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Copyright (c) 2022 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.
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL getUniform from non-current program</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>
<div id="console"></div>
<canvas id="example" width="2" height="2"> </canvas>
    <script id="vshader" type="x-shader/x-vertex">
        attribute vec4 vPosition;
        void main()
        {
            gl_Position = vPosition;
        }
    </script>

    <script id="fshader" type="x-shader/x-fragment">
        precision mediump float;
        uniform float color;
        void main()
        {
            gl_FragColor = vec4(color);
        }
    </script>
<script>
"use strict";
description("This test ensures WebGL implementations handle getUniform when the program is not the current program");

debug("");

var wtu = WebGLTestUtils;
var gl = wtu.create3DContext("example");
var program1 = wtu.setupProgram(gl, ["vshader", "fshader"], ["vPosition"]);
var program2 = wtu.setupProgram(gl, ["vshader", "fshader"], ["vPosition"]);
var loc = gl.getUniformLocation(program1, "color");

debug("check we can call getUniform when the program is current")
gl.useProgram(program1);
shouldBe("gl.getUniform(program1, loc)", "0");
debug("check we can call getUniform when a different program is current")
gl.useProgram(program2);
shouldBe("gl.getUniform(program1, loc)", "0");
debug("check we can call getUniform when no program is current")
gl.useProgram(null);
shouldBe("gl.getUniform(program1, loc)", "0");

debug("check we can call getUniform when the program is current")
gl.useProgram(program1);
gl.uniform1f(loc, 123)
shouldBe("gl.getUniform(program1, loc)", "123");
debug("check we can call getUniform when a different program is current")
gl.useProgram(program2);
shouldBe("gl.getUniform(program1, loc)", "123");
debug("check we can call getUniform when no program is current")
gl.useProgram(null);
shouldBe("gl.getUniform(program1, loc)", "123");


wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should no errors");

debug("");
var successfullyParsed = true;

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

</body>
</html>
