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[FREELDR] Use BIOS font and accelerated text drawing on NEC PC-98

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Both features are switchable via global variables.
This commit is contained in:
Stanislav Motylkov 2020-10-17 00:32:38 +03:00
parent 90a6086f17
commit db1b04340f
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GPG key ID: AFE513258CBA9E92
1 changed files with 125 additions and 0 deletions
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125
boot/freeldr/freeldr/arch/i386/pc98/pc98video.c
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@ -28,6 +28,13 @@ UCHAR TextLines;
#define SCREEN_HEIGHT 400
#define BYTES_PER_SCANLINE (SCREEN_WIDTH / 8)
/* Use BIOS font; set to FALSE for built-in VGA font. */
static BOOLEAN UseCGFont = TRUE;
/* Hardware accelerated text drawing; set to FALSE for non-accelerated
* self-drawing, which will allow more than 8 colors for text though.
* This option is possible only with BIOS fonts enabled. */
static BOOLEAN CGAccelDraw = TRUE;
ULONG VramText;
static ULONG VramPlaneB;
static ULONG VramPlaneG;
@ -232,6 +239,77 @@ Pc98VideoHideShowTextCursor(BOOLEAN Show)
WRITE_GDC_CSRFORM((PUCHAR)GDC1_IO_o_PARAM, &CursorParameters);
}
static
UCHAR
Pc98VideoAttrToGdcAttr(UCHAR Attr)
{
switch (Attr & 0xF)
{
case COLOR_BLACK:
return GDC_ATTR_BLACK;
case COLOR_BLUE:
return GDC_ATTR_BLUE;
case COLOR_GREEN:
case COLOR_LIGHTGREEN:
return GDC_ATTR_GREEN;
case COLOR_CYAN:
case COLOR_GRAY:
case COLOR_DARKGRAY:
case COLOR_WHITE:
return GDC_ATTR_WHITE;
case COLOR_RED:
case COLOR_LIGHTRED:
return GDC_ATTR_RED;
case COLOR_MAGENTA:
case COLOR_LIGHTMAGENTA:
return GDC_ATTR_PURPLE;
case COLOR_BROWN:
case COLOR_YELLOW:
return GDC_ATTR_YELLOW;
case COLOR_LIGHTBLUE:
case COLOR_LIGHTCYAN:
return GDC_ATTR_LIGHTBLUE;
default:
return GDC_ATTR_BLACK;
}
}
static
USHORT
Pc98AsciiToJisX(int Ch)
{
switch (Ch)
{
/* Only characters required for pseudographic are handled here */
case 0x18: return 0x1E;
case 0x19: return 0x1F;
case 0xB3: return 0x260B;
case 0xB6: return 0x4C0B;
case 0xBA: return 0x270B;
case 0xBB: return 0x370B;
case 0xBC: return 0x3F0B;
case 0xBF: return 0x340B;
case 0xC0: return 0x380B;
case 0xC4: return 0x240B;
case 0xC7: return 0x440B;
case 0xC8: return 0x3B0B;
case 0xC9: return 0x330B;
case 0xCD: return 0x250B;
case 0xD9: return 0x3C0B;
case 0xDA: return 0x300B;
case 0xDB: return 0x87;
default: return Ch;
}
}
static
VOID
Pc98VideoTextRamPutChar(int Ch, UCHAR Attr, unsigned X, unsigned Y)
{
*(PUSHORT)(VramText + (X + Y * TextCols) * TEXT_CHAR_SIZE) = Ch;
*(PUCHAR)(VramText + VRAM_TEXT_ATTR_OFFSET + (X + Y * TextCols) * TEXT_CHAR_SIZE) = Pc98VideoAttrToGdcAttr(Attr) | GDC_ATTR_VISIBLE;
}
VOID
Pc98VideoPutChar(int Ch, UCHAR Attr, unsigned X, unsigned Y)
{
@ -242,9 +320,46 @@ Pc98VideoPutChar(int Ch, UCHAR Attr, unsigned X, unsigned Y)
UCHAR I = (Attr & 0x80) ? 0xFF : 0;
ULONG VramOffset = X + (Y * CHAR_HEIGHT) * BYTES_PER_SCANLINE;
PUCHAR FontPtr = BitmapFont8x16 + Ch * 16;
BOOLEAN CGFont = UseCGFont && (Ch != LIGHT_FILL && Ch != MEDIUM_FILL && Ch != DARK_FILL);
if (CGFont)
{
Ch = Pc98AsciiToJisX(Ch);
if (CGAccelDraw)
{
Pc98VideoTextRamPutChar(Ch, Attr, X, Y);
}
else
{
/* Set needed character code to obtain glyph from CG Window */
WRITE_PORT_UCHAR((PUCHAR)KCG_IO_o_CHARCODE_LOW, Ch);
WRITE_PORT_UCHAR((PUCHAR)KCG_IO_o_CHARCODE_HIGH, Ch >> 8);
}
}
else if (UseCGFont && CGAccelDraw)
{
/* Clear character at this place in Text RAM */
Pc98VideoTextRamPutChar(' ', Attr, X, Y);
}
for (Line = 0; Line < CHAR_HEIGHT; Line++)
{
if (CGFont)
{
if (CGAccelDraw)
{
/* Character is already displayed by GDC (Text RAM),
* so display only background for it. */
FontPtr[Line] = 0;
}
else
{
/* Obtain glyph data from CG Window */
WRITE_PORT_UCHAR((PUCHAR)KCG_IO_o_LINE, Line | 0x20);
FontPtr[Line] = READ_PORT_UCHAR((PUCHAR)KCG_IO_i_PATTERN);
}
}
if (Attr & 0x0F)
{
*(PUCHAR)(VramPlaneB + VramOffset + Line * BYTES_PER_SCANLINE) = B | ((Attr & 0x01) ? FontPtr[Line] : 0);
@ -336,4 +451,14 @@ Pc98VideoPrepareForReactOS(VOID)
Int386(0x18, &Regs, &Regs);
Pc98VideoHideShowTextCursor(FALSE);
if (UseCGFont && CGAccelDraw)
{
/* Clear the text screen, resetting to default attributes */
for (USHORT i = 0; i < VRAM_TEXT_SIZE; i += TEXT_CHAR_SIZE)
{
*(PUSHORT)(VramText + i) = ' ';
*(PUCHAR)(VramText + VRAM_TEXT_ATTR_OFFSET + i) = GDC_ATTR_WHITE | GDC_ATTR_VISIBLE;
}
}
}