GS2.c

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#include <stdlib.h>
#include <string.h>
#include <math.h>

#include <grass/config.h>

#if defined(OPENGL_X11) || defined(OPENGL_WINDOWS)
#include <GL/gl.h>
#include <GL/glu.h>
#elif defined(OPENGL_AQUA)
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#endif

#include <grass/gis.h>
#include <grass/gstypes.h>
#include <grass/glocale.h>

#include "gsget.h"
#include "rowcol.h"
#include "rgbpack.h"

/* Hack to make NVIZ2.2 query functions.("What's Here" and "Look at")
 * to work.
 * Uses gs_los_intersect1() instead of gs_los_intersect().
 * Pierre de Mouveaux - 31 oct. 1999. p_de_mouveaux@hotmail.com.
 */
#define NVIZ_HACK 1

int gsd_getViewport(GLint *, GLint *);

/* array of surface ids */
static int Surf_ID[MAX_SURFS];
static int Next_surf = 0;
static int SDref_surf = 0;

/* attributes array */
static float Default_const[MAX_ATTS];
static float Default_nulls[MAX_ATTS];

/* largest dimension */
static float Longdim;

/* N, S, W, E */
static float Region[4];
static geoview Gv;
static geodisplay Gd;
static struct Cell_head wind;
static int Buffermode;
static int Numlights = 0;
static int Resetlight = 1;
static int Modelshowing = 0;

void void_func(void)
{
    return;
}

void GS_libinit(void)
{
    static int first = 1;

    G_get_set_window(&wind);

    Region[0] = wind.north;
    Region[1] = wind.south;
    Region[2] = wind.west;
    Region[3] = wind.east;

    /* scale largest dimension to GS_UNIT_SIZE */
    if ((wind.east - wind.west) > (wind.north - wind.south)) {
        Longdim = (wind.east - wind.west);
    }
    else {
        Longdim = (wind.north - wind.south);
    }

    Gv.scale = GS_UNIT_SIZE / Longdim;

    G_debug(1, "GS_libinit(): n=%f s=%f w=%f e=%f scale=%f first=%d",
            Region[0], Region[1], Region[2], Region[3], Gv.scale, first);
    
    Cxl_func = void_func;
    Swap_func = void_func;

    
    if (first) {
        gs_init();
    }

    first = 0;

    return;
}

int GS_get_longdim(float *dim)
{
    *dim = Longdim;

    G_debug(3, "GS_get_longdim(): dim=%g", *dim);

    return (1);
}

int GS_get_region(float *n, float *s, float *w, float *e)
{
    *n = Region[0];
    *s = Region[1];
    *w = Region[2];
    *e = Region[3];

    return (1);
}

void GS_set_att_defaults(float *defs, float *null_defs)
{
    int i;

    G_debug(3, "GS_set_att_defaults");

    for (i = 0; i < MAX_ATTS; i++) {
        Default_const[i] = defs[i];
        Default_nulls[i] = null_defs[i];
    }

    return;
}

int GS_surf_exists(int id)
{
    int i, found = 0;

    G_debug(3, "GS_surf_exists(): id=%d", id);


    if (NULL == gs_get_surf(id)) {
        return (0);
    }

    for (i = 0; i < Next_surf && !found; i++) {
        if (Surf_ID[i] == id) {
            found = 1;
        }
    }

    return (found);
}

int GS_new_surface(void)
{
    geosurf *ns;

    G_debug(3, "GS_new_surface():");

    if (Next_surf < MAX_SURFS) {
        ns = gs_get_new_surface();
        gs_init_surf(ns, wind.west + wind.ew_res / 2.,
                     wind.south + wind.ns_res / 2., wind.rows, wind.cols,
                     wind.ew_res, wind.ns_res);
        gs_set_defaults(ns, Default_const, Default_nulls);

        /* make default shine current */
        gs_set_att_src(ns, ATT_SHINE, CONST_ATT);

        Surf_ID[Next_surf] = ns->gsurf_id;
        ++Next_surf;

        G_debug(3, "    id=%d", ns->gsurf_id);

        return (ns->gsurf_id);
    }



    return (-1);
}
void GS_set_light_reset(int i)
{
    Resetlight = i;
    if (i)
        Numlights = 0;
}
int GS_get_light_reset(void)
{
    return Resetlight;
}
int GS_new_light(void)
{
    int i;

    if (GS_get_light_reset()) {

        GS_set_light_reset(0);

        for (i = 0; i < MAX_LIGHTS; i++) {
            Gv.lights[i].position[X] = Gv.lights[i].position[Y] = 0.0;
            Gv.lights[i].position[Z] = 1.0;
            Gv.lights[i].position[W] = 0.0;     /* infinite */
            Gv.lights[i].color[0] = Gv.lights[i].color[1] =
                Gv.lights[i].color[2] = 1.0;
            Gv.lights[i].ambient[0] = Gv.lights[i].ambient[1] =
                Gv.lights[i].ambient[2] = 0.2;
            Gv.lights[i].shine = 32.0;
        }

        gsd_init_lightmodel();
    }

    if (Numlights < MAX_LIGHTS) {
        gsd_deflight(Numlights + 1, &(Gv.lights[Numlights]));
        gsd_switchlight(Numlights + 1, 1);

        return ++Numlights;
    }

    return -1;
}

void GS_setlight_position(int num, float xpos, float ypos, float zpos,
                          int local)
{
    if (num) {
        num -= 1;
        if (num < Numlights) {
            Gv.lights[num].position[X] = xpos;
            Gv.lights[num].position[Y] = ypos;
            Gv.lights[num].position[Z] = zpos;
            Gv.lights[num].position[W] = (float)local;

            gsd_deflight(num + 1, &(Gv.lights[num]));
        }
    }

    return;
}


void GS_getlight_position(int num, float *xpos, float *ypos, float *zpos,
                          int *local)
{
    if (num) {
        num -= 1;
        if (num < Numlights) {
            *xpos = Gv.lights[num].position[X];
            *ypos = Gv.lights[num].position[Y];
            *zpos = Gv.lights[num].position[Z];
            *local = (int)Gv.lights[num].position[W];

        }
    }

    return;
}

void GS_setlight_color(int num, float red, float green, float blue)
{
    if (num) {
        num -= 1;
        if (num < Numlights) {
            Gv.lights[num].color[0] = red;
            Gv.lights[num].color[1] = green;
            Gv.lights[num].color[2] = blue;

            gsd_deflight(num + 1, &(Gv.lights[num]));
        }
    }

    return;
}

void GS_getlight_color(int num, float *red, float *green, float *blue)
{
    if (num) {
        num -= 1;
        if (num < Numlights) {
            *red = Gv.lights[num].color[0];
            *green = Gv.lights[num].color[1];
            *blue = Gv.lights[num].color[2];
        }
    }

    return;
}

void GS_setlight_ambient(int num, float red, float green, float blue)
{
    if (num) {
        num -= 1;
        if (num < Numlights) {
            Gv.lights[num].ambient[0] = red;
            Gv.lights[num].ambient[1] = green;
            Gv.lights[num].ambient[2] = blue;

            gsd_deflight(num + 1, &(Gv.lights[num]));
        }
    }

    return;
}

void GS_getlight_ambient(int num, float *red, float *green, float *blue)
{
    if (num) {
        num -= 1;
        if (num < Numlights) {
            *red = Gv.lights[num].ambient[0];
            *green = Gv.lights[num].ambient[1];
            *blue = Gv.lights[num].ambient[2];
        }
    }

    return;
}


void GS_lights_off(void)
{
    int i;

    for (i = 0; i < Numlights; i++) {
        gsd_switchlight(i + 1, 0);
    }

    return;
}

void GS_lights_on(void)
{
    int i;

    for (i = 0; i < Numlights; i++) {
        gsd_switchlight(i + 1, 1);
    }

    return;
}

void GS_switchlight(int num, int on)
{
    if (num) {
        num -= 1;

        if (num < Numlights) {
            gsd_switchlight(num + 1, on);
        }
    }

    return;
}

int GS_transp_is_set(void)
{
    return (gs_att_is_set(NULL, ATT_TRANSP) || (FC_GREY == gsd_getfc()));
}

void GS_get_modelposition1(float pos[])
{
    /* TODO: Still needs work to handle other cases */
    /* this is a quick hack to get lighting adjustments debugged */
    /*
       GS_v3dir(Gv.from_to[FROM], Gv.from_to[TO], center);
       GS_v3mult(center, 1000);
       GS_v3add(center, Gv.from_to[FROM]);
     */

    gs_get_datacenter(pos);
    gs_get_data_avg_zmax(&(pos[Z]));

