glBufferData lets you create and initialize the data store of a buffer object. If data is non-null, then the source data is copied to the buffer object�s data store. If data is null, then the contents of the buffer object�s data store are undefined.
The options for usage are:
GL_STATIC_DRAWWhere the data store contents will be specified once by the application, and used many times as the source for GL drawing commands.
GL_DYNAMIC_DRAWWhere the data store contents will be respecified repeatedly by the application, and used many times as the source for GL drawing commands.
glBufferData deletes any existing data store, and sets the values of the buffer object�s state variables thus:
GL_BUFFER_SIZE initialized to size.
GL_BUFFER_USAGE initialized to usage.
GL_BUFFER_ACCESS initialized to GL_WRITE_ONLY.
Clients must align data elements consistent with the requirements of the client platform, with an additional base-level requirement that an offset within a buffer to a datum comprising N basic machine units be a multiple of N.
usage is provided as a performance hint only. The specified usage value does not constrain the actual usage pattern of the data store.
GL_INVALID_ENUM is generated if target is not one of the allowable values.
GL_INVALID_ENUM is generated if usage is not one of the allowable values.
GL_OUT_OF_MEMORY is generated if the GL is unable to create a data store of the requested size.
@param target Specifies the buffer object target, which must beGL_ARRAY_BUFFER or GL_ELEMENT_ARRAY_BUFFER.
@param size Specifies the size of the data store in basic machineunits.
@param data Specifies the source data in client memory.
@param usage Specifies the expected application usage pattern ofthe data store. Accepted values are GL_STATIC_DRAW and GL_DYNAMIC_DRAW.
@exception IllegalArgumentException if data isnon-null but is not a direct buffer.
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