1/*
2 * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included
12 * in all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
18 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20 */
21
22/*
23 * This is a port of the infamous "glxgears" demo to straight EGL
24 * Port by Dane Rushton 10 July 2005
25 *
26 * No command line options.
27 * Program runs for 5 seconds then exits, outputing framerate to console
28 */
29
30#define EGL_EGLEXT_PROTOTYPES
31
32#include <assert.h>
33#include <math.h>
34#include <stdlib.h>
35#include <stdio.h>
36#include <string.h>
37#include "gl_wrap.h"
38#include <EGL/egl.h>
39#include <EGL/eglext.h>
40
41#define MAX_CONFIGS 10
42#define MAX_MODES 100
43
44#define BENCHMARK
45
46#ifdef BENCHMARK
47
48/* XXX this probably isn't very portable */
49
50#include <sys/time.h>
51#include <unistd.h>
52
53/* return current time (in seconds) */
54static double
55current_time(void)
56{
57   struct timeval tv;
58#ifdef __VMS
59   (void) gettimeofday(&tv, NULL );
60#else
61   struct timezone tz;
62   (void) gettimeofday(&tv, &tz);
63#endif
64   return (double) tv.tv_sec + tv.tv_usec / 1000000.0;
65}
66
67#else /*BENCHMARK*/
68
69/* dummy */
70static double
71current_time(void)
72{
73   /* update this function for other platforms! */
74   static double t = 0.0;
75   static int warn = 1;
76   if (warn) {
77      fprintf(stderr, "Warning: current_time() not implemented!!\n");
78      warn = 0;
79   }
80   return t += 1.0;
81}
82
83#endif /*BENCHMARK*/
84
85
86#ifndef M_PI
87#define M_PI 3.14159265
88#endif
89
90
91static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
92static GLint gear1, gear2, gear3;
93static GLfloat angle = 0.0;
94
95#if 0
96static GLfloat eyesep = 5.0;		/* Eye separation. */
97static GLfloat fix_point = 40.0;	/* Fixation point distance.  */
98static GLfloat left, right, asp;	/* Stereo frustum params.  */
99#endif
100
101
102/*
103 *
104 *  Draw a gear wheel.  You'll probably want to call this function when
105 *  building a display list since we do a lot of trig here.
106 *
107 *  Input:  inner_radius - radius of hole at center
108 *          outer_radius - radius at center of teeth
109 *          width - width of gear
110 *          teeth - number of teeth
111 *          tooth_depth - depth of tooth
112 */
113static void
114gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
115     GLint teeth, GLfloat tooth_depth)
116{
117   GLint i;
118   GLfloat r0, r1, r2;
119   GLfloat angle, da;
120   GLfloat u, v, len;
121
122   r0 = inner_radius;
123   r1 = outer_radius - tooth_depth / 2.0;
124   r2 = outer_radius + tooth_depth / 2.0;
125
126   da = 2.0 * M_PI / teeth / 4.0;
127
128   glShadeModel(GL_FLAT);
129
130   glNormal3f(0.0, 0.0, 1.0);
131
132   /* draw front face */
133   glBegin(GL_QUAD_STRIP);
134   for (i = 0; i <= teeth; i++) {
135      angle = i * 2.0 * M_PI / teeth;
136      glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
137      glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
138      if (i < teeth) {
139	 glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
140	 glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
141		    width * 0.5);
142      }
143   }
144   glEnd();
145
146   /* draw front sides of teeth */
147   glBegin(GL_QUADS);
148   da = 2.0 * M_PI / teeth / 4.0;
149   for (i = 0; i < teeth; i++) {
150      angle = i * 2.0 * M_PI / teeth;
151
152      glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
153      glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
154      glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
155		 width * 0.5);
156      glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
157		 width * 0.5);
158   }
159   glEnd();
160
161   glNormal3f(0.0, 0.0, -1.0);
162
163   /* draw back face */
164   glBegin(GL_QUAD_STRIP);
165   for (i = 0; i <= teeth; i++) {
166      angle = i * 2.0 * M_PI / teeth;
167      glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
168      glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
169      if (i < teeth) {
