mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-07-05 04:28:54 +00:00
789 lines
20 KiB
C
789 lines
20 KiB
C
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#define TEST
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#include <string.h>
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typedef unsigned char byte;
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typedef signed char sbyte;
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typedef unsigned short word;
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typedef signed short sword;
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/// HARDWARE
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__sfr __at(0x00) hw_col0r; // palette 0
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__sfr __at(0x01) hw_col1r;
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__sfr __at(0x02) hw_col2r;
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__sfr __at(0x03) hw_col3r;
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__sfr __at(0x04) hw_col0l;
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__sfr __at(0x05) hw_col1l;
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__sfr __at(0x06) hw_col2l;
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__sfr __at(0x07) hw_col3l; // palette 7
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__sfr __at(0x08) hw_intst; // intercept test feedback
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__sfr __at(0x09) hw_horcb; // horiz color boundary
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__sfr __at(0x0a) hw_verbl; // vertical blanking line * 2
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__sfr __at(0x0c) hw_magic; // magic register
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__sfr __at(0x0d) hw_infbk; // interrupt feedback
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__sfr __at(0x0e) hw_inmod; // interrupt enable
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__sfr __at(0x0f) hw_inlin; // interrupt line
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__sfr __at(0x19) hw_xpand; // expander register
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__sfr __at(0x10) hw_p1ctrl; // player controls
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__sfr __at(0x11) hw_p2ctrl; // player controls
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__sfr __at(0x12) hw_p3ctrl; // player controls
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__sfr __at(0x13) hw_p4ctrl; // player controls
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#define M_SHIFT0 0x00
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#define M_SHIFT1 0x01
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#define M_SHIFT2 0x02
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#define M_SHIFT3 0x03
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#define M_XPAND 0x08
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#define M_MOVE 0x00
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#define M_OR 0x10
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#define M_XOR 0x20
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#define M_FLOP 0x40
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#define M_SHIFT(x) ((x)&3)
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#define XPAND_COLORS(off,on) (((off)&3) | (((on)&3)<<2))
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// font options
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#define OPT_1x1 0x00
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#define OPT_2x2 0x40
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#define OPT_4x4 0x80
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#define OPT_8x8 0xc0
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#define OPT_XOR 0x20
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#define OPT_OR 0x10
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#define OPT_ON(n) ((n)<<2)
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#define OPT_OFF(n) ((n))
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// bcd options
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#define DISBCD_SML 0x40
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#define DISBCD_NOZERO 0x80
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/// GRAPHICS FUNCTIONS
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#define VHEIGHT 89 // number of scanlines
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#define VBWIDTH 40 // number of bytes per scanline
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#define PIXWIDTH 160 // 4 pixels per byte
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//#define EXIT_CLIPDEST(addr) if ((((word)addr)&0xfff) >= 0xe10) return
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#define EXIT_CLIPDEST(addr)
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byte __at (0x0000) vmagic[VHEIGHT][VBWIDTH];
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byte __at (0x4000) vidmem[VHEIGHT][VBWIDTH];
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// start @ $4FCE
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volatile word MUZPC; // music PC
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volatile word MUZSP; // music SP
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volatile byte PVOLAB; // channels A and B volume
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volatile byte PVOLMC; // channel C volume and noise mask
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volatile byte VOICES; // voice smask
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volatile byte CT[8]; // counter timers
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volatile byte CNT;
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volatile byte SEMI4S;
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volatile byte OPOT[4];
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volatile byte KEYSEX;
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volatile byte OSW[4];
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volatile word COLLST;
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volatile byte DURAT; // note duration
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volatile byte TMR60; // 1/60 sec timer
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volatile byte TIMOUT; // blackout timer
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volatile byte GTSECS; // seconds timer
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volatile byte GTMINS; // minutes timer
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unsigned long RANSHT; // RNG
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byte NUMPLY; // # players
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byte ENDSCR[3]; // end score
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byte MRLOCK; // magic register lock out
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byte GAMSTB; // game status
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byte PRIOR; // music protect
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byte SENFLG; // sentry control
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byte* UMARGT; // user mask table (-64 bytes)
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word* USERTB; // user routine table (-128 bytes)
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#ifdef TEST
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#define MAIN _main
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#else
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#define MAIN 0x2000
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#endif
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// start routine @ 0x0
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void bios_start() __naked {
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__asm
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DI ; disable interrupts
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LD HL,#MAIN
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LD A,(HL) ; A <- mem[0x2000]
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CP #0x55 ; found sentinel byte? ($55)
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JP Z,FoundSentinel ; yes, load program
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JP MAIN
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FoundSentinel:
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LD SP,#0x4fce ; position stack below BIOS vars
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CALL _bios_init ; misc. bios init routines
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LD HL,#(MAIN+5) ; cartridge start vector
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LD A,(HL)
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INC HL
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LD H,(HL)
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LD L,A
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JP (HL) ; jump to cart start vector
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.ds 0x38 - 0x1b ; eat up space until 0x38
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__endasm;
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}
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void interrupt_0x38() __naked {
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__asm
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push hl
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push af
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push bc
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push de
