mirror of
https://github.com/sehugg/8bitworkshop.git
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266 lines
7.5 KiB
C
266 lines
7.5 KiB
C
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#ifndef _VCSLIB_H
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#define _VCSLIB_H
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#include <atari2600.h>
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#include <stdint.h>
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// Define data types for different data sizes and signedness
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typedef unsigned char byte; // 8-bit unsigned data type
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typedef signed char sbyte; // 8-bit signed data type
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typedef unsigned short word; // 16-bit unsigned data type
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typedef signed short sword; // 16-bit signed data type
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// Bank switching functions that will be called directly when needed
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// These are for changing which section of ROM or RAM the Atari 2600 accesses
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// Select a ROM bank by index
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extern void fastcall bankselect(byte bankindex);
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// Select a RAM bank by index
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extern void fastcall ramselect(byte ramindex);
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// Set address in extended RAM
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extern void fastcall xramset(void* address);
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// Write a byte to extended RAM at set address
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extern void fastcall xramwrite(byte value);
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// Read a byte from extended RAM at set address
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extern byte fastcall xramread(void);
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// Copies initialized data from ROM to RAM at startup, if used
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extern void copyxdata(void);
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// Atari 2600 kernel helpers, called in a sequence every frame
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extern void kernel_1(void); // before preframe
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extern void kernel_2(void); // before kernel
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extern void kernel_3(void); // after kernel
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extern void kernel_4(void); // after postframe
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// Function to set horizontal position of a game object.
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// The position and object index are packed into a single int.
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// Hi byte = object index
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// Lo byte = X coordinate
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extern void fastcall set_horiz_pos(int hi_obj__lo_xpos);
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// Waits for next scanline start
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#define do_wsync() asm("sta $42 ; WSYNC");
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// Applies horizontal motion to sprite(s) after set_horiz_pos()
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#define apply_hmove() \
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asm("sta $42 ; WSYNC"); \
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asm("sta $6a ; HMOVE");
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/**** SCOREBOARD ROUTINES ****/
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// Add 4-digit BCD to 6-digit BCD score
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extern void fastcall score6_add(int delta_bcd);
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#pragma wrapped-call (push, bankselect, bank)
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// Setup TIA for Playfield score display
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extern void scorepf_build(void);
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// Kernel for Playfield score display
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extern void scorepf_kernel(void);
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#pragma wrapped-call (pop)
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/**** SOUND AND MUSIC ROUTINES ****/
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#pragma wrapped-call (push, bankselect, bank)
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// Update sound playback (once per frame)
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extern void sound_update();
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// Play a specific sound
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extern void sound_play(byte sndindex);
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// Update music playback
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extern void music_update();
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#pragma wrapped-call (pop)
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extern const byte* music_ptr; // Pointer to current music data
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#pragma zpsym("music_ptr");
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// Macro to set music data pointer and begin playback
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#define music_play(ptr) music_ptr = (ptr);
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extern byte sndchan_timer[2]; // sound channel timers, 0 = free channel
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#pragma zpsym("sndchan_timer");
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extern byte sndchan_sfx[2]; // sound channel sound index
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#pragma zpsym("sndchan_sfx");
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/**** 48-PIXEL BITMAP ROUTINES ****/
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// Setup TIA for 48-pixel wide bitmap mode
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extern void fastcall bitmap48_setup();
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#pragma wrapped-call (push, ramselect, 0)
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// Draws a 48-pixel wide bitmap
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extern void fastcall bitmap48_kernel(unsigned char nlines);
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// Sets height for bitmap48_setaddress() function
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extern void fastcall bitmap48_setheight(byte height);
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// Sets address of 48-pixel bitmap data
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// Bitmap should be 6 bytes wide
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extern void fastcall bitmap48_setaddress(byte* bitmap);
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// Builds a 6-digit score display in XRAM
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extern void fastcall score6_build();
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#pragma wrapped-call (pop)
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#pragma wrapped-call (push, bankselect, bank)
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// Create 48-pixel font from string (requires tinyfont48.c)
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extern void tinyfont48_build(byte* dest, const char str[12]);
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#pragma wrapped-call (pop)
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/////
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#define P0 0
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#define P1 1
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#define M0 2
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#define M1 3
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#define BALL 4
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#define OBJ_PLAYER_0 0x000
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#define OBJ_PLAYER_1 0x100
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#define OBJ_MISSILE_0 0x200
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#define OBJ_MISSILE_1 0x300
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#define OBJ_BALL 0x400
