LayoutTests/webgl/2.0.0/resources/webgl_test_files/conformance/ogles/GL/refract/refract_float_frag_ivarynconst_ref.frag

/*
** Copyright (c) 2012 The Khronos Group Inc.
**
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** copy of this software and/or associated documentation files (the
** "Materials"), to deal in the Materials without restriction, including
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** distribute, sublicense, and/or sell copies of the Materials, and to
** permit persons to whom the Materials are furnished to do so, subject to
** the following conditions:
**
** The above copyright notice and this permission notice shall be included
** in all copies or substantial portions of the Materials.
**
** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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#ifdef GL_ES
precision mediump float;
#endif
varying vec4 color;

void main (void)
{
	// Both are unit vectors
	float v1 = (color.g + 1.0) / 2.0;
	float v2 = (color.b + 1.0) / 2.0;

	float result;
	float eta = 0.5;
	float k = 1.0 - eta * eta * (1.0 - dot(v1, v2) * dot(v1, v2));
	if(k < 0.0)
		result = 0.0;
	else
		result = eta * v1 - (eta * dot(v1, v2) + sqrt(k)) * v2;

	gl_FragColor = vec4((result + 1.0) / 2.0, 0.0, 0.0, 1.0);
}