Miroirs/mame
1
0
Fork 0
mirror of https://github.com/mamedev/mame.git synced 2024-11-18 10:06:19 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions 5

heathkit/tlb.cpp: Clear screen lines when DE is deasserted. (#11396)

Browse source
This commit is contained in:
Mark Garlanger 2023-07-03 12:11:07 -05:00 committed by GitHub
parent ac800bae60
commit 2717e17997
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 39 additions and 25 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

64
src/mame/heathkit/tlb.cpp
View file

@ -305,38 +305,52 @@ void heath_tlb_device::right_shift_w(int state)
MC6845_UPDATE_ROW(heath_tlb_device::crtc_update_row)
{
if (!de)
{
return;
}
rgb_t const *const palette = m_palette->palette()->entry_list_raw();
uint32_t *p = &bitmap.pix(y);
for (uint16_t x = 0; x < x_count; x++)
if (de)
{
uint8_t inv = (x == cursor_x) ? 0xff : 0;
uint8_t chr = m_p_videoram[(ma + x) & 0x7ff];
if (chr & 0x80)
for (uint16_t x = 0; x < x_count; x++)
{
inv ^= 0xff;
chr &= 0x7f;
uint8_t inv = (x == cursor_x) ? 0xff : 0;
uint8_t chr = m_p_videoram[(ma + x) & 0x7ff];
if (chr & 0x80)
{
inv ^= 0xff;
chr &= 0x7f;
}
// get pattern of pixels for that character scanline
uint8_t const gfx = m_p_chargen[(chr<<4) | ra] ^ inv;
// Display a scanline of a character (8 pixels)
*p++ = palette[BIT(gfx, 7)];
*p++ = palette[BIT(gfx, 6)];
*p++ = palette[BIT(gfx, 5)];
*p++ = palette[BIT(gfx, 4)];
*p++ = palette[BIT(gfx, 3)];
*p++ = palette[BIT(gfx, 2)];
*p++ = palette[BIT(gfx, 1)];
*p++ = palette[BIT(gfx, 0)];
}
}
else
{
const rgb_t color = palette[0];
// get pattern of pixels for that character scanline
uint8_t const gfx = m_p_chargen[(chr<<4) | ra] ^ inv;
// Display a scanline of a character (8 pixels)
*p++ = palette[BIT(gfx, 7)];
*p++ = palette[BIT(gfx, 6)];
*p++ = palette[BIT(gfx, 5)];
*p++ = palette[BIT(gfx, 4)];
*p++ = palette[BIT(gfx, 3)];
*p++ = palette[BIT(gfx, 2)];
*p++ = palette[BIT(gfx, 1)];
*p++ = palette[BIT(gfx, 0)];
for (uint16_t x = 0; x < x_count; x++)
{
*p++ = color; // bit 7
*p++ = color; // bit 6
*p++ = color; // bit 5
*p++ = color; // bit 4
*p++ = color; // bit 3
*p++ = color; // bit 2
*p++ = color; // bit 1
*p++ = color; // bit 0
}
}
}