/***************************************************************************
Amiga hardware
Driver by: Ernesto Corvi, Mariusz Wojcieszek, Aaron Giles
***************************************************************************/
#include "emu.h"
#include "includes/amiga.h"
/*************************************
*
* Macros
*
*************************************/
#define COPPER_CYCLES_TO_PIXELS(x) (4 * (x))
/*************************************
*
* Tables
*
*************************************/
/* expand an 8-bit bit pattern into 16 bits, every other bit */
const UINT16 amiga_expand_byte[256] =
{
0x0000, 0x0001, 0x0004, 0x0005, 0x0010, 0x0011, 0x0014, 0x0015,
0x0040, 0x0041, 0x0044, 0x0045, 0x0050, 0x0051, 0x0054, 0x0055,
0x0100, 0x0101, 0x0104, 0x0105, 0x0110, 0x0111, 0x0114, 0x0115,
0x0140, 0x0141, 0x0144, 0x0145, 0x0150, 0x0151, 0x0154, 0x0155,
0x0400, 0x0401, 0x0404, 0x0405, 0x0410, 0x0411, 0x0414, 0x0415,
0x0440, 0x0441, 0x0444, 0x0445, 0x0450, 0x0451, 0x0454, 0x0455,
0x0500, 0x0501, 0x0504, 0x0505, 0x0510, 0x0511, 0x0514, 0x0515,
0x0540, 0x0541, 0x0544, 0x0545, 0x0550, 0x0551, 0x0554, 0x0555,
0x1000, 0x1001, 0x1004, 0x1005, 0x1010, 0x1011, 0x1014, 0x1015,
0x1040, 0x1041, 0x1044, 0x1045, 0x1050, 0x1051, 0x1054, 0x1055,
0x1100, 0x1101, 0x1104, 0x1105, 0x1110, 0x1111, 0x1114, 0x1115,
0x1140, 0x1141, 0x1144, 0x1145, 0x1150, 0x1151, 0x1154, 0x1155,
0x1400, 0x1401, 0x1404, 0x1405, 0x1410, 0x1411, 0x1414, 0x1415,
0x1440, 0x1441, 0x1444, 0x1445, 0x1450, 0x1451, 0x1454, 0x1455,
0x1500, 0x1501, 0x1504, 0x1505, 0x1510, 0x1511, 0x1514, 0x1515,
0x1540, 0x1541, 0x1544, 0x1545, 0x1550, 0x1551, 0x1554, 0x1555,
0x4000, 0x4001, 0x4004, 0x4005, 0x4010, 0x4011, 0x4014, 0x4015,
0x4040, 0x4041, 0x4044, 0x4045, 0x4050, 0x4051, 0x4054, 0x4055,
0x4100, 0x4101, 0x4104, 0x4105, 0x4110, 0x4111, 0x4114, 0x4115,
0x4140, 0x4141, 0x4144, 0x4145, 0x4150, 0x4151, 0x4154, 0x4155,
0x4400, 0x4401, 0x4404, 0x4405, 0x4410, 0x4411, 0x4414, 0x4415,
0x4440, 0x4441, 0x4444, 0x4445, 0x4450, 0x4451, 0x4454, 0x4455,
0x4500, 0x4501, 0x4504, 0x4505, 0x4510, 0x4511, 0x4514, 0x4515,
0x4540, 0x4541, 0x4544, 0x4545, 0x4550, 0x4551, 0x4554, 0x4555,
0x5000, 0x5001, 0x5004, 0x5005, 0x5010, 0x5011, 0x5014, 0x5015,
0x5040, 0x5041, 0x5044, 0x5045, 0x5050, 0x5051, 0x5054, 0x5055,
0x5100, 0x5101, 0x5104, 0x5105, 0x5110, 0x5111, 0x5114, 0x5115,
0x5140, 0x5141, 0x5144, 0x5145, 0x5150, 0x5151, 0x5154, 0x5155,
0x5400, 0x5401, 0x5404, 0x5405, 0x5410, 0x5411, 0x5414, 0x5415,
0x5440, 0x5441, 0x5444, 0x5445, 0x5450, 0x5451, 0x5454, 0x5455,
0x5500, 0x5501, 0x5504, 0x5505, 0x5510, 0x5511, 0x5514, 0x5515,
0x5540, 0x5541, 0x5544, 0x5545, 0x5550, 0x5551, 0x5554, 0x5555
};
const UINT16 delay[256] =
{
1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,1,0,0,0,0,0,0,0,0, /* 0x000 - 0x03e */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x040 - 0x05e */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x060 - 0x07e */
0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0, /* 0x080 - 0x09e */
1,1,0,0,0,0,0,0,1,1,0,0,0,0,0,0,1,1,0,0,0,0,0,0,1,1,0,0,0,0,0,0, /* 0x0a0 - 0x0de */
/* BPLxPTH/BPLxPTL */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x0e0 - 0x0fe */
/* BPLCON0-3,BPLMOD1-2 */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x100 - 0x11e */
/* SPRxPTH/SPRxPTL */
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* 0x120 - 0x13e */
/* SPRxPOS/SPRxCTL/SPRxDATA/SPRxDATB */
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* 0x140 - 0x17e */
