WebGLRenderingContext.getRenderbufferParameter() - Web APIs 编辑

The WebGLRenderingContext.getRenderbufferParameter() method of the WebGL API returns information about the renderbuffer.

Syntax

any gl.getRenderbufferParameter(target, pname);

Parameters

target

A Glenum specifying the target renderbuffer object. Possible values:

• gl.RENDERBUFFER: Buffer data storage for single images in a renderable internal format.

pname

A Glenum specifying the information to query. Possible values:

• gl.RENDERBUFFER_WIDTH: Returns a GLint indicating the width of the image of the currently bound renderbuffer.
• gl.RENDERBUFFER_HEIGHT: Returns a GLint indicating the height of the image of the currently bound renderbuffer.
• gl.RENDERBUFFER_INTERNAL_FORMAT: Returns a GLenum indicating the internal format of the currently bound renderbuffer. The default is gl.RGBA4. Possible return values:
  • gl.RGBA4: 4 red bits, 4 green bits, 4 blue bits 4 alpha bits.
  • gl.RGB565: 5 red bits, 6 green bits, 5 blue bits. 
  • gl.RGB5_A1: 5 red bits, 5 green bits, 5 blue bits, 1 alpha bit.
  • gl.DEPTH_COMPONENT16: 16 depth bits.
  • gl.STENCIL_INDEX8: 8 stencil bits.
• gl.RENDERBUFFER_GREEN_SIZE: Returns a GLint that is the resolution size (in bits) for the green color.
• gl.RENDERBUFFER_BLUE_SIZE: Returns a GLint that is the resolution size (in bits) for the blue color.
• gl.RENDERBUFFER_RED_SIZE: Returns a GLint that is the resolution size (in bits) for the red color.
• gl.RENDERBUFFER_ALPHA_SIZE: Returns a GLint that is the resolution size (in bits) for the alpha component.
• gl.RENDERBUFFER_DEPTH_SIZE: Returns a GLint that is the resolution size (in bits) for the depth component.
• gl.RENDERBUFFER_STENCIL_SIZE: Returns a GLint that is the resolution size (in bits) for the stencil component.
• When using a WebGL 2 context, the following value is available additionally:
  • gl.RENDERBUFFER_SAMPLES: Returns a GLint indicating the number of samples of the image of the currently bound renderbuffer.

Return value

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

Examples

gl.getRenderbufferParameter(gl.RENDERBUFFER, gl.RENDERBUFFER_WIDTH);

Specifications

Browser compatibility

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See also

• WebGLRenderingContext.bindRenderbuffer()
• WebGLRenderingContext.createRenderbuffer()
• WebGLRenderingContext.deleteRenderbuffer()
• WebGLRenderingContext.renderbufferStorage()
• Other buffers: WebGLBuffer, WebGLFramebuffer