911 lines
48 KiB
C
911 lines
48 KiB
C
/*
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* Reinette II plus, a french Apple II emulator, using SDL2
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* and powered by puce6502 - a MOS 6502 cpu emulator by the same author
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* Last modified 21st of June 2021
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* Copyright (c) 2020 Arthur Ferreira
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <SDL2/SDL.h>
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#include "puce6502.h"
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// memory layout
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#define RAMSIZE 0xC000
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#define ROMSTART 0xD000
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#define ROMSIZE 0x3000
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uint8_t ram[RAMSIZE]; // 48K of ram in $000-$BFFF
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uint8_t rom[ROMSIZE]; // 12K of rom in $D000-$FFFF
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// language card
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#define LGCSTART 0xD000
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#define LGCSIZE 0x3000
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#define BK2START 0xD000
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#define BK2SIZE 0x1000
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uint8_t lgc[LGCSIZE]; // Language Card 12K in $D000-$FFFF
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uint8_t bk2[BK2SIZE]; // bank 2 of Language Card 4K in $D000-$DFFF
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// disk ][ prom
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#define SL6START 0xC600
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#define SL6SIZE 0x0100
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uint8_t sl6[SL6SIZE]; // P5A disk ][ prom in slot 6
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//================================================================ SOFT SWITCHES
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uint8_t KBD = 0; // $C000, $C010 ascii value of keyboard input
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bool TEXT = true; // $C050 CLRTEXT / $C051 SETTEXT
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bool MIXED = false; // $C052 CLRMIXED / $C053 SETMIXED
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bool PAGE2 = false; // $C054 PAGE2 off / $C055 PAGE2 on
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bool HIRES = false; // $C056 GR / $C057 HGR
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bool LCWR = true; // Language Card writable
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bool LCRD = false; // Language Card readable
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bool LCBK2 = true; // Language Card bank 2 enabled
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bool LCWFF = false; // Language Card pre-write flip flop
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//====================================================================== PADDLES
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uint8_t PB0 = 0; // $C061 Push Button 0 (bit 7) / Open Apple
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uint8_t PB1 = 0; // $C062 Push Button 1 (bit 7) / Solid Apple
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uint8_t PB2 = 0; // $C063 Push Button 2 (bit 7) / shift mod !!!
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float GCP[2] = { 127.0f, 127.0f }; // GC Position ranging from 0 (left) to 255 right
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float GCC[2] = { 0.0f }; // $C064 (GC0) and $C065 (GC1) Countdowns
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int GCD[2] = { 0 }; // GC0 and GC1 Directions (left/down or right/up)
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int GCA[2] = { 0 }; // GC0 and GC1 Action (push or release)
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uint8_t GCActionSpeed = 8; // Game Controller speed at which it goes to the edges
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uint8_t GCReleaseSpeed = 8; // Game Controller speed at which it returns to center
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long long int GCCrigger; // $C070 the tick at which the GCs were reseted
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inline static void resetPaddles() {
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GCC[0] = GCP[0] * GCP[0]; // initialize the countdown for both paddles
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GCC[1] = GCP[1] * GCP[1]; // to the square of their actuall values (positions)
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GCCrigger = ticks; // records the time this was done
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}
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inline static uint8_t readPaddle(int pdl) {
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const float GCFreq = 6.6; // the speed at which the GC values decrease
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GCC[pdl] -= (ticks - GCCrigger) / GCFreq; // decreases the countdown
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if (GCC[pdl] <= 0) // timeout
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return GCC[pdl] = 0; // returns 0
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return 0x80; // not timeout, return something with the MSB set
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}
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//====================================================================== SPEAKER
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#define audioBufferSize 4096 // found to be large enought
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Sint8 audioBuffer[2][audioBufferSize] = { 0 }; // see in main() for more details
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SDL_AudioDeviceID audioDevice;
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bool muted = false; // mute/unmute switch
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static void playSound() {
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static long long int lastTick = 0LL;
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static bool SPKR = false; // $C030 Speaker toggle
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if (!muted) {
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SPKR = !SPKR; // toggle speaker state
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Uint32 length = (int)((double)(ticks - lastTick) / 10.65625f); // 1023000Hz / 96000Hz = 10.65625
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lastTick = ticks;
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if (length > audioBufferSize) length = audioBufferSize;
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SDL_QueueAudio(audioDevice, audioBuffer[SPKR], length | 1); // | 1 TO HEAR HIGH FREQ SOUNDS
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}
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}
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//====================================================================== DISK ][
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int curDrv = 0; // Current Drive - only one can be enabled at a time
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struct drive {
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char filename[400]; // the full disk image pathname
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bool readOnly; // based on the image file attributes
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uint8_t data[232960]; // nibblelized disk image
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bool motorOn; // motor status
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bool writeMode; // writes to file are not implemented
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uint8_t track; // current track position
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uint16_t nibble; // ptr to nibble under head position
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} disk[2] = { 0 }; // two disk ][ drive units
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int insertFloppy(SDL_Window *wdo, char *filename, int drv) {
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FILE *f = fopen(filename, "rb"); // open file in read binary mode
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if (!f || fread(disk[drv].data, 1, 232960, f) != 232960) // load it into memory and check size
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return 0;
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fclose(f);
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sprintf(disk[drv].filename, "%s", filename); // update disk filename record
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f = fopen(filename, "ab"); // try to open the file in append binary mode
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if (f) { // success, file is writable
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disk[drv].readOnly = false; // update the readOnly flag
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fclose(f); // and close it untouched
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} else {
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disk[drv].readOnly = true; // f is NULL, no writable, no need to close it
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}
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char title[1000]; // UPDATE WINDOW TITLE
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int i, a, b;
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i = a = 0;
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while (disk[0].filename[i] != 0) // find start of filename for disk0
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if (disk[0].filename[i++] == '\\') a = i;
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i = b = 0;
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while (disk[1].filename[i] != 0) // find start of filename for disk1
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if (disk[1].filename[i++] == '\\') b = i;
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sprintf(title, "Reinette ][+ D1: %s D2: %s", disk[0].filename + a, disk[1].filename + b);
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SDL_SetWindowTitle(wdo, title); // updates window title
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return 1;
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}
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int saveFloppy(int drive) {
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if (!disk[drive].filename[0]) return 0; // no file loaded into drive
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if (disk[drive].readOnly) return 0; // file is read only write no aptempted
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FILE *f = fopen(disk[drive].filename, "wb");
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if (!f) return 0; // could not open the file in write overide binary
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if (fwrite(disk[drive].data, 1, 232960, f) != 232960) { // failed to write the full file (disk full ?)