    G_debug(1, "GS_get_modelposition1(): model position: %f %f %f",
            pos[X], pos[Y], pos[Z]);

    return;
}

void GS_get_modelposition(float *siz, float *pos)
{
    float dist, near_h, dir[3];

    dist = 2. * Gd.nearclip;

    near_h = 2.0 * tan(4.0 * atan(1.) * Gv.fov / 3600.) * dist;
    *siz = near_h / 8.0;

    /* prevent clipping - would only happen if fov > ~127 degrees, at
       fov = 2.0 * atan(2.0) */

    if (*siz > Gd.nearclip) {
        *siz = Gd.nearclip;
    }

    GS_v3dir(Gv.from_to[FROM], Gv.from_to[TO], dir);

    pos[X] = Gv.from_to[FROM][X] + dir[X] * dist;
    pos[Y] = Gv.from_to[FROM][Y] + dir[Y] * dist;
    pos[Z] = Gv.from_to[FROM][Z] + dir[Z] * dist;

    return;
}


void GS_set_Narrow(int *pt, int id, float *pos2)
{
    geosurf *gs;
    float x, y, z;
    GLdouble modelMatrix[16], projMatrix[16];
    GLint viewport[4];

    if (GS_get_selected_point_on_surface(pt[X], pt[Y], &id, &x, &y, &z)) {
        gs = gs_get_surf(id);
        if (gs) {
            z = gs->zmax;
            pos2[X] = (float)x - gs->ox + gs->x_trans;
            pos2[Y] = (float)y - gs->oy + gs->y_trans;
            pos2[Z] = (float)z + gs->z_trans;

            return;
        }
    }
    else {
        gs = gs_get_surf(id);

        /* Need to get model matrix, etc 
         * to run gluUnProject
         */
        gsd_pushmatrix();
        gsd_do_scale(1);
        glGetDoublev(GL_MODELVIEW_MATRIX, modelMatrix);
        glGetDoublev(GL_PROJECTION_MATRIX, projMatrix);
        glGetIntegerv(GL_VIEWPORT, viewport);

        if (gs) {
            GLdouble out_near[3], out_far[3];
            GLdouble factor;
            GLdouble out[3];

            z = (float)gs->zmax + gs->z_trans;

            gluUnProject((GLdouble) pt[X], (GLdouble) pt[Y], (GLdouble) 0.,
                         modelMatrix, projMatrix, viewport,
                         &out_near[X], &out_near[Y], &out_near[Z]);
            gluUnProject((GLdouble) pt[X], (GLdouble) pt[Y], (GLdouble) 1.,
                         modelMatrix, projMatrix, viewport,
                         &out_far[X], &out_far[Y], &out_far[Z]);

            glPopMatrix();

            factor = (out_near[Z] - z) / (out_near[Z] - out_far[Z]);

            out[X] = out_near[X] - ((out_near[X] - out_far[X]) * factor);
            out[Y] = out_near[Y] - ((out_near[Y] - out_far[Y]) * factor);
            out[Z] = z;

            pos2[X] = (float)out[X];
            pos2[Y] = (float)out[Y];
            pos2[Z] = (float)out[Z];

            return;

        }
    }
    return;
}

void GS_draw_X(int id, float *pt)
{
    geosurf *gs;
    Point3 pos;
    float siz;

    if ((gs = gs_get_surf(id))) {
        GS_get_longdim(&siz);
        siz /= 200.;
        pos[X] = pt[X] - gs->ox;
        pos[Y] = pt[Y] - gs->oy;
        _viewcell_tri_interp(gs, pos);

        gsd_pushmatrix();

        gsd_do_scale(1);
        gsd_translate(gs->x_trans, gs->y_trans, gs->z_trans);
        gsd_linewidth(1);

        if (CONST_ATT == gs_get_att_src(gs, ATT_TOPO)) {
            pos[Z] = gs->att[ATT_TOPO].constant;
            gs = NULL;          /* tells gpd_obj to use given Z val */
        }

        gpd_obj(gs, Gd.bgcol, siz, ST_GYRO, pos);
        gsd_flush();

        gsd_popmatrix();
    }

    return;
}

void GS_draw_line_onsurf(int id, float x1, float y1, float x2, float y2)
{
    float p1[2], p2[2];
    geosurf *gs;

    if ((gs = gs_get_surf(id))) {
        p1[X] = x1 - gs->ox;
        p1[Y] = y1 - gs->oy;
        p2[X] = x2 - gs->ox;
        p2[Y] = y2 - gs->oy;

        gsd_pushmatrix();

        gsd_do_scale(1);
        gsd_translate(gs->x_trans, gs->y_trans, gs->z_trans);
        gsd_linewidth(1);

        gsd_color_func(GS_default_draw_color());
        gsd_line_onsurf(gs, p1, p2);

        gsd_popmatrix();
        gsd_flush();
    }

    return;
}

int GS_draw_nline_onsurf(int id, float x1, float y1, float x2, float y2,
                         float *lasp, int n)
{
    float p1[2], p2[2];
    geosurf *gs;
    int ret = 0;

    if ((gs = gs_get_surf(id))) {
        p1[X] = x1 - gs->ox;
        p1[Y] = y1 - gs->oy;
        p2[X] = x2 - gs->ox;
        p2[Y] = y2 - gs->oy;

        gsd_pushmatrix();

        gsd_do_scale(1);
        gsd_translate(gs->x_trans, gs->y_trans, gs->z_trans);
        gsd_linewidth(1);
        gsd_color_func(GS_default_draw_color());
        ret = gsd_nline_onsurf(gs, p1, p2, lasp, n);
        gsd_surf2real(gs, lasp);

        gsd_popmatrix();
        gsd_flush();
    }

    return (ret);
}

void GS_draw_flowline_at_xy(int id, float x, float y)
{
    geosurf *gs;
    float nv[3], pdir[2], mult;
    float p1[2], p2[2], next[2];
    int i = 0;

    if ((gs = gs_get_surf(id))) {
        p1[X] = x;
        p1[Y] = y;
        /* multiply by 1.5 resolutions to ensure a crossing ? */
        mult = .1 * (VXRES(gs) > VYRES(gs) ? VXRES(gs) : VYRES(gs));

        GS_coordpair_repeats(p1, p1, 50);

        while (1 == GS_get_norm_at_xy(id, p1[X], p1[Y], nv)) {
            if (nv[Z] == 1.0) {
                if (pdir[X] == 0.0 && pdir[Y] == 0.0) {
                    break;
                }

                p2[X] = p1[X] + (pdir[X] * mult);
                p2[Y] = p1[Y] + (pdir[Y] * mult);
            }
            else {
                /* use previous direction */
                GS_v2norm(nv);
                p2[X] = p1[X] + (nv[X] * mult);
                p2[Y] = p1[Y] + (nv[Y] * mult);
                pdir[X] = nv[X];
                pdir[Y] = nv[Y];
            }

            if (i > 2000) {
                break;
            }

            if (GS_coordpair_repeats(p1, p2, 0)) {
                break;
            }

            /* Think about this: */
            /* degenerate line means edge or level edge ? */
            /* next is filled with last point drawn */
            if (2 > GS_draw_nline_onsurf(id, p1[X], p1[Y],
                                         p2[X], p2[Y], next, 3)) {
                break;
            }

            p1[X] = next[X];
            p1[Y] = next[Y];
        }

        G_debug(3, "GS_draw_flowline_at_xy(): dir: %f %f", nv[X], nv[Y]);
    }

    return;
}

void GS_draw_fringe(int id, unsigned long clr, float elev, int *where)
{
    geosurf *gs;

