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The C Users' Group Library 1994 August
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wc-cdrom-cusersgrouplibrary-1994-08.iso
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v_01_07
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1n07024a
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1990-11-05
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/*
* To link the VESAINFO program, issue the following command:
* LINK VESADEMO VESA;
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "vesa.h"
#include "vesa.fd"
extern int main(int argc,char * *argv);
extern void DisplaySVGAInfo(struct vga_info_block *vesa_info);
extern void DisplaySVGAModeInfo(short svga_mode,
struct mode_info_block *mode_info,short vesa_ver);
extern void DisplayAttributes(struct attr_list *attr_ptr,
short attr_count,short source_info);
extern void strcpy_from_far_away(char *here_str,char far *far_str);
struct attr_list {
short attr_val; /* Bitmask value for "AND" comparison */
char *attr_true; /* Display this string if masked true */
char *attr_false; /* Display this string if masked false */
} AttrList;
struct attr_list mode_attrs[] = {
{ SVGA_MODE_HARDWARE,
"Mode is supported in hardware",
"Mode is not supported in hardware" },
{ SVGA_MODE_EXTENDED,
"Extended mode information is available",
"Extended mode information is not available" },
{ SVGA_MODE_BIOS,
"Output functions are supported by BIOS",
"Output functions are not supported by BIOS" },
{ SVGA_MODE_COLOR,
"This is a color mode",
"This is a monochrome mode" },
{ SVGA_MODE_GRAPHICS,
"This is a graphics mode",
"This is a text mode" }
};
struct attr_list win_attrs[] = {
{ SVGA_WIN_SUPPORTED,
"Window is supported",
"Window is not supported" },
{ SVGA_WIN_READABLE,
"Window is readable",
"Window is not readable" },
{ SVGA_WIN_WRITEABLE,
"Window is writeable",
"Window is not writeable" },
};
#define NUM_MODE_ATTRS (sizeof(mode_attrs) / sizeof(AttrList))
#define NUM_WIN_ATTRS (sizeof(win_attrs) / sizeof(AttrList))
char *model_names[] = {
"Text mode", "CGA graphics", "Hercules graphics",
"4-plane planar", "Packed pixel", "non-chain 4, 256 color"
};
#define NOT_AVAILABLE "Not available (needs VESA v1.1)"
int main(argc, argv)
int argc;
char **argv;
{
VgaInfoBlock *vesa_info;
ModeInfoBlock *mode_info;
short far *temp_mode_ptr;
short VgaStat;
short num_blocks;
printf("VESA Information Reporter v1.30, by Victor R. Volkman\n");
/* If either of the first two "sizeof" tests fail, then your compiler
has added filler bytes between the struct fields. Recompile with
appropriate structure packing option */
if (sizeof(VgaInfoBlock) != SVGA_INFO_BLOCK)
{
printf("error: VgaInfoBlock must be %d bytes!\n",SVGA_INFO_BLOCK);
exit(-1);
}
if (sizeof(ModeInfoBlock) != SVGA_INFO_BLOCK)
{
printf("error: ModeInfoBlock must be %d bytes!\n",SVGA_INFO_BLOCK);
exit(-1);
}
if ((vesa_info=(VgaInfoBlock *) calloc(1,sizeof(VgaInfoBlock))) == NULL)
{
printf("error: unable to allocate SVGA Info Block\n");
exit(-1);
}
if ((mode_info=(ModeInfoBlock *) calloc(1,SVGA_INFO_BLOCK)) == NULL)
{
printf("error: unable to allocate Mode Info Block\n");
exit(-1);
}
printf("Testing for presence of VESA support...\n");
VgaStat = GetSVGAInfo(vesa_info);
if (VgaStat == ERROR_VESA_NOT_SUPPORTED)
{
printf("error: VESA support has not been installed!\n");
return VgaStat;
}
else if (VgaStat == ERROR_VESA_NO_SIGNATURE)
{
printf("error: bad VESA signature, VESA Support disabled\n");
return VgaStat;
}
DisplaySVGAInfo(vesa_info);
GetSVGAStateBufferSize(0x0F, &num_blocks);
printf("Bytes required to save/restore total video state: %d\n",num_blocks*64);
