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  1. /***************************************************************************
  2.  
  3.     Philips SAA1099 Sound driver
  4.  
  5.     By Juergen Buchmueller and Manuel Abadia
  6.  
  7.     SAA1099 register layout:
  8.     ========================
  9.  
  10.     offs | 7654 3210 | description
  11.     -----+-----------+---------------------------
  12.     0x00 | ---- xxxx | Amplitude channel 0 (left)
  13.     0x00 | xxxx ---- | Amplitude channel 0 (right)
  14.     0x01 | ---- xxxx | Amplitude channel 1 (left)
  15.     0x01 | xxxx ---- | Amplitude channel 1 (right)
  16.     0x02 | ---- xxxx | Amplitude channel 2 (left)
  17.     0x02 | xxxx ---- | Amplitude channel 2 (right)
  18.     0x03 | ---- xxxx | Amplitude channel 3 (left)
  19.     0x03 | xxxx ---- | Amplitude channel 3 (right)
  20.     0x04 | ---- xxxx | Amplitude channel 4 (left)
  21.     0x04 | xxxx ---- | Amplitude channel 4 (right)
  22.     0x05 | ---- xxxx | Amplitude channel 5 (left)
  23.     0x05 | xxxx ---- | Amplitude channel 5 (right)
  24.          |           |
  25.     0x08 | xxxx xxxx | Frequency channel 0
  26.     0x09 | xxxx xxxx | Frequency channel 1
  27.     0x0a | xxxx xxxx | Frequency channel 2
  28.     0x0b | xxxx xxxx | Frequency channel 3
  29.     0x0c | xxxx xxxx | Frequency channel 4
  30.     0x0d | xxxx xxxx | Frequency channel 5
  31.          |           |
  32.     0x10 | ---- -xxx | Channel 0 octave select
  33.     0x10 | -xxx ---- | Channel 1 octave select
  34.     0x11 | ---- -xxx | Channel 2 octave select
  35.     0x11 | -xxx ---- | Channel 3 octave select
  36.     0x12 | ---- -xxx | Channel 4 octave select
  37.     0x12 | -xxx ---- | Channel 5 octave select
  38.          |           |
  39.     0x14 | ---- ---x | Channel 0 frequency enable (0 = off, 1 = on)
  40.     0x14 | ---- --x- | Channel 1 frequency enable (0 = off, 1 = on)
  41.     0x14 | ---- -x-- | Channel 2 frequency enable (0 = off, 1 = on)
  42.     0x14 | ---- x--- | Channel 3 frequency enable (0 = off, 1 = on)
  43.     0x14 | ---x ---- | Channel 4 frequency enable (0 = off, 1 = on)
  44.     0x14 | --x- ---- | Channel 5 frequency enable (0 = off, 1 = on)
  45.          |           |
  46.     0x15 | ---- ---x | Channel 0 noise enable (0 = off, 1 = on)
  47.     0x15 | ---- --x- | Channel 1 noise enable (0 = off, 1 = on)
  48.     0x15 | ---- -x-- | Channel 2 noise enable (0 = off, 1 = on)
  49.     0x15 | ---- x--- | Channel 3 noise enable (0 = off, 1 = on)
  50.     0x15 | ---x ---- | Channel 4 noise enable (0 = off, 1 = on)
  51.     0x15 | --x- ---- | Channel 5 noise enable (0 = off, 1 = on)
  52.          |           |
  53.     0x16 | ---- --xx | Noise generator parameters 0
  54.     0x16 | --xx ---- | Noise generator parameters 1
  55.          |           |
  56.     0x18 | --xx xxxx | Envelope generator 0 parameters
  57.     0x18 | x--- ---- | Envelope generator 0 control enable (0 = off, 1 = on)
  58.     0x19 | --xx xxxx | Envelope generator 1 parameters
  59.     0x19 | x--- ---- | Envelope generator 1 control enable (0 = off, 1 = on)
  60.          |           |
  61.     0x1c | ---- ---x | All channels enable (0 = off, 1 = on)
  62.     0x1c | ---- --x- | Synch & Reset generators
  63.  