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fclose(f); // release the ressource
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return 0;
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}
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fclose(f); // success, release the ressource
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return 1;
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}
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void stepMotor(uint16_t address) {
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static bool phases[2][4] = { 0 }; // phases states (for both drives)
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static bool phasesB[2][4] = { 0 }; // phases states Before
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static bool phasesBB[2][4] = { 0 }; // phases states Before Before
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static int pIdx[2] = { 0 }; // phase index (for both drives)
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static int pIdxB[2] = { 0 }; // phase index Before
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static int halfTrackPos[2] = { 0 };
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address &= 7;
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int phase = address >> 1;
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phasesBB[curDrv][pIdxB[curDrv]] = phasesB[curDrv][pIdxB[curDrv]];
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phasesB[curDrv][pIdx[curDrv]] = phases[curDrv][pIdx[curDrv]];
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pIdxB[curDrv] = pIdx[curDrv];
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pIdx[curDrv] = phase;
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if (!(address & 1)) { // head not moving (PHASE x OFF)
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phases[curDrv][phase] = false;
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return;
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}
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if ((phasesBB[curDrv][(phase + 1) & 3]) && (--halfTrackPos[curDrv] < 0)) // head is moving in
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halfTrackPos[curDrv] = 0;
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if ((phasesBB[curDrv][(phase - 1) & 3]) && (++halfTrackPos[curDrv] > 140)) // head is moving out
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halfTrackPos[curDrv] = 140;
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phases[curDrv][phase] = true; // update track#
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disk[curDrv].track = (halfTrackPos[curDrv] + 1) / 2;
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}
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inline void setDrv(int drv) {
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disk[drv].motorOn = disk[!drv].motorOn || disk[drv].motorOn; // if any of the motors were ON
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disk[!drv].motorOn = false; // motor of the other drive is set to OFF
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curDrv = drv; // set the current drive
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}
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//========================================== MEMORY MAPPED SOFT SWITCHES HANDLER
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// this function is called from readMem and writeMem
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// it complements both functions when address is in page $C0
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uint8_t softSwitches(uint16_t address, uint8_t value, bool WRT) {
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static uint8_t dLatch = 0; // disk ][ I/O register
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switch (address) {
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case 0xC000: return KBD; // KEYBOARD
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case 0xC010: KBD &= 0x7F; return KBD; // KBDSTROBE
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case 0xC020: // TAPEOUT (shall we listen it ? - try SAVE from applesoft)
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case 0xC030: // SPEAKER
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case 0xC033: playSound(); break; // apple invader uses $C033 to output sound !
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case 0xC050: TEXT = false; break; // Graphics
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case 0xC051: TEXT = true; break; // Text
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case 0xC052: MIXED = false; break; // Mixed off
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case 0xC053: MIXED = true; break; // Mixed on
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case 0xC054: PAGE2 = false; break; // PAGE2 off
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case 0xC055: PAGE2 = true; break; // PAGE2 on
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case 0xC056: HIRES = false; break; // HiRes off
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case 0xC057: HIRES = true; break; // HiRes on
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case 0xC061: return PB0; // Push Button 0
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case 0xC062: return PB1; // Push Button 1
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case 0xC063: return PB2; // Push Button 2
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case 0xC064: return readPaddle(0); // Paddle 0
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case 0xC065: return readPaddle(1); // Paddle 1
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case 0xC070: resetPaddles(); break; // paddle timer RST
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case 0xC080: // LANGUAGE CARD :
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case 0xC084: LCBK2 = 1; LCRD = 1; LCWR = 0; LCWFF = 0; break; // LC2RD
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case 0xC081:
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case 0xC085: LCBK2 = 1; LCRD = 0; LCWR |= LCWFF; LCWFF = !WRT; break; // LC2WR
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case 0xC082:
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case 0xC086: LCBK2 = 1; LCRD = 0; LCWR = 0; LCWFF = 0; break; // ROMONLY2
