SGI SI GLU library

1 files changed, 1164 insertions, 0 deletions

diff --git a/src/glu/sgi/libutil/quad.c b/src/glu/sgi/libutil/quad.c
new file mode 100644
index 00000000000..84a4d7161a3
--- /dev/null
+++ b/src/glu/sgi/libutil/quad.c
@@ -0,0 +1,1164 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+** 
+** http://oss.sgi.com/projects/FreeB
+** 
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+** 
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+** 
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+**
+** $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+** $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libutil/quad.c,v 1.1 2001/03/17 00:25:41 brianp Exp $
+*/
+
+#include "gluos.h"
+#include "gluint.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/gl.h>
+#include <GL/glu.h>
+
+/* Make it not a power of two to avoid cache thrashing on the chip */
+#define CACHE_SIZE	240
+
+#define PI            3.14159265358979323846
+
+struct GLUquadric {
+    GLint 	normals;
+    GLboolean	textureCoords;
+    GLint	orientation;
+    GLint	drawStyle;
+    void	(GLAPIENTRY *errorCallback)( GLint );
+};
+
+GLUquadric * GLAPIENTRY
+gluNewQuadric(void)
+{
+    GLUquadric *newstate;
+
+    newstate = (GLUquadric *) malloc(sizeof(GLUquadric));
+    if (newstate == NULL) {
+	/* Can't report an error at this point... */
+	return NULL;
+    }
+    newstate->normals = GLU_SMOOTH;
+    newstate->textureCoords = GL_FALSE;
+    newstate->orientation = GLU_OUTSIDE;
+    newstate->drawStyle = GLU_FILL;
+    newstate->errorCallback = NULL; 
+    return newstate;
+}
+
+
+void GLAPIENTRY
+gluDeleteQuadric(GLUquadric *state)
+{
+    free(state);
+}
+
+static void gluQuadricError(GLUquadric *qobj, GLenum which)
+{
+    if (qobj->errorCallback) {
+	qobj->errorCallback(which);
+    }
+}
+
+void GLAPIENTRY
+gluQuadricCallback(GLUquadric *qobj, GLenum which, void (GLAPIENTRY *fn)())
+{
+    switch (which) {
+      case GLU_ERROR:
+	qobj->errorCallback = (void (GLAPIENTRY *)(GLint)) fn;
+	break;
+      default:
+	gluQuadricError(qobj, GLU_INVALID_ENUM);
+	return;
+    }
+}
+
+void GLAPIENTRY
+gluQuadricNormals(GLUquadric *qobj, GLenum normals)
+{
+    switch (normals) {
+      case GLU_SMOOTH:
+      case GLU_FLAT:
+      case GLU_NONE:
+	break;
+      default:
+	gluQuadricError(qobj, GLU_INVALID_ENUM);
+	return;
+    }
+    qobj->normals = normals;
+}
+
+void GLAPIENTRY
+gluQuadricTexture(GLUquadric *qobj, GLboolean textureCoords)
+{
+    qobj->textureCoords = textureCoords;
+}
+
+void GLAPIENTRY
+gluQuadricOrientation(GLUquadric *qobj, GLenum orientation)
+{
+    switch(orientation) {
+      case GLU_OUTSIDE:
+      case GLU_INSIDE:
+	break;
+      default:
+	gluQuadricError(qobj, GLU_INVALID_ENUM);
+	return;
+    }
+    qobj->orientation = orientation;
+}
+
+void GLAPIENTRY
+gluQuadricDrawStyle(GLUquadric *qobj, GLenum drawStyle)
+{
+    switch(drawStyle) {
+      case GLU_POINT:
+      case GLU_LINE:
+      case GLU_FILL:
+      case GLU_SILHOUETTE:
+	break;
+      default:
+	gluQuadricError(qobj, GLU_INVALID_ENUM);
+	return;
+    }
+    qobj->drawStyle = drawStyle;
+}
+
+void GLAPIENTRY
+gluCylinder(GLUquadric *qobj, GLdouble baseRadius, GLdouble topRadius, 
+		GLdouble height, GLint slices, GLint stacks)
+{
+    GLint i,j,max;
+    GLfloat sinCache[CACHE_SIZE];
+    GLfloat cosCache[CACHE_SIZE];
+    GLfloat sinCache2[CACHE_SIZE];
+    GLfloat cosCache2[CACHE_SIZE];
+    GLfloat sinCache3[CACHE_SIZE];
+    GLfloat cosCache3[CACHE_SIZE];
+    GLfloat angle;
+    GLfloat x, y, zLow, zHigh;
+    GLfloat sintemp, costemp;
+    GLfloat length;
+    GLfloat deltaRadius;
+    GLfloat zNormal;
+    GLfloat xyNormalRatio;
+    GLfloat radiusLow, radiusHigh;