    G_debug(3, "GS_draw_fringe(): id: %d clr: %ld elev %f edges: %d %d %d %d",
            id, clr, elev, where[0], where[1], where[2], where[3]);
    if ((gs = gs_get_surf(id)))
        gsd_display_fringe(gs, clr, elev, where);

}


int GS_draw_legend(const char *name, GLuint fontbase, int size, int *flags,
                   float *range, int *pt)
{
    int list_no;

    list_no = gsd_put_legend(name, fontbase, size, flags, range, pt);

    return (list_no);
}

void GS_draw_list(GLuint list_id)
{
    gsd_calllist(list_id);
    glFlush();
    return;
}

void GS_draw_all_list(void)
{
    gsd_calllists(0);           /* not sure if 0 is right - MN */
    glFlush();
    return;
}

void GS_delete_list(GLuint list_id)
{
    gsd_deletelist(list_id, 1);

    return;
}

void GS_draw_lighting_model1(void)
{
    static float center[3];
    float tcenter[3];

    if (!Modelshowing) {
        GS_get_modelposition1(center);
    }

    GS_v3eq(tcenter, center);

    gsd_zwritemask(0x0);
    gsd_backface(1);

    gsd_colormode(CM_AD);
    gsd_shademodel(DM_GOURAUD);
    gsd_pushmatrix();
    gsd_do_scale(1);

    if (Gv.vert_exag) {
        tcenter[Z] *= Gv.vert_exag;
        gsd_scale(1.0, 1.0, 1. / Gv.vert_exag);
    }

    gsd_drawsphere(tcenter, 0xDDDDDD, (float)(Longdim / 10.));
    gsd_popmatrix();
    Modelshowing = 1;

    gsd_backface(0);
    gsd_zwritemask(0xffffffff);

    return;
}

void GS_draw_lighting_model(void)
{
    static float center[3], size;
    float tcenter[3], tsize;
    int i, wason[MAX_CPLANES];

    gsd_get_cplanes_state(wason);

    for (i = 0; i < MAX_CPLANES; i++) {
        if (wason[i]) {
            gsd_cplane_off(i);
        }
    }


    if (!Modelshowing) {
        GS_get_modelposition(&size, center);
    }

    GS_v3eq(tcenter, center);
    tsize = size;

    gsd_zwritemask(0x0);
    gsd_backface(1);

    gsd_colormode(CM_DIFFUSE);
    gsd_shademodel(DM_GOURAUD);
    gsd_pushmatrix();
    gsd_drawsphere(tcenter, 0xDDDDDD, tsize);
    gsd_popmatrix();
    Modelshowing = 1;

    gsd_backface(0);
    gsd_zwritemask(0xffffffff);

    for (i = 0; i < MAX_CPLANES; i++) {
        if (wason[i]) {
            gsd_cplane_on(i);
        }
    }

    gsd_flush();

    return;
}

int GS_update_curmask(int id)
{
    geosurf *gs;

    gs = gs_get_surf(id);
    return (gs_update_curmask(gs));
}

int GS_is_masked(int id, float *pt)
{
    geosurf *gs;
    Point3 tmp;

    if ((gs = gs_get_surf(id))) {
        tmp[X] = pt[X] - gs->ox;
        tmp[Y] = pt[Y] - gs->oy;

        return (gs_point_is_masked(gs, tmp));
    }

    return (-1);
}

void GS_unset_SDsurf(void)
{
    gsdiff_set_SDref(NULL);
    SDref_surf = 0;

    return;
}

int GS_set_SDsurf(int id)
{
    geosurf *gs;

    if ((gs = gs_get_surf(id))) {
        gsdiff_set_SDref(gs);
        SDref_surf = id;

        return (1);
    }

    return (0);
}

int GS_set_SDscale(float scale)
{
    gsdiff_set_SDscale(scale);

    return (1);
}

int GS_get_SDsurf(int *id)
{
    geosurf *gs;

    if ((gs = gsdiff_get_SDref())) {
        *id = SDref_surf;

        return (1);
    }

    return (0);
}

int GS_get_SDscale(float *scale)
{
    *scale = gsdiff_get_SDscale();

    return (1);
}

int GS_update_normals(int id)
{
    geosurf *gs;

    gs = gs_get_surf(id);

    return (gs_calc_normals(gs));
}

int GS_get_att(int id, int att, int *set, float *constant, char *mapname)
{
    int src;
    geosurf *gs;

    gs = gs_get_surf(id);
    if (gs) {
        if (-1 != (src = gs_get_att_src(gs, att))) {
            *set = src;

            if (src == CONST_ATT) {
                *constant = gs->att[att].constant;
            }
            else if (src == MAP_ATT) {
                strcpy(mapname, gsds_get_name(gs->att[att].hdata));
            }

            return (1);
        }

        return (-1);
    }

    return (-1);
}

int GS_get_cat_at_xy(int id, int att, char *catstr, float x, float y)
{
    int offset, drow, dcol, vrow, vcol;
    float ftmp, pt[3];
    typbuff *buff;
    geosurf *gs;

    *catstr = '\0';
    gs = gs_get_surf(id);

    if (NULL == gs) {
        return -1;
    }

    pt[X] = x;
    pt[Y] = y;

    gsd_real2surf(gs, pt);
    if (gs_point_is_masked(gs, pt)) {
        return -1;
    }

    if (!in_vregion(gs, pt)) {
        return -1;
    }

    if (MAP_ATT != gs_get_att_src(gs, att)) {
        sprintf(catstr, _("no category info"));
        return -1;
    }

    buff = gs_get_att_typbuff(gs, att, 0);

    vrow = Y2VROW(gs, pt[Y]);
    vcol = X2VCOL(gs, pt[X]);
    drow = VROW2DROW(gs, vrow);
    dcol = VCOL2DCOL(gs, vcol);

    offset = DRC2OFF(gs, drow, dcol);
    
    if (GET_MAPATT(buff, offset, ftmp)) {
        return
            (Gs_get_cat_label(gsds_get_name(gs->att[att].hdata),
                              drow, dcol, catstr));
    }

    sprintf(catstr, _("no data"));

    return 1;
}

int GS_get_norm_at_xy(int id, float x, float y, float *nv)
{
    int offset, drow, dcol, vrow, vcol;
    float pt[3];
    geosurf *gs;

    gs = gs_get_surf(id);

    if (NULL == gs) {
        return (-1);
    }

    if (gs->norm_needupdate) {
        gs_calc_normals(gs);
    }

    pt[X] = x;
    pt[Y] = y;

    gsd_real2surf(gs, pt);
    if (gs_point_is_masked(gs, pt)) {
        return (-1);
    }

    if (!in_vregion(gs, pt)) {
        return (-1);
    }

    vrow = Y2VROW(gs, pt[Y]);
    vcol = X2VCOL(gs, pt[X]);
    drow = VROW2DROW(gs, vrow);
    dcol = VCOL2DCOL(gs, vcol);

    offset = DRC2OFF(gs, drow, dcol);

    if (gs->norms) {
        FNORM(gs->norms[offset], nv);
    }
    else {
        /* otherwise must be a constant */
        nv[0] = 0.0;
        nv[1] = 0.0;
        nv[2] = 1.0;
    }

    return (1);
}

int GS_get_val_at_xy(int id, int att, char *valstr, float x, float y)
{
    int offset, drow, dcol, vrow, vcol;
    float ftmp, pt[3];
    typbuff *buff;
    geosurf *gs;

