kopia lustrzana https://github.com/FreeSpacenav/libspnav
much nicer fly example
John Tsiombikas
rodzic
789513c09a
commit
c006320d78
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@ -1,4 +1,4 @@
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obj = fly.o
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obj = fly.o xwin.o
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bin = fly
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CC ?= gcc
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@ -1,9 +1,6 @@
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/* This example demonstrates how to use 6-dof input for controlling the camera
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* to fly around a scene. The native spacenav protocol is used, to also
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* demonstrate how to integrate input from libspnav in an event loop.
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*
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* The code is a bit cluttered with X11 and GLX calls, so the interesting bits
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* are marked with XXX comments.
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*/
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#include <stdio.h>
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@ -16,28 +13,28 @@
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#include <GL/glu.h>
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#include <GL/glx.h>
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#include <spnav.h>
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#include "xwin.h"
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#define GRID_REP 60
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#define GRID_SZ 200
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int create_gfx(int xsz, int ysz);
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void destroy_gfx(void);
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void set_window_title(const char *title);
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void gen_textures(void);
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void gen_scene(void);
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void redraw(void);
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void draw_scene(void);
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void draw_box(float xsz, float ysz, float zsz);
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int handle_xevent(XEvent *xev);
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void handle_spnav_event(spnav_event *ev);
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int handle_xevent(XEvent *xev);
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void draw_box(float xsz, float ysz, float zsz);
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Display *dpy;
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Atom wm_prot, wm_del_win;
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GLXContext ctx;
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Window win;
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/* XXX: posrot contains a position vector and an orientation quaternion, and
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* can be used with the spnav_posrot_moveobj function to accumulate input
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* motions, and then with spnav_matrix_obj to create a transformation matrix.
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* See util.c in the libspnav source code for implementation details.
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*/
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struct spnav_posrot posrot;
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int redisplay;
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unsigned int grid_tex, box_tex;
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unsigned int scene;
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int main(void)
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@ -49,7 +46,7 @@ int main(void)
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return 1;
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}
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if(create_gfx(1024, 768) == -1) {
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if(create_xwin("libspnav fly", 1024, 768) == -1) {
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return 1;
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}
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@ -58,12 +55,18 @@ int main(void)
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fprintf(stderr, "failed to connect to the spacenav driver\n");
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return 1;
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}
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/* XXX: initialize the position vector & orientation quaternion */
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spnav_posrot_init(&posrot);
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glEnable(GL_DEPTH_TEST);
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glEnable(GL_CULL_FACE);
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glFogi(GL_FOG_MODE, GL_LINEAR);
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glFogf(GL_FOG_START, GRID_SZ / 4);
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glFogf(GL_FOG_END, GRID_SZ);
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gen_textures();
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gen_scene();
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/* XXX: grab the Xlib socket and the libspnav socket. we'll need them in the
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* select loop to wait for input from either source.
