sampler-array-struct-function-arg.html

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<meta charset="utf-8">

<title>GLSL struct containing an array of samplers passed into a user-defined function</title>

<link rel="stylesheet" href="../../../resources/js-test-style.css"/>

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<script src="../../../js/webgl-test-utils.js"></script>

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<canvas id="output" style="border: none;" width="64" height="64"></canvas>

<div id="description"></div>

<div id="console"></div>

<script id="fshaderSampler" type="x-shader/x-fragment">

precision mediump float;

struct S {

    sampler2D sam[2];

};

uniform S uni;

vec4 useSampler(S arg)

    return texture2D(arg.sam[0], vec2(0.0, 0.0));

void main() {

    gl_FragColor = vec4(useSampler(uni));

</script>

<script type="application/javascript">

"use strict";

description();

var wtu = WebGLTestUtils;

var canvas = document.getElementById("output");

var gl = wtu.create3DContext(canvas);

if (!gl) {

    testFailed("Could not create a GL context.");

} else {

    debug("Drawing with a shader that uses a sampler array in a struct passed into a function.");

    var program = wtu.setupProgram(

        gl, [wtu.simpleVertexShader, 'fshaderSampler'], ['a_position'], [0], true);

    wtu.setupUnitQuad(gl);

    var tex = gl.createTexture();

    gl.bindTexture(gl.TEXTURE_2D, tex);

    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);

    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);

    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);

    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);

    wtu.fillTexture(gl, tex, 1, 1, [0, 255, 0, 255]);

    wtu.clearAndDrawUnitQuad(gl);

    wtu.checkCanvas(gl, [0, 255, 0, 255], "should be green");

var successfullyParsed = true;

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