490 lines
11 KiB
C
490 lines
11 KiB
C
/* $Id: terrain.c,v 1.5 2004-08-28 23:17:45 schaffner Exp $ */
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/*
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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 1993-1999 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
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*/
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/*
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*
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* Code to render cool external-scene terrain
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <conf.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "3d.h"
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#include "error.h"
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#include "gr.h"
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#include "texmap.h"
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#include "iff.h"
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#include "u_mem.h"
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#include "mono.h"
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#include "inferno.h"
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#include "textures.h"
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#include "object.h"
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#include "endlevel.h"
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#include "fireball.h"
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#include "render.h"
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#define GRID_MAX_SIZE 64
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#define GRID_SCALE i2f(2*20)
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#define HEIGHT_SCALE f1_0
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int grid_w,grid_h;
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g3s_uvl uvl_list1[] = { {0,0,0}, {f1_0,0,0}, {0,f1_0,0} };
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g3s_uvl uvl_list2[] = { {f1_0,0,0}, {f1_0,f1_0,0}, {0,f1_0,0} };
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ubyte *height_array;
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ubyte *light_array;
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#define HEIGHT(_i,_j) (height_array[(_i)*grid_w+(_j)])
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#define LIGHT(_i,_j) light_array[(_i)*grid_w+(_j)]
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//!!#define HEIGHT(_i,_j) height_array[(grid_h-1-j)*grid_w+(_i)]
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//!!#define LIGHT(_i,_j) light_array[(grid_h-1-j)*grid_w+(_i)]
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#define LIGHTVAL(_i,_j) (((fix) LIGHT(_i,_j))<<8)
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g3s_point save_row[GRID_MAX_SIZE];
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vms_vector start_point;
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grs_bitmap *terrain_bm;
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int terrain_outline=0;
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int org_i,org_j;
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int mine_tiles_drawn; //flags to tell if all 4 tiles under mine have drawn
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// LINT: adding function prototypes
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void build_light_table(void);
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void free_light_table(void);
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// ------------------------------------------------------------------------
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void draw_cell(int i,int j,g3s_point *p0,g3s_point *p1,g3s_point *p2,g3s_point *p3)
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{
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g3s_point *pointlist[3];
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pointlist[0] = p0;
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pointlist[1] = p1;
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pointlist[2] = p3;
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uvl_list1[0].l = LIGHTVAL(i,j);
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uvl_list1[1].l = LIGHTVAL(i,j+1);
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uvl_list1[2].l = LIGHTVAL(i+1,j);
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uvl_list1[0].u = (i)*f1_0/4; uvl_list1[0].v = (j)*f1_0/4;
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uvl_list1[1].u = (i)*f1_0/4; uvl_list1[1].v = (j+1)*f1_0/4;
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uvl_list1[2].u = (i+1)*f1_0/4; uvl_list1[2].v = (j)*f1_0/4;
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g3_check_and_draw_tmap(3,pointlist,uvl_list1,terrain_bm,NULL,NULL);
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if (terrain_outline) {
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int lsave=Lighting_on;
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Lighting_on=0;
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gr_setcolor(BM_XRGB(31,0,0));
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g3_draw_line(pointlist[0],pointlist[1]);
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g3_draw_line(pointlist[2],pointlist[0]);
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Lighting_on=lsave;
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}
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pointlist[0] = p1;
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pointlist[1] = p2;
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uvl_list2[0].l = LIGHTVAL(i,j+1);
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uvl_list2[1].l = LIGHTVAL(i+1,j+1);
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uvl_list2[2].l = LIGHTVAL(i+1,j);
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uvl_list2[0].u = (i)*f1_0/4; uvl_list2[0].v = (j+1)*f1_0/4;
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uvl_list2[1].u = (i+1)*f1_0/4; uvl_list2[1].v = (j+1)*f1_0/4;
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uvl_list2[2].u = (i+1)*f1_0/4; uvl_list2[2].v = (j)*f1_0/4;
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g3_check_and_draw_tmap(3,pointlist,uvl_list2,terrain_bm,NULL,NULL);
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if (terrain_outline) {
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int lsave=Lighting_on;
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Lighting_on=0;
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gr_setcolor(BM_XRGB(31,0,0));
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g3_draw_line(pointlist[0],pointlist[1]);
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g3_draw_line(pointlist[1],pointlist[2]);
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g3_draw_line(pointlist[2],pointlist[0]);
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Lighting_on=lsave;
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}
