From d4e99b8dbde227f8ee141e961e69d761e573efaf Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Sat, 9 Oct 1999 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1999-10-09

---
 pc/devvga.c    | 14 ++++++++++++++
 pc/screen.h    |  3 +++
 pc/vgat2r4.c   | 39 +++++++++++++++++++++++++++++----------
 port/devdraw.c |  6 ++++++
 4 files changed, 52 insertions(+), 10 deletions(-)

diff --git a/pc/devvga.c b/pc/devvga.c
index 814445d971fcd292dfa7b4588d0caf90a503ad54..195f7e820795220171e7c9cef3d409d29d8fadf8 100644
--- a/pc/devvga.c
+++ b/pc/devvga.c
@@ -129,6 +129,8 @@ vgaread(Chan* c, void* a, long n, vlong off)
 	return 0;
 }
 
+static char Ebusy[] = "vga already configured";
+
 static void
 vgactl(char* a)
 {
@@ -195,6 +197,9 @@ vgactl(char* a)
 	else if(strcmp(field[0], "size") == 0){
 		if(n < 3)
 			error(Ebadarg);
+		if(drawhasclients())
+			error(Ebusy);
+
 		x = strtoul(field[1], &p, 0);
 		if(x == 0 || x > 2048)
 			error(Ebadarg);
@@ -264,8 +269,17 @@ vgactl(char* a)
 		return;
 	}
 	else if(strcmp(field[0], "drawinit") == 0){
+		/*
+		 * This is a separate message, but first we need to make
+		 * aux/vga send it; once everyone has the new vga, we
+		 * can take the drawinit stuff out of hwgc.
+		 */
+
+		/*
 		if(scr && scr->dev && scr->dev->drawinit)
 			scr->dev->drawinit(scr);
+		*/
+
 		return;
 	}
 	else if(strcmp(field[0], "linear") == 0){
diff --git a/pc/screen.h b/pc/screen.h
index 68b7ad566b5c202dda6c3e9cb2fc13eea40ccca0..863c4543be10135514798d73c525d9552ba2dec6 100644
--- a/pc/screen.h
+++ b/pc/screen.h
@@ -131,7 +131,10 @@ extern void	setcursor(Cursor*);
 extern int	screensize(int, int, int, ulong);
 extern int	screenaperture(int, int);
 extern Rectangle physgscreenr;	/* actual monitor size */
+
+/* devdraw.c */
 extern void	deletescreenimage(void);
+extern int		drawhasclients(void);
 
 /* vga.c */
 extern void	vgascreenwin(VGAscr*);
diff --git a/pc/vgat2r4.c b/pc/vgat2r4.c
index 5db33da178ca1fbc20d1a7148605447b846c41bc..21ba69226c6d9f61f664f831aaa1d4aacea471fb 100644
--- a/pc/vgat2r4.c
+++ b/pc/vgat2r4.c
@@ -45,8 +45,8 @@ enum {						/* index registers */
 
 	CursorArray	= 0x100,
 
-	CursorMode32x32	= 0x03,
-	CursorMode64x64	= 0x07,
+	CursorMode32x32	= 0x23,
+	CursorMode64x64	= 0x27,
 	CursorMode	= CursorMode64x64,
 };
 
@@ -185,9 +185,9 @@ t2r4curdisable(VGAscr* scr)
 static void
 t2r4curload(VGAscr* scr, Cursor* curs)
 {
-	int x, y;
-	ulong *mmio;
-	uchar *data, p, p0, p1;
+	uchar *data;
+	int x, y, zoom;
+	ulong clr, *mmio, pixels, set;
 
 	mmio = scr->mmio;
 	if(mmio == 0)
@@ -219,13 +219,32 @@ t2r4curload(VGAscr* scr, Cursor* curs)
 	 *	 1  0	cursor colour 1
 	 *	 1  1	cursor colour 2
 	 * Put the cursor into the top-left of the array.
+	 *
+	 * Although this looks a lot like the IBM RGB524 cursor, the
+	 * scanlines appear to be twice as long as they should be and
+	 * some of the other features are missing.
 	 */
+	if(mmio[Zoom] & 0x0F)
+		zoom = 32;
+	else
+		zoom = 16;
 	data = (uchar*)&mmio[Data];
-	for(y = 0; y < 32; y++){
-		*data = 0xFF;
-		*data = 0xAA;
-		*data = 0xFF;
-		*data = 0xAA;
+	for(y = 0; y < zoom; y++){
+		clr = (curs->clr[2*y]<<8)|curs->clr[y*2 + 1];
+		set = (curs->set[2*y]<<8)|curs->set[y*2 + 1];
+		pixels = 0;
+		for(x = 0; x < 16; x++){
+			if(set & (1<<x))
+				pixels |= 0x03<<(x*2);
+			else if(clr & (1<<x))
+				pixels |= 0x02<<(x*2);
+		}
+
+		*data = pixels>>24;
+		*data = pixels>>16;
+		*data = pixels>>8;
+		*data = pixels;
+
 		*data = 0x00;
 		*data = 0x00;
 		*data = 0x00;
diff --git a/port/devdraw.c b/port/devdraw.c
index 5da8145ddc745297ee1f1d27abc9854bad838fb5..cf20cd806a215a49ba2efde3e364a61f6cc3ebbb 100644
--- a/port/devdraw.c
+++ b/port/devdraw.c
@@ -723,6 +723,12 @@ drawnewclient(void)
 	return cl;
 }
 
+int
+drawhasclients(void)
+{
+	return sdraw.nclient != 0;
+}
+
 Client*
 drawclientofpath(ulong path)
 {