temp_mode_ptr = vesa_info->VideoModePtr;
while (*temp_mode_ptr != -1)
{
GetSVGAModeInfo(*temp_mode_ptr, mode_info);
DisplaySVGAModeInfo(*temp_mode_ptr, mode_info, vesa_info->VESAVersion);
temp_mode_ptr++;
}
free((char *) vesa_info);
free((char *) mode_info);
return 0;
}
void DisplaySVGAInfo(vesa_info)
VgaInfoBlock *vesa_info;
{
char oem_str[80];
char total_mem_str[80];
short far *temp_mode_ptr;
printf("VESA Version Number %d.%02d\n", vesa_info->VESAVersion / 256,
vesa_info->VESAVersion % 256);
/* Fetch string regardless of near/far memory model */
strcpy_from_far_away(oem_str, vesa_info->OEMStringPtr);
printf("SuperVGA OEM manufacturing code: \"%s\".\n", oem_str);
printf("SuperVGA Capabilities: %08lXh (normally 00000000h)\n", vesa_info->capabilities);
if (vesa_info->VESAVersion >= VESA_VER_110)
sprintf(total_mem_str, "%dK bytes\n", vesa_info->TotalMemory * 64);
else
strcpy(total_mem_str, NOT_AVAILABLE);
printf("Total Memory on VGA card: %s\n", total_mem_str);
printf("Video Mode List: ");
temp_mode_ptr = vesa_info->VideoModePtr;
while (*temp_mode_ptr != -1)
printf("%03Xh ",*temp_mode_ptr++);
printf("\n");
}
void DisplaySVGAModeInfo(svga_mode,mode_info,vesa_ver)
short svga_mode;
ModeInfoBlock *mode_info;
short vesa_ver;
{
char model_str[40];
char image_page_str[80];
short mode_no;
printf("\nReport for mode %03Xh:\n", svga_mode);
printf("\tMode Attributes: %04Xh\n",mode_info->ModeAttributes);
DisplayAttributes(mode_attrs,NUM_MODE_ATTRS,mode_info->ModeAttributes);
printf("\tWindow A Attributes:\n");
DisplayAttributes(win_attrs,NUM_WIN_ATTRS,mode_info->WinAAttributes);
printf("\tWindow B Attributes:\n");
DisplayAttributes(win_attrs,NUM_WIN_ATTRS,mode_info->WinBAttributes);
printf("\tWindow Granularity: %dK\n",mode_info->WinGranularity);
printf("\tWindow Size: %dK\n",mode_info->WinSize);
printf("\tWindow A Segment: %04Xh\n", mode_info->WinASegment);
printf("\tWindow B Segment: %04Xh\n", mode_info->WinBSegment);
printf("\tWindow Function Pointer: %p\n", mode_info->WinFuncPtr);
printf("\tBytes Per Scan Line: %d\n", mode_info->BytesPerScanLine);
if (mode_info->ModeAttributes & SVGA_MODE_EXTENDED)
{
printf("\tExtended mode information:\n");
printf("\t\tX Resolution: %d\n",mode_info->XResolution);
printf("\t\tY Resolution: %d\n",mode_info->YResolution);
printf("\t\tX Char Size: %d pixels\n",mode_info->XCharSize);
printf("\t\tY Char Size: %d pixels\n",mode_info->YCharSize);
printf("\t\tNumber of Planes: %d\n",mode_info->NumberOfPlanes);
printf("\t\tBits per Pixel: %d\n",mode_info->BitsPerPixel);
printf("\t\tNumber of Banks: %d\n",mode_info->NumberOfBanks);
mode_no = mode_info->MemoryModel;
if (mode_no > 0 && mode_no < 6)
strcpy(model_str,model_names[mode_no]);
else if (mode_no >= 0x06 && mode_no <= 0x0F)
strcpy(model_str,"Reserved, to be defined by VESA");
else
strcpy(model_str,"To be defined by OEM");
printf("\t\tMemory Model: %s\n",model_str);
printf("\t\tBank Size: %dK\n",mode_info->BankSize);
if (vesa_ver >= VESA_VER_110)
itoa(mode_info->NumberOfImagePages, image_page_str, 10);
else
strcpy(image_page_str, NOT_AVAILABLE);
printf("\t\tNumber of Image Pages: %s\n",image_page_str);
}
printf("\n");
}
void DisplayAttributes(attr_ptr, attr_count, source_info)
struct attr_list *attr_ptr;
short attr_count;
short source_info;
{
int i;
char *use_str;
for (i=0; i<attr_count; i++)
{
if (attr_ptr[i].attr_val & source_info)
use_str = attr_ptr[i].attr_true;
else
use_str = attr_ptr[i].attr_false;
printf("\t\t%s.\n",use_str);
}
}
/* copy string from far (32-bit) source, regardless of memory model */
void strcpy_from_far_away(here_str,far_str)
char *here_str;
char far *far_str;
{
while (*far_str)
*here_str++ = *far_str++;
*here_str = '\0';
}