surf3d.cpp

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#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
 
#include "surf3d.h"
 
void grid3d_free(grid3d **grid)
{
    free ((*grid)->surf.vertex);
    free ((*grid)->surf.svertex);
    free (*grid);
    *grid = nullptr;
}
 
grid3d *grid3d_new (int sizex, int defx, int sizez, int defz, v3d center) {
        int x = defx;
        int y = defz;
        auto *g = (grid3d*)malloc (sizeof(grid3d));
        surf3d *s = &(g->surf);
        s->nbvertex = x*y;
        s->vertex = (v3d*)malloc (sizeof(v3d)*x*y);
        s->svertex = (v3d*)malloc(sizeof(v3d)*x*y);
        s->center = center;
        
        g->defx=defx;
        g->sizex=sizex;
        g->defz=defz;
        g->sizez=sizez;
        g->mode=0;
 
        while (y) {
                --y;
                x = defx;
                while (x) {
                        --x;
                        s->vertex[x+defx*y].x = (x-defx/2.0F)*sizex/defx;
                        s->vertex[x+defx*y].y = 0;
                        s->vertex[x+defx*y].z = (y-defz/2.0F)*sizez/defz;
                }
        }
        return g;
}
 
//#undef HAVE_MMX
#include "drawmethods.h"
 
void surf3d_draw (surf3d *s, int color, int dist, int *buf, int *back, int W,int H) {
        v2d v2 {};
        
        for (int i=0;i<s->nbvertex;i++) {
                V3D_TO_V2D(s->svertex[i],v2,W,H,dist);
                int *p1 = buf + v2.x + (v2.y*static_cast<ptrdiff_t>(W));
                int *p2 = back + v2.x + (v2.y*static_cast<ptrdiff_t>(W));
                if ((v2.x>=0) && (v2.y>=0) && (v2.x<W) && (v2.y<H)) {
                        *p1 = color;
                }
 
                /* Squelch a gcc warning */
                (void)p2;
        }
}
 
void grid3d_draw (grid3d *g, int color, int colorlow,
                                                                        int dist, int *buf, int *back, int W,int H) {
        v2d v2  {};
        v2d v2x {};
        
        for (int x=0;x<g->defx;x++) {
                V3D_TO_V2D(g->surf.svertex[x],v2x,W,H,dist);
 
                for (int z=1;z<g->defz;z++) {
                        V3D_TO_V2D(g->surf.svertex[z*g->defx + x],v2,W,H,dist);
                        if (((v2.x != -666) || (v2.y!=-666))
                                        && ((v2x.x != -666) || (v2x.y!=-666))) {
                                draw_line(buf,v2x.x,v2x.y,v2.x,v2.y, colorlow, W, H);
                                draw_line(back,v2x.x,v2x.y,v2.x,v2.y, color, W, H);
                                DRAWMETHOD_DONE();
                        }
                        v2x = v2;
                }
        }
}
 
void surf3d_rotate (surf3d *s, float angle) {
        float cosa = NAN;
        float sina = NAN;
        SINCOS(angle,sina,cosa);
        for (int i=0;i<s->nbvertex;i++) {
                Y_ROTATE_V3D(s->vertex[i],s->svertex[i],cosa,sina);
        }
}
 
void surf3d_translate (surf3d *s) {
        for (int i=0;i<s->nbvertex;i++) {
                TRANSLATE_V3D(s->center,s->svertex[i]);
        }
}
 
void grid3d_update (grid3d *g, float angle, const float *vals, float dist) {
        float cosa = NAN;
        float sina = NAN;
        surf3d *s = &(g->surf);
        v3d cam = s->center;
        cam.z += dist;
 
        SINCOS((angle/4.3F),sina,cosa);
        cam.y += sina*2.0F;
        SINCOS(angle,sina,cosa);
 
        if (g->mode==0) {
                if (vals)
                        for (int i=0;i<g->defx;i++)
                                s->vertex[i].y = s->vertex[i].y*0.2F + vals[i]*0.8F;
 
                for (int i=g->defx;i<s->nbvertex;i++) {
                        s->vertex[i].y *= 0.255F;
                        s->vertex[i].y += (s->vertex[i-g->defx].y * 0.777F);
                }
        }
 
        for (int i=0;i<s->nbvertex;i++) {
                Y_ROTATE_V3D(s->vertex[i],s->svertex[i],cosa,sina);
                TRANSLATE_V3D(cam,s->svertex[i]);
        }
}