mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-09 12:25:16 +01:00
cab4ecba99
* added an option to set VDP mode (PAL/NTSC) independently from console region. * added an option to select console master clock frequency (PAL/NTSC/AUTO): emulation now run at selected frequency when VSYNC is disabled. * added an option to force VSYNC disabled. * improved screen scaling. [Core] * moved INLINE definition to macros.h * removed unused typedef from osd_cpu.h * cleanup include files
235 lines
9.8 KiB
C
235 lines
9.8 KiB
C
/***************************************************************************************
|
|
* Genesis Plus
|
|
* Sega Light Phaser, Menacer & Konami Justifiers support
|
|
*
|
|
* Copyright (C) 2007-2011 Eke-Eke (Genesis Plus GX)
|
|
*
|
|
* Redistribution and use of this code or any derivative works are permitted
|
|
* provided that the following conditions are met:
|
|
*
|
|
* - Redistributions may not be sold, nor may they be used in a commercial
|
|
* product or activity.
|
|
*
|
|
* - Redistributions that are modified from the original source must include the
|
|
* complete source code, including the source code for all components used by a
|
|
* binary built from the modified sources. However, as a special exception, the
|
|
* source code distributed need not include anything that is normally distributed
|
|
* (in either source or binary form) with the major components (compiler, kernel,
|
|
* and so on) of the operating system on which the executable runs, unless that
|
|
* component itself accompanies the executable.
|
|
*
|
|
* - Redistributions must reproduce the above copyright notice, this list of
|
|
* conditions and the following disclaimer in the documentation and/or other
|
|
* materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************************/
|
|
|
|
#include "shared.h"
|
|
|
|
/************************************************************************************/
|
|
/* */
|
|
/* H-counter values returned in H40 & H32 modes */
|
|
/* */
|
|
/* Inside VDP, dot counter register is 9-bit, with only upper 8 bits being returned */
|
|
/* */
|
|
/* The number of dots per raster line is 342 in H32 mode and 420 in H40 mode */
|
|
/* */
|
|
/************************************************************************************/
|
|
|
|
static const uint8 hc_256[171] =
|
|
{
|
|
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
|
|
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
|
|
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
|
|
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
|
|
0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F,
|
|
0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F,
|
|
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
|
|
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, 0x7F,
|
|
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
|
|
0x90, 0x91, 0x92, 0x93,
|
|
0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
|
|
0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF
|
|
};
|
|
|
|
static const uint8 hc_320[210] =
|
|
{
|
|
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
|
|
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
|
|
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
|
|
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
|
|
0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F,
|
|
0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F,
|
|
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
|
|
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, 0x7F,
|
|
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
|
|
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F,
|
|
0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF,
|
|
0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6,
|
|
0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED,
|
|
0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD,
|
|
0xFE, 0xFF
|
|
};
|
|
|
|
static struct
|
|
{
|
|
uint8 State;
