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quakespasm/Quake/r_part.cpp
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/*
Copyright (C) 1996-2001 Id Software, Inc.
Copyright (C) 2002-2009 John Fitzgibbons and others
Copyright (C) 2007-2008 Kristian Duske
Copyright (C) 2010-2014 QuakeSpasm developers
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "quakedef.hpp"
#define ABSOLUTE_MAX_PARTICLES 32768 // default max # of particles at one time
#define ABSOLUTE_MIN_PARTICLES 512 // no fewer than this no matter what's
// on the command line
#define DEFAULT_NUM_PARTICLES 16384
static int ramp1[8] = {0x6f, 0x6d, 0x6b, 0x69, 0x67, 0x65, 0x63, 0x61};
static int ramp2[8] = {0x6f, 0x6e, 0x6d, 0x6c, 0x6b, 0x6a, 0x68, 0x66};
static int ramp3[8] = {0x6d, 0x6b, 6, 5, 4, 3};
static particle_t *active_particles, *free_particles, *particles;
static int r_numparticles;
static gltexture_t *particletexture, *particletexture1, *particletexture2, *particletexture3; //johnfitz
static float texturescalefactor; //johnfitz -- compensate for apparent size of different particle textures
convar r_particles{"r_particles", "1", {.archive = true}}; //johnfitz
convar r_quadparticles{"r_quadparticles", "1", {.archive = true}}; //johnfitz
/*
===============
R_ParticleTextureLookup -- johnfitz -- generate nice antialiased 32x32 circle for particles
===============
*/
int R_ParticleTextureLookup(int x, int y, int sharpness) {
int r; //distance from point x,y to circle origin, squared
int a; //alpha value to return
x -= 16;
y -= 16;
r = x * x + y * y;
r = r > 255 ? 255 : r;
a = sharpness * (255 - r);
a = std::min(a, 255);
return a;
}
/*
===============
R_InitParticleTextures -- johnfitz -- rewritten
===============
*/
void R_InitParticleTextures(void) {
int x, y;
static byte particle1_data[64 * 64 * 4];
static byte particle2_data[2 * 2 * 4];
static byte particle3_data[64 * 64 * 4];
byte *dst;
// particle texture 1 -- circle
dst = particle1_data;
for (x = 0; x < 64; x++)
for (y = 0; y < 64; y++) {
*dst++ = 255;
*dst++ = 255;
*dst++ = 255;
*dst++ = R_ParticleTextureLookup(x, y, 8);
}
particletexture1 = TexMgr_LoadImage(NULL, "particle1", 64, 64, SRC_RGBA, particle1_data, "",
(src_offset_t) particle1_data,
TEXPREF_PERSIST | TEXPREF_ALPHA | TEXPREF_LINEAR);
// particle texture 2 -- square
dst = particle2_data;
for (x = 0; x < 2; x++)
for (y = 0; y < 2; y++) {
*dst++ = 255;
*dst++ = 255;
*dst++ = 255;
*dst++ = x || y ? 0 : 255;
}
particletexture2 = TexMgr_LoadImage(NULL, "particle2", 2, 2, SRC_RGBA, particle2_data, "",
(src_offset_t) particle2_data,
TEXPREF_PERSIST | TEXPREF_ALPHA | TEXPREF_NEAREST);
// particle texture 3 -- blob
dst = particle3_data;
for (x = 0; x < 64; x++)
for (y = 0; y < 64; y++) {
*dst++ = 255;
*dst++ = 255;
*dst++ = 255;
*dst++ = R_ParticleTextureLookup(x, y, 2);
}
particletexture3 = TexMgr_LoadImage(NULL, "particle3", 64, 64, SRC_RGBA, particle3_data, "",
(src_offset_t) particle3_data,
TEXPREF_PERSIST | TEXPREF_ALPHA | TEXPREF_LINEAR);