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case 0xC083:
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case 0xC087: LCBK2 = 1; LCRD = 1; LCWR |= LCWFF; LCWFF = !WRT; break; // LC2RW
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case 0xC088:
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case 0xC08C: LCBK2 = 0; LCRD = 1; LCWR = 0; LCWFF = 0; break; // LC1RD
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case 0xC089:
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case 0xC08D: LCBK2 = 0; LCRD = 0; LCWR |= LCWFF; LCWFF = !WRT; break; // LC1WR
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case 0xC08A:
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case 0xC08E: LCBK2 = 0; LCRD = 0; LCWR = 0; LCWFF = 0; break; // ROMONLY1
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case 0xC08B:
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case 0xC08F: LCBK2 = 0; LCRD = 1; LCWR |= LCWFF; LCWFF = !WRT; break; // LC1RW
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case 0xC0E0:
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case 0xC0E1:
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case 0xC0E2:
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case 0xC0E3:
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case 0xC0E4:
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case 0xC0E5:
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case 0xC0E6:
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case 0xC0E7: stepMotor(address); break; // MOVE DRIVE HEAD
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case 0xCFFF:
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case 0xC0E8: disk[curDrv].motorOn = false; break; // MOTOROFF
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case 0xC0E9: disk[curDrv].motorOn = true; break; // MOTORON
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case 0xC0EA: setDrv(0); break; // DRIVE0EN
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case 0xC0EB: setDrv(1); break; // DRIVE1EN
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case 0xC0EC: // Shift Data Latch
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if (disk[curDrv].writeMode) // writting
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disk[curDrv].data[disk[curDrv].track*0x1A00+disk[curDrv].nibble]=dLatch;// good luck gcc
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else // reading
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dLatch=disk[curDrv].data[disk[curDrv].track*0x1A00+disk[curDrv].nibble];// easy peasy
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disk[curDrv].nibble = (disk[curDrv].nibble + 1) % 0x1A00; // turn floppy of 1 nibble
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return dLatch;
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case 0xC0ED: dLatch = value; break; // Load Data Latch
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case 0xC0EE: // latch for READ
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disk[curDrv].writeMode = false;
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return disk[curDrv].readOnly ? 0x80 : 0; // check protection
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case 0xC0EF: disk[curDrv].writeMode = true; break; // latch for WRITE
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}
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return ticks % 0xFF; // catch all, gives a 'floating' value
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}
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//======================================================================= MEMORY
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// these two functions are imported into puce6502.c
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uint8_t readMem(uint16_t address) {
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if (address < RAMSIZE)
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return ram[address]; // RAM
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if (address >= ROMSTART) {
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if (!LCRD)
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return rom[address - ROMSTART]; // ROM
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if (LCBK2 && (address < 0xE000))
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return bk2[address - BK2START]; // BK2
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return lgc[address - LGCSTART]; // LC
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}
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if ((address & 0xFF00) == SL6START)
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return sl6[address - SL6START]; // disk][
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if ((address & 0xF000) == 0xC000)
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return softSwitches(address, 0, false); // Soft Switches
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return ticks & 0xFF; // catch all, gives a 'floating' value
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}
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void writeMem(uint16_t address, uint8_t value) {
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if (address < RAMSIZE) {
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ram[address] = value; // RAM
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return;
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}
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if (LCWR && (address >= ROMSTART)) {
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if (LCBK2 && (address < 0xE000)) {
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bk2[address - BK2START] = value; // BK2
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return;
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}
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lgc[address - LGCSTART] = value; // LC
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return;
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}
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if ((address & 0xF000) == 0xC000) {
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softSwitches(address, value, true); // Soft Switches
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return;
