WebGLRenderingContext.checkFramebufferStatus() - Web APIs 编辑

The WebGLRenderingContext.checkFramebufferStatus() method of the WebGL API returns the completeness status of the WebGLFramebuffer object.

Syntax

GLenum gl.checkFramebufferStatus(target);

Parameters

target

A GLenum specifying the binding point (target). Possible values:

• gl.FRAMEBUFFER: Collection buffer data storage of color, alpha, depth and stencil buffers used to render an image.
• When using a WebGL 2 context, the following values are available additionally:
  • gl.DRAW_FRAMEBUFFER: Equivalent to gl.FRAMEBUFFER. Used as a destination for drawing, rendering, clearing, and writing operations.
  • gl.READ_FRAMEBUFFER: Used as a source for reading operations.

Return value

A GLenum indicating the completeness status of the framebuffer or 0 if an error occurs. Possible enum return values:

• gl.FRAMEBUFFER_COMPLETE: The framebuffer is ready to display.
• gl.FRAMEBUFFER_INCOMPLETE_ATTACHMENT: The attachment types are mismatched or not all framebuffer attachment points are framebuffer attachment complete.
• gl.FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: There is no attachment.
• gl.FRAMEBUFFER_INCOMPLETE_DIMENSIONS: Height and width of the attachment are not the same.
• gl.FRAMEBUFFER_UNSUPPORTED: The format of the attachment is not supported or if depth and stencil attachments are not the same renderbuffer.
• When using a WebGL 2 context, the following values can be returned additionally:
  • gl.FRAMEBUFFER_INCOMPLETE_MULTISAMPLE: The values of gl.RENDERBUFFER_SAMPLES are different among attached renderbuffers, or are non-zero if the attached images are a mix of renderbuffers and textures.
• When using the OVR_multiview2 extension, the following value can be returned additionally:
  • ext.FRAMEBUFFER_INCOMPLETE_VIEW_TARGETS_OVR: If baseViewIndex is not the same for all framebuffer attachment points where the value of FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE is not NONE, the framebuffer is considered incomplete.

Examples

var canvas = document.getElementById('canvas');
var gl = canvas.getContext('webgl');
var framebuffer = gl.createFramebuffer();

// ...

gl.checkFramebufferStatus(gl.FRAMEBUFFER);

Specifications

Browser compatibility

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See also

• WebGLRenderingContext.createFramebuffer()
• WebGLRenderingContext.deleteFramebuffer()
• WebGLRenderingContext.isFramebuffer()
• Other buffers: WebGLBuffer, WebGLRenderbuffer