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@ -102,127 +105,40 @@ int main(void)
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}
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}
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if(redisplay) {
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if(redisplay_pending) {
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redisplay_pending = 0;
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redraw();
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redisplay = 0;
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}
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}
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end:
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destroy_gfx();
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glDeleteTextures(1, &grid_tex);
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destroy_xwin();
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spnav_close();
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return 0;
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}
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int create_gfx(int xsz, int ysz)
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{
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int scr;
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Window root;
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XVisualInfo *vis;
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XSetWindowAttributes xattr;
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unsigned int events;
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XClassHint class_hint;
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int attr[] = {
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GLX_RGBA, GLX_DOUBLEBUFFER,
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GLX_RED_SIZE, 8,
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GLX_GREEN_SIZE, 8,
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GLX_BLUE_SIZE, 8,
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GLX_DEPTH_SIZE, 24,
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None
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};
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wm_prot = XInternAtom(dpy, "WM_PROTOCOLS", False);
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wm_del_win = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
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scr = DefaultScreen(dpy);
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root = RootWindow(dpy, scr);
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if(!(vis = glXChooseVisual(dpy, scr, attr))) {
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fprintf(stderr, "requested GLX visual is not available\n");
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return -1;
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}
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if(!(ctx = glXCreateContext(dpy, vis, 0, True))) {
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fprintf(stderr, "failed to create GLX context\n");
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XFree(vis);
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return -1;
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}
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xattr.background_pixel = xattr.border_pixel = BlackPixel(dpy, scr);
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xattr.colormap = XCreateColormap(dpy, root, vis->visual, AllocNone);
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if(!(win = XCreateWindow(dpy, root, 0, 0, xsz, ysz, 0, vis->depth, InputOutput,
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vis->visual, CWColormap | CWBackPixel | CWBorderPixel, &xattr))) {
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fprintf(stderr, "failed to create X window\n");
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return -1;
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}
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XFree(vis);
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/* set the window event mask */
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events = ExposureMask | StructureNotifyMask | KeyPressMask | KeyReleaseMask |
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ButtonReleaseMask | ButtonPressMask | PointerMotionMask;
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XSelectInput(dpy, win, events);
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XSetWMProtocols(dpy, win, &wm_del_win, 1);
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set_window_title("libspnav cube");
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class_hint.res_name = "cube";
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class_hint.res_class = "cube";
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XSetClassHint(dpy, win, &class_hint);
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if(glXMakeCurrent(dpy, win, ctx) == False) {
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fprintf(stderr, "glXMakeCurrent failed\n");
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glXDestroyContext(dpy, ctx);
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XDestroyWindow(dpy, win);
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return -1;
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}
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XMapWindow(dpy, win);
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XFlush(dpy);
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return 0;
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}
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void destroy_gfx(void)
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{
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glDeleteTextures(1, &grid_tex);