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}
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}
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//========================================================== PROGRAM ENTRY POINT
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int main(int argc, char *argv[]) {
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//========================================================= SDL INITIALIZATION
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int zoom = 2;
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uint8_t tries = 0; // for disk ][ speed-up access
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SDL_Event event;
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SDL_bool running = true, paused = false, ctrl = false, shift = false, alt = false;
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if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0) {
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printf("failed to initialize SDL2 : %s", SDL_GetError());
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return -1;
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}
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SDL_Window *wdo = SDL_CreateWindow("Reinette ][+", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 280 * zoom, 192 * zoom, SDL_WINDOW_OPENGL);
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SDL_Renderer *rdr = SDL_CreateRenderer(wdo, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
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SDL_SetRenderDrawBlendMode(rdr, SDL_BLENDMODE_NONE); // SDL_BLENDMODE_BLEND);
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SDL_EventState(SDL_DROPFILE, SDL_ENABLE); // ask SDL2 to read dropfile events
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SDL_RenderSetScale(rdr, zoom, zoom);
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SDL_Surface *sshot; // used later for the screenshots
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//=================================================== SDL AUDIO INITIALIZATION
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SDL_AudioSpec desired = { 96000, AUDIO_S8, 1, 0, 4096, 0, 0, NULL, NULL };
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audioDevice = SDL_OpenAudioDevice(NULL, 0, &desired, NULL, SDL_FALSE); // get the audio device ID
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SDL_PauseAudioDevice(audioDevice, muted); // unmute it (muted is false)
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uint8_t volume = 4;
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for (int i = 0; i < audioBufferSize; i++) { // two audio buffers,
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audioBuffer[true][i] = volume; // one used when SPKR is true
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audioBuffer[false][i] = -volume; // the other when SPKR is false
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}
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//===================================== VARIABLES USED IN THE VIDEO PRODUCTION
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int TextCache[24][40] = { 0 };
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int LoResCache[24][40] = { 0 };
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int HiResCache[192][40] = { 0 }; // check which Hi-Res 7 dots needs redraw
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uint8_t previousBit[192][40] = { 0 }; // the last bit value of the byte before.
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enum characterAttribute { A_NORMAL, A_INVERSE, A_FLASH } glyphAttr; // character attribute in TEXT
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uint8_t flashCycle = 0; // TEXT cursor flashes at 2Hz
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SDL_Rect drvRect[2] = { { 272, 188, 4, 4 }, { 276, 188, 4, 4 } }; // disk drive status squares
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SDL_Rect pixelGR = { 0, 0, 7, 4 }; // a block in LoRes
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SDL_Rect dstRect = { 0, 0, 7, 8 }; // the dst character in rdr
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SDL_Rect charRects[128]; // the src from the norm and rev textures
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for (int c = 0; c < 128; c++) { // index of the array = ascii code
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charRects[c].x = 7 * c;
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charRects[c].y = 0;
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charRects[c].w = 7;
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charRects[c].h = 8;
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}
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const int color[16][3] = { // the 16 low res colors
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{ 0, 0, 0 }, { 226, 57, 86 }, { 28, 116, 205 }, { 126, 110, 173 },
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{ 31, 129, 128 }, { 137, 130, 122 }, { 86, 168, 228 }, { 144, 178, 223 },
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{ 151, 88, 34 }, { 234, 108, 21 }, { 158, 151, 143 }, { 255, 206, 240 },
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{ 144, 192, 49 }, { 255, 253, 166 }, { 159, 210, 213 }, { 255, 255, 255 }
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};
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const int hcolor[16][3] = { // the high res colors (2 light levels)
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{ 0, 0, 0 }, { 144, 192, 49 }, { 126, 110, 173 }, { 255, 255, 255 },
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{ 0, 0, 0 }, { 234, 108, 21 }, { 86, 168, 228 }, { 255, 255, 255 },
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{ 0, 0, 0 }, { 63, 55, 86 }, { 72, 96, 25 }, { 255, 255, 255 },
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{ 0, 0, 0 }, { 43, 84, 114 }, { 117, 54, 10 }, { 255, 255, 255 }
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};
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const int offsetGR[24] = { // helper for TEXT and GR video generation
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0x0000, 0x0080, 0x0100, 0x0180, 0x0200, 0x0280, 0x0300, 0x0380, // lines 0-7