+    int needCache2, needCache3;
+
+    if (slices >= CACHE_SIZE) slices = CACHE_SIZE-1;
+
+    if (slices < 2 || stacks < 1 || baseRadius < 0.0 || topRadius < 0.0 ||
+	    height < 0.0) {
+	gluQuadricError(qobj, GLU_INVALID_VALUE);
+	return;
+    }
+
+    /* Compute length (needed for normal calculations) */
+    deltaRadius = baseRadius - topRadius;
+    length = SQRT(deltaRadius*deltaRadius + height*height);
+    if (length == 0.0) {
+	gluQuadricError(qobj, GLU_INVALID_VALUE);
+	return;
+    }
+
+    /* Cache is the vertex locations cache */
+    /* Cache2 is the various normals at the vertices themselves */
+    /* Cache3 is the various normals for the faces */
+    needCache2 = needCache3 = 0;
+    if (qobj->normals == GLU_SMOOTH) {
+	needCache2 = 1;
+    }
+
+    if (qobj->normals == GLU_FLAT) {
+	if (qobj->drawStyle != GLU_POINT) {
+	    needCache3 = 1;
+	}
+	if (qobj->drawStyle == GLU_LINE) {
+	    needCache2 = 1;
+	}
+    }
+
+    zNormal = deltaRadius / length;
+    xyNormalRatio = height / length;
+
+    for (i = 0; i < slices; i++) {
+	angle = 2 * PI * i / slices;
+	if (needCache2) {
+	    if (qobj->orientation == GLU_OUTSIDE) {
+		sinCache2[i] = xyNormalRatio * SIN(angle);
+		cosCache2[i] = xyNormalRatio * COS(angle);
+	    } else {
+		sinCache2[i] = -xyNormalRatio * SIN(angle);
+		cosCache2[i] = -xyNormalRatio * COS(angle);
+	    }
+	} 
+	sinCache[i] = SIN(angle);
+	cosCache[i] = COS(angle);
+    }
+
+    if (needCache3) {
+	for (i = 0; i < slices; i++) {
+	    angle = 2 * PI * (i-0.5) / slices;
+	    if (qobj->orientation == GLU_OUTSIDE) {
+		sinCache3[i] = xyNormalRatio * SIN(angle);
+		cosCache3[i] = xyNormalRatio * COS(angle);
+	    } else {
+		sinCache3[i] = -xyNormalRatio * SIN(angle);
+		cosCache3[i] = -xyNormalRatio * COS(angle);
+	    }
+	}
+    } 
+
+    sinCache[slices] = sinCache[0];
+    cosCache[slices] = cosCache[0];
+    if (needCache2) {
+	sinCache2[slices] = sinCache2[0];
+	cosCache2[slices] = cosCache2[0];
+    }
+    if (needCache3) {
+	sinCache3[slices] = sinCache3[0];
+	cosCache3[slices] = cosCache3[0];
+    }
+
+    switch (qobj->drawStyle) {
+      case GLU_FILL:
+	/* Note:
+	** An argument could be made for using a TRIANGLE_FAN for the end
+	** of the cylinder of either radii is 0.0 (a cone).  However, a 
+	** TRIANGLE_FAN would not work in smooth shading mode (the common 
+	** case) because the normal for the apex is different for every
+	** triangle (and TRIANGLE_FAN doesn't let me respecify that normal).
+	** Now, my choice is GL_TRIANGLES, or leave the GL_QUAD_STRIP and
+	** just let the GL trivially reject one of the two triangles of the
+	** QUAD.  GL_QUAD_STRIP is probably faster, so I will leave this code
+	** alone.
+	*/
+	for (j = 0; j < stacks; j++) {
+	    zLow = j * height / stacks;
+	    zHigh = (j + 1) * height / stacks;
+	    radiusLow = baseRadius - deltaRadius * ((float) j / stacks);
+	    radiusHigh = baseRadius - deltaRadius * ((float) (j + 1) / stacks);
+
+	    glBegin(GL_QUAD_STRIP);
+	    for (i = 0; i <= slices; i++) {
+		switch(qobj->normals) {
+		  case GLU_FLAT:
+		    glNormal3f(sinCache3[i], cosCache3[i], zNormal);
+		    break;
+		  case GLU_SMOOTH:
+		    glNormal3f(sinCache2[i], cosCache2[i], zNormal);
+		    break;
+		  case GLU_NONE:
+		  default:
+		    break;
+		}
+		if (qobj->orientation == GLU_OUTSIDE) {
+		    if (qobj->textureCoords) {
+			glTexCoord2f(1 - (float) i / slices,
+				(float) j / stacks);
+		    }
+		    glVertex3f(radiusLow * sinCache[i], 
+			    radiusLow * cosCache[i], zLow);
+		    if (qobj->textureCoords) {
+			glTexCoord2f(1 - (float) i / slices,
+				(float) (j+1) / stacks);
+		    }
+		    glVertex3f(radiusHigh * sinCache[i], 
+			    radiusHigh * cosCache[i], zHigh);
