#include "includes/vc4000.h"
/*
emulation of signetics 2636 video/audio device
seams to me like a special microcontroller
mask programmed
note about mame s2636 emulation:
less encapsuled
missing grid, sound generation, retriggered sprites, paddle reading, score display
not "rasterline" based
*/
#define STICKCENTRE (105)
#define STICKLOW (20)
#define STICKHIGH (225)
#define VC4000_END_LINE (269)
void vc4000_state::video_start()
{
screen_device *screen = machine().first_screen();
int i;
for (i=0;i<0x20; i++)
{
m_sprite_collision[i]=0;
if ((i&3)==3) m_sprite_collision[i]|=0x20;
if ((i&5)==5) m_sprite_collision[i]|=0x10;
if ((i&9)==9) m_sprite_collision[i]|=8;
if ((i&6)==6) m_sprite_collision[i]|=4;
if ((i&0xa)==0xa) m_sprite_collision[i]|=2;
if ((i&0xc)==0xc) m_sprite_collision[i]|=1;
m_background_collision[i]=0;
if ((i&0x11)==0x11) m_background_collision[i]|=0x80;
if ((i&0x12)==0x12) m_background_collision[i]|=0x40;
if ((i&0x14)==0x14) m_background_collision[i]|=0x20;
if ((i&0x18)==0x18) m_background_collision[i]|=0x10;
}
m_joy1_x = STICKCENTRE;
m_joy1_y = STICKCENTRE;
m_joy2_x = STICKCENTRE;
m_joy2_y = STICKCENTRE;
memset(&m_video, 0, sizeof(m_video));
for (i=0; i<3; i++)
{
m_video.sprites[i].data = &m_video.reg.d.sprites[i];
m_video.sprites[i].mask = 1 << i;
}
m_video.sprites[3].data = &m_video.reg.d.sprite4;
m_video.sprites[3].mask = 1 << 3;
m_bitmap = auto_bitmap_ind16_alloc(machine(), screen->width(), screen->height());
}
inline UINT8 vc4000_state::vc4000_joystick_return_to_centre(UINT8 joy)
{
UINT8 data;
if (joy > (STICKCENTRE+5))
data=joy-5;
else
if (joy < (STICKCENTRE-5))
data=joy+5;
else
data=105;
return data;
}
READ8_MEMBER( vc4000_state::vc4000_video_r )
{
UINT8 data=0;
if (offset > 0xcf) offset &= 0xcf; // c0-cf is mirrored at d0-df, e0-ef, f0-ff
switch (offset)
{
case 0xca: // Background-sprite collision (bit 7-4) and sprite finished (bit 3-0)
data |= m_video.background_collision;
m_video.background_collision=0;
if (m_video.sprites[3].finished)
{
data |= 1;
m_video.sprites[3].finished = FALSE;
}
if (m_video.sprites[2].finished)
{
data |= 2;
m_video.sprites[2].finished = FALSE;
}
if (m_video.sprites[1].finished)
{
data |= 4;
m_video.sprites[1].finished = FALSE;
}
if (m_video.sprites[0].finished)
{
data |= 8;
m_video.sprites[0].finished = FALSE;
}
break;
case 0xcb: // VRST-Flag (bit 6) and intersprite collision (bit5-0)
data = m_video.sprite_collision | (m_video.reg.d.sprite_collision & 0xc0);
m_video.sprite_collision = 0;
m_video.reg.d.sprite_collision &= 0xbf;
break;
#ifndef ANALOG_HACK
case 0xcc:
if (!activeS2650_FO)) data = m_io_joy1_x->read();
else data = m_io_joy1_y->read();
break;
case 0xcd:
if (!activecpu_get_reg(S2650_FO)) data = m_io_joy2_x->read();
else data = m_io_joy2_y->read();
break;
#else
case 0xcc: /* left joystick */
if (m_config->read()&1)
{ /* paddle */
if (!m_maincpu->state_int(S2650_FO))
{
data = m_joys->read() & 0x03;
switch (data)
{
case 0x01:
m_joy1_x-=5;
if (m_joy1_x < STICKLOW) m_joy1_x=STICKLOW;
break;
case 0x02:
m_joy1_x+=5;
if (m_joy1_x > STICKHIGH) m_joy1_x=STICKHIGH;
break;
case 0x00:
m_joy1_x = vc4000_joystick_return_to_centre(m_joy1_x);
}
data = m_joy1_x;
}
else
{
data = m_joys->read() & 0x0c;
switch (data)
{
case 0x08:
m_joy1_y-=5;
if (m_joy1_y < STICKLOW) m_joy1_y=STICKLOW;
break;
case 0x04:
m_joy1_y+=5;
if (m_joy1_y > STICKHIGH) m_joy1_y=STICKHIGH;
break;
// case 0x00:
// m_joy1_y = vc4000_joystick_return_to_centre(m_joy1_y);
}
data = m_joy1_y;
}
}
else
{ /* buttons */
if (!m_maincpu->state_int(S2650_FO))
{
data = m_joys->read() & 0x03;
switch (data)
{
case 0x01:
m_joy1_x=STICKLOW;
break;
case 0x02:
m_joy1_x=STICKHIGH;
break;
default: /* autocentre */
m_joy1_x=STICKCENTRE;
}
data = m_joy1_x;
}
else
{
data = m_joys->read() & 0x0c;
switch (data)
{
case 0x08:
m_joy1_y=STICKLOW;
break;
case 0x04:
m_joy1_y=STICKHIGH;
break;
default:
m_joy1_y=STICKCENTRE;
}
data = m_joy1_y;
}
}
break;
case 0xcd: /* right joystick */
if (m_config->read()&1)
{
if (!m_maincpu->state_int(S2650_FO))
{
data = m_joys->read() & 0x30;
switch (data)
{
case 0x10:
m_joy2_x-=5;
if (m_joy2_x < STICKLOW) m_joy2_x=STICKLOW;
break;
case 0x20:
m_joy2_x+=5;
if (m_joy2_x > STICKHIGH) m_joy2_x=STICKHIGH;
case 0x00:
m_joy2_x = vc4000_joystick_return_to_centre(m_joy2_x);
break;
}
data = m_joy2_x;
}
else
{
data = m_joys->read() & 0xc0;
switch (data)
{
case 0x80:
m_joy2_y-=5;
if (m_joy2_y < STICKLOW) m_joy2_y=STICKLOW;
break;
case 0x40:
m_joy2_y+=5;
if (m_joy2_y > STICKHIGH) m_joy2_y=STICKHIGH;
break;
// case 0x00:
// m_joy2_y = vc4000_joystick_return_to_centre(m_joy2_y);
}
data = m_joy2_y;
}
}
else
{
if (!m_maincpu->state_int(S2650_FO))
{
data = m_joys->read() & 0x30;
switch (data)
{
case 0x10:
m_joy2_x=STICKLOW;
break;
case 0x20:
m_joy2_x=STICKHIGH;
break;
default: /* autocentre */
m_joy2_x=STICKCENTRE;
}
data = m_joy2_x;
}
else
{
data = m_joys->read() & 0xc0;
switch (data)
{
case 0x80:
m_joy2_y=STICKLOW;
break;
case 0x40:
m_joy2_y=STICKHIGH;
break;
default:
m_joy2_y=STICKCENTRE;
}
data = m_joy2_y;
}
}
break;
#endif
default:
data = m_video.reg.data[offset];
break;
}
return data;
}
WRITE8_MEMBER( vc4000_state::vc4000_video_w )
{
// m_video.reg.data[offset]=data;
if (offset > 0xcf) offset &= 0xcf; // c0-cf is mirrored at d0-df, e0-ef, f0-ff
switch (offset)
{
case 0xc0: // Sprite size
m_video.sprites[0].size=1<<(data&3);
m_video.sprites[1].size=1<<((data>>2)&3);
m_video.sprites[2].size=1<<((data>>4)&3);
m_video.sprites[3].size=1<<((data>>6)&3);
break;
case 0xc1: // Sprite 1+2 color
m_video.sprites[0].scolor=((~data>>3)&7);
m_video.sprites[1].scolor=(~data&7);
break;
case 0xc2: // Sprite 2+3 color
m_video.sprites[2].scolor=((~data>>3)&7);
m_video.sprites[3].scolor=(~data&7);
break;
case 0xc3: // Score control
m_video.reg.d.score_control = data;
break;
case 0xc6: // Background color
m_video.reg.d.background = data;
break;
case 0xc7: // Soundregister
m_video.reg.data[offset] = data;
machine().device<vc4000_sound_device>("custom")->soundport_w(0, data);
break;
case 0xc8: // Digits 1 and 2
m_video.reg.d.bcd[0] = data;
