mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
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589 lines
16 KiB
C
589 lines
16 KiB
C
/****************************************************************************
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* main.c
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*
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* Genesis Plus GX
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*
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* Copyright Eke-Eke (2007-2012), based on original work from Softdev (2006)
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*
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* Redistribution and use of this code or any derivative works are permitted
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* provided that the following conditions are met:
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*
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* - Redistributions may not be sold, nor may they be used in a commercial
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* product or activity.
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*
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* - Redistributions that are modified from the original source must include the
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* complete source code, including the source code for all components used by a
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* binary built from the modified sources. However, as a special exception, the
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* source code distributed need not include anything that is normally distributed
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* (in either source or binary form) with the major components (compiler, kernel,
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* and so on) of the operating system on which the executable runs, unless that
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* component itself accompanies the executable.
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*
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* - Redistributions must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************************/
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#include "shared.h"
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#include "font.h"
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#include "gui.h"
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#include "menu.h"
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#include "history.h"
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#include "file_slot.h"
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#include "file_load.h"
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#include "filesel.h"
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#include "cheats.h"
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#include <fat.h>
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/* audio "exact" samplerate, measured on real hardware */
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#ifdef HW_RVL
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#define SAMPLERATE_48KHZ 48000
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#else
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#define SAMPLERATE_48KHZ 48044
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#endif
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u32 Shutdown = 0;
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u32 ConfigRequested = 1;
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u32 frameticker;
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#ifdef LOG_TIMING
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u64 prevtime;
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u32 frame_cnt;
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u32 delta_time[LOGSIZE];
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u32 delta_samp[LOGSIZE];
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#endif
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#ifdef HW_RVL
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/****************************************************************************
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* Power Button callback
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***************************************************************************/
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static void PowerOff_cb(void)
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{
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Shutdown = 1;
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ConfigRequested = 1;
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}
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#endif
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/****************************************************************************
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* Reset Button callback
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***************************************************************************/
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static void Reset_cb(void)
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{
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if (system_hw & SYSTEM_MD)
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{
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/* Soft Reset */
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gen_reset(0);
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}
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else if (system_hw == SYSTEM_SMS)
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{
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/* assert RESET input (Master System model 1 only) */
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io_reg[0x0D] &= ~IO_RESET_HI;
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}
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}
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/***************************************************************************
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* Genesis Plus Virtual Machine
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*
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***************************************************************************/
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static void init_machine(void)
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{
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/* allocate cartridge ROM here (10 MB) */
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cart.rom = memalign(32, MAXROMSIZE);
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/* mark all BIOS as unloaded */
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config.bios &= 0x03;
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/* Genesis BOOT ROM support (2KB max) */
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memset(boot_rom, 0xFF, 0x800);
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FILE *fp = fopen(MD_BIOS, "rb");
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if (fp != NULL)
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{
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/* read BOOT ROM */
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fread(boot_rom, 1, 0x800, fp);
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fclose(fp);
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/* check BOOT ROM */
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if (!strncmp((char *)(boot_rom + 0x120),"GENESIS OS", 10))
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{
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/* mark Genesis BIOS as loaded */
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config.bios |= SYSTEM_MD;
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}
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}
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/* allocate global work bitmap */
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memset(&bitmap, 0, sizeof (bitmap));
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bitmap.width = 720;
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bitmap.height = 576;
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bitmap.pitch = bitmap.width * 2;
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bitmap.viewport.w = 256;
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bitmap.viewport.h = 224;
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bitmap.viewport.x = 0;
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bitmap.viewport.y = 0;
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bitmap.data = texturemem;
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}
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static void run_emulation(void)
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{
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/* main emulation loop */
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while (1)
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{
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/* emulated system */
