/*
* TODO BEFORE THE STABLE RELEASE:
*
+ * See fghTetrahedron
+ *
* Following functions have been contributed by Andreas Umbach.
*
* glutWireCube() -- looks OK
*/
-/* -- INTERFACE FUNCTIONS -------------------------------------------------- */
-
-/*
- * Draws a wireframed cube. Code contributed by Andreas Umbach <marvin@dataway.ch>
+/* General function for drawing geometry. As for all geometry we have no
+ * redundancy (or hardly any in the case of cones and cylinders) in terms
+ * of the vertex/normal combinations, we just use glDrawArrays.
+ * useWireMode controls the drawing of solids (false) or wire frame
+ * versions (TRUE) of the geometry you pass
*/
-void FGAPIENTRY glutWireCube( GLdouble dSize )
+static void fghDrawGeometry(GLenum vertexMode, GLdouble* vertices, GLdouble* normals, GLsizei numVertices, GLboolean useWireMode)
{
- double size = dSize * 0.5;
+ if (useWireMode)
+ {
+ glPushAttrib(GL_POLYGON_BIT);
+ glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+ }
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCube" );
+ if (1)
+ {
+ glEnableClientState(GL_VERTEX_ARRAY);
+ glEnableClientState(GL_NORMAL_ARRAY);
-# define V(a,b,c) glVertex3d( a size, b size, c size );
-# define N(a,b,c) glNormal3d( a, b, c );
+ glVertexPointer(3, GL_DOUBLE, 0, vertices);
+ glNormalPointer(GL_DOUBLE, 0, normals);
+ glDrawArrays(vertexMode, 0, numVertices);
- /* PWO: I dared to convert the code to use macros... */
- glBegin( GL_LINE_LOOP ); N( 1.0, 0.0, 0.0); V(+,-,+); V(+,-,-); V(+,+,-); V(+,+,+); glEnd();
- glBegin( GL_LINE_LOOP ); N( 0.0, 1.0, 0.0); V(+,+,+); V(+,+,-); V(-,+,-); V(-,+,+); glEnd();
- glBegin( GL_LINE_LOOP ); N( 0.0, 0.0, 1.0); V(+,+,+); V(-,+,+); V(-,-,+); V(+,-,+); glEnd();
- glBegin( GL_LINE_LOOP ); N(-1.0, 0.0, 0.0); V(-,-,+); V(-,+,+); V(-,+,-); V(-,-,-); glEnd();
- glBegin( GL_LINE_LOOP ); N( 0.0,-1.0, 0.0); V(-,-,+); V(-,-,-); V(+,-,-); V(+,-,+); glEnd();
- glBegin( GL_LINE_LOOP ); N( 0.0, 0.0,-1.0); V(-,-,-); V(-,+,-); V(+,+,-); V(+,-,-); glEnd();
+ glDisableClientState(GL_VERTEX_ARRAY);
+ glDisableClientState(GL_NORMAL_ARRAY);
+ }
+ else
+ {
+ int i;
+ glBegin(vertexMode);
+ for(i=0; i<numVertices; i++)
+ {
+ glNormal3dv(normals+i*3);
+ printf("n(%i) = (%1.4f,%1.4f,%1.4f)\n",i,*(normals+i*3),*(normals+i*3+1),*(normals+i*3+2));
+ glVertex3dv(vertices+i*3);
+ printf("v(%i) = (%1.4f,%1.4f,%1.4f)\n",i,*(vertices+i*3),*(vertices+i*3+1),*(vertices+i*3+2));
+ }
+ glEnd();
+ }
-# undef V
-# undef N
+ if (useWireMode)
+ {
+ glPopAttrib();
+ }
}
+static void fghGenerateGeometry(int numFaces, int numVertPerFace, GLdouble *vertices, GLubyte* vertIndices, GLdouble *normals, GLdouble *vertOut, GLdouble *normOut)
+{
+ int i,j;
+ /*
+ * Build array with vertices from vertex coordinates and vertex indices
+ * Do same for normals.
+ * Need to do this because of different normals at shared vertices
+ * (and because normals' coordinates need to be negated).
