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added gluUnProject4()

This commit is contained in:
Brian Paul 1999-09-14 00:10:31 +00:00
parent d1603d4a46
commit daa0b0f656
1 changed files with 44 additions and 11 deletions
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55
src/glu/mesa/project.c
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@ -1,4 +1,4 @@
/* $Id: project.c,v 1.1 1999/08/19 00:55:42 jtg Exp $ */
/* $Id: project.c,v 1.2 1999/09/14 00:10:31 brianp Exp $ */
/*
* Mesa 3-D graphics library
@ -23,8 +23,11 @@
/*
* $Log: project.c,v $
* Revision 1.1 1999/08/19 00:55:42 jtg
* Initial revision
* 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)
@ -123,14 +126,6 @@ static void matmul( GLdouble *product, const GLdouble *a, const GLdouble *b )
}
static GLdouble Identity[16] = {
1.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0
};
/*
* Compute inverse of 4x4 transformation matrix.
@ -316,3 +311,41 @@ GLint GLAPIENTRY gluUnProject(GLdouble winx,GLdouble winy,GLdouble winz,
return GL_TRUE;
}
/*
* New in GLU 1.3
* This is like gluUnProject but also takes near and far DepthRange values.
*/
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 )
{
/* 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;
}