uniforms-should-not-lose-values.html

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Copyright (c) 2019 The Khronos Group Inc.

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<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>Driver Bug - Uniforms should no lose values</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>

<canvas id="canvas" width="512" height="256"> </canvas>

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

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

<script id="vshader" type="x-shader/x-vertex">

uniform float k,u;

uniform mat4 l;

attribute vec3 a;

void main(){

  gl_Position=l*vec4(a,1.+u+k);

</script>

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

precision mediump float;

uniform float w,x,y,z;

void main() {

 gl_FragColor=vec4(1.-y,y,w+x+z,1);

</script>

<script>

"use strict";

// Certain drivers fail this test. Specifically Mac NVidia GT 330 on OSX 10.8.2

description();

debug("");

var wtu = WebGLTestUtils;

function test() {

  var gl = wtu.create3DContext("canvas");

  if (!gl) {

    testFailed("context does not exist");

    return;

  wtu.setupUnitQuad(gl);

  var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["a"], undefined, true);

  var setUniformf = function(name, val) {

    var loc = gl.getUniformLocation(program, name);

    var func = 'uniform' + val.length + 'fv';

    gl[func](loc, val);

};

  var setUniformMat = function(name, val) {

    var loc = gl.getUniformLocation(program, name);

    var func = 'uniformMatrix' + Math.sqrt(val.length) + 'fv';

    gl[func](loc, false, val);

};

  setUniformMat('l', [1, 0 ,0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1]);

  gl.viewport(0, 0, 256, 256);

  setUniformf('y', [0]);

  wtu.drawUnitQuad(gl);

  gl.viewport(256, 0, 256, 256);

  setUniformf('y', [1]);

  wtu.drawUnitQuad(gl);

  wtu.checkCanvasRect(gl, 0, 0, 256, 256, [255, 0, 0, 255]);

  wtu.checkCanvasRect(gl, 256, 0, 256, 256, [0, 255, 0, 255]);

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

test();

var successfullyParsed = true;

</script>

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</body>

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