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7f52a770d9
So far the joy_masks array allowed several joystick drivers for a single target to each have different joy_read return values. However this meant that every call to joy_read implied an additional joy_masks lookup to post-process the return value. Given that almost all targets only come with a single joystick driver this seems an inappropriate overhead. Therefore now the target header files contain constants matching the return value of the joy_read of the joystick driver(s) on that target. If there indeed are several joystick drivers for a single target they must agree on a common return value for joy_read. In some cases this was alredy the case as there's a "natural" return value for joy_read. However a few joystick drivers need to be adjusted. This may cause some overhead inside the driver. But that is for sure smaller than the overhead introduced by the joy_masks lookup before. !!! ToDo !!! The following three joystick drivers become broken with this commit and need to be adjusted: - atrmj8.s - c64-numpad.s - vic20-stdjoy.s
186 lines
6.6 KiB
C
186 lines
6.6 KiB
C
/*****************************************************************************/
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/* */
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/* nes.h */
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/* */
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/* NES system specific definitions */
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/* */
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/* */
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/* */
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/* (C) 2002-2003 Groepaz/Hitmen */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#ifndef _NES_H
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#define _NES_H
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/* Check for errors */
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#if !defined(__NES__)
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# error This module may only be used when compiling for the NES!
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#endif
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/* Key and character defines */
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#define CH_ENTER '\n'
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#define CH_CURS_UP 0x01
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#define CH_CURS_DOWN 0x02
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#define CH_CURS_LEFT 0x03
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#define CH_CURS_RIGHT 0x04
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#define CH_ESC 8
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#define CH_DEL 20
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#define CH_CROSS 0x10
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#define CH_RTEE 0x17
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#define CH_LTEE 0x0f
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#define CH_TTEE 0x16
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#define CH_BTEE 0x15
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#define CH_HLINE 0x0b
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#define CH_VLINE 0x0e
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#define CH_ULCORNER 0x14
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#define CH_URCORNER 0x12
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#define CH_LLCORNER 0x11
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#define CH_LRCORNER 0x08
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#define CH_PI 0x05
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/* Color defines */
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#define COLOR_BLACK 0x00
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#define COLOR_WHITE 0x01
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#define COLOR_RED 0x02
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#define COLOR_CYAN 0x03
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#define COLOR_VIOLET 0x04
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#define COLOR_GREEN 0x05
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#define COLOR_BLUE 0x06
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#define COLOR_YELLOW 0x07
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#define COLOR_ORANGE 0x08
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#define COLOR_BROWN 0x09
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#define COLOR_LIGHTRED 0x0A
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#define COLOR_GRAY1 0x0B
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#define COLOR_GRAY2 0x0C
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#define COLOR_LIGHTGREEN 0x0D
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#define COLOR_LIGHTBLUE 0x0E
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#define COLOR_GRAY3 0x0F
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/* Masks for joy_read */
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#define JOY_UP_MASK 0x10
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#define JOY_DOWN_MASK 0x20
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#define JOY_LEFT_MASK 0x40
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#define JOY_RIGHT_MASK 0x80
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#define JOY_BTN_1_MASK 0x01
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#define JOY_BTN_2_MASK 0x02
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#define JOY_BTN_3_MASK 0x04
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#define JOY_BTN_4_MASK 0x08
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#define JOY_BTN_A_MASK JOY_BTN_1_MASK
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#define JOY_BTN_B_MASK JOY_BTN_2_MASK
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#define JOY_SELECT_MASK JOY_BTN_3_MASK
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#define JOY_START_MASK JOY_BTN_4_MASK
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#define JOY_BTN_A(v) ((v) & JOY_BTN_A_MASK)
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#define JOY_BTN_B(v) ((v) & JOY_BTN_B_MASK)
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#define JOY_SELECT(v) ((v) & JOY_SELECT_MASK)
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#define JOY_START(v) ((v) & JOY_START_MASK)
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/* Return codes of get_tv */
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#define TV_NTSC 0
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#define TV_PAL 1
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#define TV_OTHER 2
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/* No support for dynamically loadable drivers */
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#define DYN_DRV 0
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/* Define hardware */
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/* Picture Processing Unit */
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struct __ppu {
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unsigned char control;
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unsigned char mask; /* color; show sprites, background */
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signed char volatile const status;
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struct {
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unsigned char address;
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unsigned char data;
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} sprite;
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unsigned char scroll;
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struct {
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unsigned char address;
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unsigned char data;
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} vram;
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};
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#define PPU (*(struct __ppu*)0x2000)
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#define SPRITE_DMA (APU.sprite.dma)
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/* Audio Processing Unit */
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struct __apu {
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struct {
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unsigned char control; /* duty, counter halt, volume/envelope */
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unsigned char ramp;
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unsigned char period_low; /* timing */
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unsigned char len_period_high; /* length, timing */
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} pulse[2];
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struct {
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unsigned char counter; /* counter halt, linear counter */
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unsigned char unused;
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unsigned char period_low; /* timing */
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unsigned char len_period_high; /* length, timing */
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} triangle;
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struct {
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unsigned char control; /* counter halt, volume/envelope */
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unsigned char unused;
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unsigned char period; /* loop, timing */
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unsigned char len; /* length */
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} noise;
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struct {
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unsigned char control; /* IRQ, loop, rate */
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unsigned char output; /* output value */
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unsigned char address;
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unsigned char length;
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} delta_mod; /* delta pulse-code modulation */
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struct {
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unsigned char dma;
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} sprite;
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signed char volatile status;
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unsigned char unused;
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unsigned char fcontrol;
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};
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#define APU (*(struct __apu*)0x4000)
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#define JOYPAD ((unsigned char volatile[2])0x4016)
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/* The addresses of the static drivers */
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extern void nes_stdjoy_joy[]; /* Referred to by joy_static_stddrv[] */
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extern void nes_64_56_2_tgi[]; /* Referred to by tgi_static_stddrv[] */
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void waitvsync (void);
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/* Wait for start of the next frame */
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unsigned char get_tv (void);
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/* Return the video mode the machine is using. */
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/* End of nes.h */
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#endif
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