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push ix
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push iy
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ld hl,#0
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add hl,sp
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push hl ; HL points to context block
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call _SYSCALL ; syscall handler
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pop hl
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pop iy
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pop ix
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pop de
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pop bc
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pop af
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pop hl
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ret
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__endasm;
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}
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void _predope() __naked {
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__asm
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.ds 0x200-0x52 ; skip to 0x200
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__endasm;
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}
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// DOPE vector @ 0x200
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void DOPE() __naked {
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__asm
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JP _STIMER
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JP _CTIMER
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.db 0x20, 8, 8, 1, 7 ; Font descriptor (big font)
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.dw _BIGFONT
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.db 0xa0, 4, 6, 1, 5 ; Font descriptor (small font)
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.dw _SMLFONT
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__endasm;
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}
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typedef struct {
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byte base_ch;
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byte frame_x;
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byte frame_y;
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byte pattern_x;
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byte pattern_y;
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const byte* chartab;
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} FontDescriptor;
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#define LOCHAR 0x20
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#define HICHAR 0x63
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extern const char BIGFONT[HICHAR-LOCHAR+1][7];
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extern const char SMLFONT[HICHAR-LOCHAR+1][5];
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const FontDescriptor __at(0x206) FNTSYS; // = { 0x20, 8, 8, 1, 7, (byte*)BIGFONT };
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const FontDescriptor __at(0x20d) FNTSML; // = { 0xa0, 4, 6, 1, 5, (byte*)SMLFONT };
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void hw_interrupt() __interrupt {
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CT[0]++;
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CT[1]++;
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CT[2]++;
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CT[3]++;
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if (++TMR60 == 60) {
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TMR60 = 0;
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if (++GTSECS == 60) {
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GTMINS++;
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}
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}
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}
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const void* const actint_vec = &hw_interrupt;
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void STIMER() {
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}
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void CTIMER() {
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}
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///// INTERPRETER
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typedef struct {
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union {
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struct {
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word iy,ix,de,bc,af,hl;
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} w;
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struct {
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byte iyl,iyh,ixl,ixh,e,d,c,b,f,a,l,h;
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} b;
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} regs;
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byte* params;
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} ContextBlock;
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#define REG_IY 0x1
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#define REG_E 0x2
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#define REG_D 0x4
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#define REG_C 0x8
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#define REG_B 0x10
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#define REG_IX 0x20
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#define REG_A 0x40
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#define REG_HL 0x80
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#define REG_DE (REG_D|REG_E)
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#define REG_BC (REG_B|REG_C)
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#define _IY (ctx->regs.w.iy)
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#define _IX (ctx->regs.w.ix)
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#define _DE (ctx->regs.w.de)
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#define _BC (ctx->regs.w.bc)
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#define _AF (ctx->regs.w.af)
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#define _HL (ctx->regs.w.hl)
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#define _IXL (ctx->regs.b.ixl)
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#define _IXH (ctx->regs.b.ixh)
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#define _IYL (ctx->regs.b.iyl)
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#define _IYH (ctx->regs.b.iyh)
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#define _E (ctx->regs.b.e)
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#define _D (ctx->regs.b.d)
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#define _C (ctx->regs.b.c)
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#define _B (ctx->regs.b.b)
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#define _A (ctx->regs.b.a)
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#define _L (ctx->regs.b.l)
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#define _H (ctx->regs.b.h)
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typedef void (Routine)();
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typedef void (SysRoutine)(ContextBlock *ctx);
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typedef struct {
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SysRoutine* routine;
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byte argmask;
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} SysCallEntry;
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void SYSCALL(ContextBlock *ctx);
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void INTPC(ContextBlock *ctx) {
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while (ctx->params[0] != 2) { // 2 = exit
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SYSCALL(ctx);
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}
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}
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// never called, hopefully
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void EXIT(ContextBlock *ctx) {
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ctx;
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}
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// jumps to HL
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void RCALL(ContextBlock *ctx) {
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((Routine*)_HL)();
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}
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// start interpreting at HL
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void MCALL(ContextBlock *ctx) {
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ctx; // TODO
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}
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// exit MCALL loop
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void MRET(ContextBlock *ctx) {
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ctx; // TODO
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}
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// jump within MCALL
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void MJUMP(ContextBlock *ctx) {
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ctx->params = (byte*) _HL; // TODO?
