1 files changed, 410 insertions, 0 deletions
diff --git a/os/pc/screen.c b/os/pc/screen.c
new file mode 100644
index 00000000..e879b050
--- /dev/null
+++ b/os/pc/screen.c
@@ -0,0 +1,410 @@
+#include "u.h"
+#include "../port/lib.h"
+#include "mem.h"
+#include "dat.h"
+#include "fns.h"
+#include "io.h"
+#include "ureg.h"
+#include "../port/error.h"
+
+#include <draw.h>
+#include <memdraw.h>
+#include <cursor.h>
+#include "screen.h"
+
+#define RGB2K(r,g,b)	((156763*(r)+307758*(g)+59769*(b))>>19)
+
+Point ZP = {0, 0};
+
+Rectangle physgscreenr;
+Cursorinfo cursor;	/* TO DO */
+
+Memdata gscreendata;
+Memimage *gscreen;
+
+VGAscr vgascreen[1];
+
+Cursor	arrow = {
+	{ -1, -1 },
+	{ 0xFF, 0xFF, 0x80, 0x01, 0x80, 0x02, 0x80, 0x0C, 
+	  0x80, 0x10, 0x80, 0x10, 0x80, 0x08, 0x80, 0x04, 
+	  0x80, 0x02, 0x80, 0x01, 0x80, 0x02, 0x8C, 0x04, 
+	  0x92, 0x08, 0x91, 0x10, 0xA0, 0xA0, 0xC0, 0x40, 
+	},
+	{ 0x00, 0x00, 0x7F, 0xFE, 0x7F, 0xFC, 0x7F, 0xF0, 
+	  0x7F, 0xE0, 0x7F, 0xE0, 0x7F, 0xF0, 0x7F, 0xF8, 
+	  0x7F, 0xFC, 0x7F, 0xFE, 0x7F, 0xFC, 0x73, 0xF8, 
+	  0x61, 0xF0, 0x60, 0xE0, 0x40, 0x40, 0x00, 0x00, 
+	},
+};
+
+int
+screensize(int x, int y, int z, ulong chan)
+{
+	VGAscr *scr;
+
+	memimageinit();
+	scr = &vgascreen[0];
+
+	/*
+	 * BUG: need to check if any xalloc'ed memory needs to
+	 * be given back if aperture is set.
+	 */
+	if(scr->aperture == 0){
+		int width = (x*z)/BI2WD;
+
+		gscreendata.bdata = xalloc(width*BY2WD*y);
+		if(gscreendata.bdata == 0)
+			error("screensize: vga soft memory");
+/*		memset(gscreendata.bdata, 0x72, width*BY2WD*y);	/* not really black */
+		scr->useflush = 1;
+		scr->aperture = VGAMEM();
+		scr->apsize = 1<<16;
+	}
+	else
+		gscreendata.bdata = KADDR(scr->aperture);
+
+	if(gscreen)
+		freememimage(gscreen);
+
+	gscreen = allocmemimaged(Rect(0,0,x,y), chan, &gscreendata);
+	vgaimageinit(chan);
+	if(gscreen == nil)
+		return -1;
+
+	if(scr->dev && scr->dev->flush)
+		scr->useflush = 1;
+
+	scr->palettedepth = 6;	/* default */
+	scr->gscreendata = &gscreendata;
+	scr->memdefont = getmemdefont();
+	scr->gscreen = gscreen;
+
+	physgscreenr = gscreen->r;
+
+	drawcmap();
+	return 0;
+}
+
+int
+screenaperture(int size, int align)
+{
+	VGAscr *scr;
+	ulong aperture;
+
+	scr = &vgascreen[0];
+
+	if(size == 0){
+		if(scr->aperture && scr->isupamem)
+			upafree(scr->aperture, scr->apsize);
+		scr->aperture = 0;
+		scr->isupamem = 0;
+		return 0;
+	}
+	if(scr->dev && scr->dev->linear){
+		aperture = scr->dev->linear(scr, &size, &align);
+		if(aperture == 0)
+			return 1;
+	}else{
+		aperture = upamalloc(0, size, align);
+		if(aperture == 0)
+			return 1;
+
+		if(scr->aperture && scr->isupamem)
+			upafree(scr->aperture, scr->apsize);
+		scr->isupamem = 1;
+	}
+
+	scr->aperture = aperture;
+	scr->apsize = size;
+
+	return 0;
+}
+
+uchar*
+attachscreen(Rectangle* r, ulong* chan, int* d, int* width, int *softscreen)
+{
+	VGAscr *scr;
+
+	scr = &vgascreen[0];
+	if(scr->gscreen == nil || scr->gscreendata == nil)
+		return nil;
+
+	*r = scr->gscreen->clipr;
+	*chan = scr->gscreen->chan;
+	*d = scr->gscreen->depth;
+	*width = scr->gscreen->width;
+	*softscreen = scr->useflush;
+
+	return scr->gscreendata->bdata;
+}
+
+/*
+ * It would be fair to say that this doesn't work for >8-bit screens.
