LayoutTests/webgl/2.0.0/resources/webgl_test_files/conformance/rendering/culling.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">
 <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 id="vshader" type="x-shader/x-vertex">
 attribute vec2 pos;

 void main()
 {
     gl_Position = vec4(pos, 0, 1);
 }
 </script>

 <script id="fshader" type="x-shader/x-fragment">
 precision mediump float;
 uniform vec4 col;

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

 <script>
 "use strict";
 var wtu = WebGLTestUtils;

 function draw(gl, arr, colLoc, col) {
     var vertices = new Float32Array(arr);
     var vertBuf = gl.createBuffer();
     gl.bindBuffer(gl.ARRAY_BUFFER, vertBuf);
     gl.bufferData(gl.ARRAY_BUFFER, vertices, gl.STATIC_DRAW);
     gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0);
     gl.uniform4fv(colLoc, col);
     gl.drawArrays(gl.TRIANGLE_STRIP, 0, vertices.length / 2);
 }

 function clear(gl, col) {
     gl.clearColor(col[0], col[1], col[2], col[3]);
     gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
 }

 function check(gl, winding, shoulddraw) {
     var msg = winding + ' face was ' + (shoulddraw ? '' : 'not ') + 'drawn.';
     wtu.checkCanvasRect(gl, 0, 0, 1, 1, [0, 255, 0, 255], msg);
 }

 function runTest() {
     var cwVertices = [-1, -1, -1, 1, 1, -1, 1, 1];
     var ccwVertices = [-1, 1, -1, -1, 1, 1, 1, -1];
     var red = [1, 0, 0, 1];
     var green = [0, 1, 0, 1];
     var ok;

     var gl = wtu.create3DContext('testbed', { antialias: false });
     if (!gl) {
         testFailed('could not create context');
         return;
     }
     var program = wtu.setupProgram(gl, ['vshader', 'fshader'], ['pos']);
     var colLoc = gl.getUniformLocation(program, 'col');

     gl.enableVertexAttribArray(0);

     debug('CULL_FACE should be off by default');
     clear(gl, red);
     draw(gl, ccwVertices, colLoc, green);
     check(gl, 'CCW', true);
     clear(gl, red);
     draw(gl, cwVertices, colLoc, green);
     check(gl, 'CW', true);

     debug('Enabling CULL_FACE');
     gl.enable(gl.CULL_FACE);

     debug('BACK and CCW should be set by default');
     clear(gl, red);
     draw(gl, ccwVertices, colLoc, green);
     check(gl, 'CCW', true);
     clear(gl, green);
     draw(gl, cwVertices, colLoc, red);
     check(gl, 'CW', false);

     var tests = [{ cullFace : 'BACK', frontFace : 'CCW', drawCCW : true, drawCW : false},
                  { cullFace : 'BACK', frontFace : 'CW', drawCCW : false, drawCW : true},
                  { cullFace : 'FRONT', frontFace : 'CCW', drawCCW : false, drawCW : true },
                  { cullFace : 'FRONT', frontFace : 'CW', drawCCW : true, drawCW : false},
                  { cullFace : 'FRONT_AND_BACK', frontFace : 'CCW', drawCCW : false, drawCW : false},
                  { cullFace : 'FRONT_AND_BACK', frontFace : 'CW', drawCCW : false, drawCW : false}];

     for (var i = 0; i < tests.length; ++i) {
         var t = tests[i];
         debug('Setting ' + t.cullFace + ' and ' + t.frontFace);
         gl.cullFace(gl[t.cullFace]);
         gl.frontFace(gl[t.frontFace]);
         clear(gl, t.drawCCW ? red : green);
         draw(gl, ccwVertices, colLoc, t.drawCCW ? green : red);
         check(gl, 'CCW', t.drawCCW);
         clear(gl, t.drawCW ? red : green);
         draw(gl, cwVertices, colLoc, t.drawCW ? green : red);
         check(gl, 'CW', t.drawCW);
     }
 }
 </script>
 </head>
 <body>
 <canvas id="testbed" width="16" height="16" style="width:50px; height:50px"></canvas>
 <div id="description"></div>
 <div id="console"></div>
 <script>
 "use strict";
 description('Verify that culling works');
 runTest();
 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">
	<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 id="vshader" type="x-shader/x-vertex">
	attribute vec2 pos;

	void main()
	{
	gl_Position = vec4(pos, 0, 1);
	}
	</script>

	<script id="fshader" type="x-shader/x-fragment">
	precision mediump float;
	uniform vec4 col;

