From ccda453a9095f1643fabcbb4befd148fa0d0d34e Mon Sep 17 00:00:00 2001
From: kkard2 <contact@kkard2.com>
Date: Tue, 2 Sep 2025 21:20:16 +0200
Subject: crude x11 support

---
 .gitignore     |   1 +
 platform_x11.c | 114 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 run            |   2 +
 sponge.h       |   1 +
 4 files changed, 118 insertions(+)
 create mode 100644 platform_x11.c
 create mode 100755 run

diff --git a/.gitignore b/.gitignore
index d969f6b..ab3b8fd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 *.exe
 *.obj
+platform_x11
diff --git a/platform_x11.c b/platform_x11.c
new file mode 100644
index 0000000..7887d11
--- /dev/null
+++ b/platform_x11.c
@@ -0,0 +1,114 @@
+// TODO(kard): destroy this file, i don't care about platform layer rn this is some gpt trash
+// it flickers so bad
+
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+// TODO(kard): we should probably put more thought into this
+#include "example.c"
+
+#define DEFAULT_WIDTH 256
+#define DEFAULT_HEIGHT 256
+
+static sponge_Canvas canvas = { 0 };
+static Display *dpy;
+static XImage *ximg = 0;
+
+
+void init_canvas(uint32_t width, uint32_t height) {
+    if (ximg) {
+        XDestroyImage(ximg); // also frees data (why??)
+        // TODO(kard): you can set ximg->data to null before XDestroyImage
+        ximg = NULL;
+    }
+
+    canvas.pixels = (uint32_t*)malloc(width * height * 4);
+    if (!canvas.pixels) {
+        fprintf(stderr, "failed to allocate pixel buffer\n");
+        exit(1);
+    }
+    canvas.width = width;
+    canvas.height = height;
+    canvas.stride = width;
+
+    // TODO(kard): i assume this can fail
+    ximg = XCreateImage(
+        dpy,
+        DefaultVisual(dpy, 0),
+        DefaultDepth(dpy, 0),
+        ZPixmap,
+        0,
+        (char*)canvas.pixels,
+        width,
+        height,
+        32,
+        0
+    );
+}
+
+int main() {
+    dpy = XOpenDisplay(NULL);
+    if (!dpy) {
+        fprintf(stderr, "failed to open display\n");
+        return 1;
+    }
+
+    int screen = DefaultScreen(dpy);
+
+    // TODO(kard): i assume all of the following x functions can fail
+    // clanker only checked XOpenDisplay for some reason
+
+    Window win = XCreateSimpleWindow(
+        dpy,
+        RootWindow(dpy, screen),
+        10, 10, DEFAULT_WIDTH, DEFAULT_HEIGHT,
+        1,
+        BlackPixel(dpy, screen),
+        BlackPixel(dpy, screen)
+    );
+
+    XStoreName(dpy, win, "sponge");
+    XSelectInput(dpy, win, ExposureMask | KeyPressMask | StructureNotifyMask);
+
+    GC gc = DefaultGC(dpy, screen);
+
+    XMapWindow(dpy, win);
+
+    init_canvas(DEFAULT_WIDTH, DEFAULT_HEIGHT);
+
+    int running = 1;
+    while (running) {
+        while (XPending(dpy)) {
+            XEvent ev;
+            XNextEvent(dpy, &ev);
+            switch (ev.type) {
+                case Expose:
+                    //draw_frame(canvas);
+                    break;
+                case ConfigureNotify:
+                    // TODO(kard): this is some implicit signed to unsigned conversion
+                    init_canvas(ev.xconfigure.width, ev.xconfigure.height);
+                    break;
+                case KeyPress:
+                    break;
+            }
+        }
+
+        draw_frame(canvas);
+        XPutImage(dpy, win, gc, ximg, 0, 0, 0, 0, canvas.width, canvas.height);
+
+        usleep(16000);
+    }
+
+    if (ximg) {
+        ximg->data = NULL; // prevent double free
+        XDestroyImage(ximg);
+    }
+
+    XDestroyWindow(dpy, win);
+    XCloseDisplay(dpy);
+    return 0;
+}
diff --git a/run b/run
new file mode 100755
index 0000000..f34e57a
--- /dev/null
+++ b/run
@@ -0,0 +1,2 @@
+#!/bin/bash
+cc -o platform_x11 platform_x11.c -lX11 -Wall -Wextra -g && ./platform_x11
diff --git a/sponge.h b/sponge.h
index dc50693..a383b0a 100644
--- a/sponge.h
+++ b/sponge.h
@@ -1,5 +1,6 @@
 #include <stdint.h>
 
+// TODO(kard): consider storing pixels buffer size
 typedef struct {
     // TODO(kard): define byte order
     uint32_t *pixels;
-- 
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