/* * GUSEMU32 - API * * Copyright (C) 2000-2007 Tibor "TS" Schütz * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #ifndef GUSEMU_H #define GUSEMU_H /* data types (need to be adjusted if neither a VC6 nor a C99 compatible compiler is used) */ #if defined _WIN32 && defined _MSC_VER /* doesnt support other win32 compilers yet, do it yourself... */ typedef unsigned char GUSbyte; typedef unsigned short GUSword; typedef unsigned int GUSdword; typedef signed char GUSchar; typedef signed short GUSsample; #else #include <stdint.h> typedef int8_t GUSchar; typedef uint8_t GUSbyte; typedef uint16_t GUSword; typedef uint32_t GUSdword; typedef int16_t GUSsample; #endif typedef struct _GUSEmuState { GUSbyte *himemaddr; /* 1024*1024 bytes used for storing uploaded samples (+32 additional bytes for read padding) */ GUSbyte *gusdatapos; /* (gusdataend-gusdata) bytes used for storing emulated GF1/mixer register states (32*32+4 bytes in initial GUSemu32 version) */ int gusirq; int gusdma; unsigned int timer1fraction; unsigned int timer2fraction; void *opaque; } GUSEmuState; /* ** Callback functions needed: */ /* NMI is defined as hwirq=-1 (not supported (yet?)) */ /* GUS_irqrequest returns the number of IRQs actually scheduled into the virtual machine */ /* Level triggered IRQ simulations normally return 1 */ /* Event triggered IRQ simulation can safely ignore GUS_irqclear calls */ int GUS_irqrequest(GUSEmuState *state, int hwirq, int num);/* needed in both mixer and bus emulation functions. */ void GUS_irqclear( GUSEmuState *state, int hwirq); /* used by gus_write() only - can be left empty for mixer functions */ void GUS_dmarequest(GUSEmuState *state); /* used by gus_write() only - can be left empty for mixer functions */ /* ** ISA bus interface functions: */ /* Port I/O handlers */ /* support the following ports: */ /* 2x0,2x6,2x8...2xF,3x0...3x7; */ /* optional: 388,389 (at least writes should be forwarded or some GUS detection algorithms will fail) */ /* data is passed in host byte order */ unsigned int gus_read( GUSEmuState *state, int port, int size); void gus_write(GUSEmuState *state, int port, int size, unsigned int data); /* size is given in bytes (1 for byte, 2 for word) */ /* DMA data transfer function */ /* data pointed to is passed in native x86 order */ void gus_dma_transferdata(GUSEmuState *state, char *dma_addr, unsigned int count, int TC); /* Called back by GUS_start_DMA as soon as the emulated DMA controller is ready for a transfer to or from GUS */ /* (might be immediately if the DMA controller was programmed first) */ /* dma_addr is an already translated address directly pointing to the beginning of the memory block */ /* do not forget to update DMA states after the call, including the DREQ and TC flags */ /* it is possible to break down a single transfer into multiple ones, but take care that: */ /* -dma_count is actually count-1 */ /* -before and during a transfer, DREQ is set and TC cleared */ /* -when calling gus_dma_transferdata(), TC is only set true for call transfering the last byte */ /* -after the last transfer, DREQ is cleared and TC is set */ /* ** GF1 mixer emulation functions: */ /* Usually, gus_irqgen should be called directly after gus_mixvoices if you can meet the recommended ranges. */ /* If the interrupts are executed immediately (i.e., are synchronous), it may be useful to break this */ /* down into a sequence of gus_mixvoice();gus_irqgen(); calls while mixing an audio block. */ /* If the interrupts are asynchronous, it may be needed to use a separate thread mixing into a temporary */ /* audio buffer in order to avoid quality loss caused by large numsamples and elapsed_time values. */ void gus_mixvoices(GUSEmuState *state, unsigned int playback_freq, unsigned int numsamples, GUSsample *bufferpos); /* recommended range: 10 < numsamples < 100 */ /* lower values may result in increased rounding error, higher values often cause audible timing delays */ void gus_irqgen(GUSEmuState *state, unsigned int elapsed_time); /* recommended range: 80us < elapsed_time < max(1000us, numsamples/playback_freq) */ /* lower values won´t provide any benefit at all, higher values can cause audible timing delays */ /* note: masked timers are also calculated by this function, thus it might be needed even without any IRQs in use! */ #endif /* gusemu.h */