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

	<script>
	"use strict";
	var wtu = WebGLTestUtils;

	function draw(gl, arr, colLoc, col) {
	var vertices = new Float32Array(arr);
	var vertBuf = gl.createBuffer();
	gl.bindBuffer(gl.ARRAY_BUFFER, vertBuf);
	gl.bufferData(gl.ARRAY_BUFFER, vertices, gl.STATIC_DRAW);
	gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0);
	gl.uniform4fv(colLoc, col);
	gl.drawArrays(gl.TRIANGLE_STRIP, 0, vertices.length / 2);
	}

	function clear(gl, col) {
	gl.clearColor(col[0], col[1], col[2], col[3]);
	gl.clear(gl.COLOR_BUFFER_BIT \| gl.DEPTH_BUFFER_BIT);
	}

	function check(gl, winding, shoulddraw) {
	var msg = winding + ' face was ' + (shoulddraw ? '' : 'not ') + 'drawn.';
	wtu.checkCanvasRect(gl, 0, 0, 1, 1, [0, 255, 0, 255], msg);
	}

	function runTest() {
	var cwVertices = [-1, -1, -1, 1, 1, -1, 1, 1];
	var ccwVertices = [-1, 1, -1, -1, 1, 1, 1, -1];
	var red = [1, 0, 0, 1];
	var green = [0, 1, 0, 1];
	var ok;

	var gl = wtu.create3DContext('testbed', { antialias: false });
	if (!gl) {
	testFailed('could not create context');
	return;
	}
	var program = wtu.setupProgram(gl, ['vshader', 'fshader'], ['pos']);
	var colLoc = gl.getUniformLocation(program, 'col');

	gl.enableVertexAttribArray(0);

	debug('CULL_FACE should be off by default');
	clear(gl, red);
	draw(gl, ccwVertices, colLoc, green);
	check(gl, 'CCW', true);
	clear(gl, red);
	draw(gl, cwVertices, colLoc, green);
	check(gl, 'CW', true);

	debug('Enabling CULL_FACE');
	gl.enable(gl.CULL_FACE);

	debug('BACK and CCW should be set by default');
	clear(gl, red);
	draw(gl, ccwVertices, colLoc, green);
	check(gl, 'CCW', true);
	clear(gl, green);
	draw(gl, cwVertices, colLoc, red);
	check(gl, 'CW', false);

	var tests = [{ cullFace : 'BACK', frontFace : 'CCW', drawCCW : true, drawCW : false},
	{ cullFace : 'BACK', frontFace : 'CW', drawCCW : false, drawCW : true},
	{ cullFace : 'FRONT', frontFace : 'CCW', drawCCW : false, drawCW : true },
	{ cullFace : 'FRONT', frontFace : 'CW', drawCCW : true, drawCW : false},
	{ cullFace : 'FRONT_AND_BACK', frontFace : 'CCW', drawCCW : false, drawCW : false},
	{ cullFace : 'FRONT_AND_BACK', frontFace : 'CW', drawCCW : false, drawCW : false}];

	for (var i = 0; i < tests.length; ++i) {
	var t = tests[i];
	debug('Setting ' + t.cullFace + ' and ' + t.frontFace);
	gl.cullFace(gl[t.cullFace]);
	gl.frontFace(gl[t.frontFace]);
	clear(gl, t.drawCCW ? red : green);
	draw(gl, ccwVertices, colLoc, t.drawCCW ? green : red);
	check(gl, 'CCW', t.drawCCW);
	clear(gl, t.drawCW ? red : green);
	draw(gl, cwVertices, colLoc, t.drawCW ? green : red);
	check(gl, 'CW', t.drawCW);
	}
	}
	</script>
	</head>
	<body>
	<canvas id="testbed" width="16" height="16" style="width:50px; height:50px"></canvas>
	<div id="description"></div>
	<div id="console"></div>
	<script>
	"use strict";
	description('Verify that culling works');
	runTest();
	var successfullyParsed = true;
	</script>
	<script src="../../js/js-test-post.js"></script>
	</body>
	</html>