This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
The WebGL2RenderingContext.blitFramebuffer()
method of the WebGL 2 API transfers a block of pixels from the read framebuffer to the draw framebuffer.
Syntax
void gl.blitFramebuffer(srcX0, srcY0, srcX1, srcY1, dstX0, dstY0, dstX1, dstX1, mask, filter);
Parameters
srcX0, srcY0, srcX1, srcY1
- A
GLint
specifying the bounds of the source rectangle. dstX0, dstY0, dstX1, dstX1
- A
GLint
specifying the bounds of the destination rectangle. mask
- A
GLbitfield
specifying a bitwise OR mask indicating which buffers are to be copied. Possible values:gl.COLOR_BUFFER_BIT
gl.DEPTH_BUFFER_BIT
gl.STENCIL_BUFFER_BIT
filter
- A
GLenum
specifying the interpolation to be applied if the image is stretched. Possible values:gl.NEAREST
gl.LINEAR
Return value
None.
Examples
gl.blitFramebuffer(0, 0, canvas.width, canvas.height, 0, 0, canvas.width, canvas.height, gl.COLOR_BUFFER_BIT, gl.NEAREST);
Specifications
Specification | Status | Comment |
---|---|---|
WebGL 2.0 The definition of 'blitFramebuffer' in that specification. |
Editor's Draft | Initial definition for WebGL. |
OpenGL ES 3.0 The definition of 'glBlitFramebuffer' in that specification. |
Standard | Man page of the (similar) OpenGL API. |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | No support [2] | Nightly build [1] | No support | No support | No support |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | No support | No support | No support | No support | No support | No support |
[1] WebGL 2 is enabled by default in Firefox Nightly. To enable it in a release version of Firefox, set the preference webgl.enable-prototype-webgl2
to true
in about:config.
[2] To use an experimental implementation of WebGL 2 in Chrome, you have to start Chrome with the runtime flag --enable-unsafe-es3-apis
.