b171a73282
polygons. Following recommendations in these manpages, updated the shapes demo by surrounding calls with glFrontFace(GL_CW); and glFrontFace(GL_CCW); git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1190 7f0cb862-5218-0410-a997-914c9d46530a
433 lines
16 KiB
C
433 lines
16 KiB
C
/*! \file shapes.c
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\ingroup demos
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This program is a test harness for the various shapes
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in OpenGLUT. It may also be useful to see which
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parameters control what behavior in the OpenGLUT
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objects.
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Spinning wireframe and solid-shaded shapes are
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displayed. Some parameters can be adjusted.
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Keys:
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- <tt>Esc </tt> Quit
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- <tt>q Q </tt> Quit
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- <tt>i I </tt> Show info
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- <tt>p P </tt> Toggle perspective or orthographic projection
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- <tt>= + </tt> Increase \a slices
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- <tt>- _ </tt> Decreate \a slices
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- <tt>, < </tt> Decreate \a stacks
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- <tt>. > </tt> Increase \a stacks
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- <tt>9 ( </tt> Decreate \a depth (Sierpinski Sponge)
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- <tt>0 ) </tt> Increase \a depth (Sierpinski Sponge)
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- <tt>up </tt> Increase "outer radius"
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- <tt>down </tt> Decrease "outer radius"
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- <tt>left </tt> Decrease "inner radius"
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- <tt>right</tt> Increase "inner radius"
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- <tt>PgUp </tt> Next shape-drawing function
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- <tt>PgDn </tt> Prev shape-drawing function
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\author Written by Nigel Stewart November 2003
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\author Portions Copyright (C) 2004, the OpenGLUT project contributors. <br>
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OpenGLUT branched from freeglut in February, 2004.
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\image html openglut_shapes.png OpenGLUT Geometric Shapes Demonstration
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\include demos/shapes/shapes.c
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*/
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#include <GL/freeglut.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef _MSC_VER
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/* DUMP MEMORY LEAKS */
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#include <crtdbg.h>
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#endif
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/*
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* This macro is only intended to be used on arrays, of course.
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*/
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#define NUMBEROF(x) ((sizeof(x))/(sizeof(x[0])))
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/*
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* These global variables control which object is drawn,
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* and how it is drawn. No object uses all of these
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* variables.
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*/
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static int function_index;
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static int slices = 16;
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static int stacks = 16;
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static double irad = .25;
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static double orad = 1.0; /* doubles as size for objects other than Torus */
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static int depth = 4;
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static double offset[ 3 ] = { 0, 0, 0 };
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static GLboolean show_info = GL_TRUE;
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static float ar;
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static GLboolean persProject = GL_TRUE;
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/*
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* These one-liners draw particular objects, fetching appropriate
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* information from the above globals. They are just thin wrappers
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* for the FreeGLUT objects.
