diff --git a/c/raylib/_demo/raylibdemo/raydemo.go b/c/raylib/_demo/raylibdemo/raydemo.go
new file mode 100644
index 00000000..62baabc1
--- /dev/null
+++ b/c/raylib/_demo/raylibdemo/raydemo.go
@@ -0,0 +1,18 @@
+package main
+
+import (
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/c/raylib"
+)
+
+func main() {
+	const screenWidth = 800
+	const screenHeight = 450
+	raylib.InitWindow(screenWidth, screenHeight, c.Str("Raylib DEMO"))
+	for !raylib.WindowShouldClose() {
+		raylib.BeginDrawing()
+		raylib.ClearBackground(raylib.RAYWHITE)
+		raylib.DrawRectangle(screenWidth/2-50, screenHeight/2-50, 100, 100, raylib.BLUE)
+		raylib.EndDrawing()
+	}
+}
diff --git a/c/raylib/llgo_autogen.lla b/c/raylib/llgo_autogen.lla
new file mode 100644
index 00000000..63425947
Binary files /dev/null and b/c/raylib/llgo_autogen.lla differ
diff --git a/c/raylib/raylib.go b/c/raylib/raylib.go
index 8e2bbba9..d5dba1ca 100644
--- a/c/raylib/raylib.go
+++ b/c/raylib/raylib.go
@@ -53,9 +53,39 @@ type Vector4 struct {
 type Quaternion = Vector4
 
 // Color, 4 components, R8G8B8A8 (32bit)
-type Color struct {
-	R, G, B, A uint8
-}
+// R, G, B, A uint8
+type Color uint32
+
+const (
+	LIGHTGRAY = Color(200 | 200<<8 | 200<<16 | 255<<24) // Light Gray
+	GRAY      = Color(130 | 130<<8 | 130<<16 | 255<<24) // Gray
+	DARKGRAY  = Color(80 | 80<<8 | 80<<16 | 255<<24)    // Dark Gray
+	YELLOW    = Color(253 | 249<<8 | 0<<16 | 255<<24)   // Yellow
+	GOLD      = Color(255 | 203<<8 | 0<<16 | 255<<24)   // Gold
+	ORANGE    = Color(255 | 161<<8 | 0<<16 | 255<<24)   // Orange
+	PINK      = Color(255 | 109<<8 | 194<<16 | 255<<24) // Pink
+	RED       = Color(230 | 41<<8 | 55<<16 | 255<<24)   // Red
+	MAROON    = Color(190 | 33<<8 | 55<<16 | 255<<24)   // Maroon
+	GREEN     = Color(0 | 228<<8 | 48<<16 | 255<<24)    // Green
+	LIME      = Color(0 | 158<<8 | 47<<16 | 255<<24)    // Lime
+	DARKGREEN = Color(0 | 117<<8 | 44<<16 | 255<<24)    // Dark Green
+	SKYBLUE   = Color(102 | 191<<8 | 255<<16 | 255<<24) // Sky Blue
+	BLUE      = Color(0 | 121<<8 | 241<<16 | 255<<24)   // Blue
+
+	DARKBLUE   = Color(0 | 82<<8 | 172<<16 | 255<<24)    // Dark Blue
+	PURPLE     = Color(200 | 122<<8 | 255<<16 | 255<<24) // Purple
+	VIOLET     = Color(135 | 60<<8 | 190<<16 | 255<<24)  // Violet
+	DARKPURPLE = Color(112 | 31<<8 | 126<<16 | 255<<24)  // Dark Purple
+	BEIGE      = Color(211 | 176<<8 | 131<<16 | 255<<24) // Beige
+	BROWN      = Color(127 | 106<<8 | 79<<16 | 255<<24)  // Brown
+	DARKBROWN  = Color(76 | 63<<8 | 47<<16 | 255<<24)    // Dark Brown
+
+	WHITE    = Color(255 | 255<<8 | 255<<16 | 255<<24) // White
+	BLACK    = Color(0 | 0<<8 | 0<<16 | 255<<24)       // Black
+	BLANK    = Color(0 | 0<<8 | 0<<16 | 0<<24)         // Blank (Transparent)
+	MAGENTA  = Color(255 | 0<<8 | 255<<16 | 255<<24)   // Magenta
+	RAYWHITE = Color(245 | 245<<8 | 245<<16 | 255<<24) // My own White (raylib logo)
+)
 
 // Image, pixel data stored in CPU memory (RAM)
 type Image struct {
@@ -297,3 +327,10 @@ func BeginScissorMode(x, y, width, height c.Int)
 func EndScissorMode()
 
 // -----------------------------------------------------------------------------
+
+// Draw a color-filled rectangle
+//
+//go:linkname DrawRectangle C.DrawRectangle
+func DrawRectangle(posX, posY, width, height c.Int, color Color)
+
+// -----------------------------------------------------------------------------
diff --git a/chore/_xtool/astdump/astdump.cpp b/chore/_xtool/astdump/astdump.cpp
new file mode 100644
index 00000000..e466fce8
--- /dev/null
+++ b/chore/_xtool/astdump/astdump.cpp
@@ -0,0 +1,63 @@
+#include <clang-c/Index.h>
+#include <iostream>
+#include <string>
+
+CXChildVisitResult visit(CXCursor c, CXCursor parent, CXClientData client_data);
+
+void printAST(CXCursor cursor, unsigned int depth = 0) {
+    CXString cursorKind = clang_getCursorKindSpelling(clang_getCursorKind(cursor));
+    CXString cursorSpelling = clang_getCursorSpelling(cursor);
+
+    for (unsigned int i = 0; i < depth; ++i) {
+        std::cout << "  ";
+    }
+
+    std::cout << clang_getCString(cursorKind) << ": " 
+              << clang_getCString(cursorSpelling) << std::endl;
+
+    clang_disposeString(cursorKind);
+    clang_disposeString(cursorSpelling);
+
+    CXCursor child;
+    clang_visitChildren(
+        cursor,
+        visit,
+        &depth
+    );
+}
+
+CXChildVisitResult visit(CXCursor c, CXCursor parent, CXClientData client_data) {
+    unsigned int* depth = (unsigned int*)client_data;
+    printAST(c, *depth + 1);
+    return CXChildVisit_Continue;
+}
+
+int main(int argc, char* argv[]) {
+    if (argc < 2) {
+        std::cerr << "Usage: " << argv[0] << " <header_file>" << std::endl;
+        return 1;
+    }
+
+    CXIndex index = clang_createIndex(0, 0);
+    CXTranslationUnit unit = clang_parseTranslationUnit(
+        index,
+        argv[1],
+        nullptr, 0,
+        nullptr, 0,
+        CXTranslationUnit_None
+    );
+
+    if (unit == nullptr) {
+        std::cerr << "Unable to parse translation unit. Quitting." << std::endl;
+        return 1;
+    }
+
+    CXCursor cursor = clang_getTranslationUnitCursor(unit);
+    std::cout << "AST for " << argv[1] << ":" << std::endl;
+    printAST(cursor);
+
+    clang_disposeTranslationUnit(unit);
+    clang_disposeIndex(index);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/chore/_xtool/astdump/build.sh b/chore/_xtool/astdump/build.sh
new file mode 100755
index 00000000..d255f327
--- /dev/null
+++ b/chore/_xtool/astdump/build.sh
@@ -0,0 +1,2 @@
+export LLVM_DIR=/opt/homebrew/Cellar/llvm@17/17.0.6
+clang -L$LLVM_DIR/lib -lclang -lc++ -I$LLVM_DIR/include astdump.cpp