#define MSP_GL_INSTANCEARRAY_H_
#include <vector>
+#include <msp/core/noncopyable.h>
#include "programdata.h"
#include "renderable.h"
#include "vertexarray.h"
class ObjectInstance;
/**
-Renders multiple instances of an Object in an efficient manner. If instanced
-rendering is supported, only one draw call per