cg_particles.c

quakeIII源码这个不用我多说吧

/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.

This file is part of Quake III Arena source code.

Quake III Arena source code 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.

Quake III Arena source code 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 Foobar; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/
// Rafael particles
// cg_particles.c  

#include "cg_local.h"

#define BLOODRED	2
#define EMISIVEFADE	3
#define GREY75		4

typedef struct particle_s
{
	struct particle_s	*next;

	float		time;
	float		endtime;

	vec3_t		org;
	vec3_t		vel;
	vec3_t		accel;
	int			color;
	float		colorvel;
	float		alpha;
	float		alphavel;
	int			type;
	qhandle_t	pshader;
	
	float		height;
	float		width;
				
	float		endheight;
	float		endwidth;
	
	float		start;
	float		end;

	float		startfade;
	qboolean	rotate;
	int			snum;
	
	qboolean	link;

	// Ridah
	int			shaderAnim;
	int			roll;

	int			accumroll;

} cparticle_t;

typedef enum
{
	P_NONE,
	P_WEATHER,
	P_FLAT,
	P_SMOKE,
	P_ROTATE,
	P_WEATHER_TURBULENT,
	P_ANIM,	// Ridah
	P_BAT,
	P_BLEED,
	P_FLAT_SCALEUP,
	P_FLAT_SCALEUP_FADE,
	P_WEATHER_FLURRY,
	P_SMOKE_IMPACT,
	P_BUBBLE,
	P_BUBBLE_TURBULENT,
	P_SPRITE
} particle_type_t;

#define	MAX_SHADER_ANIMS		32
#define	MAX_SHADER_ANIM_FRAMES	64

static char *shaderAnimNames[MAX_SHADER_ANIMS] = {
	"explode1",
	"blacksmokeanim",
	"twiltb2",
	"expblue",
	"blacksmokeanimb",	// uses 'explode1' sequence
	"blood",
	NULL
};
static qhandle_t shaderAnims[MAX_SHADER_ANIMS][MAX_SHADER_ANIM_FRAMES];
static int	shaderAnimCounts[MAX_SHADER_ANIMS] = {
	23,
	25,
	45,
	25,
	23,
	5,
};
static float	shaderAnimSTRatio[MAX_SHADER_ANIMS] = {
	1.405f,
	1.0f,
	1.0f,
	1.0f,
	1.0f,
	1.0f,
};
static int	numShaderAnims;
// done.

#define		PARTICLE_GRAVITY	40
#define		MAX_PARTICLES	1024 * 8

cparticle_t	*active_particles, *free_particles;
cparticle_t	particles[MAX_PARTICLES];
int		cl_numparticles = MAX_PARTICLES;

qboolean		initparticles = qfalse;
vec3_t			vforward, vright, vup;
vec3_t			rforward, rright, rup;

float			oldtime;

/*
===============
CL_ClearParticles
===============
*/
void CG_ClearParticles (void)
{
	int		i;

	memset( particles, 0, sizeof(particles) );

	free_particles = &particles[0];
	active_particles = NULL;

	for (i=0 ;i<cl_numparticles ; i++)
	{
		particles[i].next = &particles[i+1];
		particles[i].type = 0;
	}
	particles[cl_numparticles-1].next = NULL;

	oldtime = cg.time;

	// Ridah, init the shaderAnims
	for (i=0; shaderAnimNames[i]; i++) {
		int j;

		for (j=0; j<shaderAnimCounts[i]; j++) {
			shaderAnims[i][j] = trap_R_RegisterShader( va("%s%i", shaderAnimNames[i], j+1) );
		}
	}
	numShaderAnims = i;
	// done.

