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Spectrum.c
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Spectrum.c
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/****************************************************************************\
* *
* Spectrum.c *
* *
* Spectrum specific subroutines for the WL project *
* *
* (c) 2012-2019 by CH, Copyright 2019-2025 Valerio Messina *
* *
* V 2.10 - 20250106 *
* *
* Spectrum.c is part of Wilderland - A Hobbit Environment *
* Wilderland is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, either version 2 of the License, or *
* (at your option) any later version. *
* *
* Wilderland is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with Wilderland. If not, see <http://www.gnu.org/licenses/>. *
* *
\****************************************************************************/
/*** INCLUDES ***************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "Spectrum.h"
#include "WL.h"
#include "SDLTWE.h"
/*** GLOBAL VARIABLES *******************************************************/
#include "GlobalVars.h"
color_t ColorTable[] = {
SC_BLACK, SC_BLUE, SC_RED, SC_MAGENTA, SC_GREEN, SC_CYAN, SC_YELLOW, SC_WHITE,
SC_BRBLACK, SC_BRBLUE, SC_BRRED, SC_BRMAGENTA, SC_BRGREEN, SC_BRCYAN, SC_BRYELLOW, SC_BRWHITE
};
// Spectrum half row port addresses
//SHRP shrp[] = { SHRP_VCXZc, SHRP_GFDSA, SHRP_TREWQ, SHRP_54321, SHRP_67890, SHRP_YUIOP, SHRP_HJKLe, SHRP_BNMas };
/****************************************************************************\
* SetQuadPixel *
* *
\****************************************************************************/
void SetQuadPixel(struct TextWindowStruct *TW, int x, int y, color_t color) {
uint32_t* pixmem32;
pixmem32 = (uint32_t*)TW->framePtr + 2 * (y * TW->rect.w) + 2 * x;
*pixmem32++ = color;
*pixmem32 = color;
if (NoScanLines) {
pixmem32 += TW->rect.w; //pitch / BYTESPERPIXEL : below 1 pixel line
*pixmem32-- = color;
*pixmem32 = color;
}
SDLTWE_SetPixel(TW, 2*x , 2*y, color);
SDLTWE_SetPixel(TW, 2*x+1, 2*y, color);
if (NoScanLines) {
SDLTWE_SetPixel(TW, 2*x , 2*y+1, color);
SDLTWE_SetPixel(TW, 2*x+1, 2*y+1, color);
}
}
/****************************************************************************\
* WriteScreenByte update Game Texture with Spectrum frame buffer *
* *
\****************************************************************************/
void WriteScreenByte(word address, byte v) {
int i;
byte xx, yy, mask, attr, BRIGHT;
color_t ColI, ColP;
if (address < SL_SCREENSTART || address > SL_SCREENEND)
return;
xx = (byte) (address & 0x001F);
yy = (byte) (((address & 0x1800) >> 5) | ((address & 0x0700) >> 8) | ((address & 0x00E0) >> 2));
attr = ZXmem[SL_ATTRIBUTESTART + xx + ((yy & 0xF8) << 2)];
BRIGHT = (attr & 0x40) >> 3;
ColI = ColorTable[(attr & 0x07) + BRIGHT];
ColP = ColorTable[((attr & 0x38) >> 3) + BRIGHT];
mask = 0x80;
for (i = 0; i <= 7; i++, mask >>= 1) {
//SetQuadPixel(&GameWin, GAMEWINPOSX / 2 + (xx << 3) + i, GAMEWINPOSY / 2 + yy, (v & mask) ? ColI : ColP);
SetQuadPixel(&GameWin, (xx << 3) + i, yy, (v & mask) ? ColI : ColP);
}
}
/****************************************************************************\
* WriteAttributeByte *
* *
\****************************************************************************/
void WriteAttributeByte(word address, byte v) {
word i, base_adr;
word x, y;
if (address < SL_ATTRIBUTESTART || address > SL_ATTRIBUTEEND)
