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xenocara/dist/Mesa/progs/egl/eglgears.c

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/*
* 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
*/
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <GL/gl.h>
#include <GLES/egl.h>
#include <assert.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)
{
glViewport(0, 0, (GLint) width, (GLint) height);
GLfloat h = (GLfloat) height / (GLfloat) width;
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;
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++;
}
GLfloat seconds = ct - st;
GLfloat fps = frames / seconds;
printf("%d frames in %3.1f seconds = %6.3f FPS\n", frames, seconds, fps);
}
int
main(int argc, char *argv[])
{
int maj, min;
EGLContext ctx;
EGLSurface screen_surf;
EGLConfig configs[MAX_CONFIGS];
EGLint numConfigs, i;
EGLBoolean b;
EGLDisplay d;
EGLint screenAttribs[10];
EGLModeMESA mode[MAX_MODES];
EGLScreenMESA screen;
EGLint count, chosenMode;
GLboolean printInfo = GL_FALSE;
EGLint width = 0, height = 0;
/* 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(":0");
assert(d);
if (!eglInitialize(d, &maj, &min)) {
printf("eglgears: eglInitialize failed\n");
exit(1);
}
printf("eglgears: EGL version = %d.%d\n", maj, min);
printf("eglgears: EGL_VENDOR = %s\n", eglQueryString(d, EGL_VENDOR));
/* XXX use ChooseConfig */
eglGetConfigs(d, configs, MAX_CONFIGS, &numConfigs);
eglGetScreensMESA(d, &screen, 1, &count);
if (!eglGetModesMESA(d, screen, mode, MAX_MODES, &count) || count == 0) {
printf("eglgears: eglGetModesMESA failed!\n");
return 0;
}
/* Print list of modes, and find the one to use */
printf("eglgears: Found %d modes:\n", count);
for (i = 0; i < count; i++) {
EGLint w, h;
eglGetModeAttribMESA(d, mode[i], EGL_WIDTH, &w);
eglGetModeAttribMESA(d, mode[i], EGL_HEIGHT, &h);
printf("%3d: %d x %d\n", i, w, h);
if (w > width && h > height && w <= 1280 && h <= 1024) {
width = w;
height = h;
chosenMode = i;
}
}
printf("eglgears: Using screen mode/size %d: %d x %d\n", chosenMode, width, height);
ctx = eglCreateContext(d, configs[0], EGL_NO_CONTEXT, NULL);
if (ctx == EGL_NO_CONTEXT) {
printf("eglgears: 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;
screen_surf = eglCreateScreenSurfaceMESA(d, configs[0], screenAttribs);
if (screen_surf == EGL_NO_SURFACE) {
printf("eglgears: failed to create screen surface\n");
return 0;
}
b = eglShowScreenSurfaceMESA(d, screen, screen_surf, mode[chosenMode]);
if (!b) {
printf("eglgears: show surface failed\n");
return 0;
}
b = eglMakeCurrent(d, screen_surf, screen_surf, ctx);
if (!b) {
printf("eglgears: 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, screen_surf, 5.0);
eglDestroySurface(d, screen_surf);
eglDestroyContext(d, ctx);
eglTerminate(d);
return 0;
}
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