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*/
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static void drawSolidTetrahedron(void) { glutSolidTetrahedron (); }
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static void drawWireTetrahedron(void) { glutWireTetrahedron (); }
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static void drawSolidCube(void) { glutSolidCube(orad); } /* orad doubles as size input */
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static void drawWireCube(void) { glutWireCube(orad); } /* orad doubles as size input */
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static void drawSolidOctahedron(void) { glutSolidOctahedron (); }
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static void drawWireOctahedron(void) { glutWireOctahedron (); }
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static void drawSolidDodecahedron(void) { glutSolidDodecahedron (); }
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static void drawWireDodecahedron(void) { glutWireDodecahedron (); }
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static void drawSolidRhombicDodecahedron(void) { glutSolidRhombicDodecahedron (); }
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static void drawWireRhombicDodecahedron(void) { glutWireRhombicDodecahedron (); }
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static void drawSolidIcosahedron(void) { glutSolidIcosahedron (); }
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static void drawWireIcosahedron(void) { glutWireIcosahedron (); }
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static void drawSolidSierpinskiSponge(void) { glutSolidSierpinskiSponge (depth, offset, orad);} /* orad doubles as size input */
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static void drawWireSierpinskiSponge(void) { glutWireSierpinskiSponge (depth, offset, orad); } /* orad doubles as size input */
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static void drawSolidTorus(void) { glutSolidTorus(irad,orad,slices,stacks); }
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static void drawWireTorus(void) { glutWireTorus (irad,orad,slices,stacks); }
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static void drawSolidSphere(void) { glutSolidSphere(orad,slices,stacks); } /* orad doubles as size input */
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static void drawWireSphere(void) { glutWireSphere(orad,slices,stacks); } /* orad doubles as size input */
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static void drawSolidCone(void) { glutSolidCone(orad,orad,slices,stacks); } /* orad doubles as size input */
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static void drawWireCone(void) { glutWireCone(orad,orad,slices,stacks); } /* orad doubles as size input */
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static void drawSolidCylinder(void) { glutSolidCylinder(orad,orad,slices,stacks); } /* orad doubles as size input */
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static void drawWireCylinder(void) { glutWireCylinder(orad,orad,slices,stacks); } /* orad doubles as size input */
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static void drawSolidTeapot(void)
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{
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/* per Glut manpage, it should be noted that the teapot is rendered
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* with clockwise winding for front facing polygons...
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*/
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glFrontFace(GL_CW);
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glutSolidTeapot(orad); /* orad doubles as size input */
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glFrontFace(GL_CCW);
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}
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static void drawWireTeapot(void)
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{
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/* per Glut manpage, it should be noted that the teapot is rendered
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* with clockwise winding for front facing polygons...
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*/
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glFrontFace(GL_CW);
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glutWireTeapot(orad); /* orad doubles as size input */
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glFrontFace(GL_CCW);
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}
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#define RADIUS 1.0f
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static void drawSolidCuboctahedron(void)
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{
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glBegin( GL_TRIANGLES );
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glNormal3d( 0.577350269189, 0.577350269189, 0.577350269189); glVertex3d( RADIUS, RADIUS, 0.0 ); glVertex3d( 0.0, RADIUS, RADIUS ); glVertex3d( RADIUS, 0.0, RADIUS );
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glNormal3d( 0.577350269189, 0.577350269189,-0.577350269189); glVertex3d( RADIUS, RADIUS, 0.0 ); glVertex3d( RADIUS, 0.0,-RADIUS ); glVertex3d( 0.0, RADIUS,-RADIUS );