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0x0028, 0x00A8, 0x0128, 0x01A8, 0x0228, 0x02A8, 0x0328, 0x03A8, // lines 8-15
|
|
0x0050, 0x00D0, 0x0150, 0x01D0, 0x0250, 0x02D0, 0x0350, 0x03D0 // lines 16-23
|
|
};
|
|
|
|
const int offsetHGR[192] = { // helper for HGR video generation
|
|
0x0000, 0x0400, 0x0800, 0x0C00, 0x1000, 0x1400, 0x1800, 0x1C00, // lines 0-7
|
|
0x0080, 0x0480, 0x0880, 0x0C80, 0x1080, 0x1480, 0x1880, 0x1C80, // lines 8-15
|
|
0x0100, 0x0500, 0x0900, 0x0D00, 0x1100, 0x1500, 0x1900, 0x1D00, // lines 16-23
|
|
0x0180, 0x0580, 0x0980, 0x0D80, 0x1180, 0x1580, 0x1980, 0x1D80,
|
|
0x0200, 0x0600, 0x0A00, 0x0E00, 0x1200, 0x1600, 0x1A00, 0x1E00,
|
|
0x0280, 0x0680, 0x0A80, 0x0E80, 0x1280, 0x1680, 0x1A80, 0x1E80,
|
|
0x0300, 0x0700, 0x0B00, 0x0F00, 0x1300, 0x1700, 0x1B00, 0x1F00,
|
|
0x0380, 0x0780, 0x0B80, 0x0F80, 0x1380, 0x1780, 0x1B80, 0x1F80,
|
|
0x0028, 0x0428, 0x0828, 0x0C28, 0x1028, 0x1428, 0x1828, 0x1C28,
|
|
0x00A8, 0x04A8, 0x08A8, 0x0CA8, 0x10A8, 0x14A8, 0x18A8, 0x1CA8,
|
|
0x0128, 0x0528, 0x0928, 0x0D28, 0x1128, 0x1528, 0x1928, 0x1D28,
|
|
0x01A8, 0x05A8, 0x09A8, 0x0DA8, 0x11A8, 0x15A8, 0x19A8, 0x1DA8,
|
|
0x0228, 0x0628, 0x0A28, 0x0E28, 0x1228, 0x1628, 0x1A28, 0x1E28,
|
|
0x02A8, 0x06A8, 0x0AA8, 0x0EA8, 0x12A8, 0x16A8, 0x1AA8, 0x1EA8,
|
|
0x0328, 0x0728, 0x0B28, 0x0F28, 0x1328, 0x1728, 0x1B28, 0x1F28,
|
|
0x03A8, 0x07A8, 0x0BA8, 0x0FA8, 0x13A8, 0x17A8, 0x1BA8, 0x1FA8,
|
|
0x0050, 0x0450, 0x0850, 0x0C50, 0x1050, 0x1450, 0x1850, 0x1C50,
|
|
0x00D0, 0x04D0, 0x08D0, 0x0CD0, 0x10D0, 0x14D0, 0x18D0, 0x1CD0,
|
|
0x0150, 0x0550, 0x0950, 0x0D50, 0x1150, 0x1550, 0x1950, 0x1D50,
|
|
0x01D0, 0x05D0, 0x09D0, 0x0DD0, 0x11D0, 0x15D0, 0x19D0, 0x1DD0,
|
|
0x0250, 0x0650, 0x0A50, 0x0E50, 0x1250, 0x1650, 0x1A50, 0x1E50,
|
|
0x02D0, 0x06D0, 0x0AD0, 0x0ED0, 0x12D0, 0x16D0, 0x1AD0, 0x1ED0, // lines 168-183
|
|
0x0350, 0x0750, 0x0B50, 0x0F50, 0x1350, 0x1750, 0x1B50, 0x1F50, // lines 176-183
|
|
0x03D0, 0x07D0, 0x0BD0, 0x0FD0, 0x13D0, 0x17D0, 0x1BD0, 0x1FD0 // lines 184-191
|
|
};
|
|
|
|
|
|
//================================= LOAD NORMAL AND REVERSE CHARACTERS BITMAPS
|
|
|
|
char workDir[1000]; // find the working directory
|
|
int workDirSize = 0, i = 0;
|
|
while (argv[0][i] != '\0') {
|
|
workDir[i] = argv[0][i];
|
|
if (argv[0][++i] == '\\') workDirSize = i + 1; // find the last '/' if any
|
|
}
|
|
|
|
SDL_Surface *tmpSurface;
|
|
workDir[workDirSize] = 0;
|
|
tmpSurface = SDL_LoadBMP(strncat(workDir, "assets/font-normal.bmp", 23)); // load the normal font
|
|
SDL_Texture *normCharTexture = SDL_CreateTextureFromSurface(rdr, tmpSurface);
|
|
SDL_FreeSurface(tmpSurface);
|
|
|
|
workDir[workDirSize] = 0;
|
|
tmpSurface = SDL_LoadBMP(strncat(workDir, "assets/font-reverse.bmp", 24)); // load the reverse font
|
|
SDL_Texture *revCharTexture = SDL_CreateTextureFromSurface(rdr, tmpSurface);
|
|
SDL_FreeSurface(tmpSurface);
|
|
|
|
|
|
//================================================================== LOAD ROMS
|
|
|
|
workDir[workDirSize] = 0;
|
|
FILE *f = fopen(strncat(workDir, "rom/appleII+.rom", 17), "rb"); // load the Apple II+ ROM
|
|
if (!f) {
|
|
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Fatal error", "Could not locate appleII+.rom in the rom folder", NULL);
|
|
return 1; // exit
|
|
}
|
|
if (fread(rom, 1, ROMSIZE, f) != ROMSIZE) { // the file is too small
|
|
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Fatal error", "appleII+.rom should be exactly 12 KB", NULL);
|
|
return 1; // exit
|
|
}
|
|
fclose(f);
|
|
|
|
workDir[workDirSize] = 0;
|
|
f = fopen(strncat(workDir, "rom/diskII.rom", 15), "rb"); // load the P5A disk ][ PROM
|
|
if (!f) {
|
|
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Fatal error", "Could not locate diskII.rom in the rom folder", NULL);
|
|
return 1; // exit
|
|
}
|
|
if (fread(sl6, 1, 256, f) != 256) { // file too small
|
|
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Fatal error", "diskII.rom should be exactly 256 bytes", NULL);
|
|
return 1; // exit
|
|
}
|
|
fclose(f);
|
|
|
|
|
|
//========================================================== VM INITIALIZATION
|
|
|
|
if (argc > 1) insertFloppy(wdo, argv[1], 0); // load floppy if provided at command line
|
|
|
|
// reset the CPU
|
|
puce6502RST(); // reset the 6502
|
|
|
|
// dirty hack, fix soon... if I understand why
|
|
ram[0x4D] = 0xAA; // Joust crashes if this memory location equals zero
|
|
ram[0xD0] = 0xAA; // Planetoids won't work if this memory location equals zero
|
|
|
|
|
|
//================================================================== MAIN LOOP
|
|
|
|
while (running) {
|
|
|
|
if (!paused) { // the apple II is clocked at 1023000.0 Hhz
|
|
puce6502Exec(17050); // execute instructions for 1/60 of a second
|
|
while (disk[curDrv].motorOn && ++tries) // until motor is off or i reaches 255+1=0
|
|
puce6502Exec(5000); // speed up drive access artificially
|
|
}
|
|
|
|
|
|
//=============================================================== USER INPUT
|
|
|
|
while (SDL_PollEvent(&event)) {
|
|
alt = SDL_GetModState() & KMOD_ALT ? true : false;
|
|
ctrl = SDL_GetModState() & KMOD_CTRL ? true : false;
|
|
shift = SDL_GetModState() & KMOD_SHIFT ? true : false;
|
|
PB0 = alt ? 0xFF : 0x00; // update push button 0
|
|
PB1 = ctrl ? 0xFF : 0x00; // update push button 1
|
|
PB2 = shift ? 0xFF : 0x00; // update push button 2
|
|
|
|
if (event.type == SDL_QUIT) running = false; // WM sent TERM signal
|
|
|
|
// if (event.type == SDL_WINDOWEVENT) { // pause if the window loses focus
|
|
// if (event.window.event == SDL_WINDOWEVENT_FOCUS_LOST)
|
|
// paused = true;
|
|
// else if (event.window.event == SDL_WINDOWEVENT_FOCUS_GAINED)
|
|
// paused = false;
|
|
// }
|
|
|
|
if (event.type == SDL_DROPFILE) { // user dropped a file
|
|
char *filename = event.drop.file; // get full pathname
|
|
if (!insertFloppy(wdo, filename, alt)) // if ALT is pressed : drv 1 else drv 0
|
|
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Load", "Not a valid nib file", NULL);
|
|
SDL_free(filename); // free filename memory
|
|
paused = false; // might already be the case
|
|
|
|
if (!(alt || ctrl)) { // if ALT or CTRL were not pressed
|
|
ram[0x3F4] = 0; // unset the Power-UP byte
|
|
puce6502RST(); // do a cold reset
|
|
memset(ram, 0, sizeof(ram));
|
|
}
|
|
}
|
|
|
|
if (event.type == SDL_KEYDOWN) { // a key has been pressed
|
|
switch (event.key.keysym.sym) {
|
|
|
|
