Maximum CD 2000 March/maximum-cd-2000-03.iso/Quake3 Game Source/Q3AGameSource.exe/Main/cg_localents.c

C/C++ Source or Header | 2000-01-18 | 13.3 KB | 572 lines

// Copyright (C) 1999-2000 Id Software, Inc.
//

// cg_localents.c -- every frame, generate renderer commands for locally
// processed entities, like smoke puffs, gibs, shells, etc.

#include "cg_local.h"

#define    MAX_LOCAL_ENTITIES    512
localEntity_t    cg_localEntities[MAX_LOCAL_ENTITIES];
localEntity_t    cg_activeLocalEntities;        // double linked list
localEntity_t    *cg_freeLocalEntities;        // single linked list

/*
===================
CG_InitLocalEntities

This is called at startup and for tournement restarts
===================
*/
void    CG_InitLocalEntities( void ) {
    int        i;

    memset( cg_localEntities, 0, sizeof( cg_localEntities ) );
    cg_activeLocalEntities.next = &cg_activeLocalEntities;
    cg_activeLocalEntities.prev = &cg_activeLocalEntities;
    cg_freeLocalEntities = cg_localEntities;
    for ( i = 0 ; i < MAX_LOCAL_ENTITIES - 1 ; i++ ) {
        cg_localEntities[i].next = &cg_localEntities[i+1];
    }
}


/*
==================
CG_FreeLocalEntity
==================
*/
void CG_FreeLocalEntity( localEntity_t *le ) {
    if ( !le->prev ) {
        CG_Error( "CG_FreeLocalEntity: not active" );
    }

    // remove from the doubly linked active list
    le->prev->next = le->next;
    le->next->prev = le->prev;

    // the free list is only singly linked
    le->next = cg_freeLocalEntities;
    cg_freeLocalEntities = le;
}

/*
===================
CG_AllocLocalEntity

Will allways succeed, even if it requires freeing an old active entity
===================
*/
localEntity_t    *CG_AllocLocalEntity( void ) {
    localEntity_t    *le;

    if ( !cg_freeLocalEntities ) {
        // no free entities, so free the one at the end of the chain
        // remove the oldest active entity
        CG_FreeLocalEntity( cg_activeLocalEntities.prev );
    }

    le = cg_freeLocalEntities;
    cg_freeLocalEntities = cg_freeLocalEntities->next;

    memset( le, 0, sizeof( *le ) );

    // link into the active list
    le->next = cg_activeLocalEntities.next;
    le->prev = &cg_activeLocalEntities;
    cg_activeLocalEntities.next->prev = le;
    cg_activeLocalEntities.next = le;
    return le;
}


/*
====================================================================================

FRAGMENT PROCESSING

A fragment localentity interacts with the environment in some way (hitting walls),
or generates more localentities along a trail.

====================================================================================
*/

/*
================
CG_BloodTrail

Leave expanding blood puffs behind gibs
================
*/
void CG_BloodTrail( localEntity_t *le ) {
    int        t;
    int        t2;
    int        step;
    vec3_t    newOrigin;
    localEntity_t    *blood;

    step = 150;
    t = step * ( (cg.time - cg.frametime + step ) / step );
    t2 = step * ( cg.time / step );

    for ( ; t <= t2; t += step ) {
        BG_EvaluateTrajectory( &le->pos, t, newOrigin );

        blood = CG_SmokePuff( newOrigin, vec3_origin,
                      20,        // radius
                      1, 1, 1, 1,    // color
                      2000,        // trailTime
                      t,        // startTime
                      0,        // flags
                      cgs.media.bloodTrailShader );
        // use the optimized version
        blood->leType = LE_FALL_SCALE_FADE;
        // drop a total of 40 units over its lifetime
        blood->pos.trDelta[2] = 40;
    }
}


/*
================
CG_FragmentBounceMark
================
*/
void CG_FragmentBounceMark( localEntity_t *le, trace_t *trace ) {
    int            radius;

    if ( le->leMarkType == LEMT_BLOOD ) {

        radius = 16 + (rand()&31);
        CG_ImpactMark( cgs.media.bloodMarkShader, trace->endpos, trace->plane.normal, random()*360,
            1,1,1,1, qtrue, radius, qfalse );
    }

