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
GLintspecifying the bounds of the source rectangle. dstX0, dstY0, dstX1, dstX1- A
GLintspecifying the bounds of the destination rectangle. mask- A
GLbitfieldspecifying a bitwise OR mask indicating which buffers are to be copied. Possible values:gl.COLOR_BUFFER_BITgl.DEPTH_BUFFER_BITgl.STENCIL_BUFFER_BIT
filter- A
GLenumspecifying the interpolation to be applied if the image is stretched. Possible values:gl.NEARESTgl.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.