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hp9845: text video of 45C improved

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fulivi 2017-04-21 14:06:08 +02:00 committed by Vas Crabb
parent a2dbc22eb7
commit dc223d8103
1 changed files with 17 additions and 6 deletions
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23
src/mame/drivers/hp9845.cpp
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@ -2150,21 +2150,32 @@ void hp9845c_state::video_render_buff(unsigned video_scanline , unsigned line_in
bool cursor_line = line_in_row == 12;
bool ul_line = line_in_row == 14;
unsigned video_frame = (unsigned)m_screen->frame_number();
bool cursor_blink = BIT(video_frame , 3);
bool char_blink = BIT(video_frame , 4);
bool cursor_blink = BIT(video_frame , 4);
bool char_blink = !BIT(video_frame , 4);
for (unsigned i = 0; i < 80; i++) {
uint8_t charcode = m_video_buff[ buff_idx ].chars[ i ] & 0x7f;
uint8_t attrs = m_video_buff[ buff_idx ].attrs[ i ];
uint16_t chrgen_addr = ((uint16_t)(charcode ^ 0x7f) << 4) | line_in_row;
uint16_t pixels;
uint8_t color = (attrs >> 4) & 7;
if ((ul_line && BIT(attrs , 3)) ||
(cursor_line && cursor_blink && BIT(attrs , 0))) {
if (ul_line && BIT(attrs , 3)) {
// Color of underline: same as character
pixels = ~0;
} else if (cursor_line && cursor_blink && BIT(attrs , 0)) {
// Color of cursor: white
color = 7;
pixels = ~0;
} else if (char_blink && BIT(attrs , 2)) {
pixels = 0;
} else if (BIT(m_video_buff[ buff_idx ].chars[ i ] , 7)) {
// 98770A has hw support to fill the 1st and the 9th column of character matrix
// with pixels in 2nd and 8th columns, respectively. This feature is used in
// 98780A to make horizontal lines of line-drawing characters appear continuous
// (see hp9845t_state::video_render_buff).
// Apparently, though, HP did not use this feature at all in real
// machines (i.e. horizontal lines are broken by gaps)
pixels = (uint16_t)(m_optional_chargen[ chrgen_addr ] & 0x7f) << 1;
} else {
pixels = (uint16_t)(m_chargen[ chrgen_addr ] & 0x7f) << 1;
@ -2181,11 +2192,11 @@ void hp9845c_state::video_render_buff(unsigned video_scanline , unsigned line_in
if (m_graphic_sel && x >= VIDEO_770_ALPHA_L_LIM && x < VIDEO_770_ALPHA_R_LIM) {
// alpha overlays graphics (non-dominating)
if (pixel) {
m_bitmap.pix32(video_scanline , x) = pen[ pen_alpha((attrs >> 4) & 7) ];
m_bitmap.pix32(video_scanline , x) = pen[ pen_alpha(color) ];
}
} else {
// Graphics disabled or alpha-only zone
m_bitmap.pix32(video_scanline , x) = pen[ pixel ? pen_alpha((attrs >> 4) & 7) : pen_alpha(0) ];
m_bitmap.pix32(video_scanline , x) = pen[ pixel ? pen_alpha(color) : pen_alpha(0) ];
}
}
}