#ifndef SHARED_GLEMU_HH
#define SHARED_GLEMU_HH

#include "glexts.hh"
#include "geom.hh"
#include "tools.hh"

namespace gle
{
    enum
    {
        ATTRIB_VERTEX       = 0,
        ATTRIB_COLOR        = 1,
        ATTRIB_TEXCOORD0    = 2,
        ATTRIB_TEXCOORD1    = 3,
        ATTRIB_NORMAL       = 4,
        ATTRIB_TANGENT      = 5,
        ATTRIB_BONEWEIGHT   = 6,
        ATTRIB_BONEINDEX    = 7,
        MAXATTRIBS          = 8
    };

    extern const char * const attribnames[MAXATTRIBS];
    extern ucharbuf attribbuf;

    extern int enabled;
    extern void forcedisable();
    static inline void disable() { if(enabled) forcedisable(); }

    extern void begin(GLenum mode);
    extern void begin(GLenum mode, int numverts);
    extern void defattribs(const char *fmt);
    extern void defattrib(int type, int size, int format);

    #define GLE_DEFATTRIB(name, type, defaultsize, defaultformat) \
        static inline void def##name(int size = defaultsize, int format = defaultformat) { defattrib(type, size, format); }

    GLE_DEFATTRIB(vertex, ATTRIB_VERTEX, 3, GL_FLOAT)
    GLE_DEFATTRIB(color, ATTRIB_COLOR, 3, GL_FLOAT)
    GLE_DEFATTRIB(texcoord0, ATTRIB_TEXCOORD0, 2, GL_FLOAT)
    GLE_DEFATTRIB(texcoord1, ATTRIB_TEXCOORD1, 2, GL_FLOAT)
    GLE_DEFATTRIB(normal, ATTRIB_NORMAL, 3, GL_FLOAT)
    GLE_DEFATTRIB(tangent, ATTRIB_TANGENT, 4, GL_FLOAT)
    GLE_DEFATTRIB(boneweight, ATTRIB_BONEWEIGHT, 4, GL_UNSIGNED_BYTE)
    GLE_DEFATTRIB(boneindex, ATTRIB_BONEINDEX, 4, GL_UNSIGNED_BYTE)

    #define GLE_INITATTRIB(name, index, suffix, type) \
        static inline void name##suffix(type x) { glVertexAttrib1##suffix##_(index, x); } \
        static inline void name##suffix(type x, type y) { glVertexAttrib2##suffix##_(index, x, y); } \
        static inline void name##suffix(type x, type y, type z) { glVertexAttrib3##suffix##_(index, x, y, z); } \
        static inline void name##suffix(type x, type y, type z, type w) { glVertexAttrib4##suffix##_(index, x, y, z, w); }
    #define GLE_INITATTRIBF(name, index) \
        GLE_INITATTRIB(name, index, f, float) \
        static inline void name(const vec &v) { glVertexAttrib3fv_(index, v.v); } \
        static inline void name(const vec &v, float w) { glVertexAttrib4f_(index, v.x, v.y, v.z, w); } \
        static inline void name(const vec2 &v) { glVertexAttrib2fv_(index, v.v); } \
        static inline void name(const vec4 &v) { glVertexAttrib4fv_(index, v.v); }
    #define GLE_INITATTRIBN(name, index, suffix, type, defaultw) \
        static inline void name##suffix(type x, type y, type z, type w = defaultw) { glVertexAttrib4N##suffix##_(index, x, y, z, w); }

    GLE_INITATTRIBF(vertex, ATTRIB_VERTEX)
    GLE_INITATTRIBF(color, ATTRIB_COLOR)
    GLE_INITATTRIBN(color, ATTRIB_COLOR, ub, uchar, 255)
    static inline void color(const bvec &v, uchar alpha = 255) { glVertexAttrib4Nub_(ATTRIB_COLOR, v.x, v.y, v.z, alpha); }
    static inline void color(const bvec4 &v) { glVertexAttrib4Nubv_(ATTRIB_COLOR, v.v); }
    GLE_INITATTRIBF(texcoord0, ATTRIB_TEXCOORD0)
    GLE_INITATTRIBF(texcoord1, ATTRIB_TEXCOORD1)
    static inline void normal(float x, float y, float z) { glVertexAttrib4f_(ATTRIB_NORMAL, x, y, z, 0.0f); }
    static inline void normal(const vec &v) { glVertexAttrib4f_(ATTRIB_NORMAL, v.x, v.y, v.z, 0.0f); }
    static inline void tangent(float x, float y, float z, float w = 1.0f) { glVertexAttrib4f_(ATTRIB_TANGENT, x, y, z, w); }
    static inline void tangent(const vec &v, float w = 1.0f) { glVertexAttrib4f_(ATTRIB_TANGENT, v.x, v.y, v.z, w); }
    static inline void tangent(const vec4 &v) { glVertexAttrib4fv_(ATTRIB_TANGENT, v.v); }