/* COLORxx */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x180 - 0x1be */
/* RESERVED */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 /* 0x1c0 - 0x1fe */
};
/*************************************
*
* 4-4-4 palette init
*
*************************************/
PALETTE_INIT( amiga )
{
int i;
for (i = 0; i < 0x1000; i++)
palette_set_color_rgb(machine, i, pal4bit(i >> 8), pal4bit(i >> 4), pal4bit(i));
}
/*************************************
*
* Video startup
*
*************************************/
VIDEO_START( amiga )
{
amiga_state *state = machine.driver_data<amiga_state>();
int j;
/* generate tables that produce the correct playfield color for dual playfield mode */
for (j = 0; j < 64; j++)
{
int pf1pix = ((j >> 0) & 1) | ((j >> 1) & 2) | ((j >> 2) & 4);
int pf2pix = ((j >> 1) & 1) | ((j >> 2) & 2) | ((j >> 3) & 4);
state->m_separate_bitplanes[0][j] = (pf1pix || !pf2pix) ? pf1pix : (pf2pix + 8);
state->m_separate_bitplanes[1][j] = pf2pix ? (pf2pix + 8) : pf1pix;
}
#if GUESS_COPPER_OFFSET
state->m_wait_offset = 3;
#endif
/* reset the genlock color */
state->m_genlock_color = 0xffff;
state->m_sprite_ctl_written = 0;
}
/*************************************
*
* Beam position
*
*************************************/
UINT32 amiga_gethvpos(screen_device &screen)
{
amiga_state *state = screen.machine().driver_data<amiga_state>();
UINT32 hvpos = (state->m_last_scanline << 8) | (screen.hpos() >> 2);
UINT32 latchedpos = input_port_read_safe(screen.machine(), "HVPOS", 0);
/* if there's no latched position, or if we are in the active display area */
/* but before the latching point, return the live HV position */
if ((CUSTOM_REG(REG_BPLCON0) & 0x0008) == 0 || latchedpos == 0 || (state->m_last_scanline >= 20 && hvpos < latchedpos))
return hvpos;
/* otherwise, return the latched position */
return latchedpos;
}
/*************************************
*
* Genlock interaction
*
*************************************/
void amiga_set_genlock_color(running_machine &machine, UINT16 color)
{
amiga_state *state = machine.driver_data<amiga_state>();
state->m_genlock_color = color;
}
/*************************************
*
* Copper emulation
*
*************************************/
void amiga_copper_setpc(running_machine &machine, UINT32 pc)
{
amiga_state *state = machine.driver_data<amiga_state>();
if (LOG_COPPER)
logerror("copper_setpc(%06x)\n", pc);
state->m_copper_pc = pc;
state->m_copper_waiting = FALSE;
}
int amiga_copper_execute_next(running_machine &machine, int xpos)
{
amiga_state *state = machine.driver_data<amiga_state>();
int word0, word1;
/* bail if not enabled */
if ((CUSTOM_REG(REG_DMACON) & (DMACON_COPEN | DMACON_DMAEN)) != (DMACON_COPEN | DMACON_DMAEN))
return 511;
/* flush any pending writes */
if (state->m_copper_pending_offset)
{
if (LOG_COPPER)
logerror("%02X.%02X: Write to %s = %04x\n", state->m_last_scanline, xpos / 2, amiga_custom_names[state->m_copper_pending_offset & 0xff], state->m_copper_pending_data);
amiga_custom_w(machine.device("maincpu")->memory().space(AS_PROGRAM), state->m_copper_pending_offset, state->m_copper_pending_data, 0xffff);
state->m_copper_pending_offset = 0;
}
/* if we're waiting, check for a breakthrough */
if (state->m_copper_waiting)
{
int curpos = (state->m_last_scanline << 8) | (xpos >> 1);
/* if we're past the wait time, stop it and hold up 2 cycles */
if ((curpos & state->m_copper_waitmask) >= (state->m_copper_waitval & state->m_copper_waitmask) &&