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}
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void suckParams(ContextBlock *ctx, byte argmask) {
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byte* dest = (byte*) ctx;
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byte* src = ctx->params;
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if (argmask & REG_IX) {
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_IXL = *src++;
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_IXH = *src++;
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}
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if (argmask & REG_E)
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_E = *src++;
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if (argmask & REG_D)
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_D = *src++;
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if (argmask & REG_C)
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_C = *src++;
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if (argmask & REG_B)
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_B = *src++;
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if (argmask & REG_A)
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_A = *src++;
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if (argmask & REG_HL) {
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_L = *src++;
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_H = *src++;
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}
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ctx->params = src;
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}
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void SUCK(ContextBlock* ctx) {
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suckParams(ctx, _B);
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}
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void ACTINT(ContextBlock *ctx) {
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ctx;
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hw_inlin = 200;
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hw_infbk = (byte) &actint_vec;
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hw_inmod = 8;
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__asm
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LD A,#0x2 ; I = 0x200
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LD I,A
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IM 2 ; mode 2
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EI ; enable interrupts
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__endasm;
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}
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// Outputs D to port 0A, B to port 09, A to port 0E.
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void SETOUT(ContextBlock *ctx) {
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hw_verbl = _D;
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hw_horcb = _B;
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hw_inmod = _A;
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}
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// sets color palettes from (HL)
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void COLSET(ContextBlock *ctx) {
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byte* palette = (byte*) _HL;
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hw_col3l = *palette++;
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hw_col2l = *palette++;
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hw_col1l = *palette++;
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hw_col0l = *palette++;
