1997/0327/pc/vgaark2000pv.c (diff list | history)

pc/vgaark2000pv.c on 1995/0512
1995/0512		#include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "../port/error.h" #include <libg.h> #include "screen.h" #include "vga.h"
1995/0516		extern Bitmap gscreen; extern Cursor curcursor; static Lock ark2000pvlock; static ulong storage; static Point hotpoint;
1995/0512		static void
1995/0516		setark2000pvpage(int page)
1995/0512		{ vgaxo(Seqx, 0x15, page); vgaxo(Seqx, 0x16, page); }
1995/0516		static void disable(void) { uchar seq20;
1997/0327		lock(&ark2000pvlock);
1995/0516		seq20 = vgaxi(Seqx, 0x20) & ~0x08; vgaxo(Seqx, 0x20, seq20);
1997/0327		unlock(&ark2000pvlock);
1995/0516		} static void enable(void) { uchar seq20;
1997/0327		lock(&ark2000pvlock);
1995/0516		/* * Disable the cursor then configure for X-Windows style,
1996/0216		* 32x32 and 4/8-bit colour depth.
1995/0516		* Set cursor colours for 4/8-bit. */ seq20 = vgaxi(Seqx, 0x20) & ~0x1F; vgaxo(Seqx, 0x20, seq20);
1996/0216		seq20 |= 0x18;
1995/0516		vgaxo(Seqx, 0x26, Pwhite); vgaxo(Seqx, 0x27, Pwhite); vgaxo(Seqx, 0x28, Pwhite); vgaxo(Seqx, 0x29, Pblack); vgaxo(Seqx, 0x2A, Pblack); vgaxo(Seqx, 0x2B, Pblack); /*
1996/0216		* Cursor storage is a 256 byte or 1Kb block located in the last * 16Kb of video memory. Crt25 is the index of which block.
1995/0516		*/ storage = (vgaxi(Seqx, 0x10)>>6) & 0x03; storage = (1024*1024)<<storage;
1996/0216		storage -= 256; vgaxo(Seqx, 0x25, 0x3F);
1995/0516		/* * Enable the cursor. */ vgaxo(Seqx, 0x20, seq20);
1997/0327		unlock(&ark2000pvlock);
1995/0516		} static void load(Cursor *c) {
1996/0216		uchar *p;
1995/0516		int x, y; /* * Lock the display memory so we can update the * cursor bitmap if necessary. * If it's the same as the last cursor we loaded, * just make sure it's enabled. */ lock(&ark2000pvlock); if(memcmp(c, &curcursor, sizeof(Cursor)) == 0){
1996/0216		vgaxo(Seqx, 0x20, vgaxi(Seqx, 0x20)|0x08);
1995/0516		unlock(&ark2000pvlock); return; } memmove(&curcursor, c, sizeof(Cursor)); /* * Is linear addressing turned on? This will determine * how we access the cursor storage. */ if(vgaxi(Seqx, 0x10) & 0x10) p = ((uchar*)gscreen.base) + storage; else { setark2000pvpage(storage>>16); p = ((uchar*)gscreen.base) + (storage & 0xFFFF); } /* * The cursor is set in X11 mode which gives the following * truth table: * and xor colour * 0 0 underlying pixel colour * 0 1 underlying pixel colour * 1 0 background colour * 1 1 foreground colour
1996/0216		* Put the cursor into the top-left of the 32x32 array.
1995/0516		* The manual doesn't say what the data layout in memory is - * this worked out by trial and error. */
1996/0216		for(y = 0; y < 32; y++){ for(x = 0; x < 32/8; x++){
1995/0516		if(x < 16/8 && y < 16){ *p++ = c->clr[2*y + x]|c->set[2*y + x]; *p++ = c->set[2*y + x]; } else {
1995/0808		*p++ = 0x00; *p++ = 0x00;
1995/0516		} } } /* * Set the cursor hotpoint and enable the cursor. */ hotpoint = c->offset; unlock(&ark2000pvlock); } static int move(Point p) { int x, xo, y, yo; if(canlock(&ark2000pvlock) == 0) return 1; /* * Mustn't position the cursor offscreen even partially, * or it might disappear. Therefore, if x or y is -ve, adjust the * cursor origins instead. */ if((x = p.x+hotpoint.x) < 0){ xo = -x;
1995/0822		x = 0;
1995/0516		} else
1995/0822		xo = 0;
1995/0516		if((y = p.y+hotpoint.y) < 0){ yo = -y;
1995/0822		y = 0;
1995/0516		} else
1995/0822		yo = 0;
1995/0516		/* * Load the new values. */ vgaxo(Seqx, 0x2C, xo); vgaxo(Seqx, 0x2D, yo); vgaxo(Seqx, 0x21, (x>>8) & 0x0F); vgaxo(Seqx, 0x22, x & 0xFF); vgaxo(Seqx, 0x23, (y>>8) & 0x0F); vgaxo(Seqx, 0x24, y & 0xFF); unlock(&ark2000pvlock); return 0; }
1996/0215		static Hwgc ark2000pvhwgc = {
1995/0516		"ark2000pvhwgc", enable, load, move, disable, 0, }; static void ark2000pvpage(int page) {
1997/0327		lock(&ark2000pvlock); setark2000pvpage(page); unlock(&ark2000pvlock);
1995/0516		}
1995/0512		static Vgac ark2000pv = { "ark2000pv", ark2000pvpage, 0, }; void vgaark2000pvlink(void) { addvgaclink(&ark2000pv);
1995/0516		addhwgclink(&ark2000pvhwgc);
1995/0512		}