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+ GNU GENERAL PUBLIC LICENSE
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+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
--- /dev/null
+/*
+MiniGLUT - minimal GLUT subset without dependencies
+Copyright (C) 2020 John Tsiombikas <nuclear@member.fsf.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+#ifdef MINIGLUT_USE_LIBC
+#include <stdlib.h>
+#endif
+
+#if defined(__unix__)
+
+#include <X11/Xlib.h>
+#include <X11/cursorfont.h>
+#include <GL/glx.h>
+#define BUILD_X11
+
+#ifndef GLX_SAMPLE_BUFFERS_ARB
+#define GLX_SAMPLE_BUFFERS_ARB 100000
+#define GLX_SAMPLES_ARB 100001
+#endif
+#ifndef GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB
+#define GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB 0x20b2
+#endif
+
+static Display *dpy;
+static Window win, root;
+static int scr;
+static GLXContext ctx;
+static Atom xa_wm_proto, xa_wm_del_win;
+static unsigned int evmask;
+
+#elif defined(_WIN32)
+
+#include <windows.h>
+#define BUILD_WIN32
+
+static HWND win;
+static HDC dc;
+static HGLRC ctx;
+
+#else
+#error unsupported platform
+#endif
+
+#include <GL/gl.h>
+#include "miniglut.h"
+
+struct ctx_info {
+ int rsize, gsize, bsize, asize;
+ int zsize, ssize;
+ int dblbuf;
+ int samples;
+ int stereo;
+ int srgb;
+};
+
+static void create_window(const char *title);
+static void get_window_pos(Window win, int *x, int *y);
+static void get_window_size(Window win, int *w, int *h);
+static void get_screen_size(Window win, int *scrw, int *scrh);
+
+static long get_msec(void);
+static void panic(const char *msg);
+static void sys_exit(int status);
+static int sys_write(int fd, const void *buf, int count);
+
+
+static int init_x, init_y, init_width = 256, init_height = 256;
+static unsigned int init_mode;
+
+static struct ctx_info ctx_info;
+static int cur_cursor = GLUT_CURSOR_INHERIT;
+
+static glut_cb cb_display;
+static glut_cb cb_idle;
+static glut_cb_reshape cb_reshape;
+static glut_cb_state cb_vis, cb_entry;
+static glut_cb_keyb cb_keydown, cb_keyup;
+static glut_cb_special cb_skeydown, cb_skeyup;
+static glut_cb_mouse cb_mouse;
+static glut_cb_motion cb_motion, cb_passive;
+static glut_cb_sbmotion cb_sball_motion, cb_sball_rotate;
+static glut_cb_sbbutton cb_sball_button;
+
+static int win_width, win_height;
+static int mapped;
+static int quit;
+static int upd_pending, reshape_pending;
+static int modstate;
+
+
+void glutInit(int *argc, char **argv)
+{
+#ifdef BUILD_X11
+ if(!(dpy = XOpenDisplay(0))) {
+ panic("Failed to connect to the X server\n");
+ }
+ scr = DefaultScreen(dpy);
+ root = RootWindow(dpy, scr);
+ xa_wm_proto = XInternAtom(dpy, "WM_PROTOCOLS", False);
+ xa_wm_del_win = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
+
+ evmask = ExposureMask | StructureNotifyMask;
+#endif
+}
