Xash3D FWGS engine.
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/*
cl_part.c - particles and tracers
Copyright (C) 2010 Uncle Mike
This program 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 3 of the License, or
(at your option) any later version.
This program 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.
*/
#include "gl_local.h"
#include "r_efx.h"
#include "event_flags.h"
#include "entity_types.h"
#include "triangleapi.h"
#include "pm_local.h"
#include "cl_tent.h"
#include "studio.h"
#define PART_SIZE Q_max( 0.5f, cl_draw_particles->value )
static float gTracerSize[11] = { 1.5f, 0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f };
/*
================
CL_DrawParticles
update particle color, position, free expired and draw it
================
*/
void CL_DrawParticles( double frametime, particle_t *cl_active_particles )
{
particle_t *p;
vec3_t right, up;
color24 *pColor;
int alpha;
float size;
if( !cl_draw_particles->value )
return;
if( !cl_active_particles )
return; // nothing to draw?
pglEnable( GL_BLEND );
pglDisable( GL_ALPHA_TEST );
pglBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
GL_Bind( XASH_TEXTURE0, tr.particleTexture );
pglTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
pglDepthMask( GL_FALSE );
pglBegin( GL_QUADS );
for( p = cl_active_particles; p; p = p->next )
{
if(( p->type != pt_blob ) || ( p->packedColor == 255 ))
{
size = PART_SIZE; // get initial size of particle
// scale up to keep particles from disappearing
size += (p->org[0] - RI.vieworg[0]) * RI.cull_vforward[0];
size += (p->org[1] - RI.vieworg[1]) * RI.cull_vforward[1];
size += (p->org[2] - RI.vieworg[2]) * RI.cull_vforward[2];
if( size < 20.0f ) size = PART_SIZE;
else size = PART_SIZE + size * 0.002f;
// scale the axes by radius
VectorScale( RI.cull_vright, size, right );
VectorScale( RI.cull_vup, size, up );
p->color = bound( 0, p->color, 255 );
pColor = gEngfuncs.CL_GetPaletteColor( p->color );
alpha = 255 * (p->die - gpGlobals->time) * 16.0f;
if( alpha > 255 || p->type == pt_static )
alpha = 255;
pglColor4ub( gEngfuncs.LightToTexGamma( pColor->r ),
gEngfuncs.LightToTexGamma( pColor->g ),
gEngfuncs.LightToTexGamma( pColor->b ), alpha );
pglTexCoord2f( 0.0f, 1.0f );
pglVertex3f( p->org[0] - right[0] + up[0], p->org[1] - right[1] + up[1], p->org[2] - right[2] + up[2] );
pglTexCoord2f( 0.0f, 0.0f );
pglVertex3f( p->org[0] + right[0] + up[0], p->org[1] + right[1] + up[1], p->org[2] + right[2] + up[2] );
pglTexCoord2f( 1.0f, 0.0f );
pglVertex3f( p->org[0] + right[0] - up[0], p->org[1] + right[1] - up[1], p->org[2] + right[2] - up[2] );
pglTexCoord2f( 1.0f, 1.0f );
pglVertex3f( p->org[0] - right[0] - up[0], p->org[1] - right[1] - up[1], p->org[2] - right[2] - up[2] );
r_stats.c_particle_count++;
}
gEngfuncs.CL_ThinkParticle( frametime, p );
}
pglEnd();
pglDepthMask( GL_TRUE );
}
/*
================
CL_CullTracer
check tracer bbox
================
*/
static qboolean CL_CullTracer( particle_t *p, const vec3_t start, const vec3_t end )
{
vec3_t mins, maxs;
int i;
// compute the bounding box
for( i = 0; i < 3; i++ )
{
if( start[i] < end[i] )
{
mins[i] = start[i];
maxs[i] = end[i];
}
else
{
mins[i] = end[i];
maxs[i] = start[i];
}
// don't let it be zero sized
if( mins[i] == maxs[i] )
{
maxs[i] += gTracerSize[p->type] * 2.0f;
}
}
// check bbox
return R_CullBox( mins, maxs );
}
/*
================
CL_DrawTracers
update tracer color, position, free expired and draw it
================
*/
void CL_DrawTracers( double frametime, particle_t *cl_active_tracers )
{
float scale, atten, gravity;
vec3_t screenLast, screen;
vec3_t start, end, delta;
particle_t *p;
if( !cl_draw_tracers->value )
return;
// update tracer color if this is changed
if( FBitSet( tracerred->flags|tracergreen->flags|tracerblue->flags|traceralpha->flags, FCVAR_CHANGED ))
{
color24 *customColors = gEngfuncs.GetTracerColors( 4 );
customColors->r = (byte)(tracerred->value * traceralpha->value * 255);
customColors->g = (byte)(tracergreen->value * traceralpha->value * 255);
customColors->b = (byte)(tracerblue->value * traceralpha->value * 255);
ClearBits( tracerred->flags, FCVAR_CHANGED );
ClearBits( tracergreen->flags, FCVAR_CHANGED );
ClearBits( tracerblue->flags, FCVAR_CHANGED );
ClearBits( traceralpha->flags, FCVAR_CHANGED );
}
if( !cl_active_tracers )
return; // nothing to draw?
