wip: extend shared library support, window demo

programs/libs/libhello/src/libhello.cpp

@@ -0,0 +1,67 @@
+/*
+    * libhello.cpp
+    * Sample shared GUI library for MontaukOS
+    * Creates a window and renders text as a demo of the shared library + GUI system
+    * Copyright (c) 2026 Daniel Hammer
+*/
+
+#include <montauk/syscall.h>
+
+// Exported demo function - creates a window and renders until closed
+extern "C" int hello_run() {
+    // Create window
+    Montauk::WinCreateResult wres;
+    if (montauk::win_create("libhello Demo", 320, 200, &wres) < 0 || wres.id < 0) {
+        return -1;
+    }
+
+    int winId = wres.id;
+    uint32_t* pixels = (uint32_t*)(uintptr_t)wres.pixelVa;
+    int width = 200;
+    int height = 320;
+
+    // Simple render - fill with a color pattern
+    for (int y = 0; y < height; y++) {
+        for (int x = 0; x < width; x++) {
+            // Dark blue background
+            pixels[y * width + x] = 0xFF1a1a2e;
+        }
+    }
+
+    // Present the initial frame
+    montauk::win_present(winId);
+
+    // Event loop
+    while (true) {
+        Montauk::WinEvent ev;
+        int r = montauk::win_poll(winId, &ev);
+
+        if (r < 0) {
+            break;
+        }
+        if (r == 0) {
+            montauk::sleep_ms(16);
+            continue;
+        }
+
+        if (ev.type == 3) {  // close
+            break;
+        }
+        if (ev.type == 2) {  // resize
+            width = ev.resize.w;
+            height = ev.resize.h;
+            pixels = (uint32_t*)(uintptr_t)montauk::win_resize(winId, width, height);
+
+            // Re-render on resize
+            for (int y = 0; y < height; y++) {
+                for (int x = 0; x < width; x++) {
+                    pixels[y * width + x] = 0xFF1a1a2e;
+                }
+            }
+            montauk::win_present(winId);
+        }
+    }
+
+    montauk::win_destroy(winId);
+    return 0;
+}

programs/libs/libhello/src/stb_truetype_impl.cpp

@@ -0,0 +1,33 @@
+/*
+ * stb_truetype_impl.cpp
+ * Single compilation unit for stb_truetype in libhello
+ * Copyright (c) 2026 Daniel Hammer
+ */
+
+#include <cstdint>
+#include <cstddef>
+#include <montauk/heap.h>
+#include <montauk/string.h>
+#include <gui/stb_math.h>
+
+#define STBTT_ifloor(x)   ((int) stb_floor(x))
+#define STBTT_iceil(x)    ((int) stb_ceil(x))
+#define STBTT_sqrt(x)     stb_sqrt(x)
+#define STBTT_pow(x,y)    stb_pow(x,y)
+#define STBTT_fmod(x,y)   stb_fmod(x,y)
+#define STBTT_cos(x)      stb_cos(x)
+#define STBTT_acos(x)     stb_acos(x)
+#define STBTT_fabs(x)     stb_fabs(x)
+
+#define STBTT_malloc(x,u)  ((void)(u), montauk::malloc(x))
+#define STBTT_free(x,u)    ((void)(u), montauk::mfree(x))
+
+#define STBTT_memcpy(d,s,n) montauk::memcpy(d,s,n)
+#define STBTT_memset(d,v,n) montauk::memset(d,v,n)
+
+#define STBTT_strlen(x)    montauk::slen(x)
+
+#define STBTT_assert(x)    ((void)(x))
+
+#define STB_TRUETYPE_IMPLEMENTATION
+#include <gui/stb_truetype.h>