// EMULATOR CONTROLS :
|
|
|
|
case SDLK_F1: // SAVES
|
|
if (ctrl) {
|
|
if (saveFloppy(0))
|
|
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "Save", "\nDisk 1 saved back to file\n", NULL);
|
|
else
|
|
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Save", "\nTError while saving Disk 1\n", NULL);
|
|
} else if (alt) {
|
|
if (saveFloppy(1))
|
|
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "Save", "\nDisk 2 saved back to file\n", NULL);
|
|
else
|
|
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Save", "\nError while saving Disk 2\n", NULL);
|
|
} else {
|
|
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_WARNING, "Save", "CTRL-F1 to save D1\nALT-F1 to save D2\n", NULL);
|
|
}
|
|
break;
|
|
|
|
|
|
case SDLK_F2: { // SCREENSHOTS
|
|
sshot = SDL_GetWindowSurface(wdo);
|
|
SDL_RenderReadPixels(rdr, NULL, SDL_GetWindowPixelFormat(wdo), sshot->pixels, sshot->pitch);
|
|
workDir[workDirSize] = 0;
|
|
int i = -1, a = 0, b = 0;
|
|
while (disk[0].filename[++i] != '\0') {
|
|
if (disk[0].filename[i] == '\\') a = i;
|
|
if (disk[0].filename[i] == '.') b = i;
|
|
}
|
|
strncat(workDir, "screenshots\\", 14);
|
|
if (a != b)
|
|
strncat(workDir, disk[0].filename + a, b - a);
|
|
else
|
|
strncat(workDir, "no disk", 10);
|
|
strncat(workDir, ".bmp", 5);
|
|
SDL_SaveBMP(sshot, workDir);
|
|
SDL_FreeSurface(sshot);
|
|
}
|
|
break;
|
|
|
|
case SDLK_F3: // PASTE text from clipboard
|
|
if (SDL_HasClipboardText()) {
|
|
char *clipboardText = SDL_GetClipboardText();
|
|
int c = 0;
|
|
while (clipboardText[c]) { // all chars until ascii NUL
|
|
KBD = clipboardText[c++] | 0x80; // set bit7
|
|
if (KBD == 0x8A) KBD = 0x8D; // translate Line Feed to Carriage Ret
|
|
puce6502Exec(400000); // give cpu (and applesoft) some cycles to process each char
|
|
}
|
|
SDL_free(clipboardText); // release the ressource
|
|
}
|
|
break;
|
|
|
|
case SDLK_F4: // VOLUME
|
|
if (shift && (volume < 120)) volume++; // increase volume
|
|
if (ctrl && (volume > 0)) volume--; // decrease volume
|
|
if (!ctrl && !shift) muted = !muted; // toggle mute / unmute
|
|
for (int i = 0; i < audioBufferSize; i++) { // update the audio buffers,
|
|
audioBuffer[true][i] = volume; // one used when SPKR is true
|
|
audioBuffer[false][i] = -volume; // the other when SPKR is false
|
|
}
|
|
break;
|
|
|
|
case SDLK_F5: // JOYSTICK Release Speed
|
|
if (shift && (GCReleaseSpeed < 127)) GCReleaseSpeed += 2; // increase Release Speed
|
|
if (ctrl && (GCReleaseSpeed > 1)) GCReleaseSpeed -= 2; // decrease Release Speed
|
|
if (!ctrl && !shift) GCReleaseSpeed = 8; // reset Release Speed to 8
|
|
break;
|
|
|
|
case SDLK_F6: // JOYSTICK Action Speed
|
|
if (shift && (GCActionSpeed < 127)) GCActionSpeed += 2; // increase Action Speed
|
|
if (ctrl && (GCActionSpeed > 1)) GCActionSpeed -= 2; // decrease Action Speed
|
|
if (!ctrl && !shift) GCActionSpeed = 8; // reset Action Speed to 8
|
|
break;
|
|
|
|
case SDLK_F7: // ZOOM
|
|
if (shift && (zoom < 8)) zoom++; // zoom in
|
|
if (ctrl && (zoom > 1)) zoom--; // zoom out
|
|
if (!ctrl && !shift) zoom = 2; // reset zoom to 2
|
|
SDL_SetWindowSize(wdo, 280 * zoom, 192 * zoom); // update window size
|
|
SDL_RenderSetScale(rdr, zoom, zoom); // update renderer size
|
|
break;
|
|
|
|
case SDLK_F10: paused = !paused; break; // toggle pause
|
|
|
|
case SDLK_F11: puce6502RST(); break; // simulate a reset
|
|
|
|
case SDLK_F12: // help box
|
|
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "Help",
|
|
"\tReinette ][ plus v0.4.8\n"
|
|
"\n"
|
|
"ctrl F1\twrites the changes of the floppy in drive 0\n"
|
|
"alt F1\twrites the changes of the floppy in drive 1\n"
|
|
"\n"
|
|
"F2\tsave a screenshot into the screenshots directory\n"
|
|
"F3\tpaste text from clipboard\n"
|
|
"\n"
|
|
"F4\tmute / un-mute sound\n"
|
|
"shift F4\tincrease volume\n"
|
|
"ctrl F4\tdecrease volume\n"
|
|
"\n"
|
|
"F5\treset joystick release speed\n"
|
|
"shift F5\tincrease joystick release speed\n"
|
|
"crtl F5\tdecrease joystick release speed\n"
|
|
"\n"
|
|
"F6\treset joystick action speed\n"
|
|
"shift F6\tincrease joystick action speed\n"
|
|
"crtl F6\tdecrease joystick action speed\n"
|
|
"\n"
|
|
"F7\treset zoom to 2:1\n"
|
|
"shift F7\tincrease zoom up to 8:1\n"
|
|
"ctrl F7\tdecrease zoom down to 1:1\n"
|
|
"\n"
|
|
"F10\tpause / un-pause the emulator\n"
|
|
"F11\treset\n"
|
|
"\n"
|
|
"F12\tthis help\n"
|
|
"\n"
|
|
"More information at github.com/ArthurFerreira2\n", NULL);
|
|
break;
|
|
|
|
// EMULATED KEYS :
|
|
|
|
case SDLK_a: KBD = ctrl ? 0x81: 0xC1; break; // a
|
|
case SDLK_b: KBD = ctrl ? 0x82: 0xC2; break; // b STX
|
|
case SDLK_c: KBD = ctrl ? 0x83: 0xC3; break; // c ETX
|
|
case SDLK_d: KBD = ctrl ? 0x84: 0xC4; break; // d EOT
|
|
case SDLK_e: KBD = ctrl ? 0x85: 0xC5; break; // e
|
|
case SDLK_f: KBD = ctrl ? 0x86: 0xC6; break; // f ACK
|
|
case SDLK_g: KBD = ctrl ? 0x87: 0xC7; break; // g BELL
|
|
case SDLK_h: KBD = ctrl ? 0x88: 0xC8; break; // h BS
|
|
case SDLK_i: KBD = ctrl ? 0x89: 0xC9; break; // i HTAB
|
|
case SDLK_j: KBD = ctrl ? 0x8A: 0xCA; break; // j LF
|
|
case SDLK_k: KBD = ctrl ? 0x8B: 0xCB; break; // k VTAB
|
|
case SDLK_l: KBD = ctrl ? 0x8C: 0xCC; break; // l FF
|
|
case SDLK_m: KBD = ctrl ? shift ? 0x9D: 0x8D: 0xCD; break; // m CR ]
|
|
case SDLK_n: KBD = ctrl ? shift ? 0x9E: 0x8E: 0xCE; break; // n ^
|
|
case SDLK_o: KBD = ctrl ? 0x8F: 0xCF; break; // o
|
|
case SDLK_p: KBD = ctrl ? shift ? 0x80: 0x90: 0xD0; break; // p @
|
|
case SDLK_q: KBD = ctrl ? 0x91: 0xD1; break; // q
|
|
case SDLK_r: KBD = ctrl ? 0x92: 0xD2; break; // r
|
|
case SDLK_s: KBD = ctrl ? 0x93: 0xD3; break; // s ESC
|
|
case SDLK_t: KBD = ctrl ? 0x94: 0xD4; break; // t
|
|
case SDLK_u: KBD = ctrl ? 0x95: 0xD5; break; // u NAK
|
|
case SDLK_v: KBD = ctrl ? 0x96: 0xD6; break; // v
|
|
case SDLK_w: KBD = ctrl ? 0x97: 0xD7; break; // w
|
|
case SDLK_x: KBD = ctrl ? 0x98: 0xD8; break; // x CANCEL
|
|
case SDLK_y: KBD = ctrl ? 0x99: 0xD9; break; // y
|
|
case SDLK_z: KBD = ctrl ? 0x9A: 0xDA; break; // z
|
|
case SDLK_LEFTBRACKET: KBD = ctrl ? 0x9B: 0xDB; break; // [ {
|
|
case SDLK_BACKSLASH: KBD = ctrl ? 0x9C: 0xDC; break; // \ |
|
|
case SDLK_RIGHTBRACKET: KBD = ctrl ? 0x9D: 0xDD; break; // ] }
|
|
case SDLK_BACKSPACE: KBD = ctrl ? 0xDF: 0x88; break; // BS
|
|
case SDLK_0: KBD = shift? 0xA9: 0xB0; break; // 0 )
|
|
case SDLK_1: KBD = shift? 0xA1: 0xB1; break; // 1 !
