mirror of
https://github.com/sehugg/8bitworkshop.git
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145 lines
4.2 KiB
C
145 lines
4.2 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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// VIC Control Register 1 Flags
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#define VIC_CTRL1_RST8 0x80 // Bit 8 of RASTER (read) or raster line interrupt set (write)
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#define VIC_CTRL1_ECM 0x40 // Extended Color Mode
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#define VIC_CTRL1_BMM 0x20 // Bitmap Mode
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#define VIC_CTRL1_DEN 0x10 // Display Enable
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#define VIC_CTRL1_RSEL 0x08 // Row Select (25 or 24 rows)
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#define VIC_CTRL1_YSCROLL_MASK 0x07 // Vertical Fine Scrolling
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// VIC Control Register 2 Flags
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#define VIC_CTRL2_RES 0x20 // Chip reset
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#define VIC_CTRL2_MCM 0x10 // Multicolor Mode Enable
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#define VIC_CTRL2_CSEL 0x08 // Column Select (40 or 38 columns)
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#define VIC_CTRL2_XSCROLL_MASK 0x07 // Horizontal Fine Scrolling
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// VIC Memory Control Register Flags
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#define VIC_ADDR_VM_MASK 0xf0 // Video Matrix Base Address Mask (character data)
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#define VIC_ADDR_CB_MASK 0x0e // Character Bank Base Address Mask (screen memory)
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// VIC Interrupt Register Flags
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#define VIC_IRR_IRQ 0x80 // Interrupt Request
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#define VIC_IRR_ILP 0x08 // Light Pen Interrupt
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#define VIC_IRR_IMMC 0x04 // Sprite-Sprite Collision Interrupt
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#define VIC_IRR_IMBC 0x02 // Sprite-Background Collision Interrupt
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#define VIC_IRR_IRST 0x01 // Raster Line Interrupt
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// VIC Interrupt Mask Register Flags
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#define VIC_IMR_ELP 0x08 // Enable Light Pen Interrupt
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#define VIC_IMR_EMMC 0x04 // Enable Sprite-Sprite Collision Interrupt
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#define VIC_IMR_EMBC 0x02 // Enable Sprite-Background Collision Interrupt
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#define VIC_IMR_ERST 0x01 // Enable Raster Interrupt
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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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// 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 & 7);
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#define SET_SCROLL_X(_x) \
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VIC.ctrl2 = (VIC.ctrl2 & 0xf8) | (_x & 7);
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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) | 0b110); \
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asm("plp");
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// are we on a PAL system?
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#define IS_PAL() (PEEK(0x2a6) != 0)
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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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// wait until end of frame
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void wait_vblank();
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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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// read joystick fast
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#define READ_STICK(index) ~PEEK(0xdc01-(index))
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#define STICK_UP(joy) ((joy & 0x1) != 0)
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#define STICK_DOWN(joy) ((joy & 0x2) != 0)
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#define STICK_LEFT(joy) ((joy & 0x4) != 0)
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#define STICK_RIGHT(joy) ((joy & 0x8) != 0)
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#define STICK_BUTTON(joy) ((joy & 0x10) != 0)
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#define STICK_MOVED(joy) ((joy & 0x1f) != 0)
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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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// for use with set_irq()
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// sets up the VIC to send raster interrupts
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// and disables CIA interrupts
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void set_raster_irq(char scanline);
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#endif
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