	initparticles = qtrue;
}


/*
=====================
CG_AddParticleToScene
=====================
*/
void CG_AddParticleToScene (cparticle_t *p, vec3_t org, float alpha)
{

	vec3_t		point;
	polyVert_t	verts[4];
	float		width;
	float		height;
	float		time, time2;
	float		ratio;
	float		invratio;
	vec3_t		color;
	polyVert_t	TRIverts[3];
	vec3_t		rright2, rup2;

	if (p->type == P_WEATHER || p->type == P_WEATHER_TURBULENT || p->type == P_WEATHER_FLURRY
		|| p->type == P_BUBBLE || p->type == P_BUBBLE_TURBULENT)
	{// create a front facing polygon
			
		if (p->type != P_WEATHER_FLURRY)
		{
			if (p->type == P_BUBBLE || p->type == P_BUBBLE_TURBULENT)
			{
				if (org[2] > p->end)			
				{	
					p->time = cg.time;	
					VectorCopy (org, p->org); // Ridah, fixes rare snow flakes that flicker on the ground
									
					p->org[2] = ( p->start + crandom () * 4 );
					
					
					if (p->type == P_BUBBLE_TURBULENT)
					{
						p->vel[0] = crandom() * 4;
						p->vel[1] = crandom() * 4;
					}
				
				}
			}
			else
			{
				if (org[2] < p->end)			
				{	
					p->time = cg.time;	
					VectorCopy (org, p->org); // Ridah, fixes rare snow flakes that flicker on the ground
									
					while (p->org[2] < p->end) 
					{
						p->org[2] += (p->start - p->end); 
					}
					
					
					if (p->type == P_WEATHER_TURBULENT)
					{
						p->vel[0] = crandom() * 16;
						p->vel[1] = crandom() * 16;
					}
				
				}
			}
			

			// Rafael snow pvs check
			if (!p->link)
				return;

			p->alpha = 1;
		}
		
		// Ridah, had to do this or MAX_POLYS is being exceeded in village1.bsp
		if (Distance( cg.snap->ps.origin, org ) > 1024) {
			return;
		}
		// done.
	
		if (p->type == P_BUBBLE || p->type == P_BUBBLE_TURBULENT)
		{
			VectorMA (org, -p->height, vup, point);	
			VectorMA (point, -p->width, vright, point);	
			VectorCopy (point, verts[0].xyz);	
			verts[0].st[0] = 0;	
			verts[0].st[1] = 0;	
			verts[0].modulate[0] = 255;	
			verts[0].modulate[1] = 255;	
			verts[0].modulate[2] = 255;	
			verts[0].modulate[3] = 255 * p->alpha;	

			VectorMA (org, -p->height, vup, point);	
			VectorMA (point, p->width, vright, point);	
			VectorCopy (point, verts[1].xyz);	
			verts[1].st[0] = 0;	
			verts[1].st[1] = 1;	
			verts[1].modulate[0] = 255;	
			verts[1].modulate[1] = 255;	
			verts[1].modulate[2] = 255;	
			verts[1].modulate[3] = 255 * p->alpha;	

			VectorMA (org, p->height, vup, point);	
			VectorMA (point, p->width, vright, point);	
			VectorCopy (point, verts[2].xyz);	
			verts[2].st[0] = 1;	
			verts[2].st[1] = 1;	
			verts[2].modulate[0] = 255;	
			verts[2].modulate[1] = 255;	
			verts[2].modulate[2] = 255;	
			verts[2].modulate[3] = 255 * p->alpha;	

			VectorMA (org, p->height, vup, point);	
			VectorMA (point, -p->width, vright, point);	
			VectorCopy (point, verts[3].xyz);	
			verts[3].st[0] = 1;	
			verts[3].st[1] = 0;	
			verts[3].modulate[0] = 255;	
			verts[3].modulate[1] = 255;	
			verts[3].modulate[2] = 255;	
			verts[3].modulate[3] = 255 * p->alpha;	
		}
		else
		{
			VectorMA (org, -p->height, vup, point);	
			VectorMA (point, -p->width, vright, point);	
			VectorCopy( point, TRIverts[0].xyz );
			TRIverts[0].st[0] = 1;
			TRIverts[0].st[1] = 0;
			TRIverts[0].modulate[0] = 255;
			TRIverts[0].modulate[1] = 255;
			TRIverts[0].modulate[2] = 255;
			TRIverts[0].modulate[3] = 255 * p->alpha;	

			VectorMA (org, p->height, vup, point);	
			VectorMA (point, -p->width, vright, point);	
			VectorCopy (point, TRIverts[1].xyz);	
			TRIverts[1].st[0] = 0;
			TRIverts[1].st[1] = 0;
			TRIverts[1].modulate[0] = 255;
			TRIverts[1].modulate[1] = 255;
			TRIverts[1].modulate[2] = 255;
			TRIverts[1].modulate[3] = 255 * p->alpha;	