+
+void glutInitWindowPosition(int x, int y)
+{
+ init_x = x;
+ init_y = y;
+}
+
+void glutInitWindowSize(int xsz, int ysz)
+{
+ init_width = xsz;
+ init_height = ysz;
+}
+
+void glutInitDisplayMode(unsigned int mode)
+{
+ init_mode = mode;
+}
+
+void glutCreateWindow(const char *title)
+{
+ create_window(title);
+}
+
+void glutExit(void)
+{
+ quit = 1;
+}
+
+void glutMainLoop(void)
+{
+ while(!quit) {
+ glutMainLoopEvent();
+ }
+}
+
+void glutPostRedisplay(void)
+{
+ upd_pending = 1;
+}
+
+#define UPD_EVMASK(x) \
+ do { \
+ if(func) { \
+ evmask |= x; \
+ } else { \
+ evmask &= ~(x); \
+ } \
+ if(win) XSelectInput(dpy, win, evmask); \
+ } while(0)
+
+
+void glutIdleFunc(glut_cb func)
+{
+ cb_idle = func;
+}
+
+void glutDisplayFunc(glut_cb func)
+{
+ cb_display = func;
+}
+
+void glutReshapeFunc(glut_cb_reshape func)
+{
+ cb_reshape = func;
+}
+
+void glutVisibilityFunc(glut_cb_state func)
+{
+ cb_vis = func;
+#ifdef BUILD_X11
+ UPD_EVMASK(VisibilityChangeMask);
+#endif
+}
+
+void glutEntryFunc(glut_cb_state func)
+{
+ cb_entry = func;
+#ifdef BUILD_X11
+ UPD_EVMASK(EnterWindowMask | LeaveWindowMask);
+#endif
+}
+
+void glutKeyboardFunc(glut_cb_keyb func)
+{
+ cb_keydown = func;
+#ifdef BUILD_X11
+ UPD_EVMASK(KeyPressMask);
+#endif
+}
+
+void glutKeyboardUpFunc(glut_cb_keyb func)
+{
+ cb_keyup = func;
+#ifdef BUILD_X11
+ UPD_EVMASK(KeyReleaseMask);
+#endif
+}
+
+void glutSpecialFunc(glut_cb_special func)
+{
+ cb_skeydown = func;
+#ifdef BUILD_X11
+ UPD_EVMASK(KeyPressMask);
+#endif
+}
+
+void glutSpecialUpFunc(glut_cb_special func)
+{
+ cb_skeyup = func;
+#ifdef BUILD_X11
+ UPD_EVMASK(KeyReleaseMask);
+#endif
+}
+
+void glutMouseFunc(glut_cb_mouse func)
+{
+ cb_mouse = func;
+#ifdef BUILD_X11
+ UPD_EVMASK(ButtonPressMask | ButtonReleaseMask);
+#endif
+}
+
+void glutMotionFunc(glut_cb_motion func)
+{
+ cb_motion = func;
+#ifdef BUILD_X11
+ UPD_EVMASK(ButtonMotionMask);
+#endif
+}
+
+void glutPassiveMotionFunc(glut_cb_motion func)
+{
+ cb_passive = func;
+#ifdef BUILD_X11
+ UPD_EVMASK(PointerMotionMask);
+#endif
+}
+
+void glutSpaceballMotionFunc(glut_cb_sbmotion func)
+{
+ cb_sball_motion = func;
+}
+
+void glutSpaceballRotateFunc(glut_cb_sbmotion func)
+{
+ cb_sball_rotate = func;
+}
+
+void glutSpaceballBittonFunc(glut_cb_sbbutton func)
+{
+ cb_sball_button = func;
+}
+
+int glutGet(unsigned int s)
+{
+ int x, y;
+ switch(s) {
+ case GLUT_WINDOW_X:
+ get_window_pos(win, &x, &y);
+ return x;
+ case GLUT_WINDOW_Y:
+ get_window_pos(win, &x, &y);
+ return y;
+ case GLUT_WINDOW_WIDTH:
+ get_window_size(win, &x, &y);
+ return x;
+ case GLUT_WINDOW_HEIGHT:
+ get_window_size(win, &x, &y);
+ return y;
+ case GLUT_WINDOW_BUFFER_SIZE:
+ return ctx_info.rsize + ctx_info.gsize + ctx_info.bsize + ctx_info.asize;
+ case GLUT_WINDOW_STENCIL_SIZE:
+ return ctx_info.ssize;
