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Added #defines for GTIA register values

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Bill Kendrick 2019-01-13 01:57:21 -08:00 committed by GitHub
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1 changed files with 74 additions and 14 deletions
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include/_gtia.h
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@ -4,9 +4,16 @@
/* */
/* Internal include file, do not use directly */
/* */
/* "GTIA, Graphic Television Interface Adaptor, is a custom chip used in the */
/* Atari 8-bit family of computers and in the Atari 5200 console. In these */
/* systems, GTIA chip works together with ANTIC to produce video display. */
/* ANTIC generates the playfield graphics (text and bitmap) while GTIA */
/* provides the color for the playfield and adds overlay objects known as */
/* player/missile graphics (sprites)" - Wikipedia article on "GTIA" */
/* */
/* */
/* (C) 2000 Freddy Offenga <taf_offenga@yahoo.com> */
/* 2019-01-12: Bill Kendrick <nbs@sonic.net>: More defines for registers */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
@ -32,26 +39,33 @@
#ifndef __GTIA_H
#define __GTIA_H
/* Define a structure with the gtia register offsets */
/* Define a structure with the GTIA register offsets for write (W) */
struct __gtia_write {
unsigned char hposp0; /* 0x00: horizontal position player 0 */
unsigned char hposp1; /* 0x01: horizontal position player 1 */
unsigned char hposp2; /* 0x02: horizontal position player 2 */
unsigned char hposp3; /* 0x03: horizontal position player 3 */
unsigned char hposm0; /* 0x04: horizontal position missile 0 */
unsigned char hposm1; /* 0x05: horizontal position missile 1 */
unsigned char hposm2; /* 0x06: horizontal position missile 2 */
unsigned char hposm3; /* 0x07: horizontal position missile 3 */
unsigned char hposp0; /* 0x00: horizontal position of player 0 */
unsigned char hposp1; /* 0x01: horizontal position of player 1 */
unsigned char hposp2; /* 0x02: horizontal position of player 2 */
unsigned char hposp3; /* 0x03: horizontal position of player 3 */
unsigned char hposm0; /* 0x04: horizontal position of missile 0 */
unsigned char hposm1; /* 0x05: horizontal position of missile 1 */
unsigned char hposm2; /* 0x06: horizontal position of missile 2 */
unsigned char hposm3; /* 0x07: horizontal position of missile 3 */
unsigned char sizep0; /* 0x08: size of player 0 */
unsigned char sizep1; /* 0x09: size of player 1 */
unsigned char sizep2; /* 0x0A: size of player 2 */
unsigned char sizep3; /* 0x0B: size of player 3 */
unsigned char sizem; /* 0x0C: size of missiles */
unsigned char grafp0; /* 0x0D: graphics shape player 0 */
#define PMG_SIZE_NORMAL 0x0
#define PMG_SIZE_DOUBLE 0x1
#define PMG_SIZE_QUAD 0x2
unsigned char grafp0; /* 0x0D: graphics shape player 0 (used when ANTIC is not instructed to use DMA; see DMACTL) */
unsigned char grafp1; /* 0x0E: graphics shape player 1 */
unsigned char grafp2; /* 0x0F: graphics shape player 2 */
unsigned char grafp3; /* 0x10: graphics shape player 3 */
unsigned char grafm; /* 0x11: graphics shape missiles */
unsigned char colpm0; /* 0x12: color player and missile 0 */
unsigned char colpm1; /* 0x13: color player and missile 1 */
unsigned char colpm2; /* 0x14: color player and missile 2 */
@ -61,14 +75,47 @@ struct __gtia_write {
unsigned char colpf2; /* 0x18: color playfield 2 */
unsigned char colpf3; /* 0x19: color playfield 3 */
unsigned char colbk; /* 0x1A: color background */
/* See the "HUE_..." #defines in "atari.h" for the hue values to use with color registers, above */
