shader-precision-format-obeyed.html

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<title>WebGL GLSL Conformance Tests</title>

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<div id="description"></div>

<div id="console"></div>

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

precision highp float;

uniform vec4 constantColor;

void main()

    gl_FragColor = constantColor;

</script>

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

#ifdef GL_FRAGMENT_PRECISION_HIGH

// Something which compiles

#else

somethingWhichDoesNotCompile();

#endif

void main()

    gl_FragColor = vec4(0, 0, 0, 1);

</script>

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

#ifndef GL_FRAGMENT_PRECISION_HIGH

// Something which compiles

#else

somethingWhichDoesNotCompile();

#endif

void main()

    gl_FragColor = vec4(0, 0, 0, 1);

</script>

<script>

"use strict";

description("Checks that getShaderPrecisionFormat's return value matches whether highp is supported in fragment shaders.");

var wtu = WebGLTestUtils;

var gl = wtu.create3DContext();

var precision = gl.getShaderPrecisionFormat(gl.FRAGMENT_SHADER, gl.HIGH_FLOAT);

var highpSupported = (precision.rangeMin >= 62 && precision.rangeMax >= 62 && precision.precision >= 16);

debug("highp is" + (highpSupported ? "" : " not") + " supported in fragment shaders");

GLSLConformanceTester.runTests([

  fShaderId: 'fshaderWithHighPrecision',

  fShaderSuccess: highpSupported,

  linkSuccess: highpSupported,

  passMsg: "getShaderPrecisionFormat's results agree with highp support in fragment shaders",

},

  fShaderId: highpSupported ? 'fshaderWhichCompilesWithHighp' : 'fshaderWhichCompilesWithoutHighp',

  fShaderSuccess: true,

  linkSuccess: true,

  passMsg: "getShaderPrecisionFormat's results agree with definition of GL_FRAGMENT_PRECISION_HIGH",

},

]);

debug("");

var successfullyParsed = true;

</script>

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