File: 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>