481 lines
15 KiB
C
481 lines
15 KiB
C
/*
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(c) Copyright 2001 convergence integrated media GmbH.
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All rights reserved.
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Written by Denis Oliver Kropp <dok@convergence.de> and
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Andreas Hundt <andi@convergence.de>.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the
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Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include <directfb.h>
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#include <directfbgl.h>
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#include <GL/gl.h>
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/* the super interface */
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IDirectFB *dfb;
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/* the primary surface (surface of primary layer) */
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IDirectFBSurface *primary;
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/* the GL context */
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IDirectFBGL *primary_gl;
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/* our font */
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IDirectFBFont *font;
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/* event buffer */
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IDirectFBEventBuffer *events;
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/* macro for a safe call to DirectFB functions */
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#define DFBCHECK(x...) \
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{ \
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err = x; \
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if (err != DFB_OK) { \
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fprintf( stderr, "%s <%d>:\n\t", __FILE__, __LINE__ ); \
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DirectFBErrorFatal( #x, err ); \
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} \
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}
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static int screen_width, screen_height;
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static unsigned long T0 = 0;
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static GLint Frames = 0;
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static GLfloat fps = 0;
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static inline unsigned long get_millis()
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{
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struct timeval tv;
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gettimeofday (&tv, NULL);
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return (tv.tv_sec * 1000 + tv.tv_usec / 1000);
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}
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#ifndef M_PI
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#define M_PI 3.14159265
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#endif
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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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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
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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), 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), width * 0.5);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), 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), -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), -width * 0.5);
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glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -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), width * 0.5);
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glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -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), width * 0.5);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -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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static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
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static GLfloat inc_rotx = 0, inc_roty = 0, inc_rotz = 0;
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static GLint gear1, gear2, gear3;
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static GLfloat angle = 0.0;
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static void
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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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static void
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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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static void
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init(int argc, char *argv[])
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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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GLint i;
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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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for ( i=1; i<argc; i++ ) {
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if (strcmp(argv[i], "-info")==0) {
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printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
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printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
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printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
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printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
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}
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}
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}
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int main( int argc, char *argv[] )
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{
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int quit = 0;
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DFBResult err;
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DFBSurfaceDescription dsc;
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DFBCHECK(DirectFBInit( &argc, &argv ));
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/* create the super interface */
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DFBCHECK(DirectFBCreate( &dfb ));
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/* create an event buffer for all devices with these caps */
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DFBCHECK(dfb->CreateInputEventBuffer( dfb, DICAPS_KEYS | DICAPS_AXES,
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DFB_FALSE, &events ));
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/* set our cooperative level to DFSCL_FULLSCREEN
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for exclusive access to the primary layer */
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dfb->SetCooperativeLevel( dfb, DFSCL_FULLSCREEN );
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/* get the primary surface, i.e. the surface of the
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primary layer we have exclusive access to */
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dsc.flags = DSDESC_CAPS;
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dsc.caps = DSCAPS_PRIMARY | DSCAPS_DOUBLE;
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DFBCHECK(dfb->CreateSurface( dfb, &dsc, &primary ));
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/* get the size of the surface and fill it */
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DFBCHECK(primary->GetSize( primary, &screen_width, &screen_height ));
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DFBCHECK(primary->FillRectangle( primary, 0, 0,
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screen_width, screen_height ));
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primary->Flip( primary, NULL, 0 );
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/* create the default font and set it */
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DFBCHECK(dfb->CreateFont( dfb, NULL, NULL, &font ));
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DFBCHECK(primary->SetFont( primary, font ));
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/* get the GL context */
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DFBCHECK(primary->GetGL( primary, &primary_gl ));
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DFBCHECK(primary_gl->Lock( primary_gl ));
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init(argc, argv);
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reshape(screen_width, screen_height);
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DFBCHECK(primary_gl->Unlock( primary_gl ));
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T0 = get_millis();
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while (!quit) {
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DFBInputEvent evt;
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unsigned long t;
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DFBCHECK(primary_gl->Lock( primary_gl ));
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draw();
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DFBCHECK(primary_gl->Unlock( primary_gl ));
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if (fps) {
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char buf[64];
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snprintf(buf, 64, "%4.1f FPS\n", fps);
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primary->SetColor( primary, 0xff, 0, 0, 0xff );
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primary->DrawString( primary, buf, -1, screen_width - 5, 5, DSTF_TOPRIGHT );
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}
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primary->Flip( primary, NULL, 0 );
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Frames++;
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t = get_millis();
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if (t - T0 >= 2000) {
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GLfloat seconds = (t - T0) / 1000.0;
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fps = Frames / seconds;
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T0 = t;
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Frames = 0;
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}
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while (events->GetEvent( events, DFB_EVENT(&evt) ) == DFB_OK) {
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switch (evt.type) {
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case DIET_KEYPRESS:
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switch (evt.key_symbol) {
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case DIKS_ESCAPE:
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quit = 1;
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break;
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case DIKS_CURSOR_UP:
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inc_rotx = 5.0;
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break;
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case DIKS_CURSOR_DOWN:
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inc_rotx = -5.0;
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break;
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case DIKS_CURSOR_LEFT:
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inc_roty = 5.0;
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break;
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case DIKS_CURSOR_RIGHT:
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inc_roty = -5.0;
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break;
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case DIKS_PAGE_UP:
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inc_rotz = 5.0;
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break;
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case DIKS_PAGE_DOWN:
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inc_rotz = -5.0;
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break;
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default:
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;
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}
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break;
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case DIET_KEYRELEASE:
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switch (evt.key_symbol) {
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case DIKS_CURSOR_UP:
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inc_rotx = 0;
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break;
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case DIKS_CURSOR_DOWN:
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inc_rotx = 0;
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break;
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case DIKS_CURSOR_LEFT:
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inc_roty = 0;
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break;
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case DIKS_CURSOR_RIGHT:
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inc_roty = 0;
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break;
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case DIKS_PAGE_UP:
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inc_rotz = 0;
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break;
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case DIKS_PAGE_DOWN:
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inc_rotz = 0;
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break;
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default:
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;
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}
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break;
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case DIET_AXISMOTION:
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if (evt.flags & DIEF_AXISREL) {
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switch (evt.axis) {
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case DIAI_X:
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view_roty += evt.axisrel / 2.0;
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break;
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case DIAI_Y:
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view_rotx += evt.axisrel / 2.0;
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break;
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case DIAI_Z:
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view_rotz += evt.axisrel / 2.0;
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break;
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default:
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;
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}
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}
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break;
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default:
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;
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}
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}
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angle += 2.0;
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view_rotx += inc_rotx;
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view_roty += inc_roty;
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view_rotz += inc_rotz;
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}
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/* release our interfaces to shutdown DirectFB */
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primary_gl->Release( primary_gl );
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primary->Release( primary );
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font->Release( font );
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events->Release( events );
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dfb->Release( dfb );
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return 0;
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}
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