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Merge pull request #2494 from npwoods/mc6847_sg6_fix

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[MC6847] Fixed the "Semigraphics 6" mode on the CoCo/MC-10
This commit is contained in:
R. Belmont 2017-07-18 19:37:04 -04:00 committed by GitHub
commit 0278dda61b
2 changed files with 22 additions and 9 deletions
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29
src/devices/video/mc6847.cpp
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@ -908,6 +908,8 @@ mc6847_friend_device::character_map::character_map(const uint8_t *text_fontdata,
m_text_fontdata_lower_case[i] = text_fontdata[i + (i < 32*12 ? 64*12 : 0)] ^ (i < 32*12 ? 0xFF : 0x00);
m_text_fontdata_lower_case_inverse[i] = m_text_fontdata_lower_case[i] ^ 0xFF;
}
for (int i = 0; i < 128*12; i++)
m_stripes[i] = ~(i / 12);
// loop through all modes
for (mode = 0; mode < ARRAY_LENGTH(m_entries); mode++)
@ -921,7 +923,17 @@ mc6847_friend_device::character_map::character_map(const uint8_t *text_fontdata,
uint16_t color_base_0;
uint16_t color_base_1;
if ((mode & MODE_INTEXT) && !is_mc6847t1)
if ((mode & ((is_mc6847t1 ? 0 : MODE_INTEXT) | MODE_AS)) == MODE_AS)
{
// semigraphics 4
fontdata = semigraphics4_fontdata8x12;
character_mask = 0x0F;
color_base_0 = 8;
color_base_1 = 0;
color_shift_1 = 4;
color_mask_1 = 0x07;
}
else if (((mode & (MODE_INTEXT | MODE_AS)) == (MODE_INTEXT | MODE_AS)) && !is_mc6847t1)
{
// semigraphics 6
fontdata = semigraphics6_fontdata8x12;
@ -931,15 +943,14 @@ mc6847_friend_device::character_map::character_map(const uint8_t *text_fontdata,
color_shift_1 = 6;
color_mask_1 = 0x03;
}
else if (mode & MODE_AS)
else if (((mode & (MODE_INTEXT | MODE_AS)) == MODE_INTEXT) && !is_mc6847t1)
{
// semigraphics 4
fontdata = semigraphics4_fontdata8x12;
character_mask = 0x0F;
color_base_0 = 8;
color_base_1 = 0;
color_shift_1 = 4;
color_mask_1 = 0x07;
// so-called "stripe" mode - this is when INTEXT is specified but we don't have
// an external ROM nor are we on an MC6847T1
fontdata = m_stripes;
character_mask = 0x7F;
color_base_0 = (mode & MODE_CSS ? 14 : 12);
color_base_1 = (mode & MODE_CSS ? 15 : 13);
}
else
{

2
src/devices/video/mc6847.h
View File

@ -109,6 +109,7 @@ protected:
static const uint8_t semigraphics4_fontdata8x12[];
static const uint8_t semigraphics6_fontdata8x12[];
static const uint8_t s68047_fontdata8x12[];
static const uint8_t stripes[];
// pixel definitions
typedef uint32_t pixel_t;
@ -186,6 +187,7 @@ protected:
uint8_t m_text_fontdata_inverse[64*12];
uint8_t m_text_fontdata_lower_case[64*12];
uint8_t m_text_fontdata_lower_case_inverse[64*12];
uint8_t m_stripes[128*12];
// optimized function that tests a single bit
ATTR_FORCE_INLINE pixel_t bit_test(uint8_t data, int shift, pixel_t color_0, pixel_t color_1)