SM_GRX2 module routines

SM_GRX2.ASM - low level graphics routines

This is the asm code hacked into a mini graphics library from the Aztec library. This is just level 1 stuff. All that is supported is Set mode (just EGA) , set color , draw line and plot point functions. GRX.C will still support level 2 & 3 functions. The reason I still use this is that it is tiny and fast (not to mention simple).

scr_call( ax , bx , cx , dx )
point( x , y )
line( src_x , src_y , dest_x , dest_y )
lineto( dest_x , dest_y ) (from current position)

Function	scr_call
Include file	GRX.H
Prototype	int scr_call( int ax , int bx , int cx , int dx )
Remarks	Load the 4 registers and do a video interrupt. The return value is what int 10h returns in ax.

Function	ega_plot_pt
Include file	GRX.H
Prototype	void ega_plot_pt( void )
Remarks	Internal ega_plot_pt() routine. This is the lowest level code, tell the EGA controller to plot a pixel. This routine was modified from BYTE (10/85) code

Function	chk_dash_state
Include file	GRX.H
Prototype	void chk_dash_state( void )
Remarks	a Q & D to skip every other dot nope use a skip_cnt nope now use an hardware bit rotate

Function	_pnt
Include file	GRX.H
Prototype	void _pnt( void )
Remarks	Internal _pnt() routine. Just plot a pixel. Everybody uses this routine to draw.

Function	_inline
Include file	GRX.H
Prototype	void _inline( void )
Remarks	Internal line function, everybody comes here to draw the line

Function	point
Include file	GRX.H
Prototype	void point( int x , int y )
Remarks	Plot a point at xy.

Function	line
Include file	GRX.H
Prototype	void line( int src_x , int src_y , int dest_x , int dest_y )
Remarks	Draw a line from src_x/src_y to dest_x/dest_y.

Function	lineto
Include file	GRX.H
Prototype	void lineto( int dest_x , int dest_y )
Remarks	Draw a line from current position to dest_x/dest_y.

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