clients/gears.c - chromiumos/third_party/wayland-demos - Git at Google

 /*
  * Copyright © 2008 Kristian Høgsberg
  *
  * Permission to use, copy, modify, distribute, and sell this software and its
  * documentation for any purpose is hereby granted without fee, provided that
  * the above copyright notice appear in all copies and that both that copyright
  * notice and this permission notice appear in supporting documentation, and
  * that the name of the copyright holders not be used in advertising or
  * publicity pertaining to distribution of the software without specific,
  * written prior permission.  The copyright holders make no representations
  * about the suitability of this software for any purpose.  It is provided "as
  * is" without express or implied warranty.
  *
  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  * OF THIS SOFTWARE.
  */

 #include "config.h"

 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <math.h>
 #include <time.h>
 #include <glib.h>

 #include <GL/gl.h>
 #include <EGL/egl.h>
 #include <EGL/eglext.h>

 #include <wayland-client.h>

 #include "window.h"

 struct gears {
 	struct window *window;

 	struct display *d;

 	EGLDisplay display;
 	EGLDisplay config;
 	EGLContext context;
 	GLfloat angle;

 	GLint gear_list[3];
 };

 struct gear_template {
 	GLfloat material[4];
 	GLfloat inner_radius;
 	GLfloat outer_radius;
 	GLfloat width;
 	GLint teeth;
 	GLfloat tooth_depth;
 };

 const static struct gear_template gear_templates[] = {
 	{ { 0.8, 0.1, 0.0, 1.0 }, 1.0, 4.0, 1.0, 20, 0.7 },
 	{ { 0.0, 0.8, 0.2, 1.0 }, 0.5, 2.0, 2.0, 10, 0.7 },
 	{ { 0.2, 0.2, 1.0, 1.0 }, 1.3, 2.0, 0.5, 10, 0.7 },
 };

 static GLfloat light_pos[4] = {5.0, 5.0, 10.0, 0.0};

 static void die(const char *msg)
 {
 	fprintf(stderr, "%s", msg);
 	exit(EXIT_FAILURE);
 }

 static void
 make_gear(const struct gear_template *t)
 {
 	GLint i;
 	GLfloat r0, r1, r2;
 	GLfloat angle, da;
 	GLfloat u, v, len;

 	glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, t->material);

 	r0 = t->inner_radius;
 	r1 = t->outer_radius - t->tooth_depth / 2.0;
 	r2 = t->outer_radius + t->tooth_depth / 2.0;

 	da = 2.0 * M_PI / t->teeth / 4.0;

 	glShadeModel(GL_FLAT);

 	glNormal3f(0.0, 0.0, 1.0);

 	/* draw front face */
 	glBegin(GL_QUAD_STRIP);
 	for (i = 0; i <= t->teeth; i++) {
 		angle = i * 2.0 * M_PI / t->teeth;
 		glVertex3f(r0 * cos(angle), r0 * sin(angle), t->width * 0.5);
 		glVertex3f(r1 * cos(angle), r1 * sin(angle), t->width * 0.5);
 		if (i < t->teeth) {
 			glVertex3f(r0 * cos(angle), r0 * sin(angle), t->width * 0.5);
 			glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), t->width * 0.5);
 		}
 	}
 	glEnd();

 	/* draw front sides of teeth */
 	glBegin(GL_QUADS);
 	da = 2.0 * M_PI / t->teeth / 4.0;
 	for (i = 0; i < t->teeth; i++) {
 		angle = i * 2.0 * M_PI / t->teeth;

 		glVertex3f(r1 * cos(angle), r1 * sin(angle), t->width * 0.5);
 		glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), t->width * 0.5);
 		glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), t->width * 0.5);
 		glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), t->width * 0.5);
 	}
 	glEnd();

 	glNormal3f(0.0, 0.0, -1.0);

 	/* draw back face */
 	glBegin(GL_QUAD_STRIP);
 	for (i = 0; i <= t->teeth; i++) {
 		angle = i * 2.0 * M_PI / t->teeth;
 		glVertex3f(r1 * cos(angle), r1 * sin(angle), -t->width * 0.5);
 		glVertex3f(r0 * cos(angle), r0 * sin(angle), -t->width * 0.5);
 		if (i < t->teeth) {
 			glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -t->width * 0.5);
 			glVertex3f(r0 * cos(angle), r0 * sin(angle), -t->width * 0.5);
 		}
 	}
 	glEnd();

