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/*
THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
*/
/*
*
* Polygon object interpreter
*
*/
#include <stdlib.h>
#include "dxxerror.h"
#include "3d.h"
#include "globvars.h"
#include "gr.h"
#include "byteswap.h"
#include "polyobj.h"
#define OP_EOF 0 //eof
#define OP_DEFPOINTS 1 //defpoints
#define OP_FLATPOLY 2 //flat-shaded polygon
#define OP_TMAPPOLY 3 //texture-mapped polygon
#define OP_SORTNORM 4 //sort by normal
#define OP_RODBM 5 //rod bitmap
#define OP_SUBCALL 6 //call a subobject
#define OP_DEFP_START 7 //defpoints with start
#define OP_GLOW 8 //glow value for next poly
#define N_OPCODES (sizeof(opcode_table) / sizeof(*opcode_table))
#define MAX_POINTS_PER_POLY 25
short highest_texture_num;
int g3d_interp_outline;
g3s_point *Interp_point_list = NULL;
#define MAX_INTERP_COLORS 100
//this is a table of mappings from RGB15 to palette colors
struct {short pal_entry,rgb15;} interp_color_table[MAX_INTERP_COLORS];
int n_interp_colors=0;
//gives the interpreter an array of points to use
void g3_set_interp_points(g3s_point *pointlist)
{
Interp_point_list = pointlist;
}
#define w(p) (*((short *) (p)))
#define wp(p) ((short *) (p))
#define fp(p) ((fix *) (p))
#define vp(p) ((vms_vector *) (p))
void rotate_point_list(g3s_point *dest,vms_vector *src,int n)
{
while (n--)
g3_rotate_point(dest++,src++);
}
vms_angvec zero_angles = {0,0,0};
g3s_point *point_list[MAX_POINTS_PER_POLY];
int glow_num = -1;
// check a polymodel for it's color and return it
int g3_poly_get_color(void *model_ptr)
{
ubyte *p = model_ptr;
int color = 0;
while (w(p) != OP_EOF)
switch (w(p)) {
case OP_DEFPOINTS:
p += w(p+2)*sizeof(struct vms_vector) + 4;
break;
case OP_DEFP_START:
p += w(p+2)*sizeof(struct vms_vector) + 8;
break;
case OP_FLATPOLY: {
int nv = w(p+2);
if (g3_check_normal_facing(vp(p+4),vp(p+16)) > 0)
color = (w(p+28));
p += 30 + ((nv&~1)+1)*2;
break;
}
case OP_TMAPPOLY: {
int nv = w(p+2);
p += 30 + ((nv&~1)+1)*2 + nv*12;
break;
}
case OP_SORTNORM:
if (g3_check_normal_facing(vp(p+16),vp(p+4)) > 0) //facing
color = g3_poly_get_color(p+w(p+28));
else //not facing
color = g3_poly_get_color(p+w(p+30));
p += 32;
break;
case OP_RODBM:
p+=36;
break;
case OP_SUBCALL:
color = g3_poly_get_color(p+w(p+16));
p += 20;
break;
case OP_GLOW:
p += 4;
break;
default:
;
}
return color;
}
//calls the object interpreter to render an object. The object renderer
//is really a seperate pipeline. returns true if drew
bool g3_draw_polygon_model(void *model_ptr,grs_bitmap **model_bitmaps,vms_angvec *anim_angles,g3s_lrgb model_light,fix *glow_values)
{
ubyte *p = model_ptr;
glow_num = -1; //glow off by default
while (w(p) != OP_EOF)
switch (w(p)) {
case OP_DEFPOINTS: {