+		} else {
+		    if (qobj->textureCoords) {
+			glTexCoord2f(1 - (float) i / slices,
+				(float) (j+1) / stacks);
+		    }
+		    glVertex3f(radiusHigh * sinCache[i], 
+			    radiusHigh * cosCache[i], zHigh);
+		    if (qobj->textureCoords) {
+			glTexCoord2f(1 - (float) i / slices,
+				(float) j / stacks);
+		    }
+		    glVertex3f(radiusLow * sinCache[i], 
+			    radiusLow * cosCache[i], zLow);
+		}
+	    }
+	    glEnd();
+	}
+	break;
+      case GLU_POINT:
+	glBegin(GL_POINTS);
+	for (i = 0; i < slices; i++) {
+	    switch(qobj->normals) {
+	      case GLU_FLAT:
+	      case GLU_SMOOTH:
+		glNormal3f(sinCache2[i], cosCache2[i], zNormal);
+		break;
+	      case GLU_NONE:
+	      default:
+		break;
+	    }
+	    sintemp = sinCache[i];
+	    costemp = cosCache[i];
+	    for (j = 0; j <= stacks; j++) {
+		zLow = j * height / stacks;
+		radiusLow = baseRadius - deltaRadius * ((float) j / stacks);
+
+		if (qobj->textureCoords) {
+		    glTexCoord2f(1 - (float) i / slices,
+			    (float) j / stacks);
+		}
+		glVertex3f(radiusLow * sintemp, 
+			radiusLow * costemp, zLow);
+	    }
+	}
+	glEnd();
+	break;
+      case GLU_LINE:
+	for (j = 1; j < stacks; j++) {
+	    zLow = j * height / stacks;
+	    radiusLow = baseRadius - deltaRadius * ((float) j / stacks);
+
+	    glBegin(GL_LINE_STRIP);
+	    for (i = 0; i <= slices; i++) {
+		switch(qobj->normals) {
+		  case GLU_FLAT:
+		    glNormal3f(sinCache3[i], cosCache3[i], zNormal);
+		    break;
+		  case GLU_SMOOTH:
+		    glNormal3f(sinCache2[i], cosCache2[i], zNormal);
+		    break;
+		  case GLU_NONE:
+		  default:
+		    break;
+		}
+		if (qobj->textureCoords) {
+		    glTexCoord2f(1 - (float) i / slices,
+			    (float) j / stacks);
+		}
+		glVertex3f(radiusLow * sinCache[i], 
+			radiusLow * cosCache[i], zLow);
+	    }
+	    glEnd();
+	}
+	/* Intentionally fall through here... */
+      case GLU_SILHOUETTE:
+	for (j = 0; j <= stacks; j += stacks) {
+	    zLow = j * height / stacks;
+	    radiusLow = baseRadius - deltaRadius * ((float) j / stacks);
+
+	    glBegin(GL_LINE_STRIP);
+	    for (i = 0; i <= slices; i++) {
+		switch(qobj->normals) {
+		  case GLU_FLAT:
+		    glNormal3f(sinCache3[i], cosCache3[i], zNormal);
+		    break;
+		  case GLU_SMOOTH:
+		    glNormal3f(sinCache2[i], cosCache2[i], zNormal);
+		    break;
+		  case GLU_NONE:
+		  default:
+		    break;
+		}
+		if (qobj->textureCoords) {
+		    glTexCoord2f(1 - (float) i / slices,
+			    (float) j / stacks);
+		}
+		glVertex3f(radiusLow * sinCache[i], radiusLow * cosCache[i], 
+			zLow);
+	    }
+	    glEnd();
+	}
+	for (i = 0; i < slices; i++) {
+	    switch(qobj->normals) {
+	      case GLU_FLAT:
+	      case GLU_SMOOTH:
+		glNormal3f(sinCache2[i], cosCache2[i], 0.0);
+		break;
+	      case GLU_NONE:
+	      default:
+		break;
+	    }
+	    sintemp = sinCache[i];
+	    costemp = cosCache[i];
+	    glBegin(GL_LINE_STRIP);
+	    for (j = 0; j <= stacks; j++) {
+		zLow = j * height / stacks;
+		radiusLow = baseRadius - deltaRadius * ((float) j / stacks);
+
+		if (qobj->textureCoords) {
+		    glTexCoord2f(1 - (float) i / slices,
+			    (float) j / stacks);
+		}
+		glVertex3f(radiusLow * sintemp, 
+			radiusLow * costemp, zLow);
+	    }
+	    glEnd();
+	}
+	break;
+      default:
+	break;
+    }
+}
+
+void GLAPIENTRY
+gluDisk(GLUquadric *qobj, GLdouble innerRadius, GLdouble outerRadius, 
+	    GLint slices, GLint loops)
+{
+    gluPartialDisk(qobj, innerRadius, outerRadius, slices, loops, 0.0, 360.0);
+}
+
+void GLAPIENTRY
+gluPartialDisk(GLUquadric *qobj, GLdouble innerRadius, 
+		   GLdouble outerRadius, GLint slices, GLint loops,
+		   GLdouble startAngle, GLdouble sweepAngle)
+{
+    GLint i,j,max;
+    GLfloat sinCache[CACHE_SIZE];