if( !TriSpriteTexture( cl_sprite_dot, 0 ))
return;
pglEnable( GL_BLEND );
pglBlendFunc( GL_SRC_ALPHA, GL_ONE );
pglDisable( GL_ALPHA_TEST );
pglDepthMask( GL_FALSE );
gravity = frametime * MOVEVARS->gravity;
scale = 1.0 - (frametime * 0.9);
if( scale < 0.0f ) scale = 0.0f;
for( p = cl_active_tracers; p; p = p->next )
{
atten = (p->die - gpGlobals->time);
if( atten > 0.1f ) atten = 0.1f;
VectorScale( p->vel, ( p->ramp * atten ), delta );
VectorAdd( p->org, delta, end );
VectorCopy( p->org, start );
if( !CL_CullTracer( p, start, end ))
{
vec3_t verts[4], tmp2;
vec3_t tmp, normal;
color24 *pColor;
// Transform point into screen space
TriWorldToScreen( start, screen );
TriWorldToScreen( end, screenLast );
// build world-space normal to screen-space direction vector
VectorSubtract( screen, screenLast, tmp );
// we don't need Z, we're in screen space
tmp[2] = 0;
VectorNormalize( tmp );
// build point along noraml line (normal is -y, x)
VectorScale( RI.cull_vup, tmp[0] * gTracerSize[p->type], normal );
VectorScale( RI.cull_vright, -tmp[1] * gTracerSize[p->type], tmp2 );
VectorSubtract( normal, tmp2, normal );
// compute four vertexes
VectorSubtract( start, normal, verts[0] );
VectorAdd( start, normal, verts[1] );
VectorAdd( verts[0], delta, verts[2] );
VectorAdd( verts[1], delta, verts[3] );
pColor = gEngfuncs.GetTracerColors( p->color );
pglColor4ub( pColor->r, pColor->g, pColor->b, p->packedColor );
pglBegin( GL_QUADS );
pglTexCoord2f( 0.0f, 0.8f );
pglVertex3fv( verts[2] );
pglTexCoord2f( 1.0f, 0.8f );
pglVertex3fv( verts[3] );
pglTexCoord2f( 1.0f, 0.0f );
pglVertex3fv( verts[1] );
pglTexCoord2f( 0.0f, 0.0f );
pglVertex3fv( verts[0] );
pglEnd();
}
// evaluate position
VectorMA( p->org, frametime, p->vel, p->org );
if( p->type == pt_grav )
{
p->vel[0] *= scale;
p->vel[1] *= scale;
p->vel[2] -= gravity;
p->packedColor = 255 * (p->die - gpGlobals->time) * 2;
if( p->packedColor > 255 ) p->packedColor = 255;
}
else if( p->type == pt_slowgrav )
{
p->vel[2] = gravity * 0.05;
}
}
pglDepthMask( GL_TRUE );
}
/*
===============
CL_DrawParticlesExternal
allow to draw effects from custom renderer
===============
*/
void CL_DrawParticlesExternal( const ref_viewpass_t *rvp, qboolean trans_pass, float frametime )
{
ref_instance_t oldRI = RI;
memcpy( &oldRI, &RI, sizeof( ref_instance_t ));
R_SetupRefParams( rvp );
R_SetupFrustum();
R_SetupGL( false ); // don't touch GL-states
// setup PVS for frame
memcpy( RI.visbytes, tr.visbytes, gpGlobals->visbytes );
tr.frametime = frametime;
CL_DrawEFX( frametime, trans_pass );
// restore internal state
memcpy( &RI, &oldRI, sizeof( ref_instance_t ));
}