    // don't allow a fragment to make multiple marks, or they
    // pile up while settling
    le->leMarkType = LEMT_NONE;
}

/*
================
CG_FragmentBounceSound
================
*/
void CG_FragmentBounceSound( localEntity_t *le, trace_t *trace ) {
    if ( le->leBounceSoundType == LEBS_BLOOD ) {
        // half the gibs will make splat sounds
        if ( rand() & 1 ) {
            int r = rand()&3;
            sfxHandle_t    s;

            if ( r < 2 ) {
                s = cgs.media.gibBounce1Sound;
            } else if ( r == 2 ) {
                s = cgs.media.gibBounce2Sound;
            } else {
                s = cgs.media.gibBounce3Sound;
            }
            trap_S_StartSound( trace->endpos, ENTITYNUM_WORLD, CHAN_AUTO, s );
        }
    } else if ( le->leBounceSoundType == LEBS_BRASS ) {

    }

    // don't allow a fragment to make multiple bounce sounds,
    // or it gets too noisy as they settle
    le->leBounceSoundType = LEBS_NONE;
}


/*
================
CG_ReflectVelocity
================
*/
void CG_ReflectVelocity( localEntity_t *le, trace_t *trace ) {
    vec3_t    velocity;
    float    dot;
    int        hitTime;

    // reflect the velocity on the trace plane
    hitTime = cg.time - cg.frametime + cg.frametime * trace->fraction;
    BG_EvaluateTrajectoryDelta( &le->pos, hitTime, velocity );
    dot = DotProduct( velocity, trace->plane.normal );
    VectorMA( velocity, -2*dot, trace->plane.normal, le->pos.trDelta );

    VectorScale( le->pos.trDelta, le->bounceFactor, le->pos.trDelta );

    VectorCopy( trace->endpos, le->pos.trBase );
    le->pos.trTime = cg.time;


    // check for stop, making sure that even on low FPS systems it doesn't bobble
    if ( trace->allsolid ||
        ( trace->plane.normal[2] > 0 &&
        ( le->pos.trDelta[2] < 40 || le->pos.trDelta[2] < -cg.frametime * le->pos.trDelta[2] ) ) ) {
        le->pos.trType = TR_STATIONARY;
    } else {

    }
}

/*
================
CG_AddFragment
================
*/
void CG_AddFragment( localEntity_t *le ) {
    vec3_t    newOrigin;
    trace_t    trace;

    if ( le->pos.trType == TR_STATIONARY ) {
        // sink into the ground if near the removal time
        int        t;
        float    oldZ;

        t = le->endTime - cg.time;
        if ( t < SINK_TIME ) {
            // we must use an explicit lighting origin, otherwise the
            // lighting would be lost as soon as the origin went
            // into the ground
            VectorCopy( le->refEntity.origin, le->refEntity.lightingOrigin );
            le->refEntity.renderfx |= RF_LIGHTING_ORIGIN;
            oldZ = le->refEntity.origin[2];
            le->refEntity.origin[2] -= 16 * ( 1.0 - (float)t / SINK_TIME );
            trap_R_AddRefEntityToScene( &le->refEntity );
            le->refEntity.origin[2] = oldZ;
        } else {
            trap_R_AddRefEntityToScene( &le->refEntity );
        }

        return;
    }

    // calculate new position
    BG_EvaluateTrajectory( &le->pos, cg.time, newOrigin );

    // trace a line from previous position to new position
    CG_Trace( &trace, le->refEntity.origin, NULL, NULL, newOrigin, -1, CONTENTS_SOLID );
    if ( trace.fraction == 1.0 ) {
        // still in free fall
        VectorCopy( newOrigin, le->refEntity.origin );

        if ( le->leFlags & LEF_TUMBLE ) {
            vec3_t angles;

            BG_EvaluateTrajectory( &le->angles, cg.time, angles );
            AnglesToAxis( angles, le->refEntity.axis );
        }

        trap_R_AddRefEntityToScene( &le->refEntity );

