790 lines
20 KiB
C
790 lines
20 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 "gears" demo to straight GLX (i.e. no GLUT)
|
|
* Port by Brian Paul 23 March 2001
|
|
*
|
|
* Command line options:
|
|
* -info print GL implementation information
|
|
* -stereo use stereo enabled GLX visual
|
|
*
|
|
*/
|
|
|
|
|
|
#include <math.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <X11/Xlib.h>
|
|
#include <X11/keysym.h>
|
|
#include <GL/gl.h>
|
|
#include <GL/glx.h>
|
|
|
|
static int is_glx_extension_supported(Display *dpy, const char *query);
|
|
|
|
static void query_vsync(Display *dpy);
|
|
|
|
#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
|
|
|
|
|
|
/** Event handler results: */
|
|
#define NOP 0
|
|
#define EXIT 1
|
|
#define DRAW 2
|
|
|
|
static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
|
|
static GLint gear1, gear2, gear3;
|
|
static GLfloat angle = 0.0;
|
|
|
|
static GLboolean fullscreen = GL_FALSE; /* Create a single fullscreen window */
|
|
static GLboolean stereo = GL_FALSE; /* Enable stereo. */
|
|
static GLboolean animate = GL_TRUE; /* Animation */
|
|
static GLfloat eyesep = 5.0; /* Eye separation. */
|
|
static GLfloat fix_point = 40.0; /* Fixation point distance. */
|
|
static GLfloat left, right, asp; /* Stereo frustum params. */
|
|
|
|
|
|
/*
|
|
*
|
|
* 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();
|
|
}
|
|
|
|
|
|
static void
|
|
draw_gears(void)
|
|
{
|
|
if (stereo) {
|
|
/* First left eye. */
|
|
glDrawBuffer(GL_BACK_LEFT);
|
|
|
|
glMatrixMode(GL_PROJECTION);
|
|
glLoadIdentity();
|
|
glFrustum(left, right, -asp, asp, 5.0, 60.0);
|
|
|
|
glMatrixMode(GL_MODELVIEW);
|
|
|
|
glPushMatrix();
|
|
glTranslated(+0.5 * eyesep, 0.0, 0.0);
|
|
draw();
|
|
glPopMatrix();
|
|
|
|
/* Then right eye. */
|
|
glDrawBuffer(GL_BACK_RIGHT);
|
|
|
|
glMatrixMode(GL_PROJECTION);
|
|
glLoadIdentity();
|
|
glFrustum(-right, -left, -asp, asp, 5.0, 60.0);
|
|
|
|
glMatrixMode(GL_MODELVIEW);
|
|
|
|
glPushMatrix();
|
|
glTranslated(-0.5 * eyesep, 0.0, 0.0);
|
|
draw();
|
|
glPopMatrix();
|
|
}
|
|
else {
|
|
draw();
|
|
}
|
|
}
|
|
|
|
|
|
/** Draw single frame, do SwapBuffers, compute FPS */
|
|
static void
|
|
draw_frame(Display *dpy, Window win)
|
|
{
|
|
static int frames = 0;
|
|
static double tRot0 = -1.0, tRate0 = -1.0;
|
|
double dt, t = current_time();
|
|
|
|
if (tRot0 < 0.0)
|
|
tRot0 = t;
|
|
dt = t - tRot0;
|
|
tRot0 = t;
|
|
|
|
if (animate) {
|
|
/* advance rotation for next frame */
|
|
angle += 70.0 * dt; /* 70 degrees per second */
|
|
if (angle > 3600.0)
|
|
angle -= 3600.0;
|
|
}
|
|
|
|
draw_gears();
|
|
glXSwapBuffers(dpy, win);
|
|
|
|
frames++;
|
|
|
|
if (tRate0 < 0.0)
|
|
tRate0 = t;
|
|
if (t - tRate0 >= 5.0) {
|
|
GLfloat seconds = t - tRate0;
|
|
GLfloat fps = frames / seconds;
|
|
printf("%d frames in %3.1f seconds = %6.3f FPS\n", frames, seconds,
|
|
fps);
|
|
tRate0 = t;
|
|
frames = 0;
|
|
}
|
|
}
|
|
|
|
|
|
/* new window size or exposure */
|
|
static void
|
|
reshape(int width, int height)
|
|
{
|
|
glViewport(0, 0, (GLint) width, (GLint) height);
|
|
|
|
if (stereo) {
|
|
GLfloat w;
|
|
|
|
asp = (GLfloat) height / (GLfloat) width;
|
|
w = fix_point * (1.0 / 5.0);
|
|
|
|
left = -5.0 * ((w - 0.5 * eyesep) / fix_point);
|
|
right = 5.0 * ((w + 0.5 * eyesep) / fix_point);
|
|
}
|
|
else {
|
|
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);
|
|
}
|
|
|
|
|
|
/**
|
|
* Remove window border/decorations.
