Struct glium::texture::pixel_buffer::PixelBuffer [−] [src]

pub struct PixelBuffer<T> where T: PixelValue {
    // some fields omitted
}

Buffer that stores the content of a texture.

The generic type represents the type of pixels that the buffer contains.

Methods

impl<T> PixelBuffer<T> where T: PixelValue
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fn new_empty<F>(facade: &F, capacity: usize) -> PixelBuffer<T> where F: Facade

Builds a new buffer with an uninitialized content.

fn read_as_texture_2d<S>(&self) -> Result<S, ReadError> where S: Texture2dDataSink<T>

Reads the content of the pixel buffer.

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

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

Returns the context corresponding to this buffer.

fn get_size(&self) -> usize

Returns the size in bytes of this buffer.

fn is_persistent(&self) -> bool

Returns true if this buffer uses persistent mapping.

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.

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.

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

Reads the content of the buffer.

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.

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.

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.

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.

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

unsafe fn slice_custom_mut<F, R: ?Sized>(&mut self, f: F) -> BufferMutSlice<R> where F: for<'r> FnOnce(&'r T) -> &'r R, 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.

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.

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.

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.

fn len(&self) -> usize

Returns the number of elements in this buffer.

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.

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.

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

Reads the content of the buffer.

Trait Implementations

impl<T> Deref for PixelBuffer<T> where T: PixelValue
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type Target = Buffer<[T]>

The resulting type after dereferencing

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

The method called to dereference a value

impl<T> DerefMut for PixelBuffer<T> where T: PixelValue
[src]

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

The method called to mutably dereference a value

impl<T> GlObject for PixelBuffer<T> where T: PixelValue
[src]

type Id = GLuint

The type of identifier for this object.

fn get_id(&self) -> GLuint

Returns the id of the object.