LayoutTests/webgl/resources/webgl_test_files/conformance2/extensions/ovr_multiview2_single_view_operations.html - WebKit - Git at Google

 <!--
 Copyright (c) 2019 The Khronos Group Inc.
 Use of this source code is governed by an MIT-style license that can be
 found in the LICENSE.txt file.
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 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="utf-8">
 <title>WebGL OVR_multiview2 Conformance Tests</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>
 <script src="../../js/tests/ovr_multiview2_util.js"></script>
 </head>
 <body>
 <div id="description"></div>
 <div id="console"></div>
 <script>
 "use strict";

 let wtu = WebGLTestUtils;
 let gl = wtu.create3DContext(null, null, 2);
 let ext = null;

 function runSingleViewReadTest()
 {
     debug("");
     debug("Testing reading from a multiview framebuffer with num_views = 1");

     let width = 256;
     let height = 256;
     let depth = 2;  // always supported so no need to query MAX_VIEWS_OVR.

     let fb = gl.createFramebuffer();
     gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
     let colorTex = createTextureWithNearestFiltering(gl.TEXTURE_2D_ARRAY);
     gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, width, height, depth);
     ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 1);

     gl.viewport(0, 0, width, height);
     gl.clearColor(0.0, 1.0, 1.0, 1.0);
     gl.clear(gl.COLOR_BUFFER_BIT);
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from clear");

     let buf = new Uint8Array(width * height * 4);
     gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, buf);
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from readPixels");

     wtu.checkCanvasRect(gl, 0, 0, width, height, [0, 255, 255, 255], 'view 0 should be cyan');
     gl.getError();

     // Also test for the error case with two views
     ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 2);
     gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, buf);
     wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION, "should be an error to read from a framebuffer with two views");
 }

 function runSingleViewBlitTest()
 {
     debug("");
     debug("Testing blitting from a multiview framebuffer with num_views = 1");

     let width = 256;
     let height = 256;
     let depth = 2;  // always supported so no need to query MAX_VIEWS_OVR.

     let fb = gl.createFramebuffer();
     gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
     let colorTex = createTextureWithNearestFiltering(gl.TEXTURE_2D_ARRAY);
     gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, width, height, depth);
     ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 1);

     gl.viewport(0, 0, width, height);
     gl.clearColor(0.0, 1.0, 1.0, 1.0);
     gl.clear(gl.COLOR_BUFFER_BIT);
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from clear");

     gl.canvas.width = width;
     gl.canvas.height = height;
     gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, null);
     gl.clearColor(0.0, 0.0, 0.0, 0.0)
     gl.clear(gl.COLOR_BUFFER_BIT);
     gl.blitFramebuffer(0, 0, width, height, 0, 0, width, height, gl.COLOR_BUFFER_BIT, gl.NEAREST);
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from blitFramebuffer");

     gl.bindFramebuffer(gl.FRAMEBUFFER, null);
     wtu.checkCanvasRect(gl, 0, 0, width, height, [0, 255, 255, 255], 'view 0 blitted to the default framebuffer should be cyan');

     // Also test for the error case with multiview blit target
     gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, fb);
     gl.blitFramebuffer(0, 0, width, height, 0, 0, width, height, gl.COLOR_BUFFER_BIT, gl.NEAREST);
     wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION, "should be an error to blit to a multiview framebuffer even if it has just one view");

     // Also test for the error case with two views
     gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
     ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 2);
     gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, null);
     gl.blitFramebuffer(0, 0, width, height, 0, 0, width, height, gl.COLOR_BUFFER_BIT, gl.NEAREST);
     wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION, "should be an error to blit from a framebuffer with two views");
 }

 function runSingleViewCopyTexImage2DTest()
 {
     debug("");
     debug("Testing copyTexImage2D from a multiview framebuffer with num_views = 1");

     let width = 256;
     let height = 256;
     let depth = 2;  // always supported so no need to query MAX_VIEWS_OVR.

     let fb = gl.createFramebuffer();
     gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
     let colorTex = createTextureWithNearestFiltering(gl.TEXTURE_2D_ARRAY);
     gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, width, height, depth);
     ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 1);

     gl.viewport(0, 0, width, height);
     gl.clearColor(0.0, 1.0, 1.0, 1.0);
     gl.clear(gl.COLOR_BUFFER_BIT);
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from clear");

     let copyTargetTex = createTextureWithNearestFiltering(gl.TEXTURE_2D);
     gl.bindTexture(gl.TEXTURE_2D, copyTargetTex);
     gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, 0, 0, width, height, 0);
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from copyTexImage2D");

     let copyFb = gl.createFramebuffer();
     gl.bindFramebuffer(gl.FRAMEBUFFER, copyFb);
     gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, copyTargetTex, 0);
     wtu.checkCanvasRect(gl, 0, 0, width, height, [0, 255, 255, 255], 'copy of view 0 in the 2D texture should be cyan');

