327 lines
10 KiB
C++
327 lines
10 KiB
C++
/*
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* Portions of this file are copyright Rebirth contributors and licensed as
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* described in COPYING.txt.
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* Portions of this file are copyright Parallax Software and licensed
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* according to the Parallax license below.
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* See COPYING.txt for license details.
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THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
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SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
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END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
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ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
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IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
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SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
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FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
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CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
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AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
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COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
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*/
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/*
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*
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* Header file for 3d library
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* except for functions implemented in interp.c
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*
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*/
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#pragma once
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#include <cstdint>
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#include "dxxsconf.h"
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#include "dsx-ns.h"
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#include "maths.h"
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#include "vecmat.h" //the vector/matrix library
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#include "compiler-array.h"
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struct grs_bitmap;
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#ifdef EDITOR
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namespace dcx {
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extern int g3d_interp_outline; //if on, polygon models outlined in white
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}
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#endif
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//Structure for storing u,v,light values. This structure doesn't have a
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//prefix because it was defined somewhere else before it was moved here
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struct g3s_uvl {
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fix u,v,l;
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};
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//Structure for storing light color. Also uses l of g3s-uvl to add/compute mono (white) light
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struct g3s_lrgb {
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fix r,g,b;
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};
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//Stucture to store clipping codes in a word
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struct g3s_codes {
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ubyte uor,uand; //or is low byte, and is high byte
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constexpr g3s_codes() :
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uor(0), uand(0xff)
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{
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}
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};
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//flags for point structure
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constexpr uint8_t PF_PROJECTED = 1; //has been projected, so sx,sy valid
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constexpr uint8_t PF_OVERFLOW = 2; //can't project
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constexpr uint8_t PF_TEMP_POINT = 4; //created during clip
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constexpr uint8_t PF_UVS = 8; //has uv values set
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constexpr uint8_t PF_LS = 16; //has lighting values set
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//clipping codes flags
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constexpr uint8_t CC_OFF_LEFT = 1;
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constexpr uint8_t CC_OFF_RIGHT = 2;
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constexpr uint8_t CC_OFF_BOT = 4;
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constexpr uint8_t CC_OFF_TOP = 8;
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constexpr uint8_t CC_BEHIND = 0x80;
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//Used to store rotated points for mines. Has frame count to indictate
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//if rotated, and flag to indicate if projected.
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struct g3s_point {
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vms_vector p3_vec; //x,y,z of rotated point
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fix p3_u,p3_v,p3_l; //u,v,l coords
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fix p3_sx,p3_sy; //screen x&y
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ubyte p3_codes; //clipping codes
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ubyte p3_flags; //projected?
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uint16_t p3_last_generation;
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};
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//macros to reference x,y,z elements of a 3d point
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#define p3_x p3_vec.x
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#define p3_y p3_vec.y
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#define p3_z p3_vec.z
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//An object, such as a robot
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struct g3s_object {
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vms_vector o3_pos; //location of this object
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vms_angvec o3_orient; //orientation of this object
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int o3_nverts; //number of points in the object
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int o3_nfaces; //number of faces in the object
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//this will be filled in later
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};
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#ifdef __cplusplus
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//Functions in library
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//Frame setup functions:
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namespace dcx {
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#ifdef OGL
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typedef const g3s_point cg3s_point;
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#else
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typedef g3s_point cg3s_point;
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#endif
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//start the frame
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void g3_start_frame(void);
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//set view from x,y,z, viewer matrix, and zoom. Must call one of g3_set_view_*()
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void g3_set_view_matrix(const vms_vector &view_pos,const vms_matrix &view_matrix,fix zoom);
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//end the frame
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#ifdef OGL
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#define g3_end_frame() ogl_end_frame()
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#else
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#define g3_end_frame()
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#endif
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//Instancing
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//instance at specified point with specified orientation
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void g3_start_instance_matrix(const vms_vector &pos,const vms_matrix *orient);
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//instance at specified point with specified orientation
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void g3_start_instance_angles(const vms_vector &pos,const vms_angvec *angles);
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//pops the old context
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void g3_done_instance();
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//Misc utility functions:
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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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//Point definition and rotation functions:
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//specify the arrays refered to by the 'pointlist' parms in the following
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//functions. I'm not sure if we will keep this function, but I need
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//it now.