int n = w(p+2);
rotate_point_list(Interp_point_list,vp(p+4),n);
p += n*sizeof(struct vms_vector) + 4;
break;
}
case OP_DEFP_START: {
int n = w(p+2);
int s = w(p+4);
rotate_point_list(&Interp_point_list[s],vp(p+8),n);
p += n*sizeof(struct vms_vector) + 8;
break;
}
case OP_FLATPOLY: {
int nv = w(p+2);
Assert( nv < MAX_POINTS_PER_POLY );
if (g3_check_normal_facing(vp(p+4),vp(p+16)) > 0) {
int i;
gr_setcolor(w(p+28));
for (i=0;i<nv;i++)
point_list[i] = Interp_point_list + wp(p+30)[i];
g3_draw_poly(nv,point_list);
}
p += 30 + ((nv&~1)+1)*2;
break;
}
case OP_TMAPPOLY: {
int nv = w(p+2);
g3s_uvl *uvl_list;
Assert( nv < MAX_POINTS_PER_POLY );
if (g3_check_normal_facing(vp(p+4),vp(p+16)) > 0) {
int i;
g3s_lrgb light, *lrgb_list;
MALLOC(lrgb_list, g3s_lrgb, nv);
//calculate light from surface normal
if (glow_num < 0) //no glow
{
light.r = light.g = light.b = -vm_vec_dot(&View_matrix.fvec,vp(p+16));
light.r = f1_0/4 + (light.r*3)/4;
light.r = fixmul(light.r,model_light.r);
light.g = f1_0/4 + (light.g*3)/4;
light.g = fixmul(light.g,model_light.g);
light.b = f1_0/4 + (light.b*3)/4;
light.b = fixmul(light.b,model_light.b);
}
else //yes glow
{
light.r = light.g = light.b = glow_values[glow_num];
glow_num = -1;
}
//now poke light into l values
uvl_list = (g3s_uvl *) (p+30+((nv&~1)+1)*2);
for (i=0;i<nv;i++)
{
uvl_list[i].l = (light.r+light.g+light.b)/3;
lrgb_list[i].r = light.r;
lrgb_list[i].g = light.g;
lrgb_list[i].b = light.b;
}
for (i=0;i<nv;i++)
point_list[i] = Interp_point_list + wp(p+30)[i];
g3_draw_tmap(nv,point_list,uvl_list,lrgb_list,model_bitmaps[w(p+28)]);
d_free(lrgb_list);
}
p += 30 + ((nv&~1)+1)*2 + nv*12;
break;
}
case OP_SORTNORM:
if (g3_check_normal_facing(vp(p+16),vp(p+4)) > 0) { //facing
//draw back then front
g3_draw_polygon_model(p+w(p+30),model_bitmaps,anim_angles,model_light,glow_values);
g3_draw_polygon_model(p+w(p+28),model_bitmaps,anim_angles,model_light,glow_values);
}
else { //not facing. draw front then back
g3_draw_polygon_model(p+w(p+28),model_bitmaps,anim_angles,model_light,glow_values);
g3_draw_polygon_model(p+w(p+30),model_bitmaps,anim_angles,model_light,glow_values);
}
p += 32;
break;
case OP_RODBM: {
g3s_point rod_bot_p,rod_top_p;
g3s_lrgb rodbm_light = { f1_0, f1_0, f1_0 };
g3_rotate_point(&rod_bot_p,vp(p+20));
g3_rotate_point(&rod_top_p,vp(p+4));
g3_draw_rod_tmap(model_bitmaps[w(p+2)],&rod_bot_p,w(p+16),&rod_top_p,w(p+32),rodbm_light);
p+=36;
break;
}
case OP_SUBCALL: {
vms_angvec *a;
if (anim_angles)
a = &anim_angles[w(p+2)];
else
a = &zero_angles;
g3_start_instance_angles(vp(p+4),a);
g3_draw_polygon_model(p+w(p+16),model_bitmaps,anim_angles,model_light,glow_values);
g3_done_instance();
p += 20;
break;
}
case OP_GLOW:
if (glow_values)