+    GLfloat cosCache[CACHE_SIZE];
+    GLfloat angle;
+    GLfloat x, y;
+    GLfloat sintemp, costemp;
+    GLfloat deltaRadius;
+    GLfloat radiusLow, radiusHigh;
+    GLfloat texLow, texHigh;
+    GLfloat angleOffset;
+    GLint slices2;
+    GLint finish;
+
+    if (slices >= CACHE_SIZE) slices = CACHE_SIZE-1;
+    if (slices < 2 || loops < 1 || outerRadius <= 0.0 || innerRadius < 0.0 ||
+	    innerRadius > outerRadius) {
+	gluQuadricError(qobj, GLU_INVALID_VALUE);
+	return;
+    }
+
+    if (sweepAngle < -360.0) sweepAngle = 360.0;
+    if (sweepAngle > 360.0) sweepAngle = 360.0;
+    if (sweepAngle < 0) {
+	startAngle += sweepAngle;
+	sweepAngle = -sweepAngle;
+    }
+
+    if (sweepAngle == 360.0) {
+	slices2 = slices;
+    } else {
+	slices2 = slices + 1;
+    }
+
+    /* Compute length (needed for normal calculations) */
+    deltaRadius = outerRadius - innerRadius;
+
+    /* Cache is the vertex locations cache */
+
+    angleOffset = startAngle / 180.0 * PI;
+    for (i = 0; i <= slices; i++) {
+	angle = angleOffset + ((PI * sweepAngle) / 180.0) * i / slices;
+	sinCache[i] = SIN(angle);
+	cosCache[i] = COS(angle);
+    }
+
+    if (sweepAngle == 360.0) {
+	sinCache[slices] = sinCache[0];
+	cosCache[slices] = cosCache[0];
+    }
+
+    switch(qobj->normals) {
+      case GLU_FLAT:
+      case GLU_SMOOTH:
+	if (qobj->orientation == GLU_OUTSIDE) {
+	    glNormal3f(0.0, 0.0, 1.0);
+	} else {
+	    glNormal3f(0.0, 0.0, -1.0);
+	}
+	break;
+      default:
+      case GLU_NONE:
+	break;
+    }
+
+    switch (qobj->drawStyle) {
+      case GLU_FILL:
+	if (innerRadius == 0.0) {
+	    finish = loops - 1;
+	    /* Triangle strip for inner polygons */
+	    glBegin(GL_TRIANGLE_FAN);
+	    if (qobj->textureCoords) {
+		glTexCoord2f(0.5, 0.5);
+	    }
+	    glVertex3f(0.0, 0.0, 0.0);
+	    radiusLow = outerRadius - 
+		    deltaRadius * ((float) (loops-1) / loops);
+	    if (qobj->textureCoords) {
+		texLow = radiusLow / outerRadius / 2;
+	    }
+
+	    if (qobj->orientation == GLU_OUTSIDE) {
+		for (i = slices; i >= 0; i--) {
+		    if (qobj->textureCoords) {
+			glTexCoord2f(texLow * sinCache[i] + 0.5,
+				texLow * cosCache[i] + 0.5);
+		    }
+		    glVertex3f(radiusLow * sinCache[i], 
+			    radiusLow * cosCache[i], 0.0);
+		}
+	    } else {
+		for (i = 0; i <= slices; i++) {
+		    if (qobj->textureCoords) {
+			glTexCoord2f(texLow * sinCache[i] + 0.5,
+				texLow * cosCache[i] + 0.5);
+		    }
+		    glVertex3f(radiusLow * sinCache[i], 
+			    radiusLow * cosCache[i], 0.0);
+		}
+	    }
+	    glEnd();
+	} else {
+	    finish = loops;
+	}
+	for (j = 0; j < finish; j++) {
+	    radiusLow = outerRadius - deltaRadius * ((float) j / loops);
+	    radiusHigh = outerRadius - deltaRadius * ((float) (j + 1) / loops);
+	    if (qobj->textureCoords) {
+		texLow = radiusLow / outerRadius / 2;
+		texHigh = radiusHigh / outerRadius / 2;
+	    }
+
+	    glBegin(GL_QUAD_STRIP);
+	    for (i = 0; i <= slices; i++) {
+		if (qobj->orientation == GLU_OUTSIDE) {
+		    if (qobj->textureCoords) {
+			glTexCoord2f(texLow * sinCache[i] + 0.5,
+				texLow * cosCache[i] + 0.5);
+		    }
+		    glVertex3f(radiusLow * sinCache[i], 
+			    radiusLow * cosCache[i], 0.0);
+
+		    if (qobj->textureCoords) {
+			glTexCoord2f(texHigh * sinCache[i] + 0.5,
+				texHigh * cosCache[i] + 0.5);
+		    }
+		    glVertex3f(radiusHigh * sinCache[i], 
+			    radiusHigh * cosCache[i], 0.0);
+		} else {
+		    if (qobj->textureCoords) {
+			glTexCoord2f(texHigh * sinCache[i] + 0.5,
+				texHigh * cosCache[i] + 0.5);
+		    }
+		    glVertex3f(radiusHigh * sinCache[i], 
+			    radiusHigh * cosCache[i], 0.0);
+
+		    if (qobj->textureCoords) {
+			glTexCoord2f(texLow * sinCache[i] + 0.5,