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glNormal3d( 0.577350269189,-0.577350269189, 0.577350269189); glVertex3d( RADIUS,-RADIUS, 0.0 ); glVertex3d( RADIUS, 0.0, RADIUS ); glVertex3d( 0.0,-RADIUS, RADIUS );
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glNormal3d( 0.577350269189,-0.577350269189,-0.577350269189); glVertex3d( RADIUS,-RADIUS, 0.0 ); glVertex3d( 0.0,-RADIUS,-RADIUS ); glVertex3d( RADIUS, 0.0,-RADIUS );
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glNormal3d(-0.577350269189, 0.577350269189, 0.577350269189); glVertex3d(-RADIUS, RADIUS, 0.0 ); glVertex3d(-RADIUS, 0.0, RADIUS ); glVertex3d( 0.0, RADIUS, RADIUS );
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glNormal3d(-0.577350269189, 0.577350269189,-0.577350269189); glVertex3d(-RADIUS, RADIUS, 0.0 ); glVertex3d( 0.0, RADIUS,-RADIUS ); glVertex3d(-RADIUS, 0.0,-RADIUS );
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glNormal3d(-0.577350269189,-0.577350269189, 0.577350269189); glVertex3d(-RADIUS,-RADIUS, 0.0 ); glVertex3d( 0.0,-RADIUS, RADIUS ); glVertex3d(-RADIUS, 0.0, RADIUS );
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glNormal3d(-0.577350269189,-0.577350269189,-0.577350269189); glVertex3d(-RADIUS,-RADIUS, 0.0 ); glVertex3d(-RADIUS, 0.0,-RADIUS ); glVertex3d( 0.0,-RADIUS,-RADIUS );
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glEnd();
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glBegin( GL_QUADS );
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glNormal3d( 1.0, 0.0, 0.0 ); glVertex3d( RADIUS, RADIUS, 0.0 ); glVertex3d( RADIUS, 0.0, RADIUS ); glVertex3d( RADIUS,-RADIUS, 0.0 ); glVertex3d( RADIUS, 0.0,-RADIUS );
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glNormal3d(-1.0, 0.0, 0.0 ); glVertex3d(-RADIUS, RADIUS, 0.0 ); glVertex3d(-RADIUS, 0.0,-RADIUS ); glVertex3d(-RADIUS,-RADIUS, 0.0 ); glVertex3d(-RADIUS, 0.0, RADIUS );
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glNormal3d( 0.0, 1.0, 0.0 ); glVertex3d( RADIUS, RADIUS, 0.0 ); glVertex3d( 0.0, RADIUS,-RADIUS ); glVertex3d(-RADIUS, RADIUS, 0.0 ); glVertex3d( 0.0, RADIUS, RADIUS );
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glNormal3d( 0.0,-1.0, 0.0 ); glVertex3d( RADIUS,-RADIUS, 0.0 ); glVertex3d( 0.0,-RADIUS, RADIUS ); glVertex3d(-RADIUS,-RADIUS, 0.0 ); glVertex3d( 0.0,-RADIUS,-RADIUS );
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glNormal3d( 0.0, 0.0, 1.0 ); glVertex3d( RADIUS, 0.0, RADIUS ); glVertex3d( 0.0, RADIUS, RADIUS ); glVertex3d(-RADIUS, 0.0, RADIUS ); glVertex3d( 0.0,-RADIUS, RADIUS );
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glNormal3d( 0.0, 0.0,-1.0 ); glVertex3d( RADIUS, 0.0,-RADIUS ); glVertex3d( 0.0,-RADIUS,-RADIUS ); glVertex3d(-RADIUS, 0.0,-RADIUS ); glVertex3d( 0.0, RADIUS,-RADIUS );
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glEnd();
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}
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static void drawWireCuboctahedron(void)
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{
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glBegin( GL_LINE_LOOP );
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glNormal3d( 1.0, 0.0, 0.0 ); glVertex3d( RADIUS, RADIUS, 0.0 ); glVertex3d( RADIUS, 0.0, RADIUS ); glVertex3d( RADIUS,-RADIUS, 0.0 ); glVertex3d( RADIUS, 0.0,-RADIUS );
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glEnd();
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glBegin( GL_LINE_LOOP );
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glNormal3d(-1.0, 0.0, 0.0 ); glVertex3d(-RADIUS, RADIUS, 0.0 ); glVertex3d(-RADIUS, 0.0,-RADIUS ); glVertex3d(-RADIUS,-RADIUS, 0.0 ); glVertex3d(-RADIUS, 0.0, RADIUS );
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glEnd();
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glBegin( GL_LINE_LOOP );
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glNormal3d( 0.0, 1.0, 0.0 ); glVertex3d( RADIUS, RADIUS, 0.0 ); glVertex3d( 0.0, RADIUS,-RADIUS ); glVertex3d(-RADIUS, RADIUS, 0.0 ); glVertex3d( 0.0, RADIUS, RADIUS );
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glEnd();
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glBegin( GL_LINE_LOOP );
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glNormal3d( 0.0,-1.0, 0.0 ); glVertex3d( RADIUS,-RADIUS, 0.0 ); glVertex3d( 0.0,-RADIUS, RADIUS ); glVertex3d(-RADIUS,-RADIUS, 0.0 ); glVertex3d( 0.0,-RADIUS,-RADIUS );
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glEnd();
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glBegin( GL_LINE_LOOP );
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glNormal3d( 0.0, 0.0, 1.0 ); glVertex3d( RADIUS, 0.0, RADIUS ); glVertex3d( 0.0, RADIUS, RADIUS ); glVertex3d(-RADIUS, 0.0, RADIUS ); glVertex3d( 0.0,-RADIUS, RADIUS );
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glEnd();
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glBegin( GL_LINE_LOOP );
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glNormal3d( 0.0, 0.0,-1.0 ); glVertex3d( RADIUS, 0.0,-RADIUS ); glVertex3d( 0.0,-RADIUS,-RADIUS ); glVertex3d(-RADIUS, 0.0,-RADIUS ); glVertex3d( 0.0, RADIUS,-RADIUS );
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glEnd();
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}
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#undef RADIUS
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/*
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* This structure defines an entry in our function-table.