        // add a blood trail
        if ( le->leBounceSoundType == LEBS_BLOOD ) {
            CG_BloodTrail( le );
        }

        return;
    }

    // if it is in a nodrop zone, remove it
    // this keeps gibs from waiting at the bottom of pits of death
    // and floating levels
    if ( trap_CM_PointContents( trace.endpos, 0 ) & CONTENTS_NODROP ) {
        CG_FreeLocalEntity( le );
        return;
    }

    // leave a mark
    CG_FragmentBounceMark( le, &trace );

    // do a bouncy sound
    CG_FragmentBounceSound( le, &trace );

    // reflect the velocity on the trace plane
    CG_ReflectVelocity( le, &trace );

    trap_R_AddRefEntityToScene( &le->refEntity );
}

/*
=====================================================================

TRIVIAL LOCAL ENTITIES

These only do simple scaling or modulation before passing to the renderer
=====================================================================
*/

/*
====================
CG_AddFadeRGB
====================
*/
void CG_AddFadeRGB( localEntity_t *le ) {
    refEntity_t *re;
    float c;

    re = &le->refEntity;

    c = ( le->endTime - cg.time ) * le->lifeRate;
    c *= 0xff;

    re->shaderRGBA[0] = le->color[0] * c;
    re->shaderRGBA[1] = le->color[1] * c;
    re->shaderRGBA[2] = le->color[2] * c;
    re->shaderRGBA[3] = le->color[3] * c;

    trap_R_AddRefEntityToScene( re );
}

/*
==================
CG_AddMoveScaleFade
==================
*/
static void CG_AddMoveScaleFade( localEntity_t *le ) {
    refEntity_t    *re;
    float        c;
    vec3_t        delta;
    float        len;

    re = &le->refEntity;

    // fade / grow time
    c = ( le->endTime - cg.time ) * le->lifeRate;

    re->shaderRGBA[3] = 0xff * c * le->color[3];

    if ( !( le->leFlags & LEF_PUFF_DONT_SCALE ) ) {
        re->radius = le->radius * ( 1.0 - c ) + 8;
    }

    BG_EvaluateTrajectory( &le->pos, cg.time, re->origin );

    // if the view would be "inside" the sprite, kill the sprite
    // so it doesn't add too much overdraw
    VectorSubtract( re->origin, cg.refdef.vieworg, delta );
    len = VectorLength( delta );
    if ( len < le->radius ) {
        CG_FreeLocalEntity( le );
        return;
    }

    trap_R_AddRefEntityToScene( re );
}


/*
===================
CG_AddScaleFade

For rocket smokes that hang in place, fade out, and are
removed if the view passes through them.
There are often many of these, so it needs to be simple.
===================
*/
static void CG_AddScaleFade( localEntity_t *le ) {
    refEntity_t    *re;
    float        c;
    vec3_t        delta;
    float        len;

    re = &le->refEntity;

    // fade / grow time
    c = ( le->endTime - cg.time ) * le->lifeRate;

    re->shaderRGBA[3] = 0xff * c * le->color[3];
    re->radius = le->radius * ( 1.0 - c ) + 8;

    // if the view would be "inside" the sprite, kill the sprite
    // so it doesn't add too much overdraw
    VectorSubtract( re->origin, cg.refdef.vieworg, delta );
    len = VectorLength( delta );
    if ( len < le->radius ) {
        CG_FreeLocalEntity( le );
        return;
    }

    trap_R_AddRefEntityToScene( re );
}


/*
=================
CG_AddFallScaleFade

This is just an optimized CG_AddMoveScaleFade
For blood mists that drift down, fade out, and are
removed if the view passes through them.
There are often 100+ of these, so it needs to be simple.
=================
*/
static void CG_AddFallScaleFade( localEntity_t *le ) {
    refEntity_t    *re;
    float        c;
    vec3_t        delta;
    float        len;

    re = &le->refEntity;

