WebGLRenderingContext.getBufferParameter()

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WebGLRenderingContext.getBufferParameter() 方法在 WebGL API returns information about the buffer.

any gl.getBufferParameter(target, pname);

target


									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.
当使用 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


									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. This is either:
- gl.STATIC_DRAW ,
- gl.DYNAMIC_DRAW ,
- gl.STREAM_DRAW .
- 当使用 WebGL 2 context , the following values are available additionally:
  - gl.STATIC_READ ,
  - gl.DYNAMIC_READ,
  - gl.STREAM_READ ,
  - gl.STATIC_COPY ,
  - gl.DYNAMIC_COPY,
  - gl.STREAM_COPY .

Depends on the requested information (as specified with pname ). Either a GLint 或 GLenum .

gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_SIZE);

规范	状态	注释
WebGL 1.0 The definition of 'getBufferParameter' in that specification.	推荐	Initial definition for WebGL.
OpenGL ES 2.0 The definition of 'glGetBufferParameteriv' in that specification.	标准	Man page of the (similar) OpenGL ES 2 API.
WebGL 2.0 The definition of 'getBufferParameter' in that specification.	编者草案	Updated definition for WebGL.
OpenGL ES 3.0 The definition of 'glGetBufferParameter' in that specification.	标准	Man page of the (similar) OpenGL ES 3 API. Adds new `target` buffers: `gl.COPY_READ_BUFFER` , `gl.COPY_WRITE_BUFFER` , `gl.TRANSFORM_FEEDBACK_BUFFER` , `gl.UNIFORM_BUFFER` , `gl.PIXEL_PACK_BUFFER` , `gl.PIXEL_UNPACK_BUFFER` Adds new `usage` hints: `gl.STATIC_READ` , `gl.DYNAMIC_READ` , `gl.STREAM_READ` , `gl.STATIC_COPY` , `gl.DYNAMIC_COPY` , `gl.STREAM_COPY` .