shaders-with-constant-expression-loop-conditions.html

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<title>WebGL GLSL Conformance Tests</title>

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<script id="vertexShaderLiteralLoopCondition" type="text/something-not-javascript">

attribute vec4 a_position;

void main()

    for (int i = 0; i < 5 + 5; i++) { }

    gl_Position = a_position;

</script>

<script id="fragmentShaderLiteralLoopCondition" type="text/something-not-javascript">

void main()

    for (int i = 0; i < 5 + 5; i++) { }

    gl_FragColor = vec4(1.0);

</script>

<script id="vertexShaderConstVarLoopCondition" type="text/something-not-javascript">

attribute vec4 a_position;

void main()

    // Explicitly constant variables can be part of a constant expression

    const int constVar = 5;

    for (int i = 0; i < 5 + constVar; i++) { }

    gl_Position = a_position;

</script>

<script id="fragmentShaderConstVarLoopCondition" type="text/something-not-javascript">

void main()

    // Explicitly constant variables can be part of a constant expression

    const int constVar = 5;

    for (int i = 0; i < constVar + 5; i++) { }

    gl_FragColor = vec4(1.0);

</script>

<script id="vertexShaderNonConstVarLoopCondition" type="text/something-not-javascript">

attribute vec4 a_position;

void main()

    // Despite assigning a constant and not modifying it, nonConstVar is not semantically a constant expression

    int nonConstVar = 10;

    for (int i = 0; i < nonConstVar; i++) { }

    gl_Position = a_position;

</script>

<script id="fragmentShaderNonConstVarLoopCondition" type="text/something-not-javascript">

void main()

    // Despite assigning a constant and not modifying it, nonConstVar is not semantically a constant expression

    int nonConstVar = 10;

    for (int i = 0; i < nonConstVar; i++) { }

    gl_FragColor = vec4(1.0);

</script>

<script>

"use strict";

var wtu = WebGLTestUtils;

var tests = [];

tests.push({

    vShaderSource: wtu.getScript("vertexShaderLiteralLoopCondition"),

    vShaderSuccess: true,

    fShaderSource: wtu.getScript("fragmentShaderLiteralLoopCondition"),

    fShaderSuccess: true,

    linkSuccess: true,

    passMsg: "Shaders with literals in the loop condition should compile and link.",

});

tests.push({

    vShaderSource: wtu.getScript("vertexShaderConstVarLoopCondition"),

    vShaderSuccess: true,

    fShaderSource: wtu.getScript("fragmentShaderConstVarLoopCondition"),

    fShaderSuccess: true,

    linkSuccess: true,

    passMsg: "Shaders with constant variables in the loop condition should compile and link.",

});

tests.push({

    vShaderSource: wtu.getScript("vertexShaderNonConstVarLoopCondition"),

    vShaderSuccess: false,

    fShaderSource: wtu.getScript("fragmentShaderLiteralLoopCondition"),

    fShaderSuccess: true,

    linkSuccess: false,

    passMsg: "Vertex shader with non-const variable in the loop condition should fail.",

});

tests.push({

    vShaderSource: wtu.getScript("vertexShaderLiteralLoopCondition"),

    vShaderSuccess: true,

    fShaderSource: wtu.getScript("fragmentShaderNonConstVarLoopCondition"),

    fShaderSuccess: false,

    linkSuccess: false,

    passMsg: "Fragment shader with non-const variable in the loop condition should fail.",

});

GLSLConformanceTester.runTests(tests);

var successfullyParsed = true;

</script>

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