    // fade time
    c = ( le->endTime - cg.time ) * le->lifeRate;

    re->shaderRGBA[3] = 0xff * c * le->color[3];

    re->origin[2] = le->pos.trBase[2] - ( 1.0 - c ) * le->pos.trDelta[2];

    re->radius = le->radius * ( 1.0 - c ) + 16;

    // if the view would be "inside" the sprite, kill the sprite
    // so it doesn't add too much overdraw
    VectorSubtract( re->origin, cg.refdef.vieworg, delta );
    len = VectorLength( delta );
    if ( len < le->radius ) {
        CG_FreeLocalEntity( le );
        return;
    }

    trap_R_AddRefEntityToScene( re );
}



/*
================
CG_AddExplosion
================
*/
static void CG_AddExplosion( localEntity_t *ex ) {
    refEntity_t    *ent;

    ent = &ex->refEntity;

    // add the entity
    trap_R_AddRefEntityToScene(ent);

    // add the dlight
    if ( ex->light ) {
        float        light;

        light = (float)( cg.time - ex->startTime ) / ( ex->endTime - ex->startTime );
        if ( light < 0.5 ) {
            light = 1.0;
        } else {
            light = 1.0 - ( light - 0.5 ) * 2;
        }
        light = ex->light * light;
        trap_R_AddLightToScene(ent->origin, light, ex->lightColor[0], ex->lightColor[1], ex->lightColor[2] );
    }
}

/*
================
CG_AddSpriteExplosion
================
*/
static void CG_AddSpriteExplosion( localEntity_t *le ) {
    refEntity_t    re;
    float c;

    re = le->refEntity;

    c = ( le->endTime - cg.time ) / ( float ) ( le->endTime - le->startTime );
    if ( c > 1 ) {
        c = 1.0;    // can happen during connection problems
    }

    re.shaderRGBA[0] = 0xff;
    re.shaderRGBA[1] = 0xff;
    re.shaderRGBA[2] = 0xff;
    re.shaderRGBA[3] = 0xff * c * 0.33;

    re.reType = RT_SPRITE;
    re.radius = 42 * ( 1.0 - c ) + 30;

    trap_R_AddRefEntityToScene( &re );

    // add the dlight
    if ( le->light ) {
        float        light;

        light = (float)( cg.time - le->startTime ) / ( le->endTime - le->startTime );
        if ( light < 0.5 ) {
            light = 1.0;
        } else {
            light = 1.0 - ( light - 0.5 ) * 2;
        }
        light = le->light * light;
        trap_R_AddLightToScene(re.origin, light, le->lightColor[0], le->lightColor[1], le->lightColor[2] );
    }
}


//==============================================================================

/*
===================
CG_AddLocalEntities

===================
*/
void CG_AddLocalEntities( void ) {
    localEntity_t    *le, *next;

    // walk the list backwards, so any new local entities generated
    // (trails, marks, etc) will be present this frame
    le = cg_activeLocalEntities.prev;
    for ( ; le != &cg_activeLocalEntities ; le = next ) {
        // grab next now, so if the local entity is freed we
        // still have it
        next = le->prev;

        if ( cg.time >= le->endTime ) {
            CG_FreeLocalEntity( le );
            continue;
        }
        switch ( le->leType ) {
        default:
            CG_Error( "Bad leType: %i", le->leType );
            break;

        case LE_MARK:
            break;

        case LE_SPRITE_EXPLOSION:
            CG_AddSpriteExplosion( le );
            break;

        case LE_EXPLOSION:
            CG_AddExplosion( le );
            break;

        case LE_FRAGMENT:            // gibs and brass
            CG_AddFragment( le );
            break;

        case LE_MOVE_SCALE_FADE:        // water bubbles
            CG_AddMoveScaleFade( le );
            break;

        case LE_FADE_RGB:                // teleporters, railtrails
            CG_AddFadeRGB( le );
            break;

        case LE_FALL_SCALE_FADE: // gib blood trails
            CG_AddFallScaleFade( le );
            break;

        case LE_SCALE_FADE:        // rocket trails
            CG_AddScaleFade( le );
            break;

        }
    }
}