glow_num = w(p+2);
p += 4;
break;
default:
;
}
return 1;
}
#ifndef NDEBUG
int nest_count;
#endif
//alternate interpreter for morphing object
bool g3_draw_morphing_model(void *model_ptr,grs_bitmap **model_bitmaps,vms_angvec *anim_angles,g3s_lrgb model_light,vms_vector *new_points)
{
ubyte *p = model_ptr;
fix *glow_values = NULL;
glow_num = -1; //glow off by default
while (w(p) != OP_EOF)
switch (w(p)) {
case OP_DEFPOINTS: {
int n = w(p+2);
rotate_point_list(Interp_point_list,new_points,n);
p += n*sizeof(struct vms_vector) + 4;
break;
}
case OP_DEFP_START: {
int n = w(p+2);
int s = w(p+4);
rotate_point_list(&Interp_point_list[s],new_points,n);
p += n*sizeof(struct vms_vector) + 8;
break;
}
case OP_FLATPOLY: {
int nv = w(p+2);
int i,ntris;
gr_setcolor(55/*w(p+28)*/);
for (i=0;i<2;i++)
point_list[i] = Interp_point_list + wp(p+30)[i];
for (ntris=nv-2;ntris;ntris--) {
point_list[2] = Interp_point_list + wp(p+30)[i++];
g3_check_and_draw_poly(3,point_list,NULL,NULL);
point_list[1] = point_list[2];
}
p += 30 + ((nv&~1)+1)*2;
break;
}
case OP_TMAPPOLY: {
int nv = w(p+2);
g3s_uvl *uvl_list;
g3s_lrgb light, *lrgb_list;
g3s_uvl morph_uvls[3];
int i,ntris;
MALLOC(lrgb_list, g3s_lrgb, nv);
//calculate light from surface normal
if (glow_num < 0) //no glow
{
light.r = light.g = light.b = -vm_vec_dot(&View_matrix.fvec,vp(p+16));
light.r = f1_0/4 + (light.r*3)/4;
light.r = fixmul(light.r,model_light.r);
light.g = f1_0/4 + (light.g*3)/4;
light.g = fixmul(light.g,model_light.g);
light.b = f1_0/4 + (light.b*3)/4;
light.b = fixmul(light.b,model_light.b);
}
else //yes glow
{
light.r = light.g = light.b = glow_values[glow_num];
glow_num = -1;
}
//now poke light into l values
uvl_list = (g3s_uvl *) (p+30+((nv&~1)+1)*2);
for (i=0;i<nv;i++)
{
lrgb_list[i].r = light.r;
lrgb_list[i].g = light.g;
lrgb_list[i].b = light.b;
}
for (i=0;i<3;i++)
morph_uvls[i].l = (light.r+light.g+light.b)/3;
for (i=0;i<2;i++) {
point_list[i] = Interp_point_list + wp(p+30)[i];
morph_uvls[i].u = uvl_list[i].u;
morph_uvls[i].v = uvl_list[i].v;
}
for (ntris=nv-2;ntris;ntris--) {
point_list[2] = Interp_point_list + wp(p+30)[i];
morph_uvls[2].u = uvl_list[i].u;
morph_uvls[2].v = uvl_list[i].v;
i++;
g3_check_and_draw_tmap(3,point_list,uvl_list,lrgb_list,model_bitmaps[w(p+28)],NULL,NULL);
point_list[1] = point_list[2];
morph_uvls[1].u = morph_uvls[2].u;
morph_uvls[1].v = morph_uvls[2].v;
}
p += 30 + ((nv&~1)+1)*2 + nv*12;
d_free(lrgb_list);
break;
}
case OP_SORTNORM:
if (g3_check_normal_facing(vp(p+16),vp(p+4)) > 0) { //facing
//draw back then front
g3_draw_morphing_model(p+w(p+30),model_bitmaps,anim_angles,model_light,new_points);
g3_draw_morphing_model(p+w(p+28),model_bitmaps,anim_angles,model_light,new_points);
}
