mirror of
https://github.com/mauiaaron/apple2.git
synced 2024-09-27 09:56:08 +00:00
f234de116f
Squashed commit of the following:
REFACTOR : fix comments, logging, and rename some variables
REFACTOR : fix up some commentary, clean deadc0de
REFACTOR : mostly fix all the audio glitches
- amplitudes of samples are gradually shifted to zero when speaker has fallen silent
- simplifies speaker state machine
- fullspeed mode only enqueues quiet samples
REFACTOR : fix up a number of other functions and comments
REFACTOR : clean up code to submit normal speed wave buffer to OpenAL
Move some initializations to the cpu_thread()
REFACTOR : properly reset the speaker cycles access counter so we don't underflow and assert
REFACTOR : should never get a split buffer from our soundcore implementation
Fix warning from gcc ... static array size needs to be computed from integer values
REFACTOR : gcc (but not clang) complains about these, so just make them preprocessor defines
REFACTOR : use unsigned long long because we don't actually care that this counter is 64bit
REFACTOR : remainder_buffer and miscellaneous tweaks
- Adds implementation commentary to document remainder_buffer purpose
- Also adds sample average for square wave boundary in case where remainder_buffer not used (whole-sample boundary)
- Variable renaming and code shuffling
REFACTOR : do not dynamically alloc remainder buffer
- Never attribute to cache-coherancy bugs what is a simple thread race =P
REFACTOR : comments and whitespace
REFACTOR : rename public speaker API functions
REFACTOR : clean up public speaker API
REFACTOR : tabs to spaces
REFACTOR : moar deadc0de clean up and renaming
REFACTOR : remove deadc0de paths from soundcore
REFACTOR : fully excise soundtype stuff now that we only support soundcard output
Move a file static to function scope
REFACTOR : rename more variables and remove deadc0de
REFACTOR : samples_buffer naming and change to explict int16_t
REFACTOR : removed deadc0de and shuffled code locations
REFACTOR : remainder buffer naming and clarify type
REFACTOR : move joystick timing to VM module and remove header visibility
REFACTOR : clarify speaker variable name
REFACTOR : clarify cycle counting codepaths
REFACTOR : VBL/timing interfaces
- eliminates passing around a common global
REFACTOR : names and comments
HACK around volume issue
REFACTOR : rename speaker feedback variable
REFACTOR : rename global total cycle count
REFACTOR : rename a constant
Fix test builds
REFACTOR: rename to is_fullspeed
REFACTOR : local variable naming changes
REFACTOR : migrate cycle timing variables to correct location and remove header visibility
Allow fullspeed codepath to update speaker
REFACTOR : remove deadc0de paths in prep for cleanup
REFACTOR : speaker now manages its own VM entry point
117 lines
3.9 KiB
C
117 lines
3.9 KiB
C
/*
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* Apple // emulator for Linux: Virtual 6502/65C02 interface
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*
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* Copyright 1994 Alexander Jean-Claude Bottema
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* Copyright 1995 Stephen Lee
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* Copyright 1997, 1998 Aaron Culliney
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* Copyright 1998, 1999, 2000 Michael Deutschmann
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*
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* This software package is subject to the GNU General Public License
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* version 2 or later (your choice) as published by the Free Software
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* Foundation.
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*
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* THERE ARE NO WARRANTIES WHATSOEVER.
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*
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*/
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#ifndef __CPU_H_
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#define __CPU_H_
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#if !defined(__ASSEMBLER__)
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#include <sys/types.h>
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#include <stdint.h>
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/* types */
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#define MEM_READ_FLAG (1<<0)
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#define MEM_WRITE_FLAG (1<<1)
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extern uint16_t cpu65_pc; // Program counter
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extern uint8_t cpu65_a; // Accumulator
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extern uint8_t cpu65_f; // Flags (host-order)
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extern uint8_t cpu65_x; // X Index register
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extern uint8_t cpu65_y; // Y Index register
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extern uint8_t cpu65_sp; // Stack Pointer
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extern uint16_t cpu65_ea; // Last effective address
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extern uint8_t cpu65_d; // Last data byte written
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extern uint8_t cpu65_rw; // MEM_READ_FLAG = read occured, MEM_WRITE_FLAG = write
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extern uint8_t cpu65_opcode; // Last opcode
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extern uint8_t cpu65_opcycles; // Last opcode extra cycles
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/* Set up the processor for a new run. Sets up opcode table. */
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extern void cpu65_init();
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/* Interrupt the processor */
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extern void cpu65_interrupt(int reason);
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extern void cpu65_uninterrupt(int reason);
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extern void cpu65_run(void);
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extern void cpu65_reboot(void);
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extern void cpu65_direct_write(int ea,int data);
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extern void *cpu65_vmem_r[65536];
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extern void *cpu65_vmem_w[65536];
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extern unsigned char cpu65_flags_encode[256];
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extern unsigned char cpu65_flags_decode[256];
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extern int16_t cpu65_cycle_count;
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#if CPU_TRACING
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void cpu65_trace_begin(const char *trace_file);
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void cpu65_trace_end(void);
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void cpu65_trace_toggle(const char *trace_file);
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void cpu65_trace_checkpoint(void);
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#endif
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#endif /* !__ASSEMBLER__ */
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#define ResetSig 0x02
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#define IRQ6522 0x08
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#define IRQSpeech 0x10
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#define IRQSSC 0x20
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#define IRQMouse 0x40
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#define IRQGeneric 0x80
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/* Note: These are *not* the bit positions used for the flags in the P
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* register of a real 6502. Rather, they have been distorted so that C,
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* N and Z match the analogous flags in the _80386_ flags register.
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*
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* Additionally, V matches the position of the overflow flag in the high byte
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* of the 80386 register.
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*
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*/
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#define C_Flag 0x1 /* 6502 Carry */
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#define X_Flag 0x2 /* 6502 Xtra */
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#define I_Flag 0x4 /* 6502 Interrupt disable */
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#define V_Flag 0x8 /* 6502 Overflow */
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#define B_Flag 0x10 /* 6502 Break */
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#define D_Flag 0x20 /* 6502 Decimal mode */
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#define Z_Flag 0x40 /* 6502 Zero */
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#define N_Flag 0x80 /* 6502 Neg */
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#define C_Flag_Bit 8 /* 6502 Carry */
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#define X_Flag_Bit 9 /* 6502 Xtra */
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#define I_Flag_Bit 10 /* 6502 Interrupt disable */
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#define V_Flag_Bit 11 /* 6502 Overflow */
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#define B_Flag_Bit 12 /* 6502 Break */
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#define D_Flag_Bit 13 /* 6502 Decimal mode */
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#define Z_Flag_Bit 14 /* 6502 Zero */
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#define N_Flag_Bit 15 /* 6502 Neg */
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/*
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* 6502 flags bit mask
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*/
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#define C_Flag_6502 0x1 // [C]arry
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#define Z_Flag_6502 0x2 // [Z]ero
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#define I_Flag_6502 0x4 // [I]nterrupt
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#define D_Flag_6502 0x8 // [D]ecimal
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#define B_Flag_6502 0x10 // [B]reak
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#define X_Flag_6502 0x20 // [X]tra (reserved)...
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#define V_Flag_6502 0x40 // o[V]erflow
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#define N_Flag_6502 0x80 // [N]egative
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#endif // whole file
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