test_read_pixels_no_format.html

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<!DOCTYPE html>

<html>

<head>

<meta charset=utf-8>

<script src='/tests/SimpleTest/SimpleTest.js'></script>

</head>

<body>

<pre id=e_out></pre>

<script>

ok = window.ok || function(e, s) {

  e_out.textContent += `\n${!e ? 'FAIL' : 'pass'}: ${s}`;

};

// -

const canvas = document.createElement('canvas')

document.documentElement.appendChild(canvas)

const gl = canvas.getContext('webgl2')

gl.bindBuffer(gl.PIXEL_PACK_BUFFER, gl.createBuffer())

gl.readPixels(0, 0, 0, 0, gl.getParameter(gl.IMPLEMENTATION_COLOR_READ_FORMAT), 0, 0);

const err = gl.getError();

ok(err == gl.INVALID_ENUM, `err: ${err}`);

ok(true, 'done');

</script>

</body>

</html>