170	 glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
171		    -width * 0.5);
172	 glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
173      }
174   }
175   glEnd();
176
177   /* draw back sides of teeth */
178   glBegin(GL_QUADS);
179   da = 2.0 * M_PI / teeth / 4.0;
180   for (i = 0; i < teeth; i++) {
181      angle = i * 2.0 * M_PI / teeth;
182
183      glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
184		 -width * 0.5);
185      glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
186		 -width * 0.5);
187      glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
188      glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
189   }
190   glEnd();
191
192   /* draw outward faces of teeth */
193   glBegin(GL_QUAD_STRIP);
194   for (i = 0; i < teeth; i++) {
195      angle = i * 2.0 * M_PI / teeth;
196
197      glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
198      glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
199      u = r2 * cos(angle + da) - r1 * cos(angle);
200      v = r2 * sin(angle + da) - r1 * sin(angle);
201      len = sqrt(u * u + v * v);
202      u /= len;
203      v /= len;
204      glNormal3f(v, -u, 0.0);
205      glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
206      glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
207      glNormal3f(cos(angle), sin(angle), 0.0);
208      glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
209		 width * 0.5);
210      glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
211		 -width * 0.5);
212      u = r1 * cos(angle + 3 * da) - r2 * cos(angle + 2 * da);
213      v = r1 * sin(angle + 3 * da) - r2 * sin(angle + 2 * da);
214      glNormal3f(v, -u, 0.0);
215      glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
216		 width * 0.5);
217      glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
218		 -width * 0.5);
219      glNormal3f(cos(angle), sin(angle), 0.0);
220   }
221
222   glVertex3f(r1 * cos(0), r1 * sin(0), width * 0.5);
223   glVertex3f(r1 * cos(0), r1 * sin(0), -width * 0.5);
224
225   glEnd();
226
227   glShadeModel(GL_SMOOTH);
228
229   /* draw inside radius cylinder */
230   glBegin(GL_QUAD_STRIP);
231   for (i = 0; i <= teeth; i++) {
232      angle = i * 2.0 * M_PI / teeth;
233      glNormal3f(-cos(angle), -sin(angle), 0.0);
234      glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
235      glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
236   }
237   glEnd();
238}
239
240
241static void
242draw(void)
243{
244   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
245
246   glPushMatrix();
247   glRotatef(view_rotx, 1.0, 0.0, 0.0);
248   glRotatef(view_roty, 0.0, 1.0, 0.0);
249   glRotatef(view_rotz, 0.0, 0.0, 1.0);
250
251   glPushMatrix();
252   glTranslatef(-3.0, -2.0, 0.0);
253   glRotatef(angle, 0.0, 0.0, 1.0);
254   glCallList(gear1);
255   glPopMatrix();
256
257   glPushMatrix();
258   glTranslatef(3.1, -2.0, 0.0);
259   glRotatef(-2.0 * angle - 9.0, 0.0, 0.0, 1.0);
260   glCallList(gear2);
261   glPopMatrix();
262
263   glPushMatrix();
264   glTranslatef(-3.1, 4.2, 0.0);
265   glRotatef(-2.0 * angle - 25.0, 0.0, 0.0, 1.0);
266   glCallList(gear3);
267   glPopMatrix();
268
269   glPopMatrix();
270}
271
272
273/* new window size or exposure */
274static void
275reshape(int width, int height)
276{
277   GLfloat h = (GLfloat) height / (GLfloat) width;
278
279   glViewport(0, 0, (GLint) width, (GLint) height);
280
281   glMatrixMode(GL_PROJECTION);
282   glLoadIdentity();
283   glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0);
284
285   glMatrixMode(GL_MODELVIEW);
286   glLoadIdentity();
287   glTranslatef(0.0, 0.0, -40.0);
288}
289
290
291
292static void
293init(void)
294{
295   static GLfloat pos[4] = { 5.0, 5.0, 10.0, 0.0 };
296   static GLfloat red[4] = { 0.8, 0.1, 0.0, 1.0 };
297   static GLfloat green[4] = { 0.0, 0.8, 0.2, 1.0 };
298   static GLfloat blue[4] = { 0.2, 0.2, 1.0, 1.0 };
299
300   glLightfv(GL_LIGHT0, GL_POSITION, pos);
301   glEnable(GL_CULL_FACE);
302   glEnable(GL_LIGHTING);
