/*
Copyright (c) 2003-2010 Sony Pictures Imageworks Inc., et al.
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 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.
*/


#ifndef INCLUDED_OCIO_OP_H
#define INCLUDED_OCIO_OP_H

#include <OpenColorIO/OpenColorIO.h>

#include <sstream>
#include <vector>

OCIO_NAMESPACE_ENTER
{
    struct AllocationData
    {
        Allocation allocation;
        std::vector<float> vars;
        
        AllocationData():
            allocation(ALLOCATION_UNIFORM)
            {};
        
        std::string getCacheID() const;
    };
    
    std::ostream& operator<< (std::ostream&, const AllocationData&);
    
    class Op;
    typedef OCIO_SHARED_PTR<Op> OpRcPtr;
    typedef std::vector<OpRcPtr> OpRcPtrVec;
    
    std::string SerializeOpVec(const OpRcPtrVec & ops, int indent=0);
    bool IsOpVecNoOp(const OpRcPtrVec & ops);
    
    void FinalizeOpVec(OpRcPtrVec & opVec, bool optimize=true);
    
    void OptimizeOpVec(OpRcPtrVec & result);
    
    class Op
    {
        public:
            virtual ~Op();
            
            virtual OpRcPtr clone() const = 0;
            
            //! Something short, and printable.
            //  The type of stuff you'd want to see in debugging.
            virtual std::string getInfo() const = 0;
            
            //! This should yield a string of not unreasonable length.
            //! It can only be called after finalize()
            virtual std::string getCacheID() const = 0;
            
            //! Is the processing a noop? I.e, does apply do nothing.
            //! (Even no-ops may define Allocation though.)
            //! This must be implmented in a manner where its valid to call
            //! *prior* to finalize. (Optimizers may make use of it)
            virtual bool isNoOp() const = 0;
            
            virtual bool isSameType(const OpRcPtr & op) const = 0;
            
            virtual bool isInverse(const OpRcPtr & op) const = 0;
            
            virtual bool canCombineWith(const OpRcPtr & op) const;
            
            // Return a vector of result ops, which correspond to
            // THIS combinedWith secondOp.
            //
            // If the result is a noOp, it is valid for the resulting opsVec
            // to be empty.
            
            virtual void combineWith(OpRcPtrVec & ops, const OpRcPtr & secondOp) const;
            
            virtual bool hasChannelCrosstalk() const = 0;
            
            virtual void dumpMetadata(ProcessorMetadataRcPtr & /*metadata*/) const
            { }
            
            // This is called a single time after construction.
            // Final pre-processing and safety checks should happen here,
            // rather than in the constructor.
            
            virtual void finalize() = 0;
            
            // Render the specified pixels.
            //
            // This must be safe to call in a multi-threaded context.
            // Ops that have mutable data internally, or rely on external
            // caching, must thus be appropriately mutexed.
            
            virtual void apply(float* rgbaBuffer, long numPixels) const = 0;
            
            
            //! Does this op support gpu shader text generation
            virtual bool supportsGpuShader() const = 0;
            
            // TODO: If temp variables are ever needed, also pass tempvar prefix.
            virtual void writeGpuShader(std::ostream & shader,
                                        const std::string & pixelName,
                                        const GpuShaderDesc & shaderDesc) const = 0;
            
        private:
            Op& operator= (const Op &);
    };
    
    std::ostream& operator<< (std::ostream&, const Op&);
}
OCIO_NAMESPACE_EXIT

#endif