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/*
* Mesa 3-D graphics library
* Version: 5.0
*
* Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* DOS/DJGPP device driver v1.3 for Mesa -- MGA2064W mode switching
*
* Copyright (c) 2003 - Borca Daniel
* Email : dborca@yahoo.com
* Web : http://www.geocities.com/dborca
*/
#include <dpmi.h>
#include <string.h>
#include <stubinfo.h>
#include <sys/exceptn.h>
#include <sys/farptr.h>
#include <sys/movedata.h>
#include <sys/segments.h>
#include "../internal.h"
#include "mga_mode.h"
static MGA_MODE oldmode;
static MGA_MODE modes[64];
/*
* VESA info
*/
#define V_SIGN 0
#define V_MINOR 4
#define V_MAJOR 5
#define V_OEM_OFS 6
#define V_OEM_SEG 8
#define V_MODE_OFS 14
#define V_MODE_SEG 16
#define V_MEMORY 18
/*
* mode info
*/
#define M_ATTR 0
#define M_GRAN 4
#define M_SCANLEN 16
#define M_XRES 18
#define M_YRES 20
#define M_BPP 25
#define M_RED 31
#define M_GREEN 33
#define M_BLUE 35
#define M_PHYS_PTR 40
/* Desc: get available modes
*
* In : -
* Out : linear modes list ptr
*
* Note: shouldn't use VESA...
*/
static MGA_MODE *_mga_mode_check (void)
{
__dpmi_regs r;
word16 *p;
MGA_MODE *q;
char vesa_info[512], tmp[512];
_farpokel(_stubinfo->ds_selector, 0, 0x32454256);
r.x.ax = 0x4f00;
r.x.di = 0;
r.x.es = _stubinfo->ds_segment;
__dpmi_int(0x10, &r);
movedata(_stubinfo->ds_selector, 0, _my_ds(), (unsigned)vesa_info, 512);
if ((r.x.ax!=0x004f) || ((_32_ vesa_info[V_SIGN])!=0x41534556)) {
return NULL;
}
p = (word16 *)(((_16_ vesa_info[V_MODE_SEG])<<4) + (_16_ vesa_info[V_MODE_OFS]));
q = modes;
do {
if ((q->mode=_farpeekw(__djgpp_dos_sel, (unsigned long)(p++)))==0xffff) {
break;
}
r.x.ax = 0x4f01;
r.x.cx = q->mode;
r.x.di = 512;
r.x.es = _stubinfo->ds_segment;
__dpmi_int(0x10, &r);
movedata(_stubinfo->ds_selector, 512, _my_ds(), (unsigned)tmp, 256);
switch (tmp[M_BPP]) {
case 16:
q->bpp = tmp[M_RED] + tmp[M_GREEN] + tmp[M_BLUE];
break;
case 8:
case 15:
case 24:
case 32:
q->bpp = tmp[M_BPP];
break;
default:
q->bpp = 0;
}
if ((r.x.ax==0x004f) && ((tmp[M_ATTR]&0x11)==0x11) && q->bpp && (tmp[M_ATTR]&0x80)) {
q->xres = _16_ tmp[M_XRES];
q->yres = _16_ tmp[M_YRES];
q->mode |= 0x4000;
q++;
}
} while (TRUE);
return modes;
}
/* Desc: save current mode
*
* In : ptr to mode structure
* Out : 0 if success
*
* Note: shouldn't use VESA...
*/
static int _mga_mode_save (MGA_MODE *p)
{
__asm("\n\
movw $0x4f03, %%ax \n\
int $0x10 \n\
movl %%ebx, %0 \n\
":"=g"(p->mode)::"%eax", "%ebx");
return 0;
}
/* Desc: switch to specified mode
*
* In : ptr to mode structure, refresh rate
* Out : 0 if success
*
* Note: shouldn't use VESA...
*/
int mga_mode_switch (MGA_MODE *p, int refresh)
{
if (oldmode.mode == 0) {
_mga_mode_save(&oldmode);
}
__asm("movw $0x4f02, %%ax; int $0x10"::"b"(p->mode):"%eax");
return 0;
(void)refresh; /* silence compiler warning */
}
/* Desc: restore to the mode prior to first call to `mga_switch'
*
* In : -
* Out : 0 if success
*
* Note: shouldn't use VESA...
*/
int mga_mode_restore (void)
{
if (oldmode.mode != 0) {
__asm("movw $0x4f02, %%ax; int $0x10"::"b"(oldmode.mode):"%eax");
oldmode.mode = 0;
}
return 0;
}
/* Desc: return suitable mode
*
* In : width, height, bpp
* Out : ptr to mode structure
*
* Note: -
*/
MGA_MODE *mga_mode_find (int width, int height, int bpp)
{
static MGA_MODE *q = NULL;
MGA_MODE *p;
unsigned int min;
if (q == NULL) {
if ((q = _mga_mode_check()) == NULL) {
return NULL;
}
}
/* search for a mode that fits our request */
for (min=-1, p=NULL; q->mode!=0xffff; q++) {
if ((q->xres>=width) && (q->yres>=height) && (q->bpp==bpp)) {
if (min>=(unsigned)(q->xres*q->yres)) {
min = q->xres*q->yres;
p = q;
}
}
}
return p;
}
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