From 74b32cf95068bf04d84d080dc48dc8e89707562f Mon Sep 17 00:00:00 2001 From: John Tsiombikas Date: Mon, 25 May 2020 17:55:00 +0300 Subject: [PATCH] MiniGLUT initial commit --- .gitignore | 4 + COPYING | 674 +++++++++++++++++++++++++++++++++++++++++++++++ Makefile | 13 + README.md | 76 ++++++ miniglut.c | 855 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ miniglut.h | 146 +++++++++++ test.c | 109 ++++++++ 7 files changed, 1877 insertions(+) create mode 100644 .gitignore create mode 100644 COPYING create mode 100644 Makefile create mode 100644 README.md create mode 100644 miniglut.c create mode 100644 miniglut.h create mode 100644 test.c diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..0932ecf --- /dev/null +++ b/.gitignore @@ -0,0 +1,4 @@ +*.o +*.d +*.swp +test diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..f288702 --- /dev/null +++ b/COPYING @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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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 +. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..655a7d3 --- /dev/null +++ b/Makefile @@ -0,0 +1,13 @@ +src = miniglut.c test.c +obj = $(src:.c=.o) +bin = test + +CFLAGS = -pedantic -Wall -g +LDFLAGS = -lX11 -lGL -lm + +$(bin): $(obj) + $(CC) -o $@ $(obj) $(LDFLAGS) + +.PHONY: clean +clean: + rm -f $(obj) $(bin) diff --git a/README.md b/README.md new file mode 100644 index 0000000..5fa2bec --- /dev/null +++ b/README.md @@ -0,0 +1,76 @@ +MiniGLUT +======== +MiniGLUT is a subset of GLUT (or more precisely a subset of FreeGLUT) +implemented in a single C source file, without any non-essential dependencies, +not even the C library. + +You can use MiniGLUT by simply dropping two files: `miniglut.h` and `miniglut.c` +into your project source tree, or by building MiniGLUT as a static library and +linking with it. + +MiniGLUT does not intend to replace a proper GLUT library like FreeGLUT for +hacking OpenGL experiments and small programs. The purpose of MiniGLUT is to +replace a proper GLUT library when it's time for release, in order to minimize +runtime dependencies of the resulting binary. + +A second reason is for porting UNIX OpenGL programs to Windows, especially when +using the microsoft compiler, where setting up and linking with a proper +3rd-party library like FreeGLUT is an ordeal in itself. Even more so if you +decide to statically link, at which point you need to deal with the whole "MSVC +runtime" chaos. Since MiniGLUT does not call any C library functions, even if +you decide to link it as a static library, it will not affect your choice of +MSVC runtime library. + +Missing features +---------------- +MiniGLUT being a subset of GLUT, is missing a number of features. Some of them +on purpose to keep it minimal, and some of them because I didn't happen to use +them in a program I wanted to link with MiniGLUT yet. + +Missing GLUT features: + - Only supported systems are UNIX with X11 (GLX) and Windows (WGL). + - Indexed color contexts. + - Multiple windows. + - Subwindows. + - Overlays. + - Game mode (video mode switching). + - Menus. + - Font rendering. + - Some of the primitives. + - Buttons and Dials callbacks. + - Tablet callbacks. + - Spaceball callbacks are only implemented on UNIX/X11. + - Timer callback. + +Missing FreeGLUT features: + - Mobile callbacks. + - Context version and profile selection and other context flags. + - Window close actions. + - Multi-touch/multi-pointer callbacks. + - User-pointer callbacks. + - Joystick callbacks. + - More missing primitives. + +If wish to let me know how much you need one of the missing features, or even +better if you are volunteering to implement it yourself, contact me through +through email at: nuclear@member.fsf.org + +Only plain-text