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#define SW_RESET() ((RIOT.swchb & RESET_MASK) == 0)
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#define SW_SELECT() ((RIOT.swchb & SELECT_MASK) == 0)
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#define SW_COLOR() ((RIOT.swchb & BW_MASK) != 0)
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#define SW_P0_PRO() ((RIOT.swchb & P0_DIFF_MASK) != 0)
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#define SW_P1_PRO() ((RIOT.swchb & P1_DIFF_MASK) != 0)
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#define COLOR_CONV(color) (SW_COLOR() ? color : color & 0x0f)
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#define _CYCLES(lines) (((lines) * 76) - 13)
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#define _TIM64(cycles) (((cycles) >> 6) - (((cycles) & 63) < 12))
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#define _T1024(cycles) ((cycles) >> 10)
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#ifdef PAL
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#define VBLANK_TIM64 _TIM64(_CYCLES(45))
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#define KERNAL_T1024 _T1024(_CYCLES(250))
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#define OVERSCAN_TIM64 _TIM64(_CYCLES(36))
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#else
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#define VBLANK_TIM64 _TIM64(_CYCLES(37))
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#define KERNAL_TIM64 _TIM64(_CYCLES(198))
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#define OVERSCAN_TIM64 _TIM64(_CYCLES(28))
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#endif
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#define JOY_UP(plyr) (!(RIOT.swcha & ((plyr) ? 0x1 : ~MOVE_UP)))
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#define JOY_DOWN(plyr) (!(RIOT.swcha & ((plyr) ? 0x2 : ~MOVE_DOWN)))
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#define JOY_LEFT(plyr) (!(RIOT.swcha & ((plyr) ? 0x4 : ~MOVE_LEFT)))
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#define JOY_RIGHT(plyr) (!(RIOT.swcha & ((plyr) ? 0x8 : ~MOVE_RIGHT)))
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#define JOY_FIRE(plyr) !(((plyr) ? TIA.inpt5 : TIA.inpt4) & 0x80)
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// TIA - CONSTANTS
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#define HMOVE_L7 (0x70)
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#define HMOVE_L6 (0x60)
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#define HMOVE_L5 (0x50)
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#define HMOVE_L4 (0x40)
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#define HMOVE_L3 (0x30)
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#define HMOVE_L2 (0x20)
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#define HMOVE_L1 (0x10)
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#define HMOVE_0 (0x00)
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#define HMOVE_R1 (0xF0)
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#define HMOVE_R2 (0xE0)
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#define HMOVE_R3 (0xD0)
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#define HMOVE_R4 (0xC0)
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#define HMOVE_R5 (0xB0)
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#define HMOVE_R6 (0xA0)
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#define HMOVE_R7 (0x90)
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#define HMOVE_R8 (0x80)
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// Values for ENAMx and ENABL
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#define DISABLE_BM (0b00)
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#define ENABLE_BM (0b10)
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// Values for RESMPx
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#define LOCK_MISSILE (0b10)
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#define UNLOCK_MISSILE (0b00)
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// Values for REFPx
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#define NO_REFLECT (0b0000)
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#define REFLECT (0b1000)
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// Values for NUSIZx
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#define ONE_COPY (0b000)
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#define TWO_COPIES (0b001)
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#define TWO_MED_COPIES (0b010)
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#define THREE_COPIES (0b011)
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#define TWO_WIDE_COPIES (0b100)
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#define DOUBLE_SIZE (0b101)
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#define THREE_MED_COPIES (0b110)
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#define QUAD_SIZE (0b111)
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#define MSBL_SIZE1 (0b000000)
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#define MSBL_SIZE2 (0b010000)
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#define MSBL_SIZE4 (0b100000)
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#define MSBL_SIZE8 (0b110000)
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// Values for CTRLPF
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#define PF_PRIORITY (0b100)
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#define PF_SCORE (0b10)
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#define PF_REFLECT (0b01)
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#define PF_NO_REFLECT (0b00)
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// Values for SWCHB
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#define P1_DIFF_MASK (0b10000000)
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#define P0_DIFF_MASK (0b01000000)
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#define BW_MASK (0b00001000)
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#define SELECT_MASK (0b00000010)
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#define RESET_MASK (0b00000001)
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#define VERTICAL_DELAY (1)
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// SWCHA joystick bits
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#define MOVE_RIGHT (0b01111111)
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#define MOVE_LEFT (0b10111111)
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#define MOVE_DOWN (0b11011111)
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#define MOVE_UP (0b11101111)
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#define P0_JOYSTICK_MASK (0b11110000)
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#define P1_JOYSTICK_MASK (0b00001111)
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#define P0_NO_MOVE (P0_JOYSTICK_MASK)
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#define P1_NO_MOVE (P1_JOYSTICK_MASK)
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#define NO_MOVE (P0_NO_MOVE | P1_NO_MOVE)
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#define P0_HORIZ_MOVE (MOVE_RIGHT & MOVE_LEFT & P0_NO_MOVE)
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#define P0_VERT_MOVE (MOVE_UP & MOVE_DOWN & P0_NO_MOVE)
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#define P1_HORIZ_MOVE (((MOVE_RIGHT & MOVE_LEFT) >> 4) & P1_NO_MOVE)
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#define P1_VERT_MOVE (((MOVE_UP & MOVE_DOWN) >> 4) & P1_NO_MOVE)
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// SWCHA paddle bits
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#define P0_TRIGGER_PRESSED (0b01111111)
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#define P1_TRIGGER_PRESSED (0b10111111)
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#define P2_TRIGGER_PRESSED (0b11110111)
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#define P3_TRIGGER_PRESSED (0b11111011)
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// Values for VBLANK
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#define DUMP_PORTS (0b10000000)
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#define ENABLE_LATCHES (0b01000000)
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#define DISABLE_TIA (0b00000010)
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#define ENABLE_TIA (0b00000000)
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// Values for VSYNC
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#define START_VERT_SYNC (0b10)
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#define STOP_VERT_SYNC (0b00)
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#endif
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