2 * $Logfile: /Freespace2/code/Starfield/Nebula.cpp $
7 * Code to load & display nebulas
10 * Revision 1.1 2002/05/03 03:28:10 root
14 * 14 9/01/99 11:26p Dave
15 * Fixed release build warnings.
17 * 13 8/30/99 5:01p Dave
18 * Made d3d do less state changing in the nebula. Use new chat server for
21 * 12 7/29/99 10:47p Dave
22 * Standardized D3D fogging using vertex fog. Shook out Savage 4 bugs.
24 * 11 7/14/99 9:42a Dave
25 * Put in clear_color debug function. Put in base for 3dnow stuff / P3
28 * 10 6/22/99 7:03p Dave
29 * New detail options screen.
31 * 9 3/31/99 8:24p Dave
32 * Beefed up all kinds of stuff, incluging beam weapons, nebula effects
33 * and background nebulae. Added per-ship non-dimming pixel colors.
35 * 8 12/09/98 7:34p Dave
36 * Cleanup up nebula effect. Tweaked many values.
38 * 7 12/08/98 9:36a Dave
39 * Almost done nebula effect for D3D. Looks 85% as good as Glide.
41 * 6 12/07/98 5:51p Dave
42 * Finally got d3d fog working! Now we just need to tweak values.
44 * 5 12/06/98 2:36p Dave
45 * Drastically improved nebula fogging.
47 * 4 11/14/98 5:33p Dave
48 * Lots of nebula work. Put in ship contrails.
50 * 3 11/11/98 5:37p Dave
51 * Checkin for multiplayer testing.
53 * 2 10/07/98 10:54a Dave
56 * 1 10/07/98 10:51a Dave
58 * 15 5/13/98 2:53p John
59 * Made subspace effect work under software. Had to add new inner loop to
60 * tmapper. Added glows to end of subspace effect. Made subspace effect
61 * levels use gamepalette-subspace palette.
63 * 14 4/10/98 5:20p John
64 * Changed RGB in lighting structure to be ubytes. Removed old
65 * not-necessary 24 bpp software stuff.
67 * 13 3/22/98 11:02a John
68 * Made a bunch of the detail levels actually do something
70 * 12 2/22/98 12:19p John
71 * Externalized some strings
73 * 11 1/23/98 5:08p John
74 * Took L out of vertex structure used B (blue) instead. Took all small
75 * fireballs out of fireball types and used particles instead. Fixed some
76 * debris explosion things. Restructured fireball code. Restructured
77 * some lighting code. Made dynamic lighting on by default. Made groups
78 * of lasers only cast one light. Made fireballs not cast light.
80 * 10 1/10/98 1:14p John
81 * Added explanation to debug console commands
83 * 9 12/21/97 4:33p John
84 * Made debug console functions a class that registers itself
85 * automatically, so you don't need to add the function to
88 * 8 11/25/97 11:40a Hoffoss
89 * Added support for nebula placement editing.
91 * 7 11/24/97 12:04p John
93 * 6 11/21/97 2:55p Hoffoss
94 * Added Nebula support to Fred. Implemented loading and saving nebula
95 * info to/from mission files.
97 * 5 11/21/97 11:32a John
98 * Added nebulas. Fixed some warpout bugs.
100 * 4 11/19/97 10:47p Adam
101 * upped MAX_TRIS to 200. Whaddya think this is, I-War?
103 * 3 11/16/97 2:41p John
104 * added a debug function to load a nebula into the game.
106 * 2 11/16/97 2:29p John
107 * added versioning to nebulas; put nebula code into freespace.
109 * 1 11/16/97 1:14p John
115 #include "floating.h"
119 #include "starfield.h"
122 #include "freespace.h"
127 #include "linklist.h"
129 #include "missionparse.h"
133 #define MAX_POINTS 300
135 static int neb_w = 0, neb_h = 0;
137 static int nebula_inited = 0;
138 static int num_pts = 0;
140 static vector nebula_vecs[MAX_POINTS];
141 static vertex nebula_verts[MAX_POINTS];
143 static float scale_factor = 1.0f;
145 static int num_tris = 0;
146 static int tri[MAX_TRIS][3];
148 static int Nebula_loaded = 0;
149 static angles Nebula_pbh;
150 static matrix Nebula_orient;
158 if (!Nebula_loaded) return;
163 #define NEBULA_FILE_ID NOX("NEBU")
164 #define NEBULA_MAJOR_VERSION 1 // Can be 1-?