+				texLow * cosCache[i] + 0.5);
+		    }
+		    glVertex3f(radiusLow * sinCache[i], 
+			    radiusLow * cosCache[i], 0.0);
+		}
+	    }
+	    glEnd();
+	}
+	break;
+      case GLU_POINT:
+	glBegin(GL_POINTS);
+	for (i = 0; i < slices2; i++) {
+	    sintemp = sinCache[i];
+	    costemp = cosCache[i];
+	    for (j = 0; j <= loops; j++) {
+		radiusLow = outerRadius - deltaRadius * ((float) j / loops);
+
+		if (qobj->textureCoords) {
+		    texLow = radiusLow / outerRadius / 2;
+
+		    glTexCoord2f(texLow * sinCache[i] + 0.5,
+			    texLow * cosCache[i] + 0.5);
+		}
+		glVertex3f(radiusLow * sintemp, radiusLow * costemp, 0.0);
+	    }
+	}
+	glEnd();
+	break;
+      case GLU_LINE:
+	if (innerRadius == outerRadius) {
+	    glBegin(GL_LINE_STRIP);
+
+	    for (i = 0; i <= slices; i++) {
+		if (qobj->textureCoords) {
+		    glTexCoord2f(sinCache[i] / 2 + 0.5,
+			    cosCache[i] / 2 + 0.5);
+		}
+		glVertex3f(innerRadius * sinCache[i],
+			innerRadius * cosCache[i], 0.0);
+	    }
+	    glEnd();
+	    break;
+	}
+	for (j = 0; j <= loops; j++) {
+	    radiusLow = outerRadius - deltaRadius * ((float) j / loops);
+	    if (qobj->textureCoords) {
+		texLow = radiusLow / outerRadius / 2;
+	    }
+
+	    glBegin(GL_LINE_STRIP);
+	    for (i = 0; i <= slices; i++) {
+		if (qobj->textureCoords) {
+		    glTexCoord2f(texLow * sinCache[i] + 0.5,
+			    texLow * cosCache[i] + 0.5);
+		}
+		glVertex3f(radiusLow * sinCache[i], 
+			radiusLow * cosCache[i], 0.0);
+	    }
+	    glEnd();
+	}
+	for (i=0; i < slices2; i++) {
+	    sintemp = sinCache[i];
+	    costemp = cosCache[i];
+	    glBegin(GL_LINE_STRIP);
+	    for (j = 0; j <= loops; j++) {
+		radiusLow = outerRadius - deltaRadius * ((float) j / loops);
+		if (qobj->textureCoords) {
+		    texLow = radiusLow / outerRadius / 2;
+		}
+
+		if (qobj->textureCoords) {
+		    glTexCoord2f(texLow * sinCache[i] + 0.5,
+			    texLow * cosCache[i] + 0.5);
+		}
+		glVertex3f(radiusLow * sintemp, radiusLow * costemp, 0.0);
+	    }
+	    glEnd();
+	}
+	break;
+      case GLU_SILHOUETTE:
+	if (sweepAngle < 360.0) {
+	    for (i = 0; i <= slices; i+= slices) {
+		sintemp = sinCache[i];
+		costemp = cosCache[i];
+		glBegin(GL_LINE_STRIP);
+		for (j = 0; j <= loops; j++) {
+		    radiusLow = outerRadius - deltaRadius * ((float) j / loops);
+
+		    if (qobj->textureCoords) {
+			texLow = radiusLow / outerRadius / 2;
+			glTexCoord2f(texLow * sinCache[i] + 0.5,
+				texLow * cosCache[i] + 0.5);
+		    }
+		    glVertex3f(radiusLow * sintemp, radiusLow * costemp, 0.0);
+		}
+		glEnd();
+	    }
+	}
+	for (j = 0; j <= loops; j += loops) {
+	    radiusLow = outerRadius - deltaRadius * ((float) j / loops);
+	    if (qobj->textureCoords) {
+		texLow = radiusLow / outerRadius / 2;
+	    }
+
+	    glBegin(GL_LINE_STRIP);
+	    for (i = 0; i <= slices; i++) {
+		if (qobj->textureCoords) {
+		    glTexCoord2f(texLow * sinCache[i] + 0.5,
+			    texLow * cosCache[i] + 0.5);
+		}
+		glVertex3f(radiusLow * sinCache[i], 
+			radiusLow * cosCache[i], 0.0);
+	    }
+	    glEnd();
+	    if (innerRadius == outerRadius) break;
+	}
+	break;
+      default:
+	break;
+    }
+}
+
+void GLAPIENTRY
+gluSphere(GLUquadric *qobj, GLdouble radius, GLint slices, GLint stacks)
+{
+    GLint i,j,max;
+    GLfloat sinCache1a[CACHE_SIZE];
+    GLfloat cosCache1a[CACHE_SIZE];
+    GLfloat sinCache2a[CACHE_SIZE];
+    GLfloat cosCache2a[CACHE_SIZE];
+    GLfloat sinCache3a[CACHE_SIZE];
+    GLfloat cosCache3a[CACHE_SIZE];
+    GLfloat sinCache1b[CACHE_SIZE];
+    GLfloat cosCache1b[CACHE_SIZE];
+    GLfloat sinCache2b[CACHE_SIZE];
+    GLfloat cosCache2b[CACHE_SIZE];
+    GLfloat sinCache3b[CACHE_SIZE];
+    GLfloat cosCache3b[CACHE_SIZE];
+    GLfloat angle;