else { //not facing. draw front then back
g3_draw_morphing_model(p+w(p+28),model_bitmaps,anim_angles,model_light,new_points);
g3_draw_morphing_model(p+w(p+30),model_bitmaps,anim_angles,model_light,new_points);
}
p += 32;
break;
case OP_RODBM: {
g3s_point rod_bot_p,rod_top_p;
g3s_lrgb rodbm_light = { f1_0, f1_0, f1_0 };
g3_rotate_point(&rod_bot_p,vp(p+20));
g3_rotate_point(&rod_top_p,vp(p+4));
g3_draw_rod_tmap(model_bitmaps[w(p+2)],&rod_bot_p,w(p+16),&rod_top_p,w(p+32),rodbm_light);
p+=36;
break;
}
case OP_SUBCALL: {
vms_angvec *a;
if (anim_angles)
a = &anim_angles[w(p+2)];
else
a = &zero_angles;
g3_start_instance_angles(vp(p+4),a);
g3_draw_polygon_model(p+w(p+16),model_bitmaps,anim_angles,model_light,glow_values);
g3_done_instance();
p += 20;
break;
}
case OP_GLOW:
if (glow_values)
glow_num = w(p+2);
p += 4;
break;
}
return 1;
}
void init_model_sub(ubyte *p)
{
Assert(++nest_count < 1000);
while (w(p) != OP_EOF) {
switch (w(p)) {
case OP_DEFPOINTS: {
int n = w(p+2);
p += n*sizeof(struct vms_vector) + 4;
break;
}
case OP_DEFP_START: {
int n = w(p+2);
p += n*sizeof(struct vms_vector) + 8;
break;
}
case OP_FLATPOLY: {
int nv = w(p+2);
Assert(nv > 2); //must have 3 or more points
*wp(p+28) = (short)gr_find_closest_color_15bpp(w(p+28));
p += 30 + ((nv&~1)+1)*2;
break;
}
case OP_TMAPPOLY: {
int nv = w(p+2);
Assert(nv > 2); //must have 3 or more points
if (w(p+28) > highest_texture_num)
highest_texture_num = w(p+28);
p += 30 + ((nv&~1)+1)*2 + nv*12;
break;
}
case OP_SORTNORM:
init_model_sub(p+w(p+28));
init_model_sub(p+w(p+30));
p += 32;
break;
case OP_RODBM:
p += 36;
break;
case OP_SUBCALL: {
init_model_sub(p+w(p+16));
p += 20;
break;
}
case OP_GLOW:
p += 4;
break;
}
}
}
//init code for bitmap models
void g3_init_polygon_model(void *model_ptr)
{
#ifndef NDEBUG
nest_count = 0;
#endif
highest_texture_num = -1;
init_model_sub((ubyte *) model_ptr);
}
#ifdef WORDS_BIGENDIAN
void short_swap(short *s)
{
*s = SWAPSHORT(*s);
}
void fix_swap(fix *f)
{
*f = (fix)SWAPINT((int)*f);
}
void vms_vector_swap(vms_vector *v)
{
fix_swap(fp(&v->x));
fix_swap(fp(&v->y));
fix_swap(fp(&v->z));
}
void fixang_swap(fixang *f)
{
*f = (fixang)SWAPSHORT((short)*f);
}
void vms_angvec_swap(vms_angvec *v)
{
fixang_swap(&v->p);
fixang_swap(&v->b);
fixang_swap(&v->h);
}
void swap_polygon_model_data(ubyte *data)
{
int i;
short n;
g3s_uvl *uvl_val;
ubyte *p = data;
short_swap(wp(p));
while (w(p) != OP_EOF) {
switch (w(p)) {
case OP_DEFPOINTS:
short_swap(wp(p + 2));
n = w(p+2);
for (i = 0; i < n; i++)
vms_vector_swap(vp((p + 4) + (i * sizeof(vms_vector))));
p += n*sizeof(struct vms_vector) + 4;
break;
case OP_DEFP_START:
short_swap(wp(p + 2));
short_swap(wp(p + 4));
n = w(p+2);
for (i = 0; i < n; i++)
vms_vector_swap(vp((p + 8) + (i * sizeof(vms_vector))));
