cres.c

/*
# _____     ___ ____     ___ ____
#  ____|   |    ____|   |        | |____|
# |     ___|   |____ ___|    ____| |    \    PS2DEV Open Source Project.
#-----------------------------------------------------------------------
# Copyright ps2dev - http://www.ps2dev.org
# Licenced under Academic Free License version 2.0
# Review ps2sdk README & LICENSE files for further details.
*/
 
#include "libsnd2_internal.h"
 
void _SsSndCrescendo(s16 sep_no, s16 seq_no)
{
    libsnd2_sequence_struct_t *score_struct;
 
    score_struct = &_ss_score[sep_no][seq_no];
    score_struct->m_unkA0 += 1;
    if ( score_struct->m_unk9C >= score_struct->m_unkA0 )
    {
        int mulfield_tmp;
        int new_field_4a;
        int vol_inc_by;
 
        mulfield_tmp = score_struct->m_unk48 * score_struct->m_unkA0;
        new_field_4a = mulfield_tmp / score_struct->m_unk9C;
        if ( score_struct->m_unk9C == -1 && (unsigned int)mulfield_tmp == 0x80000000 )
            __builtin_trap();
        vol_inc_by = new_field_4a - score_struct->m_unk4A;
        if ( new_field_4a != score_struct->m_unk4A )
        {
            int voll_clamped;
            int volr_clamped;
            s16 seq_left_vol;
            s16 seq_right_vol;
 
            score_struct->m_unk4A = new_field_4a;
            _SsVmGetSeqVol(sep_no | (seq_no << 8), &seq_left_vol, &seq_right_vol);
            voll_clamped = (u16)seq_left_vol + vol_inc_by;
            if ( voll_clamped >= 128 )
                voll_clamped = 127;
            if ( voll_clamped < 0 )
                voll_clamped = 0;
            volr_clamped = (u16)seq_right_vol + vol_inc_by;
            if ( volr_clamped >= 128 )
                volr_clamped = 127;
            if ( volr_clamped < 0 )
                volr_clamped = 0;
            _SsVmSetSeqVol(sep_no | (seq_no << 8), voll_clamped, volr_clamped);
            if ( (voll_clamped == 127 && volr_clamped == 127) || (voll_clamped == 0 && volr_clamped == 0) )
            {
                score_struct->m_flags &= ~0x10u;
            }
        }
    }
    else
    {
        score_struct->m_flags &= ~0x10u;
    }
    _SsVmGetSeqVol(sep_no | (seq_no << 8), &score_struct->m_unk5C, &score_struct->m_unk5E);
}