//set default
particletexture = particletexture1;
texturescalefactor = 1.27;
}
/*
===============
R_SetParticleTexture_f -- johnfitz
===============
*/
static void R_SetParticleTexture_f(convar *var) {
switch ((int) (r_particles.value)) {
case 1:
particletexture = particletexture1;
texturescalefactor = 1.27;
break;
case 2:
particletexture = particletexture2;
texturescalefactor = 1.0;
break;
// case 3:
// particletexture = particletexture3;
// texturescalefactor = 1.5;
// break;
}
}
/*
===============
R_InitParticles
===============
*/
void R_InitParticles(void) {
auto i = common::check_param("-particles");
if (i.has_value() && i.value() < common::_argv.size() - 1) {
r_numparticles = atoi(common::_argv[i.value() + 1].c_str());
if (r_numparticles < ABSOLUTE_MIN_PARTICLES)
r_numparticles = ABSOLUTE_MIN_PARTICLES;
else if (r_numparticles > ABSOLUTE_MAX_PARTICLES)
r_numparticles = ABSOLUTE_MAX_PARTICLES;
} else {
r_numparticles = DEFAULT_NUM_PARTICLES;
}
particles = (particle_t *)
Hunk_AllocName(r_numparticles * sizeof(particle_t), "particles");
r_particles.inscribe(); //johnfitz
r_particles.set_callback(R_SetParticleTexture_f);
r_quadparticles.inscribe(); //johnfitz
R_InitParticleTextures(); //johnfitz
}
/*
===============
R_EntityParticles
===============
*/
static vec3_t avelocities[NUMVERTEXNORMALS];
static float beamlength = 16;
void R_EntityParticles(entity_t *ent) {
int i;
particle_t *p;
float angle;
float sp, sy, cp, cy;
// float sr, cr;
// int count;
vec3_t forward;
float dist;
dist = 64;
// count = 50;
if (!avelocities[0][0]) {
for (i = 0; i < NUMVERTEXNORMALS; i++) {
avelocities[i][0] = (rand() & 255) * 0.01;
avelocities[i][1] = (rand() & 255) * 0.01;
avelocities[i][2] = (rand() & 255) * 0.01;
}
}
for (i = 0; i < NUMVERTEXNORMALS; i++) {
angle = cl.time * avelocities[i][0];
sy = sin(angle);
cy = cos(angle);
angle = cl.time * avelocities[i][1];
sp = sin(angle);
cp = cos(angle);
angle = cl.time * avelocities[i][2];
// sr = sin(angle);
// cr = cos(angle);
forward[0] = cp * cy;
forward[1] = cp * sy;
forward[2] = -sp;
if (!free_particles)
return;
p = free_particles;
free_particles = p->next;
p->next = active_particles;
active_particles = p;
p->die = cl.time + 0.01;
p->color = 0x6f;
p->type = pt_explode;
p->org[0] = ent->origin[0] + r_avertexnormals[i][0] * dist + forward[0] * beamlength;
p->org[1] = ent->origin[1] + r_avertexnormals[i][1] * dist + forward[1] * beamlength;
p->org[2] = ent->origin[2] + r_avertexnormals[i][2] * dist + forward[2] * beamlength;
}
}
/*
===============
R_ClearParticles
===============
*/
void R_ClearParticles(void) {
int i;
free_particles = &particles[0];
active_particles = NULL;
for (i = 0; i < r_numparticles; i++)
particles[i].next = &particles[i + 1];
particles[r_numparticles - 1].next = NULL;
}
/*
===============
R_ReadPointFile_f
===============
*/
void R_ReadPointFile_f(void) {
FILE *f;
vec3_t org;
int r;
int c;
particle_t *p;
char name[MAX_QPATH];
if (cls.state != ca_connected)
return; // need an active map.