|
|
*/
|
|
static void
|
|
no_border( Display *dpy, Window w)
|
|
{
|
|
static const unsigned MWM_HINTS_DECORATIONS = (1 << 1);
|
|
static const int PROP_MOTIF_WM_HINTS_ELEMENTS = 5;
|
|
|
|
typedef struct
|
|
{
|
|
unsigned long flags;
|
|
unsigned long functions;
|
|
unsigned long decorations;
|
|
long inputMode;
|
|
unsigned long status;
|
|
} PropMotifWmHints;
|
|
|
|
PropMotifWmHints motif_hints;
|
|
Atom prop, proptype;
|
|
unsigned long flags = 0;
|
|
|
|
/* setup the property */
|
|
motif_hints.flags = MWM_HINTS_DECORATIONS;
|
|
motif_hints.decorations = flags;
|
|
|
|
/* get the atom for the property */
|
|
prop = XInternAtom( dpy, "_MOTIF_WM_HINTS", True );
|
|
if (!prop) {
|
|
/* something went wrong! */
|
|
return;
|
|
}
|
|
|
|
/* not sure this is correct, seems to work, XA_WM_HINTS didn't work */
|
|
proptype = prop;
|
|
|
|
XChangeProperty( dpy, w, /* display, window */
|
|
prop, proptype, /* property, type */
|
|
32, /* format: 32-bit datums */
|
|
PropModeReplace, /* mode */
|
|
(unsigned char *) &motif_hints, /* data */
|
|
PROP_MOTIF_WM_HINTS_ELEMENTS /* nelements */
|
|
);
|
|
}
|
|
|
|
|
|
/*
|
|
* Create an RGB, double-buffered window.
|
|
* Return the window and context handles.
|
|
*/
|
|
static void
|
|
make_window( Display *dpy, const char *name,
|
|
int x, int y, int width, int height,
|
|
Window *winRet, GLXContext *ctxRet)
|
|
{
|
|
int attribs[] = { GLX_RGBA,
|
|
GLX_RED_SIZE, 1,
|
|
GLX_GREEN_SIZE, 1,
|
|
GLX_BLUE_SIZE, 1,
|
|
GLX_DOUBLEBUFFER,
|
|
GLX_DEPTH_SIZE, 1,
|
|
None };
|
|
int stereoAttribs[] = { GLX_RGBA,
|
|
GLX_RED_SIZE, 1,
|
|
GLX_GREEN_SIZE, 1,
|
|
GLX_BLUE_SIZE, 1,
|
|
GLX_DOUBLEBUFFER,
|
|
GLX_DEPTH_SIZE, 1,
|
|
GLX_STEREO,
|
|
None };
|
|
int scrnum;
|
|
XSetWindowAttributes attr;
|
|
unsigned long mask;
|
|
Window root;
|
|
Window win;
|
|
GLXContext ctx;
|
|
XVisualInfo *visinfo;
|
|
|
|
scrnum = DefaultScreen( dpy );
|
|
root = RootWindow( dpy, scrnum );
|
|
|
|
if (fullscreen) {
|
|
x = 0; y = 0;
|
|
width = DisplayWidth( dpy, scrnum );
|
|
height = DisplayHeight( dpy, scrnum );
|
|
}
|
|
|
|
if (stereo)
|
|
visinfo = glXChooseVisual( dpy, scrnum, stereoAttribs );
|
|
else
|
|
visinfo = glXChooseVisual( dpy, scrnum, attribs );
|
|
if (!visinfo) {
|
|
if (stereo) {
|
|
printf("Error: couldn't get an RGB, "
|
|
"Double-buffered, Stereo visual\n");
|
|
} else
|
|
printf("Error: couldn't get an RGB, Double-buffered visual\n");
|
|
exit(1);
|
|
}
|
|
|
|
/* window attributes */
|
|
attr.background_pixel = 0;
|
|
attr.border_pixel = 0;
|
|
attr.colormap = XCreateColormap( dpy, root, visinfo->visual, AllocNone);
|
|
attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
|
|
/* XXX this is a bad way to get a borderless window! */
