compressed-tex-sub-image-2d-without-base-image.html

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This WPT test may be referenced by the following Test IDs:
- /webgl/compressed-tex-sub-image-2d-without-base-image.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>compressedTexSubImage2D without prior compressedTexImage2D generates INVALID_OPERATION</title>

<link rel=author title="Babalola Taiwo Joseph" href=mailto:t.babalolajoseph@gmail.com>

<link rel=help href=https://www.khronos.org/registry/webgl/specs/latest/#5.14.8>

<script src=/resources/testharness.js></script>

<script src=/resources/testharnessreport.js></script>

<div id=log></div>

<script>

test(function() {

  var canvas = document.createElement("canvas");

  var gl = canvas.getContext("webgl");

  assert_true(!!gl, "WebGL context should be available");

  var s3tc = gl.getExtension("WEBGL_compressed_texture_s3tc");

  var etc1 = gl.getExtension("WEBGL_compressed_texture_etc1");

  var format, dataSize;

  if (s3tc) {

    format = s3tc.COMPRESSED_RGB_S3TC_DXT1_EXT;

    dataSize = 8;

  } else if (etc1) {

    format = etc1.COMPRESSED_RGB_ETC1_WEBGL;

    dataSize = 8;

  assert_true(!!format, "A supported compressed texture format must be available");

  var texture = gl.createTexture();

  gl.bindTexture(gl.TEXTURE_2D, texture);

  gl.compressedTexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, 4, 4, format, new Uint8Array(dataSize));

  assert_equals(gl.getError(), gl.INVALID_OPERATION,

    "compressedTexSubImage2D without a prior compressedTexImage2D should generate INVALID_OPERATION");

}, "compressedTexSubImage2D without base image generates INVALID_OPERATION");

</script>