q_snprintf(name, sizeof(name), "maps/%s.pts", cl.mapname);
COM_FOpenFile(name, &f, NULL);
if (!f) {
console::info("couldn't open %s\n", name);
return;
}
console::info("Reading %s...\n", name);
c = 0;
org[0] = org[1] = org[2] = 0; // silence pesky compiler warnings
for (;;) {
r = fscanf(f, "%f %f %f\n", &org[0], &org[1], &org[2]);
if (r != 3)
break;
c++;
if (!free_particles) {
console::info("Not enough free particles\n");
break;
}
p = free_particles;
free_particles = p->next;
p->next = active_particles;
active_particles = p;
p->die = 99999;
p->color = (-c) & 15;
p->type = pt_static;
VectorCopy(vec3_origin, p->vel);
VectorCopy(org, p->org);
}
fclose(f);
console::info("%i points read\n", c);
}
/*
===============
R_ParseParticleEffect
Parse an effect out of the server message
===============
*/
void R_ParseParticleEffect(void) {
vec3_t org, dir;
int i, count, msgcount, color;
for (i = 0; i < 3; i++)
org[i] = net_message.read_coord(static_cast<net::rmq_flags>(cl.protocolflags)).value();
for (i = 0; i < 3; i++)
dir[i] = net_message.read_char().value() * (1.0 / 16);
msgcount = net_message.read_byte().value();
color = net_message.read_byte().value();
if (msgcount == 255)
count = 1024;
else
count = msgcount;
R_RunParticleEffect(org, dir, color, count);
}
/*
===============
R_ParticleExplosion
===============
*/
void R_ParticleExplosion(vec3_t org) {
int i, j;
particle_t *p;
for (i = 0; i < 1024; i++) {
if (!free_particles)
return;
p = free_particles;
free_particles = p->next;
p->next = active_particles;
active_particles = p;
p->die = cl.time + 5;
p->color = ramp1[0];
p->ramp = rand() & 3;
if (i & 1) {
p->type = pt_explode;
for (j = 0; j < 3; j++) {
p->org[j] = org[j] + ((rand() % 32) - 16);
p->vel[j] = (rand() % 512) - 256;
}
} else {
p->type = pt_explode2;
for (j = 0; j < 3; j++) {
p->org[j] = org[j] + ((rand() % 32) - 16);
p->vel[j] = (rand() % 512) - 256;
}
}
}
}
/*
===============
R_ParticleExplosion2
===============
*/
void R_ParticleExplosion2(vec3_t org, int colorStart, int colorLength) {
int i, j;
particle_t *p;
int colorMod = 0;
for (i = 0; i < 512; i++) {
if (!free_particles)
return;
p = free_particles;
free_particles = p->next;
p->next = active_particles;
active_particles = p;
p->die = cl.time + 0.3;
p->color = colorStart + (colorMod % colorLength);
colorMod++;
p->type = pt_blob;
for (j = 0; j < 3; j++) {
p->org[j] = org[j] + ((rand() % 32) - 16);
p->vel[j] = (rand() % 512) - 256;
}
}
}
/*
===============
R_BlobExplosion
===============
*/
void R_BlobExplosion(vec3_t org) {
int i, j;
particle_t *p;
for (i = 0; i < 1024; i++) {
if (!free_particles)
return;
p = free_particles;
free_particles = p->next;
p->next = active_particles;
active_particles = p;
p->die = cl.time + 1 + (rand() & 8) * 0.05;
if (i & 1) {
p->type = pt_blob;
p->color = 66 + rand() % 6;
for (j = 0; j < 3; j++) {
p->org[j] = org[j] + ((rand() % 32) - 16);
p->vel[j] = (rand() % 512) - 256;
}
} else {
p->type = pt_blob2;
p->color = 150 + rand() % 6;
for (j = 0; j < 3; j++) {
p->org[j] = org[j] + ((rand() % 32) - 16);
p->vel[j] = (rand() % 512) - 256;
}
}
}
}
/*
===============
R_RunParticleEffect
===============
*/
void R_RunParticleEffect(vec3_t org, vec3_t dir, int color, int count) {
int i, j;
particle_t *p;
for (i = 0; i < count; i++) {
if (!free_particles)
return;
p = free_particles;
free_particles = p->next;
p->next = active_particles;
active_particles = p;
if (count == 1024) {
