From fcbb66a9394eaf4059bc942df6729b4b55a057d8 Mon Sep 17 00:00:00 2001
From: inmarket <andrewh@inmarket.com.au>
Date: Wed, 20 Aug 2014 13:55:17 +1000
Subject: Add gl3d gears demo

---
 demos/modules/gwin/gl3d-gears/main.c | 287 +++++++++++++++++++++++++++++++++++
 1 file changed, 287 insertions(+)
 create mode 100644 demos/modules/gwin/gl3d-gears/main.c

(limited to 'demos/modules/gwin/gl3d-gears/main.c')

diff --git a/demos/modules/gwin/gl3d-gears/main.c b/demos/modules/gwin/gl3d-gears/main.c
new file mode 100644
index 00000000..4ee189af
--- /dev/null
+++ b/demos/modules/gwin/gl3d-gears/main.c
@@ -0,0 +1,287 @@
+/*
+ * Copyright (c) 2012, 2013, Joel Bodenmann aka Tectu <joel@unormal.org>
+ * Copyright (c) 2012, 2013, Andrew Hannam aka inmarket
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *    * Neither the name of the <organization> nor the
+ *      names of its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "gfx.h"
+
+#include <math.h>
+#ifndef M_PI
+#  define M_PI 3.14159265
+#endif
+
+/* The handle for our Window */
+GHandle gh;
+
+/*
+ * Draw a gear wheel.  You'll probably want to call this function when
+ * building a display list since we do a lot of trig here.
+ *
+ * Input:  inner_radius - radius of hole at center
+ *         outer_radius - radius at center of teeth
+ *         width - width of gear
+ *         teeth - number of teeth
+ *         tooth_depth - depth of tooth
+ */
+static void gear( GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
+		  GLint teeth, GLfloat tooth_depth )
+{
+   GLint i;
+   GLfloat r0, r1, r2;
+   GLfloat angle, da;
+   GLfloat u, v, len;
+
+   r0 = inner_radius;
+   r1 = outer_radius - tooth_depth/2.0;
+   r2 = outer_radius + tooth_depth/2.0;
+
+   da = 2.0*M_PI / teeth / 4.0;
+
+   glShadeModel( GL_FLAT );
+
+   glNormal3f( 0.0, 0.0, 1.0 );
+
+   /* draw front face */
+   glBegin( GL_QUAD_STRIP );
+   for (i=0;i<=teeth;i++) {
+      angle = i * 2.0*M_PI / teeth;
+      glVertex3f( r0*cos(angle), r0*sin(angle), width*0.5 );
+      glVertex3f( r1*cos(angle), r1*sin(angle), width*0.5 );
+      glVertex3f( r0*cos(angle), r0*sin(angle), width*0.5 );
+      glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), width*0.5 );
+   }
+   glEnd();
+
+   /* draw front sides of teeth */
+   glBegin( GL_QUADS );
+   da = 2.0*M_PI / teeth / 4.0;
+   for (i=0;i<teeth;i++) {
+      angle = i * 2.0*M_PI / teeth;
+
+      glVertex3f( r1*cos(angle),      r1*sin(angle),      width*0.5 );
+      glVertex3f( r2*cos(angle+da),   r2*sin(angle+da),   width*0.5 );
+      glVertex3f( r2*cos(angle+2*da), r2*sin(angle+2*da), width*0.5 );
+      glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), width*0.5 );
+   }
+   glEnd();
+
+
+   glNormal3f( 0.0, 0.0, -1.0 );
+
+   /* draw back face */
+   glBegin( GL_QUAD_STRIP );
+   for (i=0;i<=teeth;i++) {
+      angle = i * 2.0*M_PI / teeth;
+      glVertex3f( r1*cos(angle), r1*sin(angle), -width*0.5 );
+      glVertex3f( r0*cos(angle), r0*sin(angle), -width*0.5 );
+      glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), -width*0.5 );
+      glVertex3f( r0*cos(angle), r0*sin(angle), -width*0.5 );
+   }
+   glEnd();
+
+   /* draw back sides of teeth */
+   glBegin( GL_QUADS );
+   da = 2.0*M_PI / teeth / 4.0;
+   for (i=0;i<teeth;i++) {
+      angle = i * 2.0*M_PI / teeth;
+
+      glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), -width*0.5 );
+      glVertex3f( r2*cos(angle+2*da), r2*sin(angle+2*da), -width*0.5 );
+      glVertex3f( r2*cos(angle+da),   r2*sin(angle+da),   -width*0.5 );
+      glVertex3f( r1*cos(angle),      r1*sin(angle),      -width*0.5 );
+   }
+   glEnd();
+
+
+   /* draw outward faces of teeth */
+   glBegin( GL_QUAD_STRIP );
+   for (i=0;i<teeth;i++) {
+      angle = i * 2.0*M_PI / teeth;
+
+      glVertex3f( r1*cos(angle),      r1*sin(angle),       width*0.5 );
+      glVertex3f( r1*cos(angle),      r1*sin(angle),      -width*0.5 );
+      u = r2*cos(angle+da) - r1*cos(angle);
+      v = r2*sin(angle+da) - r1*sin(angle);
+      len = sqrt( u*u + v*v );
+      u /= len;
+      v /= len;
+      glNormal3f( v, -u, 0.0 );