|
|
mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
|
|
|
|
win = XCreateWindow( dpy, root, x, y, width, height,
|
|
0, visinfo->depth, InputOutput,
|
|
visinfo->visual, mask, &attr );
|
|
|
|
if (fullscreen)
|
|
no_border(dpy, win);
|
|
|
|
/* set hints and properties */
|
|
{
|
|
XSizeHints sizehints;
|
|
sizehints.x = x;
|
|
sizehints.y = y;
|
|
sizehints.width = width;
|
|
sizehints.height = height;
|
|
sizehints.flags = USSize | USPosition;
|
|
XSetNormalHints(dpy, win, &sizehints);
|
|
XSetStandardProperties(dpy, win, name, name,
|
|
None, (char **)NULL, 0, &sizehints);
|
|
}
|
|
|
|
ctx = glXCreateContext( dpy, visinfo, NULL, True );
|
|
if (!ctx) {
|
|
printf("Error: glXCreateContext failed\n");
|
|
exit(1);
|
|
}
|
|
|
|
XFree(visinfo);
|
|
|
|
*winRet = win;
|
|
*ctxRet = ctx;
|
|
}
|
|
|
|
|
|
/**
|
|
* Determine whether or not a GLX extension is supported.
|
|
*/
|
|
int
|
|
is_glx_extension_supported(Display *dpy, const char *query)
|
|
{
|
|
const int scrnum = DefaultScreen(dpy);
|
|
const char *glx_extensions = NULL;
|
|
const size_t len = strlen(query);
|
|
const char *ptr;
|
|
|
|
if (glx_extensions == NULL) {
|
|
glx_extensions = glXQueryExtensionsString(dpy, scrnum);
|
|
}
|
|
|
|
ptr = strstr(glx_extensions, query);
|
|
return ((ptr != NULL) && ((ptr[len] == ' ') || (ptr[len] == '\0')));
|
|
}
|
|
|
|
|
|
/**
|
|
* Attempt to determine whether or not the display is synched to vblank.
|
|
*/
|
|
void
|
|
query_vsync(Display *dpy)
|
|
{
|
|
int interval = 0;
|
|
|
|
|
|
#ifdef GLX_MESA_swap_control
|
|
if ((interval <= 0)
|
|
&& is_glx_extension_supported(dpy, "GLX_MESA_swap_control")) {
|
|
PFNGLXGETSWAPINTERVALMESAPROC pglXGetSwapIntervalMESA =
|
|
(PFNGLXGETSWAPINTERVALMESAPROC)
|
|
glXGetProcAddressARB((const GLubyte *) "glXGetSwapIntervalMESA");
|
|
|
|
interval = (*pglXGetSwapIntervalMESA)();
|
|
}
|
|
#endif
|
|
|
|
|
|
#ifdef GLX_SGI_video_sync
|
|
if ((interval <= 0)
|
|
&& is_glx_extension_supported(dpy, "GLX_SGI_video_sync")) {
|
|
PFNGLXGETVIDEOSYNCSGIPROC pglXGetVideoSyncSGI =
|
|
(PFNGLXGETVIDEOSYNCSGIPROC)
|
|
glXGetProcAddressARB((const GLubyte *) "glXGetVideoSyncSGI");
|
|
unsigned count;
|
|
|
|
if ((*pglXGetVideoSyncSGI)(& count) == 0) {
|
|
interval = (int) count;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
|
|
if (interval > 0) {
|
|
printf("Running synchronized to the vertical refresh. The framerate should be\n");
|
|
if (interval == 1) {
|
|
printf("approximately the same as the monitor refresh rate.\n");
|
|
} else if (interval > 1) {
|
|
printf("approximately 1/%d the monitor refresh rate.\n",
|
|
interval);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handle one X event.
