-/* $Id: project.c,v 1.2 1999/09/14 00:10:31 brianp Exp $ */
/*
* Mesa 3-D graphics library
- * Version: 3.1
- * Copyright (C) 1995-1999 Brian Paul
+ * Version: 3.3
+ * Copyright (C) 1995-2000 Brian Paul
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
*/
-/*
- * $Log: project.c,v $
- * Revision 1.2 1999/09/14 00:10:31 brianp
- * added gluUnProject4()
- *
- * Revision 1.1.1.1 1999/08/19 00:55:42 jtg
- * Imported sources
- *
- * Revision 1.7 1999/01/03 03:23:15 brianp
- * now using GLAPIENTRY and GLCALLBACK keywords (Ted Jump)
- *
- * Revision 1.6 1998/07/08 01:43:43 brianp
- * new version of invert_matrix() (also in src/matrix.c)
- *
- * Revision 1.5 1997/07/24 01:28:44 brianp
- * changed precompiled header symbol from PCH to PC_HEADER
- *
- * Revision 1.4 1997/05/28 02:29:38 brianp
- * added support for precompiled headers (PCH), inserted APIENTRY keyword
- *
- * Revision 1.3 1997/04/11 23:22:42 brianp
- * added divide by zero checks to gluProject() and gluUnproject()
- *
- * Revision 1.2 1997/01/29 19:05:29 brianp
- * faster invert_matrix() function from Stephane Rehel
- *
- * Revision 1.1 1996/09/27 01:19:39 brianp
- * Initial revision
- *
- */
-
-
#ifdef PC_HEADER
#include "all.h"
#else
* in - the 4x1 vector
* Output: out - the resulting 4x1 vector.
*/
-static void transform_point( GLdouble out[4], const GLdouble m[16],
- const GLdouble in[4] )
+static void
+transform_point(GLdouble out[4], const GLdouble m[16], const GLdouble in[4])
{
#define M(row,col) m[col*4+row]
- out[0] = M(0,0) * in[0] + M(0,1) * in[1] + M(0,2) * in[2] + M(0,3) * in[3];
- out[1] = M(1,0) * in[0] + M(1,1) * in[1] + M(1,2) * in[2] + M(1,3) * in[3];
- out[2] = M(2,0) * in[0] + M(2,1) * in[1] + M(2,2) * in[2] + M(2,3) * in[3];
- out[3] = M(3,0) * in[0] + M(3,1) * in[1] + M(3,2) * in[2] + M(3,3) * in[3];
+ out[0] =
+ M(0, 0) * in[0] + M(0, 1) * in[1] + M(0, 2) * in[2] + M(0, 3) * in[3];
+ out[1] =
+ M(1, 0) * in[0] + M(1, 1) * in[1] + M(1, 2) * in[2] + M(1, 3) * in[3];
+ out[2] =
+ M(2, 0) * in[0] + M(2, 1) * in[1] + M(2, 2) * in[2] + M(2, 3) * in[3];
+ out[3] =
+ M(3, 0) * in[0] + M(3, 1) * in[1] + M(3, 2) * in[2] + M(3, 3) * in[3];
#undef M
}
* Input: a, b - matrices to multiply
* Output: product - product of a and b
*/
-static void matmul( GLdouble *product, const GLdouble *a, const GLdouble *b )
+static void
+matmul(GLdouble * product, const GLdouble * a, const GLdouble * b)
{
/* This matmul was contributed by Thomas Malik */
