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Amiga Format CD 52
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Amiga Format AFCD52 (Issue 136, May 2000).iso
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mesa
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mesa-tk
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samples.tk
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nurb.c
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2000-02-23
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351 lines
/*
* Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that (i) the above copyright notices and this permission notice appear in
* all copies of the software and related documentation, and (ii) the name of
* Silicon Graphics may not be used in any advertising or
* publicity relating to the software without the specific, prior written
* permission of Silicon Graphics.
*
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
* ANY KIND,
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <math.h>
#include <GL/gltk.h>
#define INREAL float
#define S_NUMPOINTS 13
#define S_ORDER 3
#define S_NUMKNOTS (S_NUMPOINTS + S_ORDER)
#define T_NUMPOINTS 3
#define T_ORDER 3
#define T_NUMKNOTS (T_NUMPOINTS + T_ORDER)
#define SQRT_TWO 1.41421356237309504880
typedef INREAL Point[4];
GLenum doubleBuffer, directRender;
GLenum expectedError;
GLint rotX = 40, rotY = 40;
INREAL sknots[S_NUMKNOTS] =
{
-1.0, -1.0, -1.0, 0.0, 1.0, 2.0, 3.0, 4.0,
4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 9.0, 9.0
};
INREAL tknots[T_NUMKNOTS] =
{
1.0, 1.0, 1.0, 2.0, 2.0, 2.0
};
Point ctlpoints[S_NUMPOINTS][T_NUMPOINTS] =
{
{
{
4.0, 2.0, 2.0, 1.0
},
{
4.0, 1.6, 2.5, 1.0
},
{
4.0, 2.0, 3.0, 1.0
}
},
{
{
5.0, 4.0, 2.0, 1.0
},
{
5.0, 4.0, 2.5, 1.0
},
{
5.0, 4.0, 3.0, 1.0
}
},
{
{
6.0, 5.0, 2.0, 1.0
},
{
6.0, 5.0, 2.5, 1.0
},
{
6.0, 5.0, 3.0, 1.0
}
},
{
{
SQRT_TWO * 6.0, SQRT_TWO * 6.0, SQRT_TWO * 2.0, SQRT_TWO
},
{
SQRT_TWO * 6.0, SQRT_TWO * 6.0, SQRT_TWO * 2.5, SQRT_TWO
},
{
SQRT_TWO * 6.0, SQRT_TWO * 6.0, SQRT_TWO * 3.0, SQRT_TWO
}
},
{
{
5.2, 6.7, 2.0, 1.0
},
{
5.2, 6.7, 2.5, 1.0
},
{
5.2, 6.7, 3.0, 1.0
}
},
{
{
SQRT_TWO * 4.0, SQRT_TWO * 6.0, SQRT_TWO * 2.0, SQRT_TWO
},
{
SQRT_TWO * 4.0, SQRT_TWO * 6.0, SQRT_TWO * 2.5, SQRT_TWO
},
{
SQRT_TWO * 4.0, SQRT_TWO * 6.0, SQRT_TWO * 3.0, SQRT_TWO
}
},
{
{
4.0, 5.2, 2.0, 1.0
},
{
4.0, 4.6, 2.5, 1.0
},
{
4.0, 5.2, 3.0, 1.0
}
},
{
{
SQRT_TWO * 4.0, SQRT_TWO * 6.0, SQRT_TWO * 2.0, SQRT_TWO
},
{
SQRT_TWO * 4.0, SQRT_TWO * 6.0, SQRT_TWO * 2.5, SQRT_TWO
},
{
SQRT_TWO * 4.0, SQRT_TWO * 6.0, SQRT_TWO * 3.0, SQRT_TWO
}
},
{
{
2.8, 6.7, 2.0, 1.0
},
{
2.8, 6.7, 2.5, 1.0
},
{
2.8, 6.7, 3.0, 1.0
}
},
{
{
SQRT_TWO * 2.0, SQRT_TWO * 6.0, SQRT_TWO * 2.0, SQRT_TWO
},
{
SQRT_TWO * 2.0, SQRT_TWO * 6.0, SQRT_TWO * 2.5, SQRT_TWO
},
{
