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#include <dlfcn.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <X11/keysym.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#define PEAK_X11_LINUX "/usr/lib/libX11.so.6"
#define PEAK_LINUX_DEFAULT_WIDTH 800
#define PEAK_LINUX_DEFAULT_HEIGHT 600
typedef Display* (*XOpenDisplay_t)(const char*);
typedef int (*XCloseDisplay_t)(Display*);
typedef Window (*XCreateSimpleWindow_t)(Display*, Window, int, int, unsigned int, unsigned int, unsigned int, unsigned long, unsigned long);
typedef int (*XStoreName_t)(Display*, Window, const char*);
typedef Atom (*XInternAtom_t)(Display*, const char*, Bool);
typedef Status (*XSetWMProtocols_t)(Display*, Window, Atom*, int);
typedef int (*XSelectInput_t)(Display*, Window, long);
typedef GC (*XCreateGC_t)(Display*, Window, unsigned long, XGCValues*);
typedef XImage* (*XCreateImage_t)(Display*, Visual*, unsigned int, int, int, char*, unsigned int, unsigned int, int, int);
typedef int (*XMapRaised_t)(Display*, Window);
typedef int (*XFlush_t)(Display*);
typedef int (*XFreeGC_t)(Display*, GC);
typedef int (*XDestroyWindow_t)(Display*, Window);
typedef int (*XPending_t)(Display*);
typedef int (*XNextEvent_t)(Display*, XEvent*);
typedef KeySym (*XLookupKeysym_t)(XKeyEvent*, int);
typedef int (*XPutImage_t)(Display*, Drawable, GC, XImage*, int, int, int, int, unsigned int, unsigned int);
typedef int (*XDefaultScreen_t)(Display*);
typedef Window (*XRootWindow_t)(Display*, int);
typedef unsigned long (*XBlackPixel_t)(Display*, int);
typedef Visual* (*XDefaultVisual_t)(Display*, int);
typedef int (*XDefaultDepth_t)(Display*, int);
typedef struct {
XOpenDisplay_t XOpenDisplay;
XCloseDisplay_t XCloseDisplay;
XCreateSimpleWindow_t XCreateSimpleWindow;
XStoreName_t XStoreName;
XInternAtom_t XInternAtom;
XSetWMProtocols_t XSetWMProtocols;
XSelectInput_t XSelectInput;
XCreateGC_t XCreateGC;
XCreateImage_t XCreateImage;
XMapRaised_t XMapRaised;
XFlush_t XFlush;
XFreeGC_t XFreeGC;
XDestroyWindow_t XDestroyWindow;
XPending_t XPending;
XNextEvent_t XNextEvent;
XLookupKeysym_t XLookupKeysym;
XPutImage_t XPutImage;
XDefaultScreen_t XDefaultScreen;
XRootWindow_t XRootWindow;
XBlackPixel_t XBlackPixel;
XDefaultVisual_t XDefaultVisual;
XDefaultDepth_t XDefaultDepth;
} PeakX11Api;
static PeakX11Api peak_x11;
static int peak_load_x11(void *handle) {
peak_x11.XOpenDisplay = (XOpenDisplay_t)dlsym(handle, "XOpenDisplay");
peak_x11.XCloseDisplay = (XCloseDisplay_t)dlsym(handle, "XCloseDisplay");
peak_x11.XCreateSimpleWindow = (XCreateSimpleWindow_t)dlsym(handle, "XCreateSimpleWindow");
peak_x11.XStoreName = (XStoreName_t)dlsym(handle, "XStoreName");
peak_x11.XInternAtom = (XInternAtom_t)dlsym(handle, "XInternAtom");
peak_x11.XSetWMProtocols = (XSetWMProtocols_t)dlsym(handle, "XSetWMProtocols");
peak_x11.XSelectInput = (XSelectInput_t)dlsym(handle, "XSelectInput");
peak_x11.XCreateGC = (XCreateGC_t)dlsym(handle, "XCreateGC");
peak_x11.XCreateImage = (XCreateImage_t)dlsym(handle, "XCreateImage");
peak_x11.XMapRaised = (XMapRaised_t)dlsym(handle, "XMapRaised");
peak_x11.XFlush = (XFlush_t)dlsym(handle, "XFlush");
peak_x11.XFreeGC = (XFreeGC_t)dlsym(handle, "XFreeGC");
peak_x11.XDestroyWindow = (XDestroyWindow_t)dlsym(handle, "XDestroyWindow");
peak_x11.XPending = (XPending_t)dlsym(handle, "XPending");
peak_x11.XNextEvent = (XNextEvent_t)dlsym(handle, "XNextEvent");
peak_x11.XLookupKeysym = (XLookupKeysym_t)dlsym(handle, "XLookupKeysym");
peak_x11.XPutImage = (XPutImage_t)dlsym(handle, "XPutImage");
peak_x11.XDefaultScreen = (XDefaultScreen_t)dlsym(handle, "XDefaultScreen");
