input-with-interpotaion-as-lvalue.html

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<title>Negative tests for writting to a shader input with interpolation qualifier</title>

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

<link rel="stylesheet" href="../../resources/glsl-feature-tests.css"/>

<script src="../../js/js-test-pre.js"></script>

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<!--

According to ESSL 3.00.6 section 4.3.4:

"Variables declared as in or centroid in may not be written to during shader execution.",

these tests ensure that a compile error is generated when using a shader input with interpolation qualifier as l-value.

-->

<script type="application/javascript">

"use strict";

description();

var vertexShaderTemplate = [

    '#version 300 es',

    '$(InterpolationQualifier) out float v_float_varying;',

    'void main()',

    '{',

    '    v_float_varying = 1.0;',

    '    gl_Position = vec4(0.0, 0.0, 0.0, 1.0);',

'}'

].join('\n');

var fragmentShaderTemplate = [

    '#version 300 es',

    'precision mediump float;',

    '$(InterpolationQualifier) in float v_float_varying;',

    'out vec4 my_color;',

    'void main()',

    '{',

    '    v_float_varying = 1.0;',

    '    my_color = vec4(1.0, 0.0, 0.0, v_float_varying);',

'}'

].join('\n');

var errorMessageTemplate = "Writting to shader inputs with '$(InterpolationQualifier)' qualifier must fail";

var testDataList = [

    InterpolationQualifier: 'flat'

},

    InterpolationQualifier: 'smooth'

},

    InterpolationQualifier: 'centroid'

];

var wtu = WebGLTestUtils;

var tests = [];

for (var i = 0; i < testDataList.length; ++i) {

    tests.push({

        vShaderSource: wtu.replaceParams(vertexShaderTemplate, testDataList[i]),

        vShaderSuccess: true,

        fShaderSource: wtu.replaceParams(fragmentShaderTemplate, testDataList[i]),

        fShaderSuccess: false,

        linkSuccess: false,

        passMsg: wtu.replaceParams(errorMessageTemplate, testDataList[i])

});

GLSLConformanceTester.runTests(tests, 2);

</script>

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