// Aqsis
// Copyright (C) 2001, Paul C. Gregory and the other authors and contributors
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
// * Neither the name of the software's owners nor the names of its
//   contributors may be used to endorse or promote products derived from this
//   software without specific prior written permission.
//
// 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
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// (This is the New BSD license)

/** \file
 *
 * \brief Dummy texture sampler for missing files
 *
 * \author Chris Foster [ chris42f (at) gmail (dot) com ]
 */

#include "dummytexturesampler.h"

namespace Aqsis {

void CqDummyTextureSampler::sample(const SqSamplePllgram& samplePllgram,
	const CqTextureSampleOptions& sampleOpts, TqFloat* outSamps) const
{
	SqSamplePllgram pllgram = samplePllgram;
	pllgram.remapPeriodic(true, true);

	// Make an ugly unfiltered black-on-white cross shape to indicate that the
	// texture isn't present.
	TqFloat x = pllgram.c.x();
	TqFloat y = pllgram.c.y();
	const TqFloat crossWidth = 0.10;
	const TqFloat borderWidth = 0.05;
	TqFloat result = 1;
	if((x < borderWidth || y < borderWidth) && y < 1-x)
	{
		result = 0.3;
	}
	else if((x > 1 - borderWidth || y > 1 - borderWidth) && y >= 1-x)
	{
		result = 0.7;
	}
	else if( (y < x + crossWidth && y > x - crossWidth)
		|| (y < 1 + crossWidth - x && y > 1 - crossWidth - x) )
	{
		result = 0;
	}

	// Scatter result into output channels.
	for(int i = 0; i < sampleOpts.numChannels(); ++i)
	{
		outSamps[i] = result;
	}
}


} // namespace Aqsis
