quakeforge/libs/video/targets/vid_svgalib.c

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/*
vid_svgalib.c
Linux SVGALib video routines
Copyright (C) 1996-1997 Id Software, Inc.
Copyright (C) 1999-2000 Marcus Sundberg [mackan@stacken.kth.se]
Copyright (C) 1999-2000 David Symonds [xoxus@usa.net]
Copyright (C) 1999,2000 contributors of the QuakeForge project
Please see the file "AUTHORS" for a list of contributors
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
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#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_SYS_IO_H
# include <sys/io.h>
#elif defined(HAVE_ASM_IO_H)
# include <asm/io.h>
#endif
#include <stdio.h>
#include <vga.h>
#include "QF/cmd.h"
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#include "QF/console.h"
#include "QF/cvar.h"
#include "QF/input.h"
#include "QF/qargs.h"
#include "QF/qendian.h"
#include "QF/sys.h"
#include "QF/vid.h"
#include "compat.h"
#include "d_iface.h"
static int num_modes, current_mode;
static vga_modeinfo *modes;
static byte vid_current_palette[768];
static byte backingbuf[48 * 24];
static byte *framebuffer_ptr;
static int svgalib_inited = 0;
static int svgalib_backgrounded = 0;
static cvar_t *vid_redrawfull;
static cvar_t *vid_waitforrefresh;
int VGA_width, VGA_height, VGA_rowbytes, VGA_bufferrowbytes, VGA_planar;
byte *VGA_pagebase;
int VID_options_items = 0;
void
D_BeginDirectRect (int x, int y, byte * pbitmap, int width, int height)
{
int plane, reps, repshift, offset, vidpage, off, i, j, k;
if (!svgalib_inited || !vid.direct || svgalib_backgrounded
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|| !vga_oktowrite ())
return;
if (vid.aspect > 1.5) {
reps = 2;
repshift = 1;
} else {
reps = 1;
repshift = 0;
}
vidpage = 0;
vga_setpage (0);
if (VGA_planar) {
for (plane = 0; plane < 4; plane++) {
/* Select the correct plane for reading and writing */
outb (0x02, 0x3C4);
outb (1 << plane, 0x3C5);
outb (4, 0x3CE);
outb (plane, 0x3CF);
for (i = 0; i < (height << repshift); i += reps) {
for (k = 0; k < reps; k++) {
for (j = 0; j < (width >> 2); j++) {
backingbuf[(i + k) * 24 + (j << 2) + plane] =
vid.direct[(y + i + k) * VGA_rowbytes +
(x >> 2) + j];
vid.direct[(y + i + k) * VGA_rowbytes + (x >> 2) + j] =
pbitmap[(i >> repshift) * 24 + (j << 2) + plane];
}
}
}
}
} else {
for (i = 0; i < (height << repshift); i += reps) {
for (j = 0; j < reps; j++) {
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offset = x + ((y << repshift) + i + j) * vid.rowbytes;
off = offset % 0x10000;
if ((offset / 0x10000) != vidpage) {
vidpage = offset / 0x10000;
vga_setpage (vidpage);
}
memcpy (&backingbuf[(i + j) * 24], vid.direct + off, width);
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memcpy (vid.direct + off, &pbitmap[(i >> repshift) * width],
width);
}
}
}
}
void
D_EndDirectRect (int x, int y, int width, int height)
{
int plane, reps, repshift, offset, vidpage, off, i, j, k;
if (!svgalib_inited || !vid.direct || svgalib_backgrounded
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|| !vga_oktowrite ())
return;
if (vid.aspect > 1.5) {
reps = 2;
repshift = 1;
} else {
reps = 1;
repshift = 0;
}
vidpage = 0;
vga_setpage (0);
if (VGA_planar) {
for (plane = 0; plane < 4; plane++) {
/* Select the correct plane for writing */
outb (2, 0x3C4);
outb (1 << plane, 0x3C5);
outb (4, 0x3CE);
outb (plane, 0x3CF);
for (i = 0; i < (height << repshift); i += reps) {
for (k = 0; k < reps; k++) {
for (j = 0; j < (width >> 2); j++) {
vid.direct[(y + i + k) * VGA_rowbytes + (x >> 2) + j] =
backingbuf[(i + k) * 24 + (j << 2) + plane];