 	/* draw back sides of teeth */
 	glBegin(GL_QUADS);
 	da = 2.0 * M_PI / t->teeth / 4.0;
 	for (i = 0; i < t->teeth; i++) {
 		angle = i * 2.0 * M_PI / t->teeth;

 		glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -t->width * 0.5);
 		glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -t->width * 0.5);
 		glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -t->width * 0.5);
 		glVertex3f(r1 * cos(angle), r1 * sin(angle), -t->width * 0.5);
 	}
 	glEnd();

 	/* draw outward faces of teeth */
 	glBegin(GL_QUAD_STRIP);
 	for (i = 0; i < t->teeth; i++) {
 		angle = i * 2.0 * M_PI / t->teeth;

 		glVertex3f(r1 * cos(angle), r1 * sin(angle), t->width * 0.5);
 		glVertex3f(r1 * cos(angle), r1 * sin(angle), -t->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), t->width * 0.5);
 		glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -t->width * 0.5);
 		glNormal3f(cos(angle), sin(angle), 0.0);
 		glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), t->width * 0.5);
 		glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -t->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), t->width * 0.5);
 		glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -t->width * 0.5);
 		glNormal3f(cos(angle), sin(angle), 0.0);
 	}

 	glVertex3f(r1 * cos(0), r1 * sin(0), t->width * 0.5);
 	glVertex3f(r1 * cos(0), r1 * sin(0), -t->width * 0.5);

 	glEnd();

 	glShadeModel(GL_SMOOTH);

 	/* draw inside radius cylinder */
 	glBegin(GL_QUAD_STRIP);
 	for (i = 0; i <= t->teeth; i++) {
 		angle = i * 2.0 * M_PI / t->teeth;
 		glNormal3f(-cos(angle), -sin(angle), 0.0);
 		glVertex3f(r0 * cos(angle), r0 * sin(angle), -t->width * 0.5);
 		glVertex3f(r0 * cos(angle), r0 * sin(angle), t->width * 0.5);
 	}
 	glEnd();
 }

 static void
 draw_gears(struct gears *gears)
 {
 	GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
 	struct rectangle window_allocation;
 	struct rectangle allocation;

 	window_draw(gears->window);

 	window_get_child_allocation(gears->window, &allocation);
 	window_get_allocation(gears->window, &window_allocation);

 	if (display_acquire_window_surface(gears->d,
 					    gears->window,
 					    gears->context) < 0) {
 		die("Unable to acquire window surface, "
 		    "compiled without cairo-egl?\n");
 	}

 	glViewport(allocation.x,
 		   window_allocation.height - allocation.height - allocation.x,
 		   allocation.width, allocation.height);
 	glScissor(allocation.x,
 		  window_allocation.height - allocation.height - allocation.y,
 		  allocation.width, allocation.height);

 	glEnable(GL_SCISSOR_TEST);
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

 	glPushMatrix();

 	glTranslatef(0.0, 0.0, -50);

 	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(gears->angle, 0.0, 0.0, 1.0);
 	glCallList(gears->gear_list[0]);
 	glPopMatrix();

 	glPushMatrix();
 	glTranslatef(3.1, -2.0, 0.0);
 	glRotatef(-2.0 * gears->angle - 9.0, 0.0, 0.0, 1.0);
 	glCallList(gears->gear_list[1]);
 	glPopMatrix();

 	glPushMatrix();
 	glTranslatef(-3.1, 4.2, 0.0);
 	glRotatef(-2.0 * gears->angle - 25.0, 0.0, 0.0, 1.0);
 	glCallList(gears->gear_list[2]);
 	glPopMatrix();

 	glPopMatrix();

 	glFlush();

 	display_release_window_surface(gears->d, gears->window);
 	window_flush(gears->window);
 }

 static void
 resize_handler(struct window *window,
 	       int32_t width, int32_t height, void *data)
 {
 	struct gears *gears = data;

 	/* Constrain child size to be square and at least 300x300 */
 	if (width > height)
 		height = width;
 	else
 		width = height;
 	if (width < 300) {
 		width = 300;
 		height = 300;
 	}

 	window_set_child_size(gears->window, width, height);
 }

 static void
 keyboard_focus_handler(struct window *window,
 		       struct input *device, void *data)
 {
 	struct gears *gears = data;
 	struct rectangle allocation;

 	window_get_child_allocation(gears->window, &allocation);
 	resize_handler(window, allocation.width, allocation.height, gears);
 }

 static void
 frame_callback(void *data, struct wl_callback *callback, uint32_t time)
 {
 	static const struct wl_callback_listener listener = {
 		frame_callback
 	};
 	struct gears *gears = data;

 	gears->angle = (GLfloat) (time % 8192) * 360 / 8192.0;