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hw_col3r = *palette++;
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hw_col2r = *palette++;
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hw_col1r = *palette++;
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hw_col0r = *palette++;
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}
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// Stores A in BC bytes starting at location DE.
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void FILL(ContextBlock *ctx) {
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byte* dest = (byte*) _DE;
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word count = _BC;
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byte val = _A;
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memset(dest, val, count);
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}
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void hline(byte x1, byte x2, byte y, byte pattern) {
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byte xb1 = x1/4;
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byte xb2 = x2/4;
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byte* dest = &vmagic[y][xb1];
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signed char nbytes = xb2 - xb1;
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hw_magic = M_SHIFT(x1) | M_XOR;
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while (--nbytes > 0) {
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*dest++ = pattern;
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}
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if (x2&3) *dest = 0;
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// TODO
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}
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// Fill rect (E,D,C,B) color A
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void RECTAN(const ContextBlock *ctx) {
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for (byte y=_D; y<_D+_B; y++) {
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hline(_E, _E+_C, y, _A);
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}
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}
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const char BIGFONT[HICHAR-LOCHAR+1][7] = {/*{count:68,w:8,h:7,brev:1}*/
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{0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x20,0x20,0x20,0x20,0x00,0x00,0x20},{0x50,0x50,0x00,0x00,0x00,0x00,0x00},{0x48,0xFC,0x48,0x48,0x48,0xFC,0x48},{0x20,0x78,0x80,0x70,0x08,0xF0,0x20},{0x00,0x48,0x10,0x20,0x40,0x90,0x00},{0x60,0x90,0x60,0xA0,0xA8,0x90,0x68},{0x60,0x60,0x20,0x00,0x00,0x00,0x00},{0x20,0x40,0x40,0x40,0x40,0x40,0x20},{0x40,0x20,0x20,0x20,0x20,0x20,0x40},{0x00,0xA8,0x70,0xF8,0x70,0xA8,0x00},{0x00,0x20,0x20,0xF8,0x20,0x20,0x00},{0x00,0x00,0x00,0x00,0x60,0x20,0x40},{0x00,0x00,0x00,0xF0,0x00,0x00,0x00},{0x00,0x00,0x00,0x00,0x00,0x60,0x60},{0x00,0x08,0x10,0x20,0x40,0x80,0x00},{0x70,0x88,0x88,0xA8,0x88,0x88,0x70},{0x20,0x60,0x20,0x20,0x20,0x20,0x70},{0x70,0x88,0x08,0x30,0x40,0x80,0xF8},{0x70,0x88,0x08,0x70,0x08,0x88,0x70},{0x10,0x30,0x50,0x90,0xF8,0x10,0x10},{0xF8,0x80,0x80,0x70,0x08,0x88,0x70},{0x70,0x88,0x80,0xF0,0x88,0x88,0x70},{0xF8,0x88,0x10,0x20,0x20,0x20,0x20},{0x70,0x88,0x88,0x70,0x88,0x88,0x70},{0x70,0x88,0x88,0x78,0x08,0x88,0x70},{0x00,0x00,0x60,0x00,0x60,0x00,0x00},{0x00,0x00,0x60,0x00,0x60,0x20,0x40},{0x10,0x20,0x40,0x80,0x40,0x20,0x10},{0x00,0x00,0xF8,0x00,0xF8,0x00,0x00},{0x40,0x20,0x10,0x08,0x10,0x20,0x40},{0x70,0x08,0x08,0x30,0x20,0x00,0x20},{0x70,0x88,0xB8,0xA8,0x90,0x80,0x70},{0x70,0x88,0x88,0xF8,0x88,0x88,0x88},{0xF0,0x88,0x