/*
 * Adapted from Open Shading Language with this license:
 *
 * Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
 * All Rights Reserved.
 *
 * Modifications Copyright 2011, Blender Foundation.
 * 
 * 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 Sony Pictures Imageworks 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
 * OWNER 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.
 */

#include <OpenImageIO/fmath.h>

#include <OSL/genclosure.h>

#include "osl_closures.h"

CCL_NAMESPACE_BEGIN

using namespace OSL;

/// Generic background closure
///
/// We only have a background closure for the shaders
/// to return a color in background shaders. No methods,
/// only the weight is taking into account
///
class GenericBackgroundClosure : public OSL::BackgroundClosure {
public:
	GenericBackgroundClosure() {}

	void setup() {};
	size_t memsize() const { return sizeof(*this); }
	const char *name() const { return "background"; }
	void print_on(std::ostream &out) const { out << name() << " ()"; }
};

/// Holdout closure
///
/// This will be used by the shader to mark the
/// amount of holdout for the current shading
/// point. No parameters, only the weight will be
/// used
///
class HoldoutClosure : ClosurePrimitive {
public:
	HoldoutClosure () : ClosurePrimitive(Holdout) {}

	void setup() {};
	size_t memsize() const { return sizeof(*this); }
	const char *name() const { return "holdout"; }
	void print_on(std::ostream &out) const { out << name() << " ()"; }
};

/// ambient occlusion closure
///
/// We only have a ambient occlusion closure for the shaders
/// to return a color in ambient occlusion shaders. No methods,
/// only the weight is taking into account
///
class AmbientOcclusionClosure : public ClosurePrimitive {
public:
	AmbientOcclusionClosure () : ClosurePrimitive((ClosurePrimitive::Category)AmbientOcclusion) {}

	void setup() {};
	size_t memsize() const { return sizeof(*this); }
	const char *name() const { return "ambient_occlusion"; }
	void print_on(std::ostream &out) const { out << name() << " ()"; }
};

ClosureParam *closure_background_params()
{
	static ClosureParam params[] = {
	    CLOSURE_STRING_KEYPARAM("label"),
	    CLOSURE_FINISH_PARAM(GenericBackgroundClosure)
	};
	return params;
}

CLOSURE_PREPARE(closure_background_prepare, GenericBackgroundClosure)

ClosureParam *closure_holdout_params()
{
	static ClosureParam params[] = {
	    CLOSURE_FINISH_PARAM(HoldoutClosure)
	};
	return params;
}

CLOSURE_PREPARE(closure_holdout_prepare, HoldoutClosure)

ClosureParam *closure_ambient_occlusion_params()
{
	static ClosureParam params[] = {
	    CLOSURE_STRING_KEYPARAM("label"),
	    CLOSURE_FINISH_PARAM(AmbientOcclusionClosure)
	};
	return params;
}

CLOSURE_PREPARE(closure_ambient_occlusion_prepare, AmbientOcclusionClosure)

CCL_NAMESPACE_END