//
//   Copyright 2013 Pixar
//
//   Licensed under the Apache License, Version 2.0 (the "Apache License")
//   with the following modification; you may not use this file except in
//   compliance with the Apache License and the following modification to it:
//   Section 6. Trademarks. is deleted and replaced with:
//
//   6. Trademarks. This License does not grant permission to use the trade
//      names, trademarks, service marks, or product names of the Licensor
//      and its affiliates, except as required to comply with Section 4(c) of
//      the License and to reproduce the content of the NOTICE file.
//
//   You may obtain a copy of the Apache License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the Apache License with the above modification is
//   distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
//   KIND, either express or implied. See the Apache License for the specific
//   language governing permissions and limitations under the Apache License.
//

#ifndef OSD_D3D11_DRAW_REGISTRY_H
#define OSD_D3D11_DRAW_REGISTRY_H

#include "../version.h"

#include "../far/mesh.h"
#include "../osd/drawRegistry.h"
#include "../osd/vertex.h"

#include <map>

struct ID3D11VertexShader;
struct ID3D11HullShader;
struct ID3D11DomainShader;
struct ID3D11GeometryShader;
struct ID3D11PixelShader;

struct ID3D11Buffer;
struct ID3D11ShaderResourceView;
struct ID3D11Device;

struct ID3D11InputLayout;
struct D3D11_INPUT_ELEMENT_DESC;

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

struct OsdD3D11DrawConfig : public OsdDrawConfig {
    OsdD3D11DrawConfig() :
        vertexShader(0), hullShader(0), domainShader(0),
        geometryShader(0), pixelShader(0) {}
    virtual ~OsdD3D11DrawConfig();

    ID3D11VertexShader   *vertexShader;
    ID3D11HullShader     *hullShader;
    ID3D11DomainShader   *domainShader;
    ID3D11GeometryShader *geometryShader;
    ID3D11PixelShader    *pixelShader;
};

//------------------------------------------------------------------------------

struct OsdD3D11DrawSourceConfig {
    OsdDrawShaderSource commonShader;
    OsdDrawShaderSource vertexShader;
    OsdDrawShaderSource hullShader;
    OsdDrawShaderSource domainShader;
    OsdDrawShaderSource geometryShader;
    OsdDrawShaderSource pixelShader;
};


//------------------------------------------------------------------------------

class OsdD3D11DrawRegistryBase {

public:
    typedef OsdDrawContext::PatchDescriptor DescType;
    typedef OsdD3D11DrawConfig ConfigType;
    typedef OsdD3D11DrawSourceConfig SourceConfigType;

    OsdD3D11DrawRegistryBase(bool enablePtex=false) : _enablePtex(enablePtex) { }

    virtual ~OsdD3D11DrawRegistryBase();

    bool IsPtexEnabled() const {
        return _enablePtex;
    }

    void SetPtexEnabled(bool b) {
        _enablePtex=b;
    }

protected:
    virtual ConfigType * _NewDrawConfig() { return new ConfigType(); }
    virtual ConfigType *
    _CreateDrawConfig(DescType const & desc,
                      SourceConfigType const * sconfig,
                      ID3D11Device * pd3dDevice,
                      ID3D11InputLayout ** ppInputLayout,
                      D3D11_INPUT_ELEMENT_DESC const * pInputElementDescs,
                      int numInputElements);

    virtual SourceConfigType * _NewDrawSourceConfig() { return new SourceConfigType(); }
    virtual SourceConfigType *
    _CreateDrawSourceConfig(DescType const & desc, ID3D11Device * pd3dDevice);

private:
    bool _enablePtex;
};

//------------------------------------------------------------------------------

template <class DESC_TYPE = OsdDrawContext::PatchDescriptor,
          class CONFIG_TYPE = OsdD3D11DrawConfig,
          class SOURCE_CONFIG_TYPE = OsdD3D11DrawSourceConfig>
class OsdD3D11DrawRegistry : public OsdD3D11DrawRegistryBase {

public:
    typedef OsdD3D11DrawRegistryBase BaseRegistry;

    typedef DESC_TYPE DescType;
    typedef CONFIG_TYPE ConfigType;
    typedef SOURCE_CONFIG_TYPE SourceConfigType;

    typedef std::map<DescType, ConfigType *> ConfigMap;

public:
    virtual ~OsdD3D11DrawRegistry() {
        Reset();
    }

    void Reset() {
        for (typename ConfigMap::iterator
                i = _configMap.begin(); i != _configMap.end(); ++i) {
            delete i->second;
        }
        _configMap.clear();
    }

    // fetch shader config
    ConfigType *
    GetDrawConfig(DescType const & desc,
                  ID3D11Device * pd3dDevice,
                  ID3D11InputLayout ** ppInputLayout = NULL,
                  D3D11_INPUT_ELEMENT_DESC const * pInputElementDescs = NULL,
                  int numInputElements = 0) {
        typename ConfigMap::iterator it = _configMap.find(desc);
        if (it != _configMap.end()) {
            return it->second;
        } else {
            ConfigType * config =
                _CreateDrawConfig(desc,
                                  _CreateDrawSourceConfig(desc, pd3dDevice),
                                  pd3dDevice,
                                  ppInputLayout,
                                  pInputElementDescs, numInputElements);
            _configMap[desc] = config;
            return config;
        }
    }

protected:
    virtual ConfigType * _NewDrawConfig() {
        return new ConfigType();
    }

    virtual ConfigType * _CreateDrawConfig(DescType const & desc,
                                           SourceConfigType const * sconfig,
                                           ID3D11Device * pd3dDevice,
                                           ID3D11InputLayout ** ppInputLayout,
                                           D3D11_INPUT_ELEMENT_DESC const * pInputElementDescs,
                                           int numInputElements) {
        return NULL;
    }

    virtual SourceConfigType * _NewDrawSourceConfig() {
        return new SourceConfigType();
    }

    virtual SourceConfigType * _CreateDrawSourceConfig(DescType const & desc,
                                                       ID3D11Device * pd3dDevice) {
        return NULL;
    }

private:
    ConfigMap _configMap;
};

} // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

} // end namespace OpenSubdiv

#endif /* OSD_D3D11_DRAW_REGISTRY_H */