  64. ***************************************************************************/
  65.  
  66. #include "../std.h"
  67. #include "../emul.h"
  68. #include "../vars.h"
  69.  
  70. #include "saa1099.h"
  71.  
  72.  
  73. #define LEFT    0x00
  74. #define RIGHT   0x01
  75.  
  76. static const int amplitude_lookup[16] =
  77. {
  78.      0*32767/16,  1*32767/16,  2*32767/16,  3*32767/16,
  79.      4*32767/16,  5*32767/16,  6*32767/16,  7*32767/16,
  80.      8*32767/16,  9*32767/16, 10*32767/16, 11*32767/16,
  81.     12*32767/16, 13*32767/16, 14*32767/16, 15*32767/16
  82. };
  83.  
  84. static const UINT8 envelope[8][64] =
  85. {
  86.     /* zero amplitude */
  87.     { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  88.       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  89.       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  90.       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  91.     /* maximum amplitude */
  92.     {15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
  93.      15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
  94.      15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
  95.      15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15, },
  96.     /* single decay */
  97.     {15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
  98.       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  99.       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  100.       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  101.     /* repetitive decay */
  102.     {15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
  103.      15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
  104.      15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
  105.      15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 },
  106.     /* single triangular */
  107.     { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
  108.      15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
  109.       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  110.       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  111.     /* repetitive triangular */
  112.     { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
  113.      15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
  114.       0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
  115.      15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 },
  116.     /* single attack */
  117.     { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
  118.       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  119.       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  120.       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  121.     /* repetitive attack */
  122.     { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
  123.       0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
  124.       0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
  125.       0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15 }
  126. };
  127.  
  128. static void saa1099_envelope(saa1099_state *saa, int ch)
  129. {
  130.     if (saa->env_enable[ch])
  131.     {
  132.         int step, mode, mask;
  133.         /* step from 0..63 and then loop in steps 32..63 */
  134.         step = saa->env_step[ch] =
  135.             ((saa->env_step[ch] + 1) & 0x3f) | (saa->env_step[ch] & 0x20);
  136.  
  137.         mode = saa->env_mode[ch];
  138.  
  139.         if(saa->env_upd[ch])
  140.         {
  141.             if(
  142.                ((mode == 1 || mode == 3 || mode == 7) && step && ((step & 0xF) == 0)) // 1, 3, 7
  143.                ||
  144.                ((mode == 5) && step && ((step & 0x1F) == 0)) // 5
  145.                ||
  146.                ((mode == 0 || mode == 2 || mode == 6) && step > 0x0F) // 0, 2, 6
  147.                ||
  148.                ((mode == 4) && step > 0x1F) // 4
  149.               )
  150.             {
  151.                 mode = saa->env_mode[ch] = saa->env_mode_buf[ch];
  152.                 saa->env_reverse_right[ch] = saa->env_reverse_right_buf[ch];
  153.                 saa->env_clock[ch] = saa->env_clock_buf[ch];
  154.  
  155.                 /* reset the envelope */
  156.                 saa->env_step[ch] = 1;
  157.                 step = 1;
  158.                 saa->env_upd[ch] = false;
  159.             }
  160.         }
  161.  
  162.         mask = 15;
  163.         if (saa->env_bits[ch])
  164.             mask &= ~1;     /* 3 bit resolution, mask LSB */
  165.  
