276 lines
8.3 KiB
C
276 lines
8.3 KiB
C
/*
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* Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* This is a port of the infamous "glxgears" demo to straight EGL
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* Port by Dane Rushton 10 July 2005
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*
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* No command line options.
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* Program runs for 5 seconds then exits, outputing framerate to console
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*/
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#include <math.h>
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#include <sys/time.h>
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#include <GL/gl.h>
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#include <GL/glu.h>
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#include "eglut.h"
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static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
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static GLint gear1, gear2, gear3;
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GLfloat angle = 0.0;
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/*
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*
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* Draw a gear wheel. You'll probably want to call this function when
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* building a display list since we do a lot of trig here.
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*
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* Input: inner_radius - radius of hole at center
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* outer_radius - radius at center of teeth
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* width - width of gear
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* teeth - number of teeth
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* tooth_depth - depth of tooth
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*/
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static void gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
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GLint teeth, GLfloat tooth_depth)
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{
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GLint i;
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GLfloat r0, r1, r2;
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GLfloat angle, da;
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GLfloat u, v, len;
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r0 = inner_radius;
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r1 = outer_radius - tooth_depth / 2.0;
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r2 = outer_radius + tooth_depth / 2.0;
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da = 2.0 * M_PI / teeth / 4.0;
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glShadeModel(GL_FLAT);
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glNormal3f(0.0, 0.0, 1.0);
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/* draw front face */
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glBegin(GL_QUAD_STRIP);
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for (i = 0; i <= teeth; i++) {
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angle = i * 2.0 * M_PI / teeth;
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glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
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glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
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if (i < teeth) {
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glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
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width * 0.5);
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}
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}
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glEnd();
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/* draw front sides of teeth */
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glBegin(GL_QUADS);
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da = 2.0 * M_PI / teeth / 4.0;
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for (i = 0; i < teeth; i++) {
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angle = i * 2.0 * M_PI / teeth;
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glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
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glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
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glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
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width * 0.5);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
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width * 0.5);
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}
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glEnd();
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glNormal3f(0.0, 0.0, -1.0);
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/* draw back face */
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glBegin(GL_QUAD_STRIP);
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for (i = 0; i <= teeth; i++) {
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angle = i * 2.0 * M_PI / teeth;
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glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
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glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
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if (i < teeth) {
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
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-width * 0.5);
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glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
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}
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}
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glEnd();
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/* draw back sides of teeth */
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glBegin(GL_QUADS);
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da = 2.0 * M_PI / teeth / 4.0;
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for (i = 0; i < teeth; i++) {
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angle = i * 2.0 * M_PI / teeth;
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
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-width * 0.5);
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glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
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-width * 0.5);
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glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
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glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
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}
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glEnd();
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/* draw outward faces of teeth */
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glBegin(GL_QUAD_STRIP);
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for (i = 0; i < teeth; i++) {
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angle = i * 2.0 * M_PI / teeth;
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glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
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glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
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u = r2 * cos(angle + da) - r1 * cos(angle);
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v = r2 * sin(angle + da) - r1 * sin(angle);
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len = sqrt(u * u + v * v);
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u /= len;
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v /= len;
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glNormal3f(v, -u, 0.0);
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glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
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glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
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glNormal3f(cos(angle), sin(angle), 0.0);
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glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
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width * 0.5);
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glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
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-width * 0.5);
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u = r1 * cos(angle + 3 * da) - r2 * cos(angle + 2 * da);
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v = r1 * sin(angle + 3 * da) - r2 * sin(angle + 2 * da);
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glNormal3f(v, -u, 0.0);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
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width * 0.5);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
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-width * 0.5);
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glNormal3f(cos(angle), sin(angle), 0.0);
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}
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glVertex3f(r1 * cos(0), r1 * sin(0), width * 0.5);
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glVertex3f(r1 * cos(0), r1 * sin(0), -width * 0.5);
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glEnd();
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glShadeModel(GL_SMOOTH);
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/* draw inside radius cylinder */
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glBegin(GL_QUAD_STRIP);
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for (i = 0; i <= teeth; i++) {
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angle = i * 2.0 * M_PI / teeth;
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glNormal3f(-cos(angle), -sin(angle), 0.0);
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glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
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glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
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}
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glEnd();
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}
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void draw(void)
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{
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glPushMatrix();
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glRotatef(view_rotx, 1.0, 0.0, 0.0);
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glRotatef(view_roty, 0.0, 1.0, 0.0);
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glRotatef(view_rotz, 0.0, 0.0, 1.0);
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glPushMatrix();
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glTranslatef(-3.0, -2.0, 0.0);
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glRotatef(angle, 0.0, 0.0, 1.0);
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glCallList(gear1);
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glPopMatrix();
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glPushMatrix();
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glTranslatef(3.1, -2.0, 0.0);
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glRotatef(-2.0 * angle - 9.0, 0.0, 0.0, 1.0);
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glCallList(gear2);
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glPopMatrix();
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glPushMatrix();
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glTranslatef(-3.1, 4.2, 0.0);
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glRotatef(-2.0 * angle - 25.0, 0.0, 0.0, 1.0);
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glCallList(gear3);
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glPopMatrix();
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glPopMatrix();
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}
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/* new window size or exposure */
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void reshape(int width, int height)
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{
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GLfloat h = (GLfloat) height / (GLfloat) width;
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glViewport(0, 0, (GLint) width, (GLint) height);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef(0.0, 0.0, -40.0);
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}
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void init(void)
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{
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static GLfloat pos[4] = { 5.0, 5.0, 10.0, 0.0 };
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static GLfloat red[4] = { 0.8, 0.1, 0.0, 1.0 };
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static GLfloat green[4] = { 0.0, 0.8, 0.2, 1.0 };
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static GLfloat blue[4] = { 0.2, 0.2, 1.0, 1.0 };
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glLightfv(GL_LIGHT0, GL_POSITION, pos);
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glEnable(GL_CULL_FACE);
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glEnable(GL_LIGHTING);
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glEnable(GL_LIGHT0);
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glEnable(GL_DEPTH_TEST);
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/* make the gears */
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gear1 = glGenLists(1);
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glNewList(gear1, GL_COMPILE);
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glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
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gear(1.0, 4.0, 1.0, 20, 0.7);
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glEndList();
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gear2 = glGenLists(1);
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glNewList(gear2, GL_COMPILE);
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glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
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gear(0.5, 2.0, 2.0, 10, 0.7);
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glEndList();
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gear3 = glGenLists(1);
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glNewList(gear3, GL_COMPILE);
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glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
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gear(1.3, 2.0, 0.5, 10, 0.7);
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glEndList();
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glEnable(GL_NORMALIZE);
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}
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void keyboard(unsigned char key)
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{
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if (key == EGLUT_KEY_LEFT) {
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view_roty += 5.0;
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}
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else if (key == EGLUT_KEY_RIGHT) {
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view_roty -= 5.0;
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}
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else if (key == EGLUT_KEY_UP) {
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view_rotx += 5.0;
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}
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else if (key == EGLUT_KEY_DOWN) {
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view_rotx -= 5.0;
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}
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}
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