peak_x11.XRootWindow = (XRootWindow_t)dlsym(handle, "XRootWindow");
peak_x11.XBlackPixel = (XBlackPixel_t)dlsym(handle, "XBlackPixel");
peak_x11.XDefaultVisual = (XDefaultVisual_t)dlsym(handle, "XDefaultVisual");
peak_x11.XDefaultDepth = (XDefaultDepth_t)dlsym(handle, "XDefaultDepth");
if (!peak_x11.XOpenDisplay || !peak_x11.XCloseDisplay || !peak_x11.XCreateSimpleWindow ||
!peak_x11.XStoreName || !peak_x11.XInternAtom || !peak_x11.XSetWMProtocols ||
!peak_x11.XSelectInput || !peak_x11.XCreateGC || !peak_x11.XCreateImage ||
!peak_x11.XMapRaised || !peak_x11.XFlush ||
!peak_x11.XFreeGC || !peak_x11.XDestroyWindow || !peak_x11.XPending ||
!peak_x11.XNextEvent || !peak_x11.XLookupKeysym || !peak_x11.XPutImage ||
!peak_x11.XDefaultScreen || !peak_x11.XRootWindow || !peak_x11.XBlackPixel ||
!peak_x11.XDefaultVisual || !peak_x11.XDefaultDepth) {
return 0;
}
return 1;
}
typedef struct {
Display *display;
Atom wm_delete_window;
bool initialized;
} PeakLinux;
typedef struct {
Window window;
GC gfx_ctx; /* GRAPHICS CONTEXT, not garbage collector lol */
} PeakLinuxWindow;
static PeakLinux peak_linux = {0};
static PeakLinuxWindow peak_linux_window = {0};
static XImage *peak_linux_ximage = NULL;
static uint32_t *peak_linux_buffer = NULL;
static size_t peak_linux_width = PEAK_LINUX_DEFAULT_WIDTH;
static size_t peak_linux_height = PEAK_LINUX_DEFAULT_HEIGHT;
static PeakKeyCode
peak__x11_map_key(KeySym sym)
{
if (sym >= XK_a && sym <= XK_z) return (PeakKeyCode)(PEAK_KEY_A + (int)(sym - XK_a));
if (sym >= XK_A && sym <= XK_Z) return (PeakKeyCode)(PEAK_KEY_A + (int)(sym - XK_A));
switch (sym) {
case XK_Up: return PEAK_KEY_UP;
case XK_Down: return PEAK_KEY_DOWN;
case XK_Left: return PEAK_KEY_LEFT;
case XK_Right: return PEAK_KEY_RIGHT;
case XK_space: return PEAK_KEY_SPACE;
case XK_Escape: return PEAK_KEY_ESCAPE;
case XK_Return: return PEAK_KEY_ENTER;
default: return PEAK_KEY_UNKNOWN;
}
}
static PeakKeyMod
peak__x11_map_mod(unsigned int state)
{
if (state & ControlMask) return PEAK_KEYMOD_CTRL;
if (state & Mod1Mask) return PEAK_KEYMOD_ALT;
if (state & ShiftMask) return PEAK_KEYMOD_SHIFT;
if (state & LockMask) return PEAK_KEYMOD_CAPS;
return (PeakKeyMod)0;
}
void
peak_platform_window_open()
{
void *x11_handle = dlopen(PEAK_X11_LINUX, RTLD_LOCAL | RTLD_NOW);
assert(x11_handle && "Failed to load X11 library. What system are you fucking using and abusing?");
int success = peak_load_x11(x11_handle);
assert(success && "Failed to open X11 display");
peak_linux.display = peak_x11.XOpenDisplay(NULL);
assert(peak_linux.display && "Failed to open X11 display");
/* Who design this API??? */
int screen = DefaultScreen(peak_linux.display);
peak_linux_window.window = peak_x11.XCreateSimpleWindow(peak_linux.display, RootWindow(peak_linux.display, screen), 0, 0, peak_linux_width, peak_linux_height, 0, BlackPixel(peak_linux.display, screen), BlackPixel(peak_linux.display, screen));
peak_x11.XStoreName(peak_linux.display, peak_linux_window.window, "Peak");
peak_linux.wm_delete_window = peak_x11.XInternAtom(peak_linux.display, "WM_DELETE_WINDOW", False);
peak_x11.XSetWMProtocols(peak_linux.display, peak_linux_window.window, &peak_linux.wm_delete_window, 1);
peak_x11.XSelectInput(peak_linux.display, peak_linux_window.window, ExposureMask | KeyPressMask | KeyReleaseMask | ButtonPressMask | ButtonReleaseMask | PointerMotionMask | StructureNotifyMask);
peak_linux_window.gfx_ctx = peak_x11.XCreateGC(peak_linux.display, peak_linux_window.window, 0, NULL);
peak_linux_buffer = (uint32_t *)calloc(peak_linux_width * peak_linux_height, sizeof(uint32_t));
