home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
OpenStep 4.2J (Developer)
/
os42jdev.iso
/
NextDeveloper
/
Examples
/
DriverKit
/
QVision
/
QVision_reloc.tproj
/
QVisionDAC.m
< prev
next >
Wrap
Text File
|
1996-03-26
|
5KB
|
192 lines
/* Copyright (c) 1993-1996 by NeXT Software, Inc. as an unpublished work.
* All rights reserved.
*
* QVisionDAC.m -- DAC support for the QVision.
*
* History
* Thu Sep 15 16:13:45 PDT 1994, James C. Lee
* Added AT&T 20C505 DAC support
* Author: Derek B Clegg 30 June 1993
* Based on work by Joe Pasqua.
*/
#import <driverkit/generalFuncs.h>
#import <driverkit/i386/ioPorts.h>
#import <bsd/dev/ev_types.h>
#import "QVision.h"
/* The `ProgramDAC' category of `QVision'. */
@implementation QVision (ProgramDAC)
// also check for AT&T 20C505 DAC; it's BT485 compatible
static DACtype checkForBrooktreeDAC(void)
{
DACtype dac;
/* Unlock the extended graphics registers. */
outw(VGA_GRFX_INDEX, 0x050f);
/* Unlock some more extended registers. */
outb(VGA_GRFX_INDEX, 0x10);
outb(VGA_GRFX_DATA, 0x08);
/* Read the status register. */
switch (inb(DAC_EXT_REG) & 0xF0) {
case 0x40:
dac = Bt484;
break;
case 0x80:
dac = Bt485;
break;
case 0x20:
dac = Bt485A;
break;
case 0xd0:
dac = ATT20C505;
break;
default:
dac = UnknownDAC;
break;
}
return dac;
}
- determineDACType
{
dac = checkForBrooktreeDAC();
return self;
}
/* Default gamma precompensation table for color displays.
* Gamma 2.2 LUT for P22 phosphor displays (Hitachi, NEC, generic VGA) */
static const unsigned char gamma16[] = {
0, 74, 102, 123, 140, 155, 168, 180,
192, 202, 212, 221, 230, 239, 247, 255
};
static const unsigned char gamma8[] = {
0, 15, 22, 27, 31, 35, 39, 42, 45, 47, 50, 52,
55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 74, 76,
78, 79, 81, 82, 84, 85, 87, 88, 90, 91, 93, 94,
95, 97, 98, 99, 100, 102, 103, 104, 105, 107, 108, 109,
110, 111, 112, 114, 115, 116, 117, 118, 119, 120, 121, 122,
123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134,
135, 136, 137, 138, 139, 140, 141, 141, 142, 143, 144, 145,
146, 147, 148, 148, 149, 150, 151, 152, 153, 153, 154, 155,
156, 157, 158, 158, 159, 160, 161, 162, 162, 163, 164, 165,
165, 166, 167, 168, 168, 169, 170, 171, 171, 172, 173, 174,
174, 175, 176, 177, 177, 178, 179, 179, 180, 181, 182, 182,
183, 184, 184, 185, 186, 186, 187, 188, 188, 189, 190, 190,
191, 192, 192, 193, 194, 194, 195, 196, 196, 197, 198, 198,
199, 200, 200, 201, 201, 202, 203, 203, 204, 205, 205, 206,
206, 207, 208, 208, 209, 210, 210, 211, 211, 212, 213, 213,
214, 214, 215, 216, 216, 217, 217, 218, 218, 219, 220, 220,
221, 221, 222, 222, 223, 224, 224, 225, 225, 226, 226, 227,
228, 228, 229, 229, 230, 230, 231, 231, 232, 233, 233, 234,
234, 235, 235, 236, 236, 237, 237, 238, 238, 239, 240, 240,
241, 241, 242, 242, 243, 243, 244, 244, 245, 245, 246, 246,
247, 247, 248, 248, 249, 249, 250, 250, 251, 251, 252, 252,
253, 253, 254, 255,
};
static void
SetGammaValue(unsigned int r, unsigned int g, unsigned int b, int level)
{
outb(PALETTE_DATA, EV_SCALE_BRIGHTNESS(level, r));
outb(PALETTE_DATA, EV_SCALE_BRIGHTNESS(level, g));
outb(PALETTE_DATA, EV_SCALE_BRIGHTNESS(level, b));
}
- setGammaTable
{
unsigned int i, j, g;
const IODisplayInfo *displayInfo;
displayInfo = [self displayInfo];
outb(PALETTE_WRITE, 0x00);
if (redTransferTable != 0) {
for (i = 0; i < transferTableCount; i++) {
for (j = 0; j < 256/transferTableCount; j++) {
SetGammaValue(redTransferTable[i], greenTransferTable[i],
blueTransferTable[i], brightnessLevel);
}
}
} else {
switch (displayInfo->bitsPerPixel) {
case IO_24BitsPerPixel:
case IO_8BitsPerPixel:
for (g = 0; g < 256; g++) {
SetGammaValue(gamma8[g], gamma8[g], gamma8[g],
brightnessLevel);
}
break;
case IO_15BitsPerPixel:
for (i = 0; i < 32; i++) {
for (j = 0; j < 8; j++) {
SetGammaValue(gamma16[i/2], gamma16[i/2], gamma16[i/2],
brightnessLevel);
}
}
break;
default:
break;
}
}
return self;
}
- resetDAC
{
const QVisionMode *mode;
mode = [self displayInfo]->parameters;
if (dac == Bt485 || dac == Bt485A || dac == ATT20C505) {
/* Brooktree 485 or 485A only! */
outb(DAC_CMD_0, 0x80); /* Enable the DAC_EXT_REG. */
outb(PALETTE_WRITE, 0x01); /* Make 13C6 be the DAC_EXT_REG. */
outb(DAC_EXT_REG, 0x00); /* Turn off clock doubling. */
outb(PALETTE_WRITE, 0x00); /* Restore 13C6. */
}
/* Restore DAC command registers 0, 1, & 2 to their initial VGA values. */
outb(DAC_CMD_0, 0x40);
outb(DAC_CMD_1, 0x00);
outb(DAC_CMD_2, 0x20);
return self;
}
- programDAC
{
const QVisionMode *mode;
mode = [self displayInfo]->parameters;
/* Load DAC Command regs. */
outb(DAC_CMD_0, 0x02); /* 8-bit DAC. */
outb(DAC_CMD_1, mode->dacCmd1); /* Set the bits per pixel. */
outb(DAC_CMD_2, 0x20); /* Allow advanced modes. */
if (mode->needsPixelDoubling &&
(dac == Bt485 || dac == Bt485A || dac == ATT20C505))
{
/* Brooktree 485 or 485A, or AT&T 20C505 only! */
outb(DAC_CMD_0, 0x82); /* Enable the DAC_EXT_REG. */
outb(PALETTE_WRITE, 0x01); /* Make 13C6 be the DAC_EXT_REG. */
outb(DAC_EXT_REG, 0x08); /* Turn on clock doubling. */
}
/* Set overscan color (black) */
outb(CO_COLOR_WRITE, 0x00);
outb(CO_COLOR_DATA, 0x00); /* Red component. */
outb(CO_COLOR_DATA, 0x00); /* Green component. */
outb(CO_COLOR_DATA, 0x00); /* Blue component. */
return self;
}
@end