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| <!-- | |
| 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 Point with gl_PointCoord in Fragment Shader 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> | |
| <div id="description"></div> | |
| <canvas id="canvas" width="64" height="64"> </canvas> | |
| <div id="console"></div> | |
| <script id="vs" type="x-shader/x-vertex"> | |
| varying vec4 v_color; | |
| // The X and Y coordinates of the center of the point. | |
| attribute vec2 a_vertex; | |
| uniform float u_pointSize; | |
| void main(void) { | |
| gl_PointSize = u_pointSize; | |
| gl_Position = vec4(a_vertex, 0.0, 1.0); | |
| // The color of the point. | |
| v_color = vec4(0.0, 1.0, 0.0, 1.0); | |
| } | |
| </script> | |
| <script id="fs" type="x-shader/x-fragment"> | |
| precision mediump float; | |
| varying vec4 v_color; | |
| void main(void) { | |
| // It seems as long as this mathematical expression references | |
| // gl_PointCoord, the fragment's color is incorrect. | |
| vec2 diff = gl_PointCoord - vec2(.5, .5); | |
| if (length(diff) > 0.5) | |
| discard; | |
| // The point should be a solid color. | |
| gl_FragColor = v_color; | |
| } | |
| </script> | |
| <script> | |
| "use strict"; | |
| // Radar 13239314 | |
| description("This is a regression test for a graphics driver bug affecting end caps on roads in MapsGL."); | |
| debug(""); | |
| var wtu = WebGLTestUtils; | |
| var canvas = document.getElementById("canvas"); | |
| var canvasWidth = canvas.width; | |
| var canvasHeight = canvas.height; | |
| var output = document.getElementById("console"); | |
| var gl = wtu.create3DContext(canvas); | |
| function runTest() { | |
| var pointSizeRange = gl.getParameter(gl.ALIASED_POINT_SIZE_RANGE); | |
| // This test can't really run without a maximum point size of at least 2 | |
| if (pointSizeRange[1] < 2.0) { | |
| debug("This test needs a maximum ALIASED_POINT_SIZE_RANGE of at least 2"); | |
| return; | |
| } | |
| var vs = wtu.loadShaderFromScript(gl, "vs", gl.VERTEX_SHADER); | |
| var fs = wtu.loadShaderFromScript(gl, "fs", gl.FRAGMENT_SHADER); | |
| if (!vs || !fs) { | |
| testFailed("Loading shaders failed"); | |
| return; | |
| } | |
| var program = wtu.setupProgram(gl, [vs, fs], ['a_vertex']); | |
| if (!program) { | |
| testFailed("Loading program failed"); | |
| return; | |
| } | |
| gl.useProgram(program); | |
| gl.clearColor(0, 0, 0, 1.0); | |
| gl.disable(gl.DEPTH_TEST); | |
| gl.clear(gl.COLOR_BUFFER_BIT); | |
| // uniform float u_pointSize; | |
| var uni = gl.getUniformLocation(program, 'u_pointSize'); | |
| gl.uniform1f(uni, Math.min(20.0, pointSizeRange[1])); | |
| // vertex | |
| var buffer = gl.createBuffer(); | |
| gl.bindBuffer(gl.ARRAY_BUFFER, buffer); | |
| var vertexData = new Float32Array([ | |
| 0, 0, | |
| ]); | |
| gl.bufferData(gl.ARRAY_BUFFER, vertexData, gl.STATIC_DRAW); | |
| gl.enableVertexAttribArray(0); | |
| gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0); | |
| gl.drawArrays(gl.POINTS, 0, 1); | |
| wtu.checkCanvasRect(gl, canvasWidth / 2, canvasHeight / 2, 1, 1, | |
| [0, 255, 0, 255], "Center pixel should be green", 2); | |
| } | |
| runTest(); | |
| debug(""); | |
| var successfullyParsed = true; | |
| </script> | |
| <script src="../../js/js-test-post.js"></script> | |
| </body> | |
| </html> |