GLdouble temp[16];
#define T(row,col) temp[(col<<2)+row]
/* i-te Zeile */
- for (i = 0; i < 4; i++)
- {
- T(i, 0) = A(i, 0) * B(0, 0) + A(i, 1) * B(1, 0) + A(i, 2) * B(2, 0) + A(i, 3) * B(3, 0);
- T(i, 1) = A(i, 0) * B(0, 1) + A(i, 1) * B(1, 1) + A(i, 2) * B(2, 1) + A(i, 3) * B(3, 1);
- T(i, 2) = A(i, 0) * B(0, 2) + A(i, 1) * B(1, 2) + A(i, 2) * B(2, 2) + A(i, 3) * B(3, 2);
- T(i, 3) = A(i, 0) * B(0, 3) + A(i, 1) * B(1, 3) + A(i, 2) * B(2, 3) + A(i, 3) * B(3, 3);
- }
+ for (i = 0; i < 4; i++) {
+ T(i, 0) =
+ A(i, 0) * B(0, 0) + A(i, 1) * B(1, 0) + A(i, 2) * B(2, 0) + A(i,
+ 3) *
+ B(3, 0);
+ T(i, 1) =
+ A(i, 0) * B(0, 1) + A(i, 1) * B(1, 1) + A(i, 2) * B(2, 1) + A(i,
+ 3) *
+ B(3, 1);
+ T(i, 2) =
+ A(i, 0) * B(0, 2) + A(i, 1) * B(1, 2) + A(i, 2) * B(2, 2) + A(i,
+ 3) *
+ B(3, 2);
+ T(i, 3) =
+ A(i, 0) * B(0, 3) + A(i, 1) * B(1, 3) + A(i, 2) * B(2, 3) + A(i,
+ 3) *
+ B(3, 3);
+ }
#undef A
#undef B
#undef T
- MEMCPY( product, temp, 16*sizeof(GLdouble) );
+ MEMCPY(product, temp, 16 * sizeof(GLdouble));
}
* Code contributed by Jacques Leroy jle@star.be
* Return GL_TRUE for success, GL_FALSE for failure (singular matrix)
*/
-static GLboolean invert_matrix( const GLdouble *m, GLdouble *out )
+static GLboolean
+invert_matrix(const GLdouble * m, GLdouble * out)
{
/* NB. OpenGL Matrices are COLUMN major. */
#define SWAP_ROWS(a, b) { GLdouble *_tmp = a; (a)=(b); (b)=_tmp; }
#define MAT(m,r,c) (m)[(c)*4+(r)]
- GLdouble wtmp[4][8];
- GLdouble m0, m1, m2, m3, s;
- GLdouble *r0, *r1, *r2, *r3;
-
- r0 = wtmp[0], r1 = wtmp[1], r2 = wtmp[2], r3 = wtmp[3];
-
- r0[0] = MAT(m,0,0), r0[1] = MAT(m,0,1),
- r0[2] = MAT(m,0,2), r0[3] = MAT(m,0,3),
- r0[4] = 1.0, r0[5] = r0[6] = r0[7] = 0.0,
-
- r1[0] = MAT(m,1,0), r1[1] = MAT(m,1,1),
- r1[2] = MAT(m,1,2), r1[3] = MAT(m,1,3),
- r1[5] = 1.0, r1[4] = r1[6] = r1[7] = 0.0,
-
- r2[0] = MAT(m,2,0), r2[1] = MAT(m,2,1),
- r2[2] = MAT(m,2,2), r2[3] = MAT(m,2,3),
- r2[6] = 1.0, r2[4] = r2[5] = r2[7] = 0.0,
-
- r3[0] = MAT(m,3,0), r3[1] = MAT(m,3,1),
- r3[2] = MAT(m,3,2), r3[3] = MAT(m,3,3),
- r3[7] = 1.0, r3[4] = r3[5] = r3[6] = 0.0;
-
- /* choose pivot - or die */
- if (fabs(r3[0])>fabs(r2[0])) SWAP_ROWS(r3, r2);
- if (fabs(r2[0])>fabs(r1[0])) SWAP_ROWS(r2, r1);
- if (fabs(r1[0])>fabs(r0[0])) SWAP_ROWS(r1, r0);
- if (0.0 == r0[0]) return GL_FALSE;
-
- /* eliminate first variable */
- m1 = r1[0]/r0[0]; m2 = r2[0]/r0[0]; m3 = r3[0]/r0[0];
- s = r0[1]; r1[1] -= m1 * s; r2[1] -= m2 * s; r3[1] -= m3 * s;
