452 lines
11 KiB
C
452 lines
11 KiB
C
/*
|
|
* Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included
|
|
* in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
|
|
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
|
|
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
/*
|
|
* This is a port of the infamous "glxgears" demo to straight EGL
|
|
* Port by Dane Rushton 10 July 2005
|
|
*
|
|
* No command line options.
|
|
* Program runs for 5 seconds then exits, outputing framerate to console
|
|
*/
|
|
|
|
#define EGL_EGLEXT_PROTOTYPES
|
|
|
|
#include <assert.h>
|
|
#include <math.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <GL/gl.h>
|
|
#include <EGL/egl.h>
|
|
#include <EGL/eglext.h>
|
|
|
|
#define MAX_CONFIGS 10
|
|
#define MAX_MODES 100
|
|
|
|
#define BENCHMARK
|
|
|
|
#ifdef BENCHMARK
|
|
|
|
/* XXX this probably isn't very portable */
|
|
|
|
#include <sys/time.h>
|
|
#include <unistd.h>
|
|
|
|
/* return current time (in seconds) */
|
|
static double
|
|
current_time(void)
|
|
{
|
|
struct timeval tv;
|
|
#ifdef __VMS
|
|
(void) gettimeofday(&tv, NULL );
|
|
#else
|
|
struct timezone tz;
|
|
(void) gettimeofday(&tv, &tz);
|
|
#endif
|
|
return (double) tv.tv_sec + tv.tv_usec / 1000000.0;
|
|
}
|
|
|
|
#else /*BENCHMARK*/
|
|
|
|
/* dummy */
|
|
static double
|
|
current_time(void)
|
|
{
|
|
/* update this function for other platforms! */
|
|
static double t = 0.0;
|
|
static int warn = 1;
|
|
if (warn) {
|
|
fprintf(stderr, "Warning: current_time() not implemented!!\n");
|
|
warn = 0;
|
|
}
|
|
return t += 1.0;
|
|
}
|
|
|
|
#endif /*BENCHMARK*/
|
|
|
|
|
|
#ifndef M_PI
|
|
#define M_PI 3.14159265
|
|
#endif
|
|
|
|
|
|
static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
|
|
static GLint gear1, gear2, gear3;
|
|
static GLfloat angle = 0.0;
|
|
|
|
#if 0
|
|
static GLfloat eyesep = 5.0; /* Eye separation. */
|
|
static GLfloat fix_point = 40.0; /* Fixation point distance. */
|
|
static GLfloat left, right, asp; /* Stereo frustum params. */
|
|
#endif
|
|
|
|
|
|
/*
|
|
*
|
|
* Draw a gear wheel. You'll probably want to call this function when
|
|
* building a display list since we do a lot of trig here.
|
|
*
|
|
* Input: inner_radius - radius of hole at center
|
|
* outer_radius - radius at center of teeth
|
|
* width - width of gear
|
|
* teeth - number of teeth
|
|
* tooth_depth - depth of tooth
|
|
*/
|
|
static void
|
|
gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
|
|
GLint teeth, GLfloat tooth_depth)
|
|
{
|
|
GLint i;
|
|
GLfloat r0, r1, r2;
|
|
GLfloat angle, da;
|
|
GLfloat u, v, len;
|
|
|
|
r0 = inner_radius;
|
|
r1 = outer_radius - tooth_depth / 2.0;
|
|
r2 = outer_radius + tooth_depth / 2.0;
|
|
|
|
da = 2.0 * M_PI / teeth / 4.0;
|
|
|
|
glShadeModel(GL_FLAT);
|
|
|
|
glNormal3f(0.0, 0.0, 1.0);
|
|
|
|
/* draw front face */
|
|
glBegin(GL_QUAD_STRIP);
|
|
for (i = 0; i <= teeth; i++) {
|
|
angle = i * 2.0 * M_PI / teeth;
|
|
glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
|
|
glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
|
|
if (i < teeth) {
|
|
glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
|
|
glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
|
|
width * 0.5);
|
|
}
|
|
}
|
|
glEnd();
|
|
|
|
/* draw front sides of teeth */
|
|
glBegin(GL_QUADS);
|
|
da = 2.0 * M_PI / teeth / 4.0;
|
|
for (i = 0; i < teeth; i++) {
|
|
angle = i * 2.0 * M_PI / teeth;
|
|
|
|
glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
|
|
glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
|
|
glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
|
|
width * 0.5);
|
|
glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
|
|
width * 0.5);
|
|
}
|
|
glEnd();
|
|
|
|
glNormal3f(0.0, 0.0, -1.0);
|
|
|
|
/* draw back face */
|
|
glBegin(GL_QUAD_STRIP);
|
|
for (i = 0; i <= teeth; i++) {
|
|
angle = i * 2.0 * M_PI / teeth;
|
|
glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
|
|
glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
|
|
if (i < teeth) {
|
|
glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
|
|
-width * 0.5);
|
|
glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
|
|
}
|
|
}
|
|
glEnd();
|
|
|
|
/* draw back sides of teeth */
|
|
glBegin(GL_QUADS);
|
|
da = 2.0 * M_PI / teeth / 4.0;
|
|
for (i = 0; i < teeth; i++) {
|
|
angle = i * 2.0 * M_PI / teeth;
|
|
|
|
glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
|
|
-width * 0.5);
|
|
glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
|
|
-width * 0.5);
|
|
glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
|
|
glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
|
|
}
|
|
glEnd();
|
|
|
|
/* draw outward faces of teeth */
|
|
glBegin(GL_QUAD_STRIP);
|
|
for (i = 0; i < teeth; i++) {
|
|
angle = i * 2.0 * M_PI / teeth;
|
|
|
|
glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
|
|
glVertex3f(r1 * cos(angle), r1 * sin(angle), -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), width * 0.5);
|
|
glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
|
|
glNormal3f(cos(angle), sin(angle), 0.0);
|
|
glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
|
|
width * 0.5);
|
|
glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
|
|
-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),
|
|
width * 0.5);
|
|
glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
|
|
-width * 0.5);
|
|
glNormal3f(cos(angle), sin(angle), 0.0);
|
|
}
|
|
|
|
glVertex3f(r1 * cos(0), r1 * sin(0), width * 0.5);
|
|
glVertex3f(r1 * cos(0), r1 * sin(0), -width * 0.5);
|
|
|
|
glEnd();
|
|
|
|
glShadeModel(GL_SMOOTH);
|
|
|
|
/* draw inside radius cylinder */
|
|
glBegin(GL_QUAD_STRIP);
|
|
for (i = 0; i <= teeth; i++) {
|
|
angle = i * 2.0 * M_PI / teeth;
|
|
glNormal3f(-cos(angle), -sin(angle), 0.0);
|
|
glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
|
|
glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
|
|
}
|
|
glEnd();
|
|
}
|
|
|
|
|
|
static void
|
|
draw(void)
|
|
{
|
|
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
|
|
|
glPushMatrix();
|
|
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(angle, 0.0, 0.0, 1.0);
|
|
glCallList(gear1);
|
|
glPopMatrix();
|
|
|
|
glPushMatrix();
|
|
glTranslatef(3.1, -2.0, 0.0);
|
|
glRotatef(-2.0 * angle - 9.0, 0.0, 0.0, 1.0);
|
|
glCallList(gear2);
|
|
glPopMatrix();
|
|
|
|
glPushMatrix();
|
|
glTranslatef(-3.1, 4.2, 0.0);
|
|
glRotatef(-2.0 * angle - 25.0, 0.0, 0.0, 1.0);
|
|
glCallList(gear3);
|
|
glPopMatrix();
|
|
|
|
glPopMatrix();
|
|
}
|
|
|
|
|
|
/* new window size or exposure */
|
|
static void
|
|
reshape(int width, int height)
|
|
{
|
|
GLfloat h = (GLfloat) height / (GLfloat) width;
|
|
|
|
glViewport(0, 0, (GLint) width, (GLint) height);
|
|
|
|
glMatrixMode(GL_PROJECTION);
|
|
glLoadIdentity();
|
|
glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0);
|
|
|
|
glMatrixMode(GL_MODELVIEW);
|
|
glLoadIdentity();
|
|
glTranslatef(0.0, 0.0, -40.0);
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
init(void)
|
|
{
|
|
static GLfloat pos[4] = { 5.0, 5.0, 10.0, 0.0 };
|
|
static GLfloat red[4] = { 0.8, 0.1, 0.0, 1.0 };
|
|
static GLfloat green[4] = { 0.0, 0.8, 0.2, 1.0 };
|
|
static GLfloat blue[4] = { 0.2, 0.2, 1.0, 1.0 };
|
|
|
|
glLightfv(GL_LIGHT0, GL_POSITION, pos);