    *valstr = '\0';
    gs = gs_get_surf(id);
    
    if (NULL == gs) {
        return -1;
    }

    pt[X] = x;
    pt[Y] = y;

    gsd_real2surf(gs, pt);

    if (gs_point_is_masked(gs, pt)) {
        return -1;
    }

    if (!in_vregion(gs, pt)) {
        return (-1);
    }

    if (CONST_ATT == gs_get_att_src(gs, att)) {
        if (att == ATT_COLOR) {
            int r, g, b, i;

            i = gs->att[att].constant;
            sprintf(valstr, "R%d G%d B%d",
                    INT_TO_RED(i, r), INT_TO_GRN(i, g), INT_TO_BLU(i, b));
        }
        else {
            sprintf(valstr, "%f", gs->att[att].constant);
        }

        return 1;
    }
    else if (MAP_ATT != gs_get_att_src(gs, att)) {
        return -1;
    }

    buff = gs_get_att_typbuff(gs, att, 0);

    vrow = Y2VROW(gs, pt[Y]);
    vcol = X2VCOL(gs, pt[X]);
    drow = VROW2DROW(gs, vrow);
    dcol = VCOL2DCOL(gs, vcol);

    offset = DRC2OFF(gs, drow, dcol);

    if (GET_MAPATT(buff, offset, ftmp)) {
        if (att == ATT_COLOR) {
            int r, g, b, i;

            i = gs_mapcolor(gs_get_att_typbuff(gs, ATT_COLOR, 0),
                            &(gs->att[ATT_COLOR]), offset);
            sprintf(valstr, "R%d G%d B%d",
                    INT_TO_RED(i, r), INT_TO_GRN(i, g), INT_TO_BLU(i, b));
        }
        else {
            sprintf(valstr, "%f", ftmp);
        }

        return (1);
    }

    sprintf(valstr, "NULL");

    return (1);
}

int GS_unset_att(int id, int att)
{
    geosurf *gs;

    gs = gs_get_surf(id);
    gs->mask_needupdate = 1;

    return (gs_set_att_src(gs, att, NOTSET_ATT));
}

int GS_set_att_const(int id, int att, float constant)
{
    geosurf *gs;
    int ret;

    gs = gs_get_surf(id);
    ret = (gs_set_att_const(gs, att, constant));

    Gs_update_attrange(gs, att);

    return (ret);
}

int GS_set_maskmode(int id, int mode)
{
    geosurf *gs;

    gs = gs_get_surf(id);

    if (gs) {
        gs->att[ATT_MASK].constant = mode;
        gs->mask_needupdate = 1;

        return (mode);
    }

    return (-1);
}

int GS_get_maskmode(int id, int *mode)
{
    geosurf *gs;

    gs = gs_get_surf(id);

    if (gs) {
        *mode = gs->att[ATT_MASK].constant;

        return (1);
    }

    return (-1);
}

int GS_Set_ClientData(int id, void *clientd)
{
    geosurf *gs;

    gs = gs_get_surf(id);
    if (gs) {
        gs->clientdata = clientd;

        return (1);
    }

    return (-1);
}

void *GS_Get_ClientData(int id)
{
    geosurf *gs;

    gs = gs_get_surf(id);
    if (gs) {
        return (gs->clientdata);
    }

    return (NULL);
}

int GS_num_surfs(void)
{
    return (gs_num_surfaces());
}

int *GS_get_surf_list(int *numsurfs)
{
    int i, *ret;

    *numsurfs = Next_surf;

    if (Next_surf) {
        ret = (int *)G_malloc(Next_surf * sizeof(int));

        for (i = 0; i < Next_surf; i++) {
            ret[i] = Surf_ID[i];
        }

        return (ret);
    }

    return (NULL);
}

int GS_delete_surface(int id)
{
    int i, j, found;
    
    found = FALSE;
    
    G_debug(1, "GS_delete_surface(): id=%d", id);
    
    if (GS_surf_exists(id)) {
        gs_delete_surf(id);
        for (i = 0; i < Next_surf && !found; i++) {
            if (Surf_ID[i] == id) {
                found = TRUE;

                for (j = i; j < Next_surf; j++) {
                    Surf_ID[j] = Surf_ID[j + 1];
                }
            }
        }
        
        gv_update_drapesurfs();

        if (found) {
            --Next_surf;
            return 1;
        }
    }

    return -1;
}


int GS_load_att_map(int id, const char *filename, int att)
{
    geosurf *gs;
    unsigned int changed;
    unsigned int atty;
    const char *mapset;
    struct Cell_head rast_head;
    int reuse, begin, hdata, ret, neg, has_null;
    typbuff *tbuff;

    G_debug(3, "GS_load_att_map(): map=%s", filename);

    reuse = ret = neg = has_null = 0;
    gs = gs_get_surf(id);

    if (NULL == gs) {
        return -1;
    }

    gs->mask_needupdate = (ATT_MASK == att || ATT_TOPO == att ||
                           (gs->nz_topo && ATT_TOPO == att) ||
                           (gs->nz_color && ATT_COLOR == att));

    gs_set_att_src(gs, att, MAP_ATT);

    /* Check against maps already loaded in memory   */
    /* if to be color attribute:
       - if packed color for another surface, OK to reuse
       - if unchanged, ok to reuse IF it's of type char (will have lookup)
     */
    begin = hdata = 1;

    /* Get MAPSET to ensure names are fully qualified */
    mapset = G_find_cell2(filename, "");
    if (mapset == NULL) {
        /* Check for valid filename */
        G_warning("Raster map <%s> not found", filename);
        return -1;
    }
    
    /* Check to see if map is in Region */
    G_get_cellhd(filename, mapset, &rast_head);
    if (rast_head.north <= wind.south ||
        rast_head.south >= wind.north ||
        rast_head.east <= wind.west || rast_head.west >= wind.east) {

        G_warning(_("Raster map <%s> is outside of current region. Load failed."),
                  G_fully_qualified_name(filename, mapset));
    }

    while (!reuse && (0 < hdata)) {
        changed = CF_COLOR_PACKED;
        atty = ATTY_FLOAT | ATTY_CHAR | ATTY_INT | ATTY_SHORT | ATTY_MASK;

        if (0 < (hdata = gsds_findh(filename, &changed, &atty, begin))) {

            G_debug(3, "GS_load_att_map(): %s already has data handle %d.CF=%x",
                    filename, hdata, changed);

            /* handle found */
            if (ATT_COLOR == att) {
                if ((changed == CF_COLOR_PACKED) ||
                    (!changed && atty == ATTY_CHAR)) {
                    reuse = 1;
                }
            }
            else if (atty == ATTY_MASK && att != ATT_MASK) {
                reuse = 0;
                /* should also free mask data & share new - but need backward
                   reference? */
            }
            else if (!changed) {
                reuse = 1;
            }
        }

        begin = 0;
    }

    if (reuse) {
        gs->att[att].hdata = hdata;
        gs_set_att_type(gs, att, atty); /* ?? */

        /* free lookup  & set to NULL! */
        if (atty == ATTY_INT) {
            if (gs->att[att].lookup) {
                free(gs->att[att].lookup);
                gs->att[att].lookup = NULL;
            }
        }
        /* TODO: FIX THIS stuff with lookup sharing! */

        G_debug(3, "GS_load_att_map(): %s is being reused. hdata=%d",
                filename, hdata);
    }
    else {
        G_debug(3, "GS_load_att_map(): %s not loaded in correct form - loading now",
                filename);

        /* not loaded - need to get new dataset handle */
        gs->att[att].hdata = gsds_newh(filename);

        tbuff = gs_get_att_typbuff(gs, att, 1);

        /* TODO: Provide mechanism for loading certain attributes at
           specified sizes, allow to scale or cap, or scale non-zero */
        if (ATT_MASK == att) {
            atty = ATTY_MASK;
        }
        else {
            atty = Gs_numtype(filename, &neg);
        }

