1 /* $Id: interp.c,v 1.5 2002-07-17 21:55:19 bradleyb Exp $ */
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12 COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
16 * Polygon object interpreter
20 * Revision 1.4 1995/10/10 22:20:09 allender
21 * new morphing code from Matt
23 * Revision 1.3 1995/08/31 15:40:24 allender
24 * swap color data correctly
26 * Revision 1.2 1995/05/11 13:06:38 allender
27 * fix int --> short problem
29 * Revision 1.1 1995/05/05 08:51:41 allender
32 * Revision 1.1 1995/04/17 06:44:33 matt
43 static char rcsid[] = "$Id: interp.c,v 1.5 2002-07-17 21:55:19 bradleyb Exp $";
53 #define OP_EOF 0 //eof
54 #define OP_DEFPOINTS 1 //defpoints
55 #define OP_FLATPOLY 2 //flat-shaded polygon
56 #define OP_TMAPPOLY 3 //texture-mapped polygon
57 #define OP_SORTNORM 4 //sort by normal
58 #define OP_RODBM 5 //rod bitmap
59 #define OP_SUBCALL 6 //call a subobject
60 #define OP_DEFP_START 7 //defpoints with start
61 #define OP_GLOW 8 //glow value for next poly
63 #define N_OPCODES (sizeof(opcode_table) / sizeof(*opcode_table))
65 #define MAX_POINTS_PER_POLY 25
67 short highest_texture_num;
68 int g3d_interp_outline;
70 g3s_point *Interp_point_list=NULL;
72 #define MAX_INTERP_COLORS 100
74 //this is a table of mappings from RGB15 to palette colors
75 struct {short pal_entry,rgb15;} interp_color_table[MAX_INTERP_COLORS];
77 int n_interp_colors=0;
79 //gives the interpreter an array of points to use
80 void g3_set_interp_points(g3s_point *pointlist)
82 Interp_point_list = pointlist;
85 #define w(p) (*((short *) (p)))
86 #define wp(p) ((short *) (p))
87 #define vp(p) ((vms_vector *) (p))
89 void rotate_point_list(g3s_point *dest,vms_vector *src,int n)
92 g3_rotate_point(dest++,src++);
95 vms_angvec zero_angles = {0,0,0};
97 g3s_point *point_list[MAX_POINTS_PER_POLY];
101 //calls the object interpreter to render an object. The object renderer
102 //is really a seperate pipeline. returns true if drew
103 bool g3_draw_polygon_model(void *model_ptr,grs_bitmap **model_bitmaps,vms_angvec *anim_angles,fix model_light,fix *glow_values)
105 ubyte *p = model_ptr;
107 glow_num = -1; //glow off by default
109 while (w(p) != OP_EOF)
116 rotate_point_list(Interp_point_list,vp(p+4),n);
117 p += n*sizeof(struct vms_vector) + 4;
122 case OP_DEFP_START: {
126 rotate_point_list(&Interp_point_list[s],vp(p+8),n);
127 p += n*sizeof(struct vms_vector) + 8;
135 Assert( nv < MAX_POINTS_PER_POLY );
136 if (g3_check_normal_facing(vp(p+4),vp(p+16)) > 0) {
142 // DPH: Now we treat this color as 15bpp
143 // gr_setcolor(w(p+28));
145 //l = (32 * model_light) >> 16;
146 l = f2i(fixmul(i2f(32), model_light));
148 else if (l>32) l = 32;
149 cc = gr_find_closest_color_15bpp(w(p+28));
150 c = gr_fade_table[(l<<8)|cc];
154 point_list[i] = Interp_point_list + wp(p+30)[i];
156 g3_draw_poly(nv,point_list);
159 p += 30 + ((nv&~1)+1)*2;
168 Assert( nv < MAX_POINTS_PER_POLY );
169 if (g3_check_normal_facing(vp(p+4),vp(p+16)) > 0) {
173 //calculate light from surface normal
175 if (glow_num < 0) { //no glow
177 light = -vm_vec_dot(&View_matrix.fvec,vp(p+16));
178 light = f1_0/4 + (light*3)/4;
179 light = fixmul(light,model_light);
182 light = glow_values[glow_num];
186 //now poke light into l values
188 uvl_list = (g3s_uvl *) (p+30+((nv&~1)+1)*2);
191 uvl_list[i].l = light;
194 point_list[i] = Interp_point_list + wp(p+30)[i];
196 g3_draw_tmap(nv,point_list,uvl_list,model_bitmaps[w(p+28)]);
199 p += 30 + ((nv&~1)+1)*2 + nv*12;
206 if (g3_check_normal_facing(vp(p+16),vp(p+4)) > 0) { //facing
208 //draw back then front
210 g3_draw_polygon_model(p+w(p+30),model_bitmaps,anim_angles,model_light,glow_values);
211 g3_draw_polygon_model(p+w(p+28),model_bitmaps,anim_angles,model_light,glow_values);
214 else { //not facing. draw front then back
216 g3_draw_polygon_model(p+w(p+28),model_bitmaps,anim_angles,model_light,glow_values);