// rocket explosion
p->die = cl.time + 5;
p->color = ramp1[0];
p->ramp = rand() & 3;
if (i & 1) {
p->type = pt_explode;
for (j = 0; j < 3; j++) {
p->org[j] = org[j] + ((rand() % 32) - 16);
p->vel[j] = (rand() % 512) - 256;
}
} else {
p->type = pt_explode2;
for (j = 0; j < 3; j++) {
p->org[j] = org[j] + ((rand() % 32) - 16);
p->vel[j] = (rand() % 512) - 256;
}
}
} else {
p->die = cl.time + 0.1 * (rand() % 5);
p->color = (color & ~7) + (rand() & 7);
p->type = pt_slowgrav;
for (j = 0; j < 3; j++) {
p->org[j] = org[j] + ((rand() & 15) - 8);
p->vel[j] = dir[j] * 15; // + (rand()%300)-150;
}
}
}
}
/*
===============
R_LavaSplash
===============
*/
void R_LavaSplash(vec3_t org) {
int i, j, k;
particle_t *p;
float vel;
vec3_t dir;
for (i = -16; i < 16; i++)
for (j = -16; j < 16; j++)
for (k = 0; k < 1; k++) {
if (!free_particles)
return;
p = free_particles;
free_particles = p->next;
p->next = active_particles;
active_particles = p;
p->die = cl.time + 2 + (rand() & 31) * 0.02;
p->color = 224 + (rand() & 7);
p->type = pt_slowgrav;
dir[0] = j * 8 + (rand() & 7);
dir[1] = i * 8 + (rand() & 7);
dir[2] = 256;
p->org[0] = org[0] + dir[0];
p->org[1] = org[1] + dir[1];
p->org[2] = org[2] + (rand() & 63);
VectorNormalize(dir);
vel = 50 + (rand() & 63);
VectorScale(dir, vel, p->vel);
}
}
/*
===============
R_TeleportSplash
===============
*/
void R_TeleportSplash(vec3_t org) {
int i, j, k;
particle_t *p;
float vel;
vec3_t dir;
for (i = -16; i < 16; i += 4) {
for (j = -16; j < 16; j += 4) {
for (k = -24; k < 32; k += 4) {
if (!free_particles)
return;
p = free_particles;
free_particles = p->next;
p->next = active_particles;
active_particles = p;
p->die = cl.time + 0.2 + (rand() & 7) * 0.02;
p->color = 7 + (rand() & 7);
p->type = pt_slowgrav;
dir[0] = j * 8;
dir[1] = i * 8;
dir[2] = k * 8;
p->org[0] = org[0] + i + (rand() & 3);
p->org[1] = org[1] + j + (rand() & 3);
p->org[2] = org[2] + k + (rand() & 3);
VectorNormalize(dir);
vel = 50 + (rand() & 63);
VectorScale(dir, vel, p->vel);
}
}
}
}
/*
===============
R_RocketTrail
FIXME -- rename function and use #defined types instead of numbers
===============
*/
void R_RocketTrail(vec3_t start, vec3_t end, int type) {
vec3_t vec;
float len;
int j;
particle_t *p;
int dec;
static int tracercount;
VectorSubtract(end, start, vec);
len = VectorNormalize(vec);
if (type < 128)
dec = 3;
else {
dec = 1;
type -= 128;
}
while (len > 0) {
len -= dec;
if (!free_particles)
return;
p = free_particles;
free_particles = p->next;
p->next = active_particles;
active_particles = p;
VectorCopy(vec3_origin, p->vel);
p->die = cl.time + 2;
switch (type) {
case 0: // rocket trail
p->ramp = (rand() & 3);
p->color = ramp3[(int) p->ramp];
p->type = pt_fire;
for (j = 0; j < 3; j++)
p->org[j] = start[j] + ((rand() % 6) - 3);
break;
case 1: // smoke smoke
p->ramp = (rand() & 3) + 2;
p->color = ramp3[(int) p->ramp];
p->type = pt_fire;
for (j = 0; j < 3; j++)
p->org[j] = start[j] + ((rand() % 6) - 3);
break;
case 2: // blood
p->type = pt_grav;
p->color = 67 + (rand() & 3);
for (j = 0; j < 3; j++)
p->org[j] = start[j] + ((rand() % 6) - 3);
break;
case 3:
case 5: // tracer
p->die = cl.time + 0.5;
p->type = pt_static;
if (type == 3)
p->color = 52 + ((tracercount & 4) << 1);
else
p->color = 230 + ((tracercount & 4) << 1);
tracercount++;
VectorCopy(start, p->org);
if (tracercount & 1) {
p->vel[0] = 30 * vec[1];
p->vel[1] = 30 * -vec[0];
} else {
p->vel[0] = 30 * -vec[1];