- s = r0[2]; r1[2] -= m1 * s; r2[2] -= m2 * s; r3[2] -= m3 * s;
- s = r0[3]; r1[3] -= m1 * s; r2[3] -= m2 * s; r3[3] -= m3 * s;
- s = r0[4];
- if (s != 0.0) { r1[4] -= m1 * s; r2[4] -= m2 * s; r3[4] -= m3 * s; }
- s = r0[5];
- if (s != 0.0) { r1[5] -= m1 * s; r2[5] -= m2 * s; r3[5] -= m3 * s; }
- s = r0[6];
- if (s != 0.0) { r1[6] -= m1 * s; r2[6] -= m2 * s; r3[6] -= m3 * s; }
- s = r0[7];
- if (s != 0.0) { r1[7] -= m1 * s; r2[7] -= m2 * s; r3[7] -= m3 * s; }
-
- /* choose pivot - or die */
- if (fabs(r3[1])>fabs(r2[1])) SWAP_ROWS(r3, r2);
- if (fabs(r2[1])>fabs(r1[1])) SWAP_ROWS(r2, r1);
- if (0.0 == r1[1]) return GL_FALSE;
-
- /* eliminate second variable */
- m2 = r2[1]/r1[1]; m3 = r3[1]/r1[1];
- r2[2] -= m2 * r1[2]; r3[2] -= m3 * r1[2];
- r2[3] -= m2 * r1[3]; r3[3] -= m3 * r1[3];
- s = r1[4]; if (0.0 != s) { r2[4] -= m2 * s; r3[4] -= m3 * s; }
- s = r1[5]; if (0.0 != s) { r2[5] -= m2 * s; r3[5] -= m3 * s; }
- s = r1[6]; if (0.0 != s) { r2[6] -= m2 * s; r3[6] -= m3 * s; }
- s = r1[7]; if (0.0 != s) { r2[7] -= m2 * s; r3[7] -= m3 * s; }
-
- /* choose pivot - or die */
- if (fabs(r3[2])>fabs(r2[2])) SWAP_ROWS(r3, r2);
- if (0.0 == r2[2]) return GL_FALSE;
-
- /* eliminate third variable */
- m3 = r3[2]/r2[2];
- r3[3] -= m3 * r2[3], r3[4] -= m3 * r2[4],
- r3[5] -= m3 * r2[5], r3[6] -= m3 * r2[6],
- r3[7] -= m3 * r2[7];
-
- /* last check */
- if (0.0 == r3[3]) return GL_FALSE;
-
- s = 1.0/r3[3]; /* now back substitute row 3 */
- r3[4] *= s; r3[5] *= s; r3[6] *= s; r3[7] *= s;
-
- m2 = r2[3]; /* now back substitute row 2 */
- s = 1.0/r2[2];
- r2[4] = s * (r2[4] - r3[4] * m2), r2[5] = s * (r2[5] - r3[5] * m2),
- r2[6] = s * (r2[6] - r3[6] * m2), r2[7] = s * (r2[7] - r3[7] * m2);
- m1 = r1[3];
- r1[4] -= r3[4] * m1, r1[5] -= r3[5] * m1,
- r1[6] -= r3[6] * m1, r1[7] -= r3[7] * m1;
- m0 = r0[3];
- r0[4] -= r3[4] * m0, r0[5] -= r3[5] * m0,
- r0[6] -= r3[6] * m0, r0[7] -= r3[7] * m0;
-
- m1 = r1[2]; /* now back substitute row 1 */
- s = 1.0/r1[1];
- r1[4] = s * (r1[4] - r2[4] * m1), r1[5] = s * (r1[5] - r2[5] * m1),
- r1[6] = s * (r1[6] - r2[6] * m1), r1[7] = s * (r1[7] - r2[7] * m1);
- m0 = r0[2];
- r0[4] -= r2[4] * m0, r0[5] -= r2[5] * m0,
- r0[6] -= r2[6] * m0, r0[7] -= r2[7] * m0;
-
- m0 = r0[1]; /* now back substitute row 0 */
- s = 1.0/r0[0];
- r0[4] = s * (r0[4] - r1[4] * m0), r0[5] = s * (r0[5] - r1[5] * m0),
- r0[6] = s * (r0[6] - r1[6] * m0), r0[7] = s * (r0[7] - r1[7] * m0);
-
