Fix particles not properly updated by their lifetime

[Chaosus]

Fixed several properties which gather from the texture in default Particles material that is not properly handled by lifetime_randomness. Also fixed in CPUParticles/CPUParticles2D.

Before:

After:

Fix #43485

Test Project:
Particles_3.2_CurveTest.zip

[lawnjelly]

Should p.custom[1] be set as the same as tv too? Or is there something that assumes p.custom[1] is in relation to the unadjusted lifetime?

[Chaosus]

Its used in this code:

float base_angle = (parameters[PARAM_ANGLE] + tex_angle) * Math::lerp(1.0f, p.angle_rand, randomness[PARAM_ANGLE]);
			base_angle += p.custom[1] * lifetime * (parameters[PARAM_ANGULAR_VELOCITY] + tex_angular_velocity) * Math::lerp(1.0f, rand_from_seed(alt_seed) * 2.0f - 1.0f, randomness[PARAM_ANGULAR_VELOCITY]);
			p.rotation = Math::deg2rad(base_angle); //angle
			float animation_phase = (parameters[PARAM_ANIM_OFFSET] + tex_anim_offset) * Math::lerp(1.0f, p.anim_offset_rand, randomness[PARAM_ANIM_OFFSET]) + p.custom[1] * (parameters[PARAM_ANIM_SPEED] + tex_anim_speed) * Math::lerp(1.0f, rand_from_seed(alt_seed), randomness[PARAM_ANIM_SPEED]);
			p.custom[2] = animation_phase;

I'm not sure whether it's can be changed here so I used a temporary variable to avoid this.

[lawnjelly]

I've no idea either not that familiar with the particles, we'll see if anyone else chimes in.. Worst case though it wouldn't be bad to merge as is and this could be fixed in a separate PR if necessary.

[akien-mga]

Thanks!