#ifdef MAYBE_LATER
        if (att == ATT_COLOR && atty == ATTY_SHORT) {
            atty = (neg ? ATTY_INT : ATTY_SHORT);
        }
#endif

        if (att == ATT_COLOR && atty == ATTY_SHORT) {
            atty = ATTY_INT;
        }

        if (0 > gs_malloc_att_buff(gs, att, ATTY_NULL)) {
            G_fatal_error(_("GS_load_att_map(): Out of memory. Unable to load map"));
        }

        switch (atty) {
        case ATTY_MASK:
            if (0 > gs_malloc_att_buff(gs, att, ATTY_MASK)) {
                G_fatal_error(_("GS_load_att_map(): Out of memory. Unable to load map"));
            }

            ret = Gs_loadmap_as_bitmap(&wind, filename, tbuff->bm);
            
            break;
        case ATTY_CHAR:
            if (0 > gs_malloc_att_buff(gs, att, ATTY_CHAR)) {
                G_fatal_error(_("GS_load_att_map(): Out of memory. Unable to load map"));
            }

            ret = Gs_loadmap_as_char(&wind, filename, tbuff->cb,
                                     tbuff->nm, &has_null);

            break;
        case ATTY_SHORT:
            if (0 > gs_malloc_att_buff(gs, att, ATTY_SHORT)) {
                G_fatal_error(_("GS_load_att_map(): Out of memory. Unable to load map"));
            }

            ret = Gs_loadmap_as_short(&wind, filename, tbuff->sb,
                                      tbuff->nm, &has_null);
            break;
        case ATTY_FLOAT:
            if (0 > gs_malloc_att_buff(gs, att, ATTY_FLOAT)) {
                G_fatal_error(_("GS_load_att_map(): Out of memory. Unable to load map"));
            }

            ret = Gs_loadmap_as_float(&wind, filename, tbuff->fb,
                                      tbuff->nm, &has_null);

            break;
        case ATTY_INT:
        default:
            if (0 > gs_malloc_att_buff(gs, att, ATTY_INT)) {
                G_fatal_error(_("GS_load_att_map(): Out of memory. Unable to load map"));
            }

            ret = Gs_loadmap_as_int(&wind, filename, tbuff->ib,
                                    tbuff->nm, &has_null);
            break;

        }                       /* Done with switch */

        if (ret == -1) {
            gsds_free_data_buff(gs->att[att].hdata, ATTY_NULL);
            return -1;
        }

        G_debug(4, "  has_null=%d", has_null);

        if (!has_null) {
            gsds_free_data_buff(gs->att[att].hdata, ATTY_NULL);
        }
        else {
            gs_update_curmask(gs);
        }

    }                           /* end if not reuse */

    if (ATT_COLOR == att) {
#ifdef MAYBE_LATER
        if (ATTY_INT == atty) {
            Gs_pack_colors(filename, tbuff->ib, gs->rows, gs->cols);
            gsds_set_changed(gs->att[att].hdata, CF_COLOR_PACKED);
            gs->att[att].lookup = NULL;
        }
        else {
            gs_malloc_lookup(gs, att);
            Gs_build_lookup(filename, gs->att[att].lookup);
        }
#else

        if (ATTY_CHAR == atty) {
            if (!gs->att[att].lookup) {
                /* might already exist if reusing */
                gs_malloc_lookup(gs, att);
                Gs_build_256lookup(filename, gs->att[att].lookup);
            }
        }
        else if (ATTY_FLOAT == atty) {
            if (!reuse) {
                if (0 > gs_malloc_att_buff(gs, att, ATTY_INT)) {
                    G_fatal_error(_("GS_load_att_map(): Out of memory. Unable to load map"));
                }

                Gs_pack_colors_float(filename, tbuff->fb, tbuff->ib,
                                     gs->rows, gs->cols);
                gsds_set_changed(gs->att[att].hdata, CF_COLOR_PACKED);
                gsds_free_data_buff(gs->att[att].hdata, ATTY_FLOAT);
                gs->att[att].lookup = NULL;
            }
        }
        else {
            if (!reuse) {
                Gs_pack_colors(filename, tbuff->ib, gs->rows, gs->cols);
                gsds_set_changed(gs->att[att].hdata, CF_COLOR_PACKED);
                gs->att[att].lookup = NULL;
            }
        }
#endif
    }

    if (ATT_TOPO == att) {
        gs_init_normbuff(gs);
        /* S_DIFF: should also check here to see if this surface is a
           reference surface for scaled differences, if so update references
           to it */
    }

    if (ret < 0) {
        G_warning(_("Loading failed"));
    }

    if (-1 == Gs_update_attrange(gs, att)) {
        G_warning(_("Error finding range"));
    }

    return ret;
}

void GS_draw_surf(int id)
{
    geosurf *gs;

    G_debug(3, "GS_draw_surf(): id=%d", id);

    gs = gs_get_surf(id);
    if (gs) {
        gsd_shademodel(gs->draw_mode & DM_GOURAUD);

        if (gs->draw_mode & DM_POLY) {
            gsd_surf(gs);
        }

        if (gs->draw_mode & DM_WIRE) {
            gsd_wire_surf(gs);
        }

        /* TODO: write wire/poly draw routines */
        if (gs->draw_mode & DM_WIRE_POLY) {
            gsd_surf(gs);
            gsd_wire_surf(gs);
        }
    }

    return;
}

void GS_draw_wire(int id)
{
    geosurf *gs;

    G_debug(3, "GS_draw_wire(): id=%d", id);

    gs = gs_get_surf(id);

    if (gs) {
        gsd_wire_surf(gs);
    }

    return;
}

void GS_alldraw_wire(void)
{
    geosurf *gs;
    int i;

    for (i = 0; i < Next_surf; i++) {
        if ((gs = gs_get_surf(Surf_ID[i]))) {
            gsd_wire_surf(gs);
        }
    }

    return;
}

void GS_alldraw_surf(void)
{
    int i;

    for (i = 0; i < Next_surf; i++) {
        GS_draw_surf(Surf_ID[i]);
    }

    return;
}

void GS_set_exag(int id, float exag)
{
    geosurf *gs;

    G_debug(3, "GS_set_exag");

    gs = gs_get_surf(id);

    if (gs) {
        if (gs->z_exag != exag) {
            gs->norm_needupdate = 1;
        }

        gs->z_exag = exag;
    }

    return;
}

void GS_set_global_exag(float exag)
{

    G_debug(3, "GS_set_global_exag");

    Gv.vert_exag = exag;
    /* GL_NORMALIZE */
    /* Only need to update norms gs_norms.c
     * if exag is used in norm equation which
     * it is not! If GL_NORMALIZE is disabled
     * will need to include.
     gs_setall_norm_needupdate();
     */

    return;
}

float GS_global_exag(void)
{
    G_debug(3, "GS_global_exag(): %g", Gv.vert_exag);

    return (Gv.vert_exag);
}

void GS_set_wire_color(int id, int colr)
{
    geosurf *gs;

    G_debug(3, "GS_set_wire_color");

    gs = gs_get_surf(id);

    if (gs) {
        gs->wire_color = colr;
    }

    return;
}

int GS_get_wire_color(int id, int *colr)
{
    geosurf *gs;

    gs = gs_get_surf(id);

    if (gs) {
        *colr = gs->wire_color;

        return (1);
    }

    return (-1);
}

int GS_setall_drawmode(int mode)
{
    int i;

    for (i = 0; i < Next_surf; i++) {
        if (0 != GS_set_drawmode(Surf_ID[i], mode)) {
            return (-1);
        }
    }

    return (0);
}

int GS_set_drawmode(int id, int mode)
{
    geosurf *gs;

    G_debug(3, "GS_set_drawmode(): id=%d mode=%d", id, mode);

    gs = gs_get_surf(id);

    if (gs) {
        gs->draw_mode = mode;

        return (0);
    }

    return (-1);
}

int GS_get_drawmode(int id, int *mode)
{
    geosurf *gs;

    gs = gs_get_surf(id);

    if (gs) {
        *mode = gs->draw_mode;

        return (1);
    }

    return (-1);
}

void GS_set_nozero(int id, int att, int mode)
{
    geosurf *gs;

