texture2d.frag 2.99 KB
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// ================================================================================================
// 
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// This file is part of the CAMPVis Software Framework.
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// 
// If not explicitly stated otherwise: Copyright (C) 2012, all rights reserved,
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//      Christian Schulte zu Berge <christian.szb@in.tum.de>
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//      Chair for Computer Aided Medical Procedures
//      Technische Universität München
//      Boltzmannstr. 3, 85748 Garching b. München, Germany
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// For a full list of authors and contributors, please refer to the file "AUTHORS.txt".
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// 
// 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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// TODO: implement coordinate transformation using a trafo matrix?

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struct Texture2D {
    sampler2D _texture;
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    vec2 _size;
    vec2 _sizeRCP;
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    int _numChannels;
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};

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/**
 * Texture lookup function for 2D textures using pixel coordinates, i.e [(0,0) , textureSize].
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 * \param	tex			Texture2D struct with texture for lookup
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 * \param	texCoords	Lookup coordinates in pixel coordinates
 * \return	The texel at the given coordinates.
 */
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vec4 getElement2D(in Texture2D tex, in vec2 texCoords) {
    vec2 texCoordsNormalized = texCoords * tex._sizeRCP;
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    //vec2 texCoordsTransformed = (texParams.matrix_ * vec4(texCoordsNormalized, 0.0, 1.0)).xy;
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    return texture(tex._texture, texCoordsNormalized);
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}

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/**
 * Texture lookup function for 2D textures using normalized texture coordinates, i.e. [0,1].
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 * \param	tex			Texture2D struct with texture for lookup
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 * \param	texCoords	Lookup coordinates in normlized texture coordinates
 * \return	The texel at the given coordinates.
 */
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vec4 getElement2DNormalized(in Texture2D tex, in vec2 texCoords) {
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    //vec2 texCoordsTransformed = (texParams.matrix_ * vec4(texCoords, 0.0, 1.0)).xy;
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    return texture(tex._texture, texCoords);
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}