ssaccele.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 _SsSndSetAccele(s16 sep_no, s16 seq_no, int tempo, int v_time)
{
    libsnd2_sequence_struct_t *score_struct;
    unsigned int m_flags;
 
    score_struct = &_ss_score[sep_no][seq_no];
    m_flags = score_struct->m_flags;
    if ( (m_flags & 1) != 0 && (m_flags & 2) == 0 )
    {
        int m_unk94;
 
        m_unk94 = score_struct->m_unk94;
        if ( tempo != m_unk94 )
        {
            score_struct->m_unkA8 = v_time;
            score_struct->m_unkA4 = v_time;
            score_struct->m_unkAC = tempo;
            if (
                ((tempo - m_unk94 >= 0) && (tempo - m_unk94 < v_time))
                || ((tempo - m_unk94 < 0) && (m_unk94 - tempo < v_time)) )
            {
                int v9;
                int m_unkA8;
                int v11;
                int v13;
 
                v9 = score_struct->m_unk94;
                m_unkA8 = score_struct->m_unkA8;
                v11 = tempo - v9;
                v13 = v9 - tempo;
                if ( v11 < 0 )
                {
                    if ( v13 == -1 && (unsigned int)m_unkA8 == 0x80000000 )
                        __builtin_trap();
                    score_struct->m_unk4E = m_unkA8 / v13;
                }
                else if ( v11 > 0 )
                {
                    score_struct->m_unk4E = m_unkA8 / v11;
                }
                else
                {
                    __builtin_trap();
                }
            }
            else
            {
                int v14;
                int v15;
                int v16;
 
                v14 = score_struct->m_unk94;
                v15 = score_struct->m_unkA8;
                v16 = tempo - v14;
                if ( tempo - v14 < 0 )
                    v16 = v14 - tempo;
                if ( v15 == -1 && (unsigned int)v16 == 0x80000000 )
                    __builtin_trap();
                score_struct->m_unk4E = ~(u16)(v16 / v15);
            }
            score_struct->m_flags |= 0x40u;
            score_struct->m_flags &= ~0x80u;
        }
    }
}
 
void SsSeqSetAccelerando(s16 seq_no, int tempo, int v_time)
{
    _SsSndSetAccele(seq_no, 0, tempo, v_time);
}
 
void SsSepSetAccelerando(s16 seq_no, s16 sep_no, int tempo, int v_time)
{
    _SsSndSetAccele(seq_no, sep_no, tempo, v_time);
}