- MAT(out,0,0) = r0[4]; MAT(out,0,1) = r0[5],
- MAT(out,0,2) = r0[6]; MAT(out,0,3) = r0[7],
- MAT(out,1,0) = r1[4]; MAT(out,1,1) = r1[5],
- MAT(out,1,2) = r1[6]; MAT(out,1,3) = r1[7],
- MAT(out,2,0) = r2[4]; MAT(out,2,1) = r2[5],
- MAT(out,2,2) = r2[6]; MAT(out,2,3) = r2[7],
- MAT(out,3,0) = r3[4]; MAT(out,3,1) = r3[5],
- MAT(out,3,2) = r3[6]; MAT(out,3,3) = r3[7];
-
- return GL_TRUE;
+ GLdouble wtmp[4][8];
+ GLdouble m0, m1, m2, m3, s;
+ GLdouble *r0, *r1, *r2, *r3;
+
+ r0 = wtmp[0], r1 = wtmp[1], r2 = wtmp[2], r3 = wtmp[3];
+
+ r0[0] = MAT(m, 0, 0), r0[1] = MAT(m, 0, 1),
+ r0[2] = MAT(m, 0, 2), r0[3] = MAT(m, 0, 3),
+ r0[4] = 1.0, r0[5] = r0[6] = r0[7] = 0.0,
+ r1[0] = MAT(m, 1, 0), r1[1] = MAT(m, 1, 1),
+ r1[2] = MAT(m, 1, 2), r1[3] = MAT(m, 1, 3),
+ r1[5] = 1.0, r1[4] = r1[6] = r1[7] = 0.0,
+ r2[0] = MAT(m, 2, 0), r2[1] = MAT(m, 2, 1),
+ r2[2] = MAT(m, 2, 2), r2[3] = MAT(m, 2, 3),
+ r2[6] = 1.0, r2[4] = r2[5] = r2[7] = 0.0,
+ r3[0] = MAT(m, 3, 0), r3[1] = MAT(m, 3, 1),
+ r3[2] = MAT(m, 3, 2), r3[3] = MAT(m, 3, 3),
+ r3[7] = 1.0, r3[4] = r3[5] = r3[6] = 0.0;
+
+ /* choose pivot - or die */
+ if (fabs(r3[0]) > fabs(r2[0]))
+ SWAP_ROWS(r3, r2);
+ if (fabs(r2[0]) > fabs(r1[0]))
+ SWAP_ROWS(r2, r1);
+ if (fabs(r1[0]) > fabs(r0[0]))
+ SWAP_ROWS(r1, r0);
+ if (0.0 == r0[0])
+ return GL_FALSE;
+
+ /* eliminate first variable */
+ m1 = r1[0] / r0[0];
+ m2 = r2[0] / r0[0];
+ m3 = r3[0] / r0[0];
+ s = r0[1];
+ r1[1] -= m1 * s;
+ r2[1] -= m2 * s;
+ r3[1] -= m3 * s;
+ s = r0[2];
+ r1[2] -= m1 * s;
+ r2[2] -= m2 * s;
+ r3[2] -= m3 * s;
+ s = r0[3];
+ r1[3] -= m1 * s;
+ r2[3] -= m2 * s;
+ r3[3] -= m3 * s;
+ s = r0[4];
+ if (s != 0.0) {
+ r1[4] -= m1 * s;
+ r2[4] -= m2 * s;
+ r3[4] -= m3 * s;
+ }
+ s = r0[5];
+ if (s != 0.0) {
+ r1[5] -= m1 * s;
+ r2[5] -= m2 * s;
+ r3[5] -= m3 * s;
+ }
+ s = r0[6];
+ if (s != 0.0) {
+ r1[6] -= m1 * s;
+ r2[6] -= m2 * s;
+ r3[6] -= m3 * s;
+ }
+ s = r0[7];
+ if (s != 0.0) {
+ r1[7] -= m1 * s;
+ r2[7] -= m2 * s;
+ r3[7] -= m3 * s;
+ }
+
+ /* choose pivot - or die */
+ if (fabs(r3[1]) > fabs(r2[1]))
+ SWAP_ROWS(r3, r2);
+ if (fabs(r2[1]) > fabs(r1[1]))
+ SWAP_ROWS(r2, r1);
+ if (0.0 == r1[1])
+ return GL_FALSE;
+
+ /* eliminate second variable */
+ m2 = r2[1] / r1[1];
+ m3 = r3[1] / r1[1];
+ r2[2] -= m2 * r1[2];
+ r3[2] -= m3 * r1[2];
+ r2[3] -= m2 * r1[3];
+ r3[3] -= m3 * r1[3];
+ s = r1[4];
+ if (0.0 != s) {
+ r2[4] -= m2 * s;
+ r3[4] -= m3 * s;
+ }
+ s = r1[5];
+ if (0.0 != s) {
+ r2[5] -= m2 * s;
