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Add video blanking in vgaonly mode. Used by Alien Carnage and others.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3568
This commit is contained in:
Ralf Grillenberger 2010-04-04 18:43:04 +00:00
parent 13ea835d96
commit 6be8956f46
6 changed files with 19 additions and 13 deletions
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7
include/vga.h
View file

@ -262,7 +262,12 @@ typedef struct {
Bit8u color_plane_enable;
Bit8u color_select;
Bit8u index;
Bit8u enabled;
Bit8u disabled; // Used for disabling the screen.
// Bit0: screen disabled by attribute controller index
// Bit1: screen disabled by sequencer index 1 bit 5
// These are put together in one variable for performance reasons:
// the line drawing function is called maybe 60*480=28800 times/s,
// and we only need to check one variable for zero this way.
} VGA_Attr;
typedef struct {

7
src/hardware/vga_attr.cpp
View file

@ -46,7 +46,7 @@ void VGA_ATTR_SetPalette(Bit8u index,Bit8u val) {
Bitu read_p3c0(Bitu /*port*/,Bitu /*iolen*/) {
// Wcharts, Win 3.11 & 95 SVGA
Bitu retval = attr(index) & 0x1f;
if (attr(enabled)) retval |= 0x20;
if (!(attr(disabled) & 0x1)) retval |= 0x20;
return retval;
}
@ -54,7 +54,8 @@ void write_p3c0(Bitu /*port*/,Bitu val,Bitu iolen) {
if (!vga.internal.attrindex) {
attr(index)=val & 0x1F;
vga.internal.attrindex=true;
attr(enabled)=val & 0x20;
if (val & 0x20) attr(disabled) &= ~1;
else attr(disabled) |= 1;
/*
0-4 Address of data register to write to port 3C0h or read from port 3C1h
5 If set screen output is enabled and the palette can not be modified,
@ -69,7 +70,7 @@ void write_p3c0(Bitu /*port*/,Bitu val,Bitu iolen) {
case 0x04: case 0x05: case 0x06: case 0x07:
case 0x08: case 0x09: case 0x0a: case 0x0b:
case 0x0c: case 0x0d: case 0x0e: case 0x0f:
if (!attr(enabled)) VGA_ATTR_SetPalette(attr(index),(Bit8u)val);
if (attr(disabled) & 0x1) VGA_ATTR_SetPalette(attr(index),(Bit8u)val);
/*
0-5 Index into the 256 color DAC table. May be modified by 3C0h index
10h and 14h.

12
src/hardware/vga_draw.cpp
View file

@ -637,15 +637,13 @@ static void VGA_ProcessSplit() {
}
static void VGA_DrawSingleLine(Bitu /*blah*/) {
if (vga.attr.enabled) {
Bit8u * data=VGA_DrawLine( vga.draw.address, vga.draw.address_line );
RENDER_DrawLine(data);
} else {
// else draw overscan color line
// TODO: black line should be good enough for now
// (DoWhackaDo)
if (GCC_UNLIKELY(vga.attr.disabled)) {
// draw blanked line (DoWhackaDo, Alien Carnage, TV sports Football)
memset(TempLine, 0, sizeof(TempLine));
RENDER_DrawLine(TempLine);
} else {
Bit8u * data=VGA_DrawLine( vga.draw.address, vga.draw.address_line );
RENDER_DrawLine(data);
}
vga.draw.address_line++;

2
src/hardware/vga_other.cpp
View file

@ -522,7 +522,7 @@ Bitu read_herc_status(Bitu /*port*/,Bitu /*iolen*/) {
void VGA_SetupOther(void) {
Bitu i;
memset( &vga.tandy, 0, sizeof( vga.tandy ));
vga.attr.enabled = true;
vga.attr.disabled = 0;
vga.config.bytes_skip=0;
//Initialize values common for most machines, can be overwritten

2
src/hardware/vga_s3.cpp
View file

@ -355,7 +355,7 @@ Bitu SVGA_S3_ReadCRTC( Bitu reg, Bitu iolen) {
switch (reg) {
case 0x24: /* attribute controller index (read only) */
case 0x26:
return (vga.attr.enabled?0x20:0x00) | (vga.attr.index&0x1f);
return ((vga.attr.disabled & 1)?0x00:0x20) | (vga.attr.index & 0x1f);
case 0x2d: /* Extended Chip ID (high byte of PCI device ID) */
return 0x88;
case 0x2e: /* New Chip ID (low byte of PCI device ID) */

2
src/hardware/vga_seq.cpp
View file

@ -47,6 +47,8 @@ void write_p3c5(Bitu /*port*/,Bitu val,Bitu iolen) {
} else {
seq(clocking_mode)=val;
}
if (val & 0x20) vga.attr.disabled |= 0x2;
else vga.attr.disabled &= ~0x2;
}
/* TODO Figure this out :)
0 If set character clocks are 8 dots wide, else 9.