<!--
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.
-->

<!DOCTYPE html>
<html>

<head>
<meta charset="utf-8">
<title>Unary minus operator on int or uint variables in a dynamic loop in vertex shader should work</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" style="border: none;" width="1024" height="128"></canvas>
<div id="description"></div>
<div id="console"></div>

<script id="shader-vs-int" type="x-shader/x-vertex">#version 300 es
in highp vec4 pos;

uniform int u_one;
uniform int u_two;
uniform int u_three;

out mediump vec4 v_color;
void main() {
  int array[3];
  array[0] = u_one; // array[0] should be 1
  array[1] = -u_two; // array[1] should be -2
  array[2] = u_three; // array[2] should be 3
  int result = 0;
  for (int i = 0; i < u_three; i++) {
    result += array[i];
  }
  v_color = (result == 2) ? vec4(0, 1, 0, 1) : vec4(1, 0, 0, 1);
  gl_Position = pos;
}
</script>

<script id="shader-vs-uint" type="x-shader/x-vertex">#version 300 es
in highp vec4 pos;

uniform uint u_one;
uniform uint u_two;
uniform uint u_three;

out mediump vec4 v_color;
void main() {
  uint array[3];
  array[0] = u_one; // array[0] should be 1u
  array[1] = -u_two; // array[1] should be -2u
  array[2] = u_three; // array[2] should be 3u
  uint result = 0u;
  for (uint i = 0u; i < u_three; i++) {
    result += array[i];
  }
  v_color = (result == 2u) ? vec4(0, 1, 0, 1) : vec4(1, 0, 0, 1);
  gl_Position = pos;
}
</script>

<script id="shader-vs-int-multiple-brackets" type="x-shader/x-vertex">#version 300 es
in highp vec4 pos;

uniform int u_one;
uniform int u_two;
uniform int u_three;

out mediump vec4 v_color;
void main() {
  int array[3];
  array[0] = u_one; // array[0] should be 1
  array[1] = -(-(-u_two + 1) + 1); // array[1] should be -2
  array[2] = u_three; // array[2] should be 3
  int result = 0;
  for (int i = 0; i < u_three; i++) {
    result += array[i];
  }
  v_color = (result == 2) ? vec4(0, 1, 0, 1) : vec4(1, 0, 0, 1);
  gl_Position = pos;
}
</script>

<script id="shader-vs-uint-multiple-brackets" type="x-shader/x-vertex">#version 300 es
in highp vec4 pos;

uniform uint u_one;
uniform uint u_two;
uniform uint u_three;

out mediump vec4 v_color;
void main() {
  uint array[3];
  array[0] = u_one; // array[0] should be 1u
  array[1] = -(-(-u_two + 1u) + 1u); // array[1] should be -2u
  array[2] = u_three; // array[2] should be 3u
  uint result = 0u;
  for (uint i = 0u; i < u_three; i++) {
    result += array[i];
  }
  v_color = (result == 2u) ? vec4(0, 1, 0, 1) : vec4(1, 0, 0, 1);
  gl_Position = pos;
}
</script>

<script id="shader-vs-int-implicit-unary-minus" type="x-shader/x-vertex">#version 300 es
in highp vec4 pos;

uniform int u_one;
uniform int u_two;
uniform int u_three;

out mediump vec4 v_color;
void main() {
  int array[3];
  array[0] = u_one; // array[0] should be 1
  array[1] = 1 - u_two;
  array[2] = u_three; // array[2] should be 3
  int result = 0;
  array[1] -= 1; // array[1] should be -u_two == -2
  for (int i = 0; i < u_three; i++) {
    result += array[i];
  }
  v_color = (result == 2) ? vec4(0, 1, 0, 1) : vec4(1, 0, 0, 1);
  gl_Position = pos;
}
</script>

<script id="shader-vs-uint-implicit-unary-minus" type="x-shader/x-vertex">#version 300 es
in highp vec4 pos;

uniform uint u_one;
uniform uint u_two;
uniform uint u_three;

out mediump vec4 v_color;
void main() {
  uint array[3];
  array[0] = u_one; // array[0] should be 1u
  array[1] = 1u - u_two;
  array[2] = u_three; // array[2] should be 3u
  uint result = 0u;
  array[1] -= 1u; // array[1] should be -u_two == -2u
  for (uint i = 0u; i < u_three; i++) {
    result += array[i];
  }
  v_color = (result == 2u) ? vec4(0, 1, 0, 1) : vec4(1, 0, 0, 1);
  gl_Position = pos;
}
</script>

<script id="shader-fs" type="x-shader/x-fragment">#version 300 es
in mediump vec4 v_color;
out mediump vec4 o_color;

void main() {
  o_color = v_color;
}
</script>

<script>
"use strict";

function test() {
  description();
  debug("This test exposes an Intel driver bug on Windows.");
  debug("");

  var wtu = WebGLTestUtils;
  var gl = wtu.create3DContext("canvas", undefined, 2);
  if (!gl) {
    testFailed("WebGL 2 context does not exist");
    return;
  }

  var testNum = 0;
  var border = 10; // border between test squares for visibility
  var squareSize = 128;
  var expectedColor = [0, 255, 0, 255]; // green

  function subTest_int(message, VertexShader) {
    debug(message);
    var startX = (squareSize + border) * testNum;
    var program = wtu.setupProgram(
      gl, [VertexShader, "shader-fs"], ["pos"], null, true);
    gl.viewport(startX, 0, squareSize, squareSize);

    var one = gl.getUniformLocation(program, "u_one");
    var two = gl.getUniformLocation(program, "u_two");
    var three = gl.getUniformLocation(program, "u_three");
    gl.uniform1i(one, 1);
    gl.uniform1i(two, 2);
    gl.uniform1i(three, 3);

    wtu.drawUnitQuad(gl);
    wtu.checkCanvasRect(
      gl, startX, 0, squareSize, squareSize,
      expectedColor, "square should be green", 1);
    debug("");
    testNum++;
  }

  function subTest_uint(message, VertexShader) {
    debug(message);
    var startX = (squareSize + border) * testNum;
    var program = wtu.setupProgram(
      gl, [VertexShader, "shader-fs"], ["pos"], null, true);
    gl.viewport(startX, 0, squareSize, squareSize);

    var one = gl.getUniformLocation(program, "u_one");
    var two = gl.getUniformLocation(program, "u_two");
    var three = gl.getUniformLocation(program, "u_three");
    gl.uniform1ui(one, 1);
    gl.uniform1ui(two, 2);
    gl.uniform1ui(three, 3);

    wtu.drawUnitQuad(gl);
    wtu.checkCanvasRect(
      gl, startX, 0, squareSize, squareSize,
      expectedColor, "square should be green", 1);
    debug("");
    testNum++;
  }

  if (!gl) {
    testFailed("context does not exist");
  } else {
    wtu.setupUnitQuad(gl);
    subTest_int("Test unary minus operator on int.", "shader-vs-int");
    subTest_uint("Test unary minus operator on unsigned int.", "shader-vs-uint");
    subTest_int("Test unary minus operator on int with multiple brackets.", "shader-vs-int-multiple-brackets");
    subTest_uint("Test unary minus operator on unsigned int with multiple brackets.", "shader-vs-uint-multiple-brackets");
    subTest_int("Test implicit unary minus operator on int.", "shader-vs-int-implicit-unary-minus");
    subTest_uint("Test implicit unary minus operator on unsigned int.", "shader-vs-uint-implicit-unary-minus");
  }
}

test();
var successfullyParsed = true;
finishTest();
</script>
</body>
</html>