emails, hard-wrapped at 72 columns will be accepted. + +License +------- +Copyright (C) 2020 John Tsiombikas + +MiniGLUT is free software. Feel free to use, modify and/or redistribute it, +under the terms of the GNU General Public License v3, or at your option any +newer version published by the Free Software Foundation. See COPYING for +details. + +The intention is not to dictate a specific free software license (GPL) but to +shut the door to proprietary programs. If you want to use MiniGLUT in a free +software project with an incompatible free software license, contact me, and we +will figure out a way to enable that. Usually only other copyleft licenses are +incompatible with the GPL. There's no issue with combining GPL code with code +using other non-copyleft free software licenses like MIT/X11, 3-clause BSD, and +so on. +See: https://www.gnu.org/licenses/license-list.en.html#GPLIncompatibleLicenses diff --git a/miniglut.c b/miniglut.c new file mode 100644 index 0000000..788d8a1 --- /dev/null +++ b/miniglut.c @@ -0,0 +1,855 @@ +/* +MiniGLUT - minimal GLUT subset without dependencies +Copyright (C) 2020 John Tsiombikas + +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 . + */ +#ifdef MINIGLUT_USE_LIBC +#include +#endif + +#if defined(__unix__) + +#include +#include +#include +#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 +#define BUILD_WIN32 + +static HWND win; +static HDC dc; +static HGLRC ctx; + +#else +#error unsupported platform +#endif + +#include +#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 + +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 */ diff --git a/miniglut.h b/miniglut.h new file mode 100644 index 0000000..4f6a70e --- /dev/null +++ b/miniglut.h @@ -0,0 +1,146 @@ +/* +MiniGLUT - minimal GLUT subset without dependencies +Copyright (C) 2020 John Tsiombikas + +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 . + */ +#ifndef MINIGLUT_H_ +#define MINIGLUT_H_ + +#ifdef _WIN32 +#define WIN32_LEAN_AND_MEAN 1 +#include +#endif +#include + +/* mode flags for glutInitDisplayMode */ +#define GLUT_RGB 0 +#define GLUT_RGBA 0 +#define GLUT_INDEX 0x001 +#define GLUT_SINGLE 0 +#define GLUT_DOUBLE 0x002 +#define GLUT_ACCUM 0x004 +#define GLUT_ALPHA 0x008 +#define GLUT_DEPTH 0x010 +#define GLUT_STENCIL 0x020 +#define GLUT_STEREO 0x040 +#define GLUT_MULTISAMPLE 0x100 +#define GLUT_SRGB 0x200 + +enum { GLUT_LEFT_BUTTON, GLUT_MIDDLE_BUTTON, GLUT_RIGHT_BUTTON }; +enum { GLUT_UP, GLUT_DOWN }; +enum { GLUT_NOT_VISIBLE, GLUT_VISIBLE }; +enum { GLUT_LEFT, GLUT_ENTERED }; + +/* cursors */ +enum { + GLUT_CURSOR_INHERIT, + GLUT_CURSOR_LEFT_ARROW, + GLUT_CURSOR_NONE +}; + +/* glutGet */ +enum { + GLUT_WINDOW_X, + GLUT_WINDOW_Y, + GLUT_WINDOW_WIDTH, + GLUT_WINDOW_HEIGHT, + GLUT_WINDOW_BUFFER_SIZE, + GLUT_WINDOW_STENCIL_SIZE, + GLUT_WINDOW_DEPTH_SIZE, + GLUT_WINDOW_RED_SIZE, + GLUT_WINDOW_GREEN_SIZE, + GLUT_WINDOW_BLUE_SIZE, + GLUT_WINDOW_ALPHA_SIZE, + GLUT_WINDOW_DOUBLEBUFFER, + GLUT_WINDOW_RGBA, + GLUT_WINDOW_NUM_SAMPLES, + GLUT_WINDOW_STEREO, + GLUT_WINDOW_SRGB, + GLUT_WINDOW_CURSOR, + GLUT_SCREEN_WIDTH, + GLUT_SCREEN_HEIGHT, + GLUT_INIT_DISPLAY_MODE, + GLUT_INIT_WINDOW_X, + GLUT_INIT_WINDOW_Y, + GLUT_INIT_WINDOW_WIDTH, + GLUT_INIT_WINDOW_HEIGHT, + GLUT_ELAPSED_TIME +}; + +/* returned by glutGetModifiers */ +#define GLUT_ACTIVE_SHIFT 1 +#define GLUT_ACTIVE_CTRL 2 +#define GLUT_ACTIVE_ALT 4 + +typedef void (*glut_cb)(void); +typedef void (*glut_cb_reshape)(int x, int y); +typedef void (*glut_cb_state)(int state); +typedef void (*glut_cb_keyb)(unsigned char key, int x, int y); +typedef void (*glut_cb_special)(int key, int x, int y); +typedef void (*glut_cb_mouse)(int bn, int state, int x, int y); +typedef void (*glut_cb_motion)(int x, int y); +typedef void (*glut_cb_sbmotion)(int x, int y, int z); +typedef void (*glut_cb_sbbutton)(int bn, int state); + + +void glutInit(int *argc, char **argv); +void glutInitWindowPosition(int x, int y); +void glutInitWindowSize(int xsz, int ysz); +void glutInitDisplayMode(unsigned int mode); +void glutCreateWindow(const char *title); + +void glutExit(void); +void glutMainLoop(void); +void glutMainLoopEvent(void); + +void glutPostRedisplay(void); +void glutSwapBuffers(void); +void glutPositionWindow(int x, int y); +void glutReshapeWindow(int xsz, int ysz); +void glutFullScreen(void); +void glutSetWindowTitle(const char *title); +void glutSetIconTitle(const char *title); +void glutSetCursor(int cursor); + +void glutIdleFunc(glut_cb func); +void glutDisplayFunc(glut_cb func); +void glutReshapeFunc(glut_cb_reshape func); +void glutVisibilityFunc(glut_cb_state func); +void glutEntryFunc(glut_cb_state func); +void glutKeyboardFunc(glut_cb_keyb func); +void glutKeyboardUpFunc(glut_cb_keyb func); +void glutSpecialFunc(glut_cb_special func); +void glutSpecialUpFunc(glut_cb_special func); +void glutMouseFunc(glut_cb_mouse func); +void glutMotionFunc(glut_cb_motion func); +void glutPassiveMotionFunc(glut_cb_motion func); +void glutSpaceballMotionFunc(glut_cb_sbmotion func); +void glutSpaceballRotateFunc(glut_cb_sbmotion func); +void glutSpaceballBittonFunc(glut_cb_sbbutton func); + +int glutGet(unsigned int s); +int glutGetModifiers(void); +int glutExtensionSupported(char *ext); + +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); + +#endif /* MINIGLUT_H_ */ diff --git a/test.c b/test.c new file mode 100644 index 0000000..3ac8270 --- /dev/null +++ b/test.c @@ -0,0 +1,109 @@ +#include "miniglut.h" + +void display(void); +void reshape(int x, int y); +void keypress(unsigned char key, int x, int y); +void mouse(int bn, int st, int x, int y); +void motion(int x, int y); + +float cam_theta, cam_phi = 25, cam_dist = 8; +int mouse_x, mouse_y; +int bnstate[8]; + +int main(int argc, char **argv) +{ + glutInit(&argc, argv); + glutInitWindowSize(1024, 768); + glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE); + glutCreateWindow("miniglut test"); + + glutDisplayFunc(display); + glutReshapeFunc(reshape); + glutKeyboardFunc(keypress); + glutMouseFunc(mouse); + glutMotionFunc(motion); + + glEnable(GL_DEPTH_TEST); + glEnable(GL_CULL_FACE); + glEnable(GL_LIGHTING); + glEnable(GL_LIGHT0); + + glutMainLoop(); + return 0; +} + + +void display(void) +{ + float lpos[] = {-1, 2, 3, 0}; + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + glTranslatef(0, 0, -cam_dist); + glRotatef(cam_phi, 1, 0, 0); + glRotatef(cam_theta, 0, 1, 0); + + glLightfv(GL_LIGHT0, GL_POSITION, lpos); + + glutSolidTorus(0.3, 1, 16, 24); + + glBegin(GL_QUADS); + glNormal3f(0, 1, 0); + glVertex3f(-5, -1.3, 5); + glVertex3f(5, -1.3, 5); + glVertex3f(5, -1.3, -5); + glVertex3f(-5, -1.3, -5); + glEnd(); + + glutSwapBuffers(); +} + +#define ZNEAR 0.5f +void reshape(int x, int y) +{ + float vsz, aspect = (float)x / (float)y; + glViewport(0, 0, x, y); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + vsz = 0.4663f * ZNEAR; + glFrustum(-aspect * vsz, aspect * vsz, -vsz, vsz, 0.5, 500.0); +} + +void keypress(unsigned char key, int x, int y) +{ + if(key == 27 || key == 'q') { + glutExit(); + } +} + +void mouse(int bn, int st, int x, int y) +{ + int bidx = bn - GLUT_LEFT_BUTTON; + bnstate[bidx] = st == GLUT_DOWN; + mouse_x = x; + mouse_y = y; +} + +void motion(int x, int y) +{ + int dx = x - mouse_x; + int dy = y - mouse_y; + mouse_x = x; + mouse_y = y; + + if(!(dx | dy)) return; + + if(bnstate[0]) { + cam_theta += dx * 0.5; + cam_phi += dy * 0.5; + if(cam_phi < -90) cam_phi = -90; + if(cam_phi > 90) cam_phi = 90; + glutPostRedisplay(); + } + if(bnstate[2]) { + cam_dist += dy * 0.1; + if(cam_dist < 0) cam_dist = 0; + glutPostRedisplay(); + } +} -- 1.7.10.4