vm_autop.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 SeAutoPan(s16 vc, s16 start_pan, s16 end_pan, s16 delta_time)
{
    libsnd2_spu_voice_t *voice_struct;
 
    voice_struct = &_svm_voice[vc];
    if ( start_pan == end_pan )
        return;
    voice_struct->m_b_auto_pan = 1;
    voice_struct->m_auto_pan_start = start_pan;
    voice_struct->m_auto_pan_end = end_pan;
    if (
        ((start_pan - end_pan >= 0) && (start_pan - end_pan < delta_time))
        || ((start_pan - end_pan < 0) && (end_pan - start_pan < delta_time)) )
    {
        int v8;
 
        if ( end_pan >= start_pan )
        {
            int v12;
            int v13;
 
            v12 = delta_time;
            v13 = start_pan - end_pan;
            if ( v13 == -1 && (unsigned int)v12 == 0x80000000 )
                __builtin_trap();
            voice_struct->m_auto_pan_amount = 1;
            v8 = -(v12 / v13);
        }
        else
        {
            int v9;
 
            v8 = delta_time;
            v9 = start_pan - end_pan;
            if ( v9 == -1 && (unsigned int)v8 == 0x80000000 )
                __builtin_trap();
            v8 = v8 / v9;
            voice_struct->m_auto_pan_amount = -1;
        }
        voice_struct->m_auto_pan_dt1 = v8;
        voice_struct->m_auto_pan_dt2 = v8;
    }
    else
    {
        int v14;
 
        v14 = start_pan - end_pan;
        if ( !delta_time )
            __builtin_trap();
        if ( delta_time == -1 && (unsigned int)v14 == 0x80000000 )
            __builtin_trap();
        voice_struct->m_auto_pan_dt1 = 0;
        voice_struct->m_auto_pan_dt2 = 0;
        voice_struct->m_auto_pan_amount = -(s16)(v14 / delta_time);
    }
}
 
void SetAutoPan(int vc)
{
    int m_auto_pan_dt2;
    int v5;
    int m_auto_pan_amount;
    char m_auto_pan_start;
    const VagAtr *pVag;
    int pan;
    unsigned int v15;
    unsigned int v16;
    unsigned int v18;
    unsigned int v19;
    int mpan;
    libsnd2_spu_voice_t *voice_struct;
 
    voice_struct = &_svm_voice[(s16)vc];
    m_auto_pan_dt2 = (u16)voice_struct->m_auto_pan_dt2;
    voice_struct->m_auto_pan_dt2 = m_auto_pan_dt2 - 1;
    if ( m_auto_pan_dt2 > 0 )
        return;
    v5 = (u16)voice_struct->m_auto_pan_start + (u16)voice_struct->m_auto_pan_amount;
    voice_struct->m_auto_pan_start = v5;
    m_auto_pan_amount = voice_struct->m_auto_pan_amount;
    if ( m_auto_pan_amount <= 0 )
    {
        if ( m_auto_pan_amount < 0 && (s16)v5 <= voice_struct->m_auto_pan_end )
        {
            voice_struct->m_auto_pan_start = voice_struct->m_auto_pan_end;
            voice_struct->m_b_auto_pan = 0;
        }
    }
    else if ( (s16)v5 >= voice_struct->m_auto_pan_end )
    {
        voice_struct->m_auto_pan_start = voice_struct->m_auto_pan_end;
        voice_struct->m_b_auto_pan = 0;
    }
    m_auto_pan_start = voice_struct->m_auto_pan_start;
    if ( _svm_cur.m_voice_idx == (s16)vc )
        _svm_cur.m_unk05 = voice_struct->m_auto_pan_start;
    pVag = &_svm_tn[(u16)voice_struct->m_tone + (voice_struct->m_fake_program * 16)];
    pan = (char)pVag->pan;
    v15 = voice_struct->m_voll2 * 0x3FFF * _svm_vh->mvol / 0x3F01 * _svm_pg[voice_struct->m_prog].mvol * pVag->vol;
    v16 = v15 / 0x3F01;
    if ( pan >= 64 )
    {
        v19 = v15 / 0x3F01;
        v18 = (v16 * (127 - pan)) >> 6;
    }
    else
    {
        unsigned int v17;
 
        v17 = v16 * pan;
        v18 = v15 / 0x3F01;
        v19 = v17 >> 6;
    }
    mpan = (char)_svm_pg[voice_struct->m_prog].mpan;
    if ( mpan >= 64 )
    {
        int v22;
 
        v22 = (u16)v18 * (127 - mpan);
        v18 = (unsigned int)v22 >> 6;
        if ( v22 < 0 )
            v18 = (unsigned int)(v22 + 63) >> 6;
    }
    else
    {
        int v21;
 
        v21 = (u16)v19 * mpan;
        v19 = (unsigned int)v21 >> 6;
        if ( v21 < 0 )
            v19 = (unsigned int)(v21 + 63) >> 6;
    }
    if ( m_auto_pan_start >= 64 )
    {
        int v24;
 
        v24 = (u16)v18 * (127 - m_auto_pan_start);
        v18 = (unsigned int)v24 >> 6;
        if ( v24 < 0 )
            v18 = (unsigned int)(v24 + 63) >> 6;
    }
    else
    {
        int v23;
 
        v23 = (u16)v19 * m_auto_pan_start;
        v19 = (unsigned int)v23 >> 6;
        if ( v23 < 0 )
            v19 = (unsigned int)(v23 + 63) >> 6;
    }
    if ( _svm_stereo_mono == 1 )
    {
        if ( (u16)v18 >= (unsigned int)(u16)v19 )
            v19 = v18;
        else
            v18 = v19;
    }
    voice_struct->m_auto_pan_dt2 = voice_struct->m_auto_pan_dt1;
    _svm_sreg_buf[vc].m_vol_left = v18;
    _svm_sreg_buf[vc].m_vol_right = v19;
    _svm_sreg_dirty[(s16)vc] |= 3;
}