weston/clients/gears.c

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/*
* 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.
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*/
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#include "config.h"
#include <stdint.h>
#include <stdio.h>
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#include <stdlib.h>
#include <string.h>
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#include <math.h>
#include <time.h>
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#include <GL/gl.h>
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#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <linux/input.h>
#include <wayland-client.h>
#include "window.h"
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struct gears {
struct window *window;
struct widget *widget;
struct display *d;
EGLDisplay display;
EGLDisplay config;
EGLContext context;
GLfloat angle;
struct {
GLfloat rotx;
GLfloat roty;
} view;
int button_down;
int last_x, last_y;
GLint gear_list[3];
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int fullscreen;
int frames;
uint32_t last_fps;
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};
struct gear_template {
GLfloat material[4];
GLfloat inner_radius;
GLfloat outer_radius;
GLfloat width;
GLint teeth;
GLfloat tooth_depth;
};
static const 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);
}
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static void
make_gear(const struct gear_template *t)
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{
GLint i;
GLfloat r0, r1, r2;
GLfloat angle, da;
GLfloat u, v, len;
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, t->material);
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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;
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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);
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}
}
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);
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}
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);
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}
}
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);
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}
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;
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glVertex3f(r1 * cos(angle), r1 * sin(angle), t->width * 0.5);
glVertex3f(r1 * cos(angle), r1 * sin(angle), -t->width * 0.5);
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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);
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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);
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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);
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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);
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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;
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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);
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}
glEnd();
}
static void
update_fps(struct gears *gears, uint32_t time)
{
long diff_ms;
gears->frames++;
diff_ms = time - gears->last_fps;
if (diff_ms > 5000) {
float seconds = diff_ms / 1000.0;
float fps = gears->frames / seconds;
printf("%d frames in %6.3f seconds = %6.3f FPS\n", gears->frames, seconds, fps);
fflush(stdout);
gears->frames = 0;
gears->last_fps = time;
}
}
static void
frame_callback(void *data, struct wl_callback *callback, uint32_t time)
{
struct gears *gears = data;
update_fps(gears, time);
gears->angle = (GLfloat) (time % 8192) * 360 / 8192.0;
window_schedule_redraw(gears->window);
if (callback)
wl_callback_destroy(callback);
}
static const struct wl_callback_listener listener = {
frame_callback
};
static int
motion_handler(struct widget *widget, struct input *input,
uint32_t time, float x, float y, void *data)
{
struct gears *gears = data;
int offset_x, offset_y;
float step = 0.5;
if (gears->button_down) {
offset_x = x - gears->last_x;
offset_y = y - gears->last_y;
gears->last_x = x;
gears->last_y = y;
gears->view.roty += offset_x * step;
gears->view.rotx += offset_y * step;
if (gears->view.roty >= 360)
gears->view.roty = gears->view.roty - 360;
if (gears->view.roty <= 0)
gears->view.roty = gears->view.roty + 360;
if (gears->view.rotx >= 360)
gears->view.rotx = gears->view.rotx - 360;
if (gears->view.rotx <= 0)
gears->view.rotx = gears->view.rotx + 360;
}
return CURSOR_LEFT_PTR;
}
static void
button_handler(struct widget *widget, struct input *input,
uint32_t time, uint32_t button,
enum wl_pointer_button_state state, void *data)
{
struct gears *gears = data;
if (button == BTN_LEFT) {
if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
gears->button_down = 1;
input_get_position(input,
&gears->last_x, &gears->last_y);
} else {
gears->button_down = 0;
}
}
}
static void
redraw_handler(struct widget *widget, void *data)
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{
struct rectangle window_allocation;
struct rectangle allocation;
struct wl_callback *callback;
struct gears *gears = data;
widget_get_allocation(gears->widget, &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.y,
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);
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glPushMatrix();
glTranslatef(0.0, 0.0, -50);
glRotatef(gears->view.rotx, 1.0, 0.0, 0.0);
glRotatef(gears->view.roty, 0.0, 1.0, 0.0);
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glPushMatrix();
glTranslatef(-3.0, -2.0, 0.0);
glRotatef(gears->angle, 0.0, 0.0, 1.0);
glCallList(gears->gear_list[0]);
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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]);
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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]);
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glPopMatrix();
glPopMatrix();
glFlush();
display_release_window_surface(gears->d, gears->window);
callback = wl_surface_frame(window_get_wl_surface(gears->window));
wl_callback_add_listener(callback, &listener, gears);
}
static void
resize_handler(struct widget *widget,
int32_t width, int32_t height, void *data)
{
struct gears *gears = data;
int32_t size, big, small;
/* Constrain child size to be square and at least 300x300 */
if (width < height) {
small = width;
big = height;
} else {
small = height;
big = width;
}
if (gears->fullscreen)
size = small;
else
size = big;
widget_set_size(gears->widget, size, size);
}
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static void
keyboard_focus_handler(struct window *window,
struct input *device, void *data)
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{
window_schedule_redraw(window);
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}
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static void
fullscreen_handler(struct window *window, void *data)
{
struct gears *gears = data;
gears->fullscreen ^= 1;
window_set_fullscreen(window, gears->fullscreen);
}
static struct gears *
gears_create(struct display *display)
{
const int width = 450, height = 500;
struct gears *gears;
struct timeval tv;
int i;
gears = malloc(sizeof *gears);
memset(gears, 0, sizeof *gears);
gears->d = display;
gears->window = window_create(display);
gears->widget = frame_create(gears->window, gears);
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");
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eglBindAPI(EGL_OPENGL_API);
gears->config = display_get_argb_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");
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if (!eglMakeCurrent(gears->display, NULL, NULL, gears->context))
die("failed to make context current\n");
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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();
}
gears->button_down = 0;
gears->last_x = 0;
gears->last_y = 0;
gears->view.rotx = 20.0;
gears->view.roty = 30.0;
gettimeofday(&tv, NULL);
gears->last_fps = tv.tv_sec * 1000 + tv.tv_usec / 1000;
printf("Warning: FPS count is limited by the wayland compositor or monitor refresh rate\n");
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);
widget_set_resize_handler(gears->widget, resize_handler);
widget_set_redraw_handler(gears->widget, redraw_handler);
widget_set_button_handler(gears->widget, button_handler);
widget_set_motion_handler(gears->widget, motion_handler);
window_set_keyboard_focus_handler(gears->window,
keyboard_focus_handler);
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window_set_fullscreen_handler(gears->window, fullscreen_handler);
window_schedule_resize(gears->window, width, height);
return gears;
}
int main(int argc, char *argv[])
{
struct display *d;
d = display_create(argc, argv);
if (d == NULL) {
fprintf(stderr, "failed to create display: %m\n");
return -1;
}
gears_create(d);
display_run(d);
return 0;
}