Struct nannou::ui::backend::glium::glium::buffer::BufferSlice

pub struct BufferSlice<'a, T> where
    T: Content + 'a + ?Sized,  { /* fields omitted */ }

Represents a sub-part of a buffer.

Methods

impl<'a, T> BufferSlice<'a, T> where
    T: Content + 'a + ?Sized, 

pub fn get_size(&self) -> usize

Returns the size in bytes of this slice.

pub fn get_context(&self) -> &Rc<Context>

Returns the context corresponding to this buffer.

pub fn write(&self, data: &T)

Uploads some data in this buffer.

Implementation

• For persistent-mapped buffers, waits untils the data is no longer used by the GPU then memcpies the data to the mapping.
• For immutable buffers, creates a temporary buffer that contains the data then calls glCopyBufferSubData to copy from the temporary buffer to the real one.
• For other types, calls glBufferSubData.

Panic

Panics if the length of data is different from the length of this buffer.

pub fn invalidate(&self)

Invalidates the content of the slice. The data becomes undefined.

This operation is a no-op if the backend doesn't support it and for persistent-mapped buffers.

Implementation

Calls glInvalidateBufferSubData if supported.

pub fn read(&self) -> Result<<T as Content>::Owned, ReadError>

Reads the content of the buffer.

pub fn copy_to<S>(&self, target: S) -> Result<(), CopyError> where
    S: Into<BufferSlice<'a, T>>, 

Copies the content of this slice to another slice.

Panic

Panics if T is unsized and the other buffer is too small.

pub unsafe fn slice_custom<F, R>(&self, f: F) -> BufferSlice<'a, R> where
    F: for<'r> FnOnce(&'r T) -> &'r R,
    R: Content + ?Sized, 

Builds a slice that contains an element from inside the buffer.

This method builds an object that represents a slice of the buffer. No actual operation OpenGL is performed.

Example

#[derive(Copy, Clone)]
struct BufferContent {
    value1: u16,
    value2: u16,
}
let slice = unsafe { buffer.slice_custom(|content| &content.value2) };

Safety

The object whose reference is passed to the closure is uninitialized. Therefore you must not access the content of the object.

You must return a reference to an element from the parameter. The closure must not panic.

pub fn as_slice_any(&self) -> BufferAnySlice<'a>

Builds a slice-any containing the whole subbuffer.

This method builds an object that represents a slice of the buffer. No actual operation OpenGL is performed.

impl<'a, T> BufferSlice<'a, [T]> where
    [T]: Content,
    [T]: 'a, 

pub fn len(&self) -> usize

Returns the number of elements in this slice.

pub fn slice<R>(&self, range: R) -> Option<BufferSlice<'a, [T]>> where
    R: RangeArgument<usize>, 

Builds a subslice of this slice. Returns None if out of range.

This method builds an object that represents a slice of the buffer. No actual operation OpenGL is performed.

impl<'a, T> BufferSlice<'a, [T]> where
    T: PixelValue + 'a, 

pub fn read_as_texture_1d<S>(&self) -> Result<S, ReadError> where
    S: Texture1dDataSink<T>, 

Reads the content of the buffer.

Trait Implementations

impl<'a, T> Copy for BufferSlice<'a, T> where
    T: Copy + Content + 'a + ?Sized, 

impl<'a, T> Clone for BufferSlice<'a, T> where
    T: Clone + Content + 'a + ?Sized, 

fn clone(&self) -> BufferSlice<'a, T>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a, T> From<VertexBufferSlice<'a, T>> for BufferSlice<'a, [T]> where
    T: Copy, 

fn from(b: VertexBufferSlice<'a, T>) -> BufferSlice<'a, [T]>

Performs the conversion.

impl<'a, T> From<&'a UniformBuffer<T>> for BufferSlice<'a, T> where
    T: Content + ?Sized, 

fn from(b: &'a UniformBuffer<T>) -> BufferSlice<'a, T>

Performs the conversion.

impl<'a, T> From<IndexBufferSlice<'a, T>> for BufferSlice<'a, [T]> where
    T: Index, 

fn from(b: IndexBufferSlice<'a, T>) -> BufferSlice<'a, [T]>

Performs the conversion.

impl<'a> From<&'a DrawCommandsIndicesBuffer> for BufferSlice<'a, [DrawCommandIndices]>

fn from(
    b: &'a DrawCommandsIndicesBuffer
) -> BufferSlice<'a, [DrawCommandIndices]>

Performs the conversion.

impl<'a, T> From<&'a IndexBuffer<T>> for BufferSlice<'a, [T]> where
    T: Index, 

fn from(b: &'a IndexBuffer<T>) -> BufferSlice<'a, [T]>

Performs the conversion.

impl<'a, T> From<&'a VertexBuffer<T>> for BufferSlice<'a, [T]> where
    T: Copy, 

fn from(b: &'a VertexBuffer<T>) -> BufferSlice<'a, [T]>

Performs the conversion.

impl<'a, T> From<BufferMutSlice<'a, T>> for BufferSlice<'a, T> where
    T: Content + 'a + ?Sized, 

fn from(s: BufferMutSlice<'a, T>) -> BufferSlice<'a, T>

Performs the conversion.

impl<'a, T> From<&'a Buffer<T>> for BufferSlice<'a, T> where
    T: Content + 'a + ?Sized, 

fn from(b: &'a Buffer<T>) -> BufferSlice<'a, T>

Performs the conversion.

impl<'a, T> From<&'a mut Buffer<T>> for BufferSlice<'a, T> where
    T: Content + 'a + ?Sized, 

fn from(b: &'a mut Buffer<T>) -> BufferSlice<'a, T>

Performs the conversion.

impl<'a> From<&'a DrawCommandsNoIndicesBuffer> for BufferSlice<'a, [DrawCommandNoIndices]>

fn from(
    b: &'a DrawCommandsNoIndicesBuffer
) -> BufferSlice<'a, [DrawCommandNoIndices]>

Performs the conversion.

impl<'a, T> Debug for BufferSlice<'a, T> where
    T: Content + ?Sized, 

fn fmt(&self, fmt: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.