pub struct UniformBuffer<T>where
    T: Content + ?Sized,{ /* private fields */ }
Expand description

Buffer that contains a uniform block.

For example, to use a UniformBuffer<[u32; 8]>, you must declare it in GLSL as

     uniform MyBlock {
         uint array[8];
     };

and pass it to uniform! like this: # use glium::uniform; uniform! { MyBlock: &buffer, }

Implementations§

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impl<T> UniformBuffer<T>where T: Copy,

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pub fn new<F>( facade: &F, data: T ) -> Result<UniformBuffer<T>, BufferCreationError>where F: Facade + ?Sized,

Uploads data in the uniforms buffer.

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pub fn dynamic<F>( facade: &F, data: T ) -> Result<UniformBuffer<T>, BufferCreationError>where F: Facade + ?Sized,

Uploads data in the uniforms buffer.

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pub fn persistent<F>( facade: &F, data: T ) -> Result<UniformBuffer<T>, BufferCreationError>where F: Facade + ?Sized,

Uploads data in the uniforms buffer.

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pub fn immutable<F>( facade: &F, data: T ) -> Result<UniformBuffer<T>, BufferCreationError>where F: Facade + ?Sized,

Uploads data in the uniforms buffer.

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pub fn empty<F>(facade: &F) -> Result<UniformBuffer<T>, BufferCreationError>where F: Facade + ?Sized,

Creates an empty buffer.

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pub fn empty_dynamic<F>( facade: &F ) -> Result<UniformBuffer<T>, BufferCreationError>where F: Facade + ?Sized,

Creates an empty buffer.

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pub fn empty_persistent<F>( facade: &F ) -> Result<UniformBuffer<T>, BufferCreationError>where F: Facade + ?Sized,

Creates an empty buffer.

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pub fn empty_immutable<F>( facade: &F ) -> Result<UniformBuffer<T>, BufferCreationError>where F: Facade + ?Sized,

Creates an empty buffer.

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impl<T> UniformBuffer<T>where T: Content + ?Sized,

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pub fn empty_unsized<F>( facade: &F, size: usize ) -> Result<UniformBuffer<T>, BufferCreationError>where F: Facade + ?Sized,

Creates an empty buffer.

Panic

Panics if the size passed as parameter is not suitable for the type of data.

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pub fn empty_unsized_dynamic<F>( facade: &F, size: usize ) -> Result<UniformBuffer<T>, BufferCreationError>where F: Facade + ?Sized,

Creates an empty buffer.

Panic

Panics if the size passed as parameter is not suitable for the type of data.

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pub fn empty_unsized_persistent<F>( facade: &F, size: usize ) -> Result<UniformBuffer<T>, BufferCreationError>where F: Facade + ?Sized,

Creates an empty buffer.

Panic

Panics if the size passed as parameter is not suitable for the type of data.

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pub fn empty_unsized_immutable<F>( facade: &F, size: usize ) -> Result<UniformBuffer<T>, BufferCreationError>where F: Facade + ?Sized,

Creates an empty buffer.

Panic

Panics if the size passed as parameter is not suitable for the type of data.

Methods from Deref<Target = Buffer<T>>§

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

Returns the context corresponding to this buffer.

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pub fn get_size(&self) -> usize

Returns the size in bytes of this buffer.

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pub fn is_persistent(&self) -> bool

Returns true if this buffer uses persistent mapping.

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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.

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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.

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

Reads the content of the buffer.

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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.
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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.
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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.
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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.

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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)) };
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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.

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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.

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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.

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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.

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pub fn len(&self) -> usize

Returns the number of elements in this buffer.

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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.

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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.

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

Reads the content of the buffer.

Trait Implementations§

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

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fn as_uniform_value(&self) -> UniformValue<'_>

Builds a UniformValue.
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impl<T> Debug for UniformBuffer<T>where T: Content + Debug + ?Sized,

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<T> Deref for UniformBuffer<T>where T: Content + ?Sized,

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type Target = Buffer<T>

The resulting type after dereferencing.
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fn deref(&self) -> &Buffer<T>

Dereferences the value.
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impl<T> DerefMut for UniformBuffer<T>where T: Content + ?Sized,

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

Mutably dereferences the value.
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impl<'a, T> From<&'a UniformBuffer<T>> for BufferSlice<'a, T>where T: Content + ?Sized,

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

Converts to this type from the input type.
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impl<'a, T> From<&'a mut UniformBuffer<T>> for BufferMutSlice<'a, T>where T: Content + ?Sized,

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

Converts to this type from the input type.
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impl<T: ?Sized + Content> GlObject for UniformBuffer<T>

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type Id = u32

The type of identifier for this object.
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fn get_id(&self) -> c_uint

Returns the id of the object.

Auto Trait Implementations§

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impl<T> !RefUnwindSafe for UniformBuffer<T>

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impl<T> !Send for UniformBuffer<T>

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impl<T> !Sync for UniformBuffer<T>

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impl<T: ?Sized> Unpin for UniformBuffer<T>where T: Unpin,

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impl<T> !UnwindSafe for UniformBuffer<T>

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.