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if (i==org_i && j==org_j)
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mine_tiles_drawn |= 1;
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if (i==org_i-1 && j==org_j)
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mine_tiles_drawn |= 2;
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if (i==org_i && j==org_j-1)
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mine_tiles_drawn |= 4;
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if (i==org_i-1 && j==org_j-1)
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mine_tiles_drawn |= 8;
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if (mine_tiles_drawn == 0xf) {
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render_mine(exit_segnum, 0, 0);
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//draw_exit_model();
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mine_tiles_drawn=-1;
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//if (ext_expl_playing)
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// draw_fireball(&external_explosion);
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}
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}
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vms_vector y_cache[256];
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ubyte yc_flags[256];
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extern vms_matrix surface_orient;
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vms_vector *get_dy_vec(int h)
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{
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vms_vector *dyp;
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dyp = &y_cache[h];
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if (!yc_flags[h]) {
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vms_vector tv;
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//@@g3_rotate_delta_y(dyp,h*HEIGHT_SCALE);
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vm_vec_copy_scale(&tv,&surface_orient.uvec,h*HEIGHT_SCALE);
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g3_rotate_delta_vec(dyp,&tv);
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yc_flags[h] = 1;
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}
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return dyp;
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}
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int im=1;
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void render_terrain(vms_vector *org_point,int org_2dx,int org_2dy)
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{
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vms_vector delta_i,delta_j; //delta_y;
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g3s_point p,last_p,save_p_low,save_p_high;
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g3s_point last_p2;
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int i,j;
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int low_i,high_i,low_j,high_j;
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int viewer_i,viewer_j;
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vms_vector tv;
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mine_tiles_drawn = 0; //clear flags
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org_i = org_2dy;
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org_j = org_2dx;
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low_i = 0; high_i = grid_w-1;
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low_j = 0; high_j = grid_h-1;
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//@@start_point.x = org_point->x - GRID_SCALE*(org_i - low_i);
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//@@start_point.z = org_point->z - GRID_SCALE*(org_j - low_j);
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//@@start_point.y = org_point->y;
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memset(yc_flags,0,256);
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//Lighting_on = 0;
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Interpolation_method = im;
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vm_vec_copy_scale(&tv,&surface_orient.rvec,GRID_SCALE);
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g3_rotate_delta_vec(&delta_i,&tv);
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vm_vec_copy_scale(&tv,&surface_orient.fvec,GRID_SCALE);
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g3_rotate_delta_vec(&delta_j,&tv);
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vm_vec_scale_add(&start_point,org_point,&surface_orient.rvec,-(org_i - low_i)*GRID_SCALE);
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vm_vec_scale_add2(&start_point,&surface_orient.fvec,-(org_j - low_j)*GRID_SCALE);
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vm_vec_sub(&tv,&Viewer->pos,&start_point);
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viewer_i = vm_vec_dot(&tv,&surface_orient.rvec) / GRID_SCALE;
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viewer_j = vm_vec_dot(&tv,&surface_orient.fvec) / GRID_SCALE;
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//mprintf((0,"viewer_i,j = %d,%d\n",viewer_i,viewer_j));
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g3_rotate_point(&last_p,&start_point);
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save_p_low = last_p;
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for (j=low_j;j<=high_j;j++) {
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g3_add_delta_vec(&save_row[j],&last_p,get_dy_vec(HEIGHT(low_i,j)));
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if (j==high_j)
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save_p_high = last_p;
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else
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g3_add_delta_vec(&last_p,&last_p,&delta_j);
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}
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for (i=low_i;i<viewer_i;i++) {
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g3_add_delta_vec(&save_p_low,&save_p_low,&delta_i);
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last_p = save_p_low;
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g3_add_delta_vec(&last_p2,&last_p,get_dy_vec(HEIGHT(i+1,low_j)));
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for (j=low_j;j<viewer_j;j++) {
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g3s_point p2;
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g3_add_delta_vec(&p,&last_p,&delta_j);
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g3_add_delta_vec(&p2,&p,get_dy_vec(HEIGHT(i+1,j+1)));
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draw_cell(i,j,&save_row[j],&save_row[j+1],&p2,&last_p2);
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last_p = p;
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save_row[j] = last_p2;
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last_p2 = p2;
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}
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vm_vec_negate(&delta_j); //don't have a delta sub...
