[Feat] (...): Add BufferState and VertexBufferState while implementing these gl functions.

MG/MG_GL/State/Buffer/BufferState.h

@@ -0,0 +1,44 @@
+//
+// Created by BZLZHH on 2025/5/1.
+//
+
+#ifndef MOBILEGL_BUFFERSTATE_H
+#define MOBILEGL_BUFFERSTATE_H
+#define MOBILEGL_GLSTATE_H
+
+#include "../../../Includes.h"
+
+class BufferState {
+public:
+    struct BufferObject {
+        GLenum target = 0;
+        GLenum usage = GL_STATIC_DRAW;
+        std::vector<GLubyte> data;
+        bool isMapped = false;
+        bool generated = false;
+        GLenum accessMode = GL_READ_WRITE;
+    };
+
+    // Return: the validity of the operation, according to OpenGL 3 standard
+    GLenum Create(GLuint* buffer);
+    GLenum CreateN(GLsizei n, GLuint* buffers);
+    GLenum Bind(GLenum target, GLuint buffer);
+    GLenum CommitStorage(GLenum target, GLsizeiptr size, const void* data, GLenum usage);
+    GLenum AcquireBufferMemory(GLenum target, GLenum access, void** mappedPointer);
+    GLenum ReleaseBufferMemory(GLenum target);
+    GLenum QueryPropertyIntVector(GLenum target, GLenum pname, GLint* params) const;
+    
+    bool ValidateHandle(GLuint buffer);
+    void Delete(GLuint buffer);
+    GLuint GetCurrentBinding(GLenum target) const;
+
+private:
+    std::unordered_map<GLuint, BufferObject> buffers_;
+    std::set<GLuint> freeIds_;
+    GLuint lastId_ = 0;
+    std::unordered_map<GLenum, GLuint> currentBindings_;
+
+    static bool IsValidTarget_(GLenum target);
+};
+
+#endif //MOBILEGL_BUFFERSTATE_H