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WebGLRenderingContext: getBufferParameter() method - Web APIs | MDN
getBufferParameter(target, pname)
target-
A GLenum specifying the target buffer object. Possible values:
gl.ARRAY_BUFFER-
Buffer containing vertex attributes, such as
vertex coordinates, texture coordinate data, or vertex color data.
gl.ELEMENT_ARRAY_BUFFER-
Buffer used for element indices.
When using a WebGL 2 context,
the following values are available additionally:
gl.COPY_READ_BUFFER-
Buffer for copying from one buffer object to another.
gl.COPY_WRITE_BUFFER-
Buffer for copying from one buffer object to another.
gl.TRANSFORM_FEEDBACK_BUFFER-
Buffer for transform feedback operations.
gl.UNIFORM_BUFFER-
Buffer used for storing uniform blocks.
gl.PIXEL_PACK_BUFFER-
Buffer used for pixel transfer operations.
gl.PIXEL_UNPACK_BUFFER-
Buffer used for pixel transfer operations.
pname-
A GLenum specifying information to query. Possible values:
gl.BUFFER_SIZE-
Returns a GLint indicating the size
of the buffer in bytes.
gl.BUFFER_USAGE-
Returns a GLenum indicating the
usage pattern of the buffer. One of the following:
gl.STATIC_DRAWgl.DYNAMIC_DRAWgl.STREAM_DRAW
When using a WebGL 2 context,
the following values are available additionally:
gl.STATIC_READgl.DYNAMIC_READgl.STREAM_READgl.STATIC_COPYgl.DYNAMIC_COPYgl.STREAM_COPY
Depends on the requested information (as specified with pname). Either a
GLint or a GLenum.
gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_SIZE);