+ case GLUT_WINDOW_DEPTH_SIZE:
+ return ctx_info.zsize;
+ case GLUT_WINDOW_RED_SIZE:
+ return ctx_info.rsize;
+ case GLUT_WINDOW_GREEN_SIZE:
+ return ctx_info.gsize;
+ case GLUT_WINDOW_BLUE_SIZE:
+ return ctx_info.bsize;
+ case GLUT_WINDOW_ALPHA_SIZE:
+ return ctx_info.asize;
+ case GLUT_WINDOW_DOUBLEBUFFER:
+ return ctx_info.dblbuf;
+ case GLUT_WINDOW_RGBA:
+ return 1;
+ case GLUT_WINDOW_NUM_SAMPLES:
+ return ctx_info.samples;
+ case GLUT_WINDOW_STEREO:
+ return ctx_info.stereo;
+ case GLUT_WINDOW_SRGB:
+ return ctx_info.srgb;
+ case GLUT_WINDOW_CURSOR:
+ return cur_cursor;
+ case GLUT_SCREEN_WIDTH:
+ get_screen_size(win, &x, &y);
+ return x;
+ case GLUT_SCREEN_HEIGHT:
+ get_screen_size(win, &x, &y);
+ return y;
+ case GLUT_INIT_DISPLAY_MODE:
+ return init_mode;
+ case GLUT_INIT_WINDOW_X:
+ return init_x;
+ case GLUT_INIT_WINDOW_Y:
+ return init_y;
+ case GLUT_INIT_WINDOW_WIDTH:
+ return init_width;
+ case GLUT_INIT_WINDOW_HEIGHT:
+ return init_height;
+ case GLUT_ELAPSED_TIME:
+ return get_msec();
+ default:
+ break;
+ }
+ return 0;
+}
+
+int glutGetModifiers(void)
+{
+ return modstate;
+}
+
+static int is_space(int c)
+{
+ return c == ' ' || c == '\t' || c == '\v' || c == '\n' || c == '\r';
+}
+
+static const char *skip_space(const char *s)
+{
+ while(*s && is_space(*s)) s++;
+ return s;
+}
+
+int glutExtensionSupported(char *ext)
+{
+ const char *str, *eptr;
+
+ if(!(str = (const char*)glGetString(GL_EXTENSIONS))) {
+ return 0;
+ }
+
+ while(*str) {
+ str = skip_space(str);
+ eptr = skip_space(ext);
+ while(*str && !is_space(*str) && *eptr && *str == *eptr) {
+ str++;
+ eptr++;
+ }
+ if((!*str || is_space(*str)) && !*eptr) {
+ return 1;
+ }
+ while(*str && !is_space(*str)) str++;
+ }
+
+ return 0;
+}
+
+/* TODO */
+void glutSolidSphere(float rad)
+{
+}
+
+void glutWireSphere(float rad)
+{
+}
+
+void glutSolidCube(float sz)
+{
+}
+
+void glutWireCube(float sz)
+{
+}
+
+void glutSolidTorus(float inner_rad, float outer_rad, float sides, float rings)
+{
+}
+
+void glutWireTorus(float inner_rad, float outer_rad, float sides, float rings)
+{
+}
+
+void glutSolidTeapot(float size)
+{
+}
+
+void glutWireTeapot(float size)
+{
+}
+
+
+#ifdef BUILD_X11
+static void handle_event(XEvent *ev);
+
+void glutMainLoopEvent(void)
+{
+ XEvent ev;
+
+ if(!cb_display) {
+ panic("display callback not set");
+ }
+
+ for(;;) {
+ if(!upd_pending && !cb_idle) {
+ XNextEvent(dpy, &ev);
+ handle_event(&ev);
+ if(quit) return;
+ }
+ while(XPending(dpy)) {
+ XNextEvent(dpy, &ev);
+ handle_event(&ev);
+ if(quit) return;
+ }
+
+ if(cb_idle) {
+ cb_idle();
+ }
+
+ if(upd_pending && mapped) {
+ upd_pending = 0;
+ cb_display();
+ }
+ }
+}
+
+static KeySym translate_keysym(KeySym sym)
+{
+ switch(sym) {
+ case XK_Escape:
+ return 27;
+ case XK_BackSpace:
+ return '\b';
+ case XK_Linefeed:
+ return '\r';
+ case XK_Return:
+ return '\n';
+ case XK_Delete:
+ return 127;
+ case XK_Tab:
+ return '\t';
+ default:
+ break;
+ }
+ return sym;
+}
+
+static void handle_event(XEvent *ev)
+{
+ KeySym sym;
+
+ switch(ev->type) {
+ case MapNotify:
+ mapped = 1;
+ break;
+ case UnmapNotify:
+ mapped = 0;
+ break;
+ case ConfigureNotify:
+ if(cb_reshape && (ev->xconfigure.width != win_width || ev->xconfigure.height != win_height)) {
+ win_width = ev->xconfigure.width;
+ win_height = ev->xconfigure.height;
+ cb_reshape(ev->xconfigure.width, ev->xconfigure.height);
+ }
+ break;
+
+ case ClientMessage:
+ if(ev->xclient.message_type == xa_wm_proto) {
+ if(ev->xclient.data.l[0] == xa_wm_del_win) {
+ quit = 1;
+ }
+ }
+ break;
+
+ case Expose:
+ upd_pending = 1;
+ break;
+
+ case KeyPress:
+ case KeyRelease:
+ modstate = ev->xkey.state & (ShiftMask | ControlMask | Mod1Mask);
+ if(!(sym = XLookupKeysym(&ev->xkey, 0))) {
+ break;
+ }
+ sym = translate_keysym(sym);
+ if(sym < 256) {
+ if(ev->type == KeyPress) {
+ if(cb_keydown) cb_keydown((unsigned char)sym, ev->xkey.x, ev->xkey.y);
+ } else {
+ if(cb_keyup) cb_keyup((unsigned char)sym, ev->xkey.x, ev->xkey.y);
+ }
+ } else {
+ if(ev->type == KeyPress) {
+ if(cb_skeydown) cb_skeydown(sym, ev->xkey.x, ev->xkey.y);
+ } else {
+ if(cb_skeyup) cb_skeyup(sym, ev->xkey.x, ev->xkey.y);
+ }
+ }
+ break;
+
+ case ButtonPress:
+ case ButtonRelease:
+ modstate = ev->xbutton.state & (ShiftMask | ControlMask | Mod1Mask);
+ if(cb_mouse) {
+ int bn = ev->xbutton.button - Button1;
+ cb_mouse(bn, ev->type == ButtonPress ? GLUT_DOWN : GLUT_UP,
+ ev->xbutton.x, ev->xbutton.y);
+ }
+ break;
+
+ case MotionNotify:
+ if(ev->xmotion.state & (Button1Mask | Button2Mask | Button3Mask | Button4Mask | Button5Mask)) {
+ if(cb_motion) cb_motion(ev->xmotion.x, ev->xmotion.y);
+ } else {
+ if(cb_passive) cb_passive(ev->xmotion.x, ev->xmotion.y);
+ }
+ break;
+
+ case VisibilityNotify:
+ if(cb_vis) {
+ cb_vis(ev->xvisibility.state == VisibilityFullyObscured ? GLUT_NOT_VISIBLE : GLUT_VISIBLE);
+ }
+ break;
+ case EnterNotify:
+ if(cb_entry) cb_entry(GLUT_ENTERED);
+ break;
+ case LeaveNotify:
+ if(cb_entry) cb_entry(GLUT_LEFT);
+ break;
+ }
+}
+
+void glutSwapBuffers(void)
+{
+ glXSwapBuffers(dpy, win);
+}
+
+void glutPositionWindow(int x, int y)
+{
+ XMoveWindow(dpy, win, x, y);
+}
+
+void glutReshapeWindow(int xsz, int ysz)
+{
+ XResizeWindow(dpy, win, xsz, ysz);
+}
+
+void glutFullScreen(void)
+{
+ /* TODO */
+}
+
+void glutSetWindowTitle(const char *title)
+{
+ XTextProperty tprop;
+ if(!XStringListToTextProperty((char**)&title, 1, &tprop)) {
+ return;
+ }
+ XSetWMName(dpy, win, &tprop);
+ XFree(tprop.value);
+}
+
+void glutSetIconTitle(const char *title)
+{
+ XTextProperty tprop;
+ if(!XStringListToTextProperty((char**)&title, 1, &tprop)) {
+ return;
+ }
+ XSetWMIconName(dpy, win, &tprop);
