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| -rw-r--r-- | progs/xdemos/glxgears.c | 497 |
1 files changed, 497 insertions, 0 deletions
diff --git a/progs/xdemos/glxgears.c b/progs/xdemos/glxgears.c new file mode 100644 index 0000000000..53c20980cd --- /dev/null +++ b/progs/xdemos/glxgears.c @@ -0,0 +1,497 @@ +/* + * 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> + + +#define BENCHMARK + +#ifdef BENCHMARK + +/* XXX this probably isn't very portable */ + +#include <sys/time.h> +#include <unistd.h> + +/* return current time (in seconds) */ +static int +current_time(void) +{ + struct timeval tv; + struct timezone tz; + (void) gettimeofday(&tv, &tz); + return (int) tv.tv_sec; +} + +#else /*BENCHMARK*/ + +/* dummy */ +static int +current_time(void) +{ + return 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; + + +/* + * + * 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); +} + + +/* + * 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, + 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(); + 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, 300, 300, &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; +} |