LayoutTests/webgl/2.0.0/resources/webgl_test_files/conformance/attribs/gl-vertex-attrib-zero-issues.html - WebKit - Git at Google

 <!--

 /*
 ** Copyright (c) 2012 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">
 <title>WebGL Enable Vertex Attrib Zero 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>
 </head>
 <body>
 <canvas id="example" width="50" height="50">
 </canvas>
 <div id="description"></div>
 <div id="console"></div>
 <script id="vshader" type="x-shader/x-vertex">
     attribute vec4 vPosition;
     void main()
     {
         gl_Position = vPosition;
     }
 </script>

 <script id="fshader" type="x-shader/x-fragment">
     void main()
     {
         gl_FragColor = vec4(0.0,1.0,0.0,1.0);
     }
 </script>

 <script>
 "use strict";
 description("Test some of the issues of the difference between attrib 0 on OpenGL vs WebGL");
 debug("");
 var wtu = WebGLTestUtils;
 var gl = wtu.create3DContext("example");
 var g_program;
 var g_attribLocation;
 function setup(attribIndex) {
   var program = wtu.setupProgram(
       gl, ['vshader', 'fshader'], ['vPosition'], [attribIndex]);
   g_program = program;
   g_attribLocation = attribIndex;
   shouldBe("g_attribLocation", "gl.getAttribLocation(g_program, 'vPosition')");
   return program;
 }

 function setupVerts(numVerts) {
   var verts = [
      1.0,  1.0, 0.0,
     -1.0,  1.0, 0.0,
     -1.0, -1.0, 0.0,
      1.0,  1.0, 0.0,
     -1.0, -1.0, 0.0,
      1.0, -1.0, 0.0
   ];
   var positions = new Float32Array(numVerts * 3);
   var indices = new Uint16Array(numVerts);
   for (var ii = 0; ii < numVerts; ++ii) {
     var ndx = ii % 6;
     var dst = ii * 3;
     var src = ndx * 3;
     for (var jj = 0; jj < 3; ++jj) {
       positions[dst + jj] = verts[src + jj];
     }
     indices[ii] = ii;
   }
   var vertexObject = gl.createBuffer();
   gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
   gl.bufferData(gl.ARRAY_BUFFER, positions, gl.STATIC_DRAW);
   var indexBuffer = gl.createBuffer();
   gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);
   gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);
 }

 var p0 = setup(0);
 var p3 = setup(3);
 setupVerts(60000);

 for (var ii = 0; ii < 5; ++ii) {
   // test drawing with attrib 0
   gl.useProgram(p0);
   gl.enableVertexAttribArray(0);
   gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
   gl.clear(gl.COLOR_BUFFER_BIT);
   gl.drawElements(gl.TRIANGLES, 60000, gl.UNSIGNED_SHORT, 0);
   wtu.glErrorShouldBe(
       gl, gl.NO_ERROR,
       "drawing using attrib 0 with 6 verts");
   wtu.checkCanvas(gl, [0, 255, 0, 255], "canvas should be green");
   gl.disableVertexAttribArray(0);

   // test drawing without attrib 0
   gl.useProgram(p3);
   gl.enableVertexAttribArray(3);
   gl.vertexAttribPointer(3, 3, gl.FLOAT, false, 0, 0);
   gl.clear(gl.COLOR_BUFFER_BIT);
   gl.drawArrays(gl.TRIANGLES, 0, 60000);
   wtu.glErrorShouldBe(
       gl, gl.NO_ERROR,
       "drawing using attrib 3 with 60000 verts");
   wtu.checkCanvas(gl, [0, 255, 0, 255], "canvas should be green");
   gl.disableVertexAttribArray(3);

   // This second test of drawing without attrib0 uncovered a bug in chrome
   // where after the draw without attrib0 the attrib 0 emulation code disabled
   // attrib 0 and it was never re-enabled so this next draw failed.
   gl.useProgram(p3);
   gl.enableVertexAttribArray(3);
   gl.clear(gl.COLOR_BUFFER_BIT);
   gl.drawElements(gl.TRIANGLES, 60000, gl.UNSIGNED_SHORT, 0);
   wtu.glErrorShouldBe(
       gl, gl.NO_ERROR,
       "drawing using attrib 3 with 60000 verts");
   wtu.checkCanvas(gl, [0, 255, 0, 255], "canvas should be green");
   gl.disableVertexAttribArray(3);
 }


