Misc. improvements, added WOZ file support to floppy emulation

[apple2] / src / vay8910.h

diff --git a/src/vay8910.h b/src/vay8910.h
new file mode 100644 (file)
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+++ b/src/vay8910.h
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+//
+// Virtual AY-3-8910 Emulator
+//
+// by James Hammons
+// (C) 2018 Underground Software
+//
+
+#ifndef VAY8910_H
+#define VAY8910_H
+
+#include <stdint.h>
+
+struct VAY_3_8910
+{
+       // User visible registers
+       uint16_t period[3];             // Channel A-C period
+       int16_t volume[3];              // Channel A-C volume (non-envelope mode)
+       bool envEnable[3];              // Channel A-C envelope enable
+       bool toneEnable[3];             // Channel A-C tone enable
+       bool noiseEnable[3];    // Channel A-C noise enable
+       uint16_t noisePeriod;   // Noise period (5 bits * 16)
+       uint32_t envPeriod;             // Envelope period (16 bits * 256)
+       bool envAttack;                 // Envelope Attack bit
+       bool envAlternate;              // Envelope Alternate bit
+       bool envHold;                   // Envelope Hold bit
+       // Internal registers
+       uint16_t count[3];              // Channel A-C current count
+       bool state[3];                  // Channel A-C current state
+       uint16_t noiseCount;    // Noise current count
+       bool noiseState;                // Noise state
+       uint32_t envCount[3];   // Envelope current count
+       int16_t envDirection[3];// Envelope direction (rising, 0, or falling)
+       uint32_t prng;                  // Psuedo RNG (17 bits)
+       uint8_t regLatch;               // Register latch (written by 6522VIA)
+       uint8_t data;                   // Data lines (written by 6522VIA)
+       uint8_t id;                             // Chip ID (optional)
+
+       VAY_3_8910();
+       void Reset(void);
+       void WriteControl(uint8_t);
+       void WriteData(uint8_t);
+       void SetRegister(void);
+       uint16_t GetSample(void);
+
+       // Class variables
+
+       // Maximum volume that can be generated by one voice
+       static float maxVolume;
+       // Normalized volumes (zero to one) for AY-3-8910 output, in 16 steps
+       static float normalizedVolume[16];
+};
+
+// Exported variables
+extern bool logAYInternal;
+
+#endif // VAY8910_H
+