}
}
}
}
} else {
for (i = 0; i < (height << repshift); i += reps) {
for (j = 0; j < reps; j++) {
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offset = x + ((y << repshift) + i + j) * vid.rowbytes;
off = offset % 0x10000;
if ((offset / 0x10000) != vidpage) {
vidpage = offset / 0x10000;
vga_setpage (vidpage);
}
memcpy (vid.direct + off, &backingbuf[(i + j) * 24], width);
}
}
}
}
static void
VID_InitModes (void)
{
int i;
/* Get complete information on all modes */
num_modes = vga_lastmodenumber () + 1;
modes = malloc (num_modes * sizeof (vga_modeinfo));
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SYS_CHECKMEM (modes);
for (i = 0; i < num_modes; i++) {
if (vga_hasmode (i)) {
memcpy (&modes[i], vga_getmodeinfo (i), sizeof (vga_modeinfo));
} else {
modes[i].width = 0; // means not available
}
}
/* Filter for modes we don't support */
for (i = 0; i < num_modes; i++) {
if (modes[i].bytesperpixel != 1 && modes[i].colors != 256) {
modes[i].width = 0;
}
}
}
static int
get_mode (int width, int height, int depth)
{
int i, ok, match;
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match = ((!!depth) << 2) + ((!!height) << 1) + (!!width);
for (i = 0; i < num_modes; i++) {
if (modes[i].width) {
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ok = ((modes[i].bytesperpixel == (depth / 8)) << 2)
+ ((modes[i].height == height) << 1)
+ (modes[i].width == width);
if ((ok & match) == match)
break;
}
}
if (i == num_modes) {
Sys_Printf ("Mode %dx%d (%d bits) not supported\n",
width, height, depth);
i = G320x200x256;
}
return i;
}
static void
VID_shutdown (void)
{
Sys_MaskPrintf (SYS_vid, "VID_Shutdown\n");
if (!svgalib_inited)
return;
vga_setmode (TEXT);
svgalib_inited = 0;
}
void
VID_SetPalette (byte * palette)
{
static int tmppal[256 * 3];
int *tp;
int i;
if (!svgalib_inited || svgalib_backgrounded)
return;
memcpy (vid_current_palette, palette, sizeof (vid_current_palette));
if (vga_getcolors () == 256) {
tp = tmppal;
for (i = 256 * 3; i; i--) {
*(tp++) = *(palette++) >> 2;
}
if (vga_oktowrite ()) {
vga_setpalvec (0, 256, tmppal);
}
}
}
static int
VID_SetMode (int modenum, unsigned char *palette)
{
int err;
if ((modenum >= num_modes) || (modenum < 0) || !modes[modenum].width) {
Sys_Printf ("No such video mode: %d\n", modenum);
return 0;
}
current_mode = modenum;
vid.width = modes[current_mode].width;
vid.height = modes[current_mode].height;
VGA_width = modes[current_mode].width;
VGA_height = modes[current_mode].height;
VGA_planar = modes[current_mode].bytesperpixel == 0;
VGA_rowbytes = modes[current_mode].linewidth;
vid.rowbytes = modes[current_mode].linewidth;
if (VGA_planar) {
VGA_bufferrowbytes = modes[current_mode].linewidth * 4;
vid.rowbytes = modes[current_mode].linewidth * 4;
}
vid.colormap8 = (byte *) vid_colormap;
vid.fullbright = 256 - vid.colormap8[256 * VID_GRADES];
vid.conrowbytes = vid.rowbytes;
vid.numpages = 1;
// alloc screen buffer, z-buffer, and surface cache
VID_InitBuffers ();
/* get goin' */
err = vga_setmode (current_mode);
if (err) {
Sys_Error ("Video mode failed: %d", modenum);
}
VID_SetPalette (palette);
VGA_pagebase = vid.direct = framebuffer_ptr = vga_getgraphmem ();
#if 0
if (vga_setlinearaddressing () > 0) {
framebuffer_ptr = (char *) vga_getgraphmem ();
}
#endif
if (!framebuffer_ptr) {
Sys_Error ("This mode isn't hapnin'");
}
vga_setpage (0);
svgalib_inited = 1;
/* Force a surface cache flush */
vid.recalc_refdef = 1;
return 1;
}
static void
goto_background (void)
{
svgalib_backgrounded = 1;
}
static void
comefrom_background (void)
{
svgalib_backgrounded = 0;
}
void
