feat: rewrite to cpp + refactor into files

include/shader.h

@@ -0,0 +1,10 @@
+#ifndef H_SHADER_
+#define H_SHADER_
+
+#include <GLES2/gl2.h>
+
+GLuint compile_shader(GLenum type, const char *src);
+
+GLuint create_program(const char *vs_src, const char *fs_src);
+
+#endif // H_SHADER_

include/state.h

@@ -0,0 +1,27 @@
+#ifndef H_STATE
+#define H_STATE
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+#include <GLES2/gl2.h>
+
+typedef struct {
+  struct wl_display *display;
+	EGLDisplay egl_display;
+	struct wl_egl_window *egl_window;
+	EGLSurface egl_surface;
+	bool ready;
+
+  struct wl_compositor *compositor;
+  struct xdg_wm_base *wm_base;
+  struct wl_surface *w_surface;
+  struct xdg_surface *x_surface;
+  struct xdg_toplevel *toplevel;
+
+  struct wl_shm *shm;
+
+	struct wl_callback *frame_callback;
+	GLuint program;
+} State;
+
+#endif // H_STATE