return;
y = ((address - SL_ATTRIBUTESTART) / 32) * 8;
x = (address - SL_ATTRIBUTESTART) % 32;
base_adr = SL_SCREENSTART + (((y & 0xC0) << 5) | ((y & 0x38) << 2) | ((y & 0x03) << 8));
base_adr = (base_adr + x) & 0xF8FF;
for (i = 0; i <= 0x700; i += 0x100)
WriteScreenByte(base_adr + i, ZXmem[base_adr + i]);
}
/****************************************************************************\
* PrintObjNrActingAnimal *
* *
\****************************************************************************/
void PrintObjNrActingAnimal(byte onaa) {
char aa[20];
strcpy(aa, "[");
sprintf(aa+1, "%02X", onaa);
strcat(aa,"]:");
SDLTWE_PrintString(&LogWin, aa, &CharSet, SC_BLACK, SC_WHITE);
}
/****************************************************************************\
* RdZ80 *
* *
\****************************************************************************/
byte RdZ80(word A) {
return ZXmem[A];
}
/****************************************************************************\
* RdwZ80 *
* *
\****************************************************************************/
word RdwZ80(word a) {
byte h, l;
l = RdZ80(a);
h = RdZ80(a+1);
return (((word)h)<<8 | l);
}
/****************************************************************************\
* WrZ80 *
* *
\****************************************************************************/
void WrZ80(word A, byte v) {
if (A <= SL_ROMEND) // skip write to the 16 k ROM
return;
ZXmem[A] = v; // update Spectrum memory
if (A <= SL_SCREENEND) { // write to the frame buffer
WriteScreenByte(A, v); // update SDL screen
return;
}
if (A <= SL_ATTRIBUTEEND) { // write to the attrib buffer
WriteAttributeByte(A, v); // update SDL screen
return;
}
}
/****************************************************************************\
* WrwZ80 *
* *
\****************************************************************************/
void WrwZ80(word a, word w) {
byte h, l;
l = w & 0xFF;
h = w >> 8;
WrZ80(a, l);
WrZ80(a+1, h);
}
#ifdef __LCC__
#pragma optimize(none)
#endif
/****************************************************************************\
* InZ80 *
* *
* Simulates a basic keyboard interface. *
* *
* In Pelles C 6.50.8 optimiziation 'time' causes a hard to detect optimi- *
* zation-error. Therefore optimizition is turned off for this function with *
* the private #pragma optimize(none) instruction! *
\****************************************************************************/
byte InZ80(word P) {
if ((P & 0xFF) != 0xFE) { // we only support the keyboard port 0xFE
printf("Spectrum.c: InZ80() tried to read from unsupported port 0x%04X.\n", P);
return 0xFF;
}
//printf("port:0x%04X Mod:%u Key:%u every\n", P, CurrentPressedMod, CurrentPressedKey);
if (P == 0x00FE) { // all keyboard rows at once (the upper 8 bit select the half row), used to wait for any key
if (CurrentPressedKey) { // SDL read a key and Hobbit is reading all half rows
// happen on: no-key, ENTER=13, 32=' ',
// 48=0, ..., 57=9, CURSORS<53-56>,
// 97=a, ..., 122=z,
// 232=, 242=, 249=
// 1073742049=SDLK_LSHIFT, 1073742053=SDLK_RSHIFT, 1073741881=SDLK_CAPSLOCK, 1073742050=SDLK_LALT
if (CurrentPressedKey!=SDLK_RETURN && CurrentPressedKey!=SDLK_SPACE && \
(CurrentPressedKey<SDLK_0 || CurrentPressedKey>SDLK_9) && \
(CurrentPressedKey<SDLK_a || CurrentPressedKey>SDLK_z) && \
CurrentPressedKey!=SDLK_LSHIFT && CurrentPressedKey!=SDLK_RSHIFT && \