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*/
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typedef struct
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{
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const char * const name;
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void (*solid) (void);
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void (*wire) (void);
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} entry;
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#define ENTRY(e) {#e, drawSolid##e, drawWire##e}
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static const entry table [] =
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{
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ENTRY (Tetrahedron),
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ENTRY (Cube),
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ENTRY (Octahedron),
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ENTRY (Dodecahedron),
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ENTRY (RhombicDodecahedron),
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ENTRY (Icosahedron),
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ENTRY (SierpinskiSponge),
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ENTRY (Teapot),
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ENTRY (Torus),
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ENTRY (Sphere),
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ENTRY (Cone),
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ENTRY (Cylinder),
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ENTRY (Cuboctahedron)
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};
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#undef ENTRY
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/*!
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Does printf()-like work using freeglut
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glutBitmapString(). Uses a fixed font. Prints
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at the indicated row/column position.
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Limitation: Cannot address pixels.
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Limitation: Renders in screen coords, not model coords.
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*/
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static void shapesPrintf (int row, int col, const char *fmt, ...)
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{
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static char buf[256];
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int viewport[4];
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void *font = GLUT_BITMAP_9_BY_15;
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va_list args;
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va_start(args, fmt);
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#if defined(WIN32) && !defined(__CYGWIN__)
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(void) _vsnprintf (buf, sizeof(buf), fmt, args);
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#else
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(void) vsnprintf (buf, sizeof(buf), fmt, args);
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#endif
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va_end(args);
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glGetIntegerv(GL_VIEWPORT,viewport);
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glPushMatrix();
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glLoadIdentity();
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glMatrixMode(GL_PROJECTION);
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glPushMatrix();
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glLoadIdentity();
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glOrtho(0,viewport[2],0,viewport[3],-1,1);
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glRasterPos2i
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(
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glutBitmapWidth(font, ' ') * col,
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- glutBitmapHeight(font) * row + viewport[3]
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);
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glutBitmapString (font, (unsigned char*)buf);
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glPopMatrix();
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glMatrixMode(GL_MODELVIEW);
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glPopMatrix();
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}
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/* GLUT callback Handlers */
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static void
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resize(int width, int height)
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{
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ar = (float) width / (float) height;
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glViewport(0, 0, width, height);
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}
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static void display(void)
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{
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const double t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
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const double a = t*90.0;
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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if (persProject)
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glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);
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else
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glOrtho(-ar*3, ar*3, -3.0, 3.0, 2.0, 100.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glEnable(GL_LIGHTING);
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glColor3d(1,0,0);
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glPushMatrix();
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glTranslated(0,1.2,-6);
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glRotated(60,1,0,0);
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glRotated(a,0,0,1);
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table [function_index].solid ();
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glPopMatrix();
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glPushMatrix();
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glTranslated(0,-1.2,-6);
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glRotated(60,1,0,0);
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glRotated(a,0,0,1);
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table [function_index].wire ();
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glPopMatrix();
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glDisable(GL_LIGHTING);
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glColor3d(0.1,0.1,0.4);
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if( show_info ) {
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shapesPrintf (1, 1, "Shape PgUp PgDn: %s", table [function_index].name);
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shapesPrintf (2, 1, "Slices +-: %d Stacks <>: %d", slices, stacks);
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shapesPrintf (3, 1, "nSides +-: %d nRings <>: %d", slices, stacks);
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shapesPrintf (4, 1, "Depth (): %d", depth);
