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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL uniform struct Conformance Test</title>
<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>
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<canvas id="example" width="2" height="2"> </canvas>

<script id="vshader" type="x-shader/x-vertex">
attribute vec4 vPosition;
uniform vec4 u0;
struct MyStruct {
  vec4 var1;
  vec4 var2;
  vec4 var3;
  vec4 var4;
};
uniform MyStruct u1;
uniform vec4 u2;
varying vec4 v_color;
void main()
{
  gl_Position = vPosition;
  v_color = (u0 + u2 + u1.var1) - vec4(2.0);
}
</script>

<script id="fshader" type="x-shader/x-fragment">
precision mediump float;
varying vec4 v_color;
void main()
{
  gl_FragColor = v_color;
}
</script>

<script>
"use strict";
description("This test ensures WebGL implementations handle unused members at the end of structs correctly.");

var wtu = WebGLTestUtils;
var gl = wtu.create3DContext();
var c = document.getElementById("console");
program = wtu.setupProgram(gl, ["vshader", "fshader"], [ "vPosition"]);

wtu.setupUnitQuad(gl, [0, 1]);
var white = [1.0, 1.0, 1.0, 1.0];
var black = [0.0, 0.0, 0.0, 0.0];
gl.uniform4fv(gl.getUniformLocation(program, "u0"), white);
gl.uniform4fv(gl.getUniformLocation(program, "u1.var1"), white);
gl.uniform4fv(gl.getUniformLocation(program, "u1.var2"), black);
gl.uniform4fv(gl.getUniformLocation(program, "u1.var3"), black);
gl.uniform4fv(gl.getUniformLocation(program, "u1.var4"), black);
gl.uniform4fv(gl.getUniformLocation(program, "u2"), white);
wtu.clearAndDrawUnitQuad(gl);
wtu.checkCanvas(gl, [255, 255, 255, 255], "should be white", 0);
gl.uniform4fv(gl.getUniformLocation(program, "u1.var2"), black);
gl.uniform4fv(gl.getUniformLocation(program, "u1.var3"), black);
gl.uniform4fv(gl.getUniformLocation(program, "u1.var4"), black);
wtu.clearAndDrawUnitQuad(gl, [0, 0, 0, 0]);
wtu.checkCanvas(gl, [255, 255, 255, 255], "should still be white", 0);

wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no GL errors");
debug("");
var successfullyParsed = true;

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

</body>
</html>