Struct glium::index::DrawCommandsIndicesBuffer

pub struct DrawCommandsIndicesBuffer { /* fields omitted */ }

A buffer containing a list of draw commands.

Implementations

impl DrawCommandsIndicesBuffer

pub fn empty<F: ?Sized>(
    facade: &F,
    elements: usize
) -> Result<DrawCommandsIndicesBuffer, BufferCreationError> where
    F: Facade, 

Builds an empty buffer.

The parameter indicates the number of elements.

pub fn empty_dynamic<F: ?Sized>(
    facade: &F,
    elements: usize
) -> Result<DrawCommandsIndicesBuffer, BufferCreationError> where
    F: Facade, 

Builds an empty buffer.

The parameter indicates the number of elements.

pub fn empty_persistent<F: ?Sized>(
    facade: &F,
    elements: usize
) -> Result<DrawCommandsIndicesBuffer, BufferCreationError> where
    F: Facade, 

Builds an empty buffer.

The parameter indicates the number of elements.

pub fn empty_immutable<F: ?Sized>(
    facade: &F,
    elements: usize
) -> Result<DrawCommandsIndicesBuffer, BufferCreationError> where
    F: Facade, 

Builds an empty buffer.

The parameter indicates the number of elements.

pub fn with_index_buffer<'a, T>(
    &'a self,
    index_buffer: &'a IndexBuffer<T>
) -> IndicesSource<'a> where
    T: Index, 

Builds an indices source from this buffer and a primitives type. This indices source can be passed to the draw() function.

Methods from Deref<Target = Buffer<[DrawCommandIndices]>>

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

Returns the context corresponding to this buffer.

pub fn get_size(&self) -> usize

Returns the size in bytes of this buffer.

pub fn is_persistent(&self) -> bool

Returns true if this buffer uses persistent mapping.

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 buffer. The data becomes undefined.

You should call this if you only use parts of a buffer. For example if you want to use the first half of the buffer, you invalidate the whole buffer then write the first half.

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

Implementation

Calls glInvalidateBufferData if supported. Otherwise, calls glBufferData with a null pointer for data. If glBufferStorage has been used to create the buffer and glInvalidateBufferData is not supported, does nothing.

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

Reads the content of the buffer.

pub fn map(&mut self) -> Mapping<'_, T>

Maps the buffer in memory for both reading and writing.

Implementation

• For persistent-mapped buffers, waits until the data is no longer accessed by the GPU then returns a pointer to the existing mapping.
• For immutable buffers, creates a temporary buffer containing the data of the buffer and maps it. When the mapping object is destroyed, copies the content of the temporary buffer to the real buffer.
• For other types, calls glMapBuffer or glMapSubBuffer.

pub fn map_read(&mut self) -> ReadMapping<'_, T>

Maps the buffer in memory for reading.

Implementation

• For persistent-mapped buffers, waits until the data is no longer accessed by the GPU then returns a pointer to the existing mapping.
• For immutable buffers, creates a temporary buffer containing the data of the buffer and maps it.
• For other types, calls glMapBuffer or glMapSubBuffer.

pub fn map_write(&mut self) -> WriteMapping<'_, T>

Maps the buffer in memory for writing only.

Implementation

• For persistent-mapped buffers, waits until the data is no longer accessed by the GPU then returns a pointer to the existing mapping.
• For immutable buffers, creates a temporary buffer and maps it. When the mapping object is destroyed, copies the content of the temporary buffer to the real buffer.
• For other types, calls glMapBuffer or glMapSubBuffer.

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

Copies the content of the buffer to another buffer.

Panic

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

pub unsafe fn slice_custom<R>(&self, f: Field<R>) -> BufferSlice<'_, R> where
    R: Content, 

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(glium::field!(BufferContent, value2)) };

pub unsafe fn slice_custom_mut<R>(
    &mut self,
    f: Field<R>
) -> BufferMutSlice<'_, R> where
    R: Content, 

Same as slice_custom but returns a mutable slice.

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

pub fn as_slice(&self) -> BufferSlice<'_, T>

Builds a slice containing the whole subbuffer.

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

pub fn as_mut_slice(&mut self) -> BufferMutSlice<'_, T>

Builds a slice containing the whole subbuffer.

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

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

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.

pub fn len(&self) -> usize

Returns the number of elements in this buffer.

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

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

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

pub fn slice_mut<R: RangeArgument<usize>>(
    &mut self,
    range: R
) -> Option<BufferMutSlice<'_, [T]>>

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

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

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

Reads the content of the buffer.

Trait Implementations

impl Deref for DrawCommandsIndicesBuffer

type Target = Buffer<[DrawCommandIndices]>

The resulting type after dereferencing.

fn deref(&self) -> &Buffer<[DrawCommandIndices]>

Dereferences the value.

impl DerefMut for DrawCommandsIndicesBuffer

fn deref_mut(&mut self) -> &mut Buffer<[DrawCommandIndices]>

Mutably dereferences the value.

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

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

Performs the conversion.

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

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

Performs the conversion.