(!state->m_copper_waitblit || !(CUSTOM_REG(REG_DMACON) & DMACON_BBUSY)))
{
state->m_copper_waiting = FALSE;
#if GUESS_COPPER_OFFSET
return xpos + COPPER_CYCLES_TO_PIXELS(1 + state->m_wait_offset);
#else
return xpos + COPPER_CYCLES_TO_PIXELS(1 + 3);
#endif
}
/* otherwise, see if this line is even a possibility; if not, punt */
if (((curpos | 0xff) & state->m_copper_waitmask) < (state->m_copper_waitval & state->m_copper_waitmask))
return 511;
/* else just advance another pixel */
xpos += COPPER_CYCLES_TO_PIXELS(1);
return xpos;
}
/* fetch the first data word */
word0 = (*state->m_chip_ram_r)(state, state->m_copper_pc);
state->m_copper_pc += 2;
xpos += COPPER_CYCLES_TO_PIXELS(1);
/* fetch the second data word */
word1 = (*state->m_chip_ram_r)(state, state->m_copper_pc);
state->m_copper_pc += 2;
xpos += COPPER_CYCLES_TO_PIXELS(1);
if (LOG_COPPER)
logerror("%02X.%02X: Copper inst @ %06x = %04x %04x\n", state->m_last_scanline, xpos / 2, state->m_copper_pc, word0, word1);
/* handle a move */
if ((word0 & 1) == 0)
{
int min = (CUSTOM_REG(REG_COPCON) & 2) ? 0x20 : 0x40;
/* do the write if we're allowed */
word0 = (word0 >> 1) & 0xff;
if (word0 >= min)
{
if (delay[word0] == 0)
{
if (LOG_COPPER)
logerror("%02X.%02X: Write to %s = %04x\n", state->m_last_scanline, xpos / 2, amiga_custom_names[word0 & 0xff], word1);
amiga_custom_w(machine.device("maincpu")->memory().space(AS_PROGRAM), word0, word1, 0xffff);
}
else // additional 2 cycles needed for non-Agnus registers
{
state->m_copper_pending_offset = word0;
state->m_copper_pending_data = word1;
}
}
/* illegal writes suspend until next frame */
else
{
if (LOG_COPPER)
logerror("%02X.%02X: Aborting copper on illegal write\n", state->m_last_scanline, xpos / 2);
state->m_copper_waitval = 0xffff;
state->m_copper_waitmask = 0xffff;
state->m_copper_waitblit = FALSE;
state->m_copper_waiting = TRUE;
return 511;
}
}
else
{
/* extract common wait/skip values */
state->m_copper_waitval = word0 & 0xfffe;
state->m_copper_waitmask = word1 | 0x8001;
state->m_copper_waitblit = (~word1 >> 15) & 1;
/* handle a wait */
if ((word1 & 1) == 0)
{
if (LOG_COPPER)
logerror(" Waiting for %04x & %04x (currently %04x)\n", state->m_copper_waitval, state->m_copper_waitmask, (state->m_last_scanline << 8) | (xpos >> 1));
state->m_copper_waiting = TRUE;
}
/* handle a skip */
else
{
int curpos = (state->m_last_scanline << 8) | (xpos >> 1);
if (LOG_COPPER)
logerror(" Skipping if %04x & %04x (currently %04x)\n", state->m_copper_waitval, state->m_copper_waitmask, (state->m_last_scanline << 8) | (xpos >> 1));
/* if we're past the wait time, stop it and hold up 2 cycles */
if ((curpos & state->m_copper_waitmask) >= (state->m_copper_waitval & state->m_copper_waitmask) &&
(!state->m_copper_waitblit || !(CUSTOM_REG(REG_DMACON) & DMACON_BBUSY)))
{
if (LOG_COPPER)
logerror(" Skipped\n");
/* count the cycles it out have taken to fetch the next instruction */
state->m_copper_pc += 4;
xpos += COPPER_CYCLES_TO_PIXELS(2);
}
}
}
/* advance and consume 8 cycles */
return xpos;
}
/*************************************
*
* External sprite controls
*
*************************************/
void amiga_sprite_dma_reset(running_machine &machine, int which)
{
amiga_state *state = machine.driver_data<amiga_state>();
if (LOG_SPRITE_DMA) logerror("sprite %d dma reset\n", which );
state->m_sprite_dma_reload_mask |= 1 << which;
state->m_sprite_dma_live_mask |= 1 << which;
