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fix INT10_GetDACBlock; add gray scale summing (from VGABIOS)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2353
This commit is contained in:
Sebastian Strohhäcker 2005-10-23 19:47:18 +00:00
parent 9175b74b13
commit c614c13e0e
4 changed files with 38 additions and 8 deletions
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21
src/ints/int10.cpp
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@ -176,6 +176,9 @@ static Bitu INT10_Handler(void) {
case 0x1A: /* GET VIDEO DAC COLOR PAGE */
INT10_GetDACPage(&reg_bl,&reg_bh);
break;
case 0x1B: /* PERFORM GRAY-SCALE SUMMING */
INT10_PerformGrayScaleSumming(reg_bx,reg_cx);
break;
default:
LOG(LOG_INT10,LOG_ERROR)("Function 10:Unhandled EGA/VGA Palette Function %2X",reg_al);
}
@ -274,12 +277,18 @@ graphics_chars:
if (machine<MCH_VGA) break;
switch (reg_bl) {
case 0x10: /* Get EGA Information */
{
reg_bh=(real_readw(BIOSMEM_SEG,BIOSMEM_CRTC_ADDRESS)==0x3B4);
reg_bl=3; //256 kb
reg_cx=real_readb(BIOSMEM_SEG,BIOSMEM_SWITCHES) & 0x0F;
break;
}
reg_bh=(real_readw(BIOSMEM_SEG,BIOSMEM_CRTC_ADDRESS)==0x3B4);
reg_bl=3; //256 kb
reg_cx=real_readb(BIOSMEM_SEG,BIOSMEM_SWITCHES) & 0x0F;
break;
case 0x33: /* SWITCH GRAY-SCALE SUMMING */
{
Bit8u temp = real_readb(BIOSMEM_SEG,BIOSMEM_MODESET_CTL) & 0xfd;
if (!(reg_al&1)) temp|=2; // enable if al=0
real_writeb(BIOSMEM_SEG,BIOSMEM_MODESET_CTL,temp);
reg_al=0x12;
break;
}
case 0x34: /* ALTERNATE FUNCTION SELECT (VGA) - CURSOR EMULATION */
{
// bit 0: 0=enable, 1=disable