     // Also test for the error case with two views
     gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
     ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 2);
     gl.bindTexture(gl.TEXTURE_2D, copyTargetTex);
     gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, 0, 0, width, height, 0);
     wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION, "should be an error to copy from a framebuffer with two views");
 }

 function runSingleViewCopyTexSubImage2DTest()
 {
     debug("");
     debug("Testing copyTexSubImage2D from a multiview framebuffer with num_views = 1");

     let width = 256;
     let height = 256;
     let depth = 2;  // always supported so no need to query MAX_VIEWS_OVR.

     let fb = gl.createFramebuffer();
     gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
     let colorTex = createTextureWithNearestFiltering(gl.TEXTURE_2D_ARRAY);
     gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, width, height, depth);
     ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 1);

     gl.viewport(0, 0, width, height);
     gl.clearColor(0.0, 1.0, 1.0, 1.0);
     gl.clear(gl.COLOR_BUFFER_BIT);
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from clear");

     let copyTargetTex = createTextureWithNearestFiltering(gl.TEXTURE_2D);
     gl.bindTexture(gl.TEXTURE_2D, copyTargetTex);
     gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
     gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, 0, 0, width, height);
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from copyTexImage2D");

     let copyFb = gl.createFramebuffer();
     gl.bindFramebuffer(gl.FRAMEBUFFER, copyFb);
     gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, copyTargetTex, 0);
     wtu.checkCanvasRect(gl, 0, 0, width, height, [0, 255, 255, 255], 'copy of view 0 in the 2D texture should be cyan');

     // Also test for the error case with two views
     gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
     ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 2);
     gl.bindTexture(gl.TEXTURE_2D, copyTargetTex);
     gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, 0, 0, width, height);
     wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION, "should be an error to copy from a framebuffer with two views");
 }

 function runSingleViewCopyTexSubImage3DTest()
 {
     debug("");
     debug("Testing copyTexSubImage3D from a multiview framebuffer with num_views = 1");

     let width = 256;
     let height = 256;
     let depth = 2;  // always supported so no need to query MAX_VIEWS_OVR.

     let fb = gl.createFramebuffer();
     gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
     let colorTex = createTextureWithNearestFiltering(gl.TEXTURE_2D_ARRAY);
     gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, width, height, depth);
     ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 1);

     gl.viewport(0, 0, width, height);
     gl.clearColor(0.0, 1.0, 1.0, 1.0);
     gl.clear(gl.COLOR_BUFFER_BIT);
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from clear");

     let copyTargetTex = createTextureWithNearestFiltering(gl.TEXTURE_3D);
     gl.bindTexture(gl.TEXTURE_3D, copyTargetTex);
     gl.texImage3D(gl.TEXTURE_3D, 0, gl.RGBA8, width, height, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
     gl.copyTexSubImage3D(gl.TEXTURE_3D, 0, 0, 0, 0, 0, 0, width, height);
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from copyTexSubImage3D");

     let copyFb = gl.createFramebuffer();
     gl.bindFramebuffer(gl.FRAMEBUFFER, copyFb);
     gl.framebufferTextureLayer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, copyTargetTex, 0, 0);
     wtu.checkCanvasRect(gl, 0, 0, width, height, [0, 255, 255, 255], 'copy of view 0 in the 3D texture should be cyan');

     // Also test for the error case with two views
     gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
     ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 2);
     gl.bindTexture(gl.TEXTURE_3D, copyTargetTex);
     gl.copyTexSubImage3D(gl.TEXTURE_3D, 0, 0, 0, 0, 0, 0, width, height);
     wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION, "should be an error to copy from a framebuffer with two views");
 }

 description("This test verifies that framebuffers with only one view can be read from with OVR_multiview2 extension, if it is available.");

 debug("");

 if (!gl) {
   testFailed("WebGL context does not exist");
 } else {
   testPassed("WebGL context exists");

   if (!gl.getExtension("OVR_multiview2")) {
       testPassed("No OVR_multiview2 support -- this is legal");
   } else {
       testPassed("Successfully enabled OVR_multiview2 extension");
       ext = gl.getExtension('OVR_multiview2');

       runSingleViewReadTest();

       runSingleViewBlitTest();

       runSingleViewCopyTexImage2DTest();

       runSingleViewCopyTexSubImage2DTest();

       runSingleViewCopyTexSubImage3DTest();
   }
 }

 debug("");
 var successfullyParsed = true;
 </script>
 <script src="../../js/js-test-post.js"></script>