88,0xF0,0x88,0x88,0xF0},{0x70,0x88,0x80,0x80,0x80,0x88,0x70},{0xF0,0x88,0x88,0x88,0x88,0x88,0xF0},{0xF8,0x80,0x80,0xF0,0x80,0x80,0xF8},{0xF8,0x80,0x80,0xF0,0x80,0x80,0x80},{0x70,0x88,0x80,0xB0,0x88,0x88,0x70},{0x88,0x88,0x88,0xF8,0x88,0x88,0x88},{0x70,0x20,0x20,0x20,0x20,0x20,0x70},{0x08,0x08,0x08,0x08,0x88,0x88,0x70},{0x88,0x90,0xA0,0xC0,0xA0,0x90,0x88},{0x80,0x80,0x80,0x80,0x80,0x80,0xF8},{0x88,0xD8,0xA8,0x88,0x88,0x88,0x88},{0x88,0xC8,0xA8,0xA8,0x98,0x88,0x88},{0xF8,0x88,0x88,0x88,0x88,0x88,0xF8},{0xF0,0x88,0x88,0xF0,0x80,0x80,0x80},{0x70,0x88,0x88,0xA8,0xA8,0x90,0x68},{0xF0,0x88,0x88,0xF0,0x90,0x90,0x88},{0x70,0x88,0x80,0x70,0x08,0x88,0x70},{0xF8,0x20,0x20,0x20,0x20,0x20,0x20},{0x88,0x88,0x88,0x88,0x88,0x88,0x70},{0x88,0x88,0x88,0x88,0x88,0x50,0x20},{0x88,0x88,0x88,0x88,0xA8,0xD8,0x88},{0x88,0x88,0x50,0x20,0x50,0x88,0x88},{0x88,0x88,0x50,0x20,0x20,0x20,0x20},{0xF8,0x08,0x10,0x20,0x40,0x80,0xF8},{0x70,0x40,0x40,0x40,0x40,0x40,0x70},{0x00,0x80,0x40,0x20,0x10,0x08,0x00},{0x70,0x10,0x10,0x10,0x10,0x10,0x70},{0x20,0x70,0xA8,0x20,0x20,0x20,0x00},{0x00,0x20,0x40,0xF8,0x40,0x20,0x00},{0x00,0x20,0x20,0x20,0xA8,0x70,0x20},{0x00,0x20,0x10,0xF8,0x10,0x20,0x00},{0x00,0x88,0x50,0x20,0x50,0x88,0x00},{0x00,0x20,0x00,0xF8,0x00,0x20,0x00}};
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const char SMLFONT[HICHAR-LOCHAR+1][5] = {/*{count:68,w:5,h:5,brev:1}*/
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{ 0x00,0x00,0x00,0x00,0x00 },{ 0x40,0x40,0x00,0x40,0x00 },{ 0xA0,0xA0,0x00,0x00,0x00 },{ 0x60,0xF0,0xF0,0x60,0x00 },{ 0x40,0xE0,0xE0,0x40,0x00 },{ 0x90,0x20,0x40,0x90,0x00 },{ 0xC0,0xB0,0xE0,0xD0,0x00 },{ 0x20,0x40,0x00,0x00,0x00 },{ 0x20,0x40,0x40,0x20,0x00 },{ 0x40,0x20,0x20,0x40,0x00 },{ 0x40,0xE0,0x40,0xA0,0x00 },{ 0x00,0x40,0xE0,0x40,0x00 },{ 0x00,0x00,0x00,0x60,0x20 },{ 0x00,0x00,0xE0,0x00,0x00 },{ 0x00,0x00,0x00,0x40,0x00 },{ 0x20,0x20,0x40,0x40,0x00 },{ 0xE0,0xA0,0xA0,0xA0,0xE0 },{ 0xC0,0x40,0x40,0x40,0xE0 },{ 0xE0,0x20,0xE0,0x80,0xE0 },{ 0xE0,0x20,0x60,0x20,0xE0 },{ 0xA0,0xA0,0xE0,0x20,0x20 },{ 0xE0,0x80,0xE0,0x20,0xE0 },{ 0xE0,0x80,0xE0,0xA0,0xE0 },{ 0xE0,0x20,0x40,0x40,0x40 },{ 0xE0,0xA0,0xE0,0xA0,0xE0 },{ 0xE0,0xA0,0xE0,0x20,0xE0 },{ 0x00,0x40,0x00,0x40,0x00 },{ 0x00,0x40,0x00,0x60,0x20 },{ 0x00,0x20,0x40,0x20,0x00 },{ 0x00,0xE0,0x00,0xE0,0x00 },{ 0x00,0x40,0x20,0x40,0x00 },{ 0xE0,0x20,0x60,0x00,0x40 },{ 0xF0,0x90,0x10,0xD0,0xF0 },{ 0x60,0xA0,0xE0,0xA0,0x00 },{ 0xC0,0xE0,0xA0,0xE0,0x00 },{ 0x60,0x80,0x80,0xE0,0x00 },{ 0xC0,0xA0,0xA0,0xC0,0x00 },{ 0xE0,0xC0,0x80,0xE0,0x00 },{ 0xE0,0xC0,0x80,0x80,0x00 },{ 0x60,0x80,0xA0,0xE0,0x00 },{ 0xA0,0xA0,0xE0,0xA0,0x00 },{ 0xE0,0x40,0x40,0xE0,0x00 },{ 0x60,0x20,0xA0,0xE0,0x00 },{ 0xA0,0xC0,0xC0,0xA0,0x00 },{ 0x80,0x80,0x80,0xE0,0x00 },{ 0xE0,0xE0,0xE0,0xA0,0x00 },{ 0xE0,0xA0,0xA0,0xA0,0x00 },{ 0xE0,0xA0,0xA0,0xE0,0x00 },{ 0xE0,0xA0,0xE0,0x80,0x00 },{ 0xE0,0xA0,0xE0,0xF0,0x00 },{ 0xE0,0xA0,0xC0,0xA0,0x00 },{ 0xE0,0x80,0x60,0xE0,0x00 },{ 0xE0,0x40,0x40,0x40,0x00 },{ 0xA0,0xA0,0xA0,0xE0,0x00 },{ 0xA0,0xA0,0xC0,0x80,0x00 },{ 0xA0,0xE0,0xE0,0xE0,0x00 },{ 0xA0,0x40,0xA0,0xA0,0x00 },{ 0xA0,0xE0,0x40,0x40,0x00 },{ 0xE0,0x20,0x40,0xE0,0x00 },{ 0x60,0x40,0x40,0x60,0x00 },{ 0x40,0x40,0x20,0x20,0x00 },{ 0x60,0x20,0x20,0x60,0x00 },{ 0x40,0xA0,0x00,0x00,0x00 },{ 0x00,0x00,0x00,0x00,0xF0 },{ 0x80,0x40,0x00,0x00,0x00 },{ 0x00,0x60,0xA0,0xE0,0x00 },{ 0x80,0xE0,0xA0,0xE0,0x00 },{ 0x00,0x60,0x80,0xE0,0x00 }};
|
|
|
|
// draw a letter
|
|
byte draw_char(const FontDescriptor* font, byte ch, byte x, byte y, byte op) {
|
|
const byte* src = font->chartab + (ch-font->base_ch)*font->pattern_y;
|
|
byte* dest = &vmagic[y][x>>2];// destination address
|
|
byte magic = M_SHIFT(x) | M_XPAND | (op & 0x30);
|
|
// big sizes?