+ r3[5] -= m3 * s;
+ }
+ s = r1[6];
+ if (0.0 != s) {
+ r2[6] -= m2 * s;
+ r3[6] -= m3 * s;
+ }
+ s = r1[7];
+ if (0.0 != s) {
+ r2[7] -= m2 * s;
+ r3[7] -= m3 * s;
+ }
+
+ /* choose pivot - or die */
+ if (fabs(r3[2]) > fabs(r2[2]))
+ SWAP_ROWS(r3, r2);
+ if (0.0 == r2[2])
+ return GL_FALSE;
+
+ /* eliminate third variable */
+ m3 = r3[2] / r2[2];
+ r3[3] -= m3 * r2[3], r3[4] -= m3 * r2[4],
+ r3[5] -= m3 * r2[5], r3[6] -= m3 * r2[6], r3[7] -= m3 * r2[7];
+
+ /* last check */
+ if (0.0 == r3[3])
+ return GL_FALSE;
+
+ s = 1.0 / r3[3]; /* now back substitute row 3 */
+ r3[4] *= s;
+ r3[5] *= s;
+ r3[6] *= s;
+ r3[7] *= s;
+
+ m2 = r2[3]; /* now back substitute row 2 */
+ s = 1.0 / r2[2];
+ r2[4] = s * (r2[4] - r3[4] * m2), r2[5] = s * (r2[5] - r3[5] * m2),
+ r2[6] = s * (r2[6] - r3[6] * m2), r2[7] = s * (r2[7] - r3[7] * m2);
+ m1 = r1[3];
+ r1[4] -= r3[4] * m1, r1[5] -= r3[5] * m1,
+ r1[6] -= r3[6] * m1, r1[7] -= r3[7] * m1;
+ m0 = r0[3];
+ r0[4] -= r3[4] * m0, r0[5] -= r3[5] * m0,
+ r0[6] -= r3[6] * m0, r0[7] -= r3[7] * m0;
+
+ m1 = r1[2]; /* now back substitute row 1 */
+ s = 1.0 / r1[1];
+ r1[4] = s * (r1[4] - r2[4] * m1), r1[5] = s * (r1[5] - r2[5] * m1),
+ r1[6] = s * (r1[6] - r2[6] * m1), r1[7] = s * (r1[7] - r2[7] * m1);
+ m0 = r0[2];
+ r0[4] -= r2[4] * m0, r0[5] -= r2[5] * m0,
+ r0[6] -= r2[6] * m0, r0[7] -= r2[7] * m0;
+
+ m0 = r0[1]; /* now back substitute row 0 */
+ s = 1.0 / r0[0];
+ r0[4] = s * (r0[4] - r1[4] * m0), r0[5] = s * (r0[5] - r1[5] * m0),
+ r0[6] = s * (r0[6] - r1[6] * m0), r0[7] = s * (r0[7] - r1[7] * m0);
+
+ MAT(out, 0, 0) = r0[4];
+ MAT(out, 0, 1) = r0[5], MAT(out, 0, 2) = r0[6];
+ MAT(out, 0, 3) = r0[7], MAT(out, 1, 0) = r1[4];
+ MAT(out, 1, 1) = r1[5], MAT(out, 1, 2) = r1[6];
+ MAT(out, 1, 3) = r1[7], MAT(out, 2, 0) = r2[4];
+ MAT(out, 2, 1) = r2[5], MAT(out, 2, 2) = r2[6];
+ MAT(out, 2, 3) = r2[7], MAT(out, 3, 0) = r3[4];
+ MAT(out, 3, 1) = r3[5], MAT(out, 3, 2) = r3[6];
+ MAT(out, 3, 3) = r3[7];
+
+ return GL_TRUE;
#undef MAT
#undef SWAP_ROWS
/* projection du point (objx,objy,obz) sur l'ecran (winx,winy,winz) */
-GLint GLAPIENTRY gluProject(GLdouble objx,GLdouble objy,GLdouble objz,
- const GLdouble model[16],const GLdouble proj[16],
- const GLint viewport[4],
- GLdouble *winx,GLdouble *winy,GLdouble *winz)
+GLint GLAPIENTRY
+gluProject(GLdouble objx, GLdouble objy, GLdouble objz,
+ const GLdouble model[16], const GLdouble proj[16],
+ const GLint viewport[4],