165 #define NEBULA_MINOR_VERSION 0 // Can be 0-99
170 void project_2d_onto_sphere( vector *pnt, float u, float v )
174 a = PI * (2.0f * u - 1.0f );
176 s = scale_factor * fl_sqrt( 1.0f - z*z );
177 x = s * (float)cos(a);
178 y = s * (float)sin(a);
184 // Version 199 mean major version=1, minor=99.
185 // Changing major means no longer compatible.
187 // 1.00 - initial version
189 // returns 0 if failed
190 int load_nebula_sub(char *filename)
194 int version, major, minor;
196 fp = cfopen(filename, "rb");
203 cfread( id, 4, 1, fp );
204 if ( strncmp( id, NEBULA_FILE_ID, 4)) {
205 mprintf(( "Not a valid nebula file.\n" ));
208 cfread( &version, sizeof(int), 1, fp );
209 major = version / 100;
210 minor = version % 100;
212 if ( major != NEBULA_MAJOR_VERSION ) {
213 mprintf(( "An out of date nebula file.\n" ));
217 cfread( &num_pts, sizeof(int), 1, fp );
218 Assert( num_pts < MAX_POINTS );
219 cfread( &num_tris, sizeof(int), 1, fp );
220 Assert( num_tris < MAX_TRIS );
222 for (int i=0; i<num_pts; i++ ) {
226 cfread( &xf, sizeof(float), 1, fp );
227 cfread( &yf, sizeof(float), 1, fp );
228 cfread( &l, sizeof(int), 1, fp );
229 project_2d_onto_sphere( &nebula_vecs[i], 1.0f - xf, yf );
230 vm_vec_scale( &nebula_vecs[i], 10.0f );
231 nebula_verts[i].b = ubyte((l*255)/31);
233 // throw in some randomness to the nebula vertices depth
236 for (i=0; i<num_tris; i++ ) {
237 cfread( &tri[i][0], sizeof(int), 1, fp );
238 cfread( &tri[i][1], sizeof(int), 1, fp );
239 cfread( &tri[i][2], sizeof(int), 1, fp );
247 void nebula_init( char *filename, int pitch, int bank, int heading )
251 a.p = ANG_TO_RAD((float) pitch);
252 a.b = ANG_TO_RAD((float) bank);
253 a.h = ANG_TO_RAD((float) heading);
254 nebula_init(filename, &a);
257 void nebula_init( char *filename, angles * pbh )
259 if ( Nebula_loaded ) {
263 if ( load_nebula_sub( cf_add_ext(filename, NOX(".neb")) ) ) {
269 vm_angles_2_matrix(&Nebula_orient, &Nebula_pbh );
275 Nebula_orient = vmd_identity_matrix;
284 // no nebula for you!
287 if ( !Nebula_loaded ) {
291 if ( !Detail.planets_suns ) {
295 // Rotate the nebula.
296 g3_start_instance_matrix( NULL, &Nebula_orient );
298 for (i=0; i<num_pts; i++ ) {
299 g3_rotate_faraway_vertex( &nebula_verts[i], &nebula_vecs[i] );
300 g3_project_vertex( &nebula_verts[i] );
303 int saved_gr_zbuffering = gr_zbuffer_get();
305 gr_zbuffer_set(GR_ZBUFF_NONE);
307 for (i=0; i<num_tris; i++ ) {
311 verts[0] = &nebula_verts[tri[i][0]];
312 verts[1] = &nebula_verts[tri[i][1]];
313 verts[2] = &nebula_verts[tri[i][2]];
315 g3_draw_poly(3, verts, TMAP_FLAG_RAMP | TMAP_FLAG_GOURAUD | TMAP_FLAG_NEBULA );
320 gr_zbuffer_set(saved_gr_zbuffering);
322 // always switch off fogging for good measure
323 if((The_mission.flags & MISSION_FLAG_FULLNEB) && (Neb2_render_mode == NEB2_RENDER_NONE)){
324 gr_fog_set(GR_FOGMODE_NONE, 0, 0, 0);
328 DCF(nebula,"Loads a different nebula")
331 dc_get_arg(ARG_STRING|ARG_NONE);
332 if ( Dc_arg_type == ARG_NONE ) {
335 nebula_init( Dc_arg );
339 dc_printf( "Usage: nebula filename\nLoads the nebula file. No filename takes away nebula\n" );