}
void amiga_sprite_enable_comparitor(running_machine &machine, int which, int enable)
{
amiga_state *state = machine.driver_data<amiga_state>();
if (LOG_SPRITE_DMA) logerror("sprite %d comparitor %sable\n", which, enable ? "en" : "dis" );
if (enable)
{
state->m_sprite_comparitor_enable_mask |= 1 << which;
state->m_sprite_dma_live_mask &= ~(1 << which);
}
else
{
state->m_sprite_comparitor_enable_mask &= ~(1 << which);
state->m_sprite_ctl_written |= (1 << which);
}
}
/*************************************
*
* Per-scanline sprite fetcher
*
*************************************/
INLINE void fetch_sprite_data(amiga_state *state, int scanline, int sprite)
{
CUSTOM_REG(REG_SPR0DATA + 4 * sprite) = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0);
CUSTOM_REG(REG_SPR0DATB + 4 * sprite) = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2);
CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4;
if (LOG_SPRITE_DMA) logerror("%3d:sprite %d fetch: data=%04X-%04X\n", scanline, sprite, CUSTOM_REG(REG_SPR0DATA + 4 * sprite), CUSTOM_REG(REG_SPR0DATB + 4 * sprite));
}
static void update_sprite_dma(amiga_state *state, int scanline)
{
int dmaenable = (CUSTOM_REG(REG_DMACON) & (DMACON_SPREN | DMACON_DMAEN)) == (DMACON_SPREN | DMACON_DMAEN);
int num, maxdma;
/* channels are limited by DDFSTART */
maxdma = (CUSTOM_REG(REG_DDFSTRT) - 0x14) / 4;
if (maxdma > 8)
maxdma = 8;
/* loop over sprite channels */
for (num = 0; num < maxdma; num++)
{
int bitmask = 1 << num;
int vstart, vstop;
/* if we are == VSTOP, fetch new control words */
if (dmaenable && (state->m_sprite_dma_live_mask & bitmask) && (state->m_sprite_dma_reload_mask & bitmask))
{
/* disable the sprite */
state->m_sprite_comparitor_enable_mask &= ~bitmask;
state->m_sprite_dma_reload_mask &= ~bitmask;
/* fetch data into the control words */
CUSTOM_REG(REG_SPR0POS + 4 * num) = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) + 0);
CUSTOM_REG(REG_SPR0CTL + 4 * num) = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) + 2);
CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) += 4;
if (LOG_SPRITE_DMA) logerror("%3d:sprite %d fetch: pos=%04X ctl=%04X\n", scanline, num, CUSTOM_REG(REG_SPR0POS + 4 * num), CUSTOM_REG(REG_SPR0CTL + 4 * num));
}
/* compute vstart/vstop */
vstart = (CUSTOM_REG(REG_SPR0POS + 4 * num) >> 8) | ((CUSTOM_REG(REG_SPR0CTL + 4 * num) << 6) & 0x100);
vstop = (CUSTOM_REG(REG_SPR0CTL + 4 * num) >> 8) | ((CUSTOM_REG(REG_SPR0CTL + 4 * num) << 7) & 0x100);
/* if we hit vstart, enable the comparitor */
if (scanline == vstart)
{
state->m_sprite_comparitor_enable_mask |= 1 << num;
if (LOG_SPRITE_DMA) logerror("%3d:sprite %d comparitor enable\n", scanline, num);
}
/* if we hit vstop, disable the comparitor and trigger a reload for the next scanline */
if (scanline == vstop)
{
state->m_sprite_ctl_written &= ~bitmask;
state->m_sprite_comparitor_enable_mask &= ~bitmask;
state->m_sprite_dma_reload_mask |= 1 << num;
CUSTOM_REG(REG_SPR0DATA + 4 * num) = 0; /* just a guess */
CUSTOM_REG(REG_SPR0DATB + 4 * num) = 0;
if (LOG_SPRITE_DMA) logerror("%3d:sprite %d comparitor disable, prepare for reload\n", scanline, num);
}
/* fetch data if this sprite is enabled */
if (dmaenable && (state->m_sprite_dma_live_mask & bitmask) && (state->m_sprite_comparitor_enable_mask & bitmask))
{
fetch_sprite_data(state, scanline, num);
}
}
}
/*************************************
*
* Per-pixel sprite computations
*
