/***************************************************************************
Amiga AGA hardware
Driver by: Ernesto Corvi, Mariusz Wojcieszek, Aaron Giles
Done:
- palette
- bitplane data fetching
- support for up to 8 standard bitplanes
- HAM8 mode
- preliminary sprites
To do:
- incorrect hstart/hstop values in CD32 logo, lsrquiz & lsrquiz2
- sprite collisions
***************************************************************************/
#include "emu.h"
#include "includes/amiga.h"
/*************************************
*
* Statics
*
*************************************/
/*************************************
*
* Palette
*
*************************************/
void amiga_aga_palette_write(running_machine &machine, int color_reg, UINT16 data)
{
amiga_state *state = machine.driver_data<amiga_state>();
pen_t *aga_palette = state->m_aga_palette;
int r,g,b;
int cr,cg,cb;
int color;
color = ((CUSTOM_REG(REG_BPLCON3) >> 13) & 0x07)*32 + color_reg;
r = (data & 0xf00) >> 8;
g = (data & 0x0f0) >> 4;
b = (data & 0x00f) >> 0;
cr = RGB_RED(aga_palette[color]);
cg = RGB_GREEN(aga_palette[color]);
cb = RGB_BLUE(aga_palette[color]);
if (BIT(CUSTOM_REG(REG_BPLCON3),9))
{
// load low nibbles
cr = (cr & 0xf0) | r;
cg = (cg & 0xf0) | g;
cb = (cb & 0xf0) | b;
}
else
{
cr = (r << 4) | r;
cg = (g << 4) | g;
cb = (b << 4) | b;
}
aga_palette[color] = MAKE_RGB(cr,cg,cb);
}
/*************************************
*
* Video startup
*
*************************************/
VIDEO_START( amiga_aga )
{
amiga_state *state = machine.driver_data<amiga_state>();
VIDEO_START_CALL( amiga );
state->m_aga_diwhigh_written = 0;
}
/*************************************
*
* Per-scanline sprite fetcher
*
*************************************/
INLINE void fetch_sprite_data(amiga_state *state, int scanline, int sprite)
{
switch((CUSTOM_REG(REG_FMODE) >> 2) & 0x03)
{
case 0:
state->m_aga_sprdata[sprite][0] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0);
state->m_aga_sprdatb[sprite][0] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2);
CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4;
state->m_aga_sprite_fetched_words = 1;
if (LOG_SPRITE_DMA) logerror("%3d:sprite %d fetch: data=%04X-%04X\n", scanline, sprite, state->m_aga_sprdata[sprite][0], state->m_aga_sprdatb[sprite][0]);
break;
case 1:
case 2:
state->m_aga_sprdata[sprite][0] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0);
state->m_aga_sprdata[sprite][1] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2);
CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4;
state->m_aga_sprdatb[sprite][0] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0);
state->m_aga_sprdatb[sprite][1] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2);
CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4;
state->m_aga_sprite_fetched_words = 2;
if (LOG_SPRITE_DMA) logerror("%3d:sprite %d fetch: data=%04X-%04X %04X-%04X\n", scanline, sprite, state->m_aga_sprdata[sprite][0], state->m_aga_sprdatb[sprite][0], state->m_aga_sprdata[sprite][1], state->m_aga_sprdatb[sprite][1] );
break;
case 3:
state->m_aga_sprdata[sprite][0] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0);
state->m_aga_sprdata[sprite][1] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2);
CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4;
state->m_aga_sprdata[sprite][2] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0);
state->m_aga_sprdata[sprite][3] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2);
CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4;
state->m_aga_sprdatb[sprite][0] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0);
state->m_aga_sprdatb[sprite][1] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2);
CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4;
state->m_aga_sprdatb[sprite][2] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0);
state->m_aga_sprdatb[sprite][3] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2);
CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4;
state->m_aga_sprite_fetched_words = 4;
if (LOG_SPRITE_DMA) logerror("%3d:sprite %d fetch: data=%04X-%04X %04X-%04X %04X-%04X %04X-%04X\n",
scanline, sprite,
state->m_aga_sprdata[sprite][0], state->m_aga_sprdatb[sprite][0],
