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/* |
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* C64_Amiga.h - Put the pieces together, Amiga specific stuff |
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* |
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* Frodo (C) 1994-1997,2002 Christian Bauer |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#include <proto/exec.h> |
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#include <proto/timer.h> |
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|
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|
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// Library bases |
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struct Device *TimerBase; |
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|
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|
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/* |
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* Constructor, system-dependent things |
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*/ |
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|
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void C64::c64_ctor1(void) |
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{ |
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// Open game_io |
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game_port = CreateMsgPort(); |
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game_io = (struct IOStdReq *)CreateIORequest(game_port, sizeof(IOStdReq)); |
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game_io->io_Message.mn_Node.ln_Type = NT_UNKNOWN; |
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game_open = port_allocated = false; |
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if (!OpenDevice("gameport.device", 1, (struct IORequest *)game_io, 0)) |
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game_open = true; |
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} |
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|
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void C64::c64_ctor2(void) |
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{ |
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// Initialize joystick variables |
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joy_state = 0xff; |
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|
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// Open timer_io |
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timer_port = CreateMsgPort(); |
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timer_io = (struct timerequest *)CreateIORequest(timer_port, sizeof(struct timerequest)); |
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OpenDevice(TIMERNAME, UNIT_MICROHZ, (struct IORequest *)timer_io, 0); |
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|
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// Get timer base |
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TimerBase = timer_io->tr_node.io_Device; |
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|
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// Preset speedometer start time |
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GetSysTime(&start_time); |
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} |
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|
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|
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/* |
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* Destructor, system-dependent things |
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*/ |
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|
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void C64::c64_dtor(void) |
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{ |
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// Stop and delete timer_io |
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if (timer_io != NULL) { |
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if (!CheckIO((struct IORequest *)timer_io)) |
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WaitIO((struct IORequest *)timer_io); |
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CloseDevice((struct IORequest *)timer_io); |
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DeleteIORequest((struct IORequest *)timer_io); |
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} |
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|
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if (timer_port != NULL) |
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DeleteMsgPort(timer_port); |
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|
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if (game_open) { |
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if (!CheckIO((struct IORequest *)game_io)) { |
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AbortIO((struct IORequest *)game_io); |
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WaitIO((struct IORequest *)game_io); |
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} |
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CloseDevice((struct IORequest *)game_io); |
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} |
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|
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if (game_io != NULL) |
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DeleteIORequest((struct IORequest *)game_io); |
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|
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if (game_port != NULL) |
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DeleteMsgPort(game_port); |
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} |
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|
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|
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/* |
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* Start emulation |
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*/ |
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|
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void C64::Run(void) |
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{ |
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// Reset chips |
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TheCPU->Reset(); |
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TheSID->Reset(); |
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TheCIA1->Reset(); |
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TheCIA2->Reset(); |
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TheCPU1541->Reset(); |
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|
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// Patch kernal IEC routines |
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orig_kernal_1d84 = Kernal[0x1d84]; |
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orig_kernal_1d85 = Kernal[0x1d85]; |
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PatchKernal(ThePrefs.FastReset, ThePrefs.Emul1541Proc); |
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|
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// Start timer_io |
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timer_io->tr_node.io_Command = TR_ADDREQUEST; |
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timer_io->tr_time.tv_secs = 0; |
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timer_io->tr_time.tv_micro = ThePrefs.SkipFrames * 20000; // 20ms per frame |
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SendIO((struct IORequest *)timer_io); |
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|
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// Start the CPU thread |
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thread_running = true; |
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quit_thyself = false; |
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have_a_break = false; |
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thread_func(); |
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} |
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|
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|
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/* |
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* Stop emulation |
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*/ |
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|
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void C64::Quit(void) |
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{ |
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// Ask the thread to quit itself if it is running |
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if (thread_running) { |
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quit_thyself = true; |
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thread_running = false; |
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} |
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} |
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|
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|
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/* |
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* Pause emulation |
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*/ |
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|
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void C64::Pause(void) |
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{ |
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TheSID->PauseSound(); |
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} |
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|