			VectorMA (org, p->height, vup, point);	
			VectorMA (point, p->width, vright, point);	
			VectorCopy (point, TRIverts[2].xyz);	
			TRIverts[2].st[0] = 0;
			TRIverts[2].st[1] = 1;
			TRIverts[2].modulate[0] = 255;
			TRIverts[2].modulate[1] = 255;
			TRIverts[2].modulate[2] = 255;
			TRIverts[2].modulate[3] = 255 * p->alpha;	
		}
	
	}
	else if (p->type == P_SPRITE)
	{
		vec3_t	rr, ru;
		vec3_t	rotate_ang;

		VectorSet (color, 1.0, 1.0, 1.0);
		time = cg.time - p->time;
		time2 = p->endtime - p->time;
		ratio = time / time2;

		width = p->width + ( ratio * ( p->endwidth - p->width) );
		height = p->height + ( ratio * ( p->endheight - p->height) );

		if (p->roll) {
			vectoangles( cg.refdef.viewaxis[0], rotate_ang );
			rotate_ang[ROLL] += p->roll;
			AngleVectors ( rotate_ang, NULL, rr, ru);
		}

		if (p->roll) {
			VectorMA (org, -height, ru, point);	
			VectorMA (point, -width, rr, point);	
		} else {
			VectorMA (org, -height, vup, point);	
			VectorMA (point, -width, vright, point);	
		}
		VectorCopy (point, verts[0].xyz);	
		verts[0].st[0] = 0;	
		verts[0].st[1] = 0;	
		verts[0].modulate[0] = 255;	
		verts[0].modulate[1] = 255;	
		verts[0].modulate[2] = 255;	
		verts[0].modulate[3] = 255;

		if (p->roll) {
			VectorMA (point, 2*height, ru, point);	
		} else {
			VectorMA (point, 2*height, vup, point);	
		}
		VectorCopy (point, verts[1].xyz);	
		verts[1].st[0] = 0;	
		verts[1].st[1] = 1;	
		verts[1].modulate[0] = 255;	
		verts[1].modulate[1] = 255;	
		verts[1].modulate[2] = 255;	
		verts[1].modulate[3] = 255;	

		if (p->roll) {
			VectorMA (point, 2*width, rr, point);	
		} else {
			VectorMA (point, 2*width, vright, point);	
		}
		VectorCopy (point, verts[2].xyz);	
		verts[2].st[0] = 1;	
		verts[2].st[1] = 1;	
		verts[2].modulate[0] = 255;	
		verts[2].modulate[1] = 255;	
		verts[2].modulate[2] = 255;	
		verts[2].modulate[3] = 255;	

		if (p->roll) {
			VectorMA (point, -2*height, ru, point);	
		} else {
			VectorMA (point, -2*height, vup, point);	
		}
		VectorCopy (point, verts[3].xyz);	
		verts[3].st[0] = 1;	
		verts[3].st[1] = 0;	
		verts[3].modulate[0] = 255;	
		verts[3].modulate[1] = 255;	
		verts[3].modulate[2] = 255;	
		verts[3].modulate[3] = 255;	
	}
	else if (p->type == P_SMOKE || p->type == P_SMOKE_IMPACT)
	{// create a front rotating facing polygon

		if ( p->type == P_SMOKE_IMPACT && Distance( cg.snap->ps.origin, org ) > 1024) {
			return;
		}

		if (p->color == BLOODRED)
			VectorSet (color, 0.22f, 0.0f, 0.0f);
		else if (p->color == GREY75)
		{
			float	len;
			float	greyit;
			float	val;
			len = Distance (cg.snap->ps.origin, org);
			if (!len)
				len = 1;

			val = 4096/len;
			greyit = 0.25 * val;
			if (greyit > 0.5)
				greyit = 0.5;