+      glVertex3f( r2*cos(angle+da),   r2*sin(angle+da),    width*0.5 );
+      glVertex3f( r2*cos(angle+da),   r2*sin(angle+da),   -width*0.5 );
+      glNormal3f( cos(angle), sin(angle), 0.0 );
+      glVertex3f( r2*cos(angle+2*da), r2*sin(angle+2*da),  width*0.5 );
+      glVertex3f( r2*cos(angle+2*da), r2*sin(angle+2*da), -width*0.5 );
+      u = r1*cos(angle+3*da) - r2*cos(angle+2*da);
+      v = r1*sin(angle+3*da) - r2*sin(angle+2*da);
+      glNormal3f( v, -u, 0.0 );
+      glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da),  width*0.5 );
+      glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), -width*0.5 );
+      glNormal3f( cos(angle), sin(angle), 0.0 );
+   }
+
+   glVertex3f( r1*cos(0), r1*sin(0), width*0.5 );
+   glVertex3f( r1*cos(0), r1*sin(0), -width*0.5 );
+
+   glEnd();
+
+
+   glShadeModel( GL_SMOOTH );
+
+   /* draw inside radius cylinder */
+   glBegin( GL_QUAD_STRIP );
+   for (i=0;i<=teeth;i++) {
+      angle = i * 2.0*M_PI / teeth;
+      glNormal3f( -cos(angle), -sin(angle), 0.0 );
+      glVertex3f( r0*cos(angle), r0*sin(angle), -width*0.5 );
+      glVertex3f( r0*cos(angle), r0*sin(angle), width*0.5 );
+   }
+   glEnd();
+
+}
+
+
+static GLfloat view_rotx=20.0, view_roty=30.0, view_rotz=0.0;
+static GLint gear1, gear2, gear3;
+static GLfloat angle = 0.0;
+
+static void draw( void )
+{
+   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+
+   glPushMatrix();
+   glRotatef( view_rotx, 1.0, 0.0, 0.0 );
+   glRotatef( view_roty, 0.0, 1.0, 0.0 );
+   glRotatef( view_rotz, 0.0, 0.0, 1.0 );
+
+   glPushMatrix();
+   glTranslatef( -3.0, -2.0, 0.0 );
+   glRotatef( angle, 0.0, 0.0, 1.0 );
+   glCallList(gear1);
+   glPopMatrix();
+
+   glPushMatrix();
+   glTranslatef( 3.1, -2.0, 0.0 );
+   glRotatef( -2.0*angle-9.0, 0.0, 0.0, 1.0 );
+   glCallList(gear2);
+   glPopMatrix();
+
+   glPushMatrix();
+   glTranslatef( -3.1, 4.2, 0.0 );
+   glRotatef( -2.0*angle-25.0, 0.0, 0.0, 1.0 );
+   glCallList(gear3);
+   glPopMatrix();
+
+   glPopMatrix();
+
+   gwinRedraw(gh);
+}
+
+
+static void spin( void )
+{
+   angle += 2.0;
+   draw();
+}
+
+/* new window size or exposure */
+static void setup(void)
+{
+   GLfloat  h = (GLfloat) gwinGetWidth(gh) / (GLfloat) gwinGetHeight(gh);
+
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glFrustum( -1.0, 1.0, -h, h, 5.0, 60.0 );
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+   glTranslatef( 0.0, 0.0, -40.0 );
+   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+}
+
+
+static void init( void )
+{
+   static GLfloat pos[4] = {5.0, 5.0, 10.0, 0.0 };
+   static GLfloat red[4] = {0.8, 0.1, 0.0, 1.0 };
+   static GLfloat green[4] = {0.0, 0.8, 0.2, 1.0 };
+   static GLfloat blue[4] = {0.2, 0.2, 1.0, 1.0 };
+
+   glLightfv( GL_LIGHT0, GL_POSITION, pos );
+   glEnable( GL_CULL_FACE );
+   glEnable( GL_LIGHTING );
+   glEnable( GL_LIGHT0 );
+   glEnable( GL_DEPTH_TEST );
+
+   /* make the gears */
+   gear1 = glGenLists(1);
+   glNewList(gear1, GL_COMPILE);
+   glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red );
+   gear( 1.0, 4.0, 1.0, 20, 0.7 );
+   glEndList();
+
+   gear2 = glGenLists(1);
+   glNewList(gear2, GL_COMPILE);
+   glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green );
+   gear( 0.5, 2.0, 2.0, 10, 0.7 );
+   glEndList();
+
+   gear3 = glGenLists(1);
+   glNewList(gear3, GL_COMPILE);
+   glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue );
+   gear( 1.3, 2.0, 0.5, 10, 0.7 );
+   glEndList();
+
+   glEnable( GL_NORMALIZE );
+}
+
+int main(void) {
+    /* Initialize and clear the display */
+    gfxInit();
+    gdispClear(White);
+
+    /* Create the 3D window */
+    {
+    	GWindowInit	wi;
+
+		gwinClearInit(&wi);
+    	wi.show = TRUE; wi.x = 8; wi.y = 8; wi.width = gdispGetWidth()-16; wi.height = gdispGetHeight()-16;
+        gh = gwinGL3DCreate(0, &wi);
+    }
+
+    /* Init the 3D stuff */
+    setup();
+    init();
+
+    while(TRUE) {
+
+    	// rate control
+    	gfxSleepMilliseconds(10);
+
+    	// move and redraw
+    	spin();
+    }   
+}
+
-- 
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