  166.         saa->channels[ch*3+2].envelope[ LEFT] = envelope[mode][step] & mask;
  167.         if (saa->env_reverse_right[ch] & 0x01)
  168.         {
  169.             saa->channels[ch*3+2].envelope[RIGHT] = (15 - envelope[mode][step]) & mask;
  170.         }
  171.         else
  172.         {
  173.             saa->channels[ch*3+2].envelope[RIGHT] = envelope[mode][step] & mask;
  174.         }
  175.     }
  176.     else
  177.     {
  178.         /* envelope mode off, set all envelope factors to 16 */
  179.         saa->channels[ch*3+0].envelope[ LEFT] =
  180.         saa->channels[ch*3+1].envelope[ LEFT] =
  181.         saa->channels[ch*3+2].envelope[ LEFT] =
  182.         saa->channels[ch*3+0].envelope[RIGHT] =
  183.         saa->channels[ch*3+1].envelope[RIGHT] =
  184.         saa->channels[ch*3+2].envelope[RIGHT] = 16;
  185.     }
  186. }
  187.  
  188.  
  189. void TSaa1099::update(unsigned TimeStamp)
  190. {
  191.     saa1099_state *saa = this;
  192.     int ch;
  193.  
  194.     /* if the channels are disabled we're done */
  195.     if (!saa->all_ch_enable)
  196.     {
  197.         /* init output data */
  198.         SNDRENDER::update(TimeStamp, 0, 0);
  199.         return;
  200.     }
  201.  
  202.     for (ch = 0; ch < 2; ch++)
  203.     {
  204.         switch (saa->noise_params[ch])
  205.         {
  206.         case 0: saa->noise[ch].freq = 31250.0 * 2; break;
  207.         case 1: saa->noise[ch].freq = 15625.0 * 2; break;
  208.         case 2: saa->noise[ch].freq =  7812.5 * 2; break;
  209.         case 3: saa->noise[ch].freq = saa->channels[ch * 3].freq; break;
  210.         }
  211.     }
  212.  
  213.     /* fill all data needed */
  214.     int output_l = 0, output_r = 0;
  215.  
  216.     /* for each channel */
  217.     for (ch = 0; ch < 6; ch++)
  218.     {
  219.         if (saa->channels[ch].freq == 0.0)
  220.             saa->channels[ch].freq = (double)((2*15625) << saa->channels[ch].octave) /
  221.                 (511.0 - (double)saa->channels[ch].frequency);
  222.  
  223.         /* check the actual position in the square wave */
  224.         saa->channels[ch].counter -= saa->channels[ch].freq;
  225.         while (saa->channels[ch].counter < 0)
  226.         {
  227.             /* calculate new frequency now after the half wave is updated */
  228.             saa->channels[ch].freq = (double)((2*15625) << saa->channels[ch].octave) /
  229.                 (511.0 - (double)saa->channels[ch].frequency);
  230.  
  231.             saa->channels[ch].counter += saa->sample_rate;
  232.             saa->channels[ch].level ^= 1;
  233.  
  234.             /* eventually clock the envelope counters */
  235.             if (ch == 1 && saa->env_clock[0] == 0)
  236.                 saa1099_envelope(saa, 0);
  237.             if (ch == 4 && saa->env_clock[1] == 0)
  238.                 saa1099_envelope(saa, 1);
  239.         }
  240.  
  241.         /* if the noise is enabled */
  242.         if (saa->channels[ch].noise_enable)
  243.         {
  244.             /* if the noise level is high (noise 0: chan 0-2, noise 1: chan 3-5) */
  245.             if (saa->noise[ch/3].level & 1)
  246.             {
  247.                 /* subtract to avoid overflows, also use only half amplitude */
  248.                 output_l -= saa->channels[ch].amplitude[ LEFT] * saa->channels[ch].envelope[ LEFT] / 16 / 2;
  249.                 output_r -= saa->channels[ch].amplitude[RIGHT] * saa->channels[ch].envelope[RIGHT] / 16 / 2;
  250.             }
  251.         }
  252.  
