LayoutTests/webgl/2.0.0/resources/webgl_test_files/conformance/reading/fbo-remains-unchanged-after-read-pixels.html - WebKit - Git at Google

 <!--

 /*
 ** Copyright (c) 2017 The Khronos Group Inc.
 **
 ** Permission is hereby granted, free of charge, to any person obtaining a
 ** copy of this software and/or associated documentation files (the
 ** "Materials"), to deal in the Materials without restriction, including
 ** without limitation the rights to use, copy, modify, merge, publish,
 ** distribute, sublicense, and/or sell copies of the Materials, and to
 ** permit persons to whom the Materials are furnished to do so, subject to
 ** the following conditions:
 **
 ** The above copyright notice and this permission notice shall be included
 ** in all copies or substantial portions of the Materials.
 **
 ** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 ** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 ** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 ** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 ** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 ** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 ** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
 */

 -->

 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="utf-8">
 <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>
 </head>
 <body>
 <div id="description"></div>
 <div id="console"></div>
 <canvas id="canvas" width="4" height="4"></canvas>
 <script id="vshader" type="x-shader/x-vertex">
 attribute vec3 a_pos;
 attribute vec4 a_color;
 varying vec4 v_color;

 void main()
 {
     v_color = a_color;
     gl_Position = vec4(a_pos.xyz, 1.0);
 }
 </script>

 <script id="fshader" type="x-shader/x-fragment">
 precision mediump float;

 varying vec4 v_color;

 void main()
 {
     gl_FragColor = v_color;
 }
 </script>

 <script>
 "use strict";

 description("when antialias is enabled, verify default fbo pixels would not be changed between two readPixels without drawing operations");
 var wtu = WebGLTestUtils;
 var N = 4;

 var vertices = new Float32Array([
          1.0, 1.0, 0.0,
         -1.0, -1.0, 0.0]);
 var colors = new Uint8Array([
         255, 0, 0, 255,
         255, 0, 0, 255]);

 var canvas = document.getElementById('canvas');
 var gl = wtu.create3DContext(canvas, {antialias: true});

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

   var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["a_pos", "a_color"]);
   gl.clearColor(0, 0, 0, 1);
   gl.clear(gl.COLOR_BUFFER_BIT);

   var colorOffset = vertices.byteLength;
   var vbo = gl.createBuffer();
   gl.bindBuffer(gl.ARRAY_BUFFER, vbo);
   gl.bufferData(gl.ARRAY_BUFFER, colorOffset + colors.byteLength, gl.STATIC_DRAW);
   gl.bufferSubData(gl.ARRAY_BUFFER, 0, vertices);
   gl.bufferSubData(gl.ARRAY_BUFFER, colorOffset, colors);

   gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
   gl.enableVertexAttribArray(0);
   gl.vertexAttribPointer(1, 4, gl.UNSIGNED_BYTE, true, 0, colorOffset);
   gl.enableVertexAttribArray(1);
   gl.drawArrays(gl.LINES, 0, vertices.length / 3);

   var result_1 = new Uint8Array(N * N * 4);
   var result_2 = new Uint8Array(N * N * 4);
   gl.readPixels(0, 0, N, N, gl.RGBA, gl.UNSIGNED_BYTE, result_1);
   gl.readPixels(0, 0, N, N, gl.RGBA, gl.UNSIGNED_BYTE, result_2);

   var tolerance = 0;
   var diff = new Uint8Array(N * N * 4);
   var failed = wtu.comparePixels(result_1, result_2, tolerance, diff);

   if (failed) {
     testFailed("default fbo pixels had be changed between two readPixels without drawing operations");
   } else {
     testPassed("default fbo pixels had not be changed between two readPixels without drawing operations.");
   }

   gl.bindBuffer(gl.ARRAY_BUFFER, null);
   gl.deleteBuffer(vbo);
 }

 var successfullyParsed = true;
 </script>
 <script src="../../js/js-test-post.js"></script>
 </body>
 </html>
	<!--

	/*
	** Copyright (c) 2017 The Khronos Group Inc.
	**
	** Permission is hereby granted, free of charge, to any person obtaining a
	** copy of this software and/or associated documentation files (the
	** "Materials"), to deal in the Materials without restriction, including
	** without limitation the rights to use, copy, modify, merge, publish,
	** distribute, sublicense, and/or sell copies of the Materials, and to
	** permit persons to whom the Materials are furnished to do so, subject to
	** the following conditions:
	**
	** The above copyright notice and this permission notice shall be included
	** in all copies or substantial portions of the Materials.
	**
	** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
	** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
	** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
	** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
	** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
	*/

	-->

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<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>
	</head>
	<body>
	<div id="description"></div>
	<div id="console"></div>
	<canvas id="canvas" width="4" height="4"></canvas>
	<script id="vshader" type="x-shader/x-vertex">
	attribute vec3 a_pos;
	attribute vec4 a_color;
	varying vec4 v_color;

	void main()
	{
	v_color = a_color;
	gl_Position = vec4(a_pos.xyz, 1.0);
	}
	</script>

	<script id="fshader" type="x-shader/x-fragment">
	precision mediump float;

	varying vec4 v_color;

	void main()
	{
	gl_FragColor = v_color;
	}
	</script>

	<script>
	"use strict";

	description("when antialias is enabled, verify default fbo pixels would not be changed between two readPixels without drawing operations");
	var wtu = WebGLTestUtils;
	var N = 4;

	var vertices = new Float32Array([
	1.0, 1.0, 0.0,
	-1.0, -1.0, 0.0]);
	var colors = new Uint8Array([
	255, 0, 0, 255,
	255, 0, 0, 255]);

	var canvas = document.getElementById('canvas');
	var gl = wtu.create3DContext(canvas, {antialias: true});

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

	var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["a_pos", "a_color"]);
	gl.clearColor(0, 0, 0, 1);
	gl.clear(gl.COLOR_BUFFER_BIT);

	var colorOffset = vertices.byteLength;
	var vbo = gl.createBuffer();
	gl.bindBuffer(gl.ARRAY_BUFFER, vbo);
	gl.bufferData(gl.ARRAY_BUFFER, colorOffset + colors.byteLength, gl.STATIC_DRAW);
	gl.bufferSubData(gl.ARRAY_BUFFER, 0, vertices);
	gl.bufferSubData(gl.ARRAY_BUFFER, colorOffset, colors);

	gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
	gl.enableVertexAttribArray(0);
	gl.vertexAttribPointer(1, 4, gl.UNSIGNED_BYTE, true, 0, colorOffset);
	gl.enableVertexAttribArray(1);
	gl.drawArrays(gl.LINES, 0, vertices.length / 3);

	var result_1 = new Uint8Array(N * N * 4);
	var result_2 = new Uint8Array(N * N * 4);
	gl.readPixels(0, 0, N, N, gl.RGBA, gl.UNSIGNED_BYTE, result_1);
	gl.readPixels(0, 0, N, N, gl.RGBA, gl.UNSIGNED_BYTE, result_2);

	var tolerance = 0;
	var diff = new Uint8Array(N * N * 4);
	var failed = wtu.comparePixels(result_1, result_2, tolerance, diff);

	if (failed) {
	testFailed("default fbo pixels had be changed between two readPixels without drawing operations");
	} else {
	testPassed("default fbo pixels had not be changed between two readPixels without drawing operations.");
	}

	gl.bindBuffer(gl.ARRAY_BUFFER, null);
	gl.deleteBuffer(vbo);
	}

	var successfullyParsed = true;
	</script>
	<script src="../../js/js-test-post.js"></script>
	</body>
	</html>