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glXDestroyContext(dpy, ctx);
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XDestroyWindow(dpy, win);
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glXMakeCurrent(dpy, None, 0);
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}
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void set_window_title(const char *title)
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{
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XTextProperty wm_name;
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XStringListToTextProperty((char**)&title, 1, &wm_name);
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XSetWMName(dpy, win, &wm_name);
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XSetWMIconName(dpy, win, &wm_name);
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XFree(wm_name.value);
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}
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void gen_textures(void)
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{
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int i, j;
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static unsigned char grid_pixels[128 * 128 * 3];
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int i, j, r, g, b;
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static unsigned char pixels[128 * 128 * 3];
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unsigned char *pptr;
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pptr = grid_pixels;
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pptr = pixels;
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for(i=0; i<128; i++) {
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float dy = abs(i - 64) / 64.0f;
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for(j=0; j<128; j++) {
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float dx = abs(j - 64) / 64.0f;
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float d = dx > dy ? dx : dy;
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float val = pow(d, 8.0);
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if(val > 1.0f) val = 1.0f;
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float val = pow(d * 1.04f, 10.0) * 1.4f;
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*pptr++ = (int)(214.0f * val);
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*pptr++ = (int)(76.0f * val);
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*pptr++ = (int)(255.0f * val);
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r = (int)(214.0f * val);
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g = (int)(76.0f * val);
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b = (int)(255.0f * val);
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*pptr++ = r > 255 ? 255 : r;
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*pptr++ = g > 255 ? 255 : g;
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*pptr++ = b > 255 ? 255 : b;
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}
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}
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@ -230,28 +146,53 @@ void gen_textures(void)
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glBindTexture(GL_TEXTURE_2D, grid_tex);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGB, 128, 128, GL_RGB, GL_UNSIGNED_BYTE, grid_pixels);
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gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGB, 128, 128, GL_RGB, GL_UNSIGNED_BYTE, pixels);
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pptr = pixels;
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for(i=0; i<128; i++) {
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int row = i >> 5;
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float dy = ((i - 12) & 0x1f) / 16.0f;
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for(j=0; j<128; j++) {
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int col = j >> 5;
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float dx = ((j - 12) & 0x1f) / 16.0f;
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float d = dx > dy ? dx : dy;
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int xor = (col ^ row) & 0xf;
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r = d < 0.5f ? (xor << 4) + 20 : 0;
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g = d < 0.5f ? (xor << 4) + 20 : 0;
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b = d < 0.5f ? (xor << 4) + 20 : 0;
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*pptr++ = r > 255 ? 255 : r;
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*pptr++ = g > 255 ? 255 : g;
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*pptr++ = b > 255 ? 255 : b;
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}
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}
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glGenTextures(1, &box_tex);
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glBindTexture(GL_TEXTURE_2D, box_tex);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGB, 128, 128, GL_RGB, GL_UNSIGNED_BYTE, pixels);
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}
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#define GRID_REP 60
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#define GRID_SZ 200
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void redraw(void)
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void gen_scene(void)
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{
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float xform[16];
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int i, j;
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float x, y, h;
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/* XXX convert the accumulated position/rotation into a 4x4 view matrix */
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spnav_matrix_view(xform, &posrot);