VID_Init (byte *palette, byte *colormap)
{
int err;
// plugin_load("in_svgalib.so");
if (svgalib_inited)
return;
Sys_RegisterShutdown (VID_shutdown);
err = vga_init ();
if (err)
Sys_Error ("SVGALib failed to allocate a new VC");
if (vga_runinbackground_version () == 1) {
Sys_Printf ("SVGALIB background support detected\n");
vga_runinbackground (VGA_GOTOBACK, goto_background);
vga_runinbackground (VGA_COMEFROMBACK, comefrom_background);
vga_runinbackground (1);
} else {
vga_runinbackground (0);
}
VID_InitModes ();
/* Interpret command-line params */
VID_GetWindowSize (640, 480);
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current_mode = get_mode (vid.width, vid.height, 8);
/* Set vid parameters */
vid_colormap = colormap;
VID_SetMode (current_mode, palette);
VID_InitGamma (palette);
VID_SetPalette (vid.palette);
vid.initialized = true;
}
void
VID_Init_Cvars ()
{
vid_redrawfull = Cvar_Get ("vid_redrawfull", "0", CVAR_NONE, NULL,
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"Redraw entire screen each frame instead of "
"just dirty areas");
vid_waitforrefresh = Cvar_Get ("vid_waitforrefresh", "0", CVAR_ARCHIVE,
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NULL, "Wait for vertical retrace before "
"drawing next frame");
vid_system_gamma = Cvar_Get ("vid_system_gamma", "1", CVAR_ARCHIVE, NULL,
"Use system gamma control if available");
}
void
VID_Update (vrect_t *rects)
{
if (!svgalib_inited || svgalib_backgrounded)
return;
if (!vga_oktowrite ()) {
/* Can't update screen if it's not active */
return;
}
if (vid_waitforrefresh->int_val) {
vga_waitretrace ();
}
if (VGA_planar) {
VGA_UpdatePlanarScreen (vid.buffer);
} else if (vid_redrawfull->int_val) {
int total = vid.rowbytes * vid.height;
int offset;
for (offset = 0; offset < total; offset += 0x10000) {
vga_setpage (offset / 0x10000);
memcpy (framebuffer_ptr, vid.buffer + offset,
((total - offset > 0x10000) ? 0x10000 : (total - offset)));
}
} else {
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int offset, ycount;
int vidpage = 0;
vga_setpage (0);
while (rects) {
ycount = rects->height;
offset = rects->y * vid.rowbytes + rects->x;
while (ycount--) {
register int i = offset % 0x10000;
if ((offset / 0x10000) != vidpage) {
vidpage = offset / 0x10000;
vga_setpage (vidpage);
}
if (rects->width + i > 0x10000) {
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memcpy (framebuffer_ptr + i, vid.buffer + offset,
0x10000 - i);
vga_setpage (++vidpage);
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memcpy (framebuffer_ptr, vid.buffer + offset + 0x10000 - i,
rects->width - 0x10000 + i);
} else {
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memcpy (framebuffer_ptr + i, vid.buffer + offset,
rects->width);
}
offset += vid.rowbytes;
}
rects = rects->next;
}
}
}
void
VID_LockBuffer (void)
{
}
void
VID_UnlockBuffer (void)
{
}
void
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VID_SetCaption (const char *text)
{
}
qboolean
VID_SetGamma (double gamma)
{
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return false;
}
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#if defined(i386) && defined(__GLIBC__) && (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 2))
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void
outb (unsigned char val, unsigned short port)
{
asm ("outb %b0, %w1" : :"a"(val), "d"(port));
}
#elif defined(__FreeBSD__)
static inline void
outb (unsigned char value, unsigned short port)
{
__asm__ __volatile__ ("outb %b0,%w1"::"a" (value), "d" (port));
}
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#endif