+ */
+ for (i=0; i<numFaces; i++)
+ {
+ int normIdx = i*3;
+ int faceIdxVertIdx = i*numVertPerFace;
+ for (j=0; j<numVertPerFace; j++)
+ {
+ int outIdx = i*numVertPerFace*3+j*3;
+ int vertIdx = vertIndices[faceIdxVertIdx+j]*3;
+
+ vertOut[outIdx ] = vertices[vertIdx ];
+ vertOut[outIdx+1] = vertices[vertIdx+1];
+ vertOut[outIdx+2] = vertices[vertIdx+2];
+
+ normOut[outIdx ] = normals [normIdx ];
+ normOut[outIdx+1] = normals [normIdx+1];
+ normOut[outIdx+2] = normals [normIdx+2];
+ }
+ }
+}
+
+
+/* -- INTERNAL SETUP OF GEOMETRY --------------------------------------- */
+static unsigned int ipow (int x, unsigned int y)
+{
+ return y==0? 1: y==1? x: (y%2? x: 1) * ipow(x*x, y/2);
+}
+
+/* -- stuff that can be cached -- */
+/* Cache of input to glDrawArrays */
+#define DECLARE_SHAPE_CACHE(name,nameICaps,nameCaps)\
+ static GLboolean name##Cached = FALSE;\
+ static GLdouble name##_verts[nameCaps##_VERT_ELEM_PER_OBJ];\
+ static GLdouble name##_norms[nameCaps##_VERT_ELEM_PER_OBJ];\
+ static void fgh##nameICaps##Generate()\
+ {\
+ fghGenerateGeometry(nameCaps##_NUM_FACES, nameCaps##_NUM_VERT_PER_FACE,\
+ name##_v, name##_vi, name##_n,\
+ name##_verts, name##_norms);\
+ }
/*
- * Draws a solid cube. Code contributed by Andreas Umbach <marvin@dataway.ch>
+ * In general, we build arrays with all vertices or normals.
+ * We cant compress this and use glDrawElements as all combinations of
+ * vertex and normals are unique.
*/
-void FGAPIENTRY glutSolidCube( GLdouble dSize )
+
+/* -- Cube -- */
+#define CUBE_NUM_VERT 8
+#define CUBE_NUM_FACES 6
+#define CUBE_NUM_VERT_PER_FACE 4
+#define CUBE_VERT_PER_OBJ CUBE_NUM_FACES*CUBE_NUM_VERT_PER_FACE
+#define CUBE_VERT_ELEM_PER_OBJ CUBE_VERT_PER_OBJ*3
+/* Vertex Coordinates */
+static GLdouble cube_v[CUBE_NUM_VERT*3] =
+{
+ .5, .5, .5,
+ -.5, .5, .5,
+ -.5,-.5, .5,
+ .5,-.5, .5,
+ .5,-.5,-.5,
+ .5, .5,-.5,
+ -.5, .5,-.5,
+ -.5,-.5,-.5
+};
+/* Normal Vectors */
+static GLdouble cube_n[CUBE_NUM_FACES*3] =
+{
+ 0.0, 0.0, 1.0,
+ 1.0, 0.0, 0.0,
+ 0.0, 1.0, 0.0,
+ -1.0, 0.0, 0.0,
+ 0.0,-1.0, 0.0,
+ 0.0, 0.0,-1.0
+};
+
+/* Vertex indices */
+static GLubyte cube_vi[CUBE_VERT_PER_OBJ] =
{
- double size = dSize * 0.5;
+ 0,1,2,3,
+ 0,3,4,5,
+ 0,5,6,1,
+ 1,6,7,2,
+ 7,4,3,2,
+ 4,7,6,5
+};