/* Bitwise OR (|) with 0x00 (darkest) through 0x0F (lightest) (only even values are unique) */
unsigned char prior; /* 0x1B: priority selection */
unsigned char vdelay; /* 0x1C: vertical delay */
#define PRIOR_P03_PF03 0x01 /* Players 0-3, then Playfields 0-3, then background */
#define PRIOR_P01_PF03_P23 0x02 /* Players 0-1, then Playfields 0-3, then Players 2-3, then background */
#define PRIOR_PF03_P03 0x04 /* Playfields 0-3, then Players 0-3, then background */
#define PRIOR_PF01_P03_PF23 0x08 /* Playfields 0-1, then Players 0-3, then Playfields 2-3, then background */
#define PRIOR_5TH_PLAYER 0x10 /* Four missiles combine to be a 5th player (uses COLPF3) */
#define PRIOR_OVERLAP_3RD_COLOR 0x20 /* Overlap of players 0 and 1, and of players 2 and 3, results in a third color
(else overlap is black). The resulting color is a logical OR of the two player colors. */
#define PRIOR_GFX_MODE_9 0x40 /* 80x192 16 shade mode (shades of the background (COLBK) hue; brightness in COLBK cause additional effects) */
#define PRIOR_GFX_MODE_10 0x80 /* 80x192 9 color mode (COLPM0 (acts as background) thru COLPM3, followed by COLPF0 thru COLPF4) */
#define PRIOR_GFX_MODE_11 0xC0 /* 80x192 16 hue mode (hues of the background (COLBK) brightness) */
unsigned char vdelay; /* 0x1C: vertical delay (for one-line resolution movement of vertical position of an object when two line resolution display is enabled */
#define VDELAY_MISSILE0 0x01
#define VDELAY_MISSILE1 0x02
#define VDELAY_MISSILE2 0x04
#define VDELAY_MISSILE3 0x08
#define VDELAY_PLAYER0 0x10
#define VDELAY_PLAYER1 0x20
#define VDELAY_PLAYER2 0x40
#define VDELAY_PLAYER3 0x80
unsigned char gractl; /* 0x1D: stick/paddle latch, p/m control */
#define GRACTL_MISSLES 0x01 /* enable missiles */
#define GRACTL_PLAYERS 0x02 /* enable players */
#define GRACTL_LATCH_TRIGGER_INPUTS 0x04 /* "latch" triggers; once pressed, will give a continuous pressed input until this bit is cleared */
unsigned char hitclr; /* 0x1E: clear p/m collision */
unsigned char consol; /* 0x1F: builtin speaker */
};
/* Define a structure with the gtia register offsets */
/* Define a structure with the GTIA register offsets for read (R) */
struct __gtia_read {
unsigned char m0pf; /* 0x00: missile 0 to playfield collision */
unsigned char m1pf; /* 0x01: missile 1 to playfield collision */
@ -86,15 +133,28 @@ struct __gtia_read {
unsigned char p1pl; /* 0x0D: player 1 to player collision */
unsigned char p2pl; /* 0x0E: player 2 to player collision */
unsigned char p3pl; /* 0x0F: player 3 to player collision */
unsigned char trig0; /* 0x10: joystick trigger 0 */
unsigned char trig0; /* 0x10: joystick trigger 0 (0=pressed, 1=released) */
unsigned char trig1; /* 0x11: joystick trigger 1 */
unsigned char trig2; /* 0x12: joystick trigger 2 */
unsigned char trig3; /* 0x13: joystick trigger 3 */
unsigned char pal; /* 0x14: pal/ntsc flag */
#define TV_STD_PAL 0x1
#define TV_STD_NTSC 0xE
/* Note: This only tells you whether the GTIA is PAL or NTSC; some NTSC systems are modded with PAL ANTIC chips; testing VCOUNT limits can be done to check for that */
/* Note: Seems like it's not possible to test for SECAM */
unsigned char unused[10];
unsigned char consol; /* 0x1F: console buttons */
#define CONSOL_START(x) !((unsigned char)((x) & 1)) /* true if Start pressed */
#define CONSOL_SELECT(x) !((unsigned char)((x) & 2)) /* true if Select pressed */
#define CONSOL_OPTION(x) !((unsigned char)((x) & 4)) /* true if Option pressed */
};
/* End of _gtia.h */
#endif /* #ifndef __GTIA_H */