LibGL: Implement glVertexPointer

Author: https://github.com/sunverwerth
Commit: 07b9cba6e6
Pull-request: https://github.com/SerenityOS/serenity/pull/9382
Reviewed-by: https://github.com/alimpfard

Userland/Libraries/LibGL/SoftwareGLContext.h

@@ -76,6 +76,7 @@ public:
     virtual void gl_depth_mask(GLboolean flag) override;
     virtual void gl_enable_client_state(GLenum cap) override;
     virtual void gl_disable_client_state(GLenum cap) override;
+    virtual void gl_vertex_pointer(GLint size, GLenum type, GLsizei stride, const void* pointer) override;
 
     virtual void present() override;
 
@@ -223,6 +224,15 @@ private:
         GLenum mode { GL_COMPILE };
     };
     Optional<CurrentListing> m_current_listing_index;
+
+    struct VertexAttribPointer {
+        GLint size { 4 };
+        GLenum type { GL_FLOAT };
+        GLsizei stride { 0 };
+        const void* pointer { 0 };
+    };
+
+    VertexAttribPointer m_client_vertex_pointer;
 };
 
 }