 	draw_gears(gears);

 	if (callback)
 		wl_callback_destroy(callback);

 	callback = wl_surface_frame(window_get_wl_surface(gears->window));
 	wl_callback_add_listener(callback, &listener, gears);
 }

 static struct gears *
 gears_create(struct display *display)
 {
 	const int width = 450, height = 500;
 	struct gears *gears;
 	int i;

 	gears = malloc(sizeof *gears);
 	memset(gears, 0, sizeof *gears);
 	gears->d = display;
 	gears->window = window_create(display, width, height);
 	window_set_transparent(gears->window, 0);
 	window_set_title(gears->window, "Wayland Gears");

 	gears->display = display_get_egl_display(gears->d);
 	if (gears->display == NULL)
 		die("failed to create egl display\n");

 	eglBindAPI(EGL_OPENGL_API);

 	gears->config = display_get_rgb_egl_config(gears->d);

 	gears->context = eglCreateContext(gears->display, gears->config,
 					  EGL_NO_CONTEXT, NULL);
 	if (gears->context == NULL)
 		die("failed to create context\n");

 	if (!eglMakeCurrent(gears->display, NULL, NULL, gears->context))
 		die("faile to make context current\n");

 	for (i = 0; i < 3; i++) {
 		gears->gear_list[i] = glGenLists(1);
 		glNewList(gears->gear_list[i], GL_COMPILE);
 		make_gear(&gear_templates[i]);
 		glEndList();
 	}

 	glEnable(GL_NORMALIZE);

 	glMatrixMode(GL_PROJECTION);
 	glLoadIdentity();
 	glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 200.0);
 	glMatrixMode(GL_MODELVIEW);

 	glLightfv(GL_LIGHT0, GL_POSITION, light_pos);
 	glEnable(GL_CULL_FACE);
 	glEnable(GL_LIGHTING);
 	glEnable(GL_LIGHT0);
 	glEnable(GL_DEPTH_TEST);
 	glClearColor(0, 0, 0, 0.92);

 	window_set_user_data(gears->window, gears);
 	window_set_resize_handler(gears->window, resize_handler);
 	window_set_keyboard_focus_handler(gears->window, keyboard_focus_handler);

 	frame_callback(gears, NULL, 0);

 	return gears;
 }

 int main(int argc, char *argv[])
 {
 	struct display *d;

 	d = display_create(&argc, &argv, NULL);
 	if (d == NULL) {
 		fprintf(stderr, "failed to create display: %m\n");
 		return -1;
 	}
 	gears_create(d);
 	display_run(d);

 	return 0;
 }
	/*
	* Copyright © 2008 Kristian Høgsberg
	*
	* Permission to use, copy, modify, distribute, and sell this software and its
	* documentation for any purpose is hereby granted without fee, provided that
	* the above copyright notice appear in all copies and that both that copyright
	* notice and this permission notice appear in supporting documentation, and
	* that the name of the copyright holders not be used in advertising or
	* publicity pertaining to distribution of the software without specific,
	* written prior permission. The copyright holders make no representations
	* about the suitability of this software for any purpose. It is provided "as
	* is" without express or implied warranty.
	*
	* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
	* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
	* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
	* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
	* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
	* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	* OF THIS SOFTWARE.
	*/

	#include "config.h"

	#include <stdint.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <fcntl.h>
	#include <unistd.h>
	#include <math.h>
	#include <time.h>
	#include <glib.h>

	#include <GL/gl.h>
	#include <EGL/egl.h>
	#include <EGL/eglext.h>

	#include <wayland-client.h>

	#include "window.h"

	struct gears {
	struct window *window;

	struct display *d;

	EGLDisplay display;
	EGLDisplay config;
	EGLContext context;
	GLfloat angle;

	GLint gear_list[3];
	};

	struct gear_template {
	GLfloat material[4];
	GLfloat inner_radius;
	GLfloat outer_radius;
	GLfloat width;
	GLint teeth;
	GLfloat tooth_depth;
	};

	const static struct gear_template gear_templates[] = {
	{ { 0.8, 0.1, 0.0, 1.0 }, 1.0, 4.0, 1.0, 20, 0.7 },
	{ { 0.0, 0.8, 0.2, 1.0 }, 0.5, 2.0, 2.0, 10, 0.7 },
	{ { 0.2, 0.2, 1.0, 1.0 }, 1.3, 2.0, 0.5, 10, 0.7 },
	};

	static GLfloat light_pos[4] = {5.0, 5.0, 10.0, 0.0};

	static void die(const char *msg)
	{
	fprintf(stderr, "%s", msg);
	exit(EXIT_FAILURE);
	}

	static void
	make_gear(const struct gear_template *t)
	{
	GLint i;
	GLfloat r0, r1, r2;
	GLfloat angle, da;
	GLfloat u, v, len;

	glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, t->material);

	r0 = t->inner_radius;
	r1 = t->outer_radius - t->tooth_depth / 2.0;
	r2 = t->outer_radius + t->tooth_depth / 2.0;

	da = 2.0 * M_PI / t->teeth / 4.0;

	glShadeModel(GL_FLAT);

	glNormal3f(0.0, 0.0, 1.0);

