Compile original particle code only when USE_OPENGL is defined. This means the old particle simulations are not being executed when in headless mode.

engine/Quake/r_part.c

@@ -44,6 +44,7 @@ float texturescalefactor; //johnfitz -- compensate for apparent size of differen
 cvar_t	r_particles = {"r_particles","1", CVAR_ARCHIVE}; //johnfitz
 cvar_t	r_quadparticles = {"r_quadparticles","1", CVAR_ARCHIVE}; //johnfitz
 
+#ifdef USE_OPENGL
 /*
 ===============
 R_ParticleTextureLookup -- johnfitz -- generate nice antialiased 32x32 circle for particles
@@ -140,6 +141,7 @@ static void R_SetParticleTexture_f (cvar_t *var)
 //		break;
 	}
 }
+#endif	// USE_OPENGL
 
 /*
 ===============
@@ -148,6 +150,7 @@ R_InitParticles
 */
 void R_InitParticles (void)
 {
+#ifdef USE_OPENGL
 	int		i;
 
 	i = COM_CheckParm ("-particles");
@@ -171,6 +174,7 @@ void R_InitParticles (void)
 	Cvar_RegisterVariable (&r_quadparticles); //johnfitz
 
 	R_InitParticleTextures (); //johnfitz
+#endif
 }
 
 /*
@@ -188,6 +192,7 @@ float	timescale = 0.01;
 
 void R_EntityParticles (entity_t *ent)
 {
+#ifdef USE_OPENGL
 	int		i;
 	particle_t	*p;
 	float		angle;
@@ -241,6 +246,7 @@ void R_EntityParticles (entity_t *ent)
 		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;
 	}
+#endif
 }
 
 /*
@@ -250,6 +256,7 @@ R_ClearParticles
 */
 void R_ClearParticles (void)
 {
+#ifdef USE_OPENGL
 	int		i;
 
 	free_particles = &particles[0];
@@ -258,6 +265,7 @@ void R_ClearParticles (void)
 	for (i=0 ;i<r_numparticles ; i++)
 		particles[i].next = &particles[i+1];
 	particles[r_numparticles-1].next = NULL;
+#endif
 }
 
 /*
@@ -267,6 +275,7 @@ R_ReadPointFile_f
 */
 void R_ReadPointFile_f (void)
 {
+#ifdef USE_OPENGL
 	FILE	*f;
 	vec3_t	org;
 	int		r;
@@ -315,6 +324,7 @@ void R_ReadPointFile_f (void)
 
 	fclose (f);
 	Con_Printf ("%i points read\n", c);
+#endif
 }
 
 /*
@@ -351,6 +361,7 @@ R_ParticleExplosion
 */
 void R_ParticleExplosion (vec3_t org)
 {
+#ifdef USE_OPENGL
 	int			i, j;
 	particle_t	*p;
 
@@ -385,6 +396,7 @@ void R_ParticleExplosion (vec3_t org)
 			}
 		}
 	}
+#endif
 
 	UQ_Game_ParticleExplosion(org);
 }
@@ -396,6 +408,7 @@ R_ParticleExplosion2
 */
 void R_ParticleExplosion2 (vec3_t org, int colorStart, int colorLength)
 {
+#ifdef USE_OPENGL
 	int			i, j;
 	particle_t	*p;
 	int			colorMod = 0;
@@ -420,6 +433,7 @@ void R_ParticleExplosion2 (vec3_t org, int colorStart, int colorLength)
 			p->vel[j] = (rand()%512)-256;
 		}
 	}
+#endif
 }
 
 /*
@@ -429,6 +443,7 @@ R_BlobExplosion
 */
 void R_BlobExplosion (vec3_t org)
 {
+#ifdef USE_OPENGL
 	int			i, j;
 	particle_t	*p;
 
@@ -464,6 +479,7 @@ void R_BlobExplosion (vec3_t org)
 			}
 		}
 	}
+#endif
 }
 
 /*
@@ -473,6 +489,7 @@ R_RunParticleEffect
 */
 void R_RunParticleEffect (vec3_t org, vec3_t dir, int color, int count)
 {
+#ifdef USE_OPENGL
 	int			i, j;
 	particle_t	*p;
 
@@ -521,6 +538,7 @@ void R_RunParticleEffect (vec3_t org, vec3_t dir, int color, int count)
 			}
 		}
 	}
+#endif
 
 	if (count == 1024)
 		UQ_Game_ParticleExplosion(org);
@@ -535,6 +553,7 @@ R_LavaSplash
 */
 void R_LavaSplash (vec3_t org)
 {
+#ifdef USE_OPENGL
 	int			i, j, k;
 	particle_t	*p;
 	float		vel;
@@ -567,6 +586,7 @@ void R_LavaSplash (vec3_t org)
 				vel = 50 + (rand()&63);
 				VectorScale (dir, vel, p->vel);
 			}
+#endif
 
 	UQ_Game_LavaSplash(org);
 }
@@ -578,6 +598,7 @@ R_TeleportSplash
 */
 void R_TeleportSplash (vec3_t org)
 {
+#ifdef USE_OPENGL
 	int			i, j, k;
 	particle_t	*p;
 	float		vel;
@@ -610,6 +631,7 @@ void R_TeleportSplash (vec3_t org)
 				vel = 50 + (rand()&63);
 				VectorScale (dir, vel, p->vel);
 			}
+#endif
 
 	UQ_Game_TeleportSplash(org);
 }
@@ -623,6 +645,7 @@ FIXME -- rename function and use #defined types instead of numbers
 */
 void R_RocketTrail (vec3_t start, vec3_t end, int type)
 {
+#ifdef USE_OPENGL
 	vec3_t		vec;
 	float		len;
 	int			j;
@@ -722,6 +745,7 @@ void R_RocketTrail (vec3_t start, vec3_t end, int type)
 
 		VectorAdd (start, vec, start);
 	}
+#endif
 }
 
 /*
@@ -731,6 +755,7 @@ CL_RunParticles -- johnfitz -- all the particle behavior, separated from R_DrawP
 */
 void CL_RunParticles (void)
 {
+#ifdef USE_OPENGL
 	particle_t		*p, *kill;
 	int				i;
 	float			time1, time2, time3, dvel, frametime, grav;
@@ -828,6 +853,7 @@ void CL_RunParticles (void)
 			break;
 		}
 	}
+#endif
 }
 
 /*
@@ -837,6 +863,7 @@ R_DrawParticles -- johnfitz -- moved all non-drawing code to CL_RunParticles
 */
 void R_DrawParticles (void)
 {
+#ifdef USE_OPENGL
 	particle_t		*p;
 	float			scale;
 	vec3_t			up, right, p_up, p_right, p_upright; //johnfitz -- p_ vectors
@@ -952,6 +979,7 @@ void R_DrawParticles (void)
 	glDisable (GL_BLEND);
 	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 	glColor3f(1,1,1);
+#endif
 }
 
 
@@ -962,6 +990,7 @@ R_DrawParticles_ShowTris -- johnfitz
 */
 void R_DrawParticles_ShowTris (void)
 {
+#ifdef USE_OPENGL
 	particle_t		*p;
 	float			scale;
 	vec3_t			up, right, p_up, p_right, p_upright;
@@ -1032,5 +1061,6 @@ void R_DrawParticles_ShowTris (void)
 		}
 		glEnd ();
 	}
+#endif
 }