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/*
* Copyright (C) Volition, Inc. 1999. All rights reserved.
*
* All source code herein is the property of Volition, Inc. You may not sell
* or otherwise commercially exploit the source or things you created based on the
* source.
*
*/
#ifndef _LINE_H
#define _LINE_H
//void gr8_line(int x1,int y1,int x2,int y2, bool b);
//void gr8_aaline(vertex *v1, vertex *v2);
#define INT_EXCHG(a,b) do { \
int __temp__ = (a); \
(a) = (b); \
(b) = __temp__; \
} while(0)
//#define INT_SCALE(var,arg,num,den) ((var) = ((arg) * (num)) / (den))
#define INT_SCALE(var,arg,num,den) ((var) = MulDiv(arg, num, den))
#define INT_CLIPLINE(x1,y1,x2,y2,XMIN,YMIN,XMAX,YMAX,WHEN_OUTSIDE,WHEN_CLIPPED,WHEN_SWAPPED) do { \
int temp; \
\
if(y1 > y2) \
{ INT_EXCHG(y1,y2); INT_EXCHG(x1,x2); WHEN_SWAPPED; } \
if((y2 < YMIN) || (y1 > YMAX)) \
{ WHEN_OUTSIDE; } \
if(x1 < x2) { \
if((x2 < XMIN) || (x1 > XMAX)) { \
WHEN_OUTSIDE; \
} \
if(x1 < XMIN) { \
INT_SCALE(temp,(y2 - y1),(XMIN - x1),(x2 - x1)); \
if((y1 += temp) > YMAX) { WHEN_OUTSIDE; } \
x1 = XMIN; \
WHEN_CLIPPED; \
} \
if(x2 > XMAX) { \
INT_SCALE(temp,(y2 - y1),(x2 - XMAX),(x2 - x1)); \
if((y2 -= temp) < YMIN) { WHEN_OUTSIDE; } \
x2 = XMAX; \
WHEN_CLIPPED; \
} \
if(y1 < YMIN) { \
INT_SCALE(temp,(x2 - x1),(YMIN - y1),(y2 - y1)); \
x1 += temp; \
y1 = YMIN; \
WHEN_CLIPPED; \
} \
if(y2 > YMAX) { \
INT_SCALE(temp,(x2 - x1),(y2 - YMAX),(y2 - y1)); \
x2 -= temp; \
y2 = YMAX; \
WHEN_CLIPPED; \
} \
} \
else { \
if((x1 < XMIN) || (x2 > XMAX)) { \
WHEN_OUTSIDE; \
} \
if(x1 > XMAX) { \
INT_SCALE(temp,(y2 - y1),(x1 - XMAX),(x1 - x2)); \
if((y1 += temp) > YMAX) { WHEN_OUTSIDE; } \
x1 = XMAX; \
WHEN_CLIPPED; \
} \
if(x2 < XMIN) { \
INT_SCALE(temp,(y2 - y1),(XMIN - x2),(x1 - x2)); \
if((y2 -= temp) < YMIN) { WHEN_OUTSIDE; } \
x2 = XMIN; \
WHEN_CLIPPED; \
} \
if(y1 < YMIN) { \
INT_SCALE(temp,(x1 - x2),(YMIN - y1),(y2 - y1)); \
x1 -= temp; \
y1 = YMIN; \
WHEN_CLIPPED; \
} \
if(y2 > YMAX) { \
INT_SCALE(temp,(x1 - x2),(y2 - YMAX),(y2 - y1)); \
x2 += temp; \
y2 = YMAX; \
WHEN_CLIPPED; \
} \
} \
} while(0)
#define FL_EXCHG(a,b) do { \
float __temp__ = (a); \
(a) = (b); \
(b) = __temp__; \
} while(0)
#define FL_SCALE(var,arg,num,den) ((var) = ((arg) * (num)) / (den))
#define FL_CLIPLINE(x1,y1,x2,y2,XMIN,YMIN,XMAX,YMAX,WHEN_OUTSIDE,WHEN_CLIPPED,WHEN_SWAPPED) do { \
float temp; \
\
if(y1 > y2) \
{ FL_EXCHG(y1,y2); FL_EXCHG(x1,x2); WHEN_SWAPPED; } \
if((y2 < YMIN) || (y1 > YMAX)) \
{ WHEN_OUTSIDE; } \
if(x1 < x2) { \
if((x2 < XMIN) || (x1 > XMAX)) { \
WHEN_OUTSIDE; \
} \
if(x1 < XMIN) { \
FL_SCALE(temp,(y2 - y1),(XMIN - x1),(x2 - x1)); \
if((y1 += temp) > YMAX) { WHEN_OUTSIDE; } \
x1 = XMIN; \
WHEN_CLIPPED; \
} \
if(x2 > XMAX) { \
FL_SCALE(temp,(y2 - y1),(x2 - XMAX),(x2 - x1)); \
if((y2 -= temp) < YMIN) { WHEN_OUTSIDE; } \
x2 = XMAX; \
WHEN_CLIPPED; \
} \
if(y1 < YMIN) { \
FL_SCALE(temp,(x2 - x1),(YMIN - y1),(y2 - y1)); \
x1 += temp; \
y1 = YMIN; \
WHEN_CLIPPED; \
} \
if(y2 > YMAX) { \
FL_SCALE(temp,(x2 - x1),(y2 - YMAX),(y2 - y1)); \
x2 -= temp; \
y2 = YMAX; \
WHEN_CLIPPED; \
} \
} \
else { \
if((x1 < XMIN) || (x2 > XMAX)) { \
WHEN_OUTSIDE; \
} \
if(x1 > XMAX) { \
FL_SCALE(temp,(y2 - y1),(x1 - XMAX),(x1 - x2)); \
if((y1 += temp) > YMAX) { WHEN_OUTSIDE; } \
x1 = XMAX; \
WHEN_CLIPPED; \
} \
if(x2 < XMIN) { \
FL_SCALE(temp,(y2 - y1),(XMIN - x2),(x1 - x2)); \
if((y2 -= temp) < YMIN) { WHEN_OUTSIDE; } \
x2 = XMIN; \
WHEN_CLIPPED; \
} \
if(y1 < YMIN) { \
FL_SCALE(temp,(x1 - x2),(YMIN - y1),(y2 - y1)); \
x1 -= temp; \
y1 = YMIN; \
WHEN_CLIPPED; \
} \
if(y2 > YMAX) { \
FL_SCALE(temp,(x1 - x2),(y2 - YMAX),(y2 - y1)); \
x2 += temp; \
y2 = YMAX; \
WHEN_CLIPPED; \
} \
} \
} while(0)
#endif
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