95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
#ifndef _COMMON_H
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#define _COMMON_H
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <peekpoke.h>
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#include <string.h>
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#include <c64.h>
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#ifdef __CC65__
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#include <conio.h>
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#include <joystick.h>
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#endif
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typedef uint8_t byte; // 8-bit unsigned
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typedef int8_t sbyte; // 8-bit signed
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typedef uint16_t word; // 16-bit unsigned
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typedef enum { false, true } bool; // boolean
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#define COLS 40 // total # of columns
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#define ROWS 25 // total # of rows
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///// MACROS /////
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// lookup screen address macro
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#define SCRNADR(base,col,row) ((base)+(col)+(row)*40)
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// default screen base address on startup
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#define DEFAULT_SCREEN ((void*)0x400)
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// wait until next frame, same as waitvsync()
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#define wait_vblank waitvsync
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// is raster line > 255?
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#define RASTER_HIBIT (VIC.ctrl1 & 0x80)
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// set VIC Bank (given the start address)
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#define SET_VIC_BANK(_addr) \
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CIA2.pra = (CIA2.pra & ~3) | (((((_addr)>>8)&0xc0)>>6)^3);
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// set VIC character memory (given the start address)
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#define SET_VIC_BITMAP(_addr) \
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VIC.addr = (VIC.addr & 0b11110001) | ((((_addr)>>8)&0x38)>>2);
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// set VIC screen memory (given the start address)
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#define SET_VIC_SCREEN(_addr) \
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VIC.addr = (VIC.addr & 0b00001111) | ((((_addr)>>8)&0x3c)<<2);
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// set scrolling registers
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#define SET_SCROLL_Y(_y) \
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VIC.ctrl1 = (VIC.ctrl1 & 0xf8) | (_y);
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#define SET_SCROLL_X(_x) \
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VIC.ctrl2 = (VIC.ctrl2 & 0xf8) | (_x);
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// enable RAM from 0xa000-0xffff, disable interrupts
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#define ENABLE_HIMEM() \
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asm("php"); \
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asm("sei"); \
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POKE(1, PEEK(1) & ~0b111);
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// enable ROM and interrupts
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#define DISABLE_HIMEM() \
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POKE(1, PEEK(1) | 0b111); \
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asm("plp");
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///// FUNCTIONS /////
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// wait until specific raster line
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void raster_wait(byte line);
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// get current VIC bank start address
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char* get_vic_bank_start();
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// get current screen memory address
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char* get_screen_memory();
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#ifdef __CC65__
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// return key in buffer, or 0 if none (BIOS call)
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char __fastcall__ poll_keyboard();
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#endif
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#ifndef __CC65__
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inline void clrscr() {
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__asm__ volatile ("jsr $E544" : : : "a","x","y"); // regs clobbered
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}
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inline void waitvsync() {
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raster_wait(255);
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}
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#endif
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#endif
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