+ GLdouble * winx, GLdouble * winy, GLdouble * winz)
{
- /* matrice de transformation */
- GLdouble in[4],out[4];
-
- /* initilise la matrice et le vecteur a transformer */
- in[0]=objx; in[1]=objy; in[2]=objz; in[3]=1.0;
- transform_point(out,model,in);
- transform_point(in,proj,out);
-
- /* d'ou le resultat normalise entre -1 et 1*/
- if (in[3]==0.0)
- return GL_FALSE;
-
- in[0]/=in[3]; in[1]/=in[3]; in[2]/=in[3];
-
- /* en coordonnees ecran */
- *winx = viewport[0]+(1+in[0])*viewport[2]/2;
- *winy = viewport[1]+(1+in[1])*viewport[3]/2;
- /* entre 0 et 1 suivant z */
- *winz = (1+in[2])/2;
- return GL_TRUE;
+ /* matrice de transformation */
+ GLdouble in[4], out[4];
+
+ /* initilise la matrice et le vecteur a transformer */
+ in[0] = objx;
+ in[1] = objy;
+ in[2] = objz;
+ in[3] = 1.0;
+ transform_point(out, model, in);
+ transform_point(in, proj, out);
+
+ /* d'ou le resultat normalise entre -1 et 1 */
+ if (in[3] == 0.0)
+ return GL_FALSE;
+
+ in[0] /= in[3];
+ in[1] /= in[3];
+ in[2] /= in[3];
+
+ /* en coordonnees ecran */
+ *winx = viewport[0] + (1 + in[0]) * viewport[2] / 2;
+ *winy = viewport[1] + (1 + in[1]) * viewport[3] / 2;
+ /* entre 0 et 1 suivant z */
+ *winz = (1 + in[2]) / 2;
+ return GL_TRUE;
}
/* transformation du point ecran (winx,winy,winz) en point objet */
-GLint GLAPIENTRY gluUnProject(GLdouble winx,GLdouble winy,GLdouble winz,
- const GLdouble model[16],const GLdouble proj[16],
- const GLint viewport[4],
- GLdouble *objx,GLdouble *objy,GLdouble *objz)
+GLint GLAPIENTRY
+gluUnProject(GLdouble winx, GLdouble winy, GLdouble winz,
+ const GLdouble model[16], const GLdouble proj[16],
+ const GLint viewport[4],
+ GLdouble * objx, GLdouble * objy, GLdouble * objz)
{
- /* matrice de transformation */
- GLdouble m[16], A[16];
- GLdouble in[4],out[4];
-
- /* transformation coordonnees normalisees entre -1 et 1 */
- in[0]=(winx-viewport[0])*2/viewport[2] - 1.0;
- in[1]=(winy-viewport[1])*2/viewport[3] - 1.0;
- in[2]=2*winz - 1.0;
- in[3]=1.0;
-
- /* calcul transformation inverse */
- matmul(A,proj,model);
- invert_matrix(A,m);
-
- /* d'ou les coordonnees objets */
- transform_point(out,m,in);
- if (out[3]==0.0)
- return GL_FALSE;
- *objx=out[0]/out[3];
- *objy=out[1]/out[3];
- *objz=out[2]/out[3];
- return GL_TRUE;
+ /* matrice de transformation */
+ GLdouble m[16], A[16];
+ GLdouble in[4], out[4];
+
+ /* transformation coordonnees normalisees entre -1 et 1 */
+ in[0] = (winx - viewport[0]) * 2 / viewport[2] - 1.0;