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if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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/* Mega Drive type hardware */
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while (!ConfigRequested)
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{
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/* automatic frame skipping (only needed when running Virtua Racing on Gamecube) */
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if (frameticker > 1)
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{
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/* skip frame */
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system_frame_gen(1);
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frameticker = 1;
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}
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else
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{
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/* render frame */
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frameticker = 0;
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system_frame_gen(0);
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/* update video */
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gx_video_Update();
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}
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/* update audio */
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gx_audio_Update();
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/* check interlaced mode change */
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if (bitmap.viewport.changed & 4)
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{
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/* VSYNC "original" mode */
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if (!config.render && (gc_pal == vdp_pal))
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{
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/* framerate has changed, reinitialize audio timings */
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audio_init(SAMPLERATE_48KHZ, get_framerate());
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/* reinitialize sound chips */
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sound_restore();
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}
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/* clear flag */
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bitmap.viewport.changed &= ~4;
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}
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/* wait for next frame */
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while (frameticker < 1) usleep(1);
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}
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}
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else
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{
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/* Master System type hardware */
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while (!ConfigRequested)
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{
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/* render frame (no frameskipping needed) */
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frameticker = 0;
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system_frame_sms(0);
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/* update video */
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gx_video_Update();
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/* update audio */
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gx_audio_Update();
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/* check interlaced mode change */
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if (bitmap.viewport.changed & 4)
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{
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/* "original" mode */
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if (!config.render)
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{
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/* framerate has changed, reinitialize audio timings */
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audio_init(SAMPLERATE_48KHZ, get_framerate());
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/* reinitialize sound chips */
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sound_restore();
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}
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/* clear flag */
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bitmap.viewport.changed &= ~4;
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}
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/* wait for next frame */
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while (frameticker < 1) usleep(1);
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}
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}
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/* stop video & audio */
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gx_audio_Stop();
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gx_video_Stop();
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#ifdef LOG_TIMING
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if (cart.romsize)
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{
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FILE *f;
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char filename[64];
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memset(filename, 0, 64);
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strcpy(filename,"timings-");
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if (!config.vsync || (config.tv_mode == !vdp_pal))
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{
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strcat(filename,"no_");
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}
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else
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{
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if (gc_pal)
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{
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strcat(filename,"50hz_");
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}
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else
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{
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strcat(filename,"60hz_");
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}
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}
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strcat(filename,"vsync-");
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if (vdp_pal)
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{
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strcat(filename,"pal-");
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}
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else
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{
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strcat(filename,"ntsc-");
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}
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if (config.render == 2)
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{
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strcat(filename,"prog.txt");
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}
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else
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{
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if (!config.render && !interlaced)
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{
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strcat(filename,"no_");
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}
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strcat(filename,"int.txt");
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}
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f = fopen(filename,"a");
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if (f != NULL)
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{
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int i;
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u32 min,max;
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double total = 0;
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double nsamples = 0;
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if (delta_time[LOGSIZE - 1] != 0)
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{
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frame_cnt = LOGSIZE;
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}
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min = max = delta_time[0];
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for (i=0; i<frame_cnt; i++)
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{
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fprintf(f,"%d ns - %d samples (%5.8f samples/sec)\n", delta_time[i], delta_samp[i], 1000000000.0*(double)delta_samp[i]/(double)delta_time[i]/4.0);
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total += delta_time[i];
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nsamples += delta_samp[i] / 4.0;
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if (min > delta_time[i]) min = delta_time[i];
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if (max < delta_time[i]) max = delta_time[i];