303   glEnable(GL_LIGHT0);
304   glEnable(GL_DEPTH_TEST);
305
306   /* make the gears */
307   gear1 = glGenLists(1);
308   glNewList(gear1, GL_COMPILE);
309   glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
310   gear(1.0, 4.0, 1.0, 20, 0.7);
311   glEndList();
312
313   gear2 = glGenLists(1);
314   glNewList(gear2, GL_COMPILE);
315   glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
316   gear(0.5, 2.0, 2.0, 10, 0.7);
317   glEndList();
318
319   gear3 = glGenLists(1);
320   glNewList(gear3, GL_COMPILE);
321   glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
322   gear(1.3, 2.0, 0.5, 10, 0.7);
323   glEndList();
324
325   glEnable(GL_NORMALIZE);
326}
327
328
329
330
331static void run_gears(EGLDisplay dpy, EGLSurface surf, int ttr)
332{
333	double st = current_time();
334	double ct = st;
335	int frames = 0;
336	GLfloat seconds, fps;
337
338	while (ct - st < ttr)
339	{
340		double tt = current_time();
341		double dt = tt - ct;
342		ct = tt;
343
344		/* advance rotation for next frame */
345		angle += 70.0 * dt;  /* 70 degrees per second */
346		if (angle > 3600.0)
347			angle -= 3600.0;
348
349		draw();
350
351		eglSwapBuffers(dpy, surf);
352
353
354		frames++;
355	}
356
357	seconds = ct - st;
358	fps = frames / seconds;
359	printf("%d frames in %3.1f seconds = %6.3f FPS\n", frames, seconds, fps);
360	fflush(stdout);
361
362}
363
364
365int
366main(int argc, char *argv[])
367{
368	int major, minor;
369	EGLContext ctx;
370	EGLSurface surface;
371	EGLConfig configs[MAX_CONFIGS];
372	EGLint numConfigs, i;
373	EGLBoolean b;
374	EGLDisplay d;
375	EGLint configAttribs[10];
376	EGLint screenAttribs[10];
377	GLboolean printInfo = GL_FALSE;
378	EGLint width = 300, height = 300;
379
380        /* parse cmd line args */
381	for (i = 1; i < argc; i++)
382	{
383		if (strcmp(argv[i], "-info") == 0)
384		{
385			printInfo = GL_TRUE;
386		}
387		else
388			printf("Warning: unknown parameter: %s\n", argv[i]);
389	}
390
391	/* DBR : Create EGL context/surface etc */
392	d = eglGetDisplay(EGL_DEFAULT_DISPLAY);
393	assert(d);
394
395	if (!eglInitialize(d, &major, &minor)) {
396		printf("peglgears: eglInitialize failed\n");
397		return 0;
398	}
399
400	printf("peglgears: EGL version = %d.%d\n", major, minor);
401	printf("peglgears: EGL_VENDOR = %s\n", eglQueryString(d, EGL_VENDOR));
402
403	i = 0;
404	configAttribs[i++] = EGL_RENDERABLE_TYPE;
405	configAttribs[i++] = EGL_OPENGL_BIT;
406	configAttribs[i++] = EGL_SURFACE_TYPE;
407	configAttribs[i++] = EGL_PBUFFER_BIT;
408	configAttribs[i++] = EGL_NONE;
409
410	numConfigs = 0;
411	if (!eglChooseConfig(d, configAttribs, configs, MAX_CONFIGS, &numConfigs) ||
412	    !numConfigs) {
413		printf("peglgears: failed to choose a config\n");
414		return 0;
415	}
416
417	eglBindAPI(EGL_OPENGL_API);
418
419	ctx = eglCreateContext(d, configs[0], EGL_NO_CONTEXT, NULL);
420	if (ctx == EGL_NO_CONTEXT) {
421		printf("peglgears: failed to create context\n");
422		return 0;
423	}
424
425	/* build up screenAttribs array */
426	i = 0;
427	screenAttribs[i++] = EGL_WIDTH;
428	screenAttribs[i++] = width;
429	screenAttribs[i++] = EGL_HEIGHT;
430	screenAttribs[i++] = height;
431	screenAttribs[i++] = EGL_NONE;
432
433	surface = eglCreatePbufferSurface(d, configs[0], screenAttribs);
434	if (surface == EGL_NO_SURFACE) {
435		printf("peglgears: failed to create pbuffer surface\n");
436		return 0;
437	}
438
439	b = eglMakeCurrent(d, surface, surface, ctx);
440	if (!b) {
441		printf("peglgears: make current failed\n");
442		return 0;
443	}
444
445	if (printInfo)
446	{
447		printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
448		printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
449		printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
450		printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
451	}
452
453	init();
454	reshape(width, height);
455
456	glDrawBuffer( GL_BACK );
457
458	run_gears(d, surface, 5.0);
459
460	eglDestroySurface(d, surface);
461	eglDestroyContext(d, ctx);
462	eglTerminate(d);
463
464	return 0;
465}
466