mirror of
https://github.com/w23/xash3d-fwgs
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297 lines
7.9 KiB
C
297 lines
7.9 KiB
C
/*
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cl_part.c - particles and tracers
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Copyright (C) 2010 Uncle Mike
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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#include "gl_local.h"
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#include "r_efx.h"
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#include "event_flags.h"
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#include "entity_types.h"
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#include "triangleapi.h"
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#include "pm_local.h"
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#include "cl_tent.h"
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#include "studio.h"
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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 };
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static color24 gTracerColors[] =
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{
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{ 255, 255, 255 }, // White
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{ 255, 0, 0 }, // Red
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{ 0, 255, 0 }, // Green
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{ 0, 0, 255 }, // Blue
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{ 0, 0, 0 }, // Tracer default, filled in from cvars, etc.
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{ 255, 167, 17 }, // Yellow-orange sparks
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{ 255, 130, 90 }, // Yellowish streaks (garg)
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{ 55, 60, 144 }, // Blue egon streak
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{ 255, 130, 90 }, // More Yellowish streaks (garg)
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{ 255, 140, 90 }, // More Yellowish streaks (garg)
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{ 200, 130, 90 }, // More red streaks (garg)
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{ 255, 120, 70 }, // Darker red streaks (garg)
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};
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/*
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================
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CL_DrawParticles
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update particle color, position, free expired and draw it
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================
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*/
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void CL_DrawParticles( double frametime, particle_t *cl_active_particles, float partsize )
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{
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particle_t *p;
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vec3_t right, up;
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color24 *pColor;
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int alpha;
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float size;
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if( !cl_active_particles )
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return; // nothing to draw?
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pglEnable( GL_BLEND );
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pglDisable( GL_ALPHA_TEST );
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pglBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
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GL_Bind( XASH_TEXTURE0, tr.particleTexture );
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pglTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
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pglDepthMask( GL_FALSE );
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pglBegin( GL_QUADS );
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for( p = cl_active_particles; p; p = p->next )
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{
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if(( p->type != pt_blob ) || ( p->packedColor == 255 ))
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{
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size = partsize; // get initial size of particle
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// scale up to keep particles from disappearing
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size += (p->org[0] - RI.vieworg[0]) * RI.cull_vforward[0];
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size += (p->org[1] - RI.vieworg[1]) * RI.cull_vforward[1];
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size += (p->org[2] - RI.vieworg[2]) * RI.cull_vforward[2];
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if( size < 20.0f ) size = partsize;
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else size = partsize + size * 0.002f;
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// scale the axes by radius
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VectorScale( RI.cull_vright, size, right );
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VectorScale( RI.cull_vup, size, up );
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p->color = bound( 0, p->color, 255 );
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pColor = gEngfuncs.CL_GetPaletteColor( p->color );
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alpha = 255 * (p->die - gpGlobals->time) * 16.0f;
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if( alpha > 255 || p->type == pt_static )
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alpha = 255;
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pglColor4ub( gEngfuncs.LightToTexGamma( pColor->r ),
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gEngfuncs.LightToTexGamma( pColor->g ),
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gEngfuncs.LightToTexGamma( pColor->b ), alpha );
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pglTexCoord2f( 0.0f, 1.0f );
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pglVertex3f( p->org[0] - right[0] + up[0], p->org[1] - right[1] + up[1], p->org[2] - right[2] + up[2] );
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pglTexCoord2f( 0.0f, 0.0f );
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pglVertex3f( p->org[0] + right[0] + up[0], p->org[1] + right[1] + up[1], p->org[2] + right[2] + up[2] );
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pglTexCoord2f( 1.0f, 0.0f );
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pglVertex3f( p->org[0] + right[0] - up[0], p->org[1] + right[1] - up[1], p->org[2] + right[2] - up[2] );
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pglTexCoord2f( 1.0f, 1.0f );
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pglVertex3f( p->org[0] - right[0] - up[0], p->org[1] - right[1] - up[1], p->org[2] - right[2] - up[2] );
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r_stats.c_particle_count++;
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}
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gEngfuncs.CL_ThinkParticle( frametime, p );
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}
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pglEnd();
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pglDepthMask( GL_TRUE );
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}
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/*
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================
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CL_CullTracer
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check tracer bbox
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================
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*/
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static qboolean CL_CullTracer( particle_t *p, const vec3_t start, const vec3_t end )
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{
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vec3_t mins, maxs;
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int i;
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// compute the bounding box
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for( i = 0; i < 3; i++ )
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{
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if( start[i] < end[i] )
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{
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mins[i] = start[i];
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maxs[i] = end[i];
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}
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else
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{
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mins[i] = end[i];
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maxs[i] = start[i];
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}
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// don't let it be zero sized
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if( mins[i] == maxs[i] )
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{
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maxs[i] += gTracerSize[p->type] * 2.0f;
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}
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}
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// check bbox
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return R_CullBox( mins, maxs );
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}
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/*
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================
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CL_DrawTracers
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update tracer color, position, free expired and draw it
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================
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*/
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void CL_DrawTracers( double frametime, particle_t *cl_active_tracers )
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{
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float scale, atten, gravity;
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vec3_t screenLast, screen;
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vec3_t start, end, delta;
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particle_t *p;
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// update tracer color if this is changed
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if( FBitSet( tracerred->flags|tracergreen->flags|tracerblue->flags|traceralpha->flags, FCVAR_CHANGED ))
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{
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color24 *customColors = &gTracerColors[4];
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customColors->r = (byte)(tracerred->value * traceralpha->value * 255);
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customColors->g = (byte)(tracergreen->value * traceralpha->value * 255);
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customColors->b = (byte)(tracerblue->value * traceralpha->value * 255);
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ClearBits( tracerred->flags, FCVAR_CHANGED );
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ClearBits( tracergreen->flags, FCVAR_CHANGED );
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ClearBits( tracerblue->flags, FCVAR_CHANGED );
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ClearBits( traceralpha->flags, FCVAR_CHANGED );
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}
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if( !cl_active_tracers )
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return; // nothing to draw?
