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transferfunction.frag 3.52 KB
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// ================================================================================================
// 
// This file is part of the TUMVis Visualization Framework.
// 
// If not explicitly stated otherwise: Copyright (C) 2012, all rights reserved,
//      Christian Schulte zu Berge (christian.szb@in.tum.de)
//      Chair for Computer Aided Medical Procedures
//      Technische Universität München
//      Boltzmannstr. 3, 85748 Garching b. München, Germany
// 
// The licensing of this softare is not yet resolved. Until then, redistribution in source or
// binary forms outside the CAMP chair is not permitted, unless explicitly stated in legal form.
// However, the names of the original authors and the above copyright notice must retain in its
// original state in any case.
// 
// Legal disclaimer provided by the BSD license:
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 
// AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
// 
// ================================================================================================

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struct TFParameters {
    vec2 _intensityDomain;
};

/**
 * Linearly maps the image intensity \a intensity to the domain of the transfer function as defined in the TF parameters \a p.
 * \param	p			Transfer function parameters struct
 * \param	intensity	Image intensity (normalized to [0, 1])
 * \return	Intensity mapped to transfer function domain.
 */
float mapIntensityToTFDomain(in TFParameters p, in float intensity) {
    if(intensity <= p._intensityDomain.x)
       return 0.0;
    else if(intensity >= p._intensityDomain.y)
       return 1.0;
    else
        return (intensity - p._intensityDomain.x) / (p._intensityDomain.y - p._intensityDomain.x);
}

/**
 * Performs a 1D transfer function lookup for the given TF and intensity.
 * Before lookup \a intensity will be mapped to the TF domain.
 * \param	p			Transfer function parameters struct
 * \param	tex			Transfer function texture
 * \param	intensity	Image intensity (normalized to [0, 1])
 * \return	The color of the transfer function at the given intensity.
 */
vec4 lookupTF(in TFParameters p, in sampler1D tex, in float intensity) {
    intensity = mapIntensityToTFDomain(p, intensity);
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    return texture(tex, intensity);
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}

/**
 * Performs a 2D transfer function lookup for the given TF, intensity and y-value.
 * Before lookup \a intensity will be mapped to the TF domain.
 * \param	p			Transfer function parameters struct
 * \param	tex			Transfer function texture
 * \param	intensity	Image intensity (normalized to [0, 1])
 * \param	y			y-value for lookup
 * \return	The color of the transfer function at the given intensity and y-value.
 */
vec4 lookupTF(in TFParameters p, in sampler2D tex, in float intensity, in float y) {
    intensity = mapIntensityToTFDomain(p, intensity);
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    return texture(tex, vec2(intensity, y));
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}