  253.         /* if the square wave is enabled */
  254.         if (saa->channels[ch].freq_enable)
  255.         {
  256.             /* if the channel level is high */
  257.             if (saa->channels[ch].level & 1)
  258.             {
  259.                 output_l += saa->channels[ch].amplitude[ LEFT] * saa->channels[ch].envelope[ LEFT] / 16;
  260.                 output_r += saa->channels[ch].amplitude[RIGHT] * saa->channels[ch].envelope[RIGHT] / 16;
  261.             }
  262.         }
  263.         else if((ch == 2 || ch == 5) && saa->env_enable[ch/3])
  264.         {
  265.             output_l += saa->channels[ch].amplitude[ LEFT] * saa->channels[ch].envelope[ LEFT] / 16;
  266.             output_r += saa->channels[ch].amplitude[RIGHT] * saa->channels[ch].envelope[RIGHT] / 16;
  267.         }
  268.     }
  269.  
  270.     for (ch = 0; ch < 2; ch++)
  271.     {
  272.         /* check the actual position in noise generator */
  273.         saa->noise[ch].counter -= saa->noise[ch].freq;
  274.         while (saa->noise[ch].counter < 0)
  275.         {
  276.             saa->noise[ch].counter += saa->sample_rate;
  277.             if( ((saa->noise[ch].level & 0x4000) == 0) == ((saa->noise[ch].level & 0x0040) == 0) )
  278.                 saa->noise[ch].level = (saa->noise[ch].level << 1) | 1;
  279.             else
  280.                 saa->noise[ch].level <<= 1;
  281.         }
  282.     }
  283.  
  284.     /* write sound data to the buffer */
  285.     unsigned mix_l = unsigned(output_l / 6);
  286.     unsigned mix_r = unsigned(output_r / 6);
  287.     if ((mix_l ^ SNDRENDER::mix_l) | (mix_r ^ SNDRENDER::mix_r)) // similar check inside update()
  288.         SNDRENDER::update(TimeStamp, mix_l, mix_r);
  289. }
  290.  
  291. static const u32 SAM_SAA1099_CLK = 8000000; // Hz
  292.  
  293. TSaa1099::TSaa1099()
  294. {
  295.     saa1099_state *saa = this;
  296.  
  297.     memset(saa, 0, sizeof(saa1099_state));
  298.  
  299.     /* copy global parameters */
  300.     saa1099_state::sample_rate = SAM_SAA1099_CLK / 256; // 31250 Hz
  301.  
  302.     for(unsigned ch = 0; ch < 6; ch++)
  303.     {
  304.         saa->channels[ch].envelope[ LEFT] =
  305.         saa->channels[ch].envelope[RIGHT] = 16;
  306.     }
  307. }
  308.  
  309. void TSaa1099::WrCtl(u8 data)
  310. {
  311.     saa1099_state *saa = this;
  312.  
  313.     saa->selected_reg = data & 0x1f;
  314.     if (saa->selected_reg == 0x18 || saa->selected_reg == 0x19)
  315.     {
  316.         /* clock the envelope channels */
  317.         if (saa->env_clock[0])
  318.             saa1099_envelope(saa,0);
  319.         if (saa->env_clock[1])
  320.             saa1099_envelope(saa,1);
  321.     }
  322. }
  323.  
  324.  
  325. void TSaa1099::WrData(unsigned TimeStamp, u8 data)
  326. {
  327.     saa1099_state *saa = this;
  328.     int reg = saa->selected_reg;
  329.     int ch;
  330.  
  331.     /* first update the stream to this point in time */
  332.    if(TimeStamp)
  333.        flush((TimeStamp * chip_clock_rate) / system_clock_rate);
  334.  
  335.     switch (reg)
  336.     {
  337.     /* channel i amplitude */
  338.     case 0x00:  case 0x01:  case 0x02:  case 0x03:  case 0x04:  case 0x05:
  339.         ch = reg & 7;
  340.         saa->channels[ch].amp[LEFT] = data & 0x0f;
  341.         saa->channels[ch].amp[RIGHT] = (data >> 4) & 0x0f;
  342.  
  343.         saa->channels[ch].amplitude[LEFT] = amplitude_lookup[data & 0x0f];
  344.         saa->channels[ch].amplitude[RIGHT] = amplitude_lookup[(data >> 4) & 0x0f];
  345.  
