// blah

#include "polymer.h"

_prsector*      prsectors[MAXSECTORS];

float           polymostprojmatrix[16];
float           polymostmodelmatrix[16];

// tesselation variables
GLUtesselator*  prtess;
int             tempverticescount;
GLdouble        tempvertice[3];

// Polymer cvars
char    pr_verbosity = 1; // 0: silent, 1: errors and one-times, 2: multiple-times, 3: flood
char    pr_wireframe = 0;

int     polymer_init(void)
{
    int i;

    if (pr_verbosity >= 1) OSD_Printf("Initalizing Polymer subsystem...\n");

    i = 0;
    while (i < MAXSECTORS)
    {
        prsectors[i] = NULL;
        i++;
    }

    prtess = gluNewTess();
    if (prtess == 0)
    {
        if (pr_verbosity >= 1) OSD_Printf("PR : Tesselator initialization failed.\n");
        return (0);
    }

    if (pr_verbosity >= 1) OSD_Printf("PR : Initialization complete.\n");
    return (1);
}

void            polymer_glinit(void)
{
    GLfloat     params[4];

    bglGetFloatv(GL_PROJECTION_MATRIX, polymostprojmatrix);
    bglGetFloatv(GL_MODELVIEW_MATRIX, polymostmodelmatrix);
    bglClearColor(0.0f, 0.0f, 0.0f, 1.0f);
    bglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    bglViewport(0, 0, 1024, 768);

    // texturing
    bglDisable(GL_TEXTURE_2D);
    //bglEnable(GL_TEXTURE_GEN_S);
    //bglEnable(GL_TEXTURE_GEN_T);
    params[0] = GL_OBJECT_LINEAR;
    bglTexGenfv(GL_S, GL_TEXTURE_GEN_MODE, params);
    bglTexGenfv(GL_T, GL_TEXTURE_GEN_MODE, params);
    params[0] = 1.0 / 10000.0;
    params[1] = 1.0 / 10000.0;
    params[2] = 1.0 / 10000.0;
    params[3] = 1.0 / 10000.0;
    bglTexGenfv(GL_S, GL_OBJECT_PLANE, params);
    bglTexGenfv(GL_T, GL_OBJECT_PLANE, params);

    bglDisable(GL_FOG);
    bglEnable(GL_DEPTH_TEST);
    if (pr_wireframe)
        bglPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
    else
        bglPolygonMode(GL_FRONT_AND_BACK, GL_FILL);

    bglMatrixMode(GL_PROJECTION);
    bglLoadIdentity();
    bglFrustum(-1.0f, 1.0f, -0.75f, 0.75, 1.0f, 1000000.0f);
    bglMatrixMode(GL_MODELVIEW);
    bglLoadIdentity();
}

int             polymer_updategeometry(short sectnum)
{
    _prsector*  s;
    sectortype  *sec;
    walltype    *wal;
    int         i, ret;
    long        ceilz, florz;

    s = prsectors[sectnum];
    sec = &sector[sectnum];
    wal = &wall[sec->wallptr];

    if (s == NULL)
    {
        if (pr_verbosity >= 1) OSD_Printf("PR : Can't update uninitialized sector %i.\n", sectnum);
        return (-1);
    }

    if (sec->wallnum != s->wallcount)
    {
        s->wallcount = sec->wallnum;
        s->verts = realloc(s->verts, sizeof(_prvertex) * s->wallcount);
        memset(s->verts, 0, sizeof(_prvertex) * s->wallcount);
        ret = 1;
    }
    else
        ret = 0;

    

    i = 0;
    while (i < s->wallcount)
    {
        s->verts[i].wallnum = sec->wallptr + i;
        s->verts[i].v[2] = -wal->x;
        s->verts[i].v[0] = wal->y;
        getzsofslope(sectnum, wal->x, wal->y, &ceilz, &florz);
        s->verts[i].v[1] = -florz;

        i++;
        wal = &wall[sec->wallptr + i];
    }

    if (pr_verbosity >= 3) OSD_Printf("PR : Updated sector %i.\n", sectnum);

    return (ret);
}

// This callback is called by the tesselator when it detects an intersection between contours (HELLO ROTATING SPOTLIGHT IN E1L1).
void PR_CALLBACK    polymer_tesscombine(GLdouble v[3], GLdouble *data[4], GLfloat weight[4], GLdouble **out)
{
    GLdouble*       ptr;

    //tempverticescount++;
    //tempvertices = realloc(tempvertices, tempverticescount * sizeof(GLdouble) * 3);
    tempvertice[0] = v[0];
    tempvertice[1] = v[1];
    tempvertice[2] = v[2];

    ptr = tempvertice;
    *out = ptr;

    if (pr_verbosity >= 2) OSD_Printf("PR : Created additional geometry for sector tesselation.\n");
}

// This callback is called by the tesselator whenever it raises an error.
void PR_CALLBACK    polymer_tesserror(GLenum error)
{
    if (pr_verbosity >= 1) OSD_Printf("PR : Tesselation error number %i reported : %s.\n", error, gluErrorString(errno));
}

