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WebGL2RenderingContext: beginTransformFeedback() method

files/en-us/web/api/webgl2renderingcontext/begintransformfeedback/index.md

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{{APIRef("WebGL")}}{{AvailableInWorkers}}

The WebGL2RenderingContext.beginTransformFeedback() method of the WebGL 2 API starts a transform feedback operation.

Syntax

js-nolint
beginTransformFeedback(primitiveMode)

Parameters

  • primitiveMode
    • : A {{domxref("WebGL_API/Types", "GLenum")}} specifying the output type of the primitives that will be recorded into the buffer objects that are bound for transform feedback. Possible values:
      • gl.POINTS
      • gl.LINES
      • gl.TRIANGLES

Return value

None ({{jsxref("undefined")}}).

Examples

js
const transformFeedback = gl.createTransformFeedback();
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, transformFeedback);
gl.beginTransformFeedback(gl.TRIANGLES);
gl.drawArrays(gl.TRIANGLES, 0, 3);

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

  • {{domxref("WebGLTransformFeedback")}}