    G_debug(3, "GS_set_nozero");

    gs = gs_get_surf(id);

    if (gs) {
        if (att == ATT_TOPO) {
            gs->nz_topo = mode;
            gs->mask_needupdate = 1;
        }

        if (att == ATT_COLOR) {
            gs->nz_color = mode;
            gs->mask_needupdate = 1;
        }
    }

    return;
}

int GS_get_nozero(int id, int att, int *mode)
{
    geosurf *gs;

    G_debug(3, "GS_set_nozero");

    gs = gs_get_surf(id);

    if (gs) {
        if (att == ATT_TOPO) {
            *mode = gs->nz_topo;
        }
        else if (att == ATT_COLOR) {
            *mode = gs->nz_color;
        }
        else {
            return (-1);
        }

        return (1);
    }

    return (-1);
}

int GS_setall_drawres(int xres, int yres, int xwire, int ywire)
{
    int i;

    for (i = 0; i < Next_surf; i++) {
        if (0 != GS_set_drawres(Surf_ID[i], xres, yres, xwire, ywire)) {
            return (-1);
        }
    }

    return (0);
}

int GS_set_drawres(int id, int xres, int yres, int xwire, int ywire)
{
    geosurf *gs;

    G_debug(3, "GS_set_drawres() id=%d xyres=%d/%d xywire=%d/%d",
            id, xres, yres, xwire, ywire);

    if (xres < 1 || yres < 1 || xwire < 1 || ywire < 1) {
        return (-1);
    }

    gs = gs_get_surf(id);

    if (gs) {
        if (gs->x_mod != xres || gs->y_mod != yres) {
            gs->norm_needupdate = 1;
        }

        gs->x_mod = xres;
        gs->y_mod = yres;
        gs->x_modw = xwire;
        gs->y_modw = ywire;
    }

    return (0);
}

void GS_get_drawres(int id, int *xres, int *yres, int *xwire, int *ywire)
{
    geosurf *gs;

    G_debug(3, "GS_get_drawres");

    gs = gs_get_surf(id);

    if (gs) {
        *xres = gs->x_mod;
        *yres = gs->y_mod;
        *xwire = gs->x_modw;
        *ywire = gs->y_modw;
    }

    return;
}

void GS_get_dims(int id, int *rows, int *cols)
{
    geosurf *gs;

    gs = gs_get_surf(id);

    if (gs) {
        *rows = gs->rows;
        *cols = gs->cols;
    }

    return;
}

int GS_get_exag_guess(int id, float *exag)
{
    geosurf *gs;
    float guess;

    gs = gs_get_surf(id);
    guess = 1.0;

    /* if gs is type const return guess = 1.0 */
    if (CONST_ATT == gs_get_att_src(gs, ATT_TOPO)) {
        return (1);
    }

    if (gs) {
        if (gs->zrange_nz == 0.0) {
            *exag = 0.0;

            return (1);
        }

        G_debug(3, "GS_get_exag_guess(): %f %f", gs->zrange_nz, Longdim);

        while (gs->zrange_nz * guess / Longdim >= .25) {
            guess *= .1;

            G_debug(3, "GS_get_exag_guess(): %f", guess);
        }

        while (gs->zrange_nz * guess / Longdim < .025) {
            guess *= 10.;

            G_debug(3, "GS_get_exag_guess(): %f", guess);
        }

        *exag = guess;

        return (1);
    }

    return (-1);
}

void GS_get_zrange_nz(float *min, float *max)
{
    int i, first = 1;
    geosurf *gs;

    for (i = 0; i < Next_surf; i++) {
        if ((gs = gs_get_surf(Surf_ID[i]))) {
            if (first) {
                first = 0;
                *min = gs->zmin_nz;
                *max = gs->zmax_nz;
            }

            if (gs->zmin_nz < *min) {
                *min = gs->zmin_nz;
            }

            if (gs->zmax_nz > *max) {
                *max = gs->zmax_nz;
            }
        }
    }

    G_debug(3, "GS_get_zrange_nz(): min=%g max=%g", *min, *max);

    return;
}

void GS_set_trans(int id, float xtrans, float ytrans, float ztrans)
{
    geosurf *gs;

    G_debug(3, "GS_set_trans");

    gs = gs_get_surf(id);

    if (gs) {
        gs->x_trans = xtrans;
        gs->y_trans = ytrans;
        gs->z_trans = ztrans;
    }

    return;
}

void GS_get_trans(int id, float *xtrans, float *ytrans, float *ztrans)
{
    geosurf *gs;

    G_debug(3, "GS_get_trans");

    gs = gs_get_surf(id);

    if (gs) {
        *xtrans = gs->x_trans;
        *ytrans = gs->y_trans;
        *ztrans = gs->z_trans;
    }

    return;
}


unsigned int GS_default_draw_color(void)
{

    G_debug(3, "GS_default_draw_color");

    return ((unsigned int)Gd.bgcol);
}

unsigned int GS_background_color(void)
{
    return ((unsigned int)Gd.bgcol);
}

void GS_set_draw(int where)
{
    Buffermode = where;

    switch (where) {
    case GSD_BOTH:
        gsd_frontbuffer(1);
        gsd_backbuffer(1);

        break;
    case GSD_FRONT:
        gsd_frontbuffer(1);
        gsd_backbuffer(0);

        break;
    case GSD_BACK:
    default:
        gsd_frontbuffer(0);
        gsd_backbuffer(1);

        break;
    }

    return;
}

/*
   \brief Ready to draw
 */
void GS_ready_draw(void)
{

    G_debug(3, "GS_ready_draw");

    gsd_set_view(&Gv, &Gd);

    return;
}

void GS_done_draw(void)
{

    G_debug(3, "GS_done_draw");

    if (GSD_BACK == Buffermode) {
        gsd_swapbuffers();
    }

    gsd_flush();

    return;
}

void GS_set_focus(float *realto)
{

    G_debug(3, "GS_set_focus(): %f,%f,%f", realto[0], realto[1], realto[2]);

    Gv.infocus = 1;
    GS_v3eq(Gv.real_to, realto);

    gsd_set_view(&Gv, &Gd);

    return;
}

void GS_set_focus_real(float *realto)
{

    G_get_set_window(&wind);
    realto[X] = realto[X] - wind.west - (wind.ew_res / 2.);
    realto[Y] = realto[Y] - wind.south - (wind.ns_res / 2.);

    Gv.infocus = 1;
    GS_v3eq(Gv.real_to, realto);

    gsd_set_view(&Gv, &Gd);

    return;
}


int GS_get_focus(float *realto)
{

    G_debug(3, "GS_get_focus");

    if (Gv.infocus) {
        if (realto) {
            GS_v3eq(realto, Gv.real_to);
        }
    }

    return (Gv.infocus);
}

void GS_set_focus_center_map(int id)
{
    float center[3];
    geosurf *gs;

    G_debug(3, "GS_set_focus_center_map");

    gs = gs_get_surf(id);

    if (gs) {
        center[X] = (gs->xmax - gs->xmin) / 2.;
        center[Y] = (gs->ymax - gs->ymin) / 2.;
        center[Z] = (gs->zmax_nz + gs->zmin_nz) / 2.;

        /* not yet working
           buff = gs_get_att_typbuff(gs, ATT_TOPO, 0);
           offset = gs->rows*gs->cols/2 + gs->cols/2;
           if (buff)
           {
           if (GET_MAPATT(buff, offset, tmp))
           {
           center[Z] = tmp;
           }
           }
         */

        GS_set_focus(center);
    }
}

void GS_moveto(float *pt)
{
    float ft[3];

