add grids panel

engine/shape.h

@@ -24,13 +24,19 @@ public:
     bool create_buffers(GLvoid* vertices, int vsize);
     void draw_fill() const;
     void draw_stroke() const;
-    virtual bool create_attrib() { return true; };
-    ~Shape()
+    void destroy()
     {
         glDeleteBuffers(2, buffers);
 #if USE_VBO
         glDeleteVertexArrays(2, arrays);
 #endif // USE_VBO
+        buffers[0] = buffers[1] = 0;
+        arrays[0] = arrays[1] = 0;
+    }
+    virtual bool create_attrib() { return true; };
+    ~Shape()
+    {
+        destroy();
     }
 protected:
     glm::vec2 quad_mid_point(glm::vec2 a, glm::vec2 b, glm::vec2 c, glm::vec2 d)
@@ -95,11 +101,20 @@ public:
     template<int div>
     bool create(float w, float h)
     {
-        static GLushort idx[div * div * 6 + 8];
+        static GLushort idx[div * div * 6 + (div + 1) * 4];
         static vertex_t vertices[(div+1)*(div+1)];
         create_impl(w, h, div, idx, vertices);
         return create_buffers(idx, vertices, sizeof(idx), sizeof(vertices));
     }
+    bool create(float w, float h, int div)
+    {
+        int idx_size = div * div * 6 + (div + 1) * 4;
+        int vertices_size = (div + 1)*(div + 1);
+        auto idx = std::make_unique<GLushort[]>(idx_size);
+        auto vertices = std::make_unique<vertex_t[]>(vertices_size);
+        create_impl(w, h, div, idx.get(), vertices.get());
+        return create_buffers(idx.get(), vertices.get(), sizeof(GLushort) * idx_size, sizeof(vertex_t) * vertices_size);
+    }
     void update_vertices(const glm::vec4* data, const glm::vec2* uvs = nullptr, const glm::vec2* uvs2 = nullptr);
 /*
     bool create(att::Divisions divisions, att::Width w, att::Height h)