2 * $Logfile: /Freespace2/code/Starfield/Nebula.cpp $
7 * Code to load & display nebulas
10 * Revision 1.2 2002/05/04 04:36:56 theoddone33
11 * More changes, took out a lot of the sound/* stuff which will bite later but
14 * Revision 1.1.1.1 2002/05/03 03:28:10 root
18 * 14 9/01/99 11:26p Dave
19 * Fixed release build warnings.
21 * 13 8/30/99 5:01p Dave
22 * Made d3d do less state changing in the nebula. Use new chat server for
25 * 12 7/29/99 10:47p Dave
26 * Standardized D3D fogging using vertex fog. Shook out Savage 4 bugs.
28 * 11 7/14/99 9:42a Dave
29 * Put in clear_color debug function. Put in base for 3dnow stuff / P3
32 * 10 6/22/99 7:03p Dave
33 * New detail options screen.
35 * 9 3/31/99 8:24p Dave
36 * Beefed up all kinds of stuff, incluging beam weapons, nebula effects
37 * and background nebulae. Added per-ship non-dimming pixel colors.
39 * 8 12/09/98 7:34p Dave
40 * Cleanup up nebula effect. Tweaked many values.
42 * 7 12/08/98 9:36a Dave
43 * Almost done nebula effect for D3D. Looks 85% as good as Glide.
45 * 6 12/07/98 5:51p Dave
46 * Finally got d3d fog working! Now we just need to tweak values.
48 * 5 12/06/98 2:36p Dave
49 * Drastically improved nebula fogging.
51 * 4 11/14/98 5:33p Dave
52 * Lots of nebula work. Put in ship contrails.
54 * 3 11/11/98 5:37p Dave
55 * Checkin for multiplayer testing.
57 * 2 10/07/98 10:54a Dave
60 * 1 10/07/98 10:51a Dave
62 * 15 5/13/98 2:53p John
63 * Made subspace effect work under software. Had to add new inner loop to
64 * tmapper. Added glows to end of subspace effect. Made subspace effect
65 * levels use gamepalette-subspace palette.
67 * 14 4/10/98 5:20p John
68 * Changed RGB in lighting structure to be ubytes. Removed old
69 * not-necessary 24 bpp software stuff.
71 * 13 3/22/98 11:02a John
72 * Made a bunch of the detail levels actually do something
74 * 12 2/22/98 12:19p John
75 * Externalized some strings
77 * 11 1/23/98 5:08p John
78 * Took L out of vertex structure used B (blue) instead. Took all small
79 * fireballs out of fireball types and used particles instead. Fixed some
80 * debris explosion things. Restructured fireball code. Restructured
81 * some lighting code. Made dynamic lighting on by default. Made groups
82 * of lasers only cast one light. Made fireballs not cast light.
84 * 10 1/10/98 1:14p John
85 * Added explanation to debug console commands
87 * 9 12/21/97 4:33p John
88 * Made debug console functions a class that registers itself
89 * automatically, so you don't need to add the function to
92 * 8 11/25/97 11:40a Hoffoss
93 * Added support for nebula placement editing.
95 * 7 11/24/97 12:04p John
97 * 6 11/21/97 2:55p Hoffoss
98 * Added Nebula support to Fred. Implemented loading and saving nebula
99 * info to/from mission files.
101 * 5 11/21/97 11:32a John
102 * Added nebulas. Fixed some warpout bugs.
104 * 4 11/19/97 10:47p Adam
105 * upped MAX_TRIS to 200. Whaddya think this is, I-War?
107 * 3 11/16/97 2:41p John
108 * added a debug function to load a nebula into the game.
110 * 2 11/16/97 2:29p John
111 * added versioning to nebulas; put nebula code into freespace.
113 * 1 11/16/97 1:14p John
119 #include "floating.h"
123 #include "starfield.h"
126 #include "freespace.h"
131 #include "linklist.h"
133 #include "missionparse.h"
137 #define MAX_POINTS 300
139 static int neb_w = 0, neb_h = 0;
141 static int nebula_inited = 0;
142 static int num_pts = 0;
144 static vector nebula_vecs[MAX_POINTS];
145 static vertex nebula_verts[MAX_POINTS];
147 static float scale_factor = 1.0f;
149 static int num_tris = 0;
150 static int tri[MAX_TRIS][3];
152 static int Nebula_loaded = 0;
153 static angles Nebula_pbh;
154 static matrix Nebula_orient;
162 if (!Nebula_loaded) return;
167 #define NEBULA_FILE_ID NOX("NEBU")
168 #define NEBULA_MAJOR_VERSION 1 // Can be 1-?
