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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.
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>GLSL switch/case corner case test</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>
<script src="../../js/glsl-conformance-test.js"></script>
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<script id="fshaderDeclarationInsideSwitch" type="x-shader/x-fragment">#version 300 es

precision highp float;
out vec4 my_FragColor;

uniform int u_zero;

void main()
{
    my_FragColor = vec4(1, 0, 0, 1);
    switch (u_zero)
    {
        case 0:
            ivec2 i;
            i = ivec2(1, 0);
            my_FragColor = vec4(0, i[0], 0, 1);
    }
}
</script>
<script id="fshaderDeclarationInsideSwitchDefault" type="x-shader/x-fragment">#version 300 es

precision highp float;
out vec4 my_FragColor;

uniform int u_zero;

void main()
{
    my_FragColor = vec4(1, 0, 0, 1);
    switch (u_zero)
    {
        default:
            ivec2 i;
            i = ivec2(1, 0);
            my_FragColor = vec4(0, i[0], 0, 1);
    }
}
</script>
<script id="fshaderDeclarationInsideSwitchLiteral" type="x-shader/x-fragment">#version 300 es

precision highp float;
out vec4 my_FragColor;

void main()
{
    my_FragColor = vec4(1, 0, 0, 1);
    switch (0)
    {
        case 0:
            ivec2 i;
            i = ivec2(1, 0);
            my_FragColor = vec4(0, i[0], 0, 1);
    }
}
</script>
<script id="fshaderDeclarationInsideSwitchLiteralDefault" type="x-shader/x-fragment">#version 300 es

precision highp float;
out vec4 my_FragColor;

void main()
{
    my_FragColor = vec4(1, 0, 0, 1);
    switch (0)
    {
        default:
            ivec2 i;
            i = ivec2(1, 0);
            my_FragColor = vec4(0, i[0], 0, 1);
    }
}
</script>
<script id="fshaderDeclarationInsideSwitchScope" type="x-shader/x-fragment">#version 300 es

precision highp float;
out vec4 my_FragColor;

uniform int u_zero;

// GLSL ES 3.10 clarifies the scoping rules that are relevant here. In section 4.2.2 it says:
// "The statement following a switch (...) forms a nested scope."
// There are no other special scoping rules with regards to switch statements.

void main()
{
    my_FragColor = vec4(1, 0, 0, 1);
    switch (u_zero)
    {
        case 0:
            ivec2 i;
            i = ivec2(1, 0);
        default:
            my_FragColor = vec4(0, i[0], 0, 1);
    }
}
</script>
<script id="fshaderFallThroughAll" type="x-shader/x-fragment">#version 300 es

precision highp float;

out vec4 my_FragColor;

uniform int u_zero;

void main()
{
    int i = 0;
    // switch should fall through both cases.
    switch(u_zero)
    {
        case 0:
            i += 1;
        case 1:
            i += 2;
    }
    if (i == 3)
    {
        my_FragColor = vec4(0, 1, 0, 1);
    }
    else
    {
        my_FragColor = vec4(1, 0, 0, 1);
    }
}
</script>
<script id="fshaderEmptySwitchStatement" type="x-shader/x-fragment">#version 300 es

precision highp float;

out vec4 my_FragColor;

uniform int u_zero;

void main()
{
    switch(u_zero)
    {
    }
    my_FragColor = vec4(0, 1, 0, 1);
}
</script>
<script id="fshaderLastCaseHasEmptyDeclaration" type="x-shader/x-fragment">#version 300 es

precision highp float;

out vec4 my_FragColor;

uniform int u_zero;

void main()
{
    // Empty declaration should count as a statement.
    switch(u_zero)
    {
        case 0:
            int;
    }
    my_FragColor = vec4(0, 1, 0, 1);
}
</script>
<script id="fshaderLastCaseHasEmptyBlock" type="x-shader/x-fragment">#version 300 es

precision highp float;

out vec4 my_FragColor;

uniform int u_zero;

void main()
{
    // Empty block should count as a statement.
    switch(u_zero)
    {
        case 0:
            {}
    }
    my_FragColor = vec4(0, 1, 0, 1);
}
</script>
<script id="fshaderLastCaseHasConstantStatement" type="x-shader/x-fragment">#version 300 es