|
|
if (op & 0xc0) {
|
|
char buf[8]; // expansion buffer
|
|
char* mbuf = (buf - 0x4000);// make it magic
|
|
byte sc = 1 << (op >> 6); // 2x2 = 2, 4x4 = 4, 8x8 = 8
|
|
for (byte i=0; i<font->pattern_y; i++) {
|
|
// expand into magic buffer onto stack
|
|
hw_magic = M_XPAND;
|
|
hw_xpand = 0b1100; // on = 11, off = 00
|
|
// 2x2 size
|
|
mbuf[1] = mbuf[0] = *src++;
|
|
// 4x4 size
|
|
if (op & 0x80) {
|
|
byte b = buf[0];
|
|
mbuf[3] = mbuf[2] = buf[1];
|
|
mbuf[1] = mbuf[0] = b;
|
|
}
|
|
// 8x8 size
|
|
if ((op & 0xc0) == 0xc0) {
|
|
byte b = buf[0];
|
|
mbuf[7] = mbuf[6] = buf[3];
|
|
mbuf[5] = mbuf[4] = buf[2];
|
|
mbuf[3] = mbuf[2] = buf[1];
|
|
mbuf[1] = mbuf[0] = b;
|
|
}
|
|
// draw to screen (magic, again)
|
|
hw_xpand = op & 0xf;
|
|
for (byte j=0; j<sc; j++) {
|
|
hw_magic = magic; // reset flip flop
|
|
EXIT_CLIPDEST(dest);
|
|
for (byte k=0; k<sc; k++) {
|
|
byte b = buf[k];
|
|
*dest++ = b;
|
|
*dest++ = b;
|
|
}
|
|
dest += VBWIDTH-sc*2;
|
|
}
|
|
}
|
|
} else {
|
|
hw_xpand = op & 0xf;
|
|
for (byte i=0; i<font->pattern_y; i++) {
|
|
char b = *src++;
|
|
EXIT_CLIPDEST(dest);
|
|
hw_magic = magic; // reset flip flop
|
|
*dest++ = b; // expand lower nibble -> 1st byte
|
|
*dest++ = b; // expand upper nibble -> 2nd byte
|
|
*dest++ = 0; // leftover -> 3rd byte
|
|
dest += VBWIDTH-3; // we incremented 3 bytes for this line
|
|
}
|
|
}
|
|
return font->frame_x << (op >> 6);
|
|
}
|
|
|
|
#define FONT_IX ((const FontDescriptor*)ctx->regs.w.ix)
|
|
|
|
void draw_string(ContextBlock *ctx, const char* str, byte x, byte y, byte op) {
|
|
do {
|
|
byte ch = *str++;
|
|
if (!ch) {
|
|
_E = x;
|
|
break;
|
|
}
|
|
if (ch < 0x20) {
|
|
x += draw_char(&FNTSYS, ' ', x, y, op); // TODO
|
|
} else if (ch < 0x64) {
|
|
x += draw_char(&FNTSYS, ch, x, y, op);
|
|
} else if (ch >= 0x80) {
|
|
x += draw_char(FONT_IX, ch, x, y, op);
|
|
} else {
|
|
/*
|
|
if (ch & 0x10) {
|
|
ctx->regs.b.ixl = *str++;
|
|
ctx->regs.b.ixh = *str++;
|
|
}
|
|
if (ch & 0x1)
|
|
_E = *str++;
|
|
if (ch & 0x2)
|
|
_D = *str++;
|
|
if (ch & 0x4)
|
|
_C = *str++;
|
|
*/
|
|
// TODO: only can change font
|
|
}
|
|
} while (1);
|
|
}
|
|
|
|
// String display routine (pass pointer to string)
|
|
void STRDIS2(ContextBlock *ctx, char *str) {
|
|
byte opts = _C;
|
|
byte x = _E;
|
|
byte y = _D;
|
|
void* fontdesc = (void*) ctx->regs.w.ix;
|
|
draw_string(ctx, str, x, y, opts); // TODO: opts
|
|
}
|
|
|
|
// String display routine
|
|
void STRDIS(ContextBlock *ctx) {
|
|
char* str = (char*) _HL;
|
|
STRDIS2(ctx, str);
|
|
}
|
|
|
|
// Character display routine
|
|
void CHRDIS(ContextBlock *ctx) {
|
|
char chstr[2];
|
|
chstr[0] = _A;
|
|
chstr[1] = 0;
|
|
STRDIS2(ctx, chstr);
|
|
}
|
|
|
|
// BCD routine
|
|
const char BCDTAB[17] = "0123456789*+,-./";
|
|
|
|