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|
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/* |
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* Resume emulation |
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*/ |
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|
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void C64::Resume(void) |
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{ |
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TheSID->ResumeSound(); |
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} |
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|
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|
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/* |
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* Vertical blank: Poll keyboard and joysticks, update window |
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*/ |
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|
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void C64::VBlank(bool draw_frame) |
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{ |
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struct timeval end_time; |
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long speed_index; |
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|
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// Poll keyboard |
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TheDisplay->PollKeyboard(TheCIA1->KeyMatrix, TheCIA1->RevMatrix, &joykey); |
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|
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// Poll joysticks |
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TheCIA1->Joystick1 = poll_joystick(0); |
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TheCIA1->Joystick2 = poll_joystick(1); |
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|
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if (ThePrefs.JoystickSwap) { |
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uint8 tmp = TheCIA1->Joystick1; |
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TheCIA1->Joystick1 = TheCIA1->Joystick2; |
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TheCIA1->Joystick2 = tmp; |
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} |
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|
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// Joystick keyboard emulation |
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if (TheDisplay->NumLock()) |
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TheCIA1->Joystick1 &= joykey; |
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else |
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TheCIA1->Joystick2 &= joykey; |
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|
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// Count TOD clocks |
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TheCIA1->CountTOD(); |
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TheCIA2->CountTOD(); |
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|
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// Update window if needed |
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if (draw_frame) { |
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TheDisplay->Update(); |
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|
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// Calculate time between VBlanks, display speedometer |
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GetSysTime(&end_time); |
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SubTime(&end_time, &start_time); |
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speed_index = 20000 * 100 * ThePrefs.SkipFrames / (end_time.tv_micro + 1); |
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|
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// Abort timer_io if speed limiter is off |
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if (!ThePrefs.LimitSpeed) { |
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if (!CheckIO((struct IORequest *)timer_io)) |
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AbortIO((struct IORequest *)timer_io); |
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} else if (speed_index > 100) |
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speed_index = 100; |
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|
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// Wait for timer_io (limit speed) |
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WaitIO((struct IORequest *)timer_io); |
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|
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// Restart timer_io |
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timer_io->tr_node.io_Command = TR_ADDREQUEST; |
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timer_io->tr_time.tv_secs = 0; |
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timer_io->tr_time.tv_micro = ThePrefs.SkipFrames * 20000; // 20ms per frame |
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SendIO((struct IORequest *)timer_io); |
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|
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GetSysTime(&start_time); |
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|
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TheDisplay->Speedometer(speed_index); |
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} |
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} |
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|
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|
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/* |
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* Open/close joystick drivers given old and new state of |
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* joystick preferences |
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*/ |
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|
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void C64::open_close_joysticks(bool oldjoy1, bool oldjoy2, bool newjoy1, bool newjoy2) |
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{ |
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if (game_open && (oldjoy2 != newjoy2)) |
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|
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if (newjoy2) { // Open joystick |
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joy_state = 0xff; |
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port_allocated = false; |
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|
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// Allocate game port |
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BYTE ctype; |
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Forbid(); |
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game_io->io_Command = GPD_ASKCTYPE; |
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game_io->io_Data = &ctype; |
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game_io->io_Length = 1; |
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DoIO((struct IORequest *)game_io); |
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|
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if (ctype != GPCT_NOCONTROLLER) |
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Permit(); |
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else { |
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ctype = GPCT_ABSJOYSTICK; |
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game_io->io_Command = GPD_SETCTYPE; |
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game_io->io_Data = &ctype; |
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game_io->io_Length = 1; |
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DoIO((struct IORequest *)game_io); |
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Permit(); |
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|
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port_allocated = true; |
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|
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// Set trigger conditions |
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game_trigger.gpt_Keys = GPTF_UPKEYS | GPTF_DOWNKEYS; |
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game_trigger.gpt_Timeout = 65535; |
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game_trigger.gpt_XDelta = 1; |
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game_trigger.gpt_YDelta = 1; |
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game_io->io_Command = GPD_SETTRIGGER; |
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game_io->io_Data = &game_trigger; |
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game_io->io_Length = sizeof(struct GamePortTrigger); |
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DoIO((struct IORequest *)game_io); |
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|
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// Flush device buffer |
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game_io->io_Command = CMD_CLEAR; |
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DoIO((struct IORequest *)game_io); |
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|
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// Start reading joystick events |
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game_io->io_Command = GPD_READEVENT; |
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game_io->io_Data = &game_event; |
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game_io->io_Length = sizeof(struct InputEvent); |
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SendIO((struct IORequest *)game_io); |
