| <!-- |
| 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> |