	/* draw front face */
	glBegin(GL_QUAD_STRIP);
	for (i = 0; i <= t->teeth; i++) {
	angle = i * 2.0 * M_PI / t->teeth;
	glVertex3f(r0 * cos(angle), r0 * sin(angle), t->width * 0.5);
	glVertex3f(r1 * cos(angle), r1 * sin(angle), t->width * 0.5);
	if (i < t->teeth) {
	glVertex3f(r0 * cos(angle), r0 * sin(angle), t->width * 0.5);
	glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), t->width * 0.5);
	}
	}
	glEnd();

	/* draw front sides of teeth */
	glBegin(GL_QUADS);
	da = 2.0 * M_PI / t->teeth / 4.0;
	for (i = 0; i < t->teeth; i++) {
	angle = i * 2.0 * M_PI / t->teeth;

	glVertex3f(r1 * cos(angle), r1 * sin(angle), t->width * 0.5);
	glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), t->width * 0.5);
	glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), t->width * 0.5);
	glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), t->width * 0.5);
	}
	glEnd();

	glNormal3f(0.0, 0.0, -1.0);

	/* draw back face */
	glBegin(GL_QUAD_STRIP);
	for (i = 0; i <= t->teeth; i++) {
	angle = i * 2.0 * M_PI / t->teeth;
	glVertex3f(r1 * cos(angle), r1 * sin(angle), -t->width * 0.5);
	glVertex3f(r0 * cos(angle), r0 * sin(angle), -t->width * 0.5);
	if (i < t->teeth) {
	glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -t->width * 0.5);
	glVertex3f(r0 * cos(angle), r0 * sin(angle), -t->width * 0.5);
	}
	}
	glEnd();

	/* draw back sides of teeth */
	glBegin(GL_QUADS);
	da = 2.0 * M_PI / t->teeth / 4.0;
	for (i = 0; i < t->teeth; i++) {
	angle = i * 2.0 * M_PI / t->teeth;

	glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -t->width * 0.5);
	glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -t->width * 0.5);
	glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -t->width * 0.5);
	glVertex3f(r1 * cos(angle), r1 * sin(angle), -t->width * 0.5);
	}
	glEnd();

	/* draw outward faces of teeth */
	glBegin(GL_QUAD_STRIP);
	for (i = 0; i < t->teeth; i++) {
	angle = i * 2.0 * M_PI / t->teeth;

	glVertex3f(r1 * cos(angle), r1 * sin(angle), t->width * 0.5);
	glVertex3f(r1 * cos(angle), r1 * sin(angle), -t->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), t->width * 0.5);
	glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -t->width * 0.5);
	glNormal3f(cos(angle), sin(angle), 0.0);
	glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), t->width * 0.5);
	glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -t->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), t->width * 0.5);
	glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -t->width * 0.5);
	glNormal3f(cos(angle), sin(angle), 0.0);
	}

	glVertex3f(r1 * cos(0), r1 * sin(0), t->width * 0.5);
	glVertex3f(r1 * cos(0), r1 * sin(0), -t->width * 0.5);

	glEnd();

	glShadeModel(GL_SMOOTH);

	/* draw inside radius cylinder */
	glBegin(GL_QUAD_STRIP);
	for (i = 0; i <= t->teeth; i++) {
	angle = i * 2.0 * M_PI / t->teeth;
	glNormal3f(-cos(angle), -sin(angle), 0.0);
	glVertex3f(r0 * cos(angle), r0 * sin(angle), -t->width * 0.5);
	glVertex3f(r0 * cos(angle), r0 * sin(angle), t->width * 0.5);
	}
	glEnd();
	}

	static void
	draw_gears(struct gears *gears)
	{
	GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
	struct rectangle window_allocation;
	struct rectangle allocation;

	window_draw(gears->window);

	window_get_child_allocation(gears->window, &allocation);
	window_get_allocation(gears->window, &window_allocation);

	if (display_acquire_window_surface(gears->d,
	gears->window,
	gears->context) < 0) {
	die("Unable to acquire window surface, "
	"compiled without cairo-egl?\n");
	}

	glViewport(allocation.x,
	window_allocation.height - allocation.height - allocation.x,
	allocation.width, allocation.height);
	glScissor(allocation.x,
	window_allocation.height - allocation.height - allocation.y,
	allocation.width, allocation.height);

	glEnable(GL_SCISSOR_TEST);
	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);

	glPushMatrix();

	glTranslatef(0.0, 0.0, -50);