|
|
case SDLK_2: KBD = shift? 0xC0: 0xB2; break; // 2
|
|
case SDLK_3: KBD = shift? 0xA3: 0xB3; break; // 3 #
|
|
case SDLK_4: KBD = shift? 0xA4: 0xB4; break; // 4 $
|
|
case SDLK_5: KBD = shift? 0xA5: 0xB5; break; // 5 %
|
|
case SDLK_6: KBD = shift? 0xDE: 0xB6; break; // 6 ^
|
|
case SDLK_7: KBD = shift? 0xA6: 0xB7; break; // 7 &
|
|
case SDLK_8: KBD = shift? 0xAA: 0xB8; break; // 8 *
|
|
case SDLK_9: KBD = shift? 0xA8: 0xB9; break; // 9 (
|
|
case SDLK_QUOTE: KBD = shift? 0xA2: 0xA7; break; // ' "
|
|
case SDLK_EQUALS: KBD = shift? 0xAB: 0xBD; break; // = +
|
|
case SDLK_SEMICOLON: KBD = shift? 0xBA: 0xBB; break; // ; :
|
|
case SDLK_COMMA: KBD = shift? 0xBC: 0xAC; break; // , <
|
|
case SDLK_PERIOD: KBD = shift? 0xBE: 0xAE; break; // . >
|
|
case SDLK_SLASH: KBD = shift? 0xBF: 0xAF; break; // / ?
|
|
case SDLK_MINUS: KBD = shift? 0xDF: 0xAD; break; // - _
|
|
case SDLK_BACKQUOTE: KBD = shift? 0xFE: 0xE0; break; // ` ~
|
|
case SDLK_LEFT: KBD = 0x88; break; // BS
|
|
case SDLK_RIGHT: KBD = 0x95; break; // NAK
|
|
case SDLK_SPACE: KBD = 0xA0; break;
|
|
case SDLK_ESCAPE: KBD = 0x9B; break; // ESC
|
|
case SDLK_RETURN: KBD = 0x8D; break; // CR
|
|
|
|
// EMULATED JOYSTICK :
|
|
|
|
case SDLK_KP_1: GCD[0] = -1; GCA[0] = 1; break; // pdl0 <-
|
|
case SDLK_KP_3: GCD[0] = 1; GCA[0] = 1; break; // pdl0 ->
|
|
case SDLK_KP_5: GCD[1] = -1; GCA[1] = 1; break; // pdl1 <-
|
|
case SDLK_KP_2: GCD[1] = 1; GCA[1] = 1; break; // pdl1 ->
|
|
}
|
|
}
|
|
|
|
if (event.type == SDL_KEYUP) {
|
|
switch (event.key.keysym.sym) {
|
|
case SDLK_KP_1: GCD[0] = 1; GCA[0] = 0; break; // pdl0 ->
|
|
case SDLK_KP_3: GCD[0] = -1; GCA[0] = 0; break; // pdl0 <-
|
|
case SDLK_KP_5: GCD[1] = 1; GCA[1] = 0; break; // pdl1 ->
|
|
case SDLK_KP_2: GCD[1] = -1; GCA[1] = 0; break; // pdl1 <-
|
|
}
|
|
}
|
|
}
|
|
|
|
for (int pdl = 0; pdl < 2; pdl++) { // update the two paddles positions
|
|
if (GCA[pdl]) { // actively pushing the stick
|
|
GCP[pdl] += GCD[pdl] * GCActionSpeed;
|
|
if (GCP[pdl] > 255) GCP[pdl] = 255;
|
|
if (GCP[pdl] < 0) GCP[pdl] = 0;
|
|
} else { // the stick is return back to center
|
|
GCP[pdl] += GCD[pdl] * GCReleaseSpeed;
|
|
if (GCD[pdl] == 1 && GCP[pdl] > 127) GCP[pdl] = 127;
|
|
if (GCD[pdl] == -1 && GCP[pdl] < 127) GCP[pdl] = 127;
|
|
}
|
|
}
|
|
|
|
|
|
//============================================================= VIDEO OUTPUT
|
|
|
|
// HIGH RES GRAPHICS
|
|
if (!TEXT && HIRES) {
|
|
uint16_t word;
|
|
uint8_t bits[16], bit, pbit, colorSet, even;
|
|
uint16_t vRamBase = 0x2000 + PAGE2 * 0x2000;
|
|
uint8_t lastLine = MIXED ? 160 : 192;
|
|
uint8_t colorIdx = 0; // to index the color arrays
|
|
|
|
for (int line = 0; line < lastLine; line++) { // for every line
|
|
for (int col = 0; col < 40; col += 2) { // for every 7 horizontal dots
|
|
int x = col * 7;
|
|
even = 0;
|
|
|
|
word = (uint16_t)(ram[vRamBase + offsetHGR[line] + col + 1]) << 8; // store the two next bytes into 'word'
|
|
word += ram[vRamBase + offsetHGR[line] + col]; // in reverse order
|
|
|
|
if (HiResCache[line][col] != word || !flashCycle) { // check if this group of 7 dots need a redraw
|
|
|
|
for (bit=0; bit < 16; bit++) // store all bits 'word' into 'bits'
|
|
bits[bit] = (word >> bit) & 1;
|
|
colorSet = bits[7] * 4; // select the right color set
|
|
pbit = previousBit[line][col]; // the bit value of the left dot
|
|
bit = 0; // starting at 1st bit of 1st byte
|
|
|
|
while (bit < 15) { // until we reach bit7 of 2nd byte
|
|
if (bit == 7) { // moving into the second byte
|
|
colorSet = bits[15] * 4; // update the color set
|
|
bit++; // skip bit 7
|
|
}
|
|
colorIdx = even + colorSet + (bits[bit] << 1) + (pbit);
|
|
SDL_SetRenderDrawColor(rdr, hcolor[colorIdx][0], hcolor[colorIdx][1], hcolor[colorIdx][2], SDL_ALPHA_OPAQUE);
|
|
SDL_RenderDrawPoint(rdr, x++, line);
|
|
pbit = bits[bit++]; // proceed to the next pixel
|
|
even = even ? 0 : 8; // one pixel every two is darker
|
|
}
|
|
|
|
HiResCache[line][col] = word; // update the video cache
|
|
if ((col < 37) && (previousBit[line][col + 2] != pbit)) { // check color franging effect on the dot after
|
|
previousBit[line][col + 2] = pbit; // set pbit and clear the
|
|
HiResCache[line][col + 2] = -1; // video cache for next dot
|
|
}
|
|
} // if (HiResCache[line][col] ...