p->vel[1] = 30 * vec[0];
}
break;
case 4: // slight blood
p->type = pt_grav;
p->color = 67 + (rand() & 3);
for (j = 0; j < 3; j++)
p->org[j] = start[j] + ((rand() % 6) - 3);
len -= 3;
break;
case 6: // voor trail
p->color = 9 * 16 + 8 + (rand() & 3);
p->type = pt_static;
p->die = cl.time + 0.3;
for (j = 0; j < 3; j++)
p->org[j] = start[j] + ((rand() & 15) - 8);
break;
}
VectorAdd(start, vec, start);
}
}
/*
===============
CL_RunParticles -- johnfitz -- all the particle behavior, separated from R_DrawParticles
===============
*/
void CL_RunParticles(void) {
particle_t *p, *kill;
int i;
float time1, time2, time3, dvel, frametime, grav;
extern convar sv_gravity;
frametime = cl.time - cl.oldtime;
time3 = frametime * 15;
time2 = frametime * 10;
time1 = frametime * 5;
grav = frametime * sv_gravity.value * 0.05;
dvel = 4 * frametime;
for (;;) {
kill = active_particles;
if (kill && kill->die < cl.time) {
active_particles = kill->next;
kill->next = free_particles;
free_particles = kill;
continue;
}
break;
}
for (p = active_particles; p; p = p->next) {
for (;;) {
kill = p->next;
if (kill && kill->die < cl.time) {
p->next = kill->next;
kill->next = free_particles;
free_particles = kill;
continue;
}
break;
}
p->org[0] += p->vel[0] * frametime;
p->org[1] += p->vel[1] * frametime;
p->org[2] += p->vel[2] * frametime;
switch (p->type) {
case pt_static:
break;
case pt_fire:
p->ramp += time1;
if (p->ramp >= 6)
p->die = -1;
else
p->color = ramp3[(int) p->ramp];
p->vel[2] += grav;
break;
case pt_explode:
p->ramp += time2;
if (p->ramp >= 8)
p->die = -1;
else
p->color = ramp1[(int) p->ramp];
for (i = 0; i < 3; i++)
p->vel[i] += p->vel[i] * dvel;
p->vel[2] -= grav;
break;
case pt_explode2:
p->ramp += time3;
if (p->ramp >= 8)
p->die = -1;
else
p->color = ramp2[(int) p->ramp];
for (i = 0; i < 3; i++)
p->vel[i] -= p->vel[i] * frametime;
p->vel[2] -= grav;
break;
case pt_blob:
for (i = 0; i < 3; i++)
p->vel[i] += p->vel[i] * dvel;
p->vel[2] -= grav;
break;
case pt_blob2:
for (i = 0; i < 2; i++)
p->vel[i] -= p->vel[i] * dvel;
p->vel[2] -= grav;
break;
case pt_grav:
case pt_slowgrav:
p->vel[2] -= grav;
break;
}
}
}
/*
===============
R_DrawParticles -- johnfitz -- moved all non-drawing code to CL_RunParticles
===============
*/
void R_DrawParticles(void) {
particle_t *p;
float scale;
vec3_t up, right, p_up, p_right, p_upright; //johnfitz -- p_ vectors
GLubyte color[4], *c; //johnfitz -- particle transparency
extern convar r_particles; //johnfitz
//float alpha; //johnfitz -- particle transparency
if (!r_particles.value)
return;
//ericw -- avoid empty glBegin(),glEnd() pair below; causes issues on AMD
if (!active_particles)
return;
VectorScale(vup, 1.5, up);
VectorScale(vright, 1.5, right);
GL_Bind(particletexture);
glEnable(GL_BLEND);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glDepthMask(GL_FALSE); //johnfitz -- fix for particle z-buffer bug
if (r_quadparticles.value) //johnitz -- quads save fillrate
{
glBegin(GL_QUADS);
for (p = active_particles; p; p = p->next) {
// hack a scale up to keep particles from disapearing
scale = (p->org[0] - r_origin[0]) * vpn[0]
+ (p->org[1] - r_origin[1]) * vpn[1]
+ (p->org[2] - r_origin[2]) * vpn[2];
if (scale < 20)
scale = 1 + 0.08; //johnfitz -- added .08 to be consistent
else
scale = 1 + scale * 0.004;
scale /= 2.0; //quad is half the size of triangle
scale *= texturescalefactor; //johnfitz -- compensate for apparent size of different particle textures