|
|
uint8 Port;
|
|
} lightgun;
|
|
|
|
|
|
void lightgun_reset(int port)
|
|
{
|
|
input.analog[port][0] = bitmap.viewport.w >> 1;
|
|
input.analog[port][1] = bitmap.viewport.h >> 1;
|
|
lightgun.State = 0x40;
|
|
lightgun.Port = 4;
|
|
}
|
|
|
|
void lightgun_refresh(int port)
|
|
{
|
|
/* Check that lightgun is enabled */
|
|
if (port == lightgun.Port)
|
|
{
|
|
/* check if line falls within current gun Y position */
|
|
if ((input.analog[port][1] == v_counter + input.y_offset))
|
|
{
|
|
/* HL enabled ? */
|
|
if (io_reg[5] & 0x80)
|
|
{
|
|
/* External Interrupt ? */
|
|
if (reg[11] & 0x08)
|
|
{
|
|
m68k_update_irq(2);
|
|
}
|
|
|
|
/* HV Counter Latch:
|
|
1) some games does not enable HVC latch but instead use bigger X offset
|
|
--> we force the HV counter value read by the gun routine
|
|
2) for games using H40 mode, the gun routine scales up the Hcounter value
|
|
--> H-Counter range is approx. 290 dot clocks
|
|
*/
|
|
hvc_latch = 0x10000 | (v_counter << 8);
|
|
if (reg[12] & 1)
|
|
{
|
|
hvc_latch |= hc_320[((input.analog[port][0] * 290) / (2 * 320) + input.x_offset) % 210];
|
|
}
|
|
else
|
|
{
|
|
hvc_latch |= hc_256[(input.analog[port][0] / 2 + input.x_offset) % 171];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
/* Sega Phaser */
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
INLINE unsigned char phaser_read(int port)
|
|
{
|
|
/* TL returns TRIGGER (INPUT_A) button status (active low) */
|
|
unsigned char temp = ~((input.pad[port] >> 2) & 0x10);
|
|
|
|
/* Check that TH is set as an input */
|
|
if (io_reg[0x0F] & (0x02 << (port >> 1)))
|
|
{
|
|
/* Get current X position (phaser is only used in MS compatiblity mode) */
|
|
int hcounter = hctab[(mcycles_z80 + SMS_CYCLE_OFFSET) % MCYCLES_PER_LINE];
|
|
|
|
/* Compare with gun position */
|
|
int dx = input.analog[port][0] - (hcounter << 1);
|
|
int dy = input.analog[port][1] - (v_counter);
|
|
|
|
/* Check if current pixel is within lightgun spot ? */
|
|
if ((abs(dy) <= 5) && (abs(dx) <= 60))
|
|
{
|
|
/* set TH low */
|
|
temp &= ~0x40;
|
|
|
|
/* prevents multiple latch at each port read */
|
|
if (lightgun.State)
|
|
{
|
|
/* latch estimated HC value */
|
|
hvc_latch = 0x10000 | (input.x_offset + (input.analog[port][0] >> 1));
|
|
lightgun.State = 0;
|
|
}
|
|
else
|
|
{
|
|
lightgun.State = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return temp & 0x7F;
|
|
}
|
|
|
|
unsigned char phaser_1_read(void)
|
|
{
|
|
return phaser_read(0);
|
|
}
|
|
|
|
unsigned char phaser_2_read(void)
|
|
{
|
|
return phaser_read(4);
|
|
}
|
|
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
/* Sega Menacer */
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
unsigned char menacer_read(void)
|
|
{
|
|
/* D0=??? (INPUT_B), D1=TRIGGER (INPUT_A), D2=??? (INPUT_C), D3= START (INPUT_START) (active high) */
|
|
/* TL & TR pins always return 0 (normally set as output) */
|
|
/* TH always return 1 (0 on active pixel but button acquisition is always done during VBLANK) */
|
|
unsigned data = input.pad[4] >> 4;
|
|
return ((data & 0x09) | ((data >> 1) & 0x02) | ((data << 1) & 0x04) | 0x40);
|
|
}
|
|
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
/* Konami Justifiers */
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
unsigned char justifier_read(void)
|
|
{
|
|
/* Gun detection */
|
|
if (lightgun.State & 0x40)
|
|
{
|
|
return 0x30;
|
|
}
|
|
|
|
/* Return TRIGGER (INPUT_A) & START (INPUT_START) button status in D0-D1 (active low) */
|
|
/* TL & TR pins should always return 1 (normally set as output) */
|
|
/* LEFT & RIGHT pins should always return 0 */
|
|
return (((~input.pad[lightgun.Port] >> 6) & 0x03) | 0x70);
|
|
}
|
|
|
|
void justifier_write(unsigned char data, unsigned char mask)
|
|
{
|
|
/* update bits set as output only, other bits are cleared (fixes Lethal Enforcers 2) */
|
|
data &= mask;
|
|
|
|
/* gun index */
|
|
lightgun.Port = 4 + ((data >> 5) & 1);
|
|
|
|
/* update internal state */
|
|
lightgun.State = data;
|
|
}
|