add static linking

overlay/build.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+echo Building with ...
+echo gcc src/main.c -o res/main $(pkg-config --cflags --libs sdl3 x11 xfixes sdl3-image)
+gcc src/main.c src/neko.c -I src/ -o res/main $(pkg-config --static --cflags --libs sdl3 x11 xfixes sdl3-image) -lm
+
+echo Building static version
+echo gcc src/main.c src/neko.c -I src/ -o res/main 
+echo    $(pkg-config --cflags sdl3 x11 xfixes sdl3-image) 
+echo    -Wl,-Bstatic -lSDL3 -lSDL3_image -Wl,-Bdynamic 
+echo    -lX11 -lXfixes -lm
+gcc src/main.c src/neko.c -I src/ -o res/main \
+    $(pkg-config --cflags sdl3 x11 xfixes sdl3-image) \
+    -Wl,-Bstatic -lSDL3 -lSDL3_image -Wl,-Bdynamic \
+    -lX11 -lXfixes -lm
+
+echo Running...
+#DISPLAY=:1 ./res/main
+./res/main

overlay/src/common.h

@@ -0,0 +1,7 @@
+#ifndef COMMON_H
+#define COMMON_H
+
+extern int WINDOW_WIDTH;
+extern int WINDOW_HEIGHT;
+
+#endif