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

 </body>
 </html>
	<!--

	/*
	** Copyright (c) 2012 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">
	<title>WebGL Enable Vertex Attrib Zero 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>
	</head>
	<body>
	<canvas id="example" width="50" height="50">
	</canvas>
	<div id="description"></div>
	<div id="console"></div>
	<script id="vshader" type="x-shader/x-vertex">
	attribute vec4 vPosition;
	void main()
	{
	gl_Position = vPosition;
	}
	</script>

	<script id="fshader" type="x-shader/x-fragment">
	void main()
	{
	gl_FragColor = vec4(0.0,1.0,0.0,1.0);
	}
	</script>

	<script>
	"use strict";
	description("Test some of the issues of the difference between attrib 0 on OpenGL vs WebGL");
	debug("");
	var wtu = WebGLTestUtils;
	var gl = wtu.create3DContext("example");
	var g_program;
	var g_attribLocation;
	function setup(attribIndex) {
	var program = wtu.setupProgram(
	gl, ['vshader', 'fshader'], ['vPosition'], [attribIndex]);
	g_program = program;
	g_attribLocation = attribIndex;
	shouldBe("g_attribLocation", "gl.getAttribLocation(g_program, 'vPosition')");
	return program;
	}

	function setupVerts(numVerts) {
	var verts = [
	1.0, 1.0, 0.0,
	-1.0, 1.0, 0.0,
	-1.0, -1.0, 0.0,
	1.0, 1.0, 0.0,
	-1.0, -1.0, 0.0,
	1.0, -1.0, 0.0
	];
	var positions = new Float32Array(numVerts * 3);
	var indices = new Uint16Array(numVerts);
	for (var ii = 0; ii < numVerts; ++ii) {
	var ndx = ii % 6;
	var dst = ii * 3;
	var src = ndx * 3;
	for (var jj = 0; jj < 3; ++jj) {
	positions[dst + jj] = verts[src + jj];
	}
	indices[ii] = ii;
	}
	var vertexObject = gl.createBuffer();
	gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
	gl.bufferData(gl.ARRAY_BUFFER, positions, gl.STATIC_DRAW);
	var indexBuffer = gl.createBuffer();
	gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);
	gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);
	}

	var p0 = setup(0);
	var p3 = setup(3);
	setupVerts(60000);

	for (var ii = 0; ii < 5; ++ii) {
	// test drawing with attrib 0
	gl.useProgram(p0);
	gl.enableVertexAttribArray(0);
	gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
	gl.clear(gl.COLOR_BUFFER_BIT);
	gl.drawElements(gl.TRIANGLES, 60000, gl.UNSIGNED_SHORT, 0);
	wtu.glErrorShouldBe(
	gl, gl.NO_ERROR,
	"drawing using attrib 0 with 6 verts");
	wtu.checkCanvas(gl, [0, 255, 0, 255], "canvas should be green");
	gl.disableVertexAttribArray(0);

	// test drawing without attrib 0
	gl.useProgram(p3);
	gl.enableVertexAttribArray(3);
	gl.vertexAttribPointer(3, 3, gl.FLOAT, false, 0, 0);
	gl.clear(gl.COLOR_BUFFER_BIT);
	gl.drawArrays(gl.TRIANGLES, 0, 60000);
	wtu.glErrorShouldBe(
	gl, gl.NO_ERROR,
	"drawing using attrib 3 with 60000 verts");
	wtu.checkCanvas(gl, [0, 255, 0, 255], "canvas should be green");
	gl.disableVertexAttribArray(3);

	// This second test of drawing without attrib0 uncovered a bug in chrome
	// where after the draw without attrib0 the attrib 0 emulation code disabled
	// attrib 0 and it was never re-enabled so this next draw failed.
	gl.useProgram(p3);
	gl.enableVertexAttribArray(3);
	gl.clear(gl.COLOR_BUFFER_BIT);
	gl.drawElements(gl.TRIANGLES, 60000, gl.UNSIGNED_SHORT, 0);
	wtu.glErrorShouldBe(
	gl, gl.NO_ERROR,
	"drawing using attrib 3 with 60000 verts");
	wtu.checkCanvas(gl, [0, 255, 0, 255], "canvas should be green");
	gl.disableVertexAttribArray(3);
	}


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

	</body>
	</html>