break;
case 0xc9: // Digits 3 and 4
m_video.reg.d.bcd[1] = data;
break;
case 0xca: // Background-sprite collision (bit 7-4) and sprite finished (bit 3-0)
m_video.reg.data[offset]=data;
m_video.background_collision=data;
break;
case 0xcb: // VRST-Flag (bit 6) and intersprite collision (bit5-0)
m_video.reg.data[offset]=data;
m_video.sprite_collision=data;
break;
default:
m_video.reg.data[offset]=data;
}
}
READ8_MEMBER( vc4000_state::vc4000_vsync_r )
{
return m_video.line >= VC4000_END_LINE ? 0x80 : 0;
}
static const char led[20][12+1] =
{
"aaaabbbbcccc",
"aaaabbbbcccc",
"aaaabbbbcccc",
"aaaabbbbcccc",
"llll dddd",
"llll dddd",
"llll dddd",
"llll dddd",
"kkkkmmmmeeee",
"kkkkmmmmeeee",
"kkkkmmmmeeee",
"kkkkmmmmeeee",
"jjjj ffff",
"jjjj ffff",
"jjjj ffff",
"jjjj ffff",
"iiiihhhhgggg",
"iiiihhhhgggg",
"iiiihhhhgggg",
"iiiihhhhgggg"
};
void vc4000_state::vc4000_draw_digit(bitmap_ind16 &bitmap, int x, int y, int d, int line)
{
static const int digit_to_segment[0x10]={
0x0fff, 0x007c, 0x17df, 0x15ff, 0x1c7d, 0x1df7, 0x1ff7, 0x007f, 0x1fff, 0x1dff
};
int i=line,j;
for (j=0; j<sizeof(led[0])-1; j++)
{
if (led[i][j] != ' ' && digit_to_segment[d]&(1<<(led[i][j]-'a')) )
bitmap.pix16(y+i, x+j) = ((m_video.reg.d.background>>4)&7)^7;
}
}
inline void vc4000_state::vc4000_collision_plot(UINT8 *collision, UINT8 data, UINT8 color, int scale)
{
int i,j,m;
for (j=0,m=0x80; j<8; j++, m>>=1)
{
if (data&m)
for (i=0; i<scale; i++, collision++) *collision|=color;
else
collision+=scale;
}
}
void vc4000_state::vc4000_sprite_update(bitmap_ind16 &bitmap, UINT8 *collision, SPRITE *This)
{
int i,j,m;
if (m_video.line==0)
{
This->y=This->data->y1;
This->state=0;
This->delay=0;
This->finished=FALSE;
}
This->finished_now=FALSE;
if (m_video.line>VC4000_END_LINE) return;
switch (This->state)
{
case 0:
if (m_video.line != This->y + 2) break;
This->state++;
case 1: case 2: case 3: case 4: case 5: case 6: case 7: case 8:case 9:case 10:
vc4000_collision_plot(collision+This->data->x1, This->data->bitmap[This->state-1],This->mask,This->size);
for (j=0,m=0x80; j<8; j++, m>>=1)
{
if (This->data->bitmap[This->state-1]&m)
{
for (i=0; i<This->size; i++)
{
m_objects[This->data->x1 + i + j*This->size] |= This->scolor;
m_objects[This->data->x1 + i + j*This->size] &= 7;
}
}
}
This->delay++;
if (This->delay>=This->size)
{
This->delay=0;
This->state++;
}
if (This->state>10)
{
This->finished=TRUE;
This->finished_now=TRUE;
}
break;
case 11:
This->y=This->data->y2;
if (This->y==255)
This->y=0;
else
This->y++;
if (This->y>252) break;
This->delay=0;
This->state++;
case 12:
if (This->y!=0)
{
This->y--;
break;
}
This->state++;
case 13: case 14: case 15: case 16: case 17: case 18: case 19:case 20:case 21:case 22:
vc4000_collision_plot(collision+This->data->x2,This->data->bitmap[This->state-13],This->mask,This->size);
for (j=0,m=0x80; j<8; j++, m>>=1)
{
if (This->data->bitmap[This->state-13]&m)
{
for (i=0; i<This->size; i++)
{
int offset = This->data->x2 + i + j*This->size;
// clip objects outside the object buffer.