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//void g3_set_points(g3s_point *points,vms_vector *vecs);
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//returns codes_and & codes_or of a list of points numbers
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g3s_codes g3_check_codes(int nv,g3s_point **pointlist);
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namespace dcx {
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//rotates a point. returns codes. does not check if already rotated
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ubyte g3_rotate_point(g3s_point &dest,const vms_vector &src);
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static inline g3s_point g3_rotate_point(const vms_vector &src) __attribute_warn_unused_result;
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static inline g3s_point g3_rotate_point(const vms_vector &src)
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{
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g3s_point dest;
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return g3_rotate_point(dest, src), dest;
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}
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//projects a point
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void g3_project_point(g3s_point &point);
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//calculate the depth of a point - returns the z coord of the rotated point
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fix g3_calc_point_depth(const vms_vector &pnt);
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//from a 2d point, compute the vector through that point
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void g3_point_2_vec(vms_vector &v,short sx,short sy);
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//code a point. fills in the p3_codes field of the point, and returns the codes
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ubyte g3_code_point(g3s_point &point);
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//delta rotation functions
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void g3_rotate_delta_vec(vms_vector &dest,const vms_vector &src);
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ubyte g3_add_delta_vec(g3s_point &dest,const g3s_point &src,const vms_vector &deltav);
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//Drawing functions:
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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(uint_fast32_t nv,cg3s_point *const *pointlist, uint8_t color);
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template <std::size_t N>
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static inline void g3_draw_poly(uint_fast32_t nv, const array<cg3s_point *, N> &pointlist, const uint8_t color)
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{
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_g3_draw_poly(nv, &pointlist[0], color);
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}
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template <std::size_t N>
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static inline void g3_draw_poly(const array<cg3s_point *, N> &pointlist, const uint8_t color)
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{
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g3_draw_poly(N, pointlist, color);
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}
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constexpr std::size_t MAX_POINTS_PER_POLY = 25;
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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(unsigned nv, cg3s_point *const *pointlist, const g3s_uvl *uvl_list, const g3s_lrgb *light_rgb, grs_bitmap &bm);
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template <std::size_t N>
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static inline void g3_draw_tmap(unsigned nv, const array<cg3s_point *, N> &pointlist, const array<g3s_uvl, N> &uvl_list, const array<g3s_lrgb, N> &light_rgb, grs_bitmap &bm)
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{
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static_assert(N <= MAX_POINTS_PER_POLY, "too many points in tmap");
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#ifdef DXX_CONSTANT_TRUE
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if (DXX_CONSTANT_TRUE(nv > N))
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DXX_ALWAYS_ERROR_FUNCTION(dxx_trap_tmap_overread, "reading beyond array");
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#endif
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_g3_draw_tmap(nv, &pointlist[0], &uvl_list[0], &light_rgb[0], bm);
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}
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template <std::size_t N>
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static inline void g3_draw_tmap(const array<cg3s_point *, N> &pointlist, const array<g3s_uvl, N> &uvl_list, const array<g3s_lrgb, N> &light_rgb, grs_bitmap &bm)
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{
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g3_draw_tmap(N, pointlist, uvl_list, light_rgb, bm);
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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(g3s_point &pnt,fix rad, uint8_t color);
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//@@//return ligting value for a point
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//@@fix g3_compute_lighting_value(g3s_point *rotated_point,fix normval);
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//like g3_draw_poly(), but checks to see if facing. If surface normal is
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//NULL, this routine must compute it, which will be slow. It is better to
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//pre-compute the normal, and pass it to this function. When the normal
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//is passed, this function works like g3_check_normal_facing() plus
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//g3_draw_poly().
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//returns -1 if not facing, 1 if off screen, 0 if drew
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bool do_facing_check(const array<cg3s_point *, 3> &vertlist);
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//like g3_draw_poly(), but checks to see if facing. If surface normal is
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//NULL, this routine must compute it, which will be slow. It is better to
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//pre-compute the normal, and pass it to this function. When the normal
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//is passed, this function works like g3_check_normal_facing() plus
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//g3_draw_poly().
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//returns -1 if not facing, 1 if off screen, 0 if drew
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static inline void g3_check_and_draw_poly(const array<cg3s_point *, 3> &pointlist, const uint8_t color)
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{
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if (do_facing_check(pointlist))
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g3_draw_poly(pointlist, color);
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}
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template <std::size_t N>
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static inline void g3_check_and_draw_tmap(unsigned nv, const array<cg3s_point *, N> &pointlist, const array<g3s_uvl, N> &uvl_list, const array<g3s_lrgb, N> &light_rgb, grs_bitmap &bm)
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{
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if (do_facing_check(pointlist))
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g3_draw_tmap(nv,pointlist,uvl_list,light_rgb,bm);
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}
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template <std::size_t N>
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static inline void g3_check_and_draw_tmap(const array<cg3s_point *, N> &pointlist, const array<g3s_uvl, N> &uvl_list, const array<g3s_lrgb, N> &light_rgb, grs_bitmap &bm)
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{
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g3_check_and_draw_tmap(N, pointlist, uvl_list, light_rgb, bm);
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}
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//draws a line. takes two points.
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struct temporary_points_t;
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void g3_draw_line(cg3s_point &p0,cg3s_point &p1, uint8_t color);
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void g3_draw_line(cg3s_point &p0,cg3s_point &p1, uint8_t color,temporary_points_t &);
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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_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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//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(const vms_vector &pos,fix width,fix height,grs_bitmap &bm);
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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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#ifdef OGL
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enum class tmap_drawer_constant : uint_fast8_t
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{
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polygon,
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flat,
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};
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#define draw_tmap tmap_drawer_constant::polygon
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#define draw_tmap_flat tmap_drawer_constant::flat
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class tmap_drawer_type
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{
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tmap_drawer_constant type;
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public:
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constexpr tmap_drawer_type(tmap_drawer_constant t) : type(t)
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{
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}
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bool operator==(tmap_drawer_constant t) const
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{
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return type == t;
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}
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bool operator!=(tmap_drawer_constant t) const
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{
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return type != t;
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}
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};
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#else
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constexpr std::size_t MAX_POINTS_IN_POLY = 100;
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typedef void (*tmap_drawer_type)(const grs_bitmap &bm,uint_fast32_t nv,const g3s_point *const *vertlist);
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// This is the gr_upoly-like interface to the texture mapper which uses texture-mapper compatible
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// (ie, avoids cracking) edge/delta computation.
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void gr_upoly_tmap(uint_fast32_t nverts, const array<fix, MAX_POINTS_IN_POLY*2> &vert, uint8_t color);
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#endif
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void g3_set_special_render(tmap_drawer_type tmap_drawer);
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extern tmap_drawer_type tmap_drawer_ptr;
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}
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#endif
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