  346.         if(ch == 0)
  347.         {
  348.             if(saa->env_enable[0])
  349.             {
  350.                 saa->channels[2].amplitude[LEFT] = amplitude_lookup[saa->channels[2].amp[LEFT] & ~1];
  351.                 saa->channels[2].amplitude[RIGHT] = amplitude_lookup[saa->channels[2].amp[RIGHT] & ~1];
  352.             }
  353.             else
  354.             {
  355.                 saa->channels[2].amplitude[LEFT] = amplitude_lookup[saa->channels[2].amp[LEFT]];
  356.                 saa->channels[2].amplitude[RIGHT] = amplitude_lookup[saa->channels[2].amp[RIGHT]];
  357.             }
  358.         }
  359.         else if(ch == 1)
  360.         {
  361.             if(saa->env_enable[1])
  362.             {
  363.                 saa->channels[5].amplitude[LEFT] = amplitude_lookup[saa->channels[5].amp[LEFT] & ~1];
  364.                 saa->channels[5].amplitude[RIGHT] = amplitude_lookup[saa->channels[5].amp[RIGHT] & ~1];
  365.             }
  366.             else
  367.             {
  368.                 saa->channels[5].amplitude[LEFT] = amplitude_lookup[saa->channels[5].amp[LEFT]];
  369.                 saa->channels[5].amplitude[RIGHT] = amplitude_lookup[saa->channels[5].amp[RIGHT]];
  370.             }
  371.         }
  372.         break;
  373.     /* channel i frequency */
  374.     case 0x08:  case 0x09:  case 0x0a:  case 0x0b:  case 0x0c:  case 0x0d:
  375.         ch = reg & 7;
  376.         saa->channels[ch].frequency = data & 0xff;
  377.         break;
  378.     /* channel i octave */
  379.     case 0x10:  case 0x11:  case 0x12:
  380.         ch = (reg - 0x10) << 1;
  381.         saa->channels[ch + 0].octave = data & 0x07;
  382.         saa->channels[ch + 1].octave = (data >> 4) & 0x07;
  383.         break;
  384.     /* channel i frequency enable */
  385.     case 0x14:
  386.         saa->channels[0].freq_enable = data & 0x01;
  387.         saa->channels[1].freq_enable = data & 0x02;
  388.         saa->channels[2].freq_enable = data & 0x04;
  389.         saa->channels[3].freq_enable = data & 0x08;
  390.         saa->channels[4].freq_enable = data & 0x10;
  391.         saa->channels[5].freq_enable = data & 0x20;
  392.         break;
  393.     /* channel i noise enable */
  394.     case 0x15:
  395.         saa->channels[0].noise_enable = data & 0x01;
  396.         saa->channels[1].noise_enable = data & 0x02;
  397.         saa->channels[2].noise_enable = data & 0x04;
  398.         saa->channels[3].noise_enable = data & 0x08;
  399.         saa->channels[4].noise_enable = data & 0x10;
  400.         saa->channels[5].noise_enable = data & 0x20;
  401.         break;
  402.     /* noise generators parameters */
  403.     case 0x16:
  404.         saa->noise_params[0] = data & 0x03;
  405.         saa->noise_params[1] = (data >> 4) & 0x03;
  406.         break;
  407.     /* envelope generators parameters */
  408.     case 0x18:  case 0x19:
  409.         ch = reg - 0x18;
  410.  
  411.         // direct
  412.         saa->env_bits[ch] = data & 0x10;
  413.         saa->env_enable[ch] = data & 0x80;
  414.         if(!(data & 0x80))
  415.             saa->env_step[ch] = 0; // reset envelope
  416.  
  417.         // buffered
  418.         saa->env_reverse_right_buf[ch] = data & 0x01;
  419.         saa->env_mode_buf[ch] = (data >> 1) & 0x07;
  420.         saa->env_clock_buf[ch] = data & 0x20;
  421.         saa->env_upd[ch] = true;
  422.  
  423.  
