void trail_render( trail * trailp )
{
int sections[NUM_TRAIL_SECTIONS];
int num_sections = 0;
int i;
vec3d topv, botv, *fvec, last_pos, tmp_fvec;
vertex top, bot;
int nv = 0;
float w;
ubyte l;
vec3d centerv;
if (trailp->tail == trailp->head)
return;
// if this trail is on the player ship, and he's in any padlock view except rear view, don't draw
if ( (Player_ship != NULL) && trail_is_on_ship(trailp, Player_ship) &&
(Viewer_mode & (VM_PADLOCK_UP | VM_PADLOCK_LEFT | VM_PADLOCK_RIGHT)) )
{
return;
}
trail_info *ti = &trailp->info;
int n = trailp->tail;
do {
n--;
if (n < 0)
n = NUM_TRAIL_SECTIONS-1;
if (trailp->val[n] > 1.0f)
break;
sections[num_sections++] = n;
} while ( n != trailp->head );
if (num_sections <= 0)
return;
Assertion(ti->texture.bitmap_id != -1, "Weapon trail %s could not be loaded", ti->texture.filename); // We can leave this as an assert, but tell them how to fix it. --Chief
memset( &top, 0, sizeof(vertex) );
memset( &bot, 0, sizeof(vertex) );
// it's a tristrip, so allocate for 2+1
allocate_trail_verts((num_sections * 2) + 1);
float w_size = (ti->w_end - ti->w_start);
float a_size = (ti->a_end - ti->a_start);
int num_faded_sections = ti->n_fade_out_sections;
for (i = 0; i < num_sections; i++) {
n = sections[i];
float init_fade_out = 1.0f;
if ((num_faded_sections > 0) && (i < num_faded_sections)) {
init_fade_out = ((float) i) / (float) num_faded_sections;
}
w = trailp->val[n] * w_size + ti->w_start;
if (init_fade_out != 1.0f) {
l = (ubyte)fl2i((trailp->val[n] * a_size + ti->a_start) * 255.0f * init_fade_out * init_fade_out);
} else {
l = (ubyte)fl2i((trailp->val[n] * a_size + ti->a_start) * 255.0f);
}
if ( i == 0 ) {
if ( num_sections > 1 ) {
vm_vec_sub(&tmp_fvec, &trailp->pos[n], &trailp->pos[sections[i+1]] );
vm_vec_normalize_safe(&tmp_fvec);
fvec = &tmp_fvec;
} else {
fvec = &tmp_fvec;
fvec->xyz.x = 0.0f;
fvec->xyz.y = 0.0f;
fvec->xyz.z = 1.0f;
}
} else {
vm_vec_sub(&tmp_fvec, &last_pos, &trailp->pos[n] );
vm_vec_normalize_safe(&tmp_fvec);
fvec = &tmp_fvec;
}
trail_calc_facing_pts( &topv, &botv, fvec, &trailp->pos[n], w );
if ( !Cmdline_nohtl ) {
g3_transfer_vertex( &top, &topv );
g3_transfer_vertex( &bot, &botv );
} else {
g3_rotate_vertex( &top, &topv );
g3_rotate_vertex( &bot, &botv );
}
top.a = bot.a = l;
if (i > 0) {
float U = i2fl(i);
if (i == num_sections-1) {
// Last one...
