1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
<!--
/*
** Copyright (c) 2013 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 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>
|
