r_mesh_anim.cpp

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/*
Copyright (C) 2002-2020 UFO: Alien Invasion.

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 2
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.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

#include "r_local.h"
#include "r_mesh.h"
#include "r_mesh_anim.h"

#define LOOPNEXT(x) ((x + 1 < MAX_ANIMLIST) ? x + 1 : 0)

static inline void R_AnimAdd (animState_t* as, const model_t* mod, const mAliasAnim_t* anim)
{
    assert(as->ladd < sizeof(as->list));

    as->list[as->ladd] = anim - mod->alias.animdata;

    /* advance in list (no overflow protection!) */
    as->ladd = LOOPNEXT(as->ladd);
}
#define R_AnimGetAliasAnim(mod, as) ((mod)->alias.animdata + (as)->list[(as)->lcur])

static const mAliasAnim_t* R_AnimGet (const model_t* mod, const char* name)
{
    mAliasAnim_t* anim;
    int i;

    if (!mod || !mod->alias.num_anims)
        return nullptr;

    for (i = 0, anim = mod->alias.animdata; i < mod->alias.num_anims; i++, anim++)
        if (Q_streq(name, anim->name))
            return anim;

    return nullptr;
}

void R_AnimAppend (animState_t* as, const model_t* mod, const char* name)
{
    const mAliasAnim_t* anim;

    if (!mod) {
        Com_Printf("R_AnimAppend: No model given (%s)\n", name);
        return;
    }

    if (!mod->alias.num_anims) {
        Com_Printf("R_AnimAppend: Model with no animations (%s) (model: %s)\n", name, mod->name);
        return;
    }

    /* get animation */
    anim = R_AnimGet(mod, name);
    if (!anim) {
        Com_Printf("R_AnimAppend: No such animation: %s (model: %s)\n", name, mod->name);
        return;
    }

    if (as->lcur == as->ladd) {
        /* first animation */
        as->oldframe = anim->from;
        if (anim->to > anim->from)
            as->frame = anim->from + 1;
        else
            as->frame = anim->from;

        as->backlerp = 0.0;
        as->time = anim->time;
        as->dt = 0;

        as->change = true;
    }

    R_AnimAdd(as, mod, anim);
}


void R_AnimChange (animState_t* as, const model_t* mod, const char* name)
{
    const mAliasAnim_t* anim;

    if (!mod) {
        Com_Printf("R_AnimChange: No model given (%s)\n", name);
        return;
    }

    if (!mod->alias.num_anims) {
        Com_Printf("R_AnimChange: Model with no animations (%s) (model: %s)\n", name, mod->name);
        return;
    }

    /* get animation */
    anim = R_AnimGet(mod, name);
    if (!anim) {
        Com_Printf("R_AnimChange: No such animation: %s (model: %s)\n", name, mod->name);
        return;
    }

    if (as->lcur == as->ladd) {
        /* first animation */
        as->oldframe = anim->from;
        if (anim->to > anim->from)
            as->frame = anim->from + 1;
        else
            as->frame = anim->from;

        as->backlerp = 1.0;
        as->time = anim->time;
        as->dt = 0;

        as->change = true;
    } else {
        /* next animation */
        as->ladd = LOOPNEXT(as->lcur);
        if (anim->time < as->time)
            as->time = anim->time;
        /* don't change to the same animation */
        if (anim != R_AnimGetAliasAnim(mod, as))
            as->change = true;
    }

    R_AnimAdd(as, mod, anim);
}


void R_AnimRun (animState_t* as, const model_t* mod, int msec)
{
    assert(as->lcur < MAX_ANIMLIST);

    if (!mod || !mod->alias.num_anims)
        return;

    if (as->lcur == as->ladd)
        return;

    as->dt += msec;

    while (as->dt > as->time) {
        const mAliasAnim_t* anim = R_AnimGetAliasAnim(mod, as);
        as->dt -= as->time;

        if (as->change || as->frame >= anim->to) {
            /* go to next animation if it isn't the last one */
            if (LOOPNEXT(as->lcur) != as->ladd)
                as->lcur = LOOPNEXT(as->lcur);

            anim = R_AnimGetAliasAnim(mod, as);

            /* prepare next frame */
            as->dt = 0;
            as->time = anim->time;
            as->oldframe = as->frame;
            as->frame = anim->from;
            as->change = false;
        } else {
            /* next frame of the same animation */
            as->time = anim->time;
            as->oldframe = as->frame;
            as->frame++;
        }
    }

    as->backlerp = 1.0 - (float) as->dt / as->time;
}

const char* R_AnimGetName (const animState_t* as, const model_t* mod)
{
    const mAliasAnim_t* anim;

    assert(as->lcur < MAX_ANIMLIST);

    if (!mod || !mod->alias.num_anims)
        return nullptr;

    if (as->lcur == as->ladd)
        return nullptr;

    anim = R_AnimGetAliasAnim(mod, as);
    return anim->name;
}