// someone who knows this hardware should look at
// it properly.
if (offset < 256)
{
m_objects[offset] |= This->scolor;
m_objects[offset] &= 7;
}
}
}
}
This->delay++;
if (This->delay<This->size) break;
This->delay=0;
This->state++;
if (This->state<23) break;
This->finished=TRUE;
This->finished_now=TRUE;
This->state=11;
break;
}
}
inline void vc4000_state::vc4000_draw_grid(UINT8 *collision)
{
screen_device *screen = machine().first_screen();
int width = screen->width();
int height = screen->height();
int i, j, m, x, line=m_video.line-20;
int w, k;
if (m_video.line>=height) return;
m_bitmap->plot_box(0, m_video.line, width, 1, (m_video.reg.d.background)&7);
if (line<0 || line>=200) return;
if (~m_video.reg.d.background & 8) return;
i=(line/20)*2;
if (line%20>=2) i++;
k=m_video.reg.d.grid_control[i>>2];
switch (k>>6) {
default:
case 0:case 2: w=1;break;
case 1: w=2;break;
case 3: w=4;break;
}
switch (i&3) {
case 0:
if (k&1) w=8;break;
case 1:
if ((line%40)<=10) {
if (k&2) w=8;
} else {
if (k&4) w=8;
}
break;
case 2: if (k&8) w=8;break;
case 3:
if ((line%40)<=30) {
if (k&0x10) w=8;
} else {
if (k&0x20) w=8;
}
break;
}
for (x=30, j=0, m=0x80; j<16; j++, x+=8, m>>=1)
{
if (m_video.reg.d.grid[i][j>>3]&m)
{
int l;
for (l=0; l<w; l++) collision[x+l]|=0x10;
m_bitmap->plot_box(x, m_video.line, w, 1, (m_video.reg.d.background>>4)&7);
}
if (j==7) m=0x100;
}
}
INTERRUPT_GEN_MEMBER(vc4000_state::vc4000_video_line)
{
int x,y,i;
UINT8 collision[400]={0}; // better alloca or gcc feature of non constant long automatic arrays
const rectangle &visarea = machine().primary_screen->visible_area();
assert(ARRAY_LENGTH(collision) >= machine().primary_screen->width());
m_video.line++;
if (m_irq_pause) m_irq_pause++;
if (m_video.line>311) m_video.line=0;
if (m_video.line==0)
{
m_video.background_collision=0;
m_video.sprite_collision=0;
m_video.reg.d.sprite_collision=0;
// logerror("begin of frame\n");
}
if (m_irq_pause>10)
{
m_maincpu->set_input_line(0, CLEAR_LINE);
m_irq_pause = 0;
}
if (m_video.line <= VC4000_END_LINE)
{
vc4000_draw_grid(collision);
/* init object colours */
for (i=visarea.min_x; i<visarea.max_x; i++) m_objects[i]=8;
/* calculate object colours and OR overlapping object colours */
vc4000_sprite_update(*m_bitmap, collision, &m_video.sprites[0]);
vc4000_sprite_update(*m_bitmap, collision, &m_video.sprites[1]);
vc4000_sprite_update(*m_bitmap, collision, &m_video.sprites[2]);
vc4000_sprite_update(*m_bitmap, collision, &m_video.sprites[3]);
for (i=visarea.min_x; i<visarea.max_x; i++)
{
m_video.sprite_collision|=m_sprite_collision[collision[i]];
m_video.background_collision|=m_background_collision[collision[i]];
/* display final object colours */
if (m_objects[i] < 8)
m_bitmap->pix16(m_video.line, i) = m_objects[i];
}
y = m_video.reg.d.score_control&1?200:20;
if ((m_video.line>=y)&&(m_video.line<y+20))
{
x = 60;
vc4000_draw_digit(*m_bitmap, x, y, m_video.reg.d.bcd[0]>>4, m_video.line-y);
vc4000_draw_digit(*m_bitmap, x+16, y, m_video.reg.d.bcd[0]&0xf, m_video.line-y);
if (m_video.reg.d.score_control&2) x -= 16;
vc4000_draw_digit(*m_bitmap, x+48, y, m_video.reg.d.bcd[1]>>4, m_video.line-y);
vc4000_draw_digit(*m_bitmap, x+64, y, m_video.reg.d.bcd[1]&0xf, m_video.line-y);
}
}
if (m_video.line==VC4000_END_LINE) m_video.reg.d.sprite_collision |=0x40;
if (((m_video.line == VC4000_END_LINE) |
(m_video.sprites[3].finished_now) |
(m_video.sprites[2].finished_now) |
(m_video.sprites[1].finished_now) |
(m_video.sprites[0].finished_now)) && (!m_irq_pause))
{
m_maincpu->set_input_line_and_vector(0, ASSERT_LINE, 3);
m_irq_pause=1;
}
}
UINT32 vc4000_state::screen_update_vc4000(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
copybitmap(bitmap, *m_bitmap, 0, 0, 0, 0, cliprect);
return 0;
}