280 lines
6.8 KiB
C++
280 lines
6.8 KiB
C++
/*
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* This file is part of the DXX-Rebirth project <https://www.dxx-rebirth.com/>.
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* It is copyright by its individual contributors, as recorded in the
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* project's Git history. See COPYING.txt at the top level for license
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* terms and a link to the Git history.
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*/
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/*
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*
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* Drawing routines
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*
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*/
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#include "dxxerror.h"
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#include "3d.h"
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#include "globvars.h"
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#include "texmap.h"
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#if !DXX_USE_OGL
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#include "clipper.h"
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#include "gr.h"
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#endif
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namespace dcx {
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tmap_drawer_type tmap_drawer_ptr = draw_tmap;
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//specifies 2d drawing routines to use instead of defaults. Passing
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//NULL for either or both restores defaults
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void g3_set_special_render(tmap_drawer_type tmap_drawer)
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{
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tmap_drawer_ptr = tmap_drawer;
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}
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#if !DXX_USE_OGL
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//deal with a clipped line
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static void must_clip_line(grs_canvas &canvas, g3s_point *p0, g3s_point *p1, const uint8_t codes_or, const uint8_t color, temporary_points_t &tp)
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{
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if ((p0->p3_flags&PF_TEMP_POINT) || (p1->p3_flags&PF_TEMP_POINT))
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; //line has already been clipped, so give up
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else {
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clip_line(p0,p1,codes_or,tp);
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g3_draw_line(canvas, *p0, *p1, color, tp);
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}
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//free temp points
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if (p0->p3_flags & PF_TEMP_POINT)
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tp.free_temp_point(p0);
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if (p1->p3_flags & PF_TEMP_POINT)
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tp.free_temp_point(p1);
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}
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//draws a line. takes two points. returns true if drew
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void g3_draw_line(grs_canvas &canvas, g3s_point &p0, g3s_point &p1, const uint8_t color)
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{
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temporary_points_t tp;
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g3_draw_line(canvas, p0, p1, color, tp);
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}
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void g3_draw_line(grs_canvas &canvas, g3s_point &p0, g3s_point &p1, const uint8_t color, temporary_points_t &tp)
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{
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ubyte codes_or;
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if (p0.p3_codes & p1.p3_codes)
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return;
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codes_or = p0.p3_codes | p1.p3_codes;
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if (
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(codes_or & CC_BEHIND) ||
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(static_cast<void>((p0.p3_flags & PF_PROJECTED) || (g3_project_point(p0), 0)), p0.p3_flags & PF_OVERFLOW) ||
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(static_cast<void>((p1.p3_flags & PF_PROJECTED) || (g3_project_point(p1), 0)), p1.p3_flags & PF_OVERFLOW)
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)
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return must_clip_line(canvas, &p0,&p1, codes_or, color, tp);
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gr_line(canvas, p0.p3_sx, p0.p3_sy, p1.p3_sx, p1.p3_sy, color);
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}
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#endif
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//returns true if a plane is facing the viewer. takes the unrotated surface
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//normal of the plane, and a point on it. The normal need not be normalized
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bool g3_check_normal_facing(const vms_vector &v,const vms_vector &norm)
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{
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return (vm_vec_dot(vm_vec_sub(View_position,v),norm) > 0);
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}
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bool do_facing_check(const std::array<cg3s_point *, 3> &vertlist)
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{
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//normal not specified, so must compute
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//get three points (rotated) and compute normal
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const auto tempv = vm_vec_perp(vertlist[0]->p3_vec,vertlist[1]->p3_vec,vertlist[2]->p3_vec);
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return (vm_vec_dot(tempv,vertlist[1]->p3_vec) < 0);
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}
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#if !DXX_USE_OGL
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//deal with face that must be clipped
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static void must_clip_flat_face(grs_canvas &canvas, int nv, g3s_codes cc, polygon_clip_points &Vbuf0, polygon_clip_points &Vbuf1, const uint8_t color)
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{
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temporary_points_t tp;
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auto &bufptr = clip_polygon(Vbuf0,Vbuf1,&nv,&cc,tp);
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if (nv>0 && !(cc.uor&CC_BEHIND) && !cc.uand) {
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std::array<fix, MAX_POINTS_IN_POLY*2> Vertex_list;
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for (int i=0;i<nv;i++) {
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g3s_point *p = bufptr[i];
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if (!(p->p3_flags&PF_PROJECTED))
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g3_project_point(*p);
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if (p->p3_flags&PF_OVERFLOW) {
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goto free_points;
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}
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Vertex_list[i*2] = p->p3_sx;
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Vertex_list[i*2+1] = p->p3_sy;
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}
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gr_upoly_tmap(canvas, nv, Vertex_list, color);
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}
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//free temp points
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free_points:
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;
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}
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//draw a flat-shaded face.