CurrentPressedKey!=SDLK_LALT && CurrentPressedKey!=SDLK_RALT && \
CurrentPressedKey!=SDLK_CAPSLOCK && \
CurrentPressedKey!=232 && CurrentPressedKey!=242 && CurrentPressedKey!=249) \
printf("P==0x00FE CurrentPressedKey:0x%08X CurrentPressedMod:0x%08X unhandled\n", CurrentPressedKey, CurrentPressedMod);
switch (CurrentPressedKey) { // Hobbit can know only the half row colum bit so 8 keys, not the exact key
case 'a':
case 'q':
case '1':
case '0':
case 'p':
case SDLK_RETURN:
case ' ':
//CurrentPressedKey=0;
return (0xFF - 0x01);
case 'z':
case 's':
case 'w':
case '2':
case '9':
case 'o':
case 'l':
//CurrentPressedKey=0;
return (0xFF - 0x02);
case 'x':
case 'd':
case 'e':
case '3':
case '8':
case 'i':
case 'k':
case 'm':
//CurrentPressedKey=0;
return (0xFF - 0x04);
case 'c':
case 'f':
case 'r':
case '4':
case '7':
case 'u':
case 'j':
case 'n':
//CurrentPressedKey=0;
return (0xFF - 0x08);
case 'v':
case 'g':
case 't':
case '5':
case '6':
case 'y':
case 'h':
case 'b':
//CurrentPressedKey=0;
return (0xFF - 0x10);
default:
CurrentPressedKey=0;
return 0xFF; // no key pressed
} // switch
} else {
return 0xFF; // no key pressed
}
}
P >>= 8;
switch (CurrentPressedKey) {
// CAPS SHIFT is ignored
case 'z':
if (P == SHRP_VCXZc)
return (0xFF - 0x02);
break;
case 'x':
if (P == SHRP_VCXZc)
return (0xFF - 0x04);
break;
case 'c':
if (P == SHRP_VCXZc)
return (0xFF - 0x08);
break;
case 'v':
if (P == SHRP_VCXZc)
return (0xFF - 0x10);
break;
case 'a':
if (P == SHRP_GFDSA)
return (0xFF - 0x01);
break;
case 's':
if (P == SHRP_GFDSA)
return (0xFF - 0x02);
break;
case 'd':
if (P == SHRP_GFDSA)
return (0xFF - 0x04);
break;
case 'f':
if (P == SHRP_GFDSA)
return (0xFF - 0x08);
break;
case 'g':
if (P == SHRP_GFDSA)
return (0xFF - 0x10);
break;
case 'q':
if (P == SHRP_TREWQ)
return (0xFF - 0x01);
break;
case 'w':
if (P == SHRP_TREWQ)
return (0xFF - 0x02);
break;
case 'e':
if (P == SHRP_TREWQ)
return (0xFF - 0x04);
break;
case 'r':
if (P == SHRP_TREWQ)
return (0xFF - 0x08);
break;
case 't':
if (P == SHRP_TREWQ)
return (0xFF - 0x10);
break;
case '1':
if (P == SHRP_54321)
return (0xFF - 0x01);
break;
case '2':
//printf("port:0x%X Mod:%u Key:%u out='@'\n", P, CurrentPressedMod, CurrentPressedKey);
if (CurrentPressedMod & (KMOD_LALT|KMOD_RALT|KMOD_LSHIFT|KMOD_RSHIFT)) { // ALT|SHIFT+2 = US:'@' or IT:'"' ==>
//printf("port:0x%02X Mod:%u Key:%u out='@'\n", P, CurrentPressedMod, CurrentPressedKey);
if (P == SHRP_BNMas) {
//printf("port:0x%02X Mod:%u Key:%u out='@'\n", P, CurrentPressedMod, CurrentPressedKey);
return (0xFF - 0x02); // Symbol Shift (+ 2) ==> '@'
}
if (P == SHRP_54321) {
//printf("port:0x%02X Mod:%u Key:%u out='@'\n", P, CurrentPressedMod, CurrentPressedKey);
return (0xFF - 0x02); // (Symbol Shift +) 2 ==> '@'
}
}
if (P == SHRP_54321)
return (0xFF - 0x02); // simple 2
break;
case 242:
//printf("port:0x%02X Mod:%u Key:%u out='@'\n", P, CurrentPressedMod, CurrentPressedKey);
if (CurrentPressedMod & (KMOD_LALT|KMOD_RALT|KMOD_LSHIFT|KMOD_RSHIFT)) { // US: SHIFT+;=: or IT: SHIFT+o'=c ==>
//printf("port:0x%X Mod:%u Key:%u out='@'\n", P, CurrentPressedMod, CurrentPressedKey);
if (P == SHRP_BNMas) {
//printf("port:0x%02X Mod:%u Key:%u out='@'\n", P, CurrentPressedMod, CurrentPressedKey);
return (0xFF - 0x02); // Symbol Shift (+ 2) ==> '@'
}
if (P == SHRP_54321) {
//printf("port:0x%02X Mod:%u Key:%u out='@'\n", P, CurrentPressedMod, CurrentPressedKey);
return (0xFF - 0x02); // (Symbol Shift +) 2 ==> '@'