+DECLARE_SHAPE_CACHE(cube,Cube,CUBE);
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCube" );
+/* -- Octahedron -- */
+#define OCTAHEDRON_NUM_VERT 6
+#define OCTAHEDRON_NUM_FACES 8
+#define OCTAHEDRON_NUM_VERT_PER_FACE 3
+#define OCTAHEDRON_VERT_PER_OBJ OCTAHEDRON_NUM_FACES*OCTAHEDRON_NUM_VERT_PER_FACE
+#define OCTAHEDRON_VERT_ELEM_PER_OBJ OCTAHEDRON_VERT_PER_OBJ*3
-# define V(a,b,c) glVertex3d( a size, b size, c size );
-# define N(a,b,c) glNormal3d( a, b, c );
+/* Vertex Coordinates */
+static GLdouble octahedron_v[OCTAHEDRON_NUM_VERT*3] =
+{
+ 1., 0., 0.,
+ 0., 1., 0.,
+ 0., 0., 1.,
+ -1., 0., 0.,
+ 0., -1., 0.,
+ 0., 0., -1.,
- /* PWO: Again, I dared to convert the code to use macros... */
- glBegin( GL_QUADS );
- N( 1.0, 0.0, 0.0); V(+,-,+); V(+,-,-); V(+,+,-); V(+,+,+);
- N( 0.0, 1.0, 0.0); V(+,+,+); V(+,+,-); V(-,+,-); V(-,+,+);
- N( 0.0, 0.0, 1.0); V(+,+,+); V(-,+,+); V(-,-,+); V(+,-,+);
- N(-1.0, 0.0, 0.0); V(-,-,+); V(-,+,+); V(-,+,-); V(-,-,-);
- N( 0.0,-1.0, 0.0); V(-,-,+); V(-,-,-); V(+,-,-); V(+,-,+);
- N( 0.0, 0.0,-1.0); V(-,-,-); V(-,+,-); V(+,+,-); V(+,-,-);
- glEnd();
+};
+/* Normal Vectors */
+static GLdouble octahedron_n[OCTAHEDRON_NUM_FACES*3] =
+{
+ 0.577350269189, 0.577350269189, 0.577350269189, /* sqrt(1/3) */
+ 0.577350269189, 0.577350269189,-0.577350269189,
+ 0.577350269189,-0.577350269189, 0.577350269189,
+ 0.577350269189,-0.577350269189,-0.577350269189,
+ -0.577350269189, 0.577350269189, 0.577350269189,
+ -0.577350269189, 0.577350269189,-0.577350269189,
+ -0.577350269189,-0.577350269189, 0.577350269189,
+ -0.577350269189,-0.577350269189,-0.577350269189
+
+};
+
+/* Vertex indices */
+static GLubyte octahedron_vi[OCTAHEDRON_VERT_PER_OBJ] =
+{
+ 0, 1, 2,
+ 0, 5, 1,
+ 0, 2, 4,
+ 0, 4, 5,
+ 3, 2, 1,
+ 3, 1, 5,
+ 3, 4, 2,
+ 3, 5, 4
+};
+DECLARE_SHAPE_CACHE(octahedron,Octahedron,OCTAHEDRON);
-# undef V
-# undef N
+/* -- Tetrahedron -- */
+/* Magic Numbers: r0 = ( 1, 0, 0 )
+ * r1 = ( -1/3, 2 sqrt(2) / 3, 0 )
+ * r2 = ( -1/3, - sqrt(2) / 3, sqrt(6) / 3 )
+ * r3 = ( -1/3, - sqrt(2) / 3, -sqrt(6) / 3 )
+ * |r0| = |r1| = |r2| = |r3| = 1
+ * Distance between any two points is 2 sqrt(6) / 3
+ *
+ * Normals: The unit normals are simply the negative of the coordinates of the point not on the surface.
