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- /* $Id: glu.c,v 1.16.2.2 1999/11/22 22:18:13 brianp Exp $ */
-
- /*
- * Mesa 3-D graphics library
- * Version: 3.1
- * Copyright (C) 1995-1999 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: glu.c,v $
- * Revision 1.16.2.2 1999/11/22 22:18:13 brianp
- * removed GLU_EXT_get_proc_address from ext string
- *
- * Revision 1.16.2.1 1999/11/19 21:22:07 brianp
- * replace encounteed with encountered
- *
- * Revision 1.16 1999/10/27 09:47:41 brianp
- * disabled gluGetProcAddressEXT
- *
- * Revision 1.15 1999/09/19 02:03:19 tjump
- * More Win32 build compliance fixups
- *
- * Revision 1.14 1999/09/17 12:21:53 brianp
- * glGetProcAddressEXT changes to accomodate Win32 and non-Win32
- *
- * Revision 1.13 1999/09/17 03:17:18 tjump
- * Patch error fixup
- *
- * Revision 1.12 1999/09/17 03:07:28 tjump
- * Win32 build req't updates
- *
- * Revision 1.11 1999/09/17 01:00:38 brianp
- * fixed typo
- *
- * Revision 1.10 1999/09/17 00:06:14 brianp
- * gluGetProcAddressEXT change for C++ / BeOS
- *
- * Revision 1.9 1999/09/16 22:37:56 brianp
- * added some casts in gluGetProcAddressEXT()
- *
- * Revision 1.8 1999/09/16 16:53:28 brianp
- * clean-up of GLU_EXT_get_proc_address
- *
- * Revision 1.7 1999/09/14 00:11:40 brianp
- * added gluCheckExtension()
- *
- * Revision 1.6 1999/09/13 14:31:32 joukj
- *
- * strcmp needs the string.h
- *
- * Revision 1.5 1999/09/11 12:04:54 brianp
- * added 1.2 function to gluGetProcAddressEXT()
- *
- * Revision 1.4 1999/09/11 11:36:26 brianp
- * added GLU_EXT_get_proc_address
- *
- * Revision 1.3 1999/09/10 04:32:10 gareth
- * Fixed triangle output, recovery process termination.
- *
- * Revision 1.2 1999/09/10 02:03:31 gareth
- * Added GLU 1.3 tessellation (except winding rule code).
- *
- * Revision 1.1.1.1 1999/08/19 00:55:42 jtg
- * Imported sources
- *
- * Revision 1.13 1999/03/31 19:07:28 brianp
- * added GL_EXT_abgr to extensions
- *
- * Revision 1.12 1999/02/06 06:12:41 brianp
- * updated version string to 3.1
- *
- * Revision 1.11 1999/01/03 03:23:15 brianp
- * now using GLAPIENTRY and GLCALLBACK keywords (Ted Jump)
- *
- * Revision 1.10 1998/04/22 00:35:50 brianp
- * changed version to 3.0
- *
- * Revision 1.9 1997/12/09 03:03:32 brianp
- * changed version to 2.6
- *
- * Revision 1.8 1997/10/04 01:30:20 brianp
- * changed version to 2.5
- *
- * Revision 1.7 1997/08/13 01:25:21 brianp
- * changed version string to 2.4
- *
- * Revision 1.6 1997/07/24 01:28:44 brianp
- * changed precompiled header symbol from PCH to PC_HEADER
- *
- * Revision 1.5 1997/07/13 22:59:11 brianp
- * added const to viewport parameter of gluPickMatrix()
- *
- * Revision 1.4 1997/05/28 02:29:38 brianp
- * added support for precompiled headers (PCH), inserted APIENTRY keyword
- *
- * Revision 1.3 1997/04/12 16:19:02 brianp
- * changed version to 2.3
- *
- * Revision 1.2 1997/03/11 00:58:34 brianp
- * changed version to 2.2
- *
- * Revision 1.1 1996/09/27 01:19:39 brianp
- * Initial revision
- *
- */
-
-
- #ifdef PC_HEADER
- #include "all.h"
- #else
- #include <assert.h>
- #include <math.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include "gluP.h"
- #endif
-
-
- /*
- * Miscellaneous utility functions
- */
-
-
- #ifndef M_PI
- #define M_PI 3.1415926536
- #endif
- #define EPS 0.00001
-
-
-
-
- void GLAPIENTRY gluLookAt( GLdouble eyex, GLdouble eyey, GLdouble eyez,
- GLdouble centerx, GLdouble centery, GLdouble centerz,
- GLdouble upx, GLdouble upy, GLdouble upz )
- {
- GLdouble m[16];
- GLdouble x[3], y[3], z[3];
- GLdouble mag;
-
- /* Make rotation matrix */
-
- /* Z vector */
- z[0] = eyex - centerx;
- z[1] = eyey - centery;