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g3_add_delta_vec(&save_p_high,&save_p_high,&delta_i);
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last_p = save_p_high;
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g3_add_delta_vec(&last_p2,&last_p,get_dy_vec(HEIGHT(i+1,high_j)));
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for (j=high_j-1;j>=viewer_j;j--) {
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g3s_point p2;
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g3_add_delta_vec(&p,&last_p,&delta_j);
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g3_add_delta_vec(&p2,&p,get_dy_vec(HEIGHT(i+1,j)));
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draw_cell(i,j,&save_row[j],&save_row[j+1],&last_p2,&p2);
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last_p = p;
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save_row[j+1] = last_p2;
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last_p2 = p2;
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}
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save_row[j+1] = last_p2;
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vm_vec_negate(&delta_j); //restore sign of j
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}
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//now do i from other end
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vm_vec_negate(&delta_i); //going the other way now...
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//@@start_point.x += (high_i-low_i)*GRID_SCALE;
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vm_vec_scale_add2(&start_point,&surface_orient.rvec,(high_i-low_i)*GRID_SCALE);
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g3_rotate_point(&last_p,&start_point);
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save_p_low = last_p;
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for (j=low_j;j<=high_j;j++) {
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g3_add_delta_vec(&save_row[j],&last_p,get_dy_vec(HEIGHT(high_i,j)));
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if (j==high_j)
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save_p_high = last_p;
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else
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g3_add_delta_vec(&last_p,&last_p,&delta_j);
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}
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for (i=high_i-1;i>=viewer_i;i--) {
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g3_add_delta_vec(&save_p_low,&save_p_low,&delta_i);
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last_p = save_p_low;
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g3_add_delta_vec(&last_p2,&last_p,get_dy_vec(HEIGHT(i,low_j)));
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for (j=low_j;j<viewer_j;j++) {
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g3s_point p2;
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g3_add_delta_vec(&p,&last_p,&delta_j);
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g3_add_delta_vec(&p2,&p,get_dy_vec(HEIGHT(i,j+1)));
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draw_cell(i,j,&last_p2,&p2,&save_row[j+1],&save_row[j]);
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last_p = p;
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save_row[j] = last_p2;
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last_p2 = p2;
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}
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vm_vec_negate(&delta_j); //don't have a delta sub...
