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Horizontal pixel panning implemented in VGA graphics mode.

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This change should fix issue #114.
Added BX_ERROR for two other unimplemented features.
This commit is contained in:
Volker Ruppert 2023-11-24 16:54:15 +01:00
parent e9cd258882
commit 99629f9207
1 changed files with 10 additions and 1 deletions
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11
bochs/iodev/display/vgacore.cc
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@ -2,7 +2,7 @@
// $Id$
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001-2021 The Bochs Project
// Copyright (C) 2001-2023 The Bochs Project
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
@ -1182,6 +1182,12 @@ void bx_vgacore_c::write(Bit32u address, Bit32u value, unsigned io_len, bool no_
break;
case 0x08:
// Vertical pel panning change
if (BX_VGA_THIS s.graphics_ctrl.graphics_alpha && ((BX_VGA_THIS s.CRTC.reg[0x08] & 0x1f) > 0)) {
BX_ERROR(("CRTC: vertical pel panning in graphics mode not implemented yet"));
}
if ((BX_VGA_THIS s.CRTC.reg[0x08] & 0x60) > 0) {
BX_ERROR(("CRTC: byte panning not implemented yet"));
}
needs_update = 1;
break;
case 0x09:
@ -1273,6 +1279,9 @@ Bit8u bx_vgacore_c::get_vga_pixel(Bit16u x, Bit16u y, Bit16u saddr, Bit16u lc, b
Bit8u attribute, bit_no, palette_reg_val, DAC_regno;
Bit32u byte_offset;
if ((y <= lc) || !BX_VGA_THIS s.attribute_ctrl.mode_ctrl.pixel_panning_compat) {
x += BX_VGA_THIS s.attribute_ctrl.horiz_pel_panning;
}
if (BX_VGA_THIS s.x_dotclockdiv2) x >>= 1;
bit_no = 7 - (x % 8);
if (y > lc) {