 </body>
 </html>
	<!--
	Copyright (c) 2019 The Khronos Group Inc.
	Use of this source code is governed by an MIT-style license that can be
	found in the LICENSE.txt file.
	-->

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>WebGL OVR_multiview2 Conformance Tests</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>
	<script src="../../js/tests/ovr_multiview2_util.js"></script>
	</head>
	<body>
	<div id="description"></div>
	<div id="console"></div>
	<script>
	"use strict";

	let wtu = WebGLTestUtils;
	let gl = wtu.create3DContext(null, null, 2);
	let ext = null;

	function runSingleViewReadTest()
	{
	debug("");
	debug("Testing reading from a multiview framebuffer with num_views = 1");

	let width = 256;
	let height = 256;
	let depth = 2; // always supported so no need to query MAX_VIEWS_OVR.

	let fb = gl.createFramebuffer();
	gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
	let colorTex = createTextureWithNearestFiltering(gl.TEXTURE_2D_ARRAY);
	gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, width, height, depth);
	ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 1);

	gl.viewport(0, 0, width, height);
	gl.clearColor(0.0, 1.0, 1.0, 1.0);
	gl.clear(gl.COLOR_BUFFER_BIT);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from clear");

	let buf = new Uint8Array(width * height * 4);
	gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, buf);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from readPixels");

	wtu.checkCanvasRect(gl, 0, 0, width, height, [0, 255, 255, 255], 'view 0 should be cyan');
	gl.getError();

	// Also test for the error case with two views
	ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 2);
	gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, buf);
	wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION, "should be an error to read from a framebuffer with two views");
	}

	function runSingleViewBlitTest()
	{
	debug("");
	debug("Testing blitting from a multiview framebuffer with num_views = 1");

	let width = 256;
	let height = 256;
	let depth = 2; // always supported so no need to query MAX_VIEWS_OVR.

	let fb = gl.createFramebuffer();
	gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
	let colorTex = createTextureWithNearestFiltering(gl.TEXTURE_2D_ARRAY);
	gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, width, height, depth);
	ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 1);

	gl.viewport(0, 0, width, height);
	gl.clearColor(0.0, 1.0, 1.0, 1.0);
	gl.clear(gl.COLOR_BUFFER_BIT);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from clear");

	gl.canvas.width = width;
	gl.canvas.height = height;
	gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, null);
	gl.clearColor(0.0, 0.0, 0.0, 0.0)
	gl.clear(gl.COLOR_BUFFER_BIT);
	gl.blitFramebuffer(0, 0, width, height, 0, 0, width, height, gl.COLOR_BUFFER_BIT, gl.NEAREST);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from blitFramebuffer");

	gl.bindFramebuffer(gl.FRAMEBUFFER, null);
	wtu.checkCanvasRect(gl, 0, 0, width, height, [0, 255, 255, 255], 'view 0 blitted to the default framebuffer should be cyan');

	// Also test for the error case with multiview blit target
	gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, fb);
	gl.blitFramebuffer(0, 0, width, height, 0, 0, width, height, gl.COLOR_BUFFER_BIT, gl.NEAREST);
	wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION, "should be an error to blit to a multiview framebuffer even if it has just one view");

	// Also test for the error case with two views
	gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
	ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 2);
	gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, null);
	gl.blitFramebuffer(0, 0, width, height, 0, 0, width, height, gl.COLOR_BUFFER_BIT, gl.NEAREST);
	wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION, "should be an error to blit from a framebuffer with two views");
	}

	function runSingleViewCopyTexImage2DTest()
	{
	debug("");
	debug("Testing copyTexImage2D from a multiview framebuffer with num_views = 1");

	let width = 256;
	let height = 256;
	let depth = 2; // always supported so no need to query MAX_VIEWS_OVR.

	let fb = gl.createFramebuffer();
	gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
	let colorTex = createTextureWithNearestFiltering(gl.TEXTURE_2D_ARRAY);
	gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, width, height, depth);
	ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 1);

	gl.viewport(0, 0, width, height);
	gl.clearColor(0.0, 1.0, 1.0, 1.0);
	gl.clear(gl.COLOR_BUFFER_BIT);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from clear");

	let copyTargetTex = createTextureWithNearestFiltering(gl.TEXTURE_2D);
	gl.bindTexture(gl.TEXTURE_2D, copyTargetTex);
	gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, 0, 0, width, height, 0);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from copyTexImage2D");

	let copyFb = gl.createFramebuffer();
	gl.bindFramebuffer(gl.FRAMEBUFFER, copyFb);
	gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, copyTargetTex, 0);
	wtu.checkCanvasRect(gl, 0, 0, width, height, [0, 255, 255, 255], 'copy of view 0 in the 2D texture should be cyan');