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srand(0);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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scene = glGenLists(1);
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glNewList(scene, GL_COMPILE);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glMultMatrixf(xform);
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glBindTexture(GL_TEXTURE_2D, grid_tex);
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glEnable(GL_TEXTURE_2D);
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glEnable(GL_FOG);
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/* grid */
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glBindTexture(GL_TEXTURE_2D, grid_tex);
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glBegin(GL_QUADS);
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glColor3f(1, 1, 1);
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glTexCoord2f(0, 0);
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glVertex3f(-GRID_SZ, 0, GRID_SZ);
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glTexCoord2f(GRID_REP, 0);
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@ -261,103 +202,73 @@ void redraw(void)
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glTexCoord2f(0, GRID_REP);
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glVertex3f(-GRID_SZ, 0, -GRID_SZ);
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glEnd();
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glDisable(GL_TEXTURE_2D);
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draw_box(1, 1, 1);
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/* buildings */
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glBindTexture(GL_TEXTURE_2D, box_tex);
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for(i=0; i<8; i++) {
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for(j=0; j<8; j++) {
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x = (j - 4.0f + 0.5f * (float)rand() / RAND_MAX) * 20.0f;
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y = (i - 4.0f + 0.5f * (float)rand() / RAND_MAX) * 20.0f;
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h = (3.0f + (float)rand() / RAND_MAX) * 6.0f;
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glPushMatrix();
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glTranslatef(x, h/2, y);
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glMatrixMode(GL_TEXTURE);
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glLoadIdentity();
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glScalef(3, h/4, 1);
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draw_box(6, h, 6);
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glLoadIdentity();
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glMatrixMode(GL_MODELVIEW);
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glPopMatrix();
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}
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}
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glDisable(GL_TEXTURE_2D);
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glDisable(GL_FOG);
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/* skydome */
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glBegin(GL_TRIANGLE_FAN);
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glColor3f(0.07, 0.1, 0.4);
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glVertex3f(0, GRID_SZ/5, 0);
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glColor3f(0.5, 0.2, 0.05);
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glVertex3f(-GRID_SZ, 0, -GRID_SZ);
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glVertex3f(GRID_SZ, 0, -GRID_SZ);
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glVertex3f(GRID_SZ, 0, GRID_SZ);
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glVertex3f(-GRID_SZ, 0, GRID_SZ);
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glVertex3f(-GRID_SZ, 0, -GRID_SZ);
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glEnd();
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glEndList();
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}
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void redraw(void)
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{
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float xform[16];
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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/* XXX convert the accumulated position/rotation into a 4x4 view matrix */
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spnav_matrix_view(xform, &posrot);
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glMultMatrixf(xform); /* concatenate our computed view matrix */
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glTranslatef(0, -5, 0); /* move the default view a bit higher above the ground */
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glCallList(scene);
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glXSwapBuffers(dpy, win);
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}
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void draw_scene(void)
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void reshape(int x, int y)
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{
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}
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glViewport(0, 0, x, y);
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void draw_box(float xsz, float ysz, float zsz)
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{
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xsz /= 2;
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ysz /= 2;
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zsz /= 2;
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glBegin(GL_QUADS);
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/* face +Z */