			VectorSet (color, greyit, greyit, greyit);
		}
		else
			VectorSet (color, 1.0, 1.0, 1.0);

		time = cg.time - p->time;
		time2 = p->endtime - p->time;
		ratio = time / time2;
		
		if (cg.time > p->startfade)
		{
			invratio = 1 - ( (cg.time - p->startfade) / (p->endtime - p->startfade) );

			if (p->color == EMISIVEFADE)
			{
				float fval;
				fval = (invratio * invratio);
				if (fval < 0)
					fval = 0;
				VectorSet (color, fval , fval , fval );
			}
			invratio *= p->alpha;
		}
		else 
			invratio = 1 * p->alpha;

		if ( cgs.glconfig.hardwareType == GLHW_RAGEPRO )
			invratio = 1;

		if (invratio > 1)
			invratio = 1;
	
		width = p->width + ( ratio * ( p->endwidth - p->width) );
		height = p->height + ( ratio * ( p->endheight - p->height) );

		if (p->type != P_SMOKE_IMPACT)
		{
			vec3_t temp;

			vectoangles (rforward, temp);
			p->accumroll += p->roll;
			temp[ROLL] += p->accumroll * 0.1;
			AngleVectors ( temp, NULL, rright2, rup2);
		}
		else
		{
			VectorCopy (rright, rright2);
			VectorCopy (rup, rup2);
		}
		
		if (p->rotate)
		{
			VectorMA (org, -height, rup2, point);	
			VectorMA (point, -width, rright2, point);	
		}
		else
		{
			VectorMA (org, -p->height, vup, point);	
			VectorMA (point, -p->width, vright, point);	
		}
		VectorCopy (point, verts[0].xyz);	
		verts[0].st[0] = 0;	
		verts[0].st[1] = 0;	
		verts[0].modulate[0] = 255 * color[0];	
		verts[0].modulate[1] = 255 * color[1];	
		verts[0].modulate[2] = 255 * color[2];	
		verts[0].modulate[3] = 255 * invratio;	

		if (p->rotate)
		{
			VectorMA (org, -height, rup2, point);	
			VectorMA (point, width, rright2, point);	
		}
		else
		{
			VectorMA (org, -p->height, vup, point);	
			VectorMA (point, p->width, vright, point);	
		}
		VectorCopy (point, verts[1].xyz);	
		verts[1].st[0] = 0;	
		verts[1].st[1] = 1;	
		verts[1].modulate[0] = 255 * color[0];	
		verts[1].modulate[1] = 255 * color[1];	
		verts[1].modulate[2] = 255 * color[2];	
		verts[1].modulate[3] = 255 * invratio;	

		if (p->rotate)
		{
			VectorMA (org, height, rup2, point);	
			VectorMA (point, width, rright2, point);	
		}
		else
		{
			VectorMA (org, p->height, vup, point);	
			VectorMA (point, p->width, vright, point);	
		}
		VectorCopy (point, verts[2].xyz);	
		verts[2].st[0] = 1;	
		verts[2].st[1] = 1;	
		verts[2].modulate[0] = 255 * color[0];	
		verts[2].modulate[1] = 255 * color[1];	
		verts[2].modulate[2] = 255 * color[2];	
		verts[2].modulate[3] = 255 * invratio;	

		if (p->rotate)
		{
			VectorMA (org, height, rup2, point);	
			VectorMA (point, -width, rright2, point);	
		}
		else
		{
			VectorMA (org, p->height, vup, point);	
			VectorMA (point, -p->width, vright, point);	
		}
		VectorCopy (point, verts[3].xyz);	
		verts[3].st[0] = 1;	
		verts[3].st[1] = 0;	
		verts[3].modulate[0] = 255 * color[0];	
		verts[3].modulate[1] = 255 * color[1];	
		verts[3].modulate[2] = 255 * color[2];	
		verts[3].modulate[3] = 255  * invratio;	
		
	}
	else if (p->type == P_BLEED)
	{
		vec3_t	rr, ru;
		vec3_t	rotate_ang;
		float	alpha;

		alpha = p->alpha;
		
		if ( cgs.glconfig.hardwareType == GLHW_RAGEPRO )
			alpha = 1;

		if (p->roll) 
		{
			vectoangles( cg.refdef.viewaxis[0], rotate_ang );
			rotate_ang[ROLL] += p->roll;
			AngleVectors ( rotate_ang, NULL, rr, ru);
		}
		else
		{
			VectorCopy (vup, ru);
			VectorCopy (vright, rr);
		}