state->m_aga_sprdata[sprite][1], state->m_aga_sprdatb[sprite][1],
state->m_aga_sprdata[sprite][2], state->m_aga_sprdatb[sprite][2],
state->m_aga_sprdata[sprite][3], state->m_aga_sprdatb[sprite][3]);
break;
}
state->m_aga_sprite_dma_used_words[sprite] = 0;
}
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) && !(state->m_sprite_ctl_written & 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;
/* fetch additional words */
switch((CUSTOM_REG(REG_FMODE) >> 2) & 0x03)
{
case 0:
break;
case 1:
case 2:
CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) += 4;
break;
case 3:
CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) += 3*4;
break;
}
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(state->m_aga_sprdata[num][0], state->m_aga_sprdatb[num][0]);
state->m_aga_sprite_dma_used_words[num] = 1;
}
}
/* 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 (state->m_sprite_remain[num] == 0)
{
if (state->m_aga_sprite_dma_used_words[num] < state->m_aga_sprite_fetched_words)
{
int w = state->m_aga_sprite_dma_used_words[num];
state->m_sprite_remain[num] = 16;
state->m_sprite_shiftreg[num] = interleave_sprite_data(state->m_aga_sprdata[num][w], state->m_aga_sprdatb[num][w]);
state->m_aga_sprite_dma_used_words[num]++;
}
}
}
}
/* 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;
int esprm, osprm;
esprm = CUSTOM_REG(REG_BPLCON4) & 0x00f0;
osprm = (CUSTOM_REG(REG_BPLCON4) & 0x000f) << 4;
/* 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 0-7
sprite present bitmask in bits 8-9
topmost sprite pair index in bits 12-13
*/
UINT32 result = (collide << 8) | (pair << 12);
/* 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)
{
UINT64 *aga_bpldat = state->m_aga_bpldat;
UINT8 pix = (aga_bpldat[0] >> obitoffs) & 1;
if (planes >= 3)
{
pix |= ((aga_bpldat[2] >> obitoffs) & 1) << 2;
if (planes >= 5)
{
pix |= ((aga_bpldat[4] >> obitoffs) & 1) << 4;
if (planes >= 7)
pix |= ((aga_bpldat[6] >> obitoffs) & 1) << 6;
}
}
return pix;
}
INLINE UINT8 assemble_even_bitplanes(amiga_state *state, int planes, int ebitoffs)
{
UINT8 pix = 0;
if (planes >= 2)
{
UINT64 *aga_bpldat = state->m_aga_bpldat;
pix |= ((aga_bpldat[1] >> ebitoffs) & 1) << 1;
if (planes >= 4)
{
pix |= ((aga_bpldat[3] >> ebitoffs) & 1) << 3;
if (planes >= 6)
{
pix |= ((aga_bpldat[5] >> ebitoffs) & 1) << 5;
if (planes >= 8)
pix |= ((aga_bpldat[7] >> ebitoffs) & 1) << 7;
}
}
}
return pix;
}
INLINE void fetch_bitplane_data(amiga_state *state, int plane)
{
UINT64 *aga_bpldat = state->m_aga_bpldat;
switch (CUSTOM_REG(REG_FMODE) & 0x03)
{
case 0:
aga_bpldat[plane] = (UINT64)(*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2));
CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2;
break;
case 1:
case 2:
aga_bpldat[plane] = (UINT64)(*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2)) << 16;
CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2;
aga_bpldat[plane] |= ((UINT64)(*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2)));
CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2;
break;
case 3:
aga_bpldat[plane] = (UINT64)(*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2)) << 48;
CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2;
aga_bpldat[plane] |= ((UINT64)(*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2))) << 32;
CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2;
aga_bpldat[plane] |= ((UINT64)(*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2))) << 16;
CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2;
aga_bpldat[plane] |= (UINT64)(*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2));
CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2;
break;
}
}
void amiga_aga_diwhigh_written(running_machine &machine, int written)
{
amiga_state *state = machine.driver_data<amiga_state>();
state->m_aga_diwhigh_written = written;
}
/*************************************
*
* Hold and modify pixel computations
*
*************************************/
INLINE int update_ham(amiga_state *state, int newpix)
{
switch (newpix & 0x03)
{
case 0:
state->m_ham_color = state->m_aga_palette[(newpix >> 2) & 0x3f];
break;
case 1:
state->m_ham_color = MAKE_RGB(RGB_RED(state->m_ham_color), RGB_GREEN(state->m_ham_color), (newpix & 0xfc) | (RGB_BLUE(state->m_ham_color) & 0x03));
