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v100: Put some characters on the screen (nw)

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This commit is contained in:
AJR 2018-01-15 01:50:10 -05:00
parent 93203b830a
commit eea5a97f14
1 changed files with 45 additions and 1 deletions
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46
src/mame/drivers/v100.cpp
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@ -36,6 +36,7 @@ public:
, m_earom(*this, "earom")
, m_picu(*this, "picu")
, m_p_chargen(*this, "chargen")
, m_videoram(*this, "videoram")
{ }
template<int n> DECLARE_WRITE8_MEMBER(brg_w);
@ -56,10 +57,52 @@ private:
required_device<er1400_device> m_earom;
required_device<i8214_device> m_picu;
required_region_ptr<u8> m_p_chargen;
required_shared_ptr<u8> m_videoram;
};
u32 v100_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
if (m_vtac->screen_reset())
{
bitmap.fill(rgb_t::black(), cliprect);
return 0;
}
unsigned row = cliprect.top() / 10;
unsigned scan = cliprect.top() % 10;
unsigned x0 = cliprect.left();
unsigned stride = (screen.visible_area().width() / CHAR_WIDTH) + 2;
unsigned ch0 = (x0 / CHAR_WIDTH) + (row * stride) + 2;
unsigned px0 = x0 % CHAR_WIDTH;
for (unsigned y = cliprect.top(); y <= cliprect.bottom(); y++)
{
unsigned x = x0, ch = ch0, px = px0;
u8 vchar = m_videoram[ch & m_videoram.mask()];
u8 gfxdata = m_p_chargen[((vchar & 0x7f) << 4) | scan];
while (x <= cliprect.right())
{
bitmap.pix(y, x) = BIT(gfxdata, 7) ? rgb_t::white() : rgb_t::black();
x++;
px++;
if ((px & 1) == 0)
gfxdata <<= 1;
if (px >= CHAR_WIDTH)
{
vchar = m_videoram[++ch & m_videoram.mask()];
gfxdata = m_p_chargen[((vchar & 0x7f) << 4) | scan];
px = 0;
}
}
scan++;
if (scan >= 10)
{
row++;
ch0 += stride;
scan = 0;
}
}
return 0;
}
@ -103,7 +146,8 @@ WRITE8_MEMBER(v100_state::ppi_porta_w)
static ADDRESS_MAP_START( mem_map, AS_PROGRAM, 8, v100_state )
AM_RANGE(0x0000, 0x3fff) AM_ROM AM_REGION("maincpu", 0)
AM_RANGE(0x4000, 0x5fff) AM_RAM
AM_RANGE(0x4000, 0x4fff) AM_RAM AM_SHARE("videoram")
AM_RANGE(0x5000, 0x5fff) AM_RAM
ADDRESS_MAP_END
static ADDRESS_MAP_START( io_map, AS_IO, 8, v100_state )