diff options
Diffstat (limited to 'src/mesa/drivers/dos/mga/mga_mode.c')
| -rw-r--r-- | src/mesa/drivers/dos/mga/mga_mode.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/src/mesa/drivers/dos/mga/mga_mode.c b/src/mesa/drivers/dos/mga/mga_mode.c new file mode 100644 index 0000000000..33f47a6486 --- /dev/null +++ b/src/mesa/drivers/dos/mga/mga_mode.c @@ -0,0 +1,231 @@ +/*
+ * 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 5.0 -- 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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