+ */
+#define TETRAHEDRON_NUM_VERT 4
+#define TETRAHEDRON_NUM_FACES 4
+#define TETRAHEDRON_NUM_VERT_PER_FACE 3
+#define TETRAHEDRON_VERT_PER_OBJ TETRAHEDRON_NUM_FACES*TETRAHEDRON_NUM_VERT_PER_FACE
+#define TETRAHEDRON_VERT_ELEM_PER_OBJ TETRAHEDRON_VERT_PER_OBJ*3
+
+/* Vertex Coordinates */
+static GLdouble tetrahedron_v[TETRAHEDRON_NUM_VERT*3] =
+{
+ 1.0, 0.0, 0.0,
+ -0.333333333333, 0.942809041582, 0.0,
+ -0.333333333333, -0.471404520791, 0.816496580928,
+ -0.333333333333, -0.471404520791, -0.816496580928
+};
+/* Normal Vectors */
+static GLdouble tetrahedron_n[TETRAHEDRON_NUM_FACES*3] =
+{
+ - 1.0, 0.0, 0.0,
+ 0.333333333333, -0.942809041582, 0.0,
+ 0.333333333333, 0.471404520791, -0.816496580928,
+ 0.333333333333, 0.471404520791, 0.816496580928
+};
+
+/* Vertex indices */
+static GLubyte tetrahedron_vi[TETRAHEDRON_VERT_PER_OBJ] =
+{
+ 1, 3, 2,
+ 0, 2, 3,
+ 0, 3, 1,
+ 0, 1, 2
+};
+DECLARE_SHAPE_CACHE(tetrahedron,Tetrahedron,TETRAHEDRON);
+
+/* -- Sierpinski Sponge -- */
+static void fghSierpinskiSpongeGenerate ( int numLevels, GLdouble offset[3], GLdouble scale, GLdouble* vertices, GLdouble* normals )
+{
+ int i, j;
+ if ( numLevels == 0 )
+ {
+ for (i=0; i<TETRAHEDRON_NUM_FACES; i++)
+ {
+ int normIdx = i*3;
+ int faceIdxVertIdx = i*TETRAHEDRON_NUM_VERT_PER_FACE;
+ for (j=0; j<TETRAHEDRON_NUM_VERT_PER_FACE; j++)
+ {
+ int outIdx = i*TETRAHEDRON_NUM_VERT_PER_FACE*3+j*3;
+ int vertIdx = tetrahedron_vi[faceIdxVertIdx+j]*3;
+
+ vertices[outIdx ] = offset[0] + scale * tetrahedron_v[vertIdx ];
+ vertices[outIdx+1] = offset[1] + scale * tetrahedron_v[vertIdx+1];
+ vertices[outIdx+2] = offset[2] + scale * tetrahedron_v[vertIdx+2];
+
+ normals [outIdx ] = tetrahedron_n[normIdx ];
+ normals [outIdx+1] = tetrahedron_n[normIdx+1];
+ normals [outIdx+2] = tetrahedron_n[normIdx+2];
+ }
+ }
+ }
+ else if ( numLevels > 0 )
+ {
+ GLdouble local_offset[3] ; /* Use a local variable to avoid buildup of roundoff errors */
+ unsigned int stride = ipow(4,--numLevels)*TETRAHEDRON_VERT_ELEM_PER_OBJ;
+ scale /= 2.0 ;
+ for ( i = 0 ; i < TETRAHEDRON_NUM_FACES ; i++ )
+ {
+ int idx = i*3;
+ local_offset[0] = offset[0] + scale * tetrahedron_v[idx ];
+ local_offset[1] = offset[1] + scale * tetrahedron_v[idx+1];
+ local_offset[2] = offset[2] + scale * tetrahedron_v[idx+2];
+ fghSierpinskiSpongeGenerate ( numLevels, local_offset, scale, vertices+i*stride, normals+i*stride );
+ }
+ }
}
+/* -- Now the various shapes involving circles -- */
/*
* Compute lookup table of cos and sin values forming a cirle
*
* The last entry is exactly the same as the first
* The sign of n can be flipped to get the reverse loop
*/
-
static void fghCircleTable(double **sint,double **cost,const int n)
{
int i;
(*cost)[size] = (*cost)[0];
}
+
+/* -- INTERNAL DRAWING functions to avoid code duplication ------------- */
+#define DECLARE_INTERNAL_DRAW(name,nameICaps,nameCaps)\
+ static void fgh##nameICaps( GLboolean useWireMode )\
+ {\
+ if (!name##Cached)\
+ {\
+ fgh##nameICaps##Generate();\
+ name##Cached = TRUE;\
+ }\
+ fghDrawGeometry(GL_TRIANGLES,name##_verts,name##_norms,nameCaps##_VERT_PER_OBJ,useWireMode);\
+ }
+
+static void fghCube( GLdouble dSize, GLboolean useWireMode )
+{
+ if (!cubeCached)
+ {
+ fghCubeGenerate();
+ cubeCached = TRUE;
+ }
+
+ if (dSize!=1.)