+ */
+void
+flushmemscreen(Rectangle r)
+{
+	VGAscr *scr;
+	uchar *sp, *disp, *sdisp, *edisp;
+	int y, len, incs, off, page;
+
+	scr = &vgascreen[0];
+	if(scr->dev && scr->dev->flush){
+		scr->dev->flush(scr, r);
+		return;
+	}
+	if(scr->gscreen == nil || scr->useflush == 0)
+		return;
+	if(scr->dev == nil || scr->dev->page == nil)
+		return;
+
+	if(rectclip(&r, scr->gscreen->r) == 0)
+		return;
+
+	incs = scr->gscreen->width * BY2WD;
+
+	switch(scr->gscreen->depth){
+	default:
+		len = 0;
+		panic("flushmemscreen: depth\n");
+		break;
+	case 8:
+		len = Dx(r);
+		break;
+	}
+	if(len < 1)
+		return;
+
+	off = r.min.y*scr->gscreen->width*BY2WD+(r.min.x*scr->gscreen->depth)/8;
+	page = off/scr->apsize;
+	off %= scr->apsize;
+	disp = KADDR(scr->aperture);
+	sdisp = disp+off;
+	edisp = disp+scr->apsize;
+
+	off = r.min.y*scr->gscreen->width*BY2WD+(r.min.x*scr->gscreen->depth)/8;
+
+	sp = scr->gscreendata->bdata + off;
+
+	scr->dev->page(scr, page);
+	for(y = r.min.y; y < r.max.y; y++) {
+		if(sdisp + incs < edisp) {
+			memmove(sdisp, sp, len);
+			sp += incs;
+			sdisp += incs;
+		}
+		else {
+			off = edisp - sdisp;
+			page++;
+			if(off <= len){
+				if(off > 0)
+					memmove(sdisp, sp, off);
+				scr->dev->page(scr, page);
+				if(len - off > 0)
+					memmove(disp, sp+off, len - off);
+			}
+			else {
+				memmove(sdisp, sp, len);
+				scr->dev->page(scr, page);
+			}
+			sp += incs;
+			sdisp += incs - scr->apsize;
+		}
+	}
+}
+
+void
+getcolor(ulong p, ulong* pr, ulong* pg, ulong* pb)
+{
+	VGAscr *scr;
+	ulong x;
+
+	scr = &vgascreen[0];
+	if(scr->gscreen == nil)
+		return;
+
+	switch(scr->gscreen->depth){
+	default:
+		x = 0x0F;
+		break;
+	case 8:
+		x = 0xFF;
+		break;
+	}
+	p &= x;
+
+	lock(&cursor);
+	*pr = scr->colormap[p][0];
+	*pg = scr->colormap[p][1];
+	*pb = scr->colormap[p][2];
+	unlock(&cursor);
+}
+
+int
+setpalette(ulong p, ulong r, ulong g, ulong b)
+{
+	VGAscr *scr;
+	int d;
+
+	scr = &vgascreen[0];
+	d = scr->palettedepth;
+
+	lock(&cursor);
+	scr->colormap[p][0] = r;
+	scr->colormap[p][1] = g;
+	scr->colormap[p][2] = b;
+	vgao(PaddrW, p);
+	vgao(Pdata, r>>(32-d));
+	vgao(Pdata, g>>(32-d));
+	vgao(Pdata, b>>(32-d));
+	unlock(&cursor);
+
+	return ~0;
+}
+
+/*
+ * On some video cards (e.g. Mach64), the palette is used as the 
+ * DAC registers for >8-bit modes.  We don't want to set them when the user
+ * is trying to set a colormap and the card is in one of these modes.
