Category : Files from Magazines
Archive : DDJ9407C.ZIP
Filename : RAYSVGA.CPP
Output of file : RAYSVGA.CPP contained in archive : DDJ9407C.ZIP
/*** (C) Copyright A.MANGEN 1994 ***/
/***********************************************************************/
/*** PROJECT : RAY TRACING PROGRAM ***/
/*** PROGRAM NAME: RAYSVGA.CPP ***/
/*** VERSION : 1.1 ***/
/***-----------------------------------------------------------------***/
/*** DESCRIPTION : VESA SVGA Interface Routines ***/
/***********************************************************************/
#include
#include
#include
#include "raysvga.h"
int VESA_CurrentBank=0;
int VESA_GetMaxX=0;
int VESA_GetMaxY=0;
unsigned char far *VESA_Screen = (unsigned char *) MK_FP(0xA000,0);
struct { char R,G,B; } VESA_Palette[256];
int VESA_SetMode(int Mode,int GetMaxX,int GetMaxY)
{ union REGS inregs,outregs;
inregs.x.ax=0x4F02; // Set SVGA Mode
inregs.x.bx=Mode; // Mode
int86(0x10,&inregs,&outregs);
VESA_CurrentBank=0; // Initialize variables
VESA_GetMaxX=GetMaxX;
VESA_GetMaxY=GetMaxY;
memset(&VESA_Palette,0,sizeof(VESA_Palette));
return(outregs.x.ax==VESA_OK);
}
int VESA_Close()
{ union REGS inregs,outregs;
inregs.x.ax=0x4F02; // Set SVGA Mode
inregs.x.bx=3; // Mode
int86(0x10,&inregs,&outregs);
VESA_CurrentBank=VESA_GetMaxX=VESA_GetMaxY=0;
return(outregs.x.ax==VESA_OK);
}
int VESA_GetMode()
{ union REGS inregs,outregs;
inregs.x.ax=0x4F03; // Get SVGA Mode
int86(0x10,&inregs,&outregs);
return(outregs.x.ax==VESA_OK?outregs.x.bx:FALSE);
}
int VESA_SetBank(int N)
{ union REGS inregs,outregs;
inregs.x.ax=0x4F05; // Video Memory Window Control
inregs.x.bx=0x0; // Select window / Window 0
inregs.x.dx=VESA_CurrentBank=N;
int86(0x10,&inregs,&outregs);
return(outregs.x.ax==VESA_OK);
}
void VESA_PutPixel(int x,int y,int color)
{ long ofs,B;
ofs=(long) VESA_GetMaxX * (long) y + (long) x;
if((B=ofs>>16)!=VESA_CurrentBank)
VESA_SetBank((int) B); // Set SVGA Memory Bank
VESA_Screen[(int) (ofs & 0xFFFFL)]=color; // Direct Memory Addressing
}
void VESA_WritePixel(int x,int y,int n,char *color)
{ long ofs,B;
ofs=(long) VESA_GetMaxX * (long) y + (long) x;
if((B=ofs>>16)!=VESA_CurrentBank)
VESA_SetBank((int) B); // Set SVGA Memory Bank
ofs&=0xFFFFL;
if(ofs+n<=0x10000L)
_fmemcpy(VESA_Screen+ofs,color,n); // Direct Memory Addressing
else
{ _fmemcpy(VESA_Screen+ofs,color,0x10000L-ofs);
VESA_SetBank((int) B+1);
_fmemcpy(VESA_Screen,color+0x10000L-ofs,ofs+n-0x10000L);
}
}
void VESA_ShowPalette() // Display active palette
{ for(int y=0;y<256;y++)
for(int x=0;x
(void) getchar();
}
void VESA_LoadBlackPalette() // Black palette
{ memset(&VESA_Palette,0,sizeof(VESA_Palette));
}
void VESA_LoadBWPalette() // Grey scale palette
{ memset(&VESA_Palette,0,sizeof(VESA_Palette));
for(int i=0;i<256;i++)
VESA_Palette[i].R=VESA_Palette[i].G=VESA_Palette[i].B=i/4;
}
void VESA_LoadColor(int i,int R,int G,int B) // Load a color in palette
{ VESA_Palette[i].R=R;
VESA_Palette[i].G=G;
VESA_Palette[i].B=B;
}
void VESA_ActivatePalette() // Transfer in-memory palette
{ union REGS inregs,outregs; // to VGA video palette
struct SREGS segregs;
inregs.x.ax=0x1012; // Set Palette
inregs.x.bx=0; // Start of colormap
inregs.x.cx=256; // Number of colors
inregs.x.dx=FP_OFF(VESA_Palette);
segregs.es=FP_SEG(VESA_Palette);
int86x(0x10,&inregs,&outregs,&segregs);
}
void Beep() // Sound speaker
{ sound(440); delay(50); nosound();
}
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