*************************************/
INLINE UINT32 interleave_sprite_data(UINT16 lobits, UINT16 hibits)
{
return (amiga_expand_byte[lobits & 0xff] << 0) | (amiga_expand_byte[lobits >> 8] << 16) |
(amiga_expand_byte[hibits & 0xff] << 1) | (amiga_expand_byte[hibits >> 8] << 17);
}
static int get_sprite_pixel(amiga_state *state, int x)
{
int pixels = 0;
int num, pair;
/* loop over sprite channels */
for (num = 0; num < 8; num++)
if (state->m_sprite_comparitor_enable_mask & (1 << num))
{
/* if we're not currently clocking, check against hstart */
if (state->m_sprite_remain[num] == 0)
{
int hstart = ((CUSTOM_REG(REG_SPR0POS + 4 * num) & 0xff) << 1) | (CUSTOM_REG(REG_SPR0CTL + 4 * num) & 1);
if (hstart == x)
{
state->m_sprite_remain[num] = 16;
state->m_sprite_shiftreg[num] = interleave_sprite_data(CUSTOM_REG(REG_SPR0DATA + 4 * num), CUSTOM_REG(REG_SPR0DATB + 4 * num));
}
}
/* clock the next pixel if we're doing it */
if (state->m_sprite_remain[num] != 0)
{
state->m_sprite_remain[num]--;
pixels |= (state->m_sprite_shiftreg[num] & 0xc0000000) >> (16 + 2 * (7 - num));
state->m_sprite_shiftreg[num] <<= 2;
}
}
/* if we have pixels, determine the actual color and get out */
if (pixels)
{
static const UINT16 ormask[16] =
{
0x0000, 0x000c, 0x00c0, 0x00cc, 0x0c00, 0x0c0c, 0x0cc0, 0x0ccc,
0xc000, 0xc00c, 0xc0c0, 0xc0cc, 0xcc00, 0xcc0c, 0xccc0, 0xcccc
};
static const UINT16 spritecollide[16] =
{
0x0000, 0x0000, 0x0000, 0x0200, 0x0000, 0x0400, 0x1000, 0x1600,
0x0000, 0x0800, 0x2000, 0x2a00, 0x4000, 0x4c00, 0x7000, 0x7e00
};
int collide;
const int esprm = 0x10, osprm = 0x10;
/* OR the two sprite bits together so we only have 1 bit per sprite */
collide = pixels | (pixels >> 1);
/* based on the CLXCON, merge even/odd sprite results */
collide |= (collide & ormask[CUSTOM_REG(REG_CLXCON) >> 12]) >> 2;
/* collapse down to a 4-bit final "sprite present" mask */
collide = (collide & 1) | ((collide >> 3) & 2) | ((collide >> 6) & 4) | ((collide >> 9) & 8);
/* compute sprite-sprite collisions */
CUSTOM_REG(REG_CLXDAT) |= spritecollide[collide];
/* now determine the actual color */
for (pair = 0; pixels; pair++, pixels >>= 4)
if (pixels & 0x0f)
{
/* final result is:
topmost sprite color in bits 0-5
sprite present bitmask in bits 6-9
topmost sprite pair index in bits 10-11
*/
UINT32 result = (collide << 6) | (pair << 10);
/* attached case */
if (CUSTOM_REG(REG_SPR1CTL + 8 * pair) & 0x0080)
return (pixels & 0xf) | osprm | result;
/* lower-numbered sprite of pair */
else if (pixels & 3)
return (pixels & 3) | esprm | (pair << 2) | result;
/* higher-numbered sprite of pair */
else
return ((pixels >> 2) & 3) | osprm | (pair << 2) | result;
}
}
return 0;
}
/*************************************
*
* Bitplane assembly
*
*************************************/
INLINE UINT8 assemble_odd_bitplanes(amiga_state *state, int planes, int obitoffs)
{
UINT8 pix = (CUSTOM_REG(REG_BPL1DAT) >> obitoffs) & 1;
if (planes >= 3)
{
pix |= ((CUSTOM_REG(REG_BPL3DAT) >> obitoffs) & 1) << 2;
if (planes >= 5)
pix |= ((CUSTOM_REG(REG_BPL5DAT) >> obitoffs) & 1) << 4;
}
return pix;
}
INLINE UINT8 assemble_even_bitplanes(amiga_state *state, int planes, int ebitoffs)
{
UINT8 pix = 0;
if (planes >= 2)
{
pix |= ((CUSTOM_REG(REG_BPL2DAT) >> ebitoffs) & 1) << 1;
if (planes >= 4)
{
pix |= ((CUSTOM_REG(REG_BPL4DAT) >> ebitoffs) & 1) << 3;
if (planes >= 6)
pix |= ((CUSTOM_REG(REG_BPL6DAT) >> ebitoffs) & 1) << 5;
}
}
return pix;
}
INLINE void fetch_bitplane_data(amiga_state *state, int plane)