SQRT_TWO * 2.0, SQRT_TWO * 6.0, SQRT_TWO * 3.0, SQRT_TWO
}
},
{
{
2.0, 5.0, 2.0, 1.0
},
{
2.0, 5.0, 2.5, 1.0
},
{
2.0, 5.0, 3.0, 1.0
}
},
{
{
3.0, 4.0, 2.0, 1.0
},
{
3.0, 4.0, 2.5, 1.0
},
{
3.0, 4.0, 3.0, 1.0
}
},
{
{
4.0, 2.0, 2.0, 1.0
},
{
4.0, 1.6, 2.5, 1.0
},
{
4.0, 2.0, 3.0, 1.0
}
}
};
GLUnurbsObj *theNurbs;
static void ErrorCallback(GLenum which)
{
if (which != expectedError) {
fprintf(stderr, "Unexpected error occured (%d):\n", which);
fprintf(stderr, " %s\n", gluErrorString(which));
}
}
static void Init(void)
{
theNurbs = gluNewNurbsRenderer();
gluNurbsCallback(theNurbs, GLU_ERROR, ErrorCallback);
gluNurbsProperty(theNurbs, GLU_SAMPLING_TOLERANCE, 15.0);
gluNurbsProperty(theNurbs, GLU_DISPLAY_MODE, GLU_OUTLINE_PATCH);
expectedError = GLU_INVALID_ENUM;
gluNurbsProperty(theNurbs, ~0, 15.0);
expectedError = GLU_NURBS_ERROR13;
gluEndSurface(theNurbs);
expectedError = 0;
glColor3f(1.0, 1.0, 1.0);
}
static void Reshape(int width, int height)
{
glViewport(0, 0, (GLint) width, (GLint) height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-2.0, 2.0, -2.0, 2.0, 0.8, 10.0);
gluLookAt(7.0, 4.5, 4.0, 4.5, 4.5, 2.5, 6.0, -3.0, 2.0);
glMatrixMode(GL_MODELVIEW);
}
static GLenum Key(int key, GLenum mask)
{
switch (key) {
case TK_ESCAPE:
tkQuit();
case TK_DOWN:
rotX -= 5;
break;
case TK_UP:
rotX += 5;
break;
case TK_LEFT:
rotY -= 5;
break;
case TK_RIGHT:
rotY += 5;
break;
default:
return GL_FALSE;
}
return GL_TRUE;
}
static void Draw(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glPushMatrix();
glTranslatef(4.0, 4.5, 2.5);
glRotatef(rotY, 1, 0, 0);
glRotatef(rotX, 0, 1, 0);
glTranslatef(-4.0, -4.5, -2.5);
gluBeginSurface(theNurbs);
gluNurbsSurface(theNurbs, S_NUMKNOTS, sknots, T_NUMKNOTS, tknots,
4 * T_NUMPOINTS, 4, &ctlpoints[0][0][0], S_ORDER,
T_ORDER, GL_MAP2_VERTEX_4);
gluEndSurface(theNurbs);
glPopMatrix();
glFlush();
if (doubleBuffer) {
tkSwapBuffers();
}
}
static GLenum Args(int argc, char **argv)
{
GLint i;
doubleBuffer = GL_FALSE;
directRender = GL_TRUE;
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-sb") == 0) {
doubleBuffer = GL_FALSE;
}
else if (strcmp(argv[i], "-db") == 0) {
doubleBuffer = GL_TRUE;
}
else if (strcmp(argv[i], "-dr") == 0) {
directRender = GL_TRUE;
}
else if (strcmp(argv[i], "-ir") == 0) {
directRender = GL_FALSE;
}
else {
printf("%s (Bad option).\n", argv[i]);
return GL_FALSE;
}
}
return GL_TRUE;
}
void main(int argc, char **argv)
{
GLenum type;
if (Args(argc, argv) == GL_FALSE) {
tkQuit();
}
tkInitPosition(0, 0, 300, 300);
type = TK_RGB;
type |= (doubleBuffer) ? TK_DOUBLE : TK_SINGLE;
type |= (directRender) ? TK_DIRECT : TK_INDIRECT;
tkInitDisplayMode(type);
if (tkInitWindow("NURBS Test") == GL_FALSE) {
tkQuit();
}
Init();
tkExposeFunc(Reshape);
tkReshapeFunc(Reshape);
tkKeyDownFunc(Key);
tkDisplayFunc(Draw);
tkExec();
}