// This function tesselates the floor/ceiling of a sector and stores the triangles in a display list.
int             polymer_buildfloor(short sectnum)
{
    _prsector*  s;
    sectortype  *sec;
    int         i;

    if (pr_verbosity >= 2) OSD_Printf("PR : Tesselating floor of sector %i...\n", sectnum);

    s = prsectors[sectnum];
    sec = &sector[sectnum];

    if (s == NULL)
        return (-1);

    bglNewList(sectnum + 1, GL_COMPILE);

    gluTessCallback(prtess, GLU_TESS_BEGIN, bglBegin);
    gluTessCallback(prtess, GLU_TESS_VERTEX, bglVertex3dv);
    gluTessCallback(prtess, GLU_TESS_END, bglEnd);
    gluTessCallback(prtess, GLU_TESS_COMBINE, polymer_tesscombine);
    gluTessCallback(prtess, GLU_TESS_ERROR, polymer_tesserror);

    gluTessProperty(prtess, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_POSITIVE);

    //tempverticescount = 0;
    //tempvertice = NULL;

    gluTessBeginPolygon(prtess, NULL);
    gluTessBeginContour(prtess);

    i = 0;
    while (i < sec->wallnum)
    {
        gluTessVertex(prtess, s->verts[i].v, s->verts[i].v);
        if ((i != (sec->wallnum - 1)) && (s->verts[i].wallnum > wall[s->verts[i].wallnum].point2))
        {
            gluTessEndContour(prtess);
            gluTessBeginContour(prtess);
        }
        i++;
    }
    gluTessEndContour(prtess);
    gluTessEndPolygon(prtess);

    bglEndList();

    /*if (tempverticescount)
    {
        free(tempvertices);
        tempvertices = NULL;
        tempverticescount = 0;
    }*/

    if (pr_verbosity >= 2) OSD_Printf("PR : Tesselated floor of sector %i.\n", sectnum);

    return (1);
}

int             polymer_initsector(short sectnum)
{
    sectortype  *sec;
    _prsector*  s;

    if (pr_verbosity >= 2) OSD_Printf("PR : Initalizing sector %i...\n", sectnum);

    sec = &sector[sectnum];
    s = malloc(sizeof(_prsector));
    if (s == NULL)
    {
        if (pr_verbosity >= 1) OSD_Printf("PR : Cannot initialize sector %i : malloc failed.\n", sectnum);
        return (0);
    }

    s->invalidate = 0;
    s->wallcount = sec->wallnum;
    s->verts = malloc(s->wallcount * sizeof(_prvertex));
    if (s->verts == NULL)
    {
        if (pr_verbosity >= 1) OSD_Printf("PR : Cannot initialize geometry of sector %i : malloc failed.\n", sectnum);
        return (0);
    }

    prsectors[sectnum] = s;

    if (pr_verbosity >= 2) OSD_Printf("PR : Initalized sector %i.\n", sectnum);

    return (1);
}

void            polymer_drawsector(long daposx, long daposy, long daposz, short daang, long dahoriz, short sectnum)
{
    sectortype  *sec, *nextsec;
    walltype    *wal;
    _prsector*  s;
    float       ang;
    double      pos[3];
    int         i;
    long        zdiff;
    pthtyp*     pth;

    if (pr_verbosity >= 3) OSD_Printf("PR : Drawing sector %i...\n", sectnum);

    if (prsectors[sectnum] == NULL)
    {
        polymer_initsector(sectnum);
        polymer_updategeometry(sectnum);
        polymer_buildfloor(sectnum);
    }
    else if ((prsectors[sectnum]->invalidate) || 1)
    {
        if (pr_verbosity >= 2) OSD_Printf("PR : Sector %i invalidated. Tesselating...\n", sectnum);
        polymer_updategeometry(sectnum);
        polymer_buildfloor(sectnum);
        if (prsectors[sectnum]->invalidate)
            prsectors[sectnum]->invalidate = 0;
    }

    sec = &sector[sectnum];
    wal = &wall[sec->wallptr];
    s = prsectors[sectnum];

    ang = (float)(daang) / (2048.0f / 360.0f);

    pos[0] = -daposy;
    pos[1] = daposz;
    pos[2] = daposx;

    bglMatrixMode(GL_MODELVIEW);
    bglLoadIdentity();
    bglRotatef(ang, 0.0f, 1.0f, 0.0f);
    bglScalef(1.0f, 1.0f / 16.0f, 1.0f);
    bglTranslatef(pos[0], pos[1], pos[2]);

    // floor
    pth = gltexcache(sec->floorpicnum,sec->floorpal,0);
    bglBindTexture(GL_TEXTURE_2D, pth ? pth->glpic : 0);
    bglColor4f(1.0f, 1.0f, 1.0f, 1.0f);
    bglCallList(sectnum + 1); // DONT FORGET THE +1 DAMMIT