+    GLfloat x, y, zLow, zHigh;
+    GLfloat sintemp1, sintemp2, sintemp3, sintemp4;
+    GLfloat costemp1, costemp2, costemp3, costemp4;
+    GLfloat zNormal;
+    GLfloat xyNormalRatio;
+    GLboolean needCache2, needCache3;
+    GLint start, finish;
+
+    if (slices >= CACHE_SIZE) slices = CACHE_SIZE-1;
+    if (stacks >= CACHE_SIZE) stacks = CACHE_SIZE-1;
+    if (slices < 2 || stacks < 1 || radius < 0.0) {
+	gluQuadricError(qobj, GLU_INVALID_VALUE);
+	return;
+    }
+
+    /* Cache is the vertex locations cache */
+    /* Cache2 is the various normals at the vertices themselves */
+    /* Cache3 is the various normals for the faces */
+    needCache2 = needCache3 = GL_FALSE;
+
+    if (qobj->normals == GLU_SMOOTH) {
+	needCache2 = GL_TRUE;
+    }
+
+    if (qobj->normals == GLU_FLAT) {
+	if (qobj->drawStyle != GLU_POINT) {
+	    needCache3 = GL_TRUE;
+	}
+	if (qobj->drawStyle == GLU_LINE) {
+	    needCache2 = GL_TRUE;
+	}
+    }
+
+    for (i = 0; i < slices; i++) {
+	angle = 2 * PI * i / slices;
+	sinCache1a[i] = SIN(angle);
+	cosCache1a[i] = COS(angle);
+	if (needCache2) {
+	    sinCache2a[i] = sinCache1a[i];
+	    cosCache2a[i] = cosCache1a[i];
+	}
+    }
+
+    for (j = 0; j <= stacks; j++) {
+	angle = PI * j / stacks;
+	if (needCache2) {
+	    if (qobj->orientation == GLU_OUTSIDE) {
+		sinCache2b[j] = SIN(angle);
+		cosCache2b[j] = COS(angle);
+	    } else {
+		sinCache2b[j] = -SIN(angle);
+		cosCache2b[j] = -COS(angle);
+	    }
+	}
+	sinCache1b[j] = radius * SIN(angle);
+	cosCache1b[j] = radius * COS(angle);
+    }
+    /* Make sure it comes to a point */
+    sinCache1b[0] = 0;
+    sinCache1b[stacks] = 0;
+
+    if (needCache3) {
+	for (i = 0; i < slices; i++) {
+	    angle = 2 * PI * (i-0.5) / slices;
+	    sinCache3a[i] = SIN(angle);
+	    cosCache3a[i] = COS(angle);
+	}
+	for (j = 0; j <= stacks; j++) {
+	    angle = PI * (j - 0.5) / stacks;
+	    if (qobj->orientation == GLU_OUTSIDE) {
+		sinCache3b[j] = SIN(angle);
+		cosCache3b[j] = COS(angle);
+	    } else {
+		sinCache3b[j] = -SIN(angle);
+		cosCache3b[j] = -COS(angle);
+	    }
+	}
+    } 
+
+    sinCache1a[slices] = sinCache1a[0];
+    cosCache1a[slices] = cosCache1a[0];
+    if (needCache2) {
+	sinCache2a[slices] = sinCache2a[0];
+	cosCache2a[slices] = cosCache2a[0];
+    }
+    if (needCache3) {
+	sinCache3a[slices] = sinCache3a[0];
+	cosCache3a[slices] = cosCache3a[0];
+    }
+
+    switch (qobj->drawStyle) {
+      case GLU_FILL:
+	/* Do ends of sphere as TRIANGLE_FAN's (if not texturing)
+	** We don't do it when texturing because we need to respecify the
+	** texture coordinates of the apex for every adjacent vertex (because
+	** it isn't a constant for that point)
+	*/
+	if (!(qobj->textureCoords)) {
+	    start = 1;
+	    finish = stacks - 1;
+
+	    /* Low end first (j == 0 iteration) */
+	    sintemp2 = sinCache1b[1];
+	    zHigh = cosCache1b[1];
+	    switch(qobj->normals) {
+	      case GLU_FLAT:
+		sintemp3 = sinCache3b[1];
+		costemp3 = cosCache3b[1];
+		break;
+	      case GLU_SMOOTH:
+		sintemp3 = sinCache2b[1];
+		costemp3 = cosCache2b[1];
+		glNormal3f(sinCache2a[0] * sinCache2b[0],
+			cosCache2a[0] * sinCache2b[0],
+			cosCache2b[0]);
+		break;
+	      default:
+		break;
+	    }
+	    glBegin(GL_TRIANGLE_FAN);
+	    glVertex3f(0.0, 0.0, radius);
+	    if (qobj->orientation == GLU_OUTSIDE) {
+		for (i = slices; i >= 0; i--) {
+		    switch(qobj->normals) {
+		      case GLU_SMOOTH:
+			glNormal3f(sinCache2a[i] * sintemp3,
+				cosCache2a[i] * sintemp3,
+				costemp3);
+			break;
+		      case GLU_FLAT:
+			if (i != slices) {
+			    glNormal3f(sinCache3a[i+1] * sintemp3,
+				    cosCache3a[i+1] * sintemp3,
+				    costemp3);
+			}
+			break;
+		      case GLU_NONE:
+		      default:
+			break;
+		    }
+		    glVertex3f(sintemp2 * sinCache1a[i],
+			    sintemp2 * cosCache1a[i], zHigh);
+		}
+	    } else {
+		for (i = 0; i <= slices; i++) {
+		    switch(qobj->normals) {
+		      case GLU_SMOOTH:
+			glNormal3f(sinCache2a[i] * sintemp3,
+				cosCache2a[i] * sintemp3,
+				costemp3);
+			break;
+		      case GLU_FLAT:
+			glNormal3f(sinCache3a[i] * sintemp3,
+				cosCache3a[i] * sintemp3,
+				costemp3);
+			break;
+		      case GLU_NONE:
+		      default:
+			break;
+		    }
+		    glVertex3f(sintemp2 * sinCache1a[i],
+			    sintemp2 * cosCache1a[i], zHigh);
+		}
+	    }
+	    glEnd();
+
+	    /* High end next (j == stacks-1 iteration) */
+	    sintemp2 = sinCache1b[stacks-1];
+	    zHigh = cosCache1b[stacks-1];
+	    switch(qobj->normals) {
+	      case GLU_FLAT:
+		sintemp3 = sinCache3b[stacks];
+		costemp3 = cosCache3b[stacks];
+		break;
+	      case GLU_SMOOTH:
+		sintemp3 = sinCache2b[stacks-1];
+		costemp3 = cosCache2b[stacks-1];
+		glNormal3f(sinCache2a[stacks] * sinCache2b[stacks],
+			cosCache2a[stacks] * sinCache2b[stacks],
+			cosCache2b[stacks]);
+		break;
+	      default:
+		break;
+	    }
+	    glBegin(GL_TRIANGLE_FAN);
+	    glVertex3f(0.0, 0.0, -radius);
+	    if (qobj->orientation == GLU_OUTSIDE) {
+		for (i = 0; i <= slices; i++) {
+		    switch(qobj->normals) {
+		      case GLU_SMOOTH:
+			glNormal3f(sinCache2a[i] * sintemp3,
+				cosCache2a[i] * sintemp3,
+				costemp3);
+			break;
+		      case GLU_FLAT:
+			glNormal3f(sinCache3a[i] * sintemp3,
+				cosCache3a[i] * sintemp3,
+				costemp3);
+			break;
+		      case GLU_NONE:
+		      default:
+			break;
+		    }
+		    glVertex3f(sintemp2 * sinCache1a[i],
+			    sintemp2 * cosCache1a[i], zHigh);
+		}
+	    } else {
+		for (i = slices; i >= 0; i--) {
+		    switch(qobj->normals) {
+		      case GLU_SMOOTH:
+			glNormal3f(sinCache2a[i] * sintemp3,
+				cosCache2a[i] * sintemp3,
+				costemp3);
+			break;
+		      case GLU_FLAT:
+			if (i != slices) {
+			    glNormal3f(sinCache3a[i+1] * sintemp3,
+				    cosCache3a[i+1] * sintemp3,
+				    costemp3);
+			}
+			break;
+		      case GLU_NONE:
+		      default:
+			break;
+		    }
+		    glVertex3f(sintemp2 * sinCache1a[i],
+			    sintemp2 * cosCache1a[i], zHigh);
+		}
+	    }
+	    glEnd();
+	} else {
+	    start = 0;
+	    finish = stacks;
+	}
+	for (j = start; j < finish; j++) {
+	    zLow = cosCache1b[j];
+	    zHigh = cosCache1b[j+1];
+	    sintemp1 = sinCache1b[j];
+	    sintemp2 = sinCache1b[j+1];
+	    switch(qobj->normals) {
+	      case GLU_FLAT:
+		sintemp4 = sinCache3b[j+1];
+		costemp4 = cosCache3b[j+1];
+		break;
+	      case GLU_SMOOTH:
+		if (qobj->orientation == GLU_OUTSIDE) {
+		    sintemp3 = sinCache2b[j+1];
+		    costemp3 = cosCache2b[j+1];
+		    sintemp4 = sinCache2b[j];
+		    costemp4 = cosCache2b[j];
+		} else {
+		    sintemp3 = sinCache2b[j];
+		    costemp3 = cosCache2b[j];
+		    sintemp4 = sinCache2b[j+1];
+		    costemp4 = cosCache2b[j+1];
+		}
+		break;
+	      default:
+	        break;
+	    }
+
+	    glBegin(GL_QUAD_STRIP);
+	    for (i = 0; i <= slices; i++) {
+		switch(qobj->normals) {
+		  case GLU_SMOOTH:
+		    glNormal3f(sinCache2a[i] * sintemp3,
+			    cosCache2a[i] * sintemp3,
+			    costemp3);
+		    break;
+		  case GLU_FLAT:
+		  case GLU_NONE:
+		  default:
+		    break;
+		}
+		if (qobj->orientation == GLU_OUTSIDE) {
+		    if (qobj->textureCoords) {
+			glTexCoord2f(1 - (float) i / slices,
+				1 - (float) (j+1) / stacks);
+		    }
+		    glVertex3f(sintemp2 * sinCache1a[i],
+			    sintemp2 * cosCache1a[i], zHigh);
+		} else {
+		    if (qobj->textureCoords) {
+			glTexCoord2f(1 - (float) i / slices,
+				1 - (float) j / stacks);
+		    }
