2 * $Logfile: /Freespace2/code/Starfield/Nebula.cpp $
7 * Code to load & display nebulas
10 * Revision 1.3 2002/05/26 20:22:48 theoddone33
11 * Most of network/ works
13 * Revision 1.2 2002/05/04 04:36:56 theoddone33
14 * More changes, took out a lot of the sound stuff which will bite later but
17 * Revision 1.1.1.1 2002/05/03 03:28:10 root
21 * 14 9/01/99 11:26p Dave
22 * Fixed release build warnings.
24 * 13 8/30/99 5:01p Dave
25 * Made d3d do less state changing in the nebula. Use new chat server for
28 * 12 7/29/99 10:47p Dave
29 * Standardized D3D fogging using vertex fog. Shook out Savage 4 bugs.
31 * 11 7/14/99 9:42a Dave
32 * Put in clear_color debug function. Put in base for 3dnow stuff / P3
35 * 10 6/22/99 7:03p Dave
36 * New detail options screen.
38 * 9 3/31/99 8:24p Dave
39 * Beefed up all kinds of stuff, incluging beam weapons, nebula effects
40 * and background nebulae. Added per-ship non-dimming pixel colors.
42 * 8 12/09/98 7:34p Dave
43 * Cleanup up nebula effect. Tweaked many values.
45 * 7 12/08/98 9:36a Dave
46 * Almost done nebula effect for D3D. Looks 85% as good as Glide.
48 * 6 12/07/98 5:51p Dave
49 * Finally got d3d fog working! Now we just need to tweak values.
51 * 5 12/06/98 2:36p Dave
52 * Drastically improved nebula fogging.
54 * 4 11/14/98 5:33p Dave
55 * Lots of nebula work. Put in ship contrails.
57 * 3 11/11/98 5:37p Dave
58 * Checkin for multiplayer testing.
60 * 2 10/07/98 10:54a Dave
63 * 1 10/07/98 10:51a Dave
65 * 15 5/13/98 2:53p John
66 * Made subspace effect work under software. Had to add new inner loop to
67 * tmapper. Added glows to end of subspace effect. Made subspace effect
68 * levels use gamepalette-subspace palette.
70 * 14 4/10/98 5:20p John
71 * Changed RGB in lighting structure to be ubytes. Removed old
72 * not-necessary 24 bpp software stuff.
74 * 13 3/22/98 11:02a John
75 * Made a bunch of the detail levels actually do something
77 * 12 2/22/98 12:19p John
78 * Externalized some strings
80 * 11 1/23/98 5:08p John
81 * Took L out of vertex structure used B (blue) instead. Took all small
82 * fireballs out of fireball types and used particles instead. Fixed some
83 * debris explosion things. Restructured fireball code. Restructured
84 * some lighting code. Made dynamic lighting on by default. Made groups
85 * of lasers only cast one light. Made fireballs not cast light.
87 * 10 1/10/98 1:14p John
88 * Added explanation to debug console commands
90 * 9 12/21/97 4:33p John
91 * Made debug console functions a class that registers itself
92 * automatically, so you don't need to add the function to
95 * 8 11/25/97 11:40a Hoffoss
96 * Added support for nebula placement editing.
98 * 7 11/24/97 12:04p John
100 * 6 11/21/97 2:55p Hoffoss
101 * Added Nebula support to Fred. Implemented loading and saving nebula
102 * info to/from mission files.
104 * 5 11/21/97 11:32a John
105 * Added nebulas. Fixed some warpout bugs.
107 * 4 11/19/97 10:47p Adam
108 * upped MAX_TRIS to 200. Whaddya think this is, I-War?
110 * 3 11/16/97 2:41p John
111 * added a debug function to load a nebula into the game.
113 * 2 11/16/97 2:29p John
114 * added versioning to nebulas; put nebula code into freespace.
116 * 1 11/16/97 1:14p John
122 #include "floating.h"
126 #include "starfield.h"
129 #include "freespace.h"
134 #include "linklist.h"
136 #include "missionparse.h"
140 #define MAX_POINTS 300
142 static int neb_w = 0, neb_h = 0;
144 static int nebula_inited = 0;
145 static int num_pts = 0;
147 static vector nebula_vecs[MAX_POINTS];
148 static vertex nebula_verts[MAX_POINTS];
150 static float scale_factor = 1.0f;
152 static int num_tris = 0;
153 static int tri[MAX_TRIS][3];
155 static int Nebula_loaded = 0;
156 static angles Nebula_pbh;
157 static matrix Nebula_orient;
165 if (!Nebula_loaded) return;
170 #define NEBULA_FILE_ID NOX("NEBU")
171 #define NEBULA_MAJOR_VERSION 1 // Can be 1-?