break;
case 2:
state->m_ham_color = MAKE_RGB((newpix & 0xfc) | (RGB_RED(state->m_ham_color) & 0x03), RGB_GREEN(state->m_ham_color), RGB_BLUE(state->m_ham_color));
break;
case 3:
state->m_ham_color = MAKE_RGB(RGB_RED(state->m_ham_color), (newpix & 0xfc) | (RGB_GREEN(state->m_ham_color) & 0x03), RGB_BLUE(state->m_ham_color));
break;
}
return state->m_ham_color;
}
/*************************************
*
* Single scanline rasterizer
*
*************************************/
void amiga_aga_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;
UINT32 *dst = NULL;
int ebitoffs = 0, obitoffs = 0;
int ecolmask = 0, ocolmask = 0;
int edelay = 0, odelay = 0;
int next_copper_x;
int pl;
int defbitoffs = 0;
pen_t *aga_palette = state->m_aga_palette;
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_ADDR32(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 = 2; /* copper runs on odd timeslots */
for (x = 0; x < 0xe8*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;
if ( CUSTOM_REG(REG_BPLCON0) & BPLCON0_BPU3 )
planes |= 8;
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;
/* get default bitoffset */
switch(CUSTOM_REG(REG_FMODE) & 0x3)
{
case 0: defbitoffs = 15; break;
case 1:
case 2: defbitoffs = 31; break;
case 3: defbitoffs = 63; break;
}
/* 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 - ((defbitoffs >= 31) ? 16 : 0)) : (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);
if (state->m_aga_diwhigh_written)
{
hstart |= ((CUSTOM_REG(REG_DIWHIGH) >> 5) & 1) << 8;
hstop |= ((CUSTOM_REG(REG_DIWHIGH) >> 13) & 1) << 8;
}
else
{
hstop |= 0x100;
}
if ( hstop < hstart )
{
hstart = 0x00;
hstop = 0x1ff;
}
/* compute the vertical start/stop */
vstart = CUSTOM_REG(REG_DIWSTRT) >> 8;
vstop = (CUSTOM_REG(REG_DIWSTOP) >> 8);
if (state->m_aga_diwhigh_written)
{
vstart |= (CUSTOM_REG(REG_DIWHIGH) & 7) << 8;
vstop |= ((CUSTOM_REG(REG_DIWHIGH) >> 8) & 7) << 8;
}
else
{
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] = aga_palette[0];
/* 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 < 8; pl++)
state->m_aga_bpldat[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 & 0x55; // 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 & 0xaa;
/* 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 & 0xff;
pri = (sprpix >> 10);
/* sprite has priority */
if (sprpix && pf1pri > pri)
{
dst[x*2+0] =
dst[x*2+1] = aga_palette[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 >> 12);
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] = aga_palette[pix];
else
dst[x*2+0] = aga_palette[state->m_separate_bitplanes[(CUSTOM_REG(REG_BPLCON2) >> 6) & 1][pfpix0]];
/* mask out the sprite if it doesn't have priority */
pix = sprpix & 0xff;
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] = aga_palette[pix];
else
dst[x*2+1] = aga_palette[state->m_separate_bitplanes[(CUSTOM_REG(REG_BPLCON2) >> 6) & 1][pfpix1]];
}
/* single playfield mode */
else
{
pix = sprpix & 0xff;
pri = (sprpix >> 12);
/* sprite has priority */
if (sprpix && pf1pri > pri)
{
dst[x*2+0] =
dst[x*2+1] = aga_palette[pix];
}
/* playfield has priority */
else
{
dst[x*2+0] = aga_palette[pfpix0];
dst[x*2+1] = aga_palette[pfpix1];
}
}
}
}
}
#if 0
if ( machine.primary_screen->frame_number() % 16 == 0 && scanline == 250 )
{
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=%02x ed=%02x start=%d stop=%d hstart=%04x hstop=%04x diwhigh=%04x fetchbits=%d )", p, planes, odelay, edelay, ddf_start_pixel, ddf_stop_pixel, CUSTOM_REG(REG_DIWSTRT), CUSTOM_REG(REG_DIWSTOP), CUSTOM_REG(REG_DIWHIGH), defbitoffs );
//popmessage("%s(%d pl bplpt1=%06X, bpl1mod=%04x, offset=%x)", p, planes, CUSTOM_REG_LONG(REG_BPL1PTH), CUSTOM_REG(REG_BPL1MOD), hires_modulo_offset );
}
#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", wait_offset -= 1);
if (machine.input().code_pressed(KEYCODE_W))
popmessage("%d", wait_offset += 1);
}
#endif
}
/*************************************
*
* Update
*
*************************************/
SCREEN_UPDATE( amiga_aga )
{
int y;
/* render each scanline in the visible region */
for (y = cliprect->min_y; y <= cliprect->max_y; y++)
amiga_aga_render_scanline(screen->machine(), bitmap, y);
return 0;
}