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

MG/MG_GL/State/VertexArray/VertexArrayState.h

@@ -0,0 +1,53 @@
+//
+// Created by BZLZHH on 2025/5/1.
+//
+
+#ifndef MOBILEGL_VERTEXARRAYSTATE_H
+#define MOBILEGL_VERTEXARRAYSTATE_H
+#define MOBILEGL_GLSTATE_H
+
+#include "../../../Includes.h"
+
+struct VertexAttribState {
+    bool enabled = false;
+    GLint size = 4;
+    GLenum type = GL_FLOAT;
+    GLboolean normalized = GL_FALSE;
+    GLsizei stride = 0;
+    const GLvoid* pointer = nullptr;
+    GLuint buffer = 0;
+    bool isInteger = false;
+};
+
+struct VertexArrayObject {
+    bool generated = false;
+    GLuint elementBuffer = 0;
+    std::unordered_map<GLuint, VertexAttribState> attribs;
+};
+
+class VertexArrayState {
+public:
+    VertexArrayState();
+    
+    // Return: the validity of the operation, according to OpenGL 3 standard
+    GLenum Create(GLuint* array);
+    GLenum CreateN(GLsizei n, GLuint* arrays);
+    GLenum Bind(GLuint array);
+    GLenum EnableAttrib(GLuint index);
+    GLenum DisableAttrib(GLuint index);
+    GLenum SetAttribPointer(GLuint index, GLint size, GLenum type,
+                            GLboolean normalized, GLsizei stride,
+                            const void* pointer, bool isInteger,
+                            GLuint currentArrayBuffer);
+    
+    GLuint GetBoundElementBuffer();
+    VertexArrayObject* GetCurrentVAO();
+
+private:
+    std::unordered_map<GLuint, VertexArrayObject> vaos_;
+    std::set<GLuint> freeIds_;
+    GLuint lastId_ = 0;
+    GLuint currentVao_ = 0;
+};
+
+#endif //MOBILEGL_VERTEXARRAYSTATE_H