	// Also test for the error case with two views
	gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
	ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 2);
	gl.bindTexture(gl.TEXTURE_2D, copyTargetTex);
	gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, 0, 0, width, height, 0);
	wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION, "should be an error to copy from a framebuffer with two views");
	}

	function runSingleViewCopyTexSubImage2DTest()
	{
	debug("");
	debug("Testing copyTexSubImage2D from a multiview framebuffer with num_views = 1");

	let width = 256;
	let height = 256;
	let depth = 2; // always supported so no need to query MAX_VIEWS_OVR.

	let fb = gl.createFramebuffer();
	gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
	let colorTex = createTextureWithNearestFiltering(gl.TEXTURE_2D_ARRAY);
	gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, width, height, depth);
	ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 1);

	gl.viewport(0, 0, width, height);
	gl.clearColor(0.0, 1.0, 1.0, 1.0);
	gl.clear(gl.COLOR_BUFFER_BIT);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from clear");

	let copyTargetTex = createTextureWithNearestFiltering(gl.TEXTURE_2D);
	gl.bindTexture(gl.TEXTURE_2D, copyTargetTex);
	gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
	gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, 0, 0, width, height);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from copyTexImage2D");

	let copyFb = gl.createFramebuffer();
	gl.bindFramebuffer(gl.FRAMEBUFFER, copyFb);
	gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, copyTargetTex, 0);
	wtu.checkCanvasRect(gl, 0, 0, width, height, [0, 255, 255, 255], 'copy of view 0 in the 2D texture should be cyan');

	// Also test for the error case with two views
	gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
	ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 2);
	gl.bindTexture(gl.TEXTURE_2D, copyTargetTex);
	gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, 0, 0, width, height);
	wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION, "should be an error to copy from a framebuffer with two views");
	}

	function runSingleViewCopyTexSubImage3DTest()
	{
	debug("");
	debug("Testing copyTexSubImage3D from a multiview framebuffer with num_views = 1");

	let width = 256;
	let height = 256;
	let depth = 2; // always supported so no need to query MAX_VIEWS_OVR.

	let fb = gl.createFramebuffer();
	gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
	let colorTex = createTextureWithNearestFiltering(gl.TEXTURE_2D_ARRAY);
	gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, width, height, depth);
	ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 1);

	gl.viewport(0, 0, width, height);
	gl.clearColor(0.0, 1.0, 1.0, 1.0);
	gl.clear(gl.COLOR_BUFFER_BIT);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from clear");

	let copyTargetTex = createTextureWithNearestFiltering(gl.TEXTURE_3D);
	gl.bindTexture(gl.TEXTURE_3D, copyTargetTex);
	gl.texImage3D(gl.TEXTURE_3D, 0, gl.RGBA8, width, height, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
	gl.copyTexSubImage3D(gl.TEXTURE_3D, 0, 0, 0, 0, 0, 0, width, height);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from copyTexSubImage3D");

	let copyFb = gl.createFramebuffer();
	gl.bindFramebuffer(gl.FRAMEBUFFER, copyFb);
	gl.framebufferTextureLayer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, copyTargetTex, 0, 0);
	wtu.checkCanvasRect(gl, 0, 0, width, height, [0, 255, 255, 255], 'copy of view 0 in the 3D texture should be cyan');

	// Also test for the error case with two views
	gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
	ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 2);
	gl.bindTexture(gl.TEXTURE_3D, copyTargetTex);
	gl.copyTexSubImage3D(gl.TEXTURE_3D, 0, 0, 0, 0, 0, 0, width, height);
	wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION, "should be an error to copy from a framebuffer with two views");
	}

	description("This test verifies that framebuffers with only one view can be read from with OVR_multiview2 extension, if it is available.");

	debug("");

	if (!gl) {
	testFailed("WebGL context does not exist");
	} else {
	testPassed("WebGL context exists");

	if (!gl.getExtension("OVR_multiview2")) {
	testPassed("No OVR_multiview2 support -- this is legal");
	} else {
	testPassed("Successfully enabled OVR_multiview2 extension");
	ext = gl.getExtension('OVR_multiview2');

	runSingleViewReadTest();

	runSingleViewBlitTest();

	runSingleViewCopyTexImage2DTest();

	runSingleViewCopyTexSubImage2DTest();

	runSingleViewCopyTexSubImage3DTest();
	}
	}

	debug("");
	var successfullyParsed = true;
	</script>
	<script src="../../js/js-test-post.js"></script>

	</body>
	</html>