diff options
Diffstat (limited to 'src/glu/mesa/glu.c')
| -rw-r--r-- | src/glu/mesa/glu.c | 36 |
1 files changed, 31 insertions, 5 deletions
diff --git a/src/glu/mesa/glu.c b/src/glu/mesa/glu.c index c3772e786c5..d7d8b93bdb5 100644 --- a/src/glu/mesa/glu.c +++ b/src/glu/mesa/glu.c @@ -1,9 +1,9 @@ -/* $Id: glu.c,v 1.22 2000/11/13 15:33:17 brianp Exp $ */ +/* $Id: glu.c,v 1.23 2001/01/30 18:08:51 brianp Exp $ */ /* * Mesa 3-D graphics library - * Version: 3.3 - * Copyright (C) 1995-2000 Brian Paul + * Version: 3.5 + * Copyright (C) 1995-2001 Brian Paul * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public @@ -137,6 +137,32 @@ gluOrtho2D(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top) +static void +frustum(GLdouble left, GLdouble right, + GLdouble bottom, GLdouble top, + GLdouble nearval, GLdouble farval) +{ + GLdouble x, y, a, b, c, d; + GLdouble m[16]; + + x = (2.0 * nearval) / (right - left); + y = (2.0 * nearval) / (top - bottom); + a = (right + left) / (right - left); + b = (top + bottom) / (top - bottom); + c = -(farval + nearval) / ( farval - nearval); + d = -(2.0 * farval * nearval) / (farval - nearval); + +#define M(row,col) m[col*4+row] + M(0,0) = x; M(0,1) = 0.0F; M(0,2) = a; M(0,3) = 0.0F; + M(1,0) = 0.0F; M(1,1) = y; M(1,2) = b; M(1,3) = 0.0F; + M(2,0) = 0.0F; M(2,1) = 0.0F; M(2,2) = c; M(2,3) = d; + M(3,0) = 0.0F; M(3,1) = 0.0F; M(3,2) = -1.0F; M(3,3) = 0.0F; +#undef M + + glMultMatrixd(m); +} + + void GLAPIENTRY gluPerspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar) { @@ -144,11 +170,11 @@ gluPerspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar) ymax = zNear * tan(fovy * M_PI / 360.0); ymin = -ymax; - xmin = ymin * aspect; xmax = ymax * aspect; - glFrustum(xmin, xmax, ymin, ymax, zNear, zFar); + /* don't call glFrustum() because of error semantics (covglu) */ + frustum(xmin, xmax, ymin, ymax, zNear, zFar); } |