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g3_add_delta_vec(&save_p_high,&save_p_high,&delta_i);
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last_p = save_p_high;
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g3_add_delta_vec(&last_p2,&last_p,get_dy_vec(HEIGHT(i,high_j)));
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for (j=high_j-1;j>=viewer_j;j--) {
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g3s_point p2;
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g3_add_delta_vec(&p,&last_p,&delta_j);
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g3_add_delta_vec(&p2,&p,get_dy_vec(HEIGHT(i,j)));
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draw_cell(i,j,&p2,&last_p2,&save_row[j+1],&save_row[j]);
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last_p = p;
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save_row[j+1] = last_p2;
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last_p2 = p2;
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}
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save_row[j+1] = last_p2;
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vm_vec_negate(&delta_j); //restore sign of j
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}
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}
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void free_height_array()
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{
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d_free(height_array);
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}
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void load_terrain(char *filename)
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{
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grs_bitmap height_bitmap;
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int iff_error;
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int i,j;
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ubyte h,min_h,max_h;
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iff_error = iff_read_bitmap(filename,&height_bitmap,BM_LINEAR,NULL);
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if (iff_error != IFF_NO_ERROR) {
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mprintf((1, "File %s - IFF error: %s",filename,iff_errormsg(iff_error)));
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Error("File %s - IFF error: %s",filename,iff_errormsg(iff_error));
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}
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if (height_array)
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d_free(height_array);
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else
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atexit(free_height_array); //first time
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grid_w = height_bitmap.bm_w;
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grid_h = height_bitmap.bm_h;
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Assert(grid_w <= GRID_MAX_SIZE);
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Assert(grid_h <= GRID_MAX_SIZE);
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height_array = height_bitmap.bm_data;
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max_h=0; min_h=255;
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for (i=0;i<grid_w;i++)
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for (j=0;j<grid_h;j++) {
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h = HEIGHT(i,j);
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if (h > max_h)
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max_h = h;
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if (h < min_h)
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min_h = h;
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}
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for (i=0;i<grid_w;i++)
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for (j=0;j<grid_h;j++)
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HEIGHT(i,j) -= min_h;
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// d_free(height_bitmap.bm_data);
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terrain_bm = terrain_bitmap;
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build_light_table();
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}
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void get_pnt(vms_vector *p,int i,int j)
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{
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p->x = GRID_SCALE*i;
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p->z = GRID_SCALE*j;
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p->y = HEIGHT(i,j)*HEIGHT_SCALE;
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}
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vms_vector light = {0x2e14,0xe8f5,0x5eb8};
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fix get_face_light(vms_vector *p0,vms_vector *p1,vms_vector *p2)
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{
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vms_vector norm;
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vm_vec_normal(&norm,p0,p1,p2);
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return -vm_vec_dot(&norm,&light);
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}
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fix get_avg_light(int i,int j)
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{
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vms_vector pp,p[6];
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fix sum;
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int f;
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get_pnt(&pp,i,j);
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get_pnt(&p[0],i-1,j);
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get_pnt(&p[1],i,j-1);
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get_pnt(&p[2],i+1,j-1);
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get_pnt(&p[3],i+1,j);
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get_pnt(&p[4],i,j+1);
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get_pnt(&p[5],i-1,j+1);
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for (f=0,sum=0;f<6;f++)
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sum += get_face_light(&pp,&p[f],&p[(f+1)%5]);
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return sum/6;
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}
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void free_light_table()
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{
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if (light_array)
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d_free(light_array);
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}
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void build_light_table()
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{
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int i,j;
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fix l,l2,min_l=0x7fffffff,max_l=0;
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if (light_array)
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d_free(light_array);
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else
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atexit(free_light_table); //first time
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MALLOC(light_array,ubyte,grid_w*grid_h);
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for (i=1;i<grid_w;i++)
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for (j=1;j<grid_h;j++) {
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l = get_avg_light(i,j);
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if (l > max_l)
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max_l = l;
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if (l < min_l)
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min_l = l;
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//printf("light %2d,%2d = %8x\n",i,j,l);
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}
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for (i=1;i<grid_w;i++)
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for (j=1;j<grid_h;j++) {
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l = get_avg_light(i,j);
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if (min_l == max_l) {
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LIGHT(i,j) = l>>8;
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continue;
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}
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|
|
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l2 = fixdiv((l-min_l),(max_l-min_l));
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|
|
|
if (l2==f1_0)
|
|
l2--;
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|
|
|
LIGHT(i,j) = l2>>8;
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|
|
|
//printf("light %2d,%2d = %4x\n",i,j,l2>>8);
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|
|
|
}
|
|
}
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