// DISNUM - (E.D) x/y (C) options (B) ext (HL) BCD-addr
|
|
void DISNUM(ContextBlock *ctx) {
|
|
// TODO: options, B
|
|
byte x = _E;
|
|
byte y = _D;
|
|
byte opt = _C;
|
|
byte ext = _B;
|
|
byte ndigits = ext & 63;
|
|
const FontDescriptor* font = (ext&64) ? &FNTSML : &FNTSYS;
|
|
byte add = (ext&64) ? 128 : 0;
|
|
byte noleadingzero = ext & 128;
|
|
byte* pbcd = (byte*) _HL;
|
|
pbcd += (ndigits-1)/2;
|
|
while (ndigits--) {
|
|
byte val = *pbcd;
|
|
if (ndigits & 1) {
|
|
val >>= 4;
|
|
} else {
|
|
val &= 15;
|
|
pbcd--;
|
|
}
|
|
x += draw_char(font, BCDTAB[val]+add, x, y, opt);
|
|
}
|
|
}
|
|
|
|
typedef struct {
|
|
sbyte xofs, yofs;
|
|
byte xsize, ysize;
|
|
byte pattern[0];
|
|
} PatternBlock;
|
|
|
|
// write pattern (E,D,C,B) magic A @ HL
|
|
void WRIT(ContextBlock *ctx) {
|
|
byte x = _E;
|
|
byte y = _D;
|
|
byte w = _C;
|
|
byte h = _B;
|
|
byte* src = (byte*) _HL;
|
|
byte* dest = &vmagic[y][x>>2];// destination address
|
|
byte i,j;
|
|
byte magic = _A;
|
|
for (j=0; j<h; j++) {
|
|
EXIT_CLIPDEST(dest);
|
|
if ((hw_magic = magic) & M_XPAND) {
|
|
for (i=0; i<w; i++) {
|
|
byte b = *src++;
|
|
*dest++ = b;
|
|
*dest++ = b;
|
|
}
|
|
*dest = 0;
|
|
dest += VBWIDTH-w*2;
|
|
} else {
|
|
for (i=0; i<w; i++) {
|
|
*dest++ = *src++;
|
|
}
|
|
*dest = 0;
|
|
dest += VBWIDTH-w;
|
|
}
|
|
}
|
|
}
|
|
|
|
// write sized pattern (E,D) magic A @ HL
|
|
void WRITP(ContextBlock *ctx) {
|
|
byte* src = (byte*) _HL;
|
|
// get size
|
|
_C = *src++;
|
|
_B = *src++;
|
|
// update src
|
|
_HL = (word) src;
|
|
WRIT(ctx);
|
|
}
|
|
|
|
// write relative pattern (E,D) magic A @ HL
|
|
void WRITR(ContextBlock *ctx) {
|
|
byte* src = (byte*) _HL;
|
|
// sub offset
|
|
_E -= *src++;
|
|
_D -= *src++;
|
|
// update src
|
|
_HL = (word) src;
|
|
WRITP(ctx);
|
|
}
|
|
|
|
void wait_vsync() {
|
|
byte x = TMR60;
|
|
while (x == TMR60) ; // wait until timer/60 changes
|
|
}
|
|
|
|
void PAWS(ContextBlock *ctx) {
|
|
while (_B--) {
|
|
wait_vsync();
|
|
}
|
|
}
|
|
|
|
// MATH
|
|
|
|
void MOVE(ContextBlock *ctx) {
|
|
byte* dest = (byte*) _DE;
|
|
const byte* src = (const byte*) _HL;
|
|
word nb = _BC;
|
|
memcpy(dest, src, nb);
|
|
}
|
|
|
|
word bcdadd8(byte a, byte b, byte c) {
|
|
a;b;c;
|
|
__asm
|
|
ld a,6(ix) ; carry
|
|
rrc a ; set carry bit
|
|
ld h,#0 ; carry goes here
|
|
ld a,4(ix) ; a -> A
|
|
adc a,5(ix) ; a + b -> A
|
|
daa ; BCD conversion
|
|
ld l,a ; result -> L
|
|
rl h ; carry -> H
|
|
__endasm;
|
|
}
|
|
|
|
void BCDADD(ContextBlock *ctx) {
|
|
byte* dest = (byte*) _DE;
|
|
const byte* src = (const byte*) _HL;
|
|
byte n = _B;
|
|
byte carry = 0;
|
|
while (n--) {
|
|
byte a = *src++;
|
|
byte b = *dest;
|
|
word r = bcdadd8(a,b,carry);
|
|
carry = (r>>8);
|
|
*dest++ = r;
|
|
}
|
|
}
|
|
|
|
void RANGED(ContextBlock *ctx) {
|
|
