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# MVertexBuffer Class Reference
OpenMayaRender - API module for rendering

This reference page is linked to from the following overview topics: データ クラス(Data Classes).

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## Detailed Description

Vertex buffer for use with MGeometry.

This class represents a vertex buffer with attributes described by the descriptor member.

When retrieving a vertex buffer for binding to custom shaders (MPxShaderOverride), resourceHandle() may be called to get the device dependent handle to the vertex buffer on the GPU.

When creating a vertex buffer to supply geometric data to Maya (MPxGeometryOverride), acquire() may be called to get a pointer to a block of memory to fill with said data. Once filled, commit() must be called to apply the data to the buffer.

Examples:

  cgfxShaderNode.cpp, hwColorPerVertexShader.cpp, and hwPhongShader.cpp.

`#include <MHWGeometry.h>`

List of all members.

## Public Member Functions
| MVertexBuffer (const MVertexBufferDescriptor &descriptor)
| Constructor.
| ~MVertexBuffer ()
| Destructor.
const MVertexBufferDescriptor & | descriptor () const
| Get the the buffer descriptor.
void * | resourceHandle () const
| Gets a graphics device dependent handle to a vertex buffer.
void * | acquire (unsigned int size)
| Get a pointer to memory for the buffer.
void | commit (void *buffer)
| Commit the data stored in the memory given by acquire() to the buffer.
## Static Public Member Functions
static const char * | className ()
| Returns the name of this class.
## Friends
class | MGeometry Search for all occurrences

## Constructor & Destructor Documentation

MVertexBuffer | ( | const MVertexBufferDescriptor & | desc | ) |

Constructor.

Parameters:

  [in] | desc | A descriptor to define the vertex buffer attributes

~MVertexBuffer | ( |  | ) |

Destructor.

Note that it is an error to delete MVertexBuffer objects that are owned by or in use by an MGeometry object. Such actions may cause instability.

## Member Function Documentation

const MVertexBufferDescriptor & descriptor | ( |  | ) | const

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Get the the buffer descriptor.

Returns:
  The buffer descriptor

Examples:
  cgfxShaderNode.cpp, hwColorPerVertexShader.cpp, and hwPhongShader.cpp.

void * resourceHandle | ( |  | ) | const

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Gets a graphics device dependent handle to a vertex buffer.

For OpenGL the return value is a pointer to an OpenGL identifier (GLuint) to an vertex buffer containing the data. Buffers can be set via the OpenGL API for drawing purposes. (e.g. using glBindBuffer).

A NULL pointer will be returned if the graphics device dependent handle is not yet available.

If the pointer is not NULL, the value is only guaranteed to exist during the current draw. The value should never be cached or modified.

Returns:
  A pointer to device dependent vertex data

Examples:
  cgfxShaderNode.cpp, hwColorPerVertexShader.cpp, and hwPhongShader.cpp.

void * acquire | ( | unsigned int | size | ) |

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Get a pointer to memory for the buffer.

This method is meant to be used in MPxGeometryOverride::populateGeometry() in order to provide data to Maya for drawing the associated object. The size of the buffer returned will be (size * descriptor.dataTypeSize() * descriptor.dimension()) bytes. The memory for the buffer is managed internally.

Note that not all vertex buffer descriptors can be used to create vertex buffers as not all combinations of data types, dimensions and semantics are currently supported. If the descriptor for this buffer is not supported this method will return NULL.

Parameters:

  [in] | size | The size of the buffer to acquire.

Returns:
  A pointer to memory for the buffer, or NULL on failure

void commit | ( | void * | buffer | ) |

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Commit the data stored in the memory given by acquire() to the buffer.

If this method is not called, the acquired buffer will not be used in drawing. The pointer must be the same pointer returned from acquire().

Parameters:

  [in] | buffer | A pointer to the data.

const char * className | ( |  | ) | `[static]`

Search for all occurrences

Returns the name of this class.

Returns:
  The name of this class.

MVertexBuffer MVertexBuffer MVertexBuffer MVertexBuffer MVertexBuffer MVertexBuffer MVertexBuffer MVertexBuffer MVertexBuffer MVertexBuffer
MVertexBuffer MVertexBuffer MVertexBuffer MVertexBuffer MVertexBuffer MVertexBuffer MVertexBuffer MVertexBuffer MVertexBuffer MVertexBuffer