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glNormal3f(0, 0, 1);
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glVertex3f(-xsz, -ysz, zsz);
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glVertex3f(xsz, -ysz, zsz);
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glVertex3f(xsz, ysz, zsz);
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glVertex3f(-xsz, ysz, zsz);
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/* face +X */
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glNormal3f(1, 0, 0);
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glVertex3f(xsz, -ysz, zsz);
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glVertex3f(xsz, -ysz, -zsz);
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glVertex3f(xsz, ysz, -zsz);
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glVertex3f(xsz, ysz, zsz);
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/* face -Z */
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glNormal3f(0, 0, -1);
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glVertex3f(xsz, -ysz, -zsz);
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glVertex3f(-xsz, -ysz, -zsz);
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glVertex3f(-xsz, ysz, -zsz);
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glVertex3f(xsz, ysz, -zsz);
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/* face -X */
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glNormal3f(-1, 0, 0);
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glVertex3f(-xsz, -ysz, -zsz);
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glVertex3f(-xsz, -ysz, zsz);
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glVertex3f(-xsz, ysz, zsz);
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glVertex3f(-xsz, ysz, -zsz);
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/* face +Y */
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glNormal3f(0, 1, 0);
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glVertex3f(-xsz, ysz, zsz);
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glVertex3f(xsz, ysz, zsz);
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glVertex3f(xsz, ysz, -zsz);
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glVertex3f(-xsz, ysz, -zsz);
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/* face -Y */
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glNormal3f(0, -1, 0);
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glVertex3f(-xsz, -ysz, -zsz);
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glVertex3f(xsz, -ysz, -zsz);
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glVertex3f(xsz, -ysz, zsz);
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glVertex3f(-xsz, -ysz, zsz);
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glEnd();
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}
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int handle_xevent(XEvent *xev)
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{
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int x, y;
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KeySym sym;
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switch(xev->type) {
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case Expose:
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redisplay = 1;
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break;
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case ClientMessage:
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if(xev->xclient.message_type == wm_prot) {
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if(xev->xclient.data.l[0] == wm_del_win) {
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return 1;
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}
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}
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break;
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case KeyPress:
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sym = XLookupKeysym((XKeyEvent*)&xev->xkey, 0);
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if((sym & 0xff) == 27) {
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return 1;
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}
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break;
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case ConfigureNotify:
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x = xev->xconfigure.width;
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y = xev->xconfigure.height;
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glViewport(0, 0, x, y);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective(50.0, (float)x / (float)y, 0.5, 500.0);
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break;
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default:
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break;
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}
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return 0;
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective(50.0, (float)x / (float)y, 0.5, 500.0);
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}
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void handle_spnav_event(spnav_event *ev)
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|
|
@ -382,7 +293,7 @@ void handle_spnav_event(spnav_event *ev)
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* anything by processing a whole queue of relative motions.
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*/
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spnav_remove_events(SPNAV_EVENT_MOTION);
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redisplay = 1;
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redisplay_pending = 1;
|
||||
break;
|
||||
|
||||
case SPNAV_EVENT_BUTTON:
|
||||
|
|
@ -390,10 +301,58 @@ void handle_spnav_event(spnav_event *ev)
|
|||
* reset the view
|
||||
*/
|
||||
spnav_posrot_init(&posrot);
|
||||
