"fancy" particles

[MeTcHsteekle]

how do u make the original particles and somewhat enhance them like this : http://qer.planetquake.gamespy.com/scre ... icles4.jpg

just not as wacked out |:/

[revelator]

if i remember correctly it could be done by modifying the hardcoded dot sizes

Code: Select all

//this part ->
byte   dottexture[8][8] =
{
   {0,1,1,0,0,0,0,0},
   {1,1,1,1,0,0,0,0},
   {1,1,1,1,0,0,0,0},
   {0,1,1,0,0,0,0,0},
   {0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0},
   {0,0,0,0,0,0,0,0},
};
//end
void R_InitParticleTexture (void)
{
   int      x,y;
   byte   data[8][8][4];

   //
   // particle texture
   //
   particletexture = texture_extension_number++;
    GL_Bind(particletexture);
//and here
   for (x=0 ; x<8 ; x++)
   {
      for (y=0 ; y<8 ; y++)
      {
         data[y][x][0] = 255;
         data[y][x][1] = 255;
         data[y][x][2] = 255;
         data[y][x][3] = dottexture[x][y]*255;
      }
   }
//end
   glTexImage2D (GL_TEXTURE_2D, 0, gl_alpha_format, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);

   glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

   particletexture_blood = EasyTgaLoad("textures/particles/blood.tga");
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
   particletexture_dirblood = EasyTgaLoad("textures/particles/blood2.tga");
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
}

[metlslime]

looks like the particle texture is unchanged in that screenshot -- it's just that they all have like .5 alpha or something.

so just replace the glColor3f (x, y, z) with a glColor4f (x, y, z, 0.5)

[Electro]

Those are considered fancy, really??

[MeTcHsteekle]

Those are considered fancy, really??

...eh fancy enough

anyways thanks, ill see what i can break :O

[MDave]

It would be nice to make them fade over the course of its lifetime, like in quake 2.

[mh]

That's straightforward enough, just deduct some multiple of frametime from alpha during each update (each particle should of course have it's own alpha stored in the particle_t struct to enable this).

[MeTcHsteekle]

so just replace the glColor3f (x, y, z) with a glColor4f (x, y, z, 0.5)

i cant find this part

[metlslime]

oh, i guess the line is actually:

Code: Select all

glColor3ubv ((byte *)&d_8to24table[(int)p->color]);

It takes a pointer to an array of bytes, so it might be easier to replace it with:

Code: Select all

glColor4ub((byte *)&d_8to24table[(int)p->color],
           (byte *)&d_8to24table[(int)p->color] + 1,
           (byte *)&d_8to24table[(int)p->color] + 2,
           128);


replace the 128 with whatever alpha value you want, from 0-255

[MeTcHsteekle]

oh, i guess the line is actually:

Code: Select all

glColor3ubv ((byte *)&d_8to24table[(int)p->color]);

It takes a pointer to an array of bytes, so it might be easier to replace it with:

Code: Select all

glColor4ub((byte *)&d_8to24table[(int)p->color],
           (byte *)&d_8to24table[(int)p->color] + 1,
           (byte *)&d_8to24table[(int)p->color] + 2,
           128);