    // ceiling
    pth = gltexcache(sec->ceilingpicnum,sec->ceilingpal,0);
    bglBindTexture(GL_TEXTURE_2D, pth ? pth->glpic : 0);
    bglColor4f(1.0f, 0.0f, 0.0f, 1.0f);
    bglPushMatrix();
    bglTranslatef(0.0f, sec->floorz - sec->ceilingz, 0.0f);
    bglCallList(sectnum + 1);
    bglPopMatrix();

    // walls
    i = 0;
    while (i < sec->wallnum)
    {
        if (wal->nextsector == -1)
        { // limit of the map
            pth = gltexcache(wal->picnum,wal->pal,0);
            bglBindTexture(GL_TEXTURE_2D, pth ? pth->glpic : 0);
            bglColor4f(0.0f, 1.0f, 0.0f, 1.0f);
            bglBegin(GL_QUADS);
            bglVertex3d(s->verts[i].v[0], s->verts[i].v[1], s->verts[i].v[2]);
            bglVertex3d(s->verts[wal->point2 - sec->wallptr].v[0], s->verts[wal->point2 - sec->wallptr].v[1], s->verts[wal->point2 - sec->wallptr].v[2]);
            bglVertex3d(s->verts[wal->point2 - sec->wallptr].v[0], s->verts[wal->point2 - sec->wallptr].v[1] + (sec->floorz - sec->ceilingz), s->verts[wal->point2 - sec->wallptr].v[2]);
            bglVertex3d(s->verts[i].v[0], s->verts[i].v[1] + (sec->floorz - sec->ceilingz), s->verts[i].v[2]);
            bglEnd();
        }
        else
        {
            nextsec = &sector[wal->nextsector];
            zdiff = sec->floorz - nextsec->floorz;
            if (zdiff > 0)
            { // floor polymerization
                pth = gltexcache(wal->picnum,wal->pal,0);
                bglBindTexture(GL_TEXTURE_2D, pth ? pth->glpic : 0);
                bglColor4f(0.0f, 0.0f, 1.0f, 1.0f);
                bglBegin(GL_QUADS);
                bglVertex3d(s->verts[i].v[0], s->verts[i].v[1], s->verts[i].v[2]);
                bglVertex3d(s->verts[wal->point2 - sec->wallptr].v[0], s->verts[wal->point2 - sec->wallptr].v[1], s->verts[wal->point2 - sec->wallptr].v[2]);
                bglVertex3d(s->verts[wal->point2 - sec->wallptr].v[0], s->verts[wal->point2 - sec->wallptr].v[1] + zdiff, s->verts[wal->point2 - sec->wallptr].v[2]);
                bglVertex3d(s->verts[i].v[0], s->verts[i].v[1] + zdiff, s->verts[i].v[2]);
                bglEnd();
            }
            zdiff = sec->ceilingz - nextsec->ceilingz;
            if (zdiff > 0)
            { // ceiling polymerization
                pth = gltexcache(wal->picnum,wal->pal,0);
                bglBindTexture(GL_TEXTURE_2D, pth ? pth->glpic : 0);
                bglColor4f(1.0f, 0.0f, 1.0f, 1.0f);
                bglBegin(GL_QUADS);
                bglVertex3d(s->verts[i].v[0], s->verts[i].v[1] + (sec->floorz - sec->ceilingz), s->verts[i].v[2]);
                bglVertex3d(s->verts[wal->point2 - sec->wallptr].v[0], s->verts[wal->point2 - sec->wallptr].v[1] + (sec->floorz - sec->ceilingz), s->verts[wal->point2 - sec->wallptr].v[2]);
                bglVertex3d(s->verts[wal->point2 - sec->wallptr].v[0], s->verts[wal->point2 - sec->wallptr].v[1] + zdiff + (sec->floorz - sec->ceilingz), s->verts[wal->point2 - sec->wallptr].v[2]);
                bglVertex3d(s->verts[i].v[0], s->verts[i].v[1] + zdiff + (sec->floorz - sec->ceilingz), s->verts[i].v[2]);
                bglEnd();
            }
        }


        i++;
        wal = &wall[sec->wallptr + i];
    }

    if (pr_verbosity >= 3) OSD_Printf("PR : Finished drawing sector %i...\n", sectnum);
}

void    polymer_drawrooms(long daposx, long daposy, long daposz, short daang, long dahoriz, short dacursectnum)
{
    int i;

    if (pr_verbosity >= 3) OSD_Printf("PR : Drawing rooms...\n");

    polymer_glinit();

    i = 0;
    while (i < numsectors)
    {
        polymer_drawsector(daposx, daposy, daposz, daang, dahoriz, i);
        i++;
    }

    bglMatrixMode(GL_PROJECTION);
    bglLoadMatrixf(polymostprojmatrix);
    bglMatrixMode(GL_MODELVIEW);
    bglLoadMatrixf(polymostmodelmatrix);

    if (pr_verbosity >= 3) OSD_Printf("PR : Rooms drawn.\n");
}