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/* $Id: interp.h,v 1.2 1996/09/25 02:01:28 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 2.0
* Copyright (C) 1995-1996 Brian Paul
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* $Log: interp.h,v $
* Revision 1.2 1996/09/25 02:01:28 brianp
* removed gl_interp_texcoords() and gl_interp_texcoords2()
*
* Revision 1.1 1996/09/13 01:38:16 brianp
* Initial revision
*
*/
#ifndef INTERP_H
#define INTERP_H
#include "types.h"
/*
* Various integer interpolation functions and macros
*/
extern void gl_interpolate_z( GLint n, GLint z0, GLint z1, GLdepth zspan[] );
extern void gl_interpolate_i( GLint n, GLint y0, GLint y1, GLint yspan[] );
extern void gl_interpolate_rgba( GLint n,
GLfixed r0, GLfixed r1, GLubyte rspan[],
GLfixed g0, GLfixed g1, GLubyte gspan[],
GLfixed b0, GLfixed b1, GLubyte bspan[],
GLfixed a0, GLfixed a1, GLubyte aspan[] );
#ifdef DEBUG
#define GL_INTERPOLATE_Z(N,Z0,Z1,ZSPAN) gl_interpolate_z(N,Z0,Z1,ZSPAN)
#else
#define GL_INTERPOLATE_Z(N,Z0,Z1,ZSPAN) \
{ \
GLint zz0, zz1, dzz, ii; \
switch (N) { \
case 1: \
ZSPAN[0] = Z0; \
break; \
case 2: \
ZSPAN[0] = Z0; \
ZSPAN[1] = Z1; \
break; \
case 3: \
ZSPAN[0] = Z0; \
ZSPAN[1] = ((Z0)+(Z1)) >> 1; \
ZSPAN[2] = Z1; \
break; \
default: \
zz0 = (Z0) << 7; \
zz1 = (Z1) << 7; \
dzz = (zz1-zz0) / ((N)-1); \
for (ii=0;ii<(N);ii++) { \
ZSPAN[ii] = zz0 >> 7; \
zz0 += dzz; \
} \
} \
}
#endif /*DEBUG*/
/*
* Macro version of gl_interpolate_rgba()
*/
#define GL_INTERPOLATE_RGBA( N, R0,R1,R, G0,G1,G, B0,B1,B, A0,A1,A ) \
if ((N)<2) { \
R[0] = FixedToInt(R0); \
G[0] = FixedToInt(G0); \
B[0] = FixedToInt(B0); \
A[0] = FixedToInt(A0); \
} \
else if ((N)==2) { \
R[0] = FixedToInt(R0); \
R[1] = FixedToInt(R1); \
G[0] = FixedToInt(G0); \
G[1] = FixedToInt(G1); \
B[0] = FixedToInt(B0); \
B[1] = FixedToInt(B1); \
A[0] = FixedToInt(A0); \
A[1] = FixedToInt(A1); \
} \
else { \
GLfixed r0, dr, g0, dg, b0, db, a0, da; \
GLint ii, nn = (GLint) (N) - 1; \
r0 = R0; dr = (R1-r0) / nn; \
g0 = G0; dg = (G1-g0) / nn; \
b0 = B0; db = (B1-b0) / nn; \
a0 = A0; da = (A1-a0) / nn; \
for (ii=0;ii<(N);ii++) { \
R[ii] = FixedToInt(r0); r0+=dr; \
G[ii] = FixedToInt(g0); g0+=dg; \
B[ii] = FixedToInt(b0); b0+=db; \
A[ii] = FixedToInt(a0); a0+=da; \
} \
}
#endif /* INTERP_H */
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