500 lines
13 KiB
C
500 lines
13 KiB
C
/*
|
|
* Test AUX buffer rendering
|
|
* Use GLX since GLUT doesn't support AUX buffers
|
|
*/
|
|
|
|
|
|
/*
|
|
* 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
|
|
*
|
|
*/
|
|
|
|
|
|
#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
|
|
current_time(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
|
|
#ifndef M_PI
|
|
#define M_PI 3.14159265
|
|
#endif
|
|
|
|
static int WinWidth = 300, WinHeight = 300;
|
|
static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
|
|
static GLint gear1, gear2, gear3;
|
|
static GLfloat angle = 0.0;
|
|
|
|
|
|
/*
|
|
*
|
|
* 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;
|
|
|
|
WinWidth = width;
|
|
WinHeight = height;
|
|
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 };
|
|
int i;
|
|
|
|
glGetIntegerv(GL_AUX_BUFFERS, &i);
|
|
printf("AUX BUFFERS: %d\n", i);
|
|
|
|
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);
|
|
}
|
|
|
|
|
|
/*
|
|
* 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 attrib[] = { GLX_RGBA,
|
|
GLX_RED_SIZE, 1,
|
|
GLX_GREEN_SIZE, 1,
|
|
GLX_BLUE_SIZE, 1,
|
|
GLX_DOUBLEBUFFER,
|
|
GLX_DEPTH_SIZE, 1,
|
|
GLX_AUX_BUFFERS, 1,
|
|
None };
|
|
int scrnum;
|
|
XSetWindowAttributes attr;
|
|
unsigned long mask;
|
|
Window root;
|
|
Window win;
|
|
GLXContext ctx;
|
|
XVisualInfo *visinfo;
|
|
|
|
scrnum = DefaultScreen( dpy );
|
|
root = RootWindow( dpy, scrnum );
|
|
|
|
visinfo = glXChooseVisual( dpy, scrnum, attrib );
|
|
if (!visinfo) {
|
|
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;
|
|
mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
|
|
|
|
win = XCreateWindow( dpy, root, 0, 0, width, height,
|
|
0, visinfo->depth, InputOutput,
|
|
visinfo->visual, mask, &attr );
|
|
|
|
/* 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;
|
|
}
|
|
|
|
|
|
static void
|
|
event_loop(Display *dpy, Window win)
|
|
{
|
|
while (1) {
|
|
while (XPending(dpy) > 0) {
|
|
XEvent event;
|
|
XNextEvent(dpy, &event);
|
|
switch (event.type) {
|
|
case Expose:
|
|
/* we'll redraw below */
|
|
break;
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* next frame */
|
|
angle += 2.0;
|
|
|
|
/* draw to aux buffer */
|
|
glDrawBuffer(GL_AUX0);
|
|
|
|
draw();
|
|
|
|
/* Copy aux buffer image to back color buffer */
|
|
glReadBuffer(GL_AUX0);
|
|
glDrawBuffer(GL_BACK);
|
|
glWindowPos2iARB(0, 0);
|
|
glDisable(GL_DEPTH_TEST);
|
|
glCopyPixels(0, 0, WinWidth, WinHeight, GL_COLOR);
|
|
glEnable(GL_DEPTH_TEST);
|
|
|
|
glXSwapBuffers(dpy, win);
|
|
|
|
/* calc framerate */
|
|
{
|
|
static int t0 = -1;
|
|
static int frames = 0;
|
|
int t = current_time();
|
|
|
|
if (t0 < 0)
|
|
t0 = t;
|
|
|
|
frames++;
|
|
|
|
if (t - t0 >= 5.0) {
|
|
GLfloat seconds = t - t0;
|
|
GLfloat fps = frames / seconds;
|
|
printf("%d frames in %3.1f seconds = %6.3f FPS\n", frames, seconds,
|
|
fps);
|
|
t0 = t;
|
|
frames = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
Display *dpy;
|
|
Window win;
|
|
GLXContext ctx;
|
|
char *dpyName = ":0";
|
|
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;
|
|
}
|
|
}
|
|
|
|
dpy = XOpenDisplay(dpyName);
|
|
if (!dpy) {
|
|
printf("Error: couldn't open display %s\n", dpyName);
|
|
return -1;
|
|
}
|
|
|
|
make_window(dpy, "glxgears", 0, 0, WinWidth, WinHeight, &win, &ctx);
|
|
XMapWindow(dpy, win);
|
|
glXMakeCurrent(dpy, win, ctx);
|
|
|
|
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();
|
|
|
|
event_loop(dpy, win);
|
|
|
|
glXDestroyContext(dpy, ctx);
|
|
XDestroyWindow(dpy, win);
|
|
XCloseDisplay(dpy);
|
|
|
|
return 0;
|
|
}
|