{
CUSTOM_REG(REG_BPL1DAT + plane) = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2));
CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2;
}
/*************************************
*
* Hold and modify pixel computations
*
*************************************/
INLINE int update_ham(amiga_state *state, int newpix)
{
switch (newpix >> 4)
{
case 0:
state->m_ham_color = CUSTOM_REG(REG_COLOR00 + (newpix & 0xf));
break;
case 1:
state->m_ham_color = (state->m_ham_color & 0xff0) | ((newpix & 0xf) << 0);
break;
case 2:
state->m_ham_color = (state->m_ham_color & 0x0ff) | ((newpix & 0xf) << 8);
break;
case 3:
state->m_ham_color = (state->m_ham_color & 0xf0f) | ((newpix & 0xf) << 4);
break;
}
return state->m_ham_color;
}
/*************************************
*
* Single scanline rasterizer
*
*************************************/
void amiga_render_scanline(running_machine &machine, bitmap_t *bitmap, int scanline)
{
amiga_state *state = machine.driver_data<amiga_state>();
UINT16 save_color0 = CUSTOM_REG(REG_COLOR00);
int ddf_start_pixel = 0, ddf_stop_pixel = 0;
int hires = 0, dualpf = 0, ham = 0;
int hstart = 0, hstop = 0;
int vstart = 0, vstop = 0;
int pf1pri = 0, pf2pri = 0;
int planes = 0;
int x;
UINT16 *dst = NULL;
int ebitoffs = 0, obitoffs = 0;
int ecolmask = 0, ocolmask = 0;
int edelay = 0, odelay = 0;
int next_copper_x;
int pl;
const int defbitoffs = 15;
state->m_last_scanline = scanline;
/* on the first scanline, reset the COPPER and HAM color */
if (scanline == 0)
{
amiga_copper_setpc(machine, CUSTOM_REG_LONG(REG_COP1LCH));
state->m_ham_color = CUSTOM_REG(REG_COLOR00);
}
/* update sprite data fetching */
update_sprite_dma(state, scanline);
/* start of a new line, signal we're not done with it and fill up vars */
if (bitmap != NULL)
dst = BITMAP_ADDR16(bitmap, scanline, 0);
/* all sprites off at the start of the line */
memset(state->m_sprite_remain, 0, sizeof(state->m_sprite_remain));
/* temporary set color 0 to the genlock color */
if (state->m_genlock_color != 0xffff)
CUSTOM_REG(REG_COLOR00) = state->m_genlock_color;
/* loop over the line */
next_copper_x = 0;
for (x = 0; x < 0xe4*2; x++)
{
int sprpix;
/* time to execute the copper? */
if (x == next_copper_x)
{
/* execute the next batch, restoring and re-saving color 0 around it */
CUSTOM_REG(REG_COLOR00) = save_color0;
next_copper_x = amiga_copper_execute_next(machine, x);
save_color0 = CUSTOM_REG(REG_COLOR00);
if (state->m_genlock_color != 0xffff)
CUSTOM_REG(REG_COLOR00) = state->m_genlock_color;
/* compute update-related register values */
planes = (CUSTOM_REG(REG_BPLCON0) & (BPLCON0_BPU0 | BPLCON0_BPU1 | BPLCON0_BPU2)) >> 12;
hires = CUSTOM_REG(REG_BPLCON0) & BPLCON0_HIRES;
ham = CUSTOM_REG(REG_BPLCON0) & BPLCON0_HOMOD;
dualpf = CUSTOM_REG(REG_BPLCON0) & BPLCON0_DBLPF;
// lace = CUSTOM_REG(REG_BPLCON0) & BPLCON0_LACE;
/* compute the pixel fetch parameters */
ddf_start_pixel = ( CUSTOM_REG(REG_DDFSTRT) & 0xfc ) * 2 + (hires ? 9 : 17);
ddf_stop_pixel = ( CUSTOM_REG(REG_DDFSTOP) & 0xfc ) * 2 + (hires ? (9 + defbitoffs) : (17 + defbitoffs));
if ( ( CUSTOM_REG(REG_DDFSTRT) ^ CUSTOM_REG(REG_DDFSTOP) ) & 0x04 )
ddf_stop_pixel += 8;
/* compute the horizontal start/stop */
hstart = CUSTOM_REG(REG_DIWSTRT) & 0xff;
hstop = (CUSTOM_REG(REG_DIWSTOP) & 0xff);
hstop |= 0x100;
/* compute the vertical start/stop */
vstart = CUSTOM_REG(REG_DIWSTRT) >> 8;
vstop = (CUSTOM_REG(REG_DIWSTOP) >> 8);
