mesa: added _ElementSize field to gl_client_array

Will be handy for bounds checking later...

src/mesa/main/mtypes.h

@@ -1541,6 +1541,7 @@ struct gl_client_array
    const GLubyte *Ptr;          /**< Points to array data */
    GLboolean Enabled;		/**< Enabled flag is a boolean */
    GLboolean Normalized;        /**< GL_ARB_vertex_program */
+   GLuint _ElementSize;         /**< size of each element in bytes */
 
    struct gl_buffer_object *BufferObj;/**< GL_ARB_vertex_buffer_object */
    GLuint _MaxElement;          /**< max element index into array buffer */

src/mesa/main/varray.c

@@ -63,6 +63,8 @@ update_array(GLcontext *ctx, struct gl_client_array *array,
    array->StrideB = stride ? stride : elementSize;
    array->Normalized = normalized;
    array->Ptr = (const GLubyte *) ptr;
+   array->_ElementSize = elementSize;
+
 #if FEATURE_ARB_vertex_buffer_object
    _mesa_reference_buffer_object(ctx, &array->BufferObj,
                                  ctx->Array.ArrayBufferObj);