172 #define NEBULA_MINOR_VERSION 0 // Can be 0-99
177 void project_2d_onto_sphere( vector *pnt, float u, float v )
181 a = PI * (2.0f * u - 1.0f );
183 s = scale_factor * fl_sqrt( 1.0f - z*z );
184 x = s * (float)cos(a);
185 y = s * (float)sin(a);
191 // Version 199 mean major version=1, minor=99.
192 // Changing major means no longer compatible.
194 // 1.00 - initial version
196 // returns 0 if failed
197 int load_nebula_sub(char *filename)
201 int version, major, minor;
203 fp = cfopen(filename, "rb");
210 cfread( id, 4, 1, fp );
211 if ( strncmp( id, NEBULA_FILE_ID, 4)) {
212 mprintf(( "Not a valid nebula file.\n" ));
215 cfread( &version, sizeof(int), 1, fp );
216 major = version / 100;
217 minor = version % 100;
219 if ( major != NEBULA_MAJOR_VERSION ) {
220 mprintf(( "An out of date nebula file.\n" ));
224 cfread( &num_pts, sizeof(int), 1, fp );
225 Assert( num_pts < MAX_POINTS );
226 cfread( &num_tris, sizeof(int), 1, fp );
227 Assert( num_tris < MAX_TRIS );
229 for (int i=0; i<num_pts; i++ ) {
233 cfread( &xf, sizeof(float), 1, fp );
234 cfread( &yf, sizeof(float), 1, fp );
235 cfread( &l, sizeof(int), 1, fp );
236 project_2d_onto_sphere( &nebula_vecs[i], 1.0f - xf, yf );
237 vm_vec_scale( &nebula_vecs[i], 10.0f );
238 nebula_verts[i].b = ubyte((l*255)/31);
240 // throw in some randomness to the nebula vertices depth
243 for (int i=0; i<num_tris; i++ ) {
244 cfread( &tri[i][0], sizeof(int), 1, fp );
245 cfread( &tri[i][1], sizeof(int), 1, fp );
246 cfread( &tri[i][2], sizeof(int), 1, fp );
254 void nebula_init( char *filename, int pitch, int bank, int heading )
258 a.p = ANG_TO_RAD((float) pitch);
259 a.b = ANG_TO_RAD((float) bank);
260 a.h = ANG_TO_RAD((float) heading);
261 nebula_init(filename, &a);
264 void nebula_init( char *filename, angles * pbh )
266 if ( Nebula_loaded ) {
270 if ( load_nebula_sub( cf_add_ext(filename, NOX(".neb")) ) ) {
276 vm_angles_2_matrix(&Nebula_orient, &Nebula_pbh );
282 Nebula_orient = vmd_identity_matrix;
291 // no nebula for you!
294 if ( !Nebula_loaded ) {
298 if ( !Detail.planets_suns ) {
302 // Rotate the nebula.
303 g3_start_instance_matrix( NULL, &Nebula_orient );
305 for (i=0; i<num_pts; i++ ) {
306 g3_rotate_faraway_vertex( &nebula_verts[i], &nebula_vecs[i] );
307 g3_project_vertex( &nebula_verts[i] );
310 int saved_gr_zbuffering = gr_zbuffer_get();
312 gr_zbuffer_set(GR_ZBUFF_NONE);
314 for (i=0; i<num_tris; i++ ) {
318 verts[0] = &nebula_verts[tri[i][0]];
319 verts[1] = &nebula_verts[tri[i][1]];
320 verts[2] = &nebula_verts[tri[i][2]];
322 g3_draw_poly(3, verts, TMAP_FLAG_RAMP | TMAP_FLAG_GOURAUD | TMAP_FLAG_NEBULA );
327 gr_zbuffer_set(saved_gr_zbuffering);
329 // always switch off fogging for good measure
330 if((The_mission.flags & MISSION_FLAG_FULLNEB) && (Neb2_render_mode == NEB2_RENDER_NONE)){
331 gr_fog_set(GR_FOGMODE_NONE, 0, 0, 0);
335 DCF(nebula,"Loads a different nebula")
338 dc_get_arg(ARG_STRING|ARG_NONE);
339 if ( Dc_arg_type == ARG_NONE ) {
342 nebula_init( Dc_arg );
346 dc_printf( "Usage: nebula filename\nLoads the nebula file. No filename takes away nebula\n" );