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nereid: add overlay support

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Required for the upcoming HP 98550A support.
This commit is contained in:
Sven Schnelle 2018-11-17 19:41:17 +01:00
parent 92c2011514
commit a659260af3
2 changed files with 111 additions and 17 deletions
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111
src/devices/video/nereid.cpp
View File

@ -30,77 +30,158 @@ void nereid_device::device_start()
save_item(NAME(m_green));
save_item(NAME(m_blue));
save_item(NAME(m_index));
save_item(NAME(m_palette));
save_item(NAME(m_video_palette));
save_item(NAME(m_overlay_palette));
save_item(NAME(m_plane_mask));
save_item(NAME(m_overlay_ctl));
save_item(NAME(m_overlay_index));
save_item(NAME(m_unknown_a0));
}
void nereid_device::device_reset()
{
memset(&m_palette, 0, sizeof(m_palette));
std::fill(m_video_palette.begin(), m_video_palette.end(), 0);
std::fill(m_overlay_palette.begin(), m_overlay_palette.end(), 0);
m_index = 0;
m_plane_mask = 0;
m_overlay_ctl = 0;
m_red = 0;
m_green = 0;
m_blue = 0;
m_unknown_a0 = 0;
m_overlay_index = 0;
}
READ16_MEMBER(nereid_device::ctrl_r)
{
LOG("NEREID ctrl_r: %02X\n", offset);
switch(offset & 0x7f) {
switch (offset & 0x7f) {
case NEREID_BUSY:
return 0;
case NEREID_RED_DATA:
return 0xff00 | m_red;
case NEREID_GREEN_DATA:
return 0xff00 | m_green;
case NEREID_BLUE_DATA:
return 0xff00 | m_blue;
case NEREID_INDEX:
return 0xff00 | ~m_index;
case NEREID_INDEX0:
return 0xff00 | m_index;
case NEREID_OVERLAY_CTL:
return 0xff00 | m_overlay_ctl;
case NEREID_WRITE_STROBE:
return 0xff00;
case NEREID_PLANE_MASK:
return 0xff00 | m_plane_mask;
case NEREID_UNKNOWN_A0:
return 0xff00 | m_unknown_a0;
case NEREID_OVERLAY_INDEX:
return 0xff00 | m_overlay_index;
case NEREID_REV:
return 0xff01;
default:
return space.unmap();
LOG("NEREID ctrl_r: unknown register %04X\n", offset);
return 0xffff;//space.unmap();
}
return 0xffff;
}
WRITE16_MEMBER(nereid_device::ctrl_w)
{
LOG("NEREID: ctrl_w %02X = %02X\n", offset, data);
LOG("NEREID: ctrl_w %02X = %02X\n", offset << 1, data);
data &= 0xff;
switch(offset & 0x7f) {
switch (offset & 0x7f) {
case NEREID_RED_DATA:
m_red = data;
LOG("W NEREID_RED_DATA = %04X\n", m_red);
break;
case NEREID_GREEN_DATA:
m_green = data;
LOG("W NEREID_GREEN_DATA = %04X\n", m_green);
break;
case NEREID_BLUE_DATA:
m_blue = data;
LOG("W NEREID_BLUE_DATA = %04X\n", m_blue);
break;
case NEREID_INDEX:
m_index = ~data;
LOG("W NEREID_INDEX = %04X\n", m_index);
break;
case NEREID_INDEX0:
m_index =data;
LOG("W NEREID_INDEX0 = %04X\n", data);
break;
case NEREID_WRITE_STROBE:
LOG("NEREID: set color index %u: rgb_t(%u,%u,%u)\n",
m_index, m_red, m_green, m_blue);
m_palette[m_index] = rgb_t(m_red, m_green, m_blue);
if (m_overlay_index & 8) {
const int index = (m_overlay_index >> 1) & 0x3;
LOG("NEREID: set overlay color index %u: rgb_t(%u,%u,%u)\n",
index, m_red, m_green, m_blue);
m_overlay_palette[index] = rgb_t(m_red, m_green, m_blue);
} else {
LOG("NEREID: set video color index %u: rgb_t(%u,%u,%u)\n",
m_index, m_red, m_green, m_blue);
m_video_palette[m_index] = rgb_t(m_red, m_green, m_blue);
}
break;
case NEREID_READ_STROBE:
m_red = m_palette[m_index].r();
m_green = m_palette[m_index].g();
m_blue = m_palette[m_index].b();
m_red = m_video_palette[m_index].r();
m_green = m_video_palette[m_index].g();
m_blue = m_video_palette[m_index].b();
break;
case NEREID_PLANE_MASK:
m_plane_mask = data;
LOG("W NEREID_PLANE_MASK = %02x\n", m_plane_mask);
break;
case NEREID_OVERLAY_CTL:
m_overlay_ctl = data;
LOG("W NEREID_OVERLAY_CTL = %02x\n", m_overlay_ctl);
break;
case NEREID_UNKNOWN_A0:
m_unknown_a0 = data;
LOG("UW A0 = %04x\n", data);
break;
case NEREID_OVERLAY_INDEX:
m_overlay_index = data;
LOG("W OVERLAY_INDEX = %04x\n", data);
break;
default:
LOG("nereid::ctrl_w: %X = %04X (mask %04X)\n", offset, data, mem_mask);
LOG("nereid::ctrl_w: unknown %X = %04X (mask %04X)\n", offset << 1, data, mem_mask);
break;
}
}
rgb_t nereid_device::map_color(uint8_t input)
rgb_t nereid_device::map_color(uint8_t input, uint8_t ovl)
{
return m_palette[input & m_plane_mask];
ovl &= m_overlay_ctl;
if (ovl == 0)
return m_video_palette[input & m_plane_mask];
else
return m_overlay_palette[ovl & m_plane_mask];
}

17
src/devices/video/nereid.h
View File

@ -13,7 +13,7 @@ public:
DECLARE_READ16_MEMBER(ctrl_r);
DECLARE_WRITE16_MEMBER(ctrl_w);
rgb_t map_color(uint8_t input);
rgb_t map_color(uint8_t input, uint8_t ovl = 0);
protected:
nereid_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
@ -22,15 +22,25 @@ protected:
private:
static constexpr int NEREID_BUSY=1;
static constexpr int NEREID_BLANK_ALL=0x2e;
static constexpr int NEREID_WRITE_STROBE_OVERLAY=0x3c;
static constexpr int NEREID_UNKNOWN_A0=0x50;
static constexpr int NEREID_OVERLAY_CTL=0x51;
static constexpr int NEREID_INDEX0=0x58;
static constexpr int NEREID_RED_DATA=0x59;
static constexpr int NEREID_GREEN_DATA=0x5a;
static constexpr int NEREID_BLUE_DATA=0x5b;
static constexpr int NEREID_INDEX=0x5c;
static constexpr int NEREID_PLANE_MASK=0x5d;
static constexpr int NEREID_OVERLAY_INDEX=0x5e;
static constexpr int NEREID_REV=0x5f;
static constexpr int NEREID_WRITE_STROBE=0x78;
static constexpr int NEREID_READ_STROBE=0x7c;
rgb_t m_palette[256];
std::array<rgb_t, 256> m_video_palette;
std::array<rgb_t, 256> m_overlay_palette;
/* registers */
uint8_t m_red;
@ -38,6 +48,9 @@ private:
uint8_t m_blue;
uint8_t m_index;
uint8_t m_plane_mask;
uint8_t m_overlay_ctl;
uint8_t m_unknown_a0;
uint8_t m_overlay_index;
};
DECLARE_DEVICE_TYPE(NEREID, nereid_device)