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if( !TriSpriteTexture( gEngfuncs.GetDefaultSprite( REF_DOT_SPRITE ), 0 ))
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return;
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pglEnable( GL_BLEND );
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pglBlendFunc( GL_SRC_ALPHA, GL_ONE );
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pglDisable( GL_ALPHA_TEST );
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pglDepthMask( GL_FALSE );
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gravity = frametime * MOVEVARS->gravity;
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scale = 1.0 - (frametime * 0.9);
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if( scale < 0.0f ) scale = 0.0f;
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for( p = cl_active_tracers; p; p = p->next )
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{
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atten = (p->die - gpGlobals->time);
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if( atten > 0.1f ) atten = 0.1f;
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VectorScale( p->vel, ( p->ramp * atten ), delta );
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VectorAdd( p->org, delta, end );
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VectorCopy( p->org, start );
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if( !CL_CullTracer( p, start, end ))
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{
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vec3_t verts[4], tmp2;
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vec3_t tmp, normal;
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color24 *pColor;
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// Transform point into screen space
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TriWorldToScreen( start, screen );
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TriWorldToScreen( end, screenLast );
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// build world-space normal to screen-space direction vector
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VectorSubtract( screen, screenLast, tmp );
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// we don't need Z, we're in screen space
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tmp[2] = 0;
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VectorNormalize( tmp );
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// build point along noraml line (normal is -y, x)
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VectorScale( RI.cull_vup, tmp[0] * gTracerSize[p->type], normal );
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VectorScale( RI.cull_vright, -tmp[1] * gTracerSize[p->type], tmp2 );
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VectorSubtract( normal, tmp2, normal );
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// compute four vertexes
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VectorSubtract( start, normal, verts[0] );
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VectorAdd( start, normal, verts[1] );
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VectorAdd( verts[0], delta, verts[2] );
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VectorAdd( verts[1], delta, verts[3] );
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if( p->color > sizeof( gTracerColors ) / sizeof( color24 ) )
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{
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gEngfuncs.Con_Printf( S_ERROR "UserTracer with color > %d\n", sizeof( gTracerColors ) / sizeof( color24 ));
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p->color = 0;
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}
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pColor = &gTracerColors[p->color];
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pglColor4ub( pColor->r, pColor->g, pColor->b, p->packedColor );
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pglBegin( GL_QUADS );
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pglTexCoord2f( 0.0f, 0.8f );
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pglVertex3fv( verts[2] );
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pglTexCoord2f( 1.0f, 0.8f );
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pglVertex3fv( verts[3] );
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pglTexCoord2f( 1.0f, 0.0f );
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pglVertex3fv( verts[1] );
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pglTexCoord2f( 0.0f, 0.0f );
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pglVertex3fv( verts[0] );
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pglEnd();
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}
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// evaluate position
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VectorMA( p->org, frametime, p->vel, p->org );
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if( p->type == pt_grav )
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{
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p->vel[0] *= scale;
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p->vel[1] *= scale;
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p->vel[2] -= gravity;
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p->packedColor = 255 * (p->die - gpGlobals->time) * 2;
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if( p->packedColor > 255 ) p->packedColor = 255;
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}
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else if( p->type == pt_slowgrav )
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{
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p->vel[2] = gravity * 0.05f;
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}
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}
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pglDepthMask( GL_TRUE );
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}
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/*
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===============
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CL_DrawParticlesExternal
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allow to draw effects from custom renderer
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===============
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*/
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void CL_DrawParticlesExternal( const ref_viewpass_t *rvp, qboolean trans_pass, float frametime )
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{
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ref_instance_t oldRI = RI;
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memcpy( &oldRI, &RI, sizeof( ref_instance_t ));
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R_SetupRefParams( rvp );
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R_SetupFrustum();
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R_SetupGL( false ); // don't touch GL-states
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tr.frametime = frametime;
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gEngfuncs.CL_DrawEFX( frametime, trans_pass );
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// restore internal state
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memcpy( &RI, &oldRI, sizeof( ref_instance_t ));
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}
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