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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/API/WebGLRenderingContext/attachShader below:

WebGLRenderingContext: attachShader() method - Web APIs

WebGLRenderingContext: attachShader() method

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The WebGLRenderingContext.attachShader() method of the WebGL API attaches either a fragment or vertex WebGLShader to a WebGLProgram.

Syntax
attachShader(program, shader)
Parameters Return value

None (undefined).

Examples

The following code attaches pre-existing shaders to a WebGLProgram.

const program = gl.createProgram();

// Attach pre-existing shaders
gl.attachShader(program, vertexShader);
gl.attachShader(program, fragmentShader);

gl.linkProgram(program);

if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
  const info = gl.getProgramInfoLog(program);
  throw new Error(`Could not compile WebGL program. \n\n${info}`);
}
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