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Fix random particle origin/velocity z component.

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This is a quick fix until I get a random number generator into QF.

Mingw's RAND_MAX is only 0x7fff and so the (((rnd >> 10) & 63) - 31.5) / 63.0
used for the z component of origin and velocity would never go positive.
For now, change the 10 to 9 (reusing another bit from Y). I plan on
implementing a full 32-bit PRNG in QF so we always have a reliable
generator.
This commit is contained in:
Bill Currie 2013-01-21 14:53:13 +09:00
parent e8721122b1
commit 3de67589a3
4 changed files with 8 additions and 8 deletions
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4
libs/video/renderer/gl/gl_dyn_part.c
View file

@ -113,11 +113,11 @@ particle_new_random (ptype_t type, int texnum, const vec3_t org, int org_fuzz,
rnd = rand ();
porg[0] = o_fuzz * ((rnd & 63) - 31.5) / 63.0 + org[0];
porg[1] = o_fuzz * (((rnd >> 5) & 63) - 31.5) / 63.0 + org[1];
porg[2] = o_fuzz * (((rnd >> 10) & 63) - 31.5) / 63.0 + org[2];
porg[2] = o_fuzz * (((rnd >> 9) & 63) - 31.5) / 63.0 + org[2];
rnd = rand ();
pvel[0] = v_fuzz * ((rnd & 63) - 31.5) / 63.0;
pvel[1] = v_fuzz * (((rnd >> 5) & 63) - 31.5) / 63.0;
pvel[2] = v_fuzz * (((rnd >> 10) & 63) - 31.5) / 63.0;
pvel[2] = v_fuzz * (((rnd >> 9) & 63) - 31.5) / 63.0;
particle_new (type, texnum, porg, scale, pvel, die, color, alpha, ramp);
}

4
libs/video/renderer/glsl/glsl_particles.c
View file

@ -171,11 +171,11 @@ particle_new_random (ptype_t type, int texnum, const vec3_t org, int org_fuzz,
rnd = rand ();
porg[0] = o_fuzz * ((rnd & 63) - 31.5) / 63.0 + org[0];
porg[1] = o_fuzz * (((rnd >> 5) & 63) - 31.5) / 63.0 + org[1];
porg[2] = o_fuzz * (((rnd >> 10) & 63) - 31.5) / 63.0 + org[2];
porg[2] = o_fuzz * (((rnd >> 9) & 63) - 31.5) / 63.0 + org[2];
rnd = rand ();
pvel[0] = v_fuzz * ((rnd & 63) - 31.5) / 63.0;
pvel[1] = v_fuzz * (((rnd >> 5) & 63) - 31.5) / 63.0;
pvel[2] = v_fuzz * (((rnd >> 10) & 63) - 31.5) / 63.0;
pvel[2] = v_fuzz * (((rnd >> 9) & 63) - 31.5) / 63.0;
particle_new (type, texnum, porg, scale, pvel, die, color, alpha, ramp);
}

4
libs/video/renderer/sw/sw_rpart.c
View file

@ -908,11 +908,11 @@ R_Particle_NewRandom (ptype_t type, int texnum, const vec3_t org, int org_fuzz,
rnd = rand ();
porg[0] = o_fuzz * ((rnd & 63) - 31.5) / 63.0 + org[0];
porg[1] = o_fuzz * (((rnd >> 5) & 63) - 31.5) / 63.0 + org[1];
porg[2] = o_fuzz * (((rnd >> 10) & 63) - 31.5) / 63.0 + org[2];
porg[2] = o_fuzz * (((rnd >> 9) & 63) - 31.5) / 63.0 + org[2];
rnd = rand ();
pvel[0] = v_fuzz * ((rnd & 63) - 31.5) / 63.0;
pvel[1] = v_fuzz * (((rnd >> 5) & 63) - 31.5) / 63.0;
pvel[2] = v_fuzz * (((rnd >> 10) & 63) - 31.5) / 63.0;
pvel[2] = v_fuzz * (((rnd >> 9) & 63) - 31.5) / 63.0;
R_Particle_New (type, texnum, porg, scale, pvel, die, color, alpha, ramp);
}

4
libs/video/renderer/sw32/sw32_rpart.c
View file

@ -921,11 +921,11 @@ sw32_R_Particle_NewRandom (ptype_t type, int texnum, const vec3_t org,
rnd = rand ();
porg[0] = o_fuzz * ((rnd & 63) - 31.5) / 63.0 + org[0];
porg[1] = o_fuzz * (((rnd >> 5) & 63) - 31.5) / 63.0 + org[1];
porg[2] = o_fuzz * (((rnd >> 10) & 63) - 31.5) / 63.0 + org[2];
porg[2] = o_fuzz * (((rnd >> 9) & 63) - 31.5) / 63.0 + org[2];
rnd = rand ();
pvel[0] = v_fuzz * ((rnd & 63) - 31.5) / 63.0;
pvel[1] = v_fuzz * (((rnd >> 5) & 63) - 31.5) / 63.0;
pvel[2] = v_fuzz * (((rnd >> 10) & 63) - 31.5) / 63.0;
pvel[2] = v_fuzz * (((rnd >> 9) & 63) - 31.5) / 63.0;
sw32_R_Particle_New (type, texnum, porg, scale, pvel, die, color, alpha, ramp);
}