type Target = Vec<T>; fn deref(&self) -> &Vec<T> { &self.data } } impl<T: Vertex> DerefMut for VertexBuffer<T> { fn deref_mut(&mut self) -> &mut Vec<T> { self.need_update.set(true); &mut self.data } } impl<T: Vertex> VertexBuffer<T> { fn new(ugli: &Rc<Ugli>, data: Vec<T>, usage: raw::Enum) -> Self { let buffer = RawBuffer::new(ugli, usage); buffer.set_data(&data); Self { buffer, data, need_update: Cell::new(false), } } pub fn new_static(ugli: &Rc<Ugli>, data: Vec<T>) -> Self { Self::new(ugli, data, raw::STATIC_DRAW) } pub fn new_dynamic(ugli: &Rc<Ugli>, data: Vec<T>) -> Self { Self::new(ugli, data, raw::DYNAMIC_DRAW) } pub fn slice<R>(&self, range: R) -> VertexBufferSlice<T> where R: RangeBounds<usize>, { VertexBufferSlice { buffer: self, range: index_range(self.data.len(), range), } } pub(crate) fn bind(&self) { if self.need_update.get() { self.buffer.set_data(&self.data); self.need_update.set(false); } self.buffer.bind(); } } pub struct VertexBufferSlice<'a, T: Vertex + 'a> { pub(crate) buffer: &'a VertexBuffer<T>, pub(crate) range: Range<usize>, } impl<'a, T: Vertex + 'a> Deref for VertexBufferSlice<'a, T> { type Target = [T]; fn deref(&self) -> &Self::Target { &self.buffer.data[self.range.clone()] } } pub trait IntoVertexBufferSlice<'a, T: Vertex + 'a> { fn into_slice(self) -> VertexBufferSlice<'a, T>; } impl<'a, T: Vertex + 'a> IntoVertexBufferSlice<'a, T> for VertexBufferSlice<'a, T> { fn into_slice(self) -> VertexBufferSlice<'a, T> { self } } impl<'a, T: Vertex + 'a> IntoVertexBufferSlice<'a, T> for &'a VertexBufferSlice<'a, T> { fn into_slice(self) -> VertexBufferSlice<'a, T> { VertexBufferSlice { buffer: self.buffer, range: self.range.clone(), } } } impl<'a, T: Vertex + 'a> IntoVertexBufferSlice<'a, T> for &'a VertexBuffer<T> { fn into_slice(self) -> VertexBufferSlice<'a, T> { self.slice(..) } }