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} |
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|
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} else { // Close joystick |
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|
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// Abort game_io |
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if (!CheckIO((struct IORequest *)game_io)) { |
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AbortIO((struct IORequest *)game_io); |
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WaitIO((struct IORequest *)game_io); |
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} |
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|
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// Free game port |
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if (port_allocated) { |
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BYTE ctype = GPCT_NOCONTROLLER; |
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game_io->io_Command = GPD_SETCTYPE; |
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game_io->io_Data = &ctype; |
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game_io->io_Length = 1; |
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DoIO((struct IORequest *)game_io); |
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|
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port_allocated = false; |
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} |
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} |
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} |
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|
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|
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/* |
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* Poll joystick port, return CIA mask |
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*/ |
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|
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uint8 C64::poll_joystick(int port) |
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{ |
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if (port == 0) |
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return 0xff; |
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|
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if (game_open && port_allocated) { |
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|
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// Joystick event arrived? |
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while (GetMsg(game_port) != NULL) { |
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|
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// Yes, analyze event |
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switch (game_event.ie_Code) { |
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case IECODE_LBUTTON: // Button pressed |
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joy_state &= 0xef; |
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break; |
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|
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case IECODE_LBUTTON | IECODE_UP_PREFIX: // Button released |
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joy_state |= 0x10; |
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break; |
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|
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case IECODE_NOBUTTON: // Joystick moved |
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if (game_event.ie_X == 1) |
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joy_state &= 0xf7; // Right |
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if (game_event.ie_X == -1) |
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joy_state &= 0xfb; // Left |
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if (game_event.ie_X == 0) |
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joy_state |= 0x0c; |
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if (game_event.ie_Y == 1) |
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joy_state &= 0xfd; // Down |
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if (game_event.ie_Y == -1) |
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joy_state &= 0xfe; // Up |
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if (game_event.ie_Y == 0) |
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joy_state |= 0x03; |
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break; |
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} |
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|
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// Start reading the next event |
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game_io->io_Command = GPD_READEVENT; |
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game_io->io_Data = &game_event; |
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game_io->io_Length = sizeof(struct InputEvent); |
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SendIO((struct IORequest *)game_io); |
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} |
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return joy_state; |
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|
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} else |
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return 0xff; |
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} |
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|
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|
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/* |
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* The emulation's main loop |
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*/ |
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|
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void C64::thread_func(void) |
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{ |
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while (!quit_thyself) { |
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|
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#ifdef FRODO_SC |
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// The order of calls is important here |
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if (TheVIC->EmulateCycle()) |
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TheSID->EmulateLine(); |
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TheCIA1->CheckIRQs(); |
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TheCIA2->CheckIRQs(); |
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TheCIA1->EmulateCycle(); |
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TheCIA2->EmulateCycle(); |
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TheCPU->EmulateCycle(); |
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|
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if (ThePrefs.Emul1541Proc) { |
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TheCPU1541->CountVIATimers(1); |
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if (!TheCPU1541->Idle) |
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TheCPU1541->EmulateCycle(); |
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} |
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CycleCounter++; |
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#else |
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// The order of calls is important here |
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int cycles = TheVIC->EmulateLine(); |
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TheSID->EmulateLine(); |
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#if !PRECISE_CIA_CYCLES |
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TheCIA1->EmulateLine(ThePrefs.CIACycles); |
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TheCIA2->EmulateLine(ThePrefs.CIACycles); |
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#endif |
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|
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if (ThePrefs.Emul1541Proc) { |
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int cycles_1541 = ThePrefs.FloppyCycles; |
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TheCPU1541->CountVIATimers(cycles_1541); |
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|
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if (!TheCPU1541->Idle) { |
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// 1541 processor active, alternately execute |
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// 6502 and 6510 instructions until both have |
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// used up their cycles |
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while (cycles >= 0 || cycles_1541 >= 0) |
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if (cycles > cycles_1541) |
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cycles -= TheCPU->EmulateLine(1); |
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else |
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cycles_1541 -= TheCPU1541->EmulateLine(1); |
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} else |
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TheCPU->EmulateLine(cycles); |
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} else |
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// 1541 processor disabled, only emulate 6510 |
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TheCPU->EmulateLine(cycles); |
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#endif |
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} |
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} |