/*************************************************************************
Centuri Aztarac hardware
*************************************************************************/
#include "emu.h"
#include "video/vector.h"
#include "includes/aztarac.h"
#define AVECTOR(m, x, y, color, intensity) \
vector_add_point (m, state->m_xcenter + ((x) << 16), state->m_ycenter - ((y) << 16), color, intensity)
INLINE void read_vectorram(UINT16 *vectorram, int addr, int *x, int *y, int *c)
{
*c = vectorram[addr] & 0xffff;
*x = vectorram[addr + 0x800] & 0x03ff;
*y = vectorram[addr + 0x1000] & 0x03ff;
if (*x & 0x200) *x |= 0xfffffc00;
if (*y & 0x200) *y |= 0xfffffc00;
}
WRITE16_HANDLER( aztarac_ubr_w )
{
aztarac_state *state = space->machine().driver_data<aztarac_state>();
UINT16 *vectorram = state->m_vectorram;
int x, y, c, intensity, xoffset, yoffset, color;
int defaddr, objaddr=0, ndefs;
if (data) /* data is the global intensity (always 0xff in Aztarac). */
{
vector_clear_list();
while (1)
{
read_vectorram(vectorram, objaddr, &xoffset, &yoffset, &c);
objaddr++;
if (c & 0x4000)
break;
if ((c & 0x2000) == 0)
{
defaddr = (c >> 1) & 0x7ff;
AVECTOR (space->machine(), xoffset, yoffset, 0, 0);
read_vectorram(vectorram, defaddr, &x, &ndefs, &c);
ndefs++;
if (c & 0xff00)
{
/* latch color only once */
intensity = (c >> 8);
color = VECTOR_COLOR222(c & 0x3f);
while (ndefs--)
{
defaddr++;
read_vectorram(vectorram, defaddr, &x, &y, &c);
if ((c & 0xff00) == 0)
AVECTOR (space->machine(), x + xoffset, y + yoffset, 0, 0);
else
AVECTOR (space->machine(), x + xoffset, y + yoffset, color, intensity);
}
}
else
{
/* latch color for every definition */
while (ndefs--)
{
defaddr++;
read_vectorram(vectorram, defaddr, &x, &y, &c);
color = VECTOR_COLOR222(c & 0x3f);
AVECTOR (space->machine(), x + xoffset, y + yoffset, color, c >> 8);
}
}
}
}
}
}
VIDEO_START( aztarac )
{
aztarac_state *state = machine.driver_data<aztarac_state>();
const rectangle &visarea = machine.primary_screen->visible_area();
int xmin = visarea.min_x;
int ymin = visarea.min_y;
int xmax = visarea.max_x;
int ymax = visarea.max_y;
state->m_xcenter=((xmax + xmin) / 2) << 16;
state->m_ycenter=((ymax + ymin) / 2) << 16;
VIDEO_START_CALL(vector);
}