texture-copying-feedback-loops.html

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Copyright (c) 2019 The Khronos Group Inc.

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<head>

<meta charset="utf-8">

<title>WebGL Texture Copying Feedback Loops Test</title>

<link rel="stylesheet" href="../../../resources/js-test-style.css"/>

<script src="../../../js/js-test-pre.js"></script>

<script src="../../../js/webgl-test-utils.js"></script>

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<body>

<canvas id="example" width="1" height="1" style="width: 40px; height: 40px;"></canvas>

<div id="description"></div>

<div id="console"></div>

<script>

"use strict";

description("Checks that texture copying feedback loops fail correctly.");

var wtu = WebGLTestUtils;

var gl = wtu.create3DContext("example");

var texture = gl.createTexture();

gl.bindTexture(gl.TEXTURE_2D, texture);

gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 2, 2, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);

gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);

gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);

gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);

gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);

var texture2 = gl.createTexture();

gl.bindTexture(gl.TEXTURE_2D, texture2);

gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 2, 2, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);

gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);

gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);

gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);

gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);

var framebuffer = gl.createFramebuffer();

gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);

gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);

assertMsg(gl.checkFramebufferStatus(gl.FRAMEBUFFER) == gl.FRAMEBUFFER_COMPLETE,

    "framebuffer should be FRAMEBUFFER_COMPLETE.");

wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after setup");

debug("");

debug("testing copyTexImage2D");

gl.bindTexture(gl.TEXTURE_2D, texture);

gl.copyTexImage2D(gl.TEXTURE_2D, 1, gl.RGBA, 0, 0, 2, 2, 0);

wtu.glErrorShouldBe(gl, gl.NO_ERROR,

    "after copyTexImage2D to same texture but different level");

gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 0, 0, 2, 2, 0);

wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION,

    "after copyTexImage2D to same texture same level, invalid feedback loop");

gl.bindTexture(gl.TEXTURE_2D, texture2);

gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 0, 0, 2, 2, 0);

wtu.glErrorShouldBe(gl, gl.NO_ERROR,

    "after copyTexImage2D to different texture");

debug("");

debug("testing copyTexSubImage2D");

gl.bindTexture(gl.TEXTURE_2D, texture);

gl.copyTexSubImage2D(gl.TEXTURE_2D, 1, 0, 0, 0, 0, 1, 1);

wtu.glErrorShouldBe(gl, gl.NO_ERROR,

    "after copyTexSubImage2D to same texture but different level");

gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, 0, 0, 1, 1);

wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION,

    "after copyTexSubImage2D to same texture same level, invalid feedback loop");

gl.bindTexture(gl.TEXTURE_2D, texture2);

gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, 0, 0, 1, 1);

wtu.glErrorShouldBe(gl, gl.NO_ERROR,

    "after copyTexSubImage2D to different texture");

var successfullyParsed = true;

</script>

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