pch migration to modules [wip]

gl/pbo.cppm

@@ -0,0 +1,29 @@
+module;
+#include "glad/glad.h"
+#include <optional>
+
+export module eu07.gl.pbo;
+import eu07.gl.buffer;
+import eu07.gl.fence;
+
+export {
+
+
+namespace gl {
+    class pbo : public buffer
+    {
+        std::optional<fence> sync;
+        int size = 0;
+        bool data_ready;
+
+    public:
+        void request_read(int x, int y, int lx, int ly, int pixsize = 4, GLenum format = GL_RGBA, GLenum type = GL_UNSIGNED_BYTE);
+        bool read_data(int lx, int ly, void *data, int pixsize = 4);
+        bool is_busy();
+
+		void* map(GLuint mode, targets target = PIXEL_UNPACK_BUFFER);
+		void unmap(targets target = PIXEL_UNPACK_BUFFER);
+    };
+}
+
+}  // export