  424.         if(ch == 0)
  425.         {
  426.             if(saa->env_enable[0])
  427.             {
  428.                 saa->channels[2].amplitude[LEFT] = amplitude_lookup[saa->channels[2].amp[LEFT] & ~1];
  429.                 saa->channels[2].amplitude[RIGHT] = amplitude_lookup[saa->channels[2].amp[RIGHT] & ~1];
  430.             }
  431.             else
  432.             {
  433.                 saa->channels[2].amplitude[LEFT] = amplitude_lookup[saa->channels[2].amp[LEFT]];
  434.                 saa->channels[2].amplitude[RIGHT] = amplitude_lookup[saa->channels[2].amp[RIGHT]];
  435.             }
  436.         }
  437.  
  438.         else if(ch == 1)
  439.         {
  440.             if(saa->env_enable[1])
  441.             {
  442.                 saa->channels[5].amplitude[LEFT] = amplitude_lookup[saa->channels[5].amp[LEFT] & ~1];
  443.                 saa->channels[5].amplitude[RIGHT] = amplitude_lookup[saa->channels[5].amp[RIGHT] & ~1];
  444.             }
  445.             else
  446.             {
  447.                 saa->channels[5].amplitude[LEFT] = amplitude_lookup[saa->channels[5].amp[LEFT]];
  448.                 saa->channels[5].amplitude[RIGHT] = amplitude_lookup[saa->channels[5].amp[RIGHT]];
  449.             }
  450.         }
  451.         break;
  452.     /* channels enable & reset generators */
  453.     case 0x1c:
  454.         saa->all_ch_enable = data & 0x01;
  455.         saa->sync_state = data & 0x02;
  456.         if (data & 0x02)
  457.         {
  458.             int i;
  459.  
  460.             /* Synch & Reset generators */
  461.             for (i = 0; i < 6; i++)
  462.             {
  463.                 saa->channels[i].level = 0;
  464.                 saa->channels[i].counter = 0.0;
  465.             }
  466.         }
  467.         break;
  468.     default:    /* Error! */
  469.         ;
  470.     }
  471. }
  472.  
  473. void TSaa1099::start_frame(bufptr_t dst)
  474. {
  475.     SNDRENDER::start_frame(dst);
  476. }
  477.  
  478. unsigned TSaa1099::end_frame(unsigned clk_ticks)
  479. {
  480.     uint64_t end_chip_tick = ((passed_clk_ticks + clk_ticks) * chip_clock_rate) / system_clock_rate;
  481.  
  482.     flush((unsigned)(end_chip_tick - passed_chip_ticks));
  483.  
  484.     unsigned Val = SNDRENDER::end_frame(t);
  485.  
  486.     passed_clk_ticks += clk_ticks;
  487.     passed_chip_ticks += t;
  488.     t = 0;
  489.  
  490.     return Val;
  491. }
  492.  
  493. void TSaa1099::flush(unsigned chiptick)
  494. {
  495.     while(t < chiptick)
  496.     {
  497.         t++;
  498.         update(t);
  499.     }
  500. }
  501.  
  502. void TSaa1099::set_timings(unsigned system_clock_rate, unsigned chip_clock_rate, unsigned sample_rate)
  503. {
  504.    chip_clock_rate /= 256;
  505.  
  506.    TSaa1099::system_clock_rate = system_clock_rate;
  507.    TSaa1099::chip_clock_rate = chip_clock_rate;
  508.    TSaa1099::saa1099_state::sample_rate = chip_clock_rate;
  509.  
  510.    SNDRENDER::set_timings(chip_clock_rate, sample_rate);
  511.    passed_chip_ticks = passed_clk_ticks = 0;
  512.    t = 0;
  513. }
  514.  
  515. void TSaa1099::reset(unsigned TimeStamp)
  516. {
  517.     WrCtl(0x1C);
  518.     WrData(TimeStamp, 2);
  519. }
  520.  
  521. TSaa1099 Saa1099;
  522.