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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 for Mesa
*
* Author: Daniel Borca
* Email : dborca@users.sourceforge.net
* Web : http://www.geocities.com/dborca
*/
#include <stdlib.h>
#include <sys/segments.h>
#include "video.h"
#include "null.h"
static vl_mode *modes;
#define null_color_precision 8
static void
null_blit_nop (void)
{
}
/* Desc: Attempts to detect NUL, check video modes and create selectors.
*
* In : -
* Out : mode array
*
* Note: -
*/
static vl_mode *
null_init (void)
{
static int m[][2] = {
{ 320, 200 },
{ 320, 240 },
{ 400, 300 },
{ 512, 384 },
{ 640, 400 },
{ 640, 480 },
{ 800, 600 },
{ 1024, 768 },
{ 1280, 1024 },
{ 1600, 1200 }
};
static int b[] = {
8,
15,
16,
24,
32
};
const unsigned int m_count = sizeof(m) / sizeof(m[0]);
const unsigned int b_count = sizeof(b) / sizeof(b[0]);
unsigned int i, j, k;
if (modes == NULL) {
modes = malloc(sizeof(vl_mode) * (1 + m_count * b_count));
if (modes != NULL) {
for (k = 0, i = 0; i < m_count; i++) {
for (j = 0; j < b_count; j++, k++) {
modes[k].xres = m[i][0];
modes[k].yres = m[i][1];
modes[k].bpp = b[j];
modes[k].mode = 0x4000;
modes[k].scanlen = m[i][0] * ((b[j] + 7) / 8);
modes[k].sel = -1;
modes[k].gran = -1;
}
}
modes[k].xres = -1;
modes[k].yres = -1;
modes[k].bpp = -1;
modes[k].mode = 0xffff;
modes[k].scanlen = -1;
modes[k].sel = -1;
modes[k].gran = -1;
}
}
return modes;
}
/* Desc: Frees all resources allocated by NUL init code.
*
* In : -
* Out : -
*
* Note: -
*/
static void
null_fini (void)
{
if (modes != NULL) {
free(modes);
modes = NULL;
}
}
/* Desc: Attempts to enter specified video mode.
*
* In : ptr to mode structure, refresh rate
* Out : 0 if success
*
* Note: -
*/
static int
null_entermode (vl_mode *p, int refresh, int fbbits)
{
NUL.blit = null_blit_nop;
return 0;
(void)(p && refresh && fbbits); /* silence compiler warning */
}
/* Desc: Restores to the mode prior to first call to null_entermode.
*
* In : -
* Out : -
*
* Note: -
*/
static void
null_restore (void)
{
}
/* Desc: set one palette entry
*
* In : color index, R, G, B
* Out : -
*
* Note: uses integer values
*/
static void
null_setCI_i (int index, int red, int green, int blue)
{
(void)(index && red && green && blue); /* silence compiler warning */
}
/* Desc: set one palette entry
*
* In : color index, R, G, B
* Out : -
*
* Note: uses normalized values
*/
static void
null_setCI_f (int index, float red, float green, float blue)
{
float max = (1 << null_color_precision) - 1;
null_setCI_i(index, (int)(red * max), (int)(green * max), (int)(blue * max));
}
/* Desc: state retrieval
*
* In : parameter name, ptr to storage
* Out : 0 if request successfully processed
*
* Note: -
*/
static int
null_get (int pname, int *params)
{
switch (pname) {
default:
params[0] = params[0]; /* silence compiler warning */
return -1;
}
return 0;
}
/*
* the driver
*/
vl_driver NUL = {
null_init,
null_entermode,
NULL,
null_setCI_f,
null_setCI_i,
null_get,
null_restore,
null_fini
};
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