conformance/rendering/point-size.html - chromium/deps/webgl/sdk/tests - 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="../../resources/js-test-pre.js"></script>
 <script src="../resources/webgl-test.js"></script>
 <script src="../resources/webgl-test-utils.js"></script>
 <script id="vshader" type="x-shader/x-vertex">
     attribute vec3 pos;
     attribute vec4 colorIn;
     uniform float pointSize;
     varying vec4 color;

     void main()
     {
         gl_PointSize = pointSize;
         color = colorIn;
         gl_Position = vec4(pos, 1.0);
     }
 </script>

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

     void main()
     {
         gl_FragColor = color;
     }
 </script>
 </head>
 <body>
 <canvas id="testbed" width="2" height="2"></canvas>
 <div id="description"></div>
 <div id="console"></div>
 <script>
     "use strict";
     description('Verify GL_VERTEX_PROGRAM_POINT_SIZE is enabled in WebGL');

     var wtu = WebGLTestUtils;
     var gl = wtu.create3DContext('testbed', { antialias: false });
     shouldBeNonNull("gl");

     gl.disable(gl.BLEND);

     // The choice of (0.4, 0.4) ensures that the centers of the surrounding
     // pixels are not contained within the point when it is of size 1, but
     // that they definitely are when it is of size 2.
     var vertices = new Float32Array([
         0.4, 0.4, 0.0]);
     var colors = new Uint8Array([
         255, 0, 0, 255]);

     var colorOffset = vertices.byteLength;

     var buf = new Uint8Array(2 * 2 * 4);
     var index = 0;

     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);

     function test(program) {
         gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

         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);

         var locPointSize = gl.getUniformLocation(program, 'pointSize');

         shouldBe('gl.getError()', 'gl.NO_ERROR');

         debug('Draw a point of size 1 and verify it does not touch any other pixels.');

         gl.uniform1f(locPointSize, 1.0);
         gl.drawArrays(gl.POINTS, 0, vertices.length / 3);

         shouldBe('gl.getError()', 'gl.NO_ERROR');

         for (var y = 0; y < 2; ++y) {
             for (var x = 0; x < 2; ++x) {
                 var correctColor = (x == 1 && y == 1) ? [255, 0, 0] : [0, 0, 0];
                 wtu.checkCanvasRect(gl, x, y, 1, 1, correctColor);
             }
         }
         gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

         debug('Draw a point of size 2 and verify it fills the appropriate region.');

         var pointSizeRange = gl.getParameter(gl.ALIASED_POINT_SIZE_RANGE);
         if (pointSizeRange[1] >= 2.0) {
             gl.uniform1f(locPointSize, 2.0);
             gl.drawArrays(gl.POINTS, 0, vertices.length / 3);
             shouldBe('gl.getError()', 'gl.NO_ERROR');
             wtu.checkCanvasRect(gl, 0, 0, 2, 2, [255, 0, 0]);
         }
     }

     debug('');
     debug('Pass 1');
     var program1 = wtu.setupProgram(gl, ['vshader', 'fshader'], ['pos', 'colorIn']);
     shouldBe('gl.getError()', 'gl.NO_ERROR');
     test(program1);

     // Under some versions of ANGLE point sprite shader programs were
     // incorrectly reloaded from cache. Rebuilding the shader program and
     // repeating the test simulates the conditions that caused it to fail
     debug('');
     debug('Pass 2');
     var program2 = wtu.setupProgram(gl, ['vshader', 'fshader'], ['pos', 'colorIn']);
     shouldBe('gl.getError()', 'gl.NO_ERROR');
     test(program2);

     var successfullyParsed = true;
 </script>

 <script src="../../resources/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="../../resources/js-test-pre.js"></script>
	<script src="../resources/webgl-test.js"></script>
	<script src="../resources/webgl-test-utils.js"></script>
	<script id="vshader" type="x-shader/x-vertex">
	attribute vec3 pos;
	attribute vec4 colorIn;
	uniform float pointSize;
	varying vec4 color;

	void main()
	{
	gl_PointSize = pointSize;
	color = colorIn;
	gl_Position = vec4(pos, 1.0);
	}
	</script>

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

	void main()
	{
	gl_FragColor = color;
	}
	</script>
	</head>
	<body>
	<canvas id="testbed" width="2" height="2"></canvas>
	<div id="description"></div>
	<div id="console"></div>
	<script>
	"use strict";
	description('Verify GL_VERTEX_PROGRAM_POINT_SIZE is enabled in WebGL');

	var wtu = WebGLTestUtils;
	var gl = wtu.create3DContext('testbed', { antialias: false });
	shouldBeNonNull("gl");

	gl.disable(gl.BLEND);

	// The choice of (0.4, 0.4) ensures that the centers of the surrounding
	// pixels are not contained within the point when it is of size 1, but
	// that they definitely are when it is of size 2.
	var vertices = new Float32Array([
	0.4, 0.4, 0.0]);
	var colors = new Uint8Array([
	255, 0, 0, 255]);

	var colorOffset = vertices.byteLength;

	var buf = new Uint8Array(2 * 2 * 4);
	var index = 0;

	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);

	function test(program) {
	gl.clear(gl.COLOR_BUFFER_BIT \| gl.DEPTH_BUFFER_BIT);

	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);

	var locPointSize = gl.getUniformLocation(program, 'pointSize');

	shouldBe('gl.getError()', 'gl.NO_ERROR');

	debug('Draw a point of size 1 and verify it does not touch any other pixels.');

	gl.uniform1f(locPointSize, 1.0);
	gl.drawArrays(gl.POINTS, 0, vertices.length / 3);

	shouldBe('gl.getError()', 'gl.NO_ERROR');

	for (var y = 0; y < 2; ++y) {
	for (var x = 0; x < 2; ++x) {
	var correctColor = (x == 1 && y == 1) ? [255, 0, 0] : [0, 0, 0];
	wtu.checkCanvasRect(gl, x, y, 1, 1, correctColor);
	}
	}
	gl.clear(gl.COLOR_BUFFER_BIT \| gl.DEPTH_BUFFER_BIT);

	debug('Draw a point of size 2 and verify it fills the appropriate region.');

	var pointSizeRange = gl.getParameter(gl.ALIASED_POINT_SIZE_RANGE);
	if (pointSizeRange[1] >= 2.0) {
	gl.uniform1f(locPointSize, 2.0);
	gl.drawArrays(gl.POINTS, 0, vertices.length / 3);
	shouldBe('gl.getError()', 'gl.NO_ERROR');
	wtu.checkCanvasRect(gl, 0, 0, 2, 2, [255, 0, 0]);
	}
	}

	debug('');
	debug('Pass 1');
	var program1 = wtu.setupProgram(gl, ['vshader', 'fshader'], ['pos', 'colorIn']);
	shouldBe('gl.getError()', 'gl.NO_ERROR');
	test(program1);

	// Under some versions of ANGLE point sprite shader programs were
	// incorrectly reloaded from cache. Rebuilding the shader program and
	// repeating the test simulates the conditions that caused it to fail
	debug('');
	debug('Pass 2');
	var program2 = wtu.setupProgram(gl, ['vshader', 'fshader'], ['pos', 'colorIn']);
	shouldBe('gl.getError()', 'gl.NO_ERROR');
	test(program2);

	var successfullyParsed = true;
	</script>

	<script src="../../resources/js-test-post.js"></script>

	</body>
	</html>