    G_debug(3, "GS_moveto(): %f,%f,%f", pt[0], pt[1], pt[2]);

    if (Gv.infocus) {
        GS_v3eq(Gv.from_to[FROM], pt);
        /*
           GS_v3eq(Gv.from_to[TO], Gv.real_to);
         */
        GS_v3normalize(Gv.from_to[FROM], Gv.from_to[TO]);
        /* update inclination, look_dir if we're keeping these */
    }
    else {
        GS_v3eq(ft, Gv.from_to[TO]);
        GS_v3sub(ft, Gv.from_to[FROM]);
        GS_v3eq(Gv.from_to[FROM], pt);
        GS_v3eq(Gv.from_to[TO], pt);
        GS_v3add(Gv.from_to[TO], ft);
    }

    return;
}

void GS_moveto_real(float *pt)
{
    gsd_real2model(pt);
    GS_moveto(pt);

    return;
}

int GS_get_zextents(int id, float *min, float *max, float *mid)
{
    geosurf *gs;

    if (NULL == (gs = gs_get_surf(id))) {
        return (-1);
    }

    G_debug(3, "GS_get_zextents(): id=%d", id);

    return (gs_get_zextents(gs, min, max, mid));
}

int GS_get_zrange(float *min, float *max, int doexag)
{
    int ret_surf, ret_vol;
    float surf_min, surf_max;
    float vol_min, vol_max;

    ret_surf = gs_get_zrange(&surf_min, &surf_max);
    ret_vol = gvl_get_zrange(&vol_min, &vol_max);

    if (ret_surf > 0 && ret_vol > 0) {
        *min = (surf_min < vol_min) ? surf_min : vol_min;
        *max = (surf_max < vol_max) ? surf_max : vol_max;
    }
    else if (ret_surf > 0) {
        *min = surf_min;
        *max = surf_max;
    }
    else if (ret_vol > 0) {
        *min = vol_min;
        *max = vol_max;
    }

    if (doexag) {
        *min *= Gv.vert_exag;
        *max *= Gv.vert_exag;
    }

    G_debug(3, "GS_get_zrange(): min=%g max=%g", *min, *max);
    return ((ret_surf > 0 || ret_vol > 0) ? (1) : (-1));
}

void GS_get_from(float *fr)
{
    GS_v3eq(fr, Gv.from_to[FROM]);

    G_debug(3, "GS_get_from(): %f,%f,%f", fr[0], fr[1], fr[2]);

    return;
}

void GS_get_from_real(float *fr)
{
    GS_v3eq(fr, Gv.from_to[FROM]);
    gsd_model2real(fr);

    return;
}

void GS_get_to_real(float *to)
{
    float realto[3];

    G_get_set_window(&wind);
    GS_get_focus(realto);
    to[X] = realto[X] + wind.west + (wind.ew_res / 2.);
    to[Y] = realto[Y] + wind.south + (wind.ns_res / 2.);
    to[Z] = realto[Z];

    return;
}


void GS_zoom_setup(int *a, int *b, int *c, int *d, int *maxx, int *maxy)
{
    GLint tmp[4];
    GLint num[2];

    gsd_getViewport(tmp, num);
    *a = tmp[0];
    *b = tmp[1];
    *c = tmp[2];
    *d = tmp[3];
    *maxx = num[0];
    *maxy = num[1];

    return;
}

void GS_get_to(float *to)
{
    G_debug(3, "GS_get_to");

    GS_v3eq(to, Gv.from_to[TO]);

    return;
}

void GS_get_viewdir(float *dir)
{
    GS_v3dir(Gv.from_to[FROM], Gv.from_to[TO], dir);

    return;
}

void GS_set_viewdir(float *dir)
{
    float tmp[3];

    GS_v3eq(tmp, dir);
    GS_v3norm(tmp);
    GS_v3eq(Gv.from_to[TO], Gv.from_to[FROM]);
    GS_v3add(Gv.from_to[TO], tmp);

    GS_set_nofocus();
    gsd_set_view(&Gv, &Gd);

    return;
}

void GS_set_fov(int fov)
{
    Gv.fov = fov;

    return;
}

int GS_get_fov(void)
{
    return (Gv.fov);
}

int GS_get_twist(void)
{
    return (Gv.twist);
}

void GS_set_twist(int t)
{
    Gv.twist = t;

    return;
}

void GS_set_rotation(double angle, double x, double y, double z)
{
    Gv.rotate.rot_angle = angle;
    Gv.rotate.rot_axes[0] = x;
    Gv.rotate.rot_axes[1] = y;
    Gv.rotate.rot_axes[2] = z;
    Gv.rotate.do_rot = 1;

    return;
}

void GS_unset_rotation(void)
{
    Gv.rotate.do_rot = 0;
}

void GS_init_rotation(void)
{
    int i;

    for (i = 0; i < 16; i++) {
        if (i == 0 || i == 5 || i == 10 || i == 15)
            Gv.rotate.rotMatrix[i] = 1.0;
        else
            Gv.rotate.rotMatrix[i] = 0.0;
    }
    Gv.rotate.rot_angle = 0.0;
    Gv.rotate.rot_axes[0] = 0.0;
    Gv.rotate.rot_axes[1] = 0.0;
    Gv.rotate.rot_axes[2] = 0.0;
    Gv.rotate.do_rot = 0;
    
}
void GS_get_rotation_matrix(double *matrix)
{
    int i;

    for (i = 0; i < 16; i++) {
        matrix[i] = Gv.rotate.rotMatrix[i];
    }
}

void GS_set_rotation_matrix(double *matrix)
{
    int i;

    for (i = 0; i < 16; i++) {
        Gv.rotate.rotMatrix[i] = matrix[i];
    }
}

void GS_set_nofocus(void)
{
    G_debug(3, "GS_set_nofocus");

    Gv.infocus = 0;

    return;
}

void GS_set_infocus(void)
{
    G_debug(3, "GS_set_infocus");

    Gv.infocus = 1;

    return;
}

void GS_set_viewport(int left, int right, int bottom, int top)
{
    G_debug(3, "GS_set_viewport(): left=%d, right=%d, "
            "bottom=%d, top=%d", left, right, bottom, top);

    gsd_viewport(left, right, bottom, top);

    return;
}

int GS_look_here(int sx, int sy)
{
    float x, y, z, len, los[2][3];
    Point3 realto, dir;
    int id;
    geosurf *gs;

    if (GS_get_selected_point_on_surface(sx, sy, &id, &x, &y, &z)) {
        gs = gs_get_surf(id);
        if (gs) {
            realto[X] = x - gs->ox + gs->x_trans;
            realto[Y] = y - gs->oy + gs->y_trans;
            realto[Z] = z + gs->z_trans;
            GS_set_focus(realto);

            return (1);
        }
    }
    else {
        if (gsd_get_los(los, (short)sx, (short)sy)) {
            len = GS_distance(Gv.from_to[FROM], Gv.real_to);
            GS_v3dir(los[FROM], los[TO], dir);
            GS_v3mult(dir, len);
            realto[X] = Gv.from_to[FROM][X] + dir[X];
            realto[Y] = Gv.from_to[FROM][Y] + dir[Y];
            realto[Z] = Gv.from_to[FROM][Z] + dir[Z];
            GS_set_focus(realto);

            return (1);
        }
    }

    return (0);
}

int GS_get_selected_point_on_surface(int sx, int sy, int *id, float *x,
                                     float *y, float *z)
{
    float los[2][3], find_dist[MAX_SURFS], closest;
    Point3 point, tmp, finds[MAX_SURFS];
    int surfs[MAX_SURFS], i, iclose, numhits = 0;
    geosurf *gs;

    /* returns surface-world coords */
    gsd_get_los(los, (short)sx, (short)sy);

    if (!gs_setlos_enterdata(los)) {
        G_debug(3, "gs_setlos_enterdata(los): returns false");
        return (0);
    }

    for (i = 0; i < Next_surf; i++) {
        G_debug(3, "id=%d", i);

        gs = gs_get_surf(Surf_ID[i]);

