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/*
* Mesa 3-D graphics library
* Version: 4.1
*
* Copyright (C) 1999 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 5.0
*
* Copyright (C) 2002 - Borca Daniel
* Email : dborca@yahoo.com
* Web : http://www.geocities.com/dborca
*/
#include <stdlib.h>
#include "vga.h"
static vl_mode modes[4] = {
{0x13 | 0x4000, 320, 200, 320, 8, -1, 320*200},
{0xffff, -1, -1, -1, -1, -1, -1}
};
static word16 vga_ver;
static int linear_selector;
static int oldmode = -1;
#define vga_color_precision 6
/* Desc: Attempts to detect VGA, check video modes and create selectors.
*
* In : -
* Out : mode array
*
* Note: -
*/
static vl_mode *vga_init (void)
{
int rv = 0;
if (vga_ver) {
return modes;
}
__asm("\n\
movw $0x1a00, %%ax \n\
int $0x10 \n\
cmpb $0x1a, %%al \n\
jne 0f \n\
cmpb $0x07, %%bl \n\
jb 0f \n\
andl $0xff, %%ebx \n\
movl %%ebx, %0 \n\
0:":"=g"(rv)::"%eax", "%ebx");
if (rv == 0) {
return NULL;
}
if (_create_selector(&linear_selector, 0xa0000, 0x10000)) {
return NULL;
}
modes[0].sel = linear_selector;
vga_ver = rv;
return modes;
}
/* Desc: Frees all resources allocated by VGA init code.
*
* In : -
* Out : -
*
* Note: -
*/
static void vga_finit (void)
{
if (vga_ver) {
_remove_selector(&linear_selector);
}
}
/* Desc: Attempts to enter specified video mode.
*
* In : ptr to mode structure, refresh rate
* Out : 0 if success
*
* Note: -
*/
static int vga_entermode (vl_mode *p, int refresh)
{
if (!(p->mode & 0x4000)) {
return -1;
}
VGA.blit = vl_can_mmx() ? vesa_l_dump_virtual_mmx : vesa_l_dump_virtual;
if (oldmode == -1) {
__asm("\n\
movb $0x0f, %%ah \n\
int $0x10 \n\
andl $0xff, %%eax \n\
movl %%eax, %0 \n\
":"=g"(oldmode)::"%eax", "%ebx");
}
__asm("int $0x10"::"a"(p->mode&0xff));
return 0;
}
/* Desc: Restores to the mode prior to first call to vga_entermode.
*
* In : -
* Out : -
*
* Note: -
*/
static void vga_restore (void)
{
if (oldmode != -1) {
__asm("int $0x10"::"a"(oldmode));
}
}
/* Desc: set one palette entry
*
* In : color index, R, G, B
* Out : -
*
* Note: uses normalized values
*/
static void vga_setCI_f (int index, float red, float green, float blue)
{
float max = (1 << vga_color_precision) - 1;
int _red = red * max;
int _green = green * max;
int _blue = blue * max;
__asm("\n\
movw $0x1010, %%ax \n\
movb %1, %%dh \n\
movb %2, %%ch \n\
int $0x10 \n\
"::"b"(index), "m"(_red), "m"(_green), "c"(_blue):"%eax", "%edx");
}
/* Desc: set one palette entry
*
* In : color index, R, G, B
* Out : -
*
* Note: uses integer values
*/
static void vga_setCI_i (int index, int red, int green, int blue)
{
__asm("\n\
movw $0x1010, %%ax \n\
movb %1, %%dh \n\
movb %2, %%ch \n\
int $0x10 \n\
"::"b"(index), "m"(red), "m"(green), "c"(blue):"%eax", "%edx");
}
/* Desc: retrieve CI precision
*
* In : -
* Out : precision in bits
*
* Note: -
*/
static int vga_getCIprec (void)
{
return vga_color_precision;
}
/*
* the driver
*/
vl_driver VGA = {
vga_init,
vga_entermode,
NULL,
vga_setCI_f,
vga_setCI_i,
vga_getCIprec,
vga_restore,
vga_finit
};
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