+ {
+ int i;
+
+ /* Need to build new vertex list containing vertices for cube of different size */
+ GLdouble *vertices = malloc(CUBE_VERT_ELEM_PER_OBJ * sizeof(GLdouble));
+ for (i=0; i<CUBE_VERT_ELEM_PER_OBJ; i++)
+ vertices[i] = dSize*cube_verts[i];
+
+ fghDrawGeometry(GL_QUADS,vertices ,cube_norms,CUBE_VERT_PER_OBJ,useWireMode);
+ }
+ else
+ fghDrawGeometry(GL_QUADS,cube_verts,cube_norms,CUBE_VERT_PER_OBJ,useWireMode);
+}
+DECLARE_INTERNAL_DRAW(octahedron,Octahedron,OCTAHEDRON);
+DECLARE_INTERNAL_DRAW(tetrahedron,Tetrahedron,TETRAHEDRON);
+
+static void fghSierpinskiSponge ( int numLevels, GLdouble offset[3], GLdouble scale, GLboolean useWireMode )
+{
+ GLdouble *vertices;
+ GLdouble * normals;
+ GLsizei numTetr = numLevels<0? 0 : ipow(4,numLevels); /* No sponge for numLevels below 0 */
+ GLsizei numVert = numTetr*TETRAHEDRON_VERT_PER_OBJ;
+
+ if (numTetr)
+ {
+ /* Allocate memory */
+ vertices = malloc(numVert*3 * sizeof(GLdouble));
+ normals = malloc(numVert*3 * sizeof(GLdouble));
+
+ /* Generate elements */
+ fghSierpinskiSpongeGenerate ( numLevels, offset, scale, vertices, normals );
+
+ /* Draw and cleanup */
+ fghDrawGeometry(GL_TRIANGLES,vertices,normals,numVert,useWireMode);
+ free(vertices);
+ free(normals );
+ }
+}
+
+
+/* -- INTERFACE FUNCTIONS ---------------------------------------------- */
+
+
/*
* Draws a solid sphere
*/
/*
*
*/
-void FGAPIENTRY glutWireOctahedron( void )
-{
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireOctahedron" );
-
-#define RADIUS 1.0f
- glBegin( GL_LINE_LOOP );
- glNormal3d( 0.577350269189, 0.577350269189, 0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, RADIUS, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS );
- glNormal3d( 0.577350269189, 0.577350269189,-0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS ); glVertex3d( 0.0, RADIUS, 0.0 );
- glNormal3d( 0.577350269189,-0.577350269189, 0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS ); glVertex3d( 0.0,-RADIUS, 0.0 );
- glNormal3d( 0.577350269189,-0.577350269189,-0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0,-RADIUS, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS );
- glNormal3d(-0.577350269189, 0.577350269189, 0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS ); glVertex3d( 0.0, RADIUS, 0.0 );
- glNormal3d(-0.577350269189, 0.577350269189,-0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, RADIUS, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS );
- glNormal3d(-0.577350269189,-0.577350269189, 0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0,-RADIUS, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS );
- glNormal3d(-0.577350269189,-0.577350269189,-0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS ); glVertex3d( 0.0,-RADIUS, 0.0 );
- glEnd();
-#undef RADIUS
-}
-
-/*
- *
- */
-void FGAPIENTRY glutSolidOctahedron( void )
-{
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidOctahedron" );
-
-#define RADIUS 1.0f
- glBegin( GL_TRIANGLES );
- glNormal3d( 0.577350269189, 0.577350269189, 0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, RADIUS, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS );
- glNormal3d( 0.577350269189, 0.577350269189,-0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS ); glVertex3d( 0.0, RADIUS, 0.0 );
- glNormal3d( 0.577350269189,-0.577350269189, 0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS ); glVertex3d( 0.0,-RADIUS, 0.0 );
- glNormal3d( 0.577350269189,-0.577350269189,-0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0,-RADIUS, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS );
- glNormal3d(-0.577350269189, 0.577350269189, 0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS ); glVertex3d( 0.0, RADIUS, 0.0 );
- glNormal3d(-0.577350269189, 0.577350269189,-0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, RADIUS, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS );
- glNormal3d(-0.577350269189,-0.577350269189, 0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0,-RADIUS, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS );
- glNormal3d(-0.577350269189,-0.577350269189,-0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS ); glVertex3d( 0.0,-RADIUS, 0.0 );
- glEnd();
-#undef RADIUS
-}
-
-/* Magic Numbers: r0 = ( 1, 0, 0 )
- * r1 = ( -1/3, 2 sqrt(2) / 3, 0 )
- * r2 = ( -1/3, -sqrt(2) / 3, sqrt(6) / 3 )
- * r3 = ( -1/3, -sqrt(2) / 3, -sqrt(6) / 3 )
- * |r0| = |r1| = |r2| = |r3| = 1
- * Distance between any two points is 2 sqrt(6) / 3
- *
- * Normals: The unit normals are simply the negative of the coordinates of the point not on the surface.