overlay/src/main.c

@@ -0,0 +1,192 @@
+/* textures.c ... */
+
+/*
+ * This example creates an SDL window and renderer, and then draws some
+ * textures to it every frame.
+ *
+ * This code is public domain. Feel free to use it for any purpose!
+ */
+
+#define SDL_MAIN_USE_CALLBACKS 1  /* use the callbacks instead of main() */
+
+#include <X11/Xlib.h>
+#include <X11/extensions/shape.h>
+#include <X11/extensions/Xfixes.h>
+#include <X11/Xutil.h>
+
+#include <SDL3/SDL.h>
+#include <SDL3/SDL_main.h>
+#include <SDL3_image/SDL_image.h>
+
+#include <stdio.h>
+
+#include "neko.h"
+#include "common.h"
+
+/* We will use this renderer to draw into this window every frame. */
+static SDL_Window *window = NULL;
+static SDL_Renderer *renderer = NULL;
+static IMG_Animation *anim;
+static SDL_Texture **anim_textures;
+static int current_frame = 1;
+
+int WINDOW_WIDTH;
+int WINDOW_HEIGHT;
+
+void set_override_redirect() {
+    Display *dpy = (Display *)SDL_GetPointerProperty(SDL_GetWindowProperties(window), SDL_PROP_WINDOW_X11_DISPLAY_POINTER, NULL);
+    Window xwin = (Window)SDL_GetNumberProperty(SDL_GetWindowProperties(window), SDL_PROP_WINDOW_X11_WINDOW_NUMBER, 0);
+
+    XSetWindowAttributes attrs;
+    attrs.override_redirect = True;
+
+    XChangeWindowAttributes(dpy, xwin, CWOverrideRedirect, &attrs);
+    XFlush(dpy);
+}
+
+void make_window_clickthrough() {
+    Display *dpy = (Display *)SDL_GetPointerProperty(SDL_GetWindowProperties(window), SDL_PROP_WINDOW_X11_DISPLAY_POINTER, NULL);
+    Window xwin = (Window)SDL_GetNumberProperty(SDL_GetWindowProperties(window), SDL_PROP_WINDOW_X11_WINDOW_NUMBER, 0);
+
+    // Make input shape empty → ignores mouse events
+    XRectangle rect;
+    XserverRegion region = XFixesCreateRegion(dpy, &rect, 0);
+    XFixesSetWindowShapeRegion(dpy, xwin, ShapeInput, 0, 0, region);
+    XFixesDestroyRegion(dpy, region);
+
+    XFlush(dpy);
+}
+
+Uint32 increment_frame(void *userdata, SDL_TimerID timerID, Uint32 interval){
+    current_frame = (current_frame+1) % anim->count;
+    return(interval);
+}
+
+/* This function runs once at startup. */
+SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
+{
+    char *gif_path = NULL;
+
+    SDL_SetAppMetadata("systemd", "1.0", "org.kernel.systemd");
+
+    if (!SDL_Init(SDL_INIT_VIDEO)) {
+        SDL_Log("Couldn't initialize SDL: %s", SDL_GetError());
+        return SDL_APP_FAILURE;
+    }
+
+    // Init window size to fullscreen
+    int num_displays;
+    SDL_DisplayID *displays = SDL_GetDisplays(&num_displays);
+    SDL_Log("Found %d display(s)", num_displays);
+
+    const SDL_DisplayMode* DisplayMode =  SDL_GetCurrentDisplayMode(displays[0]);
+    SDL_free(displays);
+    if(DisplayMode==NULL){
+        printf("Error could not get display mode");
+        return 1;
+    }
+    WINDOW_WIDTH = DisplayMode->w;
+    WINDOW_HEIGHT = DisplayMode->h;
+
+    if (!SDL_CreateWindowAndRenderer("systemd", WINDOW_WIDTH, WINDOW_HEIGHT,
+        SDL_WINDOW_TRANSPARENT | SDL_WINDOW_ALWAYS_ON_TOP | SDL_WINDOW_BORDERLESS ,
+        &window, &renderer)) {
+        SDL_Log("Couldn't create window/renderer: %s", SDL_GetError());
+        return SDL_APP_FAILURE;
+    }
+
+    make_window_clickthrough();
+    set_override_redirect();