+		    glVertex3f(sintemp1 * sinCache1a[i],
+			    sintemp1 * cosCache1a[i], zLow);
+		}
+		switch(qobj->normals) {
+		  case GLU_SMOOTH:
+		    glNormal3f(sinCache2a[i] * sintemp4,
+			    cosCache2a[i] * sintemp4,
+			    costemp4);
+		    break;
+		  case GLU_FLAT:
+		    glNormal3f(sinCache3a[i] * sintemp4,
+			    cosCache3a[i] * sintemp4,
+			    costemp4);
+		    break;
+		  case GLU_NONE:
+		  default:
+		    break;
+		}
+		if (qobj->orientation == GLU_OUTSIDE) {
+		    if (qobj->textureCoords) {
+			glTexCoord2f(1 - (float) i / slices,
+				1 - (float) j / stacks);
+		    }
+		    glVertex3f(sintemp1 * sinCache1a[i],
+			    sintemp1 * cosCache1a[i], zLow);
+		} else {
+		    if (qobj->textureCoords) {
+			glTexCoord2f(1 - (float) i / slices,
+				1 - (float) (j+1) / stacks);
+		    }
+		    glVertex3f(sintemp2 * sinCache1a[i],
+			    sintemp2 * cosCache1a[i], zHigh);
+		}
+	    }
+	    glEnd();
+	}
+	break;
+      case GLU_POINT:
+	glBegin(GL_POINTS);
+	for (j = 0; j <= stacks; j++) {
+	    sintemp1 = sinCache1b[j];
+	    costemp1 = cosCache1b[j];
+	    switch(qobj->normals) {
+	      case GLU_FLAT:
+	      case GLU_SMOOTH:
+		sintemp2 = sinCache2b[j];
+		costemp2 = cosCache2b[j];
+		break;
+	      default:
+	        break;
+	    }
+	    for (i = 0; i < slices; i++) {
+		switch(qobj->normals) {
+		  case GLU_FLAT:
+		  case GLU_SMOOTH:
+		    glNormal3f(sinCache2a[i] * sintemp2,
+			    cosCache2a[i] * sintemp2,
+			    costemp2);
+		    break;
+		  case GLU_NONE:
+		  default:
+		    break;
+		}
+
+		zLow = j * radius / stacks;
+
+		if (qobj->textureCoords) {
+		    glTexCoord2f(1 - (float) i / slices,
+			    1 - (float) j / stacks);
+		}
+		glVertex3f(sintemp1 * sinCache1a[i], 
+			sintemp1 * cosCache1a[i], costemp1);
+	    }
+	}
+	glEnd();
+	break;
+      case GLU_LINE:
+      case GLU_SILHOUETTE:
+	for (j = 1; j < stacks; j++) {
+	    sintemp1 = sinCache1b[j];
+	    costemp1 = cosCache1b[j];
+	    switch(qobj->normals) {
+	      case GLU_FLAT:
+	      case GLU_SMOOTH:
+		sintemp2 = sinCache2b[j];
+		costemp2 = cosCache2b[j];
+		break;
+	      default:
+		break;
+	    }
+
+	    glBegin(GL_LINE_STRIP);
+	    for (i = 0; i <= slices; i++) {
+		switch(qobj->normals) {
+		  case GLU_FLAT:
+		    glNormal3f(sinCache3a[i] * sintemp2,
+			    cosCache3a[i] * sintemp2,
+			    costemp2);
+		    break;
+		  case GLU_SMOOTH:
+		    glNormal3f(sinCache2a[i] * sintemp2,
+			    cosCache2a[i] * sintemp2,
+			    costemp2);
+		    break;
+		  case GLU_NONE:
+		  default:
+		    break;
+		}
+		if (qobj->textureCoords) {
+		    glTexCoord2f(1 - (float) i / slices,
+			    1 - (float) j / stacks);
+		}
+		glVertex3f(sintemp1 * sinCache1a[i], 
+			sintemp1 * cosCache1a[i], costemp1);
+	    }
+	    glEnd();
+	}
+	for (i = 0; i < slices; i++) {
+	    sintemp1 = sinCache1a[i];
+	    costemp1 = cosCache1a[i];
+	    switch(qobj->normals) {
+	      case GLU_FLAT:
+	      case GLU_SMOOTH:
+		sintemp2 = sinCache2a[i];
+		costemp2 = cosCache2a[i];
+		break;
+	      default:
+		break;
+	    }
+
+	    glBegin(GL_LINE_STRIP);
+	    for (j = 0; j <= stacks; j++) {
+		switch(qobj->normals) {
+		  case GLU_FLAT:
+		    glNormal3f(sintemp2 * sinCache3b[j],
+			    costemp2 * sinCache3b[j],
+			    cosCache3b[j]);
+		    break;
+		  case GLU_SMOOTH:
+		    glNormal3f(sintemp2 * sinCache2b[j],
+			    costemp2 * sinCache2b[j],
+			    cosCache2b[j]);
+		    break;
+		  case GLU_NONE:
+		  default:
+		    break;
+		}
+
+		if (qobj->textureCoords) {
+		    glTexCoord2f(1 - (float) i / slices,
+			    1 - (float) j / stacks);
+		}
+		glVertex3f(sintemp1 * sinCache1b[j], 
+			costemp1 * sinCache1b[j], cosCache1b[j]);
+	    }
+	    glEnd();
+	}
+	break;
+      default:
+	break;
+    }
+}