+ XFree(tprop.value);
+}
+
+void glutSetCursor(int cidx)
+{
+ Cursor cur = None;
+
+ switch(cidx) {
+ case GLUT_CURSOR_LEFT_ARROW:
+ cur = XCreateFontCursor(dpy, XC_left_ptr);
+ break;
+ case GLUT_CURSOR_INHERIT:
+ break;
+ case GLUT_CURSOR_NONE:
+ /* TODO */
+ default:
+ return;
+ }
+
+ XDefineCursor(dpy, win, cur);
+ cur_cursor = cidx;
+}
+
+static XVisualInfo *choose_visual(unsigned int mode)
+{
+ XVisualInfo *vi;
+ int attr[32] = {
+ GLX_RGBA,
+ GLX_DOUBLEBUFFER,
+ GLX_RED_SIZE, 4,
+ GLX_GREEN_SIZE, 4,
+ GLX_BLUE_SIZE, 4
+ };
+ int *aptr = attr + 8;
+ int *samples = 0;
+
+ if(mode & GLUT_ALPHA) {
+ *aptr++ = GLX_ALPHA_SIZE;
+ *aptr++ = 4;
+ }
+ if(mode & GLUT_DEPTH) {
+ *aptr++ = GLX_DEPTH_SIZE;
+ *aptr++ = 16;
+ }
+ if(mode & GLUT_STENCIL) {
+ *aptr++ = GLX_STENCIL_SIZE;
+ *aptr++ = 1;
+ }
+ if(mode & GLUT_ACCUM) {
+ *aptr++ = GLX_ACCUM_RED_SIZE; *aptr++ = 1;
+ *aptr++ = GLX_ACCUM_GREEN_SIZE; *aptr++ = 1;
+ *aptr++ = GLX_ACCUM_BLUE_SIZE; *aptr++ = 1;
+ }
+ if(mode & GLUT_STEREO) {
+ *aptr++ = GLX_STEREO;
+ }
+ if(mode & GLUT_SRGB) {
+ *aptr++ = GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB;
+ }
+ if(mode & GLUT_MULTISAMPLE) {
+ *aptr++ = GLX_SAMPLE_BUFFERS_ARB;
+ *aptr++ = 1;
+ *aptr++ = GLX_SAMPLES_ARB;
+ samples = aptr;
+ *aptr++ = 32;
+ }
+ *aptr++ = None;
+
+ if(!samples) {
+ return glXChooseVisual(dpy, scr, attr);
+ }
+ while(!(vi = glXChooseVisual(dpy, scr, attr)) && *samples) {
+ *samples >>= 1;
+ if(!*samples) {
+ aptr[-3] = None;
+ }
+ }
+ return vi;
+}
+
+static void create_window(const char *title)
+{
+ XSetWindowAttributes xattr;
+ XVisualInfo *vi;
+ unsigned int xattr_mask;
+ unsigned int mode = init_mode;
+
+ if(!(vi = choose_visual(mode))) {
+ mode &= ~GLUT_SRGB;
+ if(!(vi = choose_visual(mode))) {
+ panic("Failed to find compatible visual\n");
+ }
+ }
+
+ if(!(ctx = glXCreateContext(dpy, vi, 0, True))) {
+ XFree(vi);
+ panic("Failed to create OpenGL context\n");
+ }
+
+ glXGetConfig(dpy, vi, GLX_RED_SIZE, &ctx_info.rsize);
+ glXGetConfig(dpy, vi, GLX_GREEN_SIZE, &ctx_info.gsize);
+ glXGetConfig(dpy, vi, GLX_BLUE_SIZE, &ctx_info.bsize);
+ glXGetConfig(dpy, vi, GLX_ALPHA_SIZE, &ctx_info.asize);
+ glXGetConfig(dpy, vi, GLX_DEPTH_SIZE, &ctx_info.zsize);
+ glXGetConfig(dpy, vi, GLX_STENCIL_SIZE, &ctx_info.ssize);
+ glXGetConfig(dpy, vi, GLX_DOUBLEBUFFER, &ctx_info.dblbuf);
+ glXGetConfig(dpy, vi, GLX_STEREO, &ctx_info.stereo);
+ glXGetConfig(dpy, vi, GLX_SAMPLES_ARB, &ctx_info.samples);
+ glXGetConfig(dpy, vi, GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB, &ctx_info.srgb);
+
+ xattr.background_pixel = BlackPixel(dpy, scr);
+ xattr.colormap = XCreateColormap(dpy, root, vi->visual, AllocNone);
+ xattr_mask = CWBackPixel | CWColormap;
+ if(!(win = XCreateWindow(dpy, root, init_x, init_y, init_width, init_height, 0,