redisplay = 1;
|
||||
redisplay_pending = 1;
|
||||
break;
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
void draw_box(float xsz, float ysz, float zsz)
|
||||
{
|
||||
xsz /= 2;
|
||||
ysz /= 2;
|
||||
zsz /= 2;
|
||||
|
||||
glBegin(GL_QUADS);
|
||||
/* face +Z */
|
||||
glNormal3f(0, 0, 1);
|
||||
glTexCoord2f(0, 0); glVertex3f(-xsz, -ysz, zsz);
|
||||
glTexCoord2f(1, 0); glVertex3f(xsz, -ysz, zsz);
|
||||
glTexCoord2f(1, 1); glVertex3f(xsz, ysz, zsz);
|
||||
glTexCoord2f(0, 1); glVertex3f(-xsz, ysz, zsz);
|
||||
/* face +X */
|
||||
glNormal3f(1, 0, 0);
|
||||
glTexCoord2f(0, 0); glVertex3f(xsz, -ysz, zsz);
|
||||
glTexCoord2f(1, 0); glVertex3f(xsz, -ysz, -zsz);
|
||||
glTexCoord2f(1, 1); glVertex3f(xsz, ysz, -zsz);
|
||||
glTexCoord2f(0, 1); glVertex3f(xsz, ysz, zsz);
|
||||
/* face -Z */
|
||||
glNormal3f(0, 0, -1);
|
||||
glTexCoord2f(0, 0); glVertex3f(xsz, -ysz, -zsz);
|
||||
glTexCoord2f(1, 0); glVertex3f(-xsz, -ysz, -zsz);
|
||||
glTexCoord2f(1, 1); glVertex3f(-xsz, ysz, -zsz);
|
||||
glTexCoord2f(0, 1); glVertex3f(xsz, ysz, -zsz);
|
||||
/* face -X */
|
||||
glNormal3f(-1, 0, 0);
|
||||
glTexCoord2f(0, 0); glVertex3f(-xsz, -ysz, -zsz);
|
||||
glTexCoord2f(1, 0); glVertex3f(-xsz, -ysz, zsz);
|
||||
glTexCoord2f(1, 1); glVertex3f(-xsz, ysz, zsz);
|
||||
glTexCoord2f(0, 1); glVertex3f(-xsz, ysz, -zsz);
|
||||
/* face +Y */
|
||||
glNormal3f(0, 1, 0);
|
||||
glTexCoord2f(0, 0);
|
||||
glVertex3f(-xsz, ysz, zsz);
|
||||
glVertex3f(xsz, ysz, zsz);
|
||||
glVertex3f(xsz, ysz, -zsz);
|
||||
glVertex3f(-xsz, ysz, -zsz);
|
||||
/* face -Y */
|
||||
glNormal3f(0, -1, 0);
|
||||
glTexCoord2f(0, 0);
|
||||
glVertex3f(-xsz, -ysz, -zsz);
|
||||
glVertex3f(xsz, -ysz, -zsz);
|
||||
glVertex3f(xsz, -ysz, zsz);
|
||||
glVertex3f(-xsz, -ysz, zsz);
|
||||
glEnd();
|
||||
}
|
||||
|
|
|
|||
|
|
@ -0,0 +1,141 @@
|
|||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <X11/Xlib.h>
|
||||
#include <GL/glx.h>
|
||||
#include "xwin.h"
|
||||
|
||||
void reshape(int x, int y);
|
||||
void set_window_title(const char *title);
|
||||
|
||||
Display *dpy;
|
||||
Atom wm_prot, wm_del_win;
|
||||
GLXContext ctx;
|
||||
Window win;
|
||||
int redisplay_pending;
|
||||
|
||||
int create_xwin(const char *title, int xsz, int ysz)
|
||||
{
|
||||
int scr;
|
||||
Window root;
|
||||
XVisualInfo *vis;
|
||||
XSetWindowAttributes xattr;
|
||||
unsigned int events;
|
||||
XClassHint class_hint;
|
||||
|
||||
int attr[] = {
|
||||
GLX_RGBA, GLX_DOUBLEBUFFER,
|
||||
GLX_RED_SIZE, 8,
|
||||
GLX_GREEN_SIZE, 8,
|
||||
GLX_BLUE_SIZE, 8,
|
||||
GLX_DEPTH_SIZE, 24,
|
||||
None
|
||||
};
|
||||
|
||||
wm_prot = XInternAtom(dpy, "WM_PROTOCOLS", False);
|
||||
wm_del_win = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
|
||||
|
||||
scr = DefaultScreen(dpy);
|
||||
root = RootWindow(dpy, scr);
|
||||
|
||||
if(!(vis = glXChooseVisual(dpy, scr, attr))) {
|
||||
fprintf(stderr, "requested GLX visual is not available\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
if(!(ctx = glXCreateContext(dpy, vis, 0, True))) {
|
||||
fprintf(stderr, "failed to create GLX context\n");
|
||||
XFree(vis);
|
||||
return -1;
|
||||
}
|
||||
|
||||
xattr.background_pixel = xattr.border_pixel = BlackPixel(dpy, scr);
|
||||
xattr.colormap = XCreateColormap(dpy, root, vis->visual, AllocNone);
|
||||
|
||||
if(!(win = XCreateWindow(dpy, root, 0, 0, xsz, ysz, 0, vis->depth, InputOutput,
|
||||
vis->visual, CWColormap | CWBackPixel | CWBorderPixel, &xattr))) {
|
||||
fprintf(stderr, "failed to create X window\n");
|
||||
return -1;
|
||||
}
|
||||
XFree(vis);
|
||||
|
||||
/* set the window event mask */
|
||||
events = ExposureMask | StructureNotifyMask | KeyPressMask | KeyReleaseMask |
|
||||
ButtonReleaseMask | ButtonPressMask | PointerMotionMask;
|
||||
XSelectInput(dpy, win, events);
|
||||
|
||||
XSetWMProtocols(dpy, win, &wm_del_win, 1);
|
||||
|
||||
set_window_title(title);
|
||||
|
||||
class_hint.res_name = "libspnav_example";
|
||||
class_hint.res_class = "libspnav_example";
|
||||
XSetClassHint(dpy, win, &class_hint);
|
||||
|
||||
if(glXMakeCurrent(dpy, win, ctx) == False) {
|
||||
fprintf(stderr, "glXMakeCurrent failed\n");
|
||||
glXDestroyContext(dpy, ctx);
|
||||
XDestroyWindow(dpy, win);
|
||||
return -1;
|
||||
}
|
||||
|
||||
XMapWindow(dpy, win);
|
||||
XFlush(dpy);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void destroy_xwin(void)
|
||||
{
|
||||
glXDestroyContext(dpy, ctx);
|
||||
XDestroyWindow(dpy, win);
|
||||
glXMakeCurrent(dpy, None, 0);
|
||||
}
|
||||
|
||||
void set_window_title(const char *title)
|
||||
{
|
||||
XTextProperty wm_name;
|
||||
|
||||
XStringListToTextProperty((char**)&title, 1, &wm_name);
|
||||
XSetWMName(dpy, win, &wm_name);
|
||||
XSetWMIconName(dpy, win, &wm_name);
|
||||
XFree(wm_name.value);
|
||||
}
|
||||
|
||||
|
||||
int handle_xevent(XEvent *xev)
|
||||
{
|
||||
int x, y;
|
||||
KeySym sym;
|
||||
|
||||
switch(xev->type) {
|
||||
case Expose:
|
||||
redisplay_pending = 1;
|
||||
break;
|
||||
|
||||
case ClientMessage:
|
||||
if(xev->xclient.message_type == wm_prot) {
|
||||
if(xev->xclient.data.l[0] == wm_del_win) {
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
break;
|
||||
|
||||
case KeyPress:
|
||||
sym = XLookupKeysym((XKeyEvent*)&xev->xkey, 0);
|
||||
if((sym & 0xff) == 27) {
|
||||
return 1;
|
||||
}
|
||||
break;
|
||||
|
||||
case ConfigureNotify:
|
||||
x = xev->xconfigure.width;
|
||||
y = xev->xconfigure.height;
|
||||
|
||||
reshape(x, y);
|
||||
break;
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -0,0 +1,14 @@
|
|||
#ifndef XWIN_H_
|
||||
#define XWIN_H_
|
||||
|
||||
#include <X11/Xlib.h>
|
||||
|
||||
extern Display *dpy;
|
||||
extern Window win;
|
||||
extern int win_width, win_height;
|
||||
extern int redisplay_pending;
|
||||
|
||||
int create_xwin(const char *title, int xsz, int ysz);
|
||||
void destroy_xwin(void);
|
||||
|
||||
#endif /* XWIN_H_ */
|
||||
Ładowanie…
Reference in New Issue