- z[2] = eyez - centerz;
- mag = sqrt( z[0]*z[0] + z[1]*z[1] + z[2]*z[2] );
- if (mag) { /* mpichler, 19950515 */
- z[0] /= mag;
- z[1] /= mag;
- z[2] /= mag;
- }
-
- /* Y vector */
- y[0] = upx;
- y[1] = upy;
- y[2] = upz;
-
- /* X vector = Y cross Z */
- x[0] = y[1]*z[2] - y[2]*z[1];
- x[1] = -y[0]*z[2] + y[2]*z[0];
- x[2] = y[0]*z[1] - y[1]*z[0];
-
- /* Recompute Y = Z cross X */
- y[0] = z[1]*x[2] - z[2]*x[1];
- y[1] = -z[0]*x[2] + z[2]*x[0];
- y[2] = z[0]*x[1] - z[1]*x[0];
-
- /* mpichler, 19950515 */
- /* cross product gives area of parallelogram, which is < 1.0 for
- * non-perpendicular unit-length vectors; so normalize x, y here
- */
-
- mag = sqrt( x[0]*x[0] + x[1]*x[1] + x[2]*x[2] );
- if (mag) {
- x[0] /= mag;
- x[1] /= mag;
- x[2] /= mag;
- }
-
- mag = sqrt( y[0]*y[0] + y[1]*y[1] + y[2]*y[2] );
- if (mag) {
- y[0] /= mag;
- y[1] /= mag;
- y[2] /= mag;
- }
-
- #define M(row,col) m[col*4+row]
- M(0,0) = x[0]; M(0,1) = x[1]; M(0,2) = x[2]; M(0,3) = 0.0;
- M(1,0) = y[0]; M(1,1) = y[1]; M(1,2) = y[2]; M(1,3) = 0.0;
- M(2,0) = z[0]; M(2,1) = z[1]; M(2,2) = z[2]; M(2,3) = 0.0;
- M(3,0) = 0.0; M(3,1) = 0.0; M(3,2) = 0.0; M(3,3) = 1.0;
- #undef M
- glMultMatrixd( m );
-
- /* Translate Eye to Origin */
- glTranslated( -eyex, -eyey, -eyez );
-
- }
-
-
-
- void GLAPIENTRY gluOrtho2D( GLdouble left, GLdouble right,
- GLdouble bottom, GLdouble top )
- {
- glOrtho( left, right, bottom, top, -1.0, 1.0 );
- }
-
-
-
- void GLAPIENTRY gluPerspective( GLdouble fovy, GLdouble aspect,
- GLdouble zNear, GLdouble zFar )
- {
- GLdouble xmin, xmax, ymin, ymax;
-
- ymax = zNear * tan( fovy * M_PI / 360.0 );
- ymin = -ymax;
-
- xmin = ymin * aspect;
- xmax = ymax * aspect;
-
- glFrustum( xmin, xmax, ymin, ymax, zNear, zFar );
- }
-
-
-
- void GLAPIENTRY gluPickMatrix( GLdouble x, GLdouble y,
- GLdouble width, GLdouble height,
- const GLint viewport[4] )
- {
- GLfloat m[16];
- GLfloat sx, sy;
- GLfloat tx, ty;
-
- sx = viewport[2] / width;
- sy = viewport[3] / height;
- tx = (viewport[2] + 2.0 * (viewport[0] - x)) / width;
- ty = (viewport[3] + 2.0 * (viewport[1] - y)) / height;
-
- #define M(row,col) m[col*4+row]
- M(0,0) = sx; M(0,1) = 0.0; M(0,2) = 0.0; M(0,3) = tx;
- M(1,0) = 0.0; M(1,1) = sy; M(1,2) = 0.0; M(1,3) = ty;
- M(2,0) = 0.0; M(2,1) = 0.0; M(2,2) = 1.0; M(2,3) = 0.0;
- M(3,0) = 0.0; M(3,1) = 0.0; M(3,2) = 0.0; M(3,3) = 1.0;
- #undef M
-
- glMultMatrixf( m );
- }
-
-
-
- const GLubyte* GLAPIENTRY gluErrorString( GLenum errorCode )
- {
- static char *tess_error[] = {
- "missing gluBeginPolygon",
- "missing gluBeginContour",
- "missing gluEndPolygon",
- "missing gluEndContour",
- "misoriented or self-intersecting loops",
- "coincident vertices",
- "colinear vertices",
- "FIST recovery process fatal error"
- };
- static char *nurbs_error[] = {
- "spline order un-supported",
- "too few knots",
- "valid knot range is empty",
- "decreasing knot sequence knot",
- "knot multiplicity greater than order of spline",
- "endcurve() must follow bgncurve()",
- "bgncurve() must precede endcurve()",
- "missing or extra geometric data",
- "can't draw pwlcurves",
- "missing bgncurve()",
- "missing bgnsurface()",
- "endtrim() must precede endsurface()",
- "bgnsurface() must precede endsurface()",
- "curve of improper type passed as trim curve",
- "bgnsurface() must precede bgntrim()",
- "endtrim() must follow bgntrim()",
- "bgntrim() must precede endtrim()",
- "invalid or missing trim curve",
- "bgntrim() must precede pwlcurve()",
- "pwlcurve referenced twice",
- "pwlcurve and nurbscurve mixed",
- "improper usage of trim data type",
- "nurbscurve referenced twice",
- "nurbscurve and pwlcurve mixed",
