Descent3/2dlib/pen.cpp

/*
 * $Logfile: /DescentIII/Main/2dlib/pen.cpp $
 * $Revision: 5 $
 * $Date: 12/19/97 5:28p $
 * $Author: Samir $
 *
 * line and rectangle drawing
 *
 * $Log: /DescentIII/Main/2dlib/pen.cpp $
 * 
 * 5     12/19/97 5:28p Samir
 * Took out old rasterization code.  Moved to renderer library.
 * 
 * 4     12/19/97 5:23p Samir
 * Cleaned up a lot of code to call renderer code.
 * 
 * 3     12/19/97 12:31p Samir
 * Better renderer support.
 * 
 * 21    6/16/97 4:45p Samir
 * Added rendering line hooks.
 * 
 * 20    6/12/97 6:29p Samir
 * 
 * 19    6/06/97 12:18p Samir
 * OpenGL HACKS to call renderer for some drawing functions.  Must fix.
 * 
 * 18    5/29/97 5:59p Samir
 * Convert clipping from fix math to float math.
 * 
 * 17    4/11/97 3:56 PM Jeremy
 * replaced calls of ddgr_H/Vline to gr_h/vline
 * 
 * 16    4/08/97 12:53p Samir
 * Fixed  hline clipping fuckup.
 * 
 * 15    4/08/97 11:30a Jason
 * made circles not draw if they are touching the edge ofthe viewport
 * 
 * 14    4/08/97 10:42a Jason
 * fixed bug with hline
 * 
 * 13    4/01/97 4:37p Samir
 * Simply better circle functions using viewport line and pixel functions.
 * made an hline function that clips and a setpixel function that clips.
 * 
 * 12    4/01/97 3:56p Samir
 * Cheap clipping for scanlines.  Should fix this so it's cleaner.
 * 
 * 11    4/01/97 1:51p Samir
 * Fixed clipping of circles.
 * 
 * 10    4/01/97 1:40p Samir
 * Circle functions
 * 
 * 9     3/27/97 11:11a Samir
 * Moved code from ddgr library to 2dlib because it was ANSI compliant and
 * should work on all systems
 * 
 * 8     2/28/97 2:52 PM Jeremy
 * removed inline declaration of grViewport::clip_line
 * 
 * 7     2/27/97 6:14p Samir
 * moved higher level ddgr pen code to this library.
 * 
 * 6     2/07/97 6:04p Matt
 * Renamed vm_FixMulDiv() to FixMulDiv()
 * 
 * 5     2/04/97 11:14a Samir
 * Improved clipping system by adding a separate clipport based off of the
 * viewport's rectangle in it's parent surface
 *
 * $NoKeywords: $
 */

#include "lib2d.h"
#include "pserror.h"


#define CLIP_LEFT (vp_InitLeft+vp_Left)
#define CLIP_TOP (vp_InitTop+vp_Top)
#define CLIP_RIGHT (vp_InitLeft+vp_Right)
#define CLIP_BOTTOM (vp_InitTop+vp_Bottom)


void grViewport::hline(ddgr_color col, int x1, int x2, int y1)
{
	ASSERT(vp_Locked);
		
	x1 = global_x(x1);
	y1 = global_y(y1);
	x2 = global_x(x2);

	if (x1>x2)
	{
		int t=x2;
		x2=x1;
		x1=t;
	}

	if (y1 < CLIP_TOP) return;
	if (y1 > CLIP_BOTTOM) return;
	if (x1 > CLIP_RIGHT) return;
	if (x2 < CLIP_LEFT) return;
	if (x1 < CLIP_LEFT) x1 = CLIP_LEFT;
	if (x2 > CLIP_RIGHT) x2 = CLIP_RIGHT;

	rend_SetFlatColor(col);
	rend_DrawLine(x1,y1,x2,y1);
}


//	grViewport::line
//		draws a clipped line

void grViewport::line(ddgr_color color, int x1, int y1, int x2, int y2)
{
	int xa, ya, xb, yb;
	ASSERT(vp_Locked);

	xa = global_x(x1);
	ya = global_y(y1);
	xb = global_x(x2);
	yb = global_y(y2);
	
	rend_SetFlatColor(color);
	rend_DrawLine(x1,y1,x2,y2);
}

void grViewport::rect(ddgr_color color, int l, int t, int r, int b)
{
	ASSERT(vp_Locked);

	l = global_x(l);
	t = global_y(t);
	r = global_x(r);
	b = global_y(b);

	rend_SetFlatColor(color);
	rend_DrawLine(l,t,r,t);
	rend_DrawLine(r,t,r,b);
	rend_DrawLine(l,b,r,b);
	rend_DrawLine(l,t,l,b);
}


void grViewport::fillrect(ddgr_color color, int l, int t, int r, int b)
{
	ASSERT(vp_Locked);

	l = global_x(l);
	t = global_y(t);
	r = global_x(r);
	b = global_y(b);

	rend_FillRect(color, l, t, r, b);
}


void grViewport::circle(ddgr_color col, int xc, int yc, int r)
{
	ASSERT(vp_Locked);

	xc = global_x(xc);
	yc = global_y(yc);

	rend_SetFlatColor(col);
	rend_DrawCircle(xc,yc,r);
}


void grViewport::fillcircle(ddgr_color col, int xc, int yc, int r)
{
	ASSERT(vp_Locked);

	xc = global_x(xc);
	yc = global_y(yc);

	rend_FillCircle(col, xc, yc, r);
}