+    SDL_SetDefaultTextureScaleMode(renderer, SDL_SCALEMODE_PIXELART);
+
+    neko_init(renderer, window);
+
+    /* Open the image file */
+    SDL_asprintf(&gif_path, "%ssample.gif", SDL_GetBasePath());
+    anim = IMG_LoadAnimation(gif_path);
+    if (!anim) {
+        SDL_Log("Couldn't load %s: %s\n", gif_path, SDL_GetError());
+        return SDL_APP_FAILURE;
+    }
+    SDL_free(gif_path);  /* done with this, the file is loaded. */
+    int aw = anim->w;
+    int ah = anim->h;
+
+    anim_textures = (SDL_Texture **)SDL_calloc(anim->count, sizeof(*anim_textures));
+    if (!anim_textures) {
+        SDL_Log("Couldn't allocate textures\n");
+        IMG_FreeAnimation(anim);
+        return SDL_APP_FAILURE;
+    }
+    for (int i = 0; i < anim->count; ++i) {
+        anim_textures[i] = SDL_CreateTextureFromSurface(renderer, anim->frames[i]);
+    }
+    SDL_AddTimer(anim->delays[0], increment_frame, NULL);
+
+    return SDL_APP_CONTINUE;  /* carry on with the program! */
+}
+
+/* This function runs when a new event (mouse input, keypresses, etc) occurs. */
+SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event)
+{
+    if (event->type == SDL_EVENT_QUIT) {
+        return SDL_APP_SUCCESS;  /* end the program, reporting success to the OS. */
+    }
+    return SDL_APP_CONTINUE;  /* carry on with the program! */
+}
+
+/* This function runs once per frame, and is the heart of the program. */
+SDL_AppResult SDL_AppIterate(void *appstate)
+{
+    SDL_FRect dst_rect;
+    const Uint64 now = SDL_GetTicks();
+
+    /* as you can see from this, rendering draws over whatever was drawn before it. */
+    SDL_SetRenderDrawColor(renderer, 0, 0, 0, SDL_ALPHA_TRANSPARENT);  /* black, full alpha */
+    SDL_RenderClear(renderer);  /* start with a blank canvas. */
+
+    neko_render(renderer, window);
+    /*
+    dst_rect.x = WINDOW_HEIGHT/2;
+    dst_rect.y = WINDOW_HEIGHT/2;
+    dst_rect.h = WINDOW_HEIGHT/10;
+    dst_rect.w = WINDOW_HEIGHT/10;
+    SDL_RenderTexture(renderer, anim_textures[current_frame], NULL, &dst_rect);
+    */
+
+    SDL_RenderPresent(renderer);  /* put it all on the screen! */
+
+    return SDL_APP_CONTINUE;  /* carry on with the program! */
+}
+
+/* This function runs once at shutdown. */
+void SDL_AppQuit(void *appstate, SDL_AppResult result)
+{
+    neko_quit();
+    /* SDL will clean up the window/renderer for us. */
+}
+
+/* BACKUP SDL_AppIterate
+
+    const float direction = ((now % 2000) >= 1000) ? 1.0f : -1.0f;
+    const float scale = ((float) (((int) (now % 1000)) - 500) / 500.0f) * direction;
+
+    dst_rect.x = (100.0f * scale);
+    dst_rect.y = 0.0f;
+    dst_rect.w = (float) texture_width;
+    dst_rect.h = (float) texture_height;
+    SDL_RenderTexture(renderer, texture, NULL, &dst_rect);
+
+
+    dst_rect.x = ((float) (WINDOW_WIDTH - texture_width)) / 2.0f;
+    dst_rect.y = ((float) (WINDOW_HEIGHT - texture_height)) / 2.0f;
+    dst_rect.w = (float) texture_width/2;
+    dst_rect.h = (float) texture_height/2;
+    SDL_RenderTexture(renderer, texture, NULL, &dst_rect);
+
+
+    dst_rect.x = ((float) (WINDOW_WIDTH - texture_width)) - (100.0f * scale);
+    dst_rect.y = (float) (WINDOW_HEIGHT - texture_height);
+    dst_rect.w = (float) texture_width;
+    dst_rect.h = (float) texture_height;
+*/