- */
-
-#define NUM_TETR_FACES 4
-
-static GLdouble tet_r[4][3] = { { 1.0, 0.0, 0.0 },
- { -0.333333333333, 0.942809041582, 0.0 },
- { -0.333333333333, -0.471404520791, 0.816496580928 },
- { -0.333333333333, -0.471404520791, -0.816496580928 } } ;
-
-static GLint tet_i[4][3] = /* Vertex indices */
-{
- { 1, 3, 2 }, { 0, 2, 3 }, { 0, 3, 1 }, { 0, 1, 2 }
-} ;
-
-/*
- *
- */
-void FGAPIENTRY glutWireTetrahedron( void )
-{
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireTetrahedron" );
-
- glBegin( GL_LINE_LOOP ) ;
- glNormal3d ( -tet_r[0][0], -tet_r[0][1], -tet_r[0][2] ) ; glVertex3dv ( tet_r[1] ) ; glVertex3dv ( tet_r[3] ) ; glVertex3dv ( tet_r[2] ) ;
- glNormal3d ( -tet_r[1][0], -tet_r[1][1], -tet_r[1][2] ) ; glVertex3dv ( tet_r[0] ) ; glVertex3dv ( tet_r[2] ) ; glVertex3dv ( tet_r[3] ) ;
- glNormal3d ( -tet_r[2][0], -tet_r[2][1], -tet_r[2][2] ) ; glVertex3dv ( tet_r[0] ) ; glVertex3dv ( tet_r[3] ) ; glVertex3dv ( tet_r[1] ) ;
- glNormal3d ( -tet_r[3][0], -tet_r[3][1], -tet_r[3][2] ) ; glVertex3dv ( tet_r[0] ) ; glVertex3dv ( tet_r[1] ) ; glVertex3dv ( tet_r[2] ) ;
- glEnd() ;
-}
-
-/*
- *
- */
-void FGAPIENTRY glutSolidTetrahedron( void )
-{
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidTetrahedron" );
-
- glBegin( GL_TRIANGLES ) ;
- glNormal3d ( -tet_r[0][0], -tet_r[0][1], -tet_r[0][2] ) ; glVertex3dv ( tet_r[1] ) ; glVertex3dv ( tet_r[3] ) ; glVertex3dv ( tet_r[2] ) ;
- glNormal3d ( -tet_r[1][0], -tet_r[1][1], -tet_r[1][2] ) ; glVertex3dv ( tet_r[0] ) ; glVertex3dv ( tet_r[2] ) ; glVertex3dv ( tet_r[3] ) ;
- glNormal3d ( -tet_r[2][0], -tet_r[2][1], -tet_r[2][2] ) ; glVertex3dv ( tet_r[0] ) ; glVertex3dv ( tet_r[3] ) ; glVertex3dv ( tet_r[1] ) ;
- glNormal3d ( -tet_r[3][0], -tet_r[3][1], -tet_r[3][2] ) ; glVertex3dv ( tet_r[0] ) ; glVertex3dv ( tet_r[1] ) ; glVertex3dv ( tet_r[2] ) ;
- glEnd() ;
-}
-
-/*
- *
- */
static double icos_r[12][3] = {
{ 1.0, 0.0, 0.0 },
{ 0.447213595500, 0.894427191000, 0.0 },
glEnd () ;
}
-void FGAPIENTRY glutWireSierpinskiSponge ( int num_levels, GLdouble offset[3], GLdouble scale )
-{
- int i, j ;
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireSierpinskiSponge" );
- if ( num_levels == 0 )
- {
+/* -- INTERFACE FUNCTIONS -------------------------------------------------- */
+/*
+ * Draws a wireframed cube.
