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Add patch 1340216 from vasyl. Speeds up the new and slower chain4 mode a bit.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2361
This commit is contained in:
Peter Veenstra 2005-10-31 10:24:56 +00:00
parent 5783f7ff82
commit 48ca454da6
2 changed files with 21 additions and 14 deletions
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30
src/hardware/vga_draw.cpp
View file

@ -27,8 +27,10 @@
#define VGA_PARTS 4
typedef Bit8u * (* VGA_Line_Handler)(Bitu vidstart,Bitu panning,Bitu line);
typedef void (* VGA_FrameStart_Handler)();
static VGA_Line_Handler VGA_DrawLine;
static VGA_FrameStart_Handler VGA_FrameStart;
static Bit8u TempLine[1280];
static Bit8u * VGA_Draw_1BPP_Line(Bitu vidstart,Bitu panning,Bitu line) {
@ -132,19 +134,14 @@ static Bit8u * VGA_Draw_VGA_Line(Bitu vidstart,Bitu panning,Bitu line) {
}
static Bit8u * VGA_Draw_VGAChained_Line(Bitu vidstart,Bitu panning,Bitu line) {
if(vga.config.compatible_chain4) {
if(vga.crtc.underline_location & 0x40) {
Bitu readindex = vidstart*4+panning;
Bit32u* draw = (Bit32u*)TempLine;
for(Bitu x=0;x<vga.draw.blocks*4;x++) {
*draw = vga.mem.latched[readindex&0xfffc].d;
draw ++;
readindex += 4;
}
return TempLine;
}
}
return &vga.mem.linear[vidstart*4+panning];
return &vga.mem.linear[512*1024+((vidstart*4+panning)&0xffff)];
}
static void VGA_StartFrame_VGA() {
if(vga.config.compatible_chain4 && (vga.crtc.underline_location & 0x40))
VGA_DrawLine=VGA_Draw_VGAChained_Line;
else
VGA_DrawLine = VGA_Draw_VGA_Line;
}
static Bit8u * VGA_Draw_VGA_Line_HWMouse(Bitu vidstart, Bitu panning, Bitu line) {
@ -286,6 +283,8 @@ void VGA_SetBlinking(Bitu enabled) {
}
static void VGA_VerticalTimer(Bitu val) {
if (VGA_FrameStart)
VGA_FrameStart();
vga.config.retrace=false;
PIC_AddEvent(VGA_VerticalTimer,vga.draw.delay.vtotal);
PIC_AddEvent(VGA_VerticalDisplayEnd,vga.draw.delay.vend);
@ -450,11 +449,14 @@ void VGA_SetupDrawing(Bitu val) {
Bitu height=vdispend;
bool doubleheight=false;
bool doublewidth=false;
VGA_FrameStart = NULL;
switch (vga.mode) {
case M_VGA:
doublewidth=true;
width<<=2;
VGA_DrawLine=VGA_Draw_VGAChained_Line;
// Proper line handler is selected at the beginning of the frame
// VGA_DrawLine=VGA_Draw_VGAChained_Line;
VGA_FrameStart=VGA_StartFrame_VGA;
break;
case M_LIN8:
width<<=3;

5
src/hardware/vga_memory.cpp
View file

@ -49,6 +49,11 @@ static Bitu VGA_Chain4ReadHandler(PhysPt start) {
static void VGA_Chain4WriteHandler(PhysPt start, Bit8u val) {
// No need to check for compatible chains here, this one is only enabled if that bit is set
vga.mem.linear[((start&~3)<<2)|(start&3)] = val;
// Linearized version for faster rendering
vga.mem.linear[512*1024+start] = val;
// And replicate the first line
if (start < 320)
vga.mem.linear[512*1024+start+64*1024] = val;
}
//Nice one from DosEmu