+ in[1] = (winy - viewport[1]) * 2 / viewport[3] - 1.0;
+ in[2] = 2 * winz - 1.0;
+ in[3] = 1.0;
+
+ /* calcul transformation inverse */
+ matmul(A, proj, model);
+ invert_matrix(A, m);
+
+ /* d'ou les coordonnees objets */
+ transform_point(out, m, in);
+ if (out[3] == 0.0)
+ return GL_FALSE;
+ *objx = out[0] / out[3];
+ *objy = out[1] / out[3];
+ *objz = out[2] / out[3];
+ return GL_TRUE;
}
* New in GLU 1.3
* This is like gluUnProject but also takes near and far DepthRange values.
*/
+#ifdef GLU_VERSION_1_3
GLint GLAPIENTRY
-gluUnProject4( GLdouble winx, GLdouble winy, GLdouble winz, GLdouble clipw,
- const GLdouble modelMatrix[16],
- const GLdouble projMatrix[16],
- const GLint viewport[4],
- GLclampd nearZ, GLclampd farZ,
- GLdouble *objx, GLdouble *objy, GLdouble *objz, GLdouble *objw )
+gluUnProject4(GLdouble winx, GLdouble winy, GLdouble winz, GLdouble clipw,
+ const GLdouble modelMatrix[16],
+ const GLdouble projMatrix[16],
+ const GLint viewport[4],
+ GLclampd nearZ, GLclampd farZ,
+ GLdouble * objx, GLdouble * objy, GLdouble * objz,
+ GLdouble * objw)
{
- /* matrice de transformation */
- GLdouble m[16], A[16];
- GLdouble in[4],out[4];
- GLdouble z = nearZ + winz * (farZ - nearZ);
-
- /* transformation coordonnees normalisees entre -1 et 1 */
- in[0] = (winx-viewport[0])*2/viewport[2] - 1.0;
- in[1] = (winy-viewport[1])*2/viewport[3] - 1.0;
- in[2] = 2.0 * z - 1.0;
- in[3] = clipw;
-
- /* calcul transformation inverse */
- matmul(A,projMatrix,modelMatrix);
- invert_matrix(A,m);
-
- /* d'ou les coordonnees objets */
- transform_point(out,m,in);
- if (out[3]==0.0)
- return GL_FALSE;
- *objx=out[0]/out[3];
- *objy=out[1]/out[3];
- *objz=out[2]/out[3];
- *objw=out[3];
- return GL_TRUE;
+ /* matrice de transformation */
+ GLdouble m[16], A[16];
+ GLdouble in[4], out[4];
+ GLdouble z = nearZ + winz * (farZ - nearZ);
+
+ /* transformation coordonnees normalisees entre -1 et 1 */
+ in[0] = (winx - viewport[0]) * 2 / viewport[2] - 1.0;
+ in[1] = (winy - viewport[1]) * 2 / viewport[3] - 1.0;
+ in[2] = 2.0 * z - 1.0;
+ in[3] = clipw;
+
+ /* calcul transformation inverse */
+ matmul(A, projMatrix, modelMatrix);
+ invert_matrix(A, m);
+
+ /* d'ou les coordonnees objets */
+ transform_point(out, m, in);
+ if (out[3] == 0.0)
+ return GL_FALSE;
+ *objx = out[0] / out[3];
+ *objy = out[1] / out[3];
+ *objz = out[2] / out[3];
+ *objw = out[3];
+ return GL_TRUE;
}
+#endif
projects / mesa.git / blobdiff