	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(gears->angle, 0.0, 0.0, 1.0);
	glCallList(gears->gear_list[0]);
	glPopMatrix();

	glPushMatrix();
	glTranslatef(3.1, -2.0, 0.0);
	glRotatef(-2.0 * gears->angle - 9.0, 0.0, 0.0, 1.0);
	glCallList(gears->gear_list[1]);
	glPopMatrix();

	glPushMatrix();
	glTranslatef(-3.1, 4.2, 0.0);
	glRotatef(-2.0 * gears->angle - 25.0, 0.0, 0.0, 1.0);
	glCallList(gears->gear_list[2]);
	glPopMatrix();

	glPopMatrix();

	glFlush();

	display_release_window_surface(gears->d, gears->window);
	window_flush(gears->window);
	}

	static void
	resize_handler(struct window *window,
	int32_t width, int32_t height, void *data)
	{
	struct gears *gears = data;

	/* Constrain child size to be square and at least 300x300 */
	if (width > height)
	height = width;
	else
	width = height;
	if (width < 300) {
	width = 300;
	height = 300;
	}

	window_set_child_size(gears->window, width, height);
	}

	static void
	keyboard_focus_handler(struct window *window,
	struct input device, void data)
	{
	struct gears *gears = data;
	struct rectangle allocation;

	window_get_child_allocation(gears->window, &allocation);
	resize_handler(window, allocation.width, allocation.height, gears);
	}

	static void
	frame_callback(void data, struct wl_callback callback, uint32_t time)
	{
	static const struct wl_callback_listener listener = {
	frame_callback
	};
	struct gears *gears = data;

	gears->angle = (GLfloat) (time % 8192) * 360 / 8192.0;

	draw_gears(gears);

	if (callback)
	wl_callback_destroy(callback);

	callback = wl_surface_frame(window_get_wl_surface(gears->window));
	wl_callback_add_listener(callback, &listener, gears);
	}

	static struct gears *
	gears_create(struct display *display)
	{
	const int width = 450, height = 500;
	struct gears *gears;
	int i;

	gears = malloc(sizeof *gears);
	memset(gears, 0, sizeof *gears);
	gears->d = display;
	gears->window = window_create(display, width, height);
	window_set_transparent(gears->window, 0);
	window_set_title(gears->window, "Wayland Gears");

	gears->display = display_get_egl_display(gears->d);
	if (gears->display == NULL)
	die("failed to create egl display\n");

	eglBindAPI(EGL_OPENGL_API);

	gears->config = display_get_rgb_egl_config(gears->d);

	gears->context = eglCreateContext(gears->display, gears->config,
	EGL_NO_CONTEXT, NULL);
	if (gears->context == NULL)
	die("failed to create context\n");

	if (!eglMakeCurrent(gears->display, NULL, NULL, gears->context))
	die("faile to make context current\n");

	for (i = 0; i < 3; i++) {
	gears->gear_list[i] = glGenLists(1);
	glNewList(gears->gear_list[i], GL_COMPILE);
	make_gear(&gear_templates[i]);
	glEndList();
	}

	glEnable(GL_NORMALIZE);

	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 200.0);
	glMatrixMode(GL_MODELVIEW);

	glLightfv(GL_LIGHT0, GL_POSITION, light_pos);
	glEnable(GL_CULL_FACE);
	glEnable(GL_LIGHTING);
	glEnable(GL_LIGHT0);
	glEnable(GL_DEPTH_TEST);
	glClearColor(0, 0, 0, 0.92);

	window_set_user_data(gears->window, gears);
	window_set_resize_handler(gears->window, resize_handler);
	window_set_keyboard_focus_handler(gears->window, keyboard_focus_handler);

	frame_callback(gears, NULL, 0);

	return gears;
	}

	int main(int argc, char *argv[])
	{
	struct display *d;

	d = display_create(&argc, &argv, NULL);
	if (d == NULL) {
	fprintf(stderr, "failed to create display: %m\n");
	return -1;
	}
	gears_create(d);
	display_run(d);

	return 0;
	}