/* Algorithm "xor" from p. 4 of Marsaglia, "Xorshift RNGs" */
|
|
RANSHT ^= RANSHT << 13;
|
|
RANSHT ^= RANSHT >> 17;
|
|
RANSHT ^= RANSHT << 5;
|
|
if (_A == 0) {
|
|
_A = (byte)RANSHT;
|
|
} else {
|
|
_A = (byte)(RANSHT % _A);
|
|
}
|
|
}
|
|
|
|
const SysCallEntry SYSCALL_TABLE[64] = {
|
|
/* 0 */
|
|
{ &INTPC, 0 },
|
|
{ &EXIT, 0 },
|
|
{ &RCALL, REG_HL },
|
|
{ &MCALL, REG_HL },
|
|
{ &MRET, 0 },
|
|
/* 10 */
|
|
{ &MJUMP, REG_HL },
|
|
{ &SUCK, REG_B },
|
|
{ &ACTINT, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
/* 20 */
|
|
{ 0, 0 },
|
|
{ &SETOUT, REG_D|REG_B|REG_A },
|
|
{ &COLSET, REG_HL },
|
|
{ &FILL, REG_A|REG_BC|REG_DE },
|
|
{ &RECTAN, REG_A|REG_B|REG_C|REG_D|REG_E },
|
|
/* 30 */
|
|
{ /*&VWRITR*/0, 0 },
|
|
{ &WRITR, REG_E|REG_D|REG_A|REG_HL },
|
|
{ &WRITP, REG_E|REG_D|REG_A|REG_HL },
|
|
{ &WRIT, REG_E|REG_D|REG_C|REG_B|REG_A|REG_HL },
|
|
{ /*&WRITA*/0, 0 },
|
|
/* 40 */
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
/* 50 */
|
|
{ &CHRDIS, REG_E|REG_D|REG_C|REG_A },
|
|
{ &STRDIS, REG_E|REG_D|REG_C|REG_HL },
|
|
{ &DISNUM, REG_E|REG_D|REG_C|REG_B|REG_HL },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
/* 60 */
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
/* 70 */
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
/* 80 */
|
|
{ &PAWS, REG_B },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
/* 90 */
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ &MOVE, REG_DE|REG_BC|REG_HL },
|
|
{ 0, 0 },
|
|
{ &BCDADD, REG_DE|REG_B|REG_HL },
|
|
/* 100 */
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
/* 110 */
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ &RANGED, REG_A },
|
|
/* 120 */
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
{ 0, 0 },
|
|
};
|
|
|
|
void SYSCALL(ContextBlock *ctx) {
|
|
byte op = *ctx->params++;
|
|
byte argmask;
|
|
SysRoutine* routine;
|
|
// user-defined?
|
|
if (op & 0x80) {
|
|
argmask = UMARGT[op>>1];
|
|
routine = (SysRoutine*) USERTB[op>>1];
|
|
} else {
|
|
const SysCallEntry* entry = &SYSCALL_TABLE[op>>1];
|
|
argmask = entry->argmask;
|
|
routine = entry->routine;
|
|
}
|
|
// suck params into context block?
|
|
if (op & 1) {
|
|
suckParams(ctx, argmask);
|
|
}
|
|
// call the routine
|
|
if (routine) {
|
|
routine(ctx);
|
|
}
|
|
}
|
|
|
|
void bios_init() {
|
|
memset((void*)0x4fce, 0, 0x5000-0x4fce);
|
|
ACTINT(0);
|
|
hw_verbl = 96*2;
|
|
hw_horcb = 41;
|
|
hw_inmod = 0x8;
|
|
// clear shifter
|
|
hw_magic = 0;
|
|
*((byte*)0x4fce) = 0;
|
|
hw_magic = 0;
|
|
}
|
|
|
|
#ifdef TEST
|
|
|
|
void _main() {
|
|
__asm
|
|
#include "astrocade.inc"
|
|
#include "test3.s"
|
|
__endasm;
|
|
}
|
|
|
|
#else
|
|
|
|
void _biosend() __naked {
|
|
__asm
|
|
; eat up rest of space
|
|
.ds 0x2000 - (. - __biosend)
|
|
__endasm;
|
|
}
|
|
|
|
#endif
|