}
}
break;
case '3':
if (P == SHRP_54321)
return (0xFF - 0x04);
break;
case '4':
if (P == SHRP_54321)
return (0xFF - 0x08);
break;
case '5':
if (P == SHRP_54321)
return (0xFF - 0x10);
break;
case '0':
//printf("port:0x%X Mod:%u Key:%u out='0'\n", P, CurrentPressedMod, CurrentPressedKey);
if (CurrentPressedMod & (KMOD_LSHIFT|KMOD_RSHIFT)) { // SHIFT+0 ==>
//printf("port:0x%02X Mod:%u Key:%u out='SHIFT+0'\n", P, CurrentPressedMod, CurrentPressedKey);
if (P == SHRP_VCXZc) {
//printf("port:0x%02X Mod:%u Key:%u out='SHIFT+0'\n", P, CurrentPressedMod, CurrentPressedKey);
return (0xFF - 0x01); // Caps Shift (+ 0) ==> 'SHIFT+0'
}
if (P == SHRP_67890) {
//printf("port:0x%02X Mod:%u Key:%u out='SHIFT+0'\n", P, CurrentPressedMod, CurrentPressedKey);
return (0xFF - 0x01); // (Caps Shift +) 0 ==> 'SHIFT+0'
}
}
if (P == SHRP_67890) {
//printf("port:0x%02X Mod:%u Key:%u out='0'\n", P, CurrentPressedMod, CurrentPressedKey);
return (0xFF - 0x01); // simple 0
}
break;
case '9':
if (P == SHRP_67890)
return (0xFF - 0x02);
break;
case '8':
if (P == SHRP_67890)
return (0xFF - 0x04);
break;
case '7':
if (P == SHRP_67890)
return (0xFF - 0x08);
break;
case '6':
if (P == SHRP_67890)
return (0xFF - 0x10);
break;
case 'p':
//printf("port:0x%X Mod:%u Key:%u out='\"'\n", P, CurrentPressedMod, CurrentPressedKey);
if (CurrentPressedMod & (KMOD_LALT|KMOD_RALT|KMOD_LSHIFT|KMOD_RSHIFT)) { // ALT|SHIFT+p ==>
//printf("port:0x%02X Mod:%u Key:%u out='\"'\n", P, CurrentPressedMod, CurrentPressedKey);
if (P == SHRP_BNMas) {
//printf("port:0x%02X Mod:%u Key:%u out='\"'\n", P, CurrentPressedMod, CurrentPressedKey);
return (0xFF - 0x02); // Symbol Shift (+ p) ==> '"'
}
if (P == SHRP_YUIOP) {
//printf("port:0x%02X Mod:%u Key:%u out='\"'\n", P, CurrentPressedMod, CurrentPressedKey);
return (0xFF - 0x01); // (Symbol Shift +) p ==> '"'
}
}
if (P == SHRP_YUIOP)
return (0xFF - 0x01); // simple p
break;
case 224:
//printf("port:0x%02X Mod:%u Key:%u out='\"'\n", P, CurrentPressedMod, CurrentPressedKey);
if (CurrentPressedMod & (KMOD_LSHIFT|KMOD_RSHIFT)) { // US: SHIFT+'=" or IT: SHIFT+a'=� ==>
//printf("port:0x%02X Mod:%u Key:%u out='\"'\n", P, CurrentPressedMod, CurrentPressedKey);
if (P == SHRP_BNMas) {
//printf("port:0x%02X Mod:%u Key:%u out='\"'\n", P, CurrentPressedMod, CurrentPressedKey);
return (0xFF - 0x02); // Symbol Shift (+ p) ==> '"'
}
if (P == SHRP_YUIOP) {
//printf("port:0x%02X Mod:%u Key:%u out='\"'\n", P, CurrentPressedMod, CurrentPressedKey);
return (0xFF - 0x01); // (Symbol Shift +) p ==> '"'
}
}
break;
case 'o':
if (P == SHRP_YUIOP)
return (0xFF - 0x02);
break;
case 'i':
if (P == SHRP_YUIOP)
return (0xFF - 0x04);
break;
case 'u':
if (P == SHRP_YUIOP)
return (0xFF - 0x08);
break;
case 'y':
if (P == SHRP_YUIOP)
return (0xFF - 0x10);
break;
case SDLK_RETURN:
if (P == SHRP_HJKLe)
return (0xFF - 0x01);
break;
case 'l':
if (P == SHRP_HJKLe)
return (0xFF - 0x02);
break;
case 'k':
if (P == SHRP_HJKLe)
return (0xFF - 0x04);
break;
case 'j':
if (P == SHRP_HJKLe)
return (0xFF - 0x08);
break;
case 'h':
if (P == SHRP_HJKLe)
return (0xFF - 0x10);
break;
case ' ':
if (P == SHRP_BNMas)
return (0xFF - 0x01);
break;
// SYMBOL SHIFT is ignored
case 'm':
if (P == SHRP_BNMas)
return (0xFF - 0x04);
break;
case '.': // '.' ==>
if (P == SHRP_BNMas) {
//printf("port:0x%02X Mod:%u Key:%u out='.'\n", P, CurrentPressedMod, CurrentPressedKey);
return (0xFF - 0x04 - 0x02); // Symbol Shift + m = '.'