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}
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fprintf(f,"\n");
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fprintf(f,"min = %d ns\n", min);
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fprintf(f,"max = %d ns\n", max);
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fprintf(f,"avg = %8.5f ns (%5.8f samples/sec, %5.8f samples/frame)\n\n\n", total/(double)i, nsamples/total*1000000000.0, nsamples/(double)i);
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fclose(f);
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}
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}
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memset(delta_time,0,LOGSIZE);
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memset(delta_samp,0,LOGSIZE);
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frame_cnt = prevtime = 0;
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#endif
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/* show menu */
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ConfigRequested = 0;
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mainmenu();
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/* restart video & audio */
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gx_video_Start();
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gx_audio_Start();
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frameticker = 1;
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}
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}
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/*********************************************************************************************************************************************************
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Output exact framerate (used for sound chips emulation -- see sound.c)
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*********************************************************************************************************************************************************/
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double get_framerate(void)
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{
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/* VSYNC is forced OFF or AUTO with TV mode not matching emulated video mode: emulation is synchronized with audio hardware (DMA interrupt) */
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if (!config.vsync || (config.tv_mode == !vdp_pal))
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{
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/* emulator will use original VDP framerate, which (theorically) provides more accurate frequencies but occasional video desynchronization */
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return 0.0;
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}
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/* VSYNC is forced ON or AUTO with TV mode matching emulated video mode: emulation is synchronized with video hardware (VSYNC) */
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/* emulator use exact output framerate for perfect video synchronization and (theorically) no sound skipping */
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if (vdp_pal)
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{
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/* 288p -> 13500000 pixels/sec, 864 pixels/line, 312 lines/field -> fps = 13500000/864/312 = 50.08 hz */
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/* 288i,576i -> 13500000 pixels/sec, 864 pixels/line, 312.5 lines/field (two fields = one frame = 625 lines) -> fps = 13500000/864/312.5 = 50.00 hz */
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return (config.render || interlaced) ? (27000000.0/864.0/625.0) : (13500000.0/864.0/312.0);
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}
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else
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{
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/* 240p -> 13500000 pixels/sec, 858 pixels/line, 263 lines/field -> fps = 13500000/858/263 = 59.83 hz */
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/* 240i,480i -> 13500000 pixels/sec, 858 pixels/line, 262.5 lines/field (two fields = one frame = 525 lines) -> fps = 13500000/858/262.5 = 59.94 hz */
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/* 480p -> 27000000 pixels/sec, 858 pixels/line, 525 lines/field -> fps = 27000000/858/525 = 59.94 hz */
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return (config.render || interlaced) ? (27000000.0/858.0/525.0) : (13500000.0/858.0/263.0);
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}
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}
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/*******************************************
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Restart emulation when loading a new game
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********************************************/
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void reloadrom(void)
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{
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/* Cartridge Hot Swap (make sure system has already been inited once) */
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if (config.hot_swap == 3)
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{
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/* Initialize cartridge hardware only */
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if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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md_cart_init();
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md_cart_reset(1);
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}
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else
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{
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sms_cart_init();
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sms_cart_reset();
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}
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}
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else
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{
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/* Initialize audio emulation */
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/* To prevent any sound skipping, sound chips must run at the exact same speed as the rest of emulation (see sound.c) */
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interlaced = 0;
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audio_init(SAMPLERATE_48KHZ, get_framerate());
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/* Switch virtual system on */
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system_init();
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system_reset();
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/* Allow hot swap */
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config.hot_swap |= 2;
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}
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/* Auto-Load SRAM file */
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if (config.s_auto & 1)
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{
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slot_autoload(0,config.s_device);
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}
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/* Auto-Load State file */
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if (config.s_auto & 2)
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{
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slot_autoload(config.s_default,config.s_device);
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}
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/* Load Cheat file */
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CheatLoad();
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}
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/**************************************************
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Shutdown everything properly
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***************************************************/
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void shutdown(void)
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{
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/* save current config */
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config_save();
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/* save current game state */
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if (config.s_auto & 2)
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{
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slot_autosave(config.s_default,config.s_device);
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}
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/* shutdown emulation */
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system_shutdown();
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audio_shutdown();
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free(cart.rom);
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gx_audio_Shutdown();
