Mail Archives: djgpp/1998/03/28/21:02:13
| From: | Nicolas Blais <eletech AT netrover DOT com>
|
| Newsgroups: | comp.os.msdos.djgpp
|
| Subject: | HELP!!: Can anyone optimize my code here? (vesa.cpp)
|
| Date: | Sat, 28 Mar 1998 20:51:31 -0500
|
| Organization: | Elemental Technologies
|
| Lines: | 225
|
| Message-ID: | <351DA923.7E2A8732@netrover.com>
|
| NNTP-Posting-Host: | 198.168.87.18
|
| Mime-Version: | 1.0
|
| To: | djgpp AT delorie DOT com
|
| DJ-Gateway: | from newsgroup comp.os.msdos.djgpp
|
This is a multi-part message in MIME format.
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I need a pro who can optimize my code and send it back to me. This is a
kind of a VESA sub-routine. My main problem with it is that to show
text on the screen, I have to use 2 lines of codes for just one line of
text. (Put_char)
Also, how do I set the VESA mode to 640x480x16k?
Thanks, Nicolas Blais
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<HTML>
<B>I need a pro who can optimize my code</B> and <B>send it back to me</B>.
This is a kind of a VESA sub-routine. My main problem with it is
that to show text on the screen, I have to use 2 lines of codes for just
one line of text. (Put_char)
<BR>Also, how do I set the VESA mode to 640x480x16k?
<P>Thanks, Nicolas Blais
<BR>
<BR> </HTML>
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#include <dpmi.h>
#include <go32.h>
#include <sys/farptr.h>
#include <iostream.h>
typedef struct VESA_INFO
{
unsigned char VESASignature[4] __attribute__ ((packed));
unsigned short VESAVersion __attribute__ ((packed));
unsigned long OEMStringPtr __attribute__ ((packed));
unsigned char Capabilities[4] __attribute__ ((packed));
unsigned long VideoModePtr __attribute__ ((packed));
unsigned short TotalMemory __attribute__ ((packed));
unsigned short OemSoftwareRev __attribute__ ((packed));
unsigned long OemVendorNamePtr __attribute__ ((packed));
unsigned long OemProductNamePtr __attribute__ ((packed));
unsigned long OemProductRevPtr __attribute__ ((packed));
unsigned char Reserved[222] __attribute__ ((packed));
unsigned char OemData[256] __attribute__ ((packed));
} VESA_INFO;
VESA_INFO vesa_info;
int get_vesa_info()
{
__dpmi_regs r;
long dosbuf;
int c;
dosbuf = __tb & 0xFFFFF;
for (c=0; c<sizeof(VESA_INFO); c++)
_farpokeb(_dos_ds, dosbuf+c, 0);
dosmemput("VBE2", 4, dosbuf);
r.x.ax = 0x4F00;
r.x.di = dosbuf & 0xF;
r.x.es = (dosbuf>>4) & 0xFFFF;
__dpmi_int(0x10, &r);
if (r.h.ah)
return -1;
dosmemget(dosbuf, sizeof(VESA_INFO), &vesa_info);
if (strncmp(vesa_info.VESASignature, "VESA", 4) != 0)
return -1;
return 0;
}
typedef struct MODE_INFO
{
unsigned short ModeAttributes __attribute__ ((packed));
unsigned char WinAAttributes __attribute__ ((packed));
unsigned char WinBAttributes __attribute__ ((packed));
unsigned short WinGranularity __attribute__ ((packed));
unsigned short WinSize __attribute__ ((packed));
unsigned short WinASegment __attribute__ ((packed));
unsigned short WinBSegment __attribute__ ((packed));
unsigned long WinFuncPtr __attribute__ ((packed));
unsigned short BytesPerScanLine __attribute__ ((packed));
unsigned short XResolution __attribute__ ((packed));
unsigned short YResolution __attribute__ ((packed));