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//returns 1 if off screen, 0 if drew
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void _g3_draw_poly(grs_canvas &canvas, const uint_fast32_t nv, cg3s_point *const *const pointlist, const uint8_t color)
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{
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g3s_codes cc;
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polygon_clip_points Vbuf0, Vbuf1;
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auto bufptr = &Vbuf0[0];
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for (int i=0;i<nv;i++) {
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bufptr[i] = pointlist[i];
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cc.uand &= bufptr[i]->p3_codes;
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cc.uor |= bufptr[i]->p3_codes;
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}
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if (cc.uand)
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return; //all points off screen
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if (cc.uor)
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{
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must_clip_flat_face(canvas, nv, cc, Vbuf0, Vbuf1, color);
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return;
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}
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//now make list of 2d coords (& check for overflow)
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std::array<fix, MAX_POINTS_IN_POLY*2> Vertex_list;
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for (int i=0;i<nv;i++) {
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g3s_point *p = bufptr[i];
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if (!(p->p3_flags&PF_PROJECTED))
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g3_project_point(*p);
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if (p->p3_flags&PF_OVERFLOW)
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{
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must_clip_flat_face(canvas, nv, cc, Vbuf0, Vbuf1, color);
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return;
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}
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Vertex_list[i*2] = p->p3_sx;
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Vertex_list[i*2+1] = p->p3_sy;
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}
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gr_upoly_tmap(canvas, nv, Vertex_list, color);
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//say it drew
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}
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static void must_clip_tmap_face(grs_canvas &, int nv, g3s_codes cc, grs_bitmap &bm, polygon_clip_points &Vbuf0, polygon_clip_points &Vbuf1);
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//draw a texture-mapped face.
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//returns 1 if off screen, 0 if drew
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void _g3_draw_tmap(grs_canvas &canvas, const unsigned nv, cg3s_point *const *const pointlist, const g3s_uvl *const uvl_list, const g3s_lrgb *const light_rgb, grs_bitmap &bm)
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{
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g3s_codes cc;
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polygon_clip_points Vbuf0, Vbuf1;
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auto bufptr = &Vbuf0[0];
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for (int i=0;i<nv;i++) {
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g3s_point *p;
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p = bufptr[i] = pointlist[i];
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cc.uand &= p->p3_codes;
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cc.uor |= p->p3_codes;
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#if !DXX_USE_OGL
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p->p3_u = uvl_list[i].u;
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p->p3_v = uvl_list[i].v;
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p->p3_l = (light_rgb[i].r+light_rgb[i].g+light_rgb[i].b)/3;
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#endif
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p->p3_flags |= PF_UVS + PF_LS;
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}
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if (cc.uand)
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return; //all points off screen
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if (cc.uor)
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{
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must_clip_tmap_face(canvas, nv, cc, bm, Vbuf0, Vbuf1);
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return;
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}
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//now make list of 2d coords (& check for overflow)
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for (int i=0;i<nv;i++) {
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g3s_point *p = bufptr[i];
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if (!(p->p3_flags&PF_PROJECTED))
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g3_project_point(*p);
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if (p->p3_flags&PF_OVERFLOW) {
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Int3(); //should not overflow after clip
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return;
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}
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}
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(*tmap_drawer_ptr)(canvas, bm, nv, bufptr);
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}
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static void must_clip_tmap_face(grs_canvas &canvas, int nv, g3s_codes cc, grs_bitmap &bm, polygon_clip_points &Vbuf0, polygon_clip_points &Vbuf1)
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{
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temporary_points_t tp;
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auto &bufptr = clip_polygon(Vbuf0,Vbuf1,&nv,&cc,tp);
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if (nv && !(cc.uor&CC_BEHIND) && !cc.uand) {
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for (int i=0;i<nv;i++) {
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g3s_point *p = bufptr[i];
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if (!(p->p3_flags&PF_PROJECTED))
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g3_project_point(*p);
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if (p->p3_flags&PF_OVERFLOW) {
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Int3(); //should not overflow after clip
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goto free_points;
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}
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}
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(*tmap_drawer_ptr)(canvas, bm, nv, &bufptr[0]);
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}
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free_points:
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;
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// Assert(free_point_num==0);
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}
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//draw a sortof sphere - i.e., the 2d radius is proportional to the 3d
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//radius, but not to the distance from the eye
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void g3_draw_sphere(grs_canvas &canvas, cg3s_point &pnt, const fix rad, const uint8_t color)
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{
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if (! (pnt.p3_codes & CC_BEHIND)) {
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if (! (pnt.p3_flags & PF_PROJECTED))
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g3_project_point(pnt);
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if (! (pnt.p3_codes & PF_OVERFLOW)) {
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const auto r2 = fixmul(rad, Matrix_scale.x);
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#ifndef __powerc
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fix t;
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if (!checkmuldiv(&t, r2, Canv_w2, pnt.p3_z))
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return;
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#else
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if (pnt.p3_z == 0)
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return;
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const fix t = fl2f(((f2fl(r2) * fCanv_w2) / f2fl(pnt.p3_z)));
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#endif
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gr_disk(canvas, pnt.p3_sx, pnt.p3_sy, t, color);
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}
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}
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}
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#endif
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}
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