1/*
2	Haiku S3 Virge driver adapted from the X.org Virge driver.
3
4	Copyright (C) 1994-1999 The XFree86 Project, Inc.	All Rights Reserved.
5
6	Copyright 2007-2008 Haiku, Inc.  All rights reserved.
7	Distributed under the terms of the MIT license.
8
9	Authors:
10	Gerald Zajac 2007-2008
11*/
12
13#include "accel.h"
14#include "virge.h"
15
16
17
18void
19Virge_ShowCursor(bool bShow)
20{
21	// Turn cursor on/off.
22
23	WriteCrtcReg(0x45, bShow ? 0x01 : 0x00, 0x01);
24}
25
26
27void
28Virge_SetCursorPosition(int x, int y)
29{
30	uint8 xOffset = 0;
31	uint8 yOffset = 0;
32
33	// xOffset & yOffset are used for displaying partial cursors on screen edges.
34
35	if (x < 0) {
36		xOffset = (( -x) & 0xfe);
37		x = 0;
38	}
39
40	if (y < 0) {
41		yOffset = (( -y) & 0xfe);
42		y = 0;
43	}
44
45	// Note: when setting the cursor position, register 48 must be set last
46	// since setting register 48 activates the new cursor position.
47
48	WriteCrtcReg( 0x4e, xOffset );
49	WriteCrtcReg( 0x4f, yOffset );
50
51	WriteCrtcReg( 0x47, (x & 0xff) );
52	WriteCrtcReg( 0x46, (x & 0x0700) >> 8 );
53
54	WriteCrtcReg( 0x49, (y & 0xff) );
55	WriteCrtcReg( 0x48, (y & 0x0700) >> 8 );
56}
57
58
59bool
60Virge_LoadCursorImage(int width, int height, uint8* andMask, uint8* xorMask)
61{
62	SharedInfo& si = *gInfo.sharedInfo;
63
64	if (andMask == NULL || xorMask == NULL)
65		return false;
66
67	// Initialize hardware cursor to be completely transparent.
68
69	uint16* fbCursor16 = (uint16*)((addr_t)si.videoMemAddr + si.cursorOffset);
70
71	for (int i = 0; i < CURSOR_BYTES; i += 4) {
72		*fbCursor16++ = ~0;		// and bits
73		*fbCursor16++ = 0;		// xor bits
74	}
75
76	// Now load the AND & XOR masks for the cursor image into the cursor
77	// buffer.  Note that a particular bit in these masks will have the
78	// following effect upon the corresponding cursor pixel:
79	//	AND  XOR	Result
80	//	 0    0		 White pixel
81	//	 0    1		 Black pixel
82	//	 1    0		 Screen color (for transparency)
83	//	 1    1		 Reverse screen color to black or white
84
85	uint8* fbCursor = (uint8*)((addr_t)si.videoMemAddr + si.cursorOffset);
86
87	for (int row = 0; row < height; row++) {
88		for (int colByte = 0; colByte < width / 8; colByte++) {
89			fbCursor[row * 16 + colByte] = *andMask++;
90			fbCursor[row * 16 + colByte + 2] = *xorMask++;
91		}
92	}
93
94	// Set cursor location in video memory.
95
96	WriteCrtcReg(0x4d, (0xff & si.cursorOffset / 1024));
97	WriteCrtcReg(0x4c, (0x0f00 & si.cursorOffset / 1024) >> 8);
98
99	// Set the cursor colors which are black foreground and white background.
100
101	ReadCrtcReg(0x45);		// reset cursor color stack pointer
102	WriteCrtcReg(0x4a, 0);	// set foreground color stack low, mid, high bytes
103	WriteCrtcReg(0x4a, 0);
104	WriteCrtcReg(0x4a, 0);
105
106	ReadCrtcReg(0x45);		// reset cursor color stack pointer
107	WriteCrtcReg(0x4b, ~0);	// set background color stack low, mid, high bytes
108	WriteCrtcReg(0x4b, ~0);
109	WriteCrtcReg(0x4b, ~0);
110
111	return true;
112}
113