unsigned char XCharSize __attribute__ ((packed));
unsigned char YCharSize __attribute__ ((packed));
unsigned char NumberOfPlanes __attribute__ ((packed));
unsigned char BitsPerPixel __attribute__ ((packed));
unsigned char NumberOfBanks __attribute__ ((packed));
unsigned char MemoryModel __attribute__ ((packed));
unsigned char BankSize __attribute__ ((packed));
unsigned char NumberOfImagePages __attribute__ ((packed));
unsigned char Reserved_page __attribute__ ((packed));
unsigned char RedMaskSize __attribute__ ((packed));
unsigned char RedMaskPos __attribute__ ((packed));
unsigned char GreenMaskSize __attribute__ ((packed));
unsigned char GreenMaskPos __attribute__ ((packed));
unsigned char BlueMaskSize __attribute__ ((packed));
unsigned char BlueMaskPos __attribute__ ((packed));
unsigned char ReservedMaskSize __attribute__ ((packed));
unsigned char ReservedMaskPos __attribute__ ((packed));
unsigned char DirectColorModeInfo __attribute__ ((packed));
unsigned long PhysBasePtr __attribute__ ((packed));
unsigned long OffScreenMemOffset __attribute__ ((packed));
unsigned short OffScreenMemSize __attribute__ ((packed));
unsigned char Reserved[206] __attribute__ ((packed));
} MODE_INFO;
MODE_INFO mode_info;
int get_mode_info(int mode)
{
__dpmi_regs r;
long dosbuf;
int c;
dosbuf = __tb & 0xFFFFF;
for (c=0; c<sizeof(MODE_INFO); c++)
_farpokeb(_dos_ds, dosbuf+c, 0);
r.x.ax = 0x4F01;
r.x.di = dosbuf & 0xF;
r.x.es = (dosbuf>>4) & 0xFFFF;
r.x.cx = mode;
__dpmi_int(0x10, &r);
if (r.h.ah)
return -1;
dosmemget(dosbuf, sizeof(MODE_INFO), &mode_info);
return 0;
}
int find_vesa_mode(int w, int h)
{
int mode_list[256];
int number_of_modes;
long mode_ptr;
int c;
if (get_vesa_info() != 0)
return 0;
mode_ptr = ((vesa_info.VideoModePtr & 0xFFFF0000) >> 12) + (vesa_info.VideoModePtr & 0xFFFF);
number_of_modes = 0;
while (_farpeekw(_dos_ds, mode_ptr) != 0xFFFF)
{
mode_list[number_of_modes] = _farpeekw(_dos_ds, mode_ptr);
number_of_modes++;
mode_ptr += 2;
}
for (c=0; c<number_of_modes; c++) {
if (get_mode_info(mode_list[c]) != 0) continue;
if ((mode_info.ModeAttributes & 0x19) != 0x19) continue;
if ((mode_info.XResolution != w) || (mode_info.YResolution != h)) continue;
if (mode_info.NumberOfPlanes != 1) continue;
if (mode_info.MemoryModel != 4) continue;
if (mode_info.BitsPerPixel != 8) continue;
return mode_list[c];
}
return 0;
}
int set_vesa_mode(int w, int h)
{
__dpmi_regs r;
int mode_number;
mode_number = find_vesa_mode(w, h);
if (!mode_number)
return -1;
r.x.ax = 0x4F02;
r.x.bx = mode_number;
__dpmi_int(0x10, &r);
if (r.h.ah) return -1;
return 0;
}
void set_vesa_bank(int bank_number)
{
__dpmi_regs r;
r.x.ax = 0x4F05;
r.x.bx = 0;
r.x.dx = bank_number;
__dpmi_int(0x10, &r);
}
void putpixel_vesa_640x480(int x, int y, int color)
{
int address = y*640+x;
int bank_size = mode_info.WinGranularity*1024;
int bank_number = address/bank_size;
int bank_offset = address%bank_size;
set_vesa_bank(bank_number);
_farpokeb(_dos_ds, 0xA0000+bank_offset, color);
}
void set_mode(int m)
{
__dpmi_regs r;
r.h.ah = 0;
r.h.al = m;
__dpmi_int(0x10, &r);
}
void put_char(int ch, int color)
{
__dpmi_regs r;
r.h.ah = 0x0e;
r.h.al = ch;
r.h.bh = 0;
r.h.bl = color;
__dpmi_int(0x10, &r);
}
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