f3d4dff941
Adjust code_window_point to use the same masks as clipping_code. Previously, it had top and bottom swapped. However, since its output was only ever compared for equality to 0, this transposition should not affect the observable behavior.
166 lines
4.2 KiB
C++
166 lines
4.2 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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* Rod routines
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*
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*/
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#include "3d.h"
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#include "globvars.h"
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#include "maths.h"
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#if !DXX_USE_OGL
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#include "gr.h"
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#endif
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#include "compiler-range_for.h"
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namespace dcx {
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namespace {
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struct rod_4point
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{
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std::array<cg3s_point *, 4> point_list;
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std::array<g3s_point, 4> points;
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};
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//compute the corners of a rod. fills in vertbuf.
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static clipping_code calc_rod_corners(rod_4point &rod_point_group, const g3s_point &bot_point,fix bot_width,const g3s_point &top_point,fix top_width)
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{
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//compute vector from one point to other, do cross product with vector
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//from eye to get perpendiclar
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auto delta_vec = vm_vec_sub(bot_point.p3_vec,top_point.p3_vec);
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//unscale for aspect
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delta_vec.x = fixdiv(delta_vec.x,Matrix_scale.x);
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delta_vec.y = fixdiv(delta_vec.y,Matrix_scale.y);
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//calc perp vector
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//do lots of normalizing to prevent overflowing. When this code works,
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//it should be optimized
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vm_vec_normalize(delta_vec);
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const auto top = vm_vec_normalized(top_point.p3_vec);
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auto rod_norm = vm_vec_cross(delta_vec,top);
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vm_vec_normalize(rod_norm);
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//scale for aspect
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rod_norm.x = fixmul(rod_norm.x,Matrix_scale.x);
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rod_norm.y = fixmul(rod_norm.y,Matrix_scale.y);
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//now we have the usable edge. generate four points
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//top points
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auto tempv = vm_vec_copy_scale(rod_norm,top_width);
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tempv.z = 0;
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rod_point_group.point_list[0] = &rod_point_group.points[0];
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rod_point_group.point_list[1] = &rod_point_group.points[1];
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rod_point_group.point_list[2] = &rod_point_group.points[2];
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rod_point_group.point_list[3] = &rod_point_group.points[3];
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auto &rod_points = rod_point_group.points;
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vm_vec_add(rod_points[0].p3_vec,top_point.p3_vec,tempv);
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vm_vec_sub(rod_points[1].p3_vec,top_point.p3_vec,tempv);
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vm_vec_copy_scale(tempv,rod_norm,bot_width);
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tempv.z = 0;
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vm_vec_sub(rod_points[2].p3_vec,bot_point.p3_vec,tempv);
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vm_vec_add(rod_points[3].p3_vec,bot_point.p3_vec,tempv);
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//now code the four points
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clipping_code codes_and{0xff};
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range_for (auto &i, rod_points)
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{
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codes_and &= g3_code_point(i);
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//clear flags for new points (not projected)
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i.p3_flags = {};
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}
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return codes_and;
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}
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}
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//draw a bitmap object that is always facing you
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//returns 1 if off screen, 0 if drew
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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)
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{
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rod_4point rod;
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if (calc_rod_corners(rod, bot_point, bot_width, top_point, top_width) != clipping_code::None)
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return;
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const fix average_light = static_cast<unsigned>(light.r+light.g+light.b)/3;
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const std::array<g3s_uvl, 4> uvl_list{{
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{ 0x0200, 0x0200, average_light },
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{ 0xfe00, 0x0200, average_light },
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{ 0xfe00, 0xfe00, average_light },
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{ 0x0200, 0xfe00, average_light }
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}};
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const std::array<g3s_lrgb, 4> lrgb_list{{
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light,
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light,
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light,
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light,
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}};
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g3_draw_tmap(canvas, rod.point_list, uvl_list, lrgb_list, bitmap);
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}
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#if !DXX_USE_OGL
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//draws a bitmap with the specified 3d width & height
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//returns 1 if off screen, 0 if drew
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void g3_draw_bitmap(grs_canvas &canvas, const vms_vector &pos, fix width, fix height, grs_bitmap &bm)
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{
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g3s_point pnt;
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fix w,h;
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if ((g3_rotate_point(pnt, pos) & clipping_code::behind) != clipping_code::None)
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return;
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g3_project_point(pnt);
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if (pnt.p3_flags & projection_flag::overflow)
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return;
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#ifndef __powerc
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const auto pz = pnt.p3_z;
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if (const auto ox = checkmuldiv(width, Canv_w2, pz))
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w = fixmul(*ox, Matrix_scale.x);
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else
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return;
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if (const auto oy = checkmuldiv(height, Canv_h2, pz))
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h = fixmul(*oy, Matrix_scale.y);
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else
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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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double fz = f2fl(pnt.p3_z);
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w = fixmul(fl2f(((f2fl(width)*fCanv_w2) / fz)), Matrix_scale.x);
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h = fixmul(fl2f(((f2fl(height)*fCanv_h2) / fz)), Matrix_scale.y);
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#endif
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const fix blob0y = pnt.p3_sy - h, blob1x = pnt.p3_sx + w;
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const std::array<grs_point, 3> blob_vertices{{
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{pnt.p3_sx - w, blob0y},
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{blob1x, blob0y},
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{blob1x, pnt.p3_sy + h},
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}};
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scale_bitmap(bm, blob_vertices, 0, canvas.cv_bitmap);
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}
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#endif
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}
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