/*
* This file is part of the DXX-Rebirth project .
* 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.
*/
/*
*
* Rod routines
*
*/
#include "3d.h"
#include "globvars.h"
#include "maths.h"
#if !DXX_USE_OGL
#include "gr.h"
#endif
#include "compiler-range_for.h"
namespace dcx {
namespace {
struct rod_4point
{
std::array point_list;
std::array points;
};
//compute the corners of a rod. fills in vertbuf.
static int calc_rod_corners(rod_4point &rod_point_group, const g3s_point &bot_point,fix bot_width,const g3s_point &top_point,fix top_width)
{
//compute vector from one point to other, do cross product with vector
//from eye to get perpendiclar
auto delta_vec = vm_vec_sub(bot_point.p3_vec,top_point.p3_vec);
//unscale for aspect
delta_vec.x = fixdiv(delta_vec.x,Matrix_scale.x);
delta_vec.y = fixdiv(delta_vec.y,Matrix_scale.y);
//calc perp vector
//do lots of normalizing to prevent overflowing. When this code works,
//it should be optimized
vm_vec_normalize(delta_vec);
const auto top = vm_vec_normalized(top_point.p3_vec);
auto rod_norm = vm_vec_cross(delta_vec,top);
vm_vec_normalize(rod_norm);
//scale for aspect
rod_norm.x = fixmul(rod_norm.x,Matrix_scale.x);
rod_norm.y = fixmul(rod_norm.y,Matrix_scale.y);
//now we have the usable edge. generate four points
//top points
auto tempv = vm_vec_copy_scale(rod_norm,top_width);
tempv.z = 0;
rod_point_group.point_list[0] = &rod_point_group.points[0];
rod_point_group.point_list[1] = &rod_point_group.points[1];
rod_point_group.point_list[2] = &rod_point_group.points[2];
rod_point_group.point_list[3] = &rod_point_group.points[3];
auto &rod_points = rod_point_group.points;
vm_vec_add(rod_points[0].p3_vec,top_point.p3_vec,tempv);
vm_vec_sub(rod_points[1].p3_vec,top_point.p3_vec,tempv);
vm_vec_copy_scale(tempv,rod_norm,bot_width);
tempv.z = 0;
vm_vec_sub(rod_points[2].p3_vec,bot_point.p3_vec,tempv);
vm_vec_add(rod_points[3].p3_vec,bot_point.p3_vec,tempv);
//now code the four points
ubyte codes_and = 0xff;
range_for (auto &i, rod_points)
{
codes_and &= g3_code_point(i);
//clear flags for new points (not projected)
i.p3_flags = {};
}
return codes_and;
}
}
//draw a bitmap object that is always facing you
//returns 1 if off screen, 0 if drew
void g3_draw_rod_tmap(grs_canvas &canvas, grs_bitmap &bitmap, const g3s_point &bot_point, fix bot_width, const g3s_point &top_point, fix top_width, g3s_lrgb light)
{
rod_4point rod;
if (calc_rod_corners(rod,bot_point,bot_width,top_point,top_width))
return;
const fix average_light = static_cast(light.r+light.g+light.b)/3;
const std::array uvl_list{{
{ 0x0200, 0x0200, average_light },
{ 0xfe00, 0x0200, average_light },
{ 0xfe00, 0xfe00, average_light },
{ 0x0200, 0xfe00, average_light }
}};
const std::array lrgb_list{{
light,
light,
light,
light,
}};
g3_draw_tmap(canvas, rod.point_list, uvl_list, lrgb_list, bitmap);
}
#if !DXX_USE_OGL
//draws a bitmap with the specified 3d width & height
//returns 1 if off screen, 0 if drew
void g3_draw_bitmap(grs_canvas &canvas, const vms_vector &pos, fix width, fix height, grs_bitmap &bm)
{
g3s_point pnt;
fix w,h;
if (g3_rotate_point(pnt,pos) & CC_BEHIND)
return;
g3_project_point(pnt);
if (pnt.p3_flags & projection_flag::overflow)
return;
#ifndef __powerc
const auto pz = pnt.p3_z;
if (const auto ox = checkmuldiv(width, Canv_w2, pz))
w = fixmul(*ox, Matrix_scale.x);
else
return;
if (const auto oy = checkmuldiv(height, Canv_h2, pz))
h = fixmul(*oy, Matrix_scale.y);
else
return;
#else
if (pnt.p3_z == 0)
return;
double fz = f2fl(pnt.p3_z);
w = fixmul(fl2f(((f2fl(width)*fCanv_w2) / fz)), Matrix_scale.x);
h = fixmul(fl2f(((f2fl(height)*fCanv_h2) / fz)), Matrix_scale.y);
#endif
const fix blob0y = pnt.p3_sy - h, blob1x = pnt.p3_sx + w;
const std::array blob_vertices{{
{pnt.p3_sx - w, blob0y},
{blob1x, blob0y},
{blob1x, pnt.p3_sy + h},
}};
scale_bitmap(bm, blob_vertices, 0, canvas.cv_bitmap);
}
#endif
}