- "nurbssurface referenced twice",
- "invalid property",
- "endsurface() must follow bgnsurface()",
- "misoriented trim curves",
- "intersecting trim curves",
- "UNUSED",
- "unconnected trim curves",
- "unknown knot error",
- "negative vertex count encountered",
- "negative byte-stride encountered",
- "unknown type descriptor",
- "null control array or knot vector",
- "duplicate point on pwlcurve"
- };
-
- /* GL Errors */
- if (errorCode==GL_NO_ERROR) {
- return (GLubyte *) "no error";
- }
- else if (errorCode==GL_INVALID_VALUE) {
- return (GLubyte *) "invalid value";
- }
- else if (errorCode==GL_INVALID_ENUM) {
- return (GLubyte *) "invalid enum";
- }
- else if (errorCode==GL_INVALID_OPERATION) {
- return (GLubyte *) "invalid operation";
- }
- else if (errorCode==GL_STACK_OVERFLOW) {
- return (GLubyte *) "stack overflow";
- }
- else if (errorCode==GL_STACK_UNDERFLOW) {
- return (GLubyte *) "stack underflow";
- }
- else if (errorCode==GL_OUT_OF_MEMORY) {
- return (GLubyte *) "out of memory";
- }
- /* GLU Errors */
- else if (errorCode==GLU_NO_ERROR) {
- return (GLubyte *) "no error";
- }
- else if (errorCode==GLU_INVALID_ENUM) {
- return (GLubyte *) "invalid enum";
- }
- else if (errorCode==GLU_INVALID_VALUE) {
- return (GLubyte *) "invalid value";
- }
- else if (errorCode==GLU_OUT_OF_MEMORY) {
- return (GLubyte *) "out of memory";
- }
- else if (errorCode==GLU_INCOMPATIBLE_GL_VERSION) {
- return (GLubyte *) "incompatible GL version";
- }
- else if (errorCode>=GLU_TESS_ERROR1 && errorCode<=GLU_TESS_ERROR8) {
- return (GLubyte *) tess_error[errorCode-GLU_TESS_ERROR1];
- }
- else if (errorCode>=GLU_NURBS_ERROR1 && errorCode<=GLU_NURBS_ERROR37) {
- return (GLubyte *) nurbs_error[errorCode-GLU_NURBS_ERROR1];
- }
- else {
- return NULL;
- }
- }
-
-
-
- /*
- * New in GLU 1.1
- */
-
- const GLubyte* GLAPIENTRY gluGetString( GLenum name )
- {
- static char *extensions = "GL_EXT_abgr";
- static char *version = "1.2 Mesa 3.1";
-
- switch (name) {
- case GLU_EXTENSIONS:
- return (GLubyte *) extensions;
- case GLU_VERSION:
- return (GLubyte *) version;
- default:
- return NULL;
- }
- }
-
-
-
- #if 0 /* gluGetProcAddressEXT not finalized yet! */
-
- #ifdef __cplusplus
- /* for BeOS R4.5 */
- void GLAPIENTRY (*gluGetProcAddressEXT(const GLubyte *procName))(...)
- #else
- void (GLAPIENTRY *gluGetProcAddressEXT(const GLubyte *procName))()
- #endif
- {
- struct proc {
- const char *name;
- void *address;
- };
- static struct proc procTable[] = {
- { "gluGetProcAddressEXT", (void *) gluGetProcAddressEXT }, /* me! */
-
- /* new 1.1 functions */
- { "gluGetString", (void *) gluGetString },
-
- /* new 1.2 functions */
- { "gluTessBeginPolygon", (void *) gluTessBeginPolygon },
- { "gluTessBeginContour", (void *) gluTessBeginContour },
- { "gluTessEndContour", (void *) gluTessEndContour },
- { "gluTessEndPolygon", (void *) gluTessEndPolygon },
- { "gluGetTessProperty", (void *) gluGetTessProperty },
-
- /* new 1.3 functions */
-
- { NULL, NULL }
- };
- GLuint i;
-
- for (i = 0; procTable[i].address; i++) {
- if (strcmp((const char *) procName, procTable[i].name) == 0)
- return (void (GLAPIENTRY *)()) procTable[i].address;
- }
-
- return NULL;
- }
-
- #endif
-
-
-
- /*
- * New in GLU 1.3
- */
- GLboolean GLAPIENTRY
- gluCheckExtension( const char *extName, const GLubyte *extString )
- {
- assert(extName);
- assert(extString);
- {
- const int len = strlen(extName);
- const char *start = (const char *) extString;
-
- while (1) {
- const char *c = strstr( start, extName );
- if (!c)
- return GL_FALSE;
-
- if ((c == start || c[-1] == ' ') && (c[len] == ' ' || c[len] == 0))
- return GL_TRUE;
-
- start = c + len;
- }
- }
- }
-