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#ifndef OSD_GL_DRAW_REGISTRY_H
#define OSD_GL_DRAW_REGISTRY_H

#if defined(__APPLE__)
    #include "TargetConditionals.h"
    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
        #include <OpenGLES/ES2/gl.h>
    #else
        #include <OpenGL/gl3.h>
    #endif
#elif defined(ANDROID)
    #include <GLES2/gl2.h>
#else
    #if defined(_WIN32)
        #include <windows.h>
    #endif
    #include <GL/gl.h>
#endif

#include "../version.h"

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

#include <map>

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

struct OsdGLDrawConfig : public OsdDrawConfig {
    OsdGLDrawConfig() : program(0) {}
    virtual ~OsdGLDrawConfig();

    GLuint program;
};

struct OsdGLDrawSourceConfig : public OsdDrawSourceConfig {
    OsdDrawShaderSource commonShader;
    OsdDrawShaderSource vertexShader;
    OsdDrawShaderSource tessControlShader;
    OsdDrawShaderSource tessEvalShader;
    OsdDrawShaderSource geometryShader;
    OsdDrawShaderSource fragmentShader;
};

////////////////////////////////////////////////////////////

class OsdGLDrawRegistryBase {
public:
    typedef FarPatchTables::Descriptor DescType;
    typedef OsdGLDrawConfig ConfigType;
    typedef OsdGLDrawSourceConfig SourceConfigType;

    virtual ~OsdGLDrawRegistryBase();

protected:
    virtual ConfigType * _NewDrawConfig() { return new ConfigType(); }
    virtual ConfigType *
    _CreateDrawConfig(DescType const & desc,
                      SourceConfigType const * sconfig);

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

template <class DESC_TYPE = FarPatchTables::Descriptor,
          class CONFIG_TYPE = OsdGLDrawConfig,
          class SOURCE_CONFIG_TYPE = OsdGLDrawSourceConfig >
class OsdGLDrawRegistry : public OsdGLDrawRegistryBase {
public:
    typedef OsdGLDrawRegistryBase BaseRegistry;

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

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

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

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

    // fetch shader config
    ConfigType *
    GetDrawConfig(DescType const & desc) {
        typename ConfigMap::iterator it = _configMap.find(desc);
        if (it != _configMap.end()) {
            return it->second;
        } else {
            ConfigType * config =
                _CreateDrawConfig(desc, GetDrawSourceConfig(desc));
            _configMap[desc] = config;
            return config;
        }
    }

    // fetch text and related defines for patch descriptor
    SourceConfigType *
    GetDrawSourceConfig(DescType const & desc) {
        typename SourceConfigMap::iterator it = _sourceConfigMap.find(desc);
        if (it != _sourceConfigMap.end()) {
            return it->second;
        } else {
            SourceConfigType * sconfig = _CreateDrawSourceConfig(desc);
            _sourceConfigMap[desc] = sconfig;
            return sconfig;
        }
    }

protected:
    virtual ConfigType * _NewDrawConfig() { return new ConfigType(); }
    virtual ConfigType *
    _CreateDrawConfig(DescType const & desc,
                      SourceConfigType const * sconfig) { return NULL; }

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

private:
    ConfigMap _configMap;
    SourceConfigMap _sourceConfigMap;
};

} // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

} // end namespace OpenSubdiv

#endif /* OSD_GL_DRAW_REGISTRY_H */