    #define GLE_ATTRIBPOINTER(name, index, defaultnormalized, defaultsize, defaulttype, prepare) \
        static inline void enable##name() { prepare; glEnableVertexAttribArray_(index); } \
        static inline void disable##name() { glDisableVertexAttribArray_(index); } \
        static inline void name##pointer(int stride, const void *data, GLenum type = defaulttype, int size = defaultsize, GLenum normalized = defaultnormalized) { \
            prepare; \
            glVertexAttribPointer_(index, size, type, normalized, stride, data); \
        }

    static inline void enableattrib(int index) { disable(); glEnableVertexAttribArray_(index); }
    static inline void disableattrib(int index) { glDisableVertexAttribArray_(index); }
    GLE_ATTRIBPOINTER(vertex, ATTRIB_VERTEX, GL_FALSE, 3, GL_FLOAT, disable())
    GLE_ATTRIBPOINTER(color, ATTRIB_COLOR, GL_TRUE, 4, GL_UNSIGNED_BYTE, )
    GLE_ATTRIBPOINTER(texcoord0, ATTRIB_TEXCOORD0, GL_FALSE, 2, GL_FLOAT, )
    GLE_ATTRIBPOINTER(texcoord1, ATTRIB_TEXCOORD1, GL_FALSE, 2, GL_FLOAT, )
    GLE_ATTRIBPOINTER(normal, ATTRIB_NORMAL, GL_TRUE, 3, GL_FLOAT, )
    GLE_ATTRIBPOINTER(tangent, ATTRIB_TANGENT, GL_TRUE, 4, GL_FLOAT, )
    GLE_ATTRIBPOINTER(boneweight, ATTRIB_BONEWEIGHT, GL_TRUE, 4, GL_UNSIGNED_BYTE, )
    GLE_ATTRIBPOINTER(boneindex, ATTRIB_BONEINDEX, GL_FALSE, 4, GL_UNSIGNED_BYTE, )

    static inline void bindebo(GLuint ebo) { disable(); glBindBuffer_(GL_ELEMENT_ARRAY_BUFFER, ebo); }
    static inline void clearebo() { glBindBuffer_(GL_ELEMENT_ARRAY_BUFFER, 0); }
    static inline void bindvbo(GLuint vbo) { disable(); glBindBuffer_(GL_ARRAY_BUFFER, vbo); }
    static inline void clearvbo() { glBindBuffer_(GL_ARRAY_BUFFER, 0); }

    template<class T>
    static inline void attrib(T x)
    {
        if(attribbuf.check(sizeof(T)))
        {
            T *buf = (T *)attribbuf.pad(sizeof(T));
            buf[0] = x;
        }
    }

    template<class T>
    static inline void attrib(T x, T y)
    {
        if(attribbuf.check(2*sizeof(T)))
        {
            T *buf = (T *)attribbuf.pad(2*sizeof(T));
            buf[0] = x;
            buf[1] = y;
        }
    }

    template<class T>
    static inline void attrib(T x, T y, T z)
    {
        if(attribbuf.check(3*sizeof(T)))
        {
            T *buf = (T *)attribbuf.pad(3*sizeof(T));
            buf[0] = x;
            buf[1] = y;
            buf[2] = z;
        }
    }

    template<class T>
    static inline void attrib(T x, T y, T z, T w)
    {
        if(attribbuf.check(4*sizeof(T)))
        {
            T *buf = (T *)attribbuf.pad(4*sizeof(T));
            buf[0] = x;
            buf[1] = y;
            buf[2] = z;
            buf[3] = w;
        }
    }

    template<size_t N, class T>
    static inline void attribv(const T *v)
    {
        attribbuf.put((const uchar *)v, N*sizeof(T));
    }

    #define GLE_ATTRIB(suffix, type) \
        static inline void attrib##suffix(type x) { attrib<type>(x); } \
        static inline void attrib##suffix(type x, type y) { attrib<type>(x, y); } \
        static inline void attrib##suffix(type x, type y, type z) { attrib<type>(x, y, z); } \
        static inline void attrib##suffix(type x, type y, type z, type w) { attrib<type>(x, y, z, w); }

    GLE_ATTRIB(f, float)
    GLE_ATTRIB(d, double)
    GLE_ATTRIB(b, char)
    GLE_ATTRIB(ub, uchar)
    GLE_ATTRIB(s, short)
    GLE_ATTRIB(us, ushort)
    GLE_ATTRIB(i, int)
    GLE_ATTRIB(ui, uint)

    static inline void attrib(const vec &v) { attribf(v.x, v.y, v.z); }
    static inline void attrib(const vec &v, float w) { attribf(v.x, v.y, v.z, w); }
    static inline void attrib(const vec2 &v) { attribf(v.x, v.y); }
    static inline void attrib(const vec4 &v) { attribf(v.x, v.y, v.z, v.w); }
    static inline void attrib(const ivec &v) { attribi(v.x, v.y, v.z); }
    static inline void attrib(const ivec &v, int w) { attribi(v.x, v.y, v.z, w); }
    static inline void attrib(const ivec2 &v) { attribi(v.x, v.y); }
    static inline void attrib(const ivec4 &v) { attribi(v.x, v.y, v.z, v.w); }
    static inline void attrib(const bvec &b) { attribub(b.x, b.y, b.z); }
    static inline void attrib(const bvec &b, uchar w) { attribub(b.x, b.y, b.z, w); }
    static inline void attrib(const bvec4 &b) { attribub(b.x, b.y, b.z, b.w); }

    extern void multidraw();
    extern int end();

    extern void enablequads();
    extern void disablequads();
    extern void drawquads(int offset, int count);

    extern void setup();
    extern void cleanup();
}

#endif /* SHARED_GLEMU_HH */