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/*
* Copyright (C) Volition, Inc. 1999. All rights reserved.
*
* All source code herein is the property of Volition, Inc. You may not sell
* or otherwise commercially exploit the source or things you created based on the
* source.
*
*/
#include "cfile/cfile.h"
#include "debugconsole/console.h"
#include "math/vecmat.h"
#include "mission/missionparse.h"
#include "nebula/neb.h"
#include "graphics/material.h"
#include "render/3d.h"
#include "starfield/nebula.h"
#define MAX_TRIS 200
#define MAX_POINTS 300
static int num_pts = 0;
static vec3d nebula_vecs[MAX_POINTS];
static vertex nebula_verts[MAX_POINTS];
static float scale_factor = 1.0f;
static int num_tris = 0;
static int tri[MAX_TRIS][3];
static int Nebula_loaded = 0;
static angles Nebula_pbh;
static matrix Nebula_orient;
int Nebula_pitch;
int Nebula_bank;
int Nebula_heading;
void nebula_close()
{
if (!Nebula_loaded) return;
Nebula_loaded = 0;
}
#define NEBULA_FILE_ID NOX("NEBU")
#define NEBULA_MAJOR_VERSION 1 // Can be 1-?
#define NEBULA_MINOR_VERSION 0 // Can be 0-99
// given:
// u,v in range 0-1
void project_2d_onto_sphere( vec3d *pnt, float u, float v )
{
float a,x,y,z,s;
a = PI * (2.0f * u - 1.0f );
z = 2.0f * v - 1.0f;
s = scale_factor * fl_sqrt( 1.0f - z*z );
x = s * cosf(a);
y = s * sinf(a);
pnt->xyz.x = x;
pnt->xyz.y = y;
pnt->xyz.z = z;
}
// Version 199 mean major version=1, minor=99.
// Changing major means no longer compatible.
// Revision history:
// 1.00 - initial version
// returns 0 if failed
int load_nebula_sub(const char *filename)
{
CFILE *fp;
char id[16];
int version, major;
fp = cfopen(filename, "rb");
if ( !fp ) {
return 0;
}
// ID of NEBU
cfread( id, 4, 1, fp );
if ( strncmp( id, NEBULA_FILE_ID, 4) != 0) {
mprintf(( "Not a valid nebula file.\n" ));
return 0;
}
cfread( &version, sizeof(int), 1, fp );
major = version / 100;
if ( major != NEBULA_MAJOR_VERSION ) {
mprintf(( "An out of date nebula file.\n" ));
return 0;
}
cfread( &num_pts, sizeof(int), 1, fp );
Assert( num_pts < MAX_POINTS );
cfread( &num_tris, sizeof(int), 1, fp );
Assert( num_tris < MAX_TRIS );
// Cyborg - can't load nonsense.
if (num_pts <= 0 || num_pts >= MAX_POINTS || num_tris <= 0 || num_tris >= MAX_TRIS)
return 0;
int i;
for (i=0; i<num_pts; i++ ) {
float xf, yf;
int l;
cfread( &xf, sizeof(float), 1, fp );
cfread( &yf, sizeof(float), 1, fp );
cfread( &l, sizeof(int), 1, fp );
project_2d_onto_sphere( &nebula_vecs[i], 1.0f - xf, yf );
vm_vec_scale( &nebula_vecs[i], 10.0f );
nebula_verts[i].b = ubyte((l*255)/31);
// throw in some randomness to the nebula vertices depth
}
for (i=0; i<num_tris; i++ ) {
cfread( &tri[i][0], sizeof(int), 1, fp );
cfread( &tri[i][1], sizeof(int), 1, fp );
cfread( &tri[i][2], sizeof(int), 1, fp );
}
cfclose(fp);
return 1;
}
void nebula_init( int index, int pitch, int bank, int heading )
{
angles a;
a.p = fl_radians(pitch);
a.b = fl_radians(bank);
a.h = fl_radians(heading);
nebula_init(index < 0 ? nullptr : Nebula_filenames[index], &a);
}
void nebula_init( const char *filename, angles * pbh )
{
if ( Nebula_loaded ) {
nebula_close();
}
if ( filename && load_nebula_sub( cf_add_ext(filename, NOX(".neb")) ) ) {
Nebula_loaded = 1;
}
if ( pbh ) {
Nebula_pbh = *pbh;
vm_angles_2_matrix(&Nebula_orient, &Nebula_pbh );
} else {
Nebula_pbh.p = 0.0f;
Nebula_pbh.b = 0.0f;
Nebula_pbh.h = 0.0f;
Nebula_orient = vmd_identity_matrix;
}
}
DCF(nebula,"Loads a different nebula")
{
SCP_string filename;
if (dc_optional_string_either("help", "--help")) {
dc_printf("Usage: nebula [filename]\n");
dc_printf("Loads the nebula file (without filename extension). No filename takes away nebula\n" );
return;
}
if (dc_maybe_stuff_string_white(filename)) {
nebula_init(filename.c_str());
} else {
nebula_close();
}
}
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