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<meta charset="utf-8">
<!--
Copyright (c) 2019 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.
-->
<link rel="stylesheet" type="text/css" href="../unit.css" />
<script type="application/javascript" src="../unit.js"></script>
<script type="application/javascript" src="../util.js"></script>
<script type="application/javascript">

Tests.startUnit = function () {
  var canvas = document.getElementById('gl');
  var gl = getGLContext(canvas);
  return [gl];
}

Tests.testOk = function(gl) {
    var sh = new Filter(gl, 'okvert', 'frag');
    assertOk(function(){sh.apply();});
    sh.destroy();

    var sh = new Filter(gl, 'vert', 'okfrag');
    assertOk(function(){sh.apply();});
    sh.destroy();

    var sh = new Filter(gl, 'vert', 'frag');
    assertOk(function(){sh.apply();});
    sh.destroy();
}

var arr = ['cr', 'cw', 'vr', 'vw'];
arr.forEach(function(e){
    if (e == 'cr' || e == 'cw') {
        Tests['test'+e+'vert'] = function(gl) {
            var sh = new Filter(gl, e+'vert', 'frag');
            assertFail(function(){sh.apply();});
            sh.destroy();
        }
    }
    Tests['test'+e+'frag'] = function(gl) {
        var sh = new Filter(gl, 'vert', e+'frag');
        assertFail(function(){sh.apply();});
        sh.destroy();
    }
});


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


  attribute vec3 Vertex;
  attribute vec2 Tex;
  varying vec2 TexCoord;
  void main()
  {
    TexCoord = Tex;
    float x[3];
    x[0] = 1.0;
    x[1] = 2.0;
    x[2] = 3.0;
    gl_Position = vec4(Vertex, x[2]);
  }
</script>
<script id="crvert" type="x-shader/x-vertex">


  attribute vec3 Vertex;
  attribute vec2 Tex;
  varying vec2 TexCoord;
  void main()
  {
    TexCoord = Tex;
    float x[3];
    x[0] = 1.0;
    x[1] = 2.0;
    x[2] = 3.0;
    gl_Position = vec4(Vertex, x[4]);
  }
</script>
<script id="cwvert" type="x-shader/x-vertex">


  attribute vec3 Vertex;
  attribute vec2 Tex;
  varying vec2 TexCoord;
  void main()
  {
    TexCoord = Tex;
    float x[3];
    x[0] = 1.0;
    x[1] = 2.0;
    x[2] = 3.0;
    x[4] = Vertex.z;
    gl_Position = vec4(Vertex, x[4]);
  }
</script>
<!-- This one can't be required to fail compilation, because vertex shaders must support arbitrary array indexing -->
<script id="vrvert" type="x-shader/x-vertex">


  attribute vec3 Vertex;
  attribute vec2 Tex;
  varying vec2 TexCoord;
  void main()
  {
    TexCoord = Tex;
    float x[3];
    x[0] = 1.0;
    x[1] = 2.0;
    x[2] = 3.0;
    int idx = 4 * int(max(1.0, Vertex.x*20.0));
    gl_Position = vec4(Vertex, x[idx]);
  }
</script>
<!-- This one can't be required to fail compilation, because vertex shaders must support arbitrary array indexing -->
<script id="vwvert" type="x-shader/x-vertex">


  attribute vec3 Vertex;
  attribute vec2 Tex;
  varying vec2 TexCoord;
  void main()
  {
    TexCoord = Tex;
    float x[3];
    x[0] = 1.0;
    x[1] = 2.0;
    x[2] = 3.0;
    int idx = 4 * int(max(1.0, Vertex.x*20.0));
    x[idx] = Vertex.z;
    gl_Position = vec4(Vertex, x[idx]);
  }
</script>
<script id="vert" type="x-shader/x-vertex">


  attribute vec3 Vertex;
  attribute vec2 Tex;
  varying vec2 TexCoord;
  void main()
  {
    TexCoord = Tex;
    gl_Position = vec4(Vertex, 0.0);
  }
</script>

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


  precision mediump float;

  varying vec2 TexCoord;

  void main()
  {
    float x[3];
    x[0] = 1.0;
    x[1] = 2.0;
    x[2] = 3.0;
    gl_FragColor = vec4(1.0, 0.0, TexCoord.s, x[2]);
  }
</script>
<script id="crfrag" type="x-shader/x-fragment">


  precision mediump float;

  varying vec2 TexCoord;

  void main()
  {
    float x[3];
    x[0] = 1.0;
    x[1] = 2.0;
    x[2] = 3.0;
    gl_FragColor = vec4(1.0, 0.0, TexCoord.s, x[4]);
  }
</script>
<script id="cwfrag" type="x-shader/x-fragment">


  precision mediump float;

  varying vec2 TexCoord;

  void main()
  {
    float x[3];
    x[0] = 1.0;
    x[1] = 2.0;
    x[2] = 3.0;

    x[4] = 6.0;
    gl_FragColor = vec4(1.0, 0.0, TexCoord.s, x[4]);
  }
</script>
<!-- This one actually fails because of WebGL's restrictions on indexing expressions in fragment shaders -->
<script id="vrfrag" type="x-shader/x-fragment">


  precision mediump float;

  varying vec2 TexCoord;

  void main()
  {
    float x[3];
    x[0] = 1.0;
    x[1] = 2.0;
    x[2] = 3.0;

    int idx = 4 * int(max(1.0, TexCoord.x*20.0));
    gl_FragColor = vec4(1.0, 0.0, TexCoord.s, x[idx]);
  }
</script>
<!-- This one actually fails because of WebGL's restrictions on indexing expressions in fragment shaders -->
<script id="vwfrag" type="x-shader/x-fragment">


  precision mediump float;

  varying vec2 TexCoord;

  void main()
  {
    float x[3];
    x[0] = 1.0;
    x[1] = 2.0;
    x[2] = 3.0;

    int idx = 4 * int(max(1.0, TexCoord.x*20.0));
    x[idx] = 6.0;
    gl_FragColor = vec4(1.0, 0.0, TexCoord.s, x[idx]);
  }
</script>
<script id="frag" type="x-shader/x-fragment">


  precision mediump float;

  varying vec2 TexCoord;

  void main()
  {
    gl_FragColor = vec4(1.0, 0.0, TexCoord.s, 1.0);
  }
</script>


<style>canvas{ position:absolute; }</style>
</head><body>
  <canvas id="gl" width="16" height="16"></canvas>
</body></html>