169 #define NEBULA_MINOR_VERSION 0 // Can be 0-99
174 void project_2d_onto_sphere( vector *pnt, float u, float v )
178 a = PI * (2.0f * u - 1.0f );
180 s = scale_factor * fl_sqrt( 1.0f - z*z );
181 x = s * (float)cos(a);
182 y = s * (float)sin(a);
188 // Version 199 mean major version=1, minor=99.
189 // Changing major means no longer compatible.
191 // 1.00 - initial version
193 // returns 0 if failed
194 int load_nebula_sub(char *filename)
198 int version, major, minor;
200 fp = cfopen(filename, "rb");
207 cfread( id, 4, 1, fp );
208 if ( strncmp( id, NEBULA_FILE_ID, 4)) {
209 mprintf(( "Not a valid nebula file.\n" ));
212 cfread( &version, sizeof(int), 1, fp );
213 major = version / 100;
214 minor = version % 100;
216 if ( major != NEBULA_MAJOR_VERSION ) {
217 mprintf(( "An out of date nebula file.\n" ));
221 cfread( &num_pts, sizeof(int), 1, fp );
222 Assert( num_pts < MAX_POINTS );
223 cfread( &num_tris, sizeof(int), 1, fp );
224 Assert( num_tris < MAX_TRIS );
226 for (int i=0; i<num_pts; i++ ) {
230 cfread( &xf, sizeof(float), 1, fp );
231 cfread( &yf, sizeof(float), 1, fp );
232 cfread( &l, sizeof(int), 1, fp );
233 project_2d_onto_sphere( &nebula_vecs[i], 1.0f - xf, yf );
234 vm_vec_scale( &nebula_vecs[i], 10.0f );
235 nebula_verts[i].b = ubyte((l*255)/31);
237 // throw in some randomness to the nebula vertices depth
240 for (int i=0; i<num_tris; i++ ) {
241 cfread( &tri[i][0], sizeof(int), 1, fp );
242 cfread( &tri[i][1], sizeof(int), 1, fp );
243 cfread( &tri[i][2], sizeof(int), 1, fp );
251 void nebula_init( char *filename, int pitch, int bank, int heading )
255 a.p = ANG_TO_RAD((float) pitch);
256 a.b = ANG_TO_RAD((float) bank);
257 a.h = ANG_TO_RAD((float) heading);
258 nebula_init(filename, &a);
261 void nebula_init( char *filename, angles * pbh )
263 if ( Nebula_loaded ) {
267 if ( load_nebula_sub( cf_add_ext(filename, NOX(".neb")) ) ) {
273 vm_angles_2_matrix(&Nebula_orient, &Nebula_pbh );
279 Nebula_orient = vmd_identity_matrix;
288 // no nebula for you!
291 if ( !Nebula_loaded ) {
295 if ( !Detail.planets_suns ) {
299 // Rotate the nebula.
300 g3_start_instance_matrix( NULL, &Nebula_orient );
302 for (i=0; i<num_pts; i++ ) {
303 g3_rotate_faraway_vertex( &nebula_verts[i], &nebula_vecs[i] );
304 g3_project_vertex( &nebula_verts[i] );
307 int saved_gr_zbuffering = gr_zbuffer_get();
309 gr_zbuffer_set(GR_ZBUFF_NONE);
311 for (i=0; i<num_tris; i++ ) {
315 verts[0] = &nebula_verts[tri[i][0]];
316 verts[1] = &nebula_verts[tri[i][1]];
317 verts[2] = &nebula_verts[tri[i][2]];
319 g3_draw_poly(3, verts, TMAP_FLAG_RAMP | TMAP_FLAG_GOURAUD | TMAP_FLAG_NEBULA );
324 gr_zbuffer_set(saved_gr_zbuffering);
326 // always switch off fogging for good measure
327 if((The_mission.flags & MISSION_FLAG_FULLNEB) && (Neb2_render_mode == NEB2_RENDER_NONE)){
328 gr_fog_set(GR_FOGMODE_NONE, 0, 0, 0);
332 DCF(nebula,"Loads a different nebula")
335 dc_get_arg(ARG_STRING|ARG_NONE);
336 if ( Dc_arg_type == ARG_NONE ) {
339 nebula_init( Dc_arg );
343 dc_printf( "Usage: nebula filename\nLoads the nebula file. No filename takes away nebula\n" );