tempo.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 _SsSndTempo(s16 sep_no, s16 seq_no)
{
    libsnd2_sequence_struct_t *score_struct;
    int unk_a8_dec;
    int m_unk4E;
    unsigned int calc;
 
    score_struct = &_ss_score[sep_no][seq_no];
    unk_a8_dec = score_struct->m_unkA8 - 1;
    score_struct->m_unkA8 = unk_a8_dec;
    if ( unk_a8_dec < 0 )
    {
        score_struct->m_flags &= ~0x40u;
        score_struct->m_flags &= ~0x80u;
        return;
    }
    m_unk4E = score_struct->m_unk4E;
    if ( m_unk4E < 0 )
    {
        unsigned int m_unk94;
        unsigned int m_unkAC;
        unsigned int v14;
 
        m_unk94 = score_struct->m_unk94;
        m_unkAC = score_struct->m_unkAC;
        v14 = m_unk94 + m_unk4E;
        if ( m_unkAC >= m_unk94 )
        {
            if ( m_unk94 < m_unkAC )
            {
                unsigned int v16;
 
                v16 = m_unk94 - m_unk4E;
                m_unkAC = score_struct->m_unkAC;
                score_struct->m_unk94 = v16;
                if ( m_unkAC < v16 )
                    score_struct->m_unk94 = m_unkAC;
            }
        }
        else
        {
            score_struct->m_unk94 = v14;
            if ( v14 < m_unkAC )
                score_struct->m_unk94 = m_unkAC;
        }
    }
    else if ( m_unk4E > 0 )
    {
        unsigned int v9;
        unsigned int v10;
 
        if ( unk_a8_dec % m_unk4E )
            return;
        v9 = score_struct->m_unk94;
        v10 = score_struct->m_unkAC;
        if ( v10 < v9 )
            score_struct->m_unk94 = v9 - 1;
        else if ( v9 < v10 )
            score_struct->m_unk94 = v9 + 1;
    }
    else
    {
        __builtin_trap();
    }
    calc = 10 * score_struct->m_resolution_of_quarter_note * score_struct->m_unk94 / (unsigned int)(60 * VBLANK_MINUS);
    if ( (60 * VBLANK_MINUS) == 0 )
        __builtin_trap();
    score_struct->m_unk54 = calc;
    if ( (int)calc <= 0 )
        score_struct->m_unk54 = 1;
    if ( !score_struct->m_unkA8 || score_struct->m_unk94 == score_struct->m_unkAC )
    {
        score_struct->m_flags &= ~0x40u;
        score_struct->m_flags &= ~0x80u;
    }
}