vm_vec_avg( ¢erv, &topv, &botv );
if ( !Cmdline_nohtl )
g3_transfer_vertex( &Trail_v_list[nv+2], ¢erv );
else
g3_rotate_vertex( &Trail_v_list[nv+2], ¢erv );
Trail_v_list[nv].a = l;
Trail_v_list[nv].texture_position.u = U;
Trail_v_list[nv].texture_position.v = 1.0f;
Trail_v_list[nv].r = Trail_v_list[nv].g = Trail_v_list[nv].b = l;
nv++;
Trail_v_list[nv].texture_position.u = U;
Trail_v_list[nv].texture_position.v = 0.0f;
Trail_v_list[nv].r = Trail_v_list[nv].g = Trail_v_list[nv].b = l;
nv++;
Trail_v_list[nv].texture_position.u = U + 1.0f;
Trail_v_list[nv].texture_position.v = 0.5f;
Trail_v_list[nv].r = Trail_v_list[nv].g = Trail_v_list[nv].b = 0;
nv++;
} else {
Trail_v_list[nv].texture_position.u = U;
Trail_v_list[nv].texture_position.v = 1.0f;
Trail_v_list[nv].r = Trail_v_list[nv].g = Trail_v_list[nv].b = l;
nv++;
Trail_v_list[nv].texture_position.u = U;
Trail_v_list[nv].texture_position.v = 0.0f;
Trail_v_list[nv].r = Trail_v_list[nv].g = Trail_v_list[nv].b = l;
nv++;
}
}
last_pos = trailp->pos[n];
Trail_v_list[nv] = top;
Trail_v_list[nv+1] = bot;
}
if ( !nv )
return;
if (nv < 3)
Error( LOCATION, "too few verts in trail render\n" );
// there should always be three verts in the last section and 2 everyware else, therefore there should always be an odd number of verts
if ( (nv % 2) != 1 )
Warning( LOCATION, "even number of verts in trail render\n" );
profile_begin("Trail Draw");
gr_set_bitmap( ti->texture.bitmap_id, GR_ALPHABLEND_FILTER, GR_BITBLT_MODE_NORMAL, 1.0f );
gr_render(nv, Trail_v_list, TMAP_FLAG_TEXTURED | TMAP_FLAG_ALPHA | TMAP_FLAG_GOURAUD | TMAP_FLAG_RGB | TMAP_HTL_3D_UNLIT | TMAP_FLAG_TRISTRIP);
profile_end("Trail Draw");
}
void particle_render_all()
{
ubyte flags;
float pct_complete;
float alpha;
vertex pos;
vec3d ts, te, temp;
int rotate = 1;
int framenum, cur_frame;
bool render_batch = false;
int tmap_flags = TMAP_FLAG_TEXTURED | TMAP_HTL_3D_UNLIT | TMAP_FLAG_SOFT_QUAD;
if ( !Particles_enabled )
return;
MONITOR_INC( NumParticlesRend, Num_particles );
if ( Particles.empty() )
return;
for (SCP_vector<particle*>::iterator p = Particles.begin(); p != Particles.end(); ++p) {
particle* part = *p;
// skip back-facing particles (ripped from fullneb code)
// Wanderer - add support for attached particles
vec3d p_pos;
if (part->attached_objnum >= 0) {
vm_vec_unrotate(&p_pos, &part->pos, &Objects[part->attached_objnum].orient);
vm_vec_add2(&p_pos, &Objects[part->attached_objnum].pos);
} else {
p_pos = part->pos;
}
if ( vm_vec_dot_to_point(&Eye_matrix.vec.fvec, &Eye_position, &p_pos) <= 0.0f ) {
continue;
}
// calculate the alpha to draw at
alpha = get_current_alpha(&p_pos);
// if it's transparent then just skip it
if (alpha <= 0.0f) {
continue;
}
// make sure "rotate" is enabled for this particle
rotate = 1;
// if this is a tracer style particle, calculate tracer vectors
if (part->tracer_length > 0.0f) {
ts = p_pos;
temp = part->velocity;
vm_vec_normalize_quick(&temp);
vm_vec_scale_add(&te, &ts, &temp, part->tracer_length);
// don't bother rotating
rotate = 0;
}
// rotate the vertex
if (rotate) {
flags = g3_rotate_vertex( &pos, &p_pos );
if ( flags ) {
continue;
}
if (!Cmdline_nohtl)
g3_transfer_vertex(&pos, &p_pos);
}
// pct complete for the particle
pct_complete = part->age / part->max_life;
// figure out which frame we should be using
if (part->nframes > 1) {
framenum = fl2i(pct_complete * part->nframes + 0.5);
CLAMP(framenum, 0, part->nframes-1);
cur_frame = part->reverse ? (part->nframes - framenum - 1) : framenum;
} else {
cur_frame = 0;
}
if (part->type == PARTICLE_DEBUG) {
gr_set_color( 255, 0, 0 );
g3_draw_sphere_ez( &p_pos, part->radius );
} else {
framenum = part->optional_data;
Assert( cur_frame < part->nframes );
// if this is a tracer style particle
if (part->tracer_length > 0.0f) {
batch_add_laser( framenum + cur_frame, &ts, part->radius, &te, part->radius );
}
// draw as a regular bitmap
else {
batch_add_bitmap( framenum + cur_frame, tmap_flags, &pos, part->particle_index % 8, part->radius, alpha );
}
render_batch = true;
}
}
profile_begin("Batch Render");
if (render_batch) {
batch_render_all(Particle_buffer_object);
}
profile_end("Batch Render");
}
