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Support cursor at point of output.

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This commit is contained in:
Thomas Harte 2023-12-02 22:44:26 -05:00
parent e77f4457c2
commit 4957ae7de1
1 changed files with 41 additions and 32 deletions
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73
Machines/PCCompatible/PCCompatible.cpp
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@ -549,41 +549,50 @@ class MDA {
}
}
// TODO: cursor.
if(pixels) {
const uint8_t attributes = ram[((state.refresh_address << 1) + 1) & 0xfff];
const uint8_t glyph = ram[((state.refresh_address << 1) + 0) & 0xfff];
uint8_t row = font[(glyph * 14) + state.row_address];
static constexpr uint8_t high_intensity = 0x0d;
static constexpr uint8_t low_intensity = 0x09;
static constexpr uint8_t off = 0x00;
const uint8_t intensity = (attributes & 0x08) ? 0x0d : 0x09;
uint8_t blank = 0;
// Handle irregular attributes.
// Cf. http://www.seasip.info/VintagePC/mda.html#memmap
switch(attributes) {
case 0x00: case 0x08: case 0x80: case 0x88:
row = 0;
break;
case 0x70: case 0x78: case 0xf0: case 0xf8:
row ^= 0xff;
blank = intensity;
break;
}
if(((attributes & 7) == 1) && state.row_address == 13) {
// Draw as underline.
std::fill(pixel_pointer, pixel_pointer + 9, intensity);
if(state.cursor) {
pixel_pointer[0] = pixel_pointer[1] = pixel_pointer[2] = pixel_pointer[3] =
pixel_pointer[4] = pixel_pointer[5] = pixel_pointer[6] = pixel_pointer[7] =
pixel_pointer[8] = low_intensity;
} else {
// Draw according to ROM contents, possibly duplicating final column.
pixel_pointer[0] = (row & 0x80) ? intensity : 0;
pixel_pointer[1] = (row & 0x40) ? intensity : 0;
pixel_pointer[2] = (row & 0x20) ? intensity : 0;
pixel_pointer[3] = (row & 0x10) ? intensity : 0;
pixel_pointer[4] = (row & 0x08) ? intensity : 0;
pixel_pointer[5] = (row & 0x04) ? intensity : 0;
pixel_pointer[6] = (row & 0x02) ? intensity : 0;
pixel_pointer[7] = (row & 0x01) ? intensity : 0;
pixel_pointer[8] = (glyph >= 0xc0 && glyph < 0xe0) ? pixel_pointer[7] : blank;
const uint8_t attributes = ram[((state.refresh_address << 1) + 1) & 0xfff];
const uint8_t glyph = ram[((state.refresh_address << 1) + 0) & 0xfff];
uint8_t row = font[(glyph * 14) + state.row_address];
const uint8_t intensity = (attributes & 0x08) ? high_intensity : low_intensity;
uint8_t blank = off;
// Handle irregular attributes.
// Cf. http://www.seasip.info/VintagePC/mda.html#memmap
switch(attributes) {
case 0x00: case 0x08: case 0x80: case 0x88:
row = 0;
break;
case 0x70: case 0x78: case 0xf0: case 0xf8:
row ^= 0xff;
blank = intensity;
break;
}
if(((attributes & 7) == 1) && state.row_address == 13) {
// Draw as underline.
std::fill(pixel_pointer, pixel_pointer + 9, intensity);
} else {
// Draw according to ROM contents, possibly duplicating final column.
pixel_pointer[0] = (row & 0x80) ? intensity : off;
pixel_pointer[1] = (row & 0x40) ? intensity : off;
pixel_pointer[2] = (row & 0x20) ? intensity : off;
pixel_pointer[3] = (row & 0x10) ? intensity : off;
pixel_pointer[4] = (row & 0x08) ? intensity : off;
pixel_pointer[5] = (row & 0x04) ? intensity : off;
pixel_pointer[6] = (row & 0x02) ? intensity : off;
pixel_pointer[7] = (row & 0x01) ? intensity : off;
pixel_pointer[8] = (glyph >= 0xc0 && glyph < 0xe0) ? pixel_pointer[7] : blank;
}
}
pixel_pointer += 9;
}