|
|
* \return NOP, EXIT or DRAW
|
|
*/
|
|
static int
|
|
handle_event(Display *dpy, Window win, XEvent *event)
|
|
{
|
|
(void) dpy;
|
|
(void) win;
|
|
|
|
switch (event->type) {
|
|
case Expose:
|
|
return DRAW;
|
|
case ConfigureNotify:
|
|
reshape(event->xconfigure.width, event->xconfigure.height);
|
|
break;
|
|
case KeyPress:
|
|
{
|
|
char buffer[10];
|
|
int r, code;
|
|
code = XLookupKeysym(&event->xkey, 0);
|
|
if (code == XK_Left) {
|
|
view_roty += 5.0;
|
|
}
|
|
else if (code == XK_Right) {
|
|
view_roty -= 5.0;
|
|
}
|
|
else if (code == XK_Up) {
|
|
view_rotx += 5.0;
|
|
}
|
|
else if (code == XK_Down) {
|
|
view_rotx -= 5.0;
|
|
}
|
|
else {
|
|
r = XLookupString(&event->xkey, buffer, sizeof(buffer),
|
|
NULL, NULL);
|
|
if (buffer[0] == 27) {
|
|
/* escape */
|
|
return EXIT;
|
|
}
|
|
else if (buffer[0] == 'a' || buffer[0] == 'A') {
|
|
animate = !animate;
|
|
}
|
|
}
|
|
return DRAW;
|
|
}
|
|
}
|
|
return NOP;
|
|
}
|
|
|
|
|
|
static void
|
|
event_loop(Display *dpy, Window win)
|
|
{
|
|
while (1) {
|
|
int op;
|
|
while (!animate || XPending(dpy) > 0) {
|
|
XEvent event;
|
|
XNextEvent(dpy, &event);
|
|
op = handle_event(dpy, win, &event);
|
|
if (op == EXIT)
|
|
return;
|
|
else if (op == DRAW)
|
|
break;
|
|
}
|
|
|
|
draw_frame(dpy, win);
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
printf("Usage:\n");
|
|
printf(" -display <displayname> set the display to run on\n");
|
|
printf(" -stereo run in stereo mode\n");
|
|
printf(" -fullscreen run in fullscreen mode\n");
|
|
printf(" -info display OpenGL renderer info\n");
|
|
printf(" -geometry WxH+X+Y window geometry\n");
|
|
}
|
|
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
unsigned int winWidth = 300, winHeight = 300;
|
|
int x = 0, y = 0;
|
|
Display *dpy;
|
|
Window win;
|
|
GLXContext ctx;
|
|
char *dpyName = NULL;
|
|
GLboolean printInfo = GL_FALSE;
|
|
int i;
|
|
|
|
for (i = 1; i < argc; i++) {
|
|
if (strcmp(argv[i], "-display") == 0) {
|
|
dpyName = argv[i+1];
|
|
i++;
|
|
}
|
|
else if (strcmp(argv[i], "-info") == 0) {
|
|
printInfo = GL_TRUE;
|
|
}
|
|
else if (strcmp(argv[i], "-stereo") == 0) {
|
|
stereo = GL_TRUE;
|
|
}
|
|
else if (strcmp(argv[i], "-fullscreen") == 0) {
|
|
fullscreen = GL_TRUE;
|
|
}
|
|
else if (i < argc-1 && strcmp(argv[i], "-geometry") == 0) {
|
|
XParseGeometry(argv[i+1], &x, &y, &winWidth, &winHeight);
|
|
i++;
|
|
}
|
|
else {
|
|
usage();
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
dpy = XOpenDisplay(dpyName);
|
|
if (!dpy) {
|
|
printf("Error: couldn't open display %s\n",
|
|
dpyName ? dpyName : getenv("DISPLAY"));
|
|
return -1;
|
|
}
|
|
|
|
make_window(dpy, "glxgears", x, y, winWidth, winHeight, &win, &ctx);
|
|
XMapWindow(dpy, win);
|
|
glXMakeCurrent(dpy, win, ctx);
|
|
query_vsync(dpy);
|
|
|
|
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();
|
|
|
|
/* Set initial projection/viewing transformation.
|
|
* We can't be sure we'll get a ConfigureNotify event when the window
|
|
* first appears.
|
|
*/
|
|
reshape(winWidth, winHeight);
|
|
|
|
event_loop(dpy, win);
|
|
|
|
glDeleteLists(gear1, 1);
|
|
glDeleteLists(gear2, 1);
|
|
glDeleteLists(gear3, 1);
|
|
glXDestroyContext(dpy, ctx);
|
|
XDestroyWindow(dpy, win);
|
|
XCloseDisplay(dpy);
|
|
|
|
return 0;
|
|
}
|