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shapesPrintf (5, 1, "Outer radius Up Down : %f", orad);
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shapesPrintf (6, 1, "Inner radius Left Right: %f", irad);
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} else {
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printf ( "Shape %d slides %d stacks %d\n", function_index, slices, stacks ) ;
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}
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glutSwapBuffers();
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}
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static void
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key(unsigned char key, int x, int y)
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{
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switch (key)
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{
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case 27 :
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case 'Q':
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case 'q': glutLeaveMainLoop () ; break;
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case 'I':
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case 'i': show_info = ( show_info == GL_TRUE ) ? GL_FALSE : GL_TRUE; break;
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case '=':
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case '+': slices++; break;
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case '-':
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case '_': if( slices > -1 ) slices--; break;
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case ',':
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case '<': if( stacks > -1 ) stacks--; break;
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case '.':
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case '>': stacks++; break;
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case '9':
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case '(': if( depth > -1 ) depth--; break;
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case '0':
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case ')': ++depth; break;
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case 'P':
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case 'p': persProject=!persProject; break;
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default:
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break;
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}
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glutPostRedisplay();
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}
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static void special (int key, int x, int y)
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{
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switch (key)
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{
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case GLUT_KEY_PAGE_UP: ++function_index; break;
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case GLUT_KEY_PAGE_DOWN: --function_index; break;
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case GLUT_KEY_UP: orad *= 2; break;
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case GLUT_KEY_DOWN: orad /= 2; break;
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case GLUT_KEY_RIGHT: irad *= 2; break;
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case GLUT_KEY_LEFT: irad /= 2; break;
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default:
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break;
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}
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if (0 > function_index)
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function_index = NUMBEROF (table) - 1;
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if (NUMBEROF (table) <= ( unsigned )function_index)
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function_index = 0;
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}
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static void
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idle(void)
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{
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glutPostRedisplay();
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}
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const GLfloat light_ambient[] = { 0.0f, 0.0f, 0.0f, 1.0f };
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const GLfloat light_diffuse[] = { 1.0f, 1.0f, 1.0f, 1.0f };
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const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
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const GLfloat light_position[] = { 2.0f, 5.0f, 5.0f, 0.0f };
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const GLfloat mat_ambient[] = { 0.7f, 0.7f, 0.7f, 1.0f };
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const GLfloat mat_diffuse[] = { 0.8f, 0.8f, 0.8f, 1.0f };
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const GLfloat mat_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
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const GLfloat high_shininess[] = { 100.0f };
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/* Program entry point */
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int
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main(int argc, char *argv[])
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{
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glutInitWindowSize(640,480);
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glutInitWindowPosition(40,40);
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glutInit(&argc, argv);
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glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH | GLUT_MULTISAMPLE);
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glutCreateWindow("FreeGLUT Shapes");
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glutReshapeFunc(resize);
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glutDisplayFunc(display);
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glutKeyboardFunc(key);
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glutSpecialFunc(special);
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glutIdleFunc(idle);
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glutSetOption ( GLUT_ACTION_ON_WINDOW_CLOSE, GLUT_ACTION_CONTINUE_EXECUTION ) ;
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glClearColor(1,1,1,1);
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glEnable(GL_CULL_FACE);
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glCullFace(GL_BACK);
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glEnable(GL_DEPTH_TEST);
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glDepthFunc(GL_LESS);
|
|
|
|
glEnable(GL_LIGHT0);
|
|
glEnable(GL_NORMALIZE);
|
|
glEnable(GL_COLOR_MATERIAL);
|
|
|
|
glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
|
|
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
|
|
glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
|
|
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
|
|
|
|
glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
|
|
glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
|
|
glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
|
|
glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);
|
|
|
|
glutMainLoop();
|
|
|
|
#ifdef _MSC_VER
|
|
/* DUMP MEMORY LEAK INFORMATION */
|
|
_CrtDumpMemoryLeaks () ;
|
|
#endif
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|