增加硬件最大顶点属性取值和处理

inc/hgl/graph/VertexArray.h

@@ -15,7 +15,7 @@ namespace hgl
         {
         protected:
 
-            int vao;
+            GLuint vao;
 
             uint primitive;                                                                                             ///<绘制的图元类型
 
@@ -40,6 +40,8 @@ namespace hgl
             VertexArray(uint prim,uint max_vertex_attrib);
             ~VertexArray();
 
+            static int          GetMaxVertexAttrib();
+
             uint                GetPrimitive        ()const{return primitive;}                                          ///<取得要绘制的图元类型
 
         public: //通用顶点缓冲区设置
@@ -61,6 +63,7 @@ namespace hgl
         public:
 
             int                 GetDrawCount    ();                                                                     ///<取得可绘制的数据总数量
+            bool                Draw();                                                                                 ///<绘制
         };//class VertexArray
     }//namespace graph
 }//namespace hgl

src/RenderDriver/VertexArray.cpp

@@ -5,8 +5,24 @@ namespace hgl
 {
     namespace graph
     {
+        namespace
+        {
+            static int HGL_MAX_VERTEX_ATTRIBS=0;
+        }
+
+        int VertexArray::GetMaxVertexAttrib()
+        {
+            if(HGL_MAX_VERTEX_ATTRIBS<=0)
+                glGetIntegerv(GL_MAX_VERTEX_ATTRIBS,&HGL_MAX_VERTEX_ATTRIBS);
+
+            return HGL_MAX_VERTEX_ATTRIBS;
+        }
+
         VertexArray::VertexArray(uint prim,uint max_vertex_attrib)
         {
+            if(max_vertex_attrib>GetMaxVertexAttrib())
+                max_vertex_attrib=HGL_MAX_VERTEX_ATTRIBS;
+
             primitive=prim;
 
             vertex_buffer_list.PreMalloc(max_vertex_attrib);
@@ -90,5 +106,18 @@ namespace hgl
 
             return(-1);
         }
+
+        bool VertexArray::Draw()
+        {
+            if(element_buffer)
+                glDrawElements(primitive,0,element_buffer->GetCount(),element_buffer->GetDataType(),nullptr);
+            else
+            if(vertex_buffer)
+                glDrawArrays(primitive,0,vertex_buffer->GetCount());
+            else
+                return(false);
+
+            return(true);
+        }
     }//namespace graph
 }//namespace hgl