//johnfitz -- particle transparency and fade out
c = (GLubyte *) &d_8to24table[(int) p->color];
color[0] = c[0];
color[1] = c[1];
color[2] = c[2];
//alpha = std::clamp(p->die + 0.5 - cl.time, 0, 1);
color[3] = 255; //(int)(alpha * 255);
glColor4ubv(color);
//johnfitz
glTexCoord2f(0, 0);
glVertex3fv(p->org);
glTexCoord2f(0.5, 0);
VectorMA(p->org, scale, up, p_up);
glVertex3fv(p_up);
glTexCoord2f(0.5, 0.5);
VectorMA(p_up, scale, right, p_upright);
glVertex3fv(p_upright);
glTexCoord2f(0, 0.5);
VectorMA(p->org, scale, right, p_right);
glVertex3fv(p_right);
}
glEnd();
} else //johnitz -- triangles save verts
{
glBegin(GL_TRIANGLES);
for (p = active_particles; p; p = p->next) {
// hack a scale up to keep particles from disapearing
scale = (p->org[0] - r_origin[0]) * vpn[0]
+ (p->org[1] - r_origin[1]) * vpn[1]
+ (p->org[2] - r_origin[2]) * vpn[2];
if (scale < 20)
scale = 1 + 0.08; //johnfitz -- added .08 to be consistent
else
scale = 1 + scale * 0.004;
scale *= texturescalefactor; //johnfitz -- compensate for apparent size of different particle textures
//johnfitz -- particle transparency and fade out
c = (GLubyte *) &d_8to24table[(int) p->color];
color[0] = c[0];
color[1] = c[1];
color[2] = c[2];
//alpha = std::clamp(p->die + 0.5 - cl.time, 0, 1);
color[3] = 255; //(int)(alpha * 255);
glColor4ubv(color);
//johnfitz
glTexCoord2f(0, 0);
glVertex3fv(p->org);
glTexCoord2f(1, 0);
VectorMA(p->org, scale, up, p_up);
glVertex3fv(p_up);
glTexCoord2f(0, 1);
VectorMA(p->org, scale, right, p_right);
glVertex3fv(p_right);
}
glEnd();
}
glDepthMask(GL_TRUE); //johnfitz -- fix for particle z-buffer bug
glDisable(GL_BLEND);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glColor3f(1, 1, 1);
}
/*
===============
R_DrawParticles_ShowTris -- johnfitz
===============
*/
void R_DrawParticles_ShowTris(void) {
particle_t *p;
float scale;
vec3_t up, right, p_up, p_right, p_upright;
extern convar r_particles;
if (!r_particles.value)
return;
VectorScale(vup, 1.5, up);
VectorScale(vright, 1.5, right);
if (r_quadparticles.value) {
for (p = active_particles; p; p = p->next) {
glBegin(GL_TRIANGLE_FAN);
// hack a scale up to keep particles from disapearing
scale = (p->org[0] - r_origin[0]) * vpn[0]
+ (p->org[1] - r_origin[1]) * vpn[1]
+ (p->org[2] - r_origin[2]) * vpn[2];
if (scale < 20)
scale = 1 + 0.08; //johnfitz -- added .08 to be consistent
else
scale = 1 + scale * 0.004;
scale /= 2.0; //quad is half the size of triangle
scale *= texturescalefactor; //compensate for apparent size of different particle textures
glVertex3fv(p->org);
VectorMA(p->org, scale, up, p_up);
glVertex3fv(p_up);
VectorMA(p_up, scale, right, p_upright);
glVertex3fv(p_upright);
VectorMA(p->org, scale, right, p_right);
glVertex3fv(p_right);
glEnd();
}
} else {
glBegin(GL_TRIANGLES);
for (p = active_particles; p; p = p->next) {
// hack a scale up to keep particles from disapearing
scale = (p->org[0] - r_origin[0]) * vpn[0]
+ (p->org[1] - r_origin[1]) * vpn[1]
+ (p->org[2] - r_origin[2]) * vpn[2];
if (scale < 20)
scale = 1 + 0.08; //johnfitz -- added .08 to be consistent
else
scale = 1 + scale * 0.004;
scale *= texturescalefactor; //compensate for apparent size of different particle textures
glVertex3fv(p->org);
VectorMA(p->org, scale, up, p_up);
glVertex3fv(p_up);
VectorMA(p->org, scale, right, p_right);
glVertex3fv(p_right);
}
glEnd();
}
}
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