Added save states; updated application icon.

[thunder] / src / psg.cpp

diff --git a/src/psg.cpp b/src/psg.cpp
index ec849c5d8d1cbed2c1f40587e71c0edcef333817..21ceb90cebcf4dcc6d3990860f8349c405b0123b 100644 (file)
--- a/src/psg.cpp
+++ b/src/psg.cpp
@@ -22,6 +22,7 @@
 #include "psg.h"
 #include <stdio.h>
 #include <string.h>
+#include "fileio.h"
 
 struct Voice
 {
@@ -39,6 +40,18 @@ static uint8_t memory[0x200];
 static uint32_t sampleRate = 44100;
 static uint32_t divisor;
 
+void PSGSaveState(FILE * file)
+{
+       size_t ignored = fwrite(memory, 1, 0x200, file);
+       ignored = fwrite(&voice, 1, sizeof(voice), file);
+}
+
+void PSGLoadState(FILE * file)
+{
+       size_t ignored = fread(memory, 1, 0x200, file);
+       ignored = fread(&voice, 1, sizeof(voice), file);
+}
+
 void InitPSG(uint32_t s/*=44100*/)
 {
        sampleRate = s;
@@ -55,11 +68,6 @@ void InitPSG(uint32_t s/*=44100*/)
 //
 void UpdatePSG(uint8_t * buffer, int count)
 {
-/*
-if F == 44100, then counter++ for each sample.
-if F == 88200, then counter += 2 for each sample.
-if F == 22050, then counter += 0.5 for each sample.
-*/
        // Recast buffer as int16, we're doing 16-bit sound here
        int16_t * p = (int16_t *)buffer;
 
@@ -72,19 +80,10 @@ if F == 22050, then counter += 0.5 for each sample.
 
                        for(int j=0; j<count; j++)
                        {
-//                             uint8_t pos = (voice[i].counter / (sampleRate * 2)) & 0x1F;
-// Where does 60000 come from? IDK. This would probably change depending on
-// the playback rate (currently, 44100). N.B.: 58800 is a hair too high in pitch!
-// 44100 / 60000 = 0.735
-// 192000 / 60000 = 3.2
-//                             uint8_t pos = (voice[i].counter / (60000)) & 0x1F;
-//                             uint8_t pos = (voice[i].counter / (65536)) & 0x1F;
                                uint8_t pos = (voice[i].counter / divisor) & 0x1F;
                                uint8_t sample = ((pos & 0x01) == 0
                                        ? memory[(voice[i].waveform * 16) + (pos / 2)] >> 4
                                        : memory[(voice[i].waveform * 16) + (pos / 2)]) & 0x0F;
-//                             p[j] += (((memory[(voice[i].waveform * 32) + pos] & 0x0F) - 8)
-//                                     * voice[i].leftVolume) << 5;
                                p[j] += ((sample - 8) * voice[i].leftVolume) << 5;
                                voice[i].counter += voice[i].frequency;
                        }
@@ -151,9 +150,6 @@ void WritePSG(uint16_t address, uint8_t data)
                                voice[channel].waveform = data >> 4;
                                voice[channel].frequency = ((data & 0x0F) << 16)
                                        | (voice[channel].frequency & 0x0FFFF);
-#if 0
-printf("PSG: Setting waveform on channel %i to %i...\n", channel, voice[channel].waveform);
-#endif
                                break;
                        case 2:
                                voice[channel].frequency = (data << 8)
@@ -167,32 +163,10 @@ printf("PSG: Setting waveform on channel %i to %i...\n", channel, voice[channel]
                                voice[channel].rightVolume = data & 0x0F;
                                // Noise switch is channel # + 1 (wraps to zero)
                                voice[(channel + 1) & 0x07].noise = (data & 0x80 ? true : false);
-#if 0
-if (voice[(channel + 1) & 0x07].noise)
-{
-       uint8_t ch = (channel + 1) & 0x07;
-       printf("PSG: Setting noise on channel %i, vol=%i, freq=%i...\n", ch, voice[ch].leftVolume, voice[ch].frequency);
-}
-#endif
-#if 0
-if (data & 0x0F)
-{
-       printf("PSG: Setting right volume on channel %i: vol=%i...\n", channel, voice[channel].rightVolume);
-}
-#endif
                                break;
                        }
                }
-
-//             return;
        }
-#if 0
-       else
-               printf("PSG: Write to $%03X of $%02X...\n", address, data);
-#endif
-
-//if (address < 0x100)
-//     printf("PSG: Waveform byte[$%02X] = $%02X...\n", address, data);
 
        memory[address & 0x01FF] = data;
 }