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