vstop |= ((~CUSTOM_REG(REG_DIWSTOP) >> 7) & 0x100);
/* extract playfield priorities */
pf1pri = CUSTOM_REG(REG_BPLCON2) & 7;
pf2pri = (CUSTOM_REG(REG_BPLCON2) >> 3) & 7;
/* extract collision masks */
ocolmask = (CUSTOM_REG(REG_CLXCON) >> 6) & 0x15;
ecolmask = (CUSTOM_REG(REG_CLXCON) >> 6) & 0x2a;
}
/* clear the target pixels to the background color as a starting point */
if (dst != NULL)
dst[x*2+0] =
dst[x*2+1] = CUSTOM_REG(REG_COLOR00);
/* if we hit the first fetch pixel, reset the counters and latch the delays */
if (x == ddf_start_pixel)
{
odelay = CUSTOM_REG(REG_BPLCON1) & 0xf;
edelay = ( CUSTOM_REG(REG_BPLCON1) >> 4 ) & 0x0f;
if ( hires )
{
obitoffs = defbitoffs + ( odelay << 1 );
ebitoffs = defbitoffs + ( edelay << 1 );
}
else
{
if ( CUSTOM_REG(REG_DDFSTRT) & 0x04 )
{
odelay = ( odelay + 8 ) & 0x0f;
edelay = ( edelay + 8 ) & 0x0f;
}
obitoffs = defbitoffs + odelay;
ebitoffs = defbitoffs + edelay;
}
for (pl = 0; pl < 6; pl++)
CUSTOM_REG(REG_BPL1DAT + pl) = 0;
}
/* need to run the sprite engine every pixel to ensure display */
sprpix = get_sprite_pixel(state, x);
/* to render, we must have bitplane DMA enabled, at least 1 plane, and be within the */
/* vertical display window */
if ((CUSTOM_REG(REG_DMACON) & (DMACON_BPLEN | DMACON_DMAEN)) == (DMACON_BPLEN | DMACON_DMAEN) &&
planes > 0 && scanline >= vstart && scanline < vstop)
{
int pfpix0 = 0, pfpix1 = 0, collide;
/* fetch the odd bits if we are within the fetching region */
if (x >= ddf_start_pixel && x <= ddf_stop_pixel + odelay)
{
/* if we need to fetch more data, do it now */
if (obitoffs == defbitoffs)
{
for (pl = 0; pl < planes; pl += 2)
{
fetch_bitplane_data(state, pl);
}
}
/* now assemble the bits */
pfpix0 |= assemble_odd_bitplanes(state, planes, obitoffs);
obitoffs--;
/* for high res, assemble a second set of bits */
if (hires)
{
/* reset bit offsets and fetch more data if needed */
if (obitoffs < 0)
{
obitoffs = defbitoffs;
for (pl = 0; pl < planes; pl += 2)
{
fetch_bitplane_data(state, pl);
}
}
pfpix1 |= assemble_odd_bitplanes(state, planes, obitoffs);
obitoffs--;
}
else
pfpix1 |= pfpix0 & 0x15;
/* reset bit offsets if needed */
if (obitoffs < 0)
obitoffs = defbitoffs;
}
/* fetch the even bits if we are within the fetching region */
if (x >= ddf_start_pixel && x <= ddf_stop_pixel + edelay)
{
/* if we need to fetch more data, do it now */
if (ebitoffs == defbitoffs)
{
for (pl = 1; pl < planes; pl += 2)
{
fetch_bitplane_data(state, pl);
}
}
/* now assemble the bits */
pfpix0 |= assemble_even_bitplanes(state, planes, ebitoffs);
ebitoffs--;
/* for high res, assemble a second set of bits */
if (hires)
{
/* reset bit offsets and fetch more data if needed */
if (ebitoffs < 0)
{
ebitoffs = defbitoffs;
for (pl = 1; pl < planes; pl += 2)
{
fetch_bitplane_data(state, pl);
}
}
pfpix1 |= assemble_even_bitplanes(state, planes, ebitoffs);
ebitoffs--;
}
else
pfpix1 |= pfpix0 & 0x2a;
/* reset bit offsets if needed */
if (ebitoffs < 0)
ebitoffs = defbitoffs;
}
/* compute playfield/sprite collisions for first pixel */
collide = pfpix0 ^ CUSTOM_REG(REG_CLXCON);
if ((collide & ocolmask) == 0)
CUSTOM_REG(REG_CLXDAT) |= (sprpix >> 5) & 0x01e;
if ((collide & ecolmask) == 0)
CUSTOM_REG(REG_CLXDAT) |= (sprpix >> 1) & 0x1e0;
if ((collide & (ecolmask | ocolmask)) == 0)
CUSTOM_REG(REG_CLXDAT) |= 0x001;
/* compute playfield/sprite collisions for second pixel */
collide = pfpix1 ^ CUSTOM_REG(REG_CLXCON);
if ((collide & ocolmask) == 0)
