Mail Archives: djgpp/1998/03/30/08:00:41
From: | Nicolas Blais <eletech AT netrover DOT com>
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Newsgroups: | comp.os.msdos.djgpp
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Subject: | **HELP!** can someone modify my sub-routine to make it better? (vesa.cpp)
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Date: | Mon, 30 Mar 1998 07:48:31 -0500
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Organization: | Elemental Technologies
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Lines: | 204
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Message-ID: | <351F949E.D7B85E7F@netrover.com>
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NNTP-Posting-Host: | 198.168.87.54
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Mime-Version: | 1.0
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To: | djgpp AT delorie DOT com
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DJ-Gateway: | from newsgroup comp.os.msdos.djgpp
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This is a multi-part message in MIME format.
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Hi, I don't know how many times I asked this but, please, can you make
my code better? Especially that put_char() that I got from someone
else, it's effecient, but it's 2 lines of code that I know you can turn
into 1. Also, make my putpixel() better, I heard it was slow and
awkward.
Feel free to keep it too.
Nicolas Blais
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Content-Type: text/plain; charset=us-ascii; name="Vesa.cpp"
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Content-Disposition: inline; filename="Vesa.cpp"
#include <dpmi.h>
#include <go32.h>
#include <sys/farptr.h>
#include <iostream.h>
#include <string.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 depth, int mm)
{
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 != mm) continue;
if (mode_info.BitsPerPixel != depth) continue;
return mode_list[c];
}
return 0;
}
int set_vesa_mode(int w, int h, int depth, int mm)
{
__dpmi_regs r;
int mode_number;
mode_number = find_vesa_mode(w, h, depth, mm);
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(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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