+ */
+int
+setcolor(ulong p, ulong r, ulong g, ulong b)
+{
+	VGAscr *scr;
+	int x;
+
+	scr = &vgascreen[0];
+	if(scr->gscreen == nil)
+		return 0;
+
+	switch(scr->gscreen->depth){
+	case 1:
+	case 2:
+	case 4:
+		x = 0x0F;
+		break;
+	case 8:
+		x = 0xFF;
+		break;
+	default:
+		return 0;
+	}
+	p &= x;
+
+	return setpalette(p, r, g, b);
+}
+
+int
+cursoron(int dolock)
+{
+	VGAscr *scr;
+	int v;
+
+	scr = &vgascreen[0];
+	if(scr->cur == nil || scr->cur->move == nil)
+		return 0;
+
+	if(dolock)
+		lock(&cursor);
+	v = scr->cur->move(scr, mousexy());
+	if(dolock)
+		unlock(&cursor);
+
+	return v;
+}
+
+void
+cursoroff(int)
+{
+}
+
+void
+setcursor(Cursor* curs)
+{
+	VGAscr *scr;
+
+	scr = &vgascreen[0];
+	if(scr->cur == nil || scr->cur->load == nil)
+		return;
+
+	scr->cur->load(scr, curs);
+}
+
+int hwaccel = 1;
+int hwblank = 0;	/* turned on by drivers that are known good */
+int panning = 0;
+
+int
+hwdraw(Memdrawparam *par)
+{
+	VGAscr *scr;
+	Memimage *dst, *src;
+	int m;
+
+	if(hwaccel == 0)
+		return 0;
+
+	dst = par->dst;
+	scr = &vgascreen[0];
+	if(dst == nil || dst->data == nil)
+		return 0;
+
+	if(dst->data->bdata != gscreendata.bdata)
+		return 0;
+
+	if(scr->fill==nil && scr->scroll==nil)
+		return 0;
+
+	/*
+	 * If we have an opaque mask and source is one opaque
+	 * pixel we can convert to the destination format and just
+	 * replicate with memset.
+	 */
+	m = Simplesrc|Simplemask|Fullmask;
+	if(scr->fill
+	&& (par->state&m)==m
+	&& ((par->srgba&0xFF) == 0xFF)
+	&& (par->op&S) == S)
+		return scr->fill(scr, par->r, par->sdval);
+
+	/*
+	 * If no source alpha, an opaque mask, we can just copy the
+	 * source onto the destination.  If the channels are the same and
+	 * the source is not replicated, memmove suffices.
+	 */
+	m = Simplemask|Fullmask;
+	src = par->src;
+	if(scr->scroll
+	&& src->data->bdata==dst->data->bdata
+	&& !(src->flags&Falpha)
+	&& (par->state&m)==m
+	&& (par->op&S) == S)
+		return scr->scroll(scr, par->r, par->sr);
+
+	return 0;	
+}
+
+void
+blankscreen(int blank)
+{
+	VGAscr *scr;
+
+	scr = &vgascreen[0];
+	if(hwblank){
+		if(scr->blank)
+			scr->blank(scr, blank);
+		else
+			vgablank(scr, blank);
+	}
+}
+
+void
+cursorenable(void)
+{
+}
+
+void
+cursordisable(void)
+{
+}