+ */
+void FGAPIENTRY glutWireCube( GLdouble dSize )
+{
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCube" );
+ fghCube( dSize, TRUE );
+}
+void FGAPIENTRY glutSolidCube( GLdouble dSize )
+{
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCube" );
+ fghCube( dSize, FALSE );
+}
- for ( i = 0 ; i < NUM_TETR_FACES ; i++ )
- {
- glBegin ( GL_LINE_LOOP ) ;
- glNormal3d ( -tet_r[i][0], -tet_r[i][1], -tet_r[i][2] ) ;
- for ( j = 0; j < 3; j++ )
- {
- double x = offset[0] + scale * tet_r[tet_i[i][j]][0] ;
- double y = offset[1] + scale * tet_r[tet_i[i][j]][1] ;
- double z = offset[2] + scale * tet_r[tet_i[i][j]][2] ;
- glVertex3d ( x, y, z ) ;
- }
-
- glEnd () ;
- }
- }
- else if ( num_levels > 0 )
- {
- GLdouble local_offset[3] ; /* Use a local variable to avoid buildup of roundoff errors */
- num_levels -- ;
- scale /= 2.0 ;
- for ( i = 0 ; i < NUM_TETR_FACES ; i++ )
- {
- local_offset[0] = offset[0] + scale * tet_r[i][0] ;
- local_offset[1] = offset[1] + scale * tet_r[i][1] ;
- local_offset[2] = offset[2] + scale * tet_r[i][2] ;
- glutWireSierpinskiSponge ( num_levels, local_offset, scale ) ;
- }
- }
+void FGAPIENTRY glutWireOctahedron( void )
+{
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireOctahedron" );
+ fghOctahedron( TRUE );
+}
+void FGAPIENTRY glutSolidOctahedron( void )
+{
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidOctahedron" );
+ fghOctahedron( FALSE );
}
+void FGAPIENTRY glutWireSierpinskiSponge ( int num_levels, GLdouble offset[3], GLdouble scale )
+{
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireSierpinskiSponge" );
+ fghSierpinskiSponge ( num_levels, offset, scale, TRUE );
+}
void FGAPIENTRY glutSolidSierpinskiSponge ( int num_levels, GLdouble offset[3], GLdouble scale )
{
- int i, j ;
-
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidSierpinskiSponge" );
-
- if ( num_levels == 0 )
- {
- glBegin ( GL_TRIANGLES ) ;
-
- for ( i = 0 ; i < NUM_TETR_FACES ; i++ )
- {
- glNormal3d ( -tet_r[i][0], -tet_r[i][1], -tet_r[i][2] ) ;
- for ( j = 0; j < 3; j++ )
- {
- double x = offset[0] + scale * tet_r[tet_i[i][j]][0] ;
- double y = offset[1] + scale * tet_r[tet_i[i][j]][1] ;
- double z = offset[2] + scale * tet_r[tet_i[i][j]][2] ;
- glVertex3d ( x, y, z ) ;
- }
- }
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidSierpinskiSponge" );
+ fghSierpinskiSponge ( num_levels, offset, scale, FALSE );
+}
- glEnd () ;
- }
- else if ( num_levels > 0 )
- {
- GLdouble local_offset[3] ; /* Use a local variable to avoid buildup of roundoff errors */
- num_levels -- ;
- scale /= 2.0 ;
- for ( i = 0 ; i < NUM_TETR_FACES ; i++ )
- {
- local_offset[0] = offset[0] + scale * tet_r[i][0] ;
- local_offset[1] = offset[1] + scale * tet_r[i][1] ;
- local_offset[2] = offset[2] + scale * tet_r[i][2] ;
- glutSolidSierpinskiSponge ( num_levels, local_offset, scale ) ;
- }
- }
+void FGAPIENTRY glutWireTetrahedron( void )
+{
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireTetrahedron" );
+ fghTetrahedron( TRUE );
+}
+void FGAPIENTRY glutSolidTetrahedron( void )
+{
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidTetrahedron" );
+ fghTetrahedron( FALSE );
}
+
/*** END OF FILE ***/
projects / freeglut / blobdiff