precision highp float;

out vec4 my_FragColor;

uniform int u_zero;

void main()
{
    // Empty statement should count as a statement.
    switch(u_zero)
    {
        case 0:
            0;
    }
    my_FragColor = vec4(0, 1, 0, 1);
}
</script>
<script id="fshaderLastCaseHasEmptyStatement" type="x-shader/x-fragment">#version 300 es

precision highp float;

out vec4 my_FragColor;

uniform int u_zero;

void main()
{
    // Empty statement should count as a statement.
    switch(u_zero)
    {
        case 0:
            ;
    }
    my_FragColor = vec4(0, 1, 0, 1);
}
</script>
<script id="fshaderCaseInsideBlock" type="x-shader/x-fragment">#version 300 es

precision highp float;

out vec4 my_FragColor;

uniform int u_zero;

void main()
{
    // Case statements must not be nested in blocks.
    // GLSL ES 3.00 spec is a bit vague on this but GLSL ES 3.10 section 6.2 is clearer.
    switch(u_zero)
    {
        case 1:
        {
            case 0:
                my_FragColor = vec4(1, 0, 0, 1);
        }
    }
    my_FragColor = vec4(0, 1, 0, 1);
}
</script>
<script type="application/javascript">
"use strict";
description();

// Covers bugs:
// http://anglebug.com/2177
// http://anglebug.com/2178
// http://anglebug.com/2179

GLSLConformanceTester.runTests([
{
  fShaderId: 'fshaderDeclarationInsideSwitch',
  fShaderSuccess: true,
  linkSuccess: true,
  passMsg: 'Declaration inside switch should work.',
  render: true
},
{
  fShaderId: 'fshaderDeclarationInsideSwitchDefault',
  fShaderSuccess: true,
  linkSuccess: true,
  passMsg: 'Declaration inside switch default case should work.',
  render: true
},
{
  fShaderId: 'fshaderDeclarationInsideSwitchLiteral',
  fShaderSuccess: true,
  linkSuccess: true,
  passMsg: 'Declaration inside switch with literal value should work.',
  render: true
},
{
  fShaderId: 'fshaderDeclarationInsideSwitchLiteralDefault',
  fShaderSuccess: true,
  linkSuccess: true,
  passMsg: 'Declaration inside switch with literal value and default case should work.',
  render: true
},
{
  fShaderId: 'fshaderDeclarationInsideSwitchScope',
  fShaderSuccess: true,
  linkSuccess: true,
  passMsg: 'Declaration inside switch should be scoped until the end of the switch statement.',
  render: true
},
{
  fShaderId: 'fshaderFallThroughAll',
  fShaderSuccess: true,
  linkSuccess: true,
  passMsg: 'Falling through all cases in switch/case should work.',
  render: true
},
{
  fShaderId: 'fshaderEmptySwitchStatement',
  fShaderSuccess: true,
  linkSuccess: true,
  passMsg: 'Empty switch statements are valid.'
},
{
  fShaderId: 'fshaderLastCaseHasEmptyDeclaration',
  fShaderSuccess: true,
  linkSuccess: true,
  passMsg: 'Empty declaration should count as a statement for the purposes of switch statement validation.'
},
{
  fShaderId: 'fshaderLastCaseHasEmptyBlock',
  fShaderSuccess: true,
  linkSuccess: true,
  passMsg: 'Empty block should count as a statement for the purposes of switch statement validation.'
},
{
  fShaderId: 'fshaderLastCaseHasConstantStatement',
  fShaderSuccess: true,
  linkSuccess: true,
  passMsg: 'Constant statement should count as a statement for the purposes of switch statement validation.'
},
{
  fShaderId: 'fshaderLastCaseHasEmptyStatement',
  fShaderSuccess: true,
  linkSuccess: true,
  passMsg: 'Empty statement should count as a statement for the purposes of switch statement validation.'
},
{
  fShaderId: 'fshaderCaseInsideBlock',
  fShaderSuccess: false,
  passMsg: 'Case statements must not be nested inside blocks.'
}
], 2);
</script>
</body>
</html>