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Cleaned up method determine_screen_dimensions(): no special cases handling needed.

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This commit is contained in:
Volker Ruppert 2021-06-08 19:06:22 +00:00
parent d0fef2e502
commit 277830ca07
1 changed files with 4 additions and 28 deletions
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32
bochs/iodev/display/vgacore.cc
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@ -358,34 +358,10 @@ void bx_vgacore_c::determine_screen_dimensions(unsigned *piHeight, unsigned *piW
v = (AI[18] | ((AI[7] & 0x02) << 7) | ((AI[7] & 0x40) << 3)) + 1;
#undef AI
if (BX_VGA_THIS s.graphics_ctrl.shift_reg == 0) {
*piWidth = 640;
*piHeight = 480;
if (BX_VGA_THIS s.CRTC.reg[6] == 0xBF) {
if (BX_VGA_THIS s.CRTC.reg[23] == 0xA3 &&
BX_VGA_THIS s.CRTC.reg[20] == 0x40 &&
BX_VGA_THIS s.CRTC.reg[9] == 0x41) {
*piWidth = 320;
*piHeight = 240;
} else {
if (BX_VGA_THIS s.x_dotclockdiv2) h <<= 1;
*piWidth = h;
*piHeight = v;
}
} else if ((h >= 640) && (v >= 400)) {
if (BX_VGA_THIS s.ext_y_dblsize) v <<= 1;
*piWidth = h;
*piHeight = v;
}
} else if (BX_VGA_THIS s.graphics_ctrl.shift_reg == 2) {
*piWidth = h;
*piHeight = v;
} else {
if (BX_VGA_THIS s.x_dotclockdiv2) h <<= 1;
*piWidth = h;
*piHeight = v;
}
if (BX_VGA_THIS s.x_dotclockdiv2) h <<= 1;
if (BX_VGA_THIS s.ext_y_dblsize) v <<= 1;
*piWidth = h;
*piHeight = v;
}
void bx_vgacore_c::get_crtc_params(bx_crtc_params_t *crtcp, Bit32u *vclock)