+ vi->depth, InputOutput, vi->visual, xattr_mask, &xattr))) {
+ XFree(vi);
+ glXDestroyContext(dpy, ctx);
+ panic("Failed to create window\n");
+ }
+ XFree(vi);
+
+ XSelectInput(dpy, win, evmask);
+
+ glutSetWindowTitle(title);
+ glutSetIconTitle(title);
+ XSetWMProtocols(dpy, win, &xa_wm_del_win, 1);
+ XMapWindow(dpy, win);
+
+ glXMakeCurrent(dpy, win, ctx);
+}
+
+static void get_window_pos(Window win, int *x, int *y)
+{
+ XWindowAttributes wattr;
+ XGetWindowAttributes(dpy, win, &wattr);
+ *x = wattr.x;
+ *y = wattr.y;
+}
+
+static void get_window_size(Window win, int *w, int *h)
+{
+ XWindowAttributes wattr;
+ XGetWindowAttributes(dpy, win, &wattr);
+ *w = wattr.width;
+ *h = wattr.height;
+}
+
+static void get_screen_size(Window win, int *scrw, int *scrh)
+{
+ XWindowAttributes wattr;
+ XGetWindowAttributes(dpy, root, &wattr);
+ *scrw = wattr.width;
+ *scrh = wattr.height;
+}
+#endif
+
+#if defined(__unix__) || defined(__APPLE__)
+#include <sys/time.h>
+
+static long get_msec(void)
+{
+ static struct timeval tv0;
+ struct timeval tv;
+
+ gettimeofday(&tv, 0);
+ if(tv0.tv_sec == 0 && tv0.tv_usec == 0) {
+ tv0 = tv;
+ return 0;
+ }
+ return (tv.tv_sec - tv0.tv_sec) * 1000 + (tv.tv_usec - tv0.tv_usec) / 1000;
+}
+#endif
+#ifdef _WIN32
+static long get_msec(void)
+{
+ static long t0;
+
+ if(!t0) {
+ t0 = timeGetTime();
+ return 0;
+ }
+ return timeGetTime() - t0;
+}
+#endif
+
+static void panic(const char *msg)
+{
+ const char *end = msg;
+ while(*end) end++;
+ sys_write(2, msg, end - msg);
+ sys_exit(1);
+}
+
+
+#ifdef MINIGLUT_USE_LIBC
+static void sys_exit(int status)
+{
+ exit(status);
+}
+
+static int sys_write(int fd, const void *buf, int count)
+{
+ return write(fd, buf, count);
+}
+#else /* !MINIGLUT_USE_LIBC */
+
+#ifdef __linux__
+
+#ifdef __x86_64__
+static void sys_exit(int status)
+{
+ asm volatile(
+ "syscall\n\t"
+ :: "a"(60), "D"(status)
+ );
+}
+static int sys_write(int fd, const void *buf, int count)
+{
+ long res;
+ asm volatile(
+ "syscall\n\t"
+ : "=a"(res)
+ : "a"(1), "D"(fd), "S"(buf), "d"(count)
+ );
+ return res;
+}
+#endif
+#ifdef __i386__
+static void sys_exit(int status)
+{
+ asm volatile(
+ "mov $1, %%eax\n\t"
+ "int $0x80\n\t"
+ :: "b"(status)
+ : "eax"
+ );
+}
+static int sys_write(int fd, const void *buf, int count)
+{
+ int res;
+ asm volatile(
+ "mov $4, %%eax\n\t"
+ "int $0x80\n\t"
+ :: "b"(fd), "c"(buf), "d"(count));
+ return res;
+}
+#endif
+
+#endif /* __linux__ */
+
+#ifdef _WIN32
+static int sys_exit(int status)
+{
+ ExitProcess(status);
+}
+static int sys_write(int fd, const void *buf, int count)
+{
+ int wrsz;
+
+ HANDLE out = GetStdHandle(fd == 1 ? STD_OUTPUT_HANDLE : STD_ERROR_HANDLE);
+ if(!WriteFile(out, buf, count, &wrsz, 0)) {
+ return -1;
+ }
+ return wrsz;
+}
+#endif /* _WIN32 */
+
+#endif /* !MINIGLUT_USE_LIBC */
projects / miniglut / commitdiff