        /* los_intersect expects surf-world coords (xy transl, no scaling) */

#if NVIZ_HACK
        if (gs_los_intersect1(Surf_ID[i], los, point)) {
#else
        if (gs_los_intersect(Surf_ID[i], los, point)) {
#endif
            if (!gs_point_is_masked(gs, point)) {
                GS_v3eq(tmp, point);
                tmp[X] += gs->x_trans;
                tmp[Y] += gs->y_trans;
                tmp[Z] += gs->z_trans;
                find_dist[numhits] = GS_distance(los[FROM], tmp);
                gsd_surf2real(gs, point);
                GS_v3eq(finds[numhits], point);
                surfs[numhits] = Surf_ID[i];
                numhits++;
            }
        }
    }

    for (i = iclose = 0; i < numhits; i++) {
        closest = find_dist[iclose];

        if (find_dist[i] < closest) {
            iclose = i;
        }
    }

    if (numhits) {
        *x = finds[iclose][X];
        *y = finds[iclose][Y];
        *z = finds[iclose][Z];
        *id = surfs[iclose];
    }

    G_debug(3, "NumHits %d, next %d", numhits, Next_surf);

    return (numhits);
}

void GS_set_cplane_rot(int num, float dx, float dy, float dz)
{
    gsd_cplane_setrot(num, dx, dy, dz);

    return;
}

void GS_set_cplane_trans(int num, float dx, float dy, float dz)
{
    gsd_cplane_settrans(num, dx, dy, dz);

    return;
}


void GS_draw_cplane(int num)
{
    geosurf *gsurfs[MAX_SURFS];
    int nsurfs;

    nsurfs = gs_num_surfaces();
    if (2 == nsurfs) {
        /* testing */
        gs_getall_surfaces(gsurfs);
        gsd_draw_cplane_fence(gsurfs[0], gsurfs[1], num);
    }
    else {
        gsd_draw_cplane(num);
    }

    return;
}

int GS_draw_cplane_fence(int hs1, int hs2, int num)
{
    geosurf *gs1, *gs2;

    if (NULL == (gs1 = gs_get_surf(hs1))) {
        return (0);
    }

    if (NULL == (gs2 = gs_get_surf(hs2))) {
        return (0);
    }

    gsd_draw_cplane_fence(gs1, gs2, num);

    return (1);
}

void GS_alldraw_cplane_fences(void)
{
    int onstate[MAX_CPLANES], i;

    gsd_get_cplanes_state(onstate);

    for (i = 0; i < MAX_CPLANES; i++) {
        if (onstate[i]) {
            GS_draw_cplane_fence(Surf_ID[0], Surf_ID[1], i);
        }
    }

    return;
}

void GS_set_cplane(int num)
{
    gsd_cplane_on(num);

    return;
}

void GS_unset_cplane(int num)
{
    gsd_cplane_off(num);

    return;
}

void GS_get_scale(float *sx, float *sy, float *sz, int doexag)
{
    float zexag;

    zexag = doexag ? Gv.vert_exag : 1.;
    *sx = *sy = Gv.scale;
    *sz = Gv.scale * zexag;

    return;
}

void GS_set_fencecolor(int mode)
{
    gsd_setfc(mode);

    return;
}

int GS_get_fencecolor(void)
{
    return gsd_getfc();
}

int GS_get_distance_alongsurf(int hs, float x1, float y1, float x2, float y2,
                              float *dist, int use_exag)
{
    geosurf *gs;
    float p1[2], p2[2];
    
    gs = gs_get_surf(hs);
    if (gs == NULL) {
        return 0;
    }
    
    p1[X] = x1;
    p1[Y] = y1;
    p2[X] = x2;
    p2[Y] = y2;
    gsd_real2surf(gs, p1);
    gsd_real2surf(gs, p2);

    G_debug(3, "GS_get_distance_alongsurf(): hs=%d p1=%f,%f p2=%f,%f",
            hs, x1, y1, x2, y2);
    return gs_distance_onsurf(gs, p1, p2, dist, use_exag);
}

int GS_save_3dview(const char *vname, int surfid)
{
    return (Gs_save_3dview(vname, &Gv, &Gd, &wind, gs_get_surf(surfid)));
}

int GS_load_3dview(const char *vname, int surfid)
{

    return (Gs_load_3dview(vname, &Gv, &Gd, &wind, gs_get_surf(surfid)));

    /* what to do about lights - I guess, delete all &
       create any that exist in 3dview file */
}

/************************************************************************
* Following routines use Graphics Library
************************************************************************/

void GS_init_view(void)
{
    int i;
    static int first = 1;

    G_debug(3, "GS_init_view");

    if (first) {
        first = 0;
        glMatrixMode(GL_MODELVIEW);

        /* OGLXXX doublebuffer: use GLX_DOUBLEBUFFER in attriblist */
        /* glxChooseVisual(*dpy, screen, *attriblist); */
        /* OGLXXX
         * ZMIN not needed -- always 0.
         * ZMAX not needed -- always 1.
         * getgdesc other posiblilties:
         *      glxGetConfig();
         *      glxGetCurrentContext();
         *      glxGetCurrentDrawable();
         * GLint gdtmp;
         * getgdesc other posiblilties:
         *      glxGetConfig();
         *      glxGetCurrentContext();
         *      glxGetCurrentDrawable();
         * GLint gdtmp;
         * glDepthRange params must be scaled to [0, 1]
         */
        glDepthRange(0.0, 1.0);
        glEnable(GL_DEPTH_TEST);
        glDepthFunc(GL_LEQUAL);
        /* } */

        /* replace these with something meaningful */
        Gv.fov = 450;
        Gv.twist = 0;

        GS_init_rotation();

        Gv.from_to[FROM][X] = Gv.from_to[FROM][Y] =
            Gv.from_to[FROM][Z] = GS_UNIT_SIZE / 2.;

        Gv.from_to[TO][X] = GS_UNIT_SIZE / 2.;
        Gv.from_to[TO][Y] = GS_UNIT_SIZE / 2.;
        Gv.from_to[TO][Z] = 0.;
        Gv.from_to[TO][W] = Gv.from_to[FROM][W] = 1.;

        Gv.real_to[W] = 1.;
        Gv.vert_exag = 1.;

        GS_v3eq(Gv.real_to, Gv.from_to[TO]);
        GS_v3normalize(Gv.from_to[FROM], Gv.from_to[TO]);

        /*
           Gd.nearclip = 50;
           Gd.farclip = 10000.;
         */
        Gd.nearclip = 10.;
        Gd.farclip = 10000.;
        Gd.aspect = (float)GS_get_aspect();

        GS_set_focus(Gv.real_to);
    }

    return;
}

void GS_clear(int col)
{
    G_debug(3, "GS_clear");

    col = col | 0xFF000000;

    /* OGLXXX
     * change glClearDepth parameter to be in [0, 1]
     * ZMAX not needed -- always 1.
     * getgdesc other posiblilties:
     *      glxGetConfig();
     *      glxGetCurrentContext();
     *      glxGetCurrentDrawable();
     * GLint gdtmp;
     */
    glClearDepth(1.0);
    glClearColor(((float)((col) & 0xff)) / 255.,
                 (float)((col) >> 8 & 0xff) / 255.,
                 (float)((col) >> 16 & 0xff) / 255.,
                 (float)((col) >> 24 & 0xff) / 255.);
    glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);

    Gd.bgcol = col;
    Modelshowing = 0;
    gsd_flush();

    return;
}

double GS_get_aspect(void)
{
    int left, right, bottom, top;
    GLint tmp[4];

    /* OGLXXX
     * get GL_VIEWPORT:
     * You can probably do better than this.
     */
    glGetIntegerv(GL_VIEWPORT, tmp);
    left = tmp[0];
    right = tmp[0] + tmp[2] - 1;
    bottom = tmp[1];
    top = tmp[1] + tmp[3] - 1;

    G_debug(3, "GS_get_aspect(): left=%d, right=%d, top=%d, bottom=%d",
            left, right, top, bottom);

    return ((double)(right - left) / (top - bottom));
}

int GS_has_transparency(void)
{
    /* OGLXXX
     * getgdesc other posiblilties:
     *      glxGetConfig();
     *      glxGetCurrentContext();
     *      glxGetCurrentDrawable();
     * GLint gdtmp;
     * blending is ALWAYS supported.
     * This function returns whether it is enabled.
     * return((glGetIntegerv(GL_BLEND, &gdtmp), gdtmp));
     */

    return (1);
}