overlay/src/neko.c

@@ -0,0 +1,194 @@
+#include "neko.h"
+#include "common.h"
+#include <math.h>
+
+static int texture_width = 0;
+static int texture_height = 0;
+
+static float catx = 200;
+static float caty = 200;
+static float speed = 5.0;
+
+#define TIME_BEFORE_SPLEEP 3000
+#define TIME_BEFORE_RUNNING 1000
+#define TIME_ANIM_INTERVAL 300
+
+enum CatState {
+    ST_SLEEPING,
+    ST_RUNNING,
+    ST_WAKING_UP,
+    ST_STAND_BY,
+} cat_state = ST_RUNNING;
+
+enum CatFrames {
+    STAND_BY=0,
+    WAKING_UP=1,
+    UP=2,
+    DOWN=4,
+    LEFT=6,
+    RIGHT=8,
+    UP_LEFT=10,
+    UP_RIGHT=12,
+    DOWN_RIGHT=14,
+    DOWN_LEFT=16,
+    SLEEPING=18,
+};
+
+static int state_timer;
+static int anim_timer = 0;
+static int current_frame = 0; 
+
+static float diffx, diffy;
+
+static IMG_Animation *anim;
+static SDL_Texture **anim_textures;
+
+int neko_init(SDL_Renderer *renderer, SDL_Window *window){
+    char *neko_gif_path = NULL;
+    
+    /* Textures are pixel data that we upload to the video hardware for fast drawing. Lots of 2D
+       engines refer to these as "sprites." We'll do a static texture (upload once, draw many
+       times) with data from a bitmap file. */
+
+    /* SDL_Surface is pixel data the CPU can access. SDL_Texture is pixel data the GPU can access.
+       Load a .bmp into a surface, move it to a texture from there. */
+    SDL_asprintf(&neko_gif_path, "%sreal_oneko.gif", SDL_GetBasePath());
+    anim = IMG_LoadAnimation(neko_gif_path);
+    if (!anim) {
+        SDL_Log("Couldn't load %s: %s\n", neko_gif_path, SDL_GetError());
+        return SDL_APP_FAILURE;
+    }
+    SDL_free(neko_gif_path);  /* done with this, the file is loaded. */
+
+    texture_width = anim->w;
+    texture_height = anim->h;
+
+    anim_textures = (SDL_Texture **)SDL_calloc(anim->count, sizeof(*anim_textures));
+    if (!anim_textures) {
+        SDL_Log("Couldn't allocate textures\n");
+        IMG_FreeAnimation(anim);
+        return SDL_APP_FAILURE;
+    }
+    for (int i = 0; i < anim->count; ++i) {
+        anim_textures[i] = SDL_CreateTextureFromSurface(renderer, anim->frames[i]);
+    }
+
+    SDL_AddTimer(50, move_cat, window);
+}
+
+void neko_render(SDL_Renderer *renderer, SDL_Window *window){
+    SDL_FRect dst_rect;
+
+    dst_rect.x = catx;
+    dst_rect.y = caty;
+    dst_rect.h = WINDOW_HEIGHT/20;
+    dst_rect.w = WINDOW_HEIGHT/20;
+
+    int texture_index = 0;
+    switch (cat_state)
+    {
+    case ST_SLEEPING:
+        texture_index = SLEEPING+current_frame;
+        break;
+    case ST_WAKING_UP:
+        texture_index = WAKING_UP;
+        break;
+    case ST_STAND_BY:
+        texture_index = STAND_BY;
+        break;
+    case ST_RUNNING:
+        // We do this to know if our cat is moving in diagonals
+        double angle = fabs(atan((double) (diffy/diffx)));
+        if(angle<SDL_PI_D/3 && angle>SDL_PI_D/6){ // Diagonals
+            if(diffy<0){
+                if(diffx<0){
+                    texture_index = DOWN_RIGHT+current_frame;
+                }else{
+                    texture_index = DOWN_LEFT+current_frame;
+                }
+            }else{
+                if(diffx<0){
+                    texture_index = UP_RIGHT+current_frame;
+                }else{
+                    texture_index = UP_LEFT+current_frame;
+                }
+            }
+        }else{ // pas diagonals
+            if(fabs(diffy) > fabs(diffx)){
+                if(diffy<0){
+                    texture_index = DOWN+current_frame;
+                }else{
+                    texture_index = UP+current_frame;
+                }
+            }else{
+                if(diffx<0){
+                    texture_index = RIGHT+current_frame;
+                }else{
+                    texture_index = LEFT+current_frame;
+                }
+            }
+        }
+        break;
+    
+    default:
+        break;
+    }
+
+    SDL_RenderTexture(renderer, anim_textures[texture_index], NULL, &dst_rect);
+
+    if(SDL_GetTicks()-anim_timer > TIME_ANIM_INTERVAL){
+        current_frame = (current_frame+1) % 2;
+        anim_timer=SDL_GetTicks();
+    }
+}
+
+void neko_quit(){
+    SDL_DestroyTexture(anim_textures[current_frame]);
+}
+
+Uint32 move_cat(void *window, SDL_TimerID timerID, Uint32 interval){
+    float mousex, mousey;
+    float hypo;
+    int windowx, windowy;
+
+    SDL_GetGlobalMouseState(&mousex, &mousey);
+    SDL_GetWindowPosition(window, &windowx, &windowy);
+
+    diffx = catx-(mousex-(float)windowx);
+    diffy = caty-(mousey-(float)windowy);
+    hypo = sqrt(diffx*diffx + diffy*diffy); 
+    switch (cat_state)
+    {
+    case ST_RUNNING:
+        if (hypo>50){
+            catx -= (diffx*speed/hypo);
+            caty -= (diffy*speed/hypo);
+        }else{
+            cat_state = ST_STAND_BY;
+            state_timer = SDL_GetTicks();
+        }
+        break;
+    case ST_STAND_BY:
+        if (hypo>50){
+            cat_state = ST_RUNNING;
+        }else if (SDL_GetTicks()-TIME_BEFORE_SPLEEP > state_timer){
+            cat_state = ST_SLEEPING;
+        }
+        break;
+    case ST_SLEEPING:
+        if (hypo>50){
+            cat_state = ST_WAKING_UP;
+            state_timer = SDL_GetTicks();
+        }
+        break;
+    case ST_WAKING_UP:
+        if (SDL_GetTicks()-TIME_BEFORE_RUNNING > state_timer){
+            cat_state = ST_RUNNING;
+        }
+        break;
+    
+    default:
+        break;
+    }
+    return(interval);
+}

overlay/src/neko.h

@@ -0,0 +1,15 @@
+#ifndef NEKO_H
+#define NEKO_H
+
+#include <SDL3/SDL.h>
+#include <SDL3/SDL_main.h>
+#include <SDL3_image/SDL_image.h>
+
+#include <stdio.h>
+
+int neko_init(SDL_Renderer *renderer, SDL_Window *window);
+void neko_render(SDL_Renderer *renderer, SDL_Window *window);
+void neko_quit();
+Uint32 move_cat(void *window, SDL_TimerID timerID, Uint32 interval);
+
+#endif