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gx_video_Shutdown();
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#ifdef HW_RVL
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DI_Close();
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#endif
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}
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/***************************************************************************
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* M A I N
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*
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***************************************************************************/
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int main (int argc, char *argv[])
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{
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#ifdef HW_RVL
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/* enable 64-byte fetch mode for L2 cache */
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L2Enhance();
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/* initialize DI interface */
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DI_UseCache(0);
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DI_Init();
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#endif
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/* initialize video engine */
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gx_video_Init();
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#ifndef HW_RVL
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/* initialize DVD interface */
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DVD_Init();
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#endif
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/* initialize input engine */
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gx_input_Init();
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/* initialize FAT devices */
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int retry = 0;
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int fatMounted = 0;
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/* try to mount FAT devices during 3 seconds */
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while (!fatMounted && (retry < 12))
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{
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fatMounted = fatInitDefault();
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usleep(250000);
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retry++;
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}
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if (fatMounted)
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{
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/* base directory */
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char pathname[MAXPATHLEN];
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sprintf (pathname, DEFAULT_PATH);
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DIR *dir = opendir(pathname);
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if (dir) closedir(dir);
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else mkdir(pathname,S_IRWXU);
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/* default SRAM & Savestate files directories */
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sprintf (pathname, "%s/saves",DEFAULT_PATH);
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dir = opendir(pathname);
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if (dir) closedir(dir);
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else mkdir(pathname,S_IRWXU);
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sprintf (pathname, "%s/saves/md",DEFAULT_PATH);
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dir = opendir(pathname);
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if (dir) closedir(dir);
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else mkdir(pathname,S_IRWXU);
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sprintf (pathname, "%s/saves/ms",DEFAULT_PATH);
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dir = opendir(pathname);
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if (dir) closedir(dir);
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else mkdir(pathname,S_IRWXU);
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sprintf (pathname, "%s/saves/gg",DEFAULT_PATH);
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dir = opendir(pathname);
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if (dir) closedir(dir);
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else mkdir(pathname,S_IRWXU);
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sprintf (pathname, "%s/saves/sg",DEFAULT_PATH);
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dir = opendir(pathname);
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if (dir) closedir(dir);
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else mkdir(pathname,S_IRWXU);
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/* default Snapshot files directories */
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sprintf (pathname, "%s/snaps",DEFAULT_PATH);
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dir = opendir(pathname);
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if (dir) closedir(dir);
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else mkdir(pathname,S_IRWXU);
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sprintf (pathname, "%s/snaps/md",DEFAULT_PATH);
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dir = opendir(pathname);
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if (dir) closedir(dir);
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else mkdir(pathname,S_IRWXU);
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sprintf (pathname, "%s/snaps/ms",DEFAULT_PATH);
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dir = opendir(pathname);
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if (dir) closedir(dir);
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else mkdir(pathname,S_IRWXU);
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sprintf (pathname, "%s/snaps/gg",DEFAULT_PATH);
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dir = opendir(pathname);
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if (dir) closedir(dir);
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else mkdir(pathname,S_IRWXU);
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sprintf (pathname, "%s/snaps/sg",DEFAULT_PATH);
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dir = opendir(pathname);
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if (dir) closedir(dir);
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else mkdir(pathname,S_IRWXU);
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/* default Cheat files directories */
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sprintf (pathname, "%s/cheats",DEFAULT_PATH);
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dir = opendir(pathname);
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if (dir) closedir(dir);
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else mkdir(pathname,S_IRWXU);
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sprintf (pathname, "%s/cheats/md",DEFAULT_PATH);
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dir = opendir(pathname);
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if (dir) closedir(dir);
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else mkdir(pathname,S_IRWXU);
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sprintf (pathname, "%s/cheats/ms",DEFAULT_PATH);
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dir = opendir(pathname);
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if (dir) closedir(dir);
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else mkdir(pathname,S_IRWXU);
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sprintf (pathname, "%s/cheats/gg",DEFAULT_PATH);
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dir = opendir(pathname);
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if (dir) closedir(dir);
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else mkdir(pathname,S_IRWXU);
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sprintf (pathname, "%s/cheats/sg",DEFAULT_PATH);
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dir = opendir(pathname);
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if (dir) closedir(dir);
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else mkdir(pathname,S_IRWXU);
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}
|
|
|
|
/* initialize sound engine */
|
|
gx_audio_Init();
|
|
|
|
/* initialize genesis plus core */
|
|
config_default();
|
|
history_default();
|
|
init_machine();
|
|
|
|
/* auto-load last ROM file */
|
|
if (config.autoload)
|
|
{
|
|
SILENT = 1;
|
|
if (OpenDirectory(TYPE_RECENT, -1))
|
|
{
|
|
if (LoadFile(0))
|
|
{
|
|
reloadrom();
|
|
gx_video_Start();
|
|
gx_audio_Start();
|
|
frameticker = 1;
|
|
ConfigRequested = 0;
|
|
}
|
|
}
|
|
SILENT = 0;
|
|
}
|
|
|
|
/* show disclaimer */
|
|
if (ConfigRequested)
|
|
{
|
|
legal();
|
|
}
|
|
|
|
#ifdef HW_RVL
|
|
/* power button callback */
|
|
SYS_SetPowerCallback(PowerOff_cb);
|
|
#endif
|
|
|
|
/* reset button callback */
|
|
SYS_SetResetCallback(Reset_cb);
|
|
|
|
/* main emulation loop */
|
|
run_emulation();
|
|
|
|
/* we should never return anyway */
|
|
return 0;
|
|
}
|