		VectorMA (org, -p->height, ru, point);	
		VectorMA (point, -p->width, rr, point);	
		VectorCopy (point, verts[0].xyz);	
		verts[0].st[0] = 0;	
		verts[0].st[1] = 0;	
		verts[0].modulate[0] = 111;	
		verts[0].modulate[1] = 19;	
		verts[0].modulate[2] = 9;	
		verts[0].modulate[3] = 255 * alpha;	

		VectorMA (org, -p->height, ru, point);	
		VectorMA (point, p->width, rr, point);	
		VectorCopy (point, verts[1].xyz);	
		verts[1].st[0] = 0;	
		verts[1].st[1] = 1;	
		verts[1].modulate[0] = 111;	
		verts[1].modulate[1] = 19;	
		verts[1].modulate[2] = 9;	
		verts[1].modulate[3] = 255 * alpha;	

		VectorMA (org, p->height, ru, point);	
		VectorMA (point, p->width, rr, point);	
		VectorCopy (point, verts[2].xyz);	
		verts[2].st[0] = 1;	
		verts[2].st[1] = 1;	
		verts[2].modulate[0] = 111;	
		verts[2].modulate[1] = 19;	
		verts[2].modulate[2] = 9;	
		verts[2].modulate[3] = 255 * alpha;	

		VectorMA (org, p->height, ru, point);	
		VectorMA (point, -p->width, rr, point);	
		VectorCopy (point, verts[3].xyz);	
		verts[3].st[0] = 1;	
		verts[3].st[1] = 0;	
		verts[3].modulate[0] = 111;	
		verts[3].modulate[1] = 19;	
		verts[3].modulate[2] = 9;	
		verts[3].modulate[3] = 255 * alpha;	

	}
	else if (p->type == P_FLAT_SCALEUP)
	{
		float width, height;
		float sinR, cosR;

		if (p->color == BLOODRED)
			VectorSet (color, 1, 1, 1);
		else
			VectorSet (color, 0.5, 0.5, 0.5);
		
		time = cg.time - p->time;
		time2 = p->endtime - p->time;
		ratio = time / time2;

		width = p->width + ( ratio * ( p->endwidth - p->width) );
		height = p->height + ( ratio * ( p->endheight - p->height) );

		if (width > p->endwidth)
			width = p->endwidth;

		if (height > p->endheight)
			height = p->endheight;

		sinR = height * sin(DEG2RAD(p->roll)) * sqrt(2);
		cosR = width * cos(DEG2RAD(p->roll)) * sqrt(2);

		VectorCopy (org, verts[0].xyz);	
		verts[0].xyz[0] -= sinR;
		verts[0].xyz[1] -= cosR;
		verts[0].st[0] = 0;	
		verts[0].st[1] = 0;	
		verts[0].modulate[0] = 255 * color[0];	
		verts[0].modulate[1] = 255 * color[1];	
		verts[0].modulate[2] = 255 * color[2];	
		verts[0].modulate[3] = 255;	

		VectorCopy (org, verts[1].xyz);	
		verts[1].xyz[0] -= cosR;	
		verts[1].xyz[1] += sinR;	
		verts[1].st[0] = 0;	
		verts[1].st[1] = 1;	
		verts[1].modulate[0] = 255 * color[0];	
		verts[1].modulate[1] = 255 * color[1];	
		verts[1].modulate[2] = 255 * color[2];	
		verts[1].modulate[3] = 255;	

		VectorCopy (org, verts[2].xyz);	
		verts[2].xyz[0] += sinR;	
		verts[2].xyz[1] += cosR;	
		verts[2].st[0] = 1;	
		verts[2].st[1] = 1;	
		verts[2].modulate[0] = 255 * color[0];	
		verts[2].modulate[1] = 255 * color[1];	
		verts[2].modulate[2] = 255 * color[2];	
		verts[2].modulate[3] = 255;	

		VectorCopy (org, verts[3].xyz);	
		verts[3].xyz[0] += cosR;	
		verts[3].xyz[1] -= sinR;	
		verts[3].st[0] = 1;	
		verts[3].st[1] = 0;	
		verts[3].modulate[0] = 255 * color[0];