}
break;
case 'n':
if (P == SHRP_BNMas)
return (0xFF - 0x08);
break;
case ',': // ',' ==>
if (P == SHRP_BNMas) {
//printf("port:0x%02X Mod:%u Key:%u out=','\n", P, CurrentPressedMod, CurrentPressedKey);
return (0xFF - 0x08 - 0x02); // Symbol Shift + n = ','
}
break;
case 'b':
if (P == SHRP_BNMas)
return (0xFF - 0x10);
break;
case '\'': // IT: ' ==>
case '-': // US: - ==>
//printf("port:0x%02X Mod:%u Key:%u out='\"'\n", P, CurrentPressedMod, CurrentPressedKey);
if (P == SHRP_BNMas) {
//printf("port:0x%02X Mod:%u Key:%u out='\"'\n", P, CurrentPressedMod, CurrentPressedKey);
return (0xFF - 0x02); // Symbol Shift (+ p) ==> '"'
}
if (P == SHRP_YUIOP) {
//printf("port:0x%02X Mod:%u Key:%u out='\"'\n", P, CurrentPressedMod, CurrentPressedKey);
return (0xFF - 0x01); // (Symbol Shift +) p ==> '"'
}
break;
default:
return 0xFF; // no key pressed
}
return 0xFF; // no key pressed
}
#ifdef __LCC__
#pragma optimize(time)
#endif
/****************************************************************************\
* OutZ80 *
* *
\****************************************************************************/
void OutZ80(word P, byte v) {
return;
}
#if CPUEMUL == eZ80
/****************************************************************************\
* LoopZ80 *
* *
\****************************************************************************/
word LoopZ80(register Z80 *R) {
return 0;
}
/****************************************************************************\
* PatchZ80 *
* *
\****************************************************************************/
void PatchZ80(register Z80 *R) {
return;
}
#endif
/****************************************************************************\
* JumpZ80 called on JP, JR, CALL, RST, or RET *
* *
\****************************************************************************/
void JumpZ80(word PC) {
static char LastChar = 0;
byte a;
#if CPUEMUL == eZ80
a = z80.AF.B.h;
#endif
#if CPUEMUL == ez80emu
a = z80.registers.byte[Z80_A];
#endif
switch (HV) { // to make this fast...
case OWN:
if (PC == L_PRINT_CHAR_OWN) {
if (LastChar == 0x0D) {
LastChar = 0;
PrintObjNrActingAnimal(ZXmem[L_ACTING_ANIMAL_OWN]);
}
if (!ZXmem[L_SELECT_PRINTWIN_OWN]) { // only upper window
SDLTWE_PrintCharTextWindow(&LogWin, a, &CharSet, SC_BLACK, SC_WHITE);
LastChar = a;
}
}
break;
case V10:
if (PC == L_PRINT_CHAR_V10) {
if (LastChar == 0x0D) {
LastChar = 0;
PrintObjNrActingAnimal(ZXmem[L_ACTING_ANIMAL_V10]);
}
if (!ZXmem[L_SELECT_PRINTWIN_V10]) { // only upper window
SDLTWE_PrintCharTextWindow(&LogWin, a, &CharSet, SC_BLACK, SC_WHITE);
LastChar = a;
}
}
break;
case V12:
if (PC == L_PRINT_CHAR_V12) {
//printf("%02X=", a);
//if (a>=32) printf("%c ", a);
//else printf(" ");
if (LastChar == 0x0D) {
LastChar = 0;
PrintObjNrActingAnimal(ZXmem[L_ACTING_ANIMAL_V12]);
}
if (!ZXmem[L_SELECT_PRINTWIN_V12]) { // only upper window
SDLTWE_PrintCharTextWindow(&LogWin, a, &CharSet, SC_BLACK, SC_WHITE);
LastChar = a;
}
}
break;
}
}
#if CPUEMUL == ez80emu
void SystemCall (void* context) {
return;
}
#endif