assert(peak_linux_buffer && "Failed to allocate framebuffer");
/* Wrap the buffer in an XImage for XPutImage blitting */
Visual *visual = DefaultVisual(peak_linux.display, screen);
int depth = DefaultDepth(peak_linux.display, screen);
peak_linux_ximage = peak_x11.XCreateImage(peak_linux.display, visual, depth, ZPixmap, 0, (char *)peak_linux_buffer, peak_linux_width, peak_linux_height, 32, 0);
assert(peak_linux_ximage && "Failed to create XImage");
peak_x11.XMapRaised(peak_linux.display, peak_linux_window.window);
peak_x11.XFlush(peak_linux.display);
peak_linux.initialized = true;
}
void
peak_platform_window_close()
{
if (!peak_linux.initialized) return;
if (peak_linux_ximage) {
peak_linux_ximage->data = NULL;
XDestroyImage(peak_linux_ximage);
peak_linux_ximage = NULL;
}
free(peak_linux_buffer);
peak_linux_buffer = NULL;
peak_x11.XFreeGC(peak_linux.display, peak_linux_window.gfx_ctx);
peak_x11.XDestroyWindow(peak_linux.display, peak_linux_window.window);
peak_x11.XCloseDisplay(peak_linux.display);
peak_linux.initialized = false;
}
uint32_t *
peak_platform_window_buffer(size_t *width, size_t *height)
{
*width = peak_linux_width;
*height = peak_linux_height;
return peak_linux_buffer;
}
bool
peak_platform_epoll(PeakEvent *ev)
{
if (!peak_linux.initialized) return false;
Display *dpy = peak_linux.display;
while (peak_x11.XPending(dpy) > 0) {
XEvent xev;
peak_x11.XNextEvent(dpy, &xev);
switch (xev.type) {
case ClientMessage:
if ((Atom)xev.xclient.data.l[0] == peak_linux.wm_delete_window) {
ev->type = PEAK_EVENT_WINDOW_CLOSE;
printf("CLLOOOOOOOSEEEE");
return true;
}
continue;
case KeyPress:
case KeyRelease: {
KeySym sym = peak_x11.XLookupKeysym(&xev.xkey, 0);
ev->type = (xev.type == KeyPress) ? PEAK_EVENT_KEY_DOWN : PEAK_EVENT_KEY_UP;
ev->key.key = peak__x11_map_key(sym);
ev->key.mod = peak__x11_map_mod(xev.xkey.state);
return true;
}
case ButtonPress:
case ButtonRelease: {
ev->type = PEAK_EVENT_POINTER;
ev->pointer.state = (xev.type == ButtonPress) ? PEAK_POINTER_PRESSED : PEAK_POINTER_RELEASED;
ev->pointer.x = (float)xev.xbutton.x;
ev->pointer.y = (float)xev.xbutton.y;
switch (xev.xbutton.button) {
case Button1: ev->pointer.type = PEAK_POINTER_LEFT; break;
case Button2: ev->pointer.type = PEAK_POINTER_MIDDLE; break;
case Button3: ev->pointer.type = PEAK_POINTER_RIGHT; break;
default: ev->pointer.type = PEAK_POINTER_LEFT; break;
}
return true;
}
case MotionNotify:
ev->type = PEAK_EVENT_POINTER;
ev->pointer.state = PEAK_POINTER_MOVED;
ev->pointer.x = (float)xev.xmotion.x;
ev->pointer.y = (float)xev.xmotion.y;
if (xev.xmotion.state & Button3Mask)
ev->pointer.type = PEAK_POINTER_RIGHT;
else if (xev.xmotion.state & Button2Mask)
ev->pointer.type = PEAK_POINTER_MIDDLE;
else
ev->pointer.type = PEAK_POINTER_LEFT;
return true;
case ConfigureNotify:
if ((size_t)xev.xconfigure.width != peak_linux_width ||
(size_t)xev.xconfigure.height != peak_linux_height) {
ev->type = PEAK_EVENT_WINDOW_RESIZE;
ev->resize.width = (uint32_t)xev.xconfigure.width;
ev->resize.height = (uint32_t)xev.xconfigure.height;
return true;
}
continue;
case Expose:
if (xev.xexpose.count == 0) {
peak_x11.XPutImage(dpy, peak_linux_window.window, peak_linux_window.gfx_ctx, peak_linux_ximage, 0, 0, 0, 0, peak_linux_width, peak_linux_height);
}
continue;
default:
continue;
}
}
peak_x11.XPutImage(dpy, peak_linux_window.window, peak_linux_window.gfx_ctx, peak_linux_ximage, 0, 0, 0, 0, peak_linux_width, peak_linux_height);
peak_x11.XFlush(dpy);
return false;
}
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