replace the 128 with whatever alpha value you want, from 0-255

cool it worked

but the particles have lost their colouring, and i got 9 warnings

--------------------Configuration: winquake - Win32 GL Release--------------------
Compiling...
r_part.c
C:\Users\alex\Desktop\quake\src\proquake\r_part.c(676) : warning C4047: 'function' : 'unsigned char ' differs in levels of indirection from 'unsigned char *'
C:\Users\alex\Desktop\quake\src\proquake\r_part.c(676) : warning C4024: 'glColor4ub' : different types for formal and actual parameter 1
C:\Users\alex\Desktop\quake\src\proquake\r_part.c(677) : warning C4047: 'function' : 'unsigned char ' differs in levels of indirection from 'unsigned char *'
C:\Users\alex\Desktop\quake\src\proquake\r_part.c(677) : warning C4024: 'glColor4ub' : different types for formal and actual parameter 2
C:\Users\alex\Desktop\quake\src\proquake\r_part.c(678) : warning C4047: 'function' : 'unsigned char ' differs in levels of indirection from 'unsigned char *'
C:\Users\alex\Desktop\quake\src\proquake\r_part.c(678) : warning C4024: 'glColor4ub' : different types for formal and actual parameter 3
C:\Users\alex\Desktop\quake\src\proquake\r_part.c(679) : warning C4761: integral size mismatch in argument; conversion supplied
C:\Users\alex\Desktop\quake\src\proquake\r_part.c(679) : warning C4761: integral size mismatch in argument; conversion supplied
C:\Users\alex\Desktop\quake\src\proquake\r_part.c(679) : warning C4761: integral size mismatch in argument; conversion supplied
Linking...

glprotest.exe - 0 error(s), 9 warning(s)

im sorry if im being a bother because im still new to this, i mean, i just figured out how to make the particles square in reckless'es matrix he posted
ill still look into what i can atm

edit: ouch, i tried adding a "v" to "glColor4ub" and i crashed the engine

[mh]

Try this:

Top of R_DrawParticles, declare:

Code: Select all

byte *pcolor;

Instead of the glColor3ub, use:

Code: Select all

pcolor = (byte *) &d_8to24table[(int) p->color];
glColor4ub (pcolor[0], pcolor[1], pcolor[2], 128);

Breaks things up a little, and will be slower (but not that anyone would notice ), but it's easier to read/debug/etc for when you're starting out.

[metlslime]

oops... i didn't derefence that pointer... should be:

Code: Select all

glColor4ub(*(byte *)&d_8to24table[(int)p->color],
           *(byte *)&d_8to24table[(int)p->color] + 1,
           *(byte *)&d_8to24table[(int)p->color] + 2,
           128);

but yeah, mh's code is less messy, maybe just use that instead.

[MeTcHsteekle]

thanks, didn't realize there is so many different ways to do different tasks...now i understand why engines take so long to update :O

hmm could i make a cvar for the transparency like :

Code: Select all

pcolor = (byte *) &d_8to24table[(int) p->color];
glColor4ub (pcolor[0], pcolor[1], pcolor[2], parttrans.value);

and then :

Code: Select all

cvar_t   parttrans = {"parttrans", "150", true};  //partical transparancy value...save to conf.

does that look right, and would i put it at the top of r_part.c?
should i make it gl_parttrans or r_parttrans...hmm GL or render

eh?

EDIT:

C:\Users\alex\Desktop\quake\src\proquake\r_part.c(680) : warning C4761: integral size mismatch in argument; conversion supplied

DAMN YOU WARNING!!!!!!!!!!!!!!!!!!!![aka does not compute]

EDITEDIT: BUT IT WORKS!!!!!!! WAHAHAHAHAHAHAHAHAHAHAHAHAH ...... I DESERVE A SASH http://www.newgrounds.com/portal/viewer ... kxNg%3D%3D

[mh]

Cvar values are stored as floats, so try (int) parttrans.value as your alpha input.

[MeTcHsteekle]

well, i tried that and still got the same warning [??]
perhaps i shouldn't fix something that's not broken [yet,it might break]. my next question would be how to make them effected by the lights in the map but, it sounds like it might be a lot of work for such a little effect.
so anyways, where should i look to make the particles lives longer, so they linger for a few more seconds? im guessing its still in r_part.c

........well i figured out how to make there lives shorter, now to reverse [heh]

.................got it, in r_part.c under R_DrawParticles

Code: Select all

   frametime = cl.time - cl.oldtime;
   time3 = frametime * 10;//15
   time2 = frametime * 2.2; // 15//10;   //i think i messed up the div. equally
   time1 = frametime * 1.1;//5
   grav = frametime * sv_gravity.value * 0.005; //ligers where it lives
   dvel = 4*frametime;