|
|
glEnable(GL_CULL_FACE);
|
|
glEnable(GL_LIGHTING);
|
|
glEnable(GL_LIGHT0);
|
|
glEnable(GL_DEPTH_TEST);
|
|
|
|
/* make the gears */
|
|
gear1 = glGenLists(1);
|
|
glNewList(gear1, GL_COMPILE);
|
|
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
|
|
gear(1.0, 4.0, 1.0, 20, 0.7);
|
|
glEndList();
|
|
|
|
gear2 = glGenLists(1);
|
|
glNewList(gear2, GL_COMPILE);
|
|
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
|
|
gear(0.5, 2.0, 2.0, 10, 0.7);
|
|
glEndList();
|
|
|
|
gear3 = glGenLists(1);
|
|
glNewList(gear3, GL_COMPILE);
|
|
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
|
|
gear(1.3, 2.0, 0.5, 10, 0.7);
|
|
glEndList();
|
|
|
|
glEnable(GL_NORMALIZE);
|
|
}
|
|
|
|
|
|
|
|
|
|
static void run_gears(EGLDisplay dpy, EGLSurface surf, int ttr)
|
|
{
|
|
double st = current_time();
|
|
double ct = st;
|
|
int frames = 0;
|
|
GLfloat seconds, fps;
|
|
|
|
while (ct - st < ttr)
|
|
{
|
|
double tt = current_time();
|
|
double dt = tt - ct;
|
|
ct = tt;
|
|
|
|
/* advance rotation for next frame */
|
|
angle += 70.0 * dt; /* 70 degrees per second */
|
|
if (angle > 3600.0)
|
|
angle -= 3600.0;
|
|
|
|
draw();
|
|
|
|
eglSwapBuffers(dpy, surf);
|
|
|
|
|
|
frames++;
|
|
}
|
|
|
|
seconds = ct - st;
|
|
fps = frames / seconds;
|
|
printf("%d frames in %3.1f seconds = %6.3f FPS\n", frames, seconds, fps);
|
|
|
|
}
|
|
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
int major, minor;
|
|
EGLContext ctx;
|
|
EGLSurface surface;
|
|
EGLConfig configs[MAX_CONFIGS];
|
|
EGLint numConfigs, i;
|
|
EGLBoolean b;
|
|
EGLDisplay d;
|
|
EGLint screenAttribs[10];
|
|
GLboolean printInfo = GL_FALSE;
|
|
EGLint width = 300, height = 300;
|
|
|
|
/* parse cmd line args */
|
|
for (i = 1; i < argc; i++)
|
|
{
|
|
if (strcmp(argv[i], "-info") == 0)
|
|
{
|
|
printInfo = GL_TRUE;
|
|
}
|
|
else
|
|
printf("Warning: unknown parameter: %s\n", argv[i]);
|
|
}
|
|
|
|
/* DBR : Create EGL context/surface etc */
|
|
d = eglGetDisplay(EGL_DEFAULT_DISPLAY);
|
|
assert(d);
|
|
|
|
if (!eglInitialize(d, &major, &minor)) {
|
|
printf("peglgears: eglInitialize failed\n");
|
|
return 0;
|
|
}
|
|
|
|
printf("peglgears: EGL version = %d.%d\n", major, minor);
|
|
printf("peglgears: EGL_VENDOR = %s\n", eglQueryString(d, EGL_VENDOR));
|
|
|
|
eglGetConfigs(d, configs, MAX_CONFIGS, &numConfigs);
|
|
|
|
eglBindAPI(EGL_OPENGL_API);
|
|
|
|
ctx = eglCreateContext(d, configs[0], EGL_NO_CONTEXT, NULL);
|
|
if (ctx == EGL_NO_CONTEXT) {
|
|
printf("peglgears: failed to create context\n");
|
|
return 0;
|
|
}
|
|
|
|
/* build up screenAttribs array */
|
|
i = 0;
|
|
screenAttribs[i++] = EGL_WIDTH;
|
|
screenAttribs[i++] = width;
|
|
screenAttribs[i++] = EGL_HEIGHT;
|
|
screenAttribs[i++] = height;
|
|
screenAttribs[i++] = EGL_NONE;
|
|
|
|
surface = eglCreatePbufferSurface(d, configs[0], screenAttribs);
|
|
if (surface == EGL_NO_SURFACE) {
|
|
printf("peglgears: failed to create pbuffer surface\n");
|
|
return 0;
|
|
}
|
|
|
|
b = eglMakeCurrent(d, surface, surface, ctx);
|
|
if (!b) {
|
|
printf("peglgears: make current failed\n");
|
|
return 0;
|
|
}
|
|
|
|
if (printInfo)
|
|
{
|
|
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
|
|
printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
|
|
printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
|
|
printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
|
|
}
|
|
|
|
init();
|
|
reshape(width, height);
|
|
|
|
glDrawBuffer( GL_BACK );
|
|
|
|
run_gears(d, surface, 5.0);
|
|
|
|
eglDestroySurface(d, surface);
|
|
eglDestroyContext(d, ctx);
|
|
eglTerminate(d);
|
|
|
|
return 0;
|
|
}
|