217 g3_draw_polygon_model(p+w(p+30),model_bitmaps,anim_angles,model_light,glow_values);
226 g3s_point rod_bot_p,rod_top_p;
228 g3_rotate_point(&rod_bot_p,vp(p+20));
229 g3_rotate_point(&rod_top_p,vp(p+4));
231 g3_draw_rod_tmap(model_bitmaps[w(p+2)],&rod_bot_p,w(p+16),&rod_top_p,w(p+32),f1_0);
241 a = &anim_angles[w(p+2)];
245 g3_start_instance_angles(vp(p+4),a);
247 g3_draw_polygon_model(p+w(p+16),model_bitmaps,anim_angles,model_light,glow_values);
270 extern int gr_find_closest_color_15bpp( int rgb );
276 //alternate interpreter for morphing object
277 bool g3_draw_morphing_model(void *model_ptr,grs_bitmap **model_bitmaps,vms_angvec *anim_angles,fix model_light,vms_vector *new_points)
279 ubyte *p = model_ptr;
280 fix *glow_values = NULL;
282 glow_num = -1; //glow off by default
284 while (w(p) != OP_EOF)
291 rotate_point_list(Interp_point_list,new_points,n);
292 p += n*sizeof(struct vms_vector) + 4;
297 case OP_DEFP_START: {
301 rotate_point_list(&Interp_point_list[s],new_points,n);
302 p += n*sizeof(struct vms_vector) + 8;
311 gr_setcolor(w(p+28));
314 point_list[i] = Interp_point_list + wp(p+30)[i];
316 for (ntris=nv-2;ntris;ntris--) {
318 point_list[2] = Interp_point_list + wp(p+30)[i++];
320 g3_check_and_draw_poly(3,point_list,NULL,NULL);
322 point_list[1] = point_list[2];
326 p += 30 + ((nv&~1)+1)*2;
334 g3s_uvl morph_uvls[3];
338 //calculate light from surface normal
340 if (glow_num < 0) { //no glow
342 light = -vm_vec_dot(&View_matrix.fvec,vp(p+16));
343 light = f1_0/4 + (light*3)/4;
344 light = fixmul(light,model_light);
347 light = glow_values[glow_num];
351 //now poke light into l values
353 uvl_list = (g3s_uvl *) (p+30+((nv&~1)+1)*2);
356 morph_uvls[i].l = light;
359 point_list[i] = Interp_point_list + wp(p+30)[i];
361 morph_uvls[i].u = uvl_list[i].u;
362 morph_uvls[i].v = uvl_list[i].v;
365 for (ntris=nv-2;ntris;ntris--) {
367 point_list[2] = Interp_point_list + wp(p+30)[i];
368 morph_uvls[2].u = uvl_list[i].u;
369 morph_uvls[2].v = uvl_list[i].v;
372 g3_check_and_draw_tmap(3,point_list,uvl_list,model_bitmaps[w(p+28)],NULL,NULL);
374 point_list[1] = point_list[2];
375 morph_uvls[1].u = morph_uvls[2].u;
376 morph_uvls[1].v = morph_uvls[2].v;
380 p += 30 + ((nv&~1)+1)*2 + nv*12;
387 if (g3_check_normal_facing(vp(p+16),vp(p+4)) > 0) { //facing
389 //draw back then front
391 g3_draw_morphing_model(p+w(p+30),model_bitmaps,anim_angles,model_light,new_points);
392 g3_draw_morphing_model(p+w(p+28),model_bitmaps,anim_angles,model_light,new_points);
395 else { //not facing. draw front then back
397 g3_draw_morphing_model(p+w(p+28),model_bitmaps,anim_angles,model_light,new_points);
398 g3_draw_morphing_model(p+w(p+30),model_bitmaps,anim_angles,model_light,new_points);
407 g3s_point rod_bot_p,rod_top_p;
409 g3_rotate_point(&rod_bot_p,vp(p+20));
410 g3_rotate_point(&rod_top_p,vp(p+4));
412 g3_draw_rod_tmap(model_bitmaps[w(p+2)],&rod_bot_p,w(p+16),&rod_top_p,w(p+32),f1_0);
422 a = &anim_angles[w(p+2)];
426 g3_start_instance_angles(vp(p+4),a);
428 g3_draw_polygon_model(p+w(p+16),model_bitmaps,anim_angles,model_light,glow_values);
449 void init_model_sub(ubyte *p)
451 Assert(++nest_count < 1000);
453 while (w(p) != OP_EOF) {
459 p += n*sizeof(struct vms_vector) + 4;
463 case OP_DEFP_START: {
465 p += n*sizeof(struct vms_vector) + 8;
472 Assert(nv > 2); //must have 3 or more points
474 // *wp(p+28) = (short)gr_find_closest_color_15bpp(w(p+28));
476 p += 30 + ((nv&~1)+1)*2;
484 Assert(nv > 2); //must have 3 or more points
486 if (w(p+28) > highest_texture_num)
487 highest_texture_num = w(p+28);
489 p += 30 + ((nv&~1)+1)*2 + nv*12;
496 init_model_sub(p+w(p+28));
497 init_model_sub(p+w(p+30));
509 init_model_sub(p+w(p+16));
524 //init code for bitmap models
525 void g3_init_polygon_model(void *model_ptr)
531 highest_texture_num = -1;
533 init_model_sub((ubyte *) model_ptr);