CUSTOM_REG(REG_CLXDAT) |= (sprpix >> 5) & 0x01e;
if ((collide & ecolmask) == 0)
CUSTOM_REG(REG_CLXDAT) |= (sprpix >> 1) & 0x1e0;
if ((collide & (ecolmask | ocolmask)) == 0)
CUSTOM_REG(REG_CLXDAT) |= 0x001;
/* if we are within the display region, render */
if (dst != NULL && x >= hstart && x < hstop)
{
int pix, pri;
/* hold-and-modify mode -- assume low-res (hi-res not supported by the hardware) */
if (ham)
{
/* update the HAM color */
pfpix0 = update_ham(state, pfpix0);
pix = sprpix & 0x1f;
pri = (sprpix >> 10);
/* sprite has priority */
if (sprpix && pf1pri > pri)
{
dst[x*2+0] =
dst[x*2+1] = CUSTOM_REG(REG_COLOR00 + pix);
}
/* playfield has priority */
else
{
dst[x*2+0] =
dst[x*2+1] = pfpix0;
}
}
/* dual playfield mode */
else if (dualpf)
{
/* mask out the sprite if it doesn't have priority */
pix = sprpix & 0x1f;
pri = (sprpix >> 10);
if (pix)
{
if ((pfpix0 & 0x15) && pf1pri <= pri)
pix = 0;
if ((pfpix0 & 0x2a) && pf2pri <= pri)
pix = 0;
}
/* write out the left pixel */
if (pix)
dst[x*2+0] = CUSTOM_REG(REG_COLOR00 + pix);
else
dst[x*2+0] = CUSTOM_REG(REG_COLOR00 + state->m_separate_bitplanes[(CUSTOM_REG(REG_BPLCON2) >> 6) & 1][pfpix0]);
/* mask out the sprite if it doesn't have priority */
pix = sprpix & 0x1f;
if (pix)
{
if ((pfpix1 & 0x15) && pf1pri <= pri)
pix = 0;
if ((pfpix1 & 0x2a) && pf2pri <= pri)
pix = 0;
}
/* write out the right pixel */
if (pix)
dst[x*2+1] = CUSTOM_REG(REG_COLOR00 + pix);
else
dst[x*2+1] = CUSTOM_REG(REG_COLOR00 + state->m_separate_bitplanes[(CUSTOM_REG(REG_BPLCON2) >> 6) & 1][pfpix1]);
}
/* single playfield mode */
else
{
pix = sprpix & 0x1f;
pri = (sprpix >> 10);
/* sprite has priority */
if (sprpix && pf1pri > pri)
{
dst[x*2+0] =
dst[x*2+1] = CUSTOM_REG(REG_COLOR00 + pix);
}
/* playfield has priority */
else
{
dst[x*2+0] = CUSTOM_REG(REG_COLOR00 + pfpix0);
dst[x*2+1] = CUSTOM_REG(REG_COLOR00 + pfpix1);
}
}
}
}
}
#if 0
if ( machine.primary_screen->frame_number() % 64 == 0 && scanline == 100 )
{
const char *m_lores = "LORES";
const char *m_hires = "HIRES";
const char *m_ham = "HAM";
const char *m_dualpf = "DUALPF";
const char *m_lace = "LACE";
const char *m_hilace = "HI-LACE";
const char *p = m_lores;
if ( hires ) p = m_hires;
if ( ham ) p = m_ham;
if ( dualpf ) p = m_dualpf;
if ( lace ) p = m_lace;
if ( hires && lace ) p = m_hilace;
popmessage("%s(%d pl od=%04x ed=%04x start=%04x stop=%04x)", p, planes, odelay, edelay, CUSTOM_REG(REG_DDFSTRT), CUSTOM_REG(REG_DDFSTOP) );
}
#endif
/* end of the line: time to add the modulos */
if (scanline >= vstart && scanline < vstop)
{
/* update odd planes */
for (pl = 0; pl < planes; pl += 2)
CUSTOM_REG_LONG(REG_BPL1PTH + pl * 2) += CUSTOM_REG_SIGNED(REG_BPL1MOD);
/* update even planes */
for (pl = 1; pl < planes; pl += 2)
CUSTOM_REG_LONG(REG_BPL1PTH + pl * 2) += CUSTOM_REG_SIGNED(REG_BPL2MOD);
}
/* restore color00 */
CUSTOM_REG(REG_COLOR00) = save_color0;
#if GUESS_COPPER_OFFSET
if (machine.primary_screen->frame_number() % 64 == 0 && scanline == 0)
{
if (machine.input().code_pressed(KEYCODE_Q))
popmessage("%d", state->m_wait_offset -= 1);
if (machine.input().code_pressed(KEYCODE_W))
popmessage("%d", state->m_wait_offset += 1);
}
#endif
}
/*************************************
*
* Update
*
*************************************/
SCREEN_UPDATE( amiga )
{
int y;
/* render each scanline in the visible region */
for (y = cliprect->min_y; y <= cliprect->max_y; y++)
amiga_render_scanline(screen->machine(), bitmap, y);
return 0;
}