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<title>WebGL buffer deletion behavior test.</title>
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<script>
"use strict";
description("Test buffer deletion behavior.");
// This is a regression test for https://crbug.com/822976

var wtu = WebGLTestUtils;

var gl = wtu.create3DContext(undefined, undefined, 2);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors from setup.");

function runTexImageTest(gl) {
  debug("");
  var buffer = gl.createBuffer();
  gl.bindBuffer(gl.PIXEL_UNPACK_BUFFER, buffer);
  gl.bufferData(gl.PIXEL_UNPACK_BUFFER, 4, gl.DYNAMIC_DRAW);
  gl.bindBufferBase(gl.UNIFORM_BUFFER, 0, buffer);
  gl.deleteBuffer(buffer);
  // Indexed uniform buffer bindings should not prevent a buffer from being
  // deleted. Therefore, PIXEL_UNPACK_BUFFER binding should also be 0.
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "no error");

  var tex = gl.createTexture();
  gl.bindTexture(gl.TEXTURE_2D, tex);
  var data = new Uint8Array(1024);
  gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, 16, 16, 0,
                gl.RGBA, gl.UNSIGNED_BYTE, data);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "texImage2D should succeed");

  // Clean up bindings just in case an implementation gets it wrong.
  gl.bindBuffer(gl.PIXEL_UNPACK_BUFFER, null);
  gl.bindBufferBase(gl.UNIFORM_BUFFER, 0, null);
}

function runReadPixelsTest(gl) {
  debug("");
  var buffer = gl.createBuffer();
  gl.bindBuffer(gl.PIXEL_PACK_BUFFER, buffer);
  gl.bufferData(gl.PIXEL_PACK_BUFFER, 4, gl.DYNAMIC_DRAW);
  gl.bindBufferBase(gl.UNIFORM_BUFFER, 0, buffer);
  gl.deleteBuffer(buffer);
  // Indexed transform feedback buffer bindings should not prevent a buffer
  // from being deleted. Therefore, PIXEL_PACK_BUFFER binding should also be 0.
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "no error");

  var buffer = new Uint8Array(1024);
  gl.readPixels(0, 0, 16, 16, gl.RGBA, gl.UNSIGNED_BYTE, buffer);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "readPixels should succeed");

  // Clean up bindings just in case an implementation gets it wrong.
  gl.bindBuffer(gl.PIXEL_PACK_BUFFER, null);
  gl.bindBufferBase(gl.UNIFORM_BUFFER, 0, null);
}

runTexImageTest(gl);
runReadPixelsTest(gl);

debug("");
var successfullyParsed = true;
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