p += n*sizeof(struct vms_vector) + 8;
break;
case OP_FLATPOLY:
short_swap(wp(p+2));
n = w(p+2);
vms_vector_swap(vp(p + 4));
vms_vector_swap(vp(p + 16));
short_swap(wp(p+28));
for (i=0; i < n; i++)
short_swap(wp(p + 30 + (i * 2)));
p += 30 + ((n&~1)+1)*2;
break;
case OP_TMAPPOLY:
short_swap(wp(p+2));
n = w(p+2);
vms_vector_swap(vp(p + 4));
vms_vector_swap(vp(p + 16));
for (i=0;i<n;i++) {
uvl_val = (g3s_uvl *)((p+30+((n&~1)+1)*2) + (i * sizeof(g3s_uvl)));
fix_swap(&uvl_val->u);
fix_swap(&uvl_val->v);
}
short_swap(wp(p+28));
for (i=0;i<n;i++)
short_swap(wp(p + 30 + (i * 2)));
p += 30 + ((n&~1)+1)*2 + n*12;
break;
case OP_SORTNORM:
vms_vector_swap(vp(p + 4));
vms_vector_swap(vp(p + 16));
short_swap(wp(p + 28));
short_swap(wp(p + 30));
swap_polygon_model_data(p + w(p+28));
swap_polygon_model_data(p + w(p+30));
p += 32;
break;
case OP_RODBM:
vms_vector_swap(vp(p + 20));
vms_vector_swap(vp(p + 4));
short_swap(wp(p+2));
fix_swap(fp(p + 16));
fix_swap(fp(p + 32));
p+=36;
break;
case OP_SUBCALL:
short_swap(wp(p+2));
vms_vector_swap(vp(p+4));
short_swap(wp(p+16));
swap_polygon_model_data(p + w(p+16));
p += 20;
break;
case OP_GLOW:
short_swap(wp(p + 2));
p += 4;
break;
default:
Error("invalid polygon model\n"); //Int3();
}
short_swap(wp(p));
}
}
#endif
#ifdef WORDS_NEED_ALIGNMENT
void add_chunk(ubyte *old_base, ubyte *new_base, int offset,
chunk *chunk_list, int *no_chunks)
{
Assert(*no_chunks + 1 < MAX_CHUNKS); //increase MAX_CHUNKS if you get this
chunk_list[*no_chunks].old_base = old_base;
chunk_list[*no_chunks].new_base = new_base;
chunk_list[*no_chunks].offset = offset;
chunk_list[*no_chunks].correction = 0;
(*no_chunks)++;
}
/*
* finds what chunks the data points to, adds them to the chunk_list,
* and returns the length of the current chunk
*/
int get_chunks(ubyte *data, ubyte *new_data, chunk *list, int *no)
{
short n;
ubyte *p = data;
while (INTEL_SHORT(w(p)) != OP_EOF) {
switch (INTEL_SHORT(w(p))) {
case OP_DEFPOINTS:
n = INTEL_SHORT(w(p+2));
p += n*sizeof(struct vms_vector) + 4;
break;
case OP_DEFP_START:
n = INTEL_SHORT(w(p+2));
p += n*sizeof(struct vms_vector) + 8;
break;
case OP_FLATPOLY:
n = INTEL_SHORT(w(p+2));
p += 30 + ((n&~1)+1)*2;
break;
case OP_TMAPPOLY:
n = INTEL_SHORT(w(p+2));
p += 30 + ((n&~1)+1)*2 + n*12;
break;
case OP_SORTNORM:
add_chunk(p, p - data + new_data, 28, list, no);
add_chunk(p, p - data + new_data, 30, list, no);
p += 32;
break;
case OP_RODBM:
p+=36;
break;
case OP_SUBCALL:
add_chunk(p, p - data + new_data, 16, list, no);
p+=20;
break;
case OP_GLOW:
p += 4;
break;
default:
Error("invalid polygon model\n");
}
}
return p + 2 - data;
}
#endif //def WORDS_NEED_ALIGNMENT
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