|
|
}
|
|
}
|
|
}
|
|
|
|
// lOW RES GRAPHICS
|
|
else if (!TEXT) { // and not in HIRES
|
|
uint16_t vRamBase = 0x400 + PAGE2 * 0x0400;
|
|
uint8_t lastLine = MIXED ? 20 : 24;
|
|
uint8_t glyph; // 2 blocks in GR
|
|
uint8_t colorIdx = 0; // to index the color arrays
|
|
|
|
for (int col = 0; col < 40; col++) { // for each column
|
|
pixelGR.x = col * 7;
|
|
for (int line = 0; line < lastLine; line++) { // for each row
|
|
pixelGR.y = line * 8; // first block
|
|
|
|
glyph = ram[vRamBase + offsetGR[line] + col]; // read video memory
|
|
if (LoResCache[line][col] != glyph || !flashCycle) {
|
|
LoResCache[line][col] = glyph;
|
|
|
|
colorIdx = glyph & 0x0F; // first nibble
|
|
SDL_SetRenderDrawColor(rdr, color[colorIdx][0], color[colorIdx][1], color[colorIdx][2], SDL_ALPHA_OPAQUE);
|
|
SDL_RenderFillRect(rdr, &pixelGR);
|
|
|
|
pixelGR.y += 4; // second block
|
|
colorIdx = (glyph & 0xF0) >> 4; // second nibble
|
|
SDL_SetRenderDrawColor(rdr, color[colorIdx][0], color[colorIdx][1], color[colorIdx][2], SDL_ALPHA_OPAQUE);
|
|
SDL_RenderFillRect(rdr, &pixelGR);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// TEXT 40 COLUMNS
|
|
if (TEXT || MIXED) { // not Full Graphics
|
|
uint16_t vRamBase = 0x400 +PAGE2 * 0x0400;
|
|
uint8_t firstLine = TEXT ? 0 : 20;
|
|
uint8_t glyph; // a TEXT character
|
|
|
|
for (int col = 0; col < 40; col++) { // for each column
|
|
dstRect.x = col * 7;
|
|
for (int line = firstLine; line < 24; line++) { // for each row
|
|
dstRect.y = line * 8;
|
|
|
|
glyph = ram[vRamBase + offsetGR[line] + col]; // read video memory
|
|
if (glyph > 0x7F) glyphAttr = A_NORMAL; // is NORMAL ?
|
|
else if (glyph < 0x40) glyphAttr = A_INVERSE; // is INVERSE ?
|
|
else glyphAttr = A_FLASH; // it's FLASH !
|
|
|
|
if (glyphAttr==A_FLASH || TextCache[line][col]!=glyph || !flashCycle){
|
|
TextCache[line][col] = glyph;
|
|
|
|
glyph &= 0x7F; // unset bit 7
|
|
if (glyph > 0x5F) glyph &= 0x3F; // shifts to match
|
|
if (glyph < 0x20) glyph |= 0x40; // the ASCII codes
|
|
|
|
if (glyphAttr==A_NORMAL || (glyphAttr==A_FLASH && flashCycle<15))
|
|
SDL_RenderCopy(rdr, normCharTexture, &charRects[glyph], &dstRect);
|
|
else
|
|
SDL_RenderCopy(rdr, revCharTexture, &charRects[glyph], &dstRect);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
//====================================================== DISPLAY DISK STATUS
|
|
|
|
if (disk[curDrv].motorOn) { // drive is active
|
|
if (disk[curDrv].writeMode)
|
|
SDL_SetRenderDrawColor(rdr, 255, 0, 0, 85); // red for writes
|
|
else
|
|
SDL_SetRenderDrawColor(rdr, 0, 255, 0, 85); // green for reads
|
|
SDL_RenderFillRect(rdr, &drvRect[curDrv]); // square actually
|
|
}
|
|
|
|
|
|
//========================================================= SDL RENDER FRAME
|
|
|
|
if (++flashCycle == 30) // increase cursor flash cycle
|
|
flashCycle = 0; // reset to zero every half second
|
|
SDL_RenderPresent(rdr); // swap buffers
|
|
} // while (running)
|
|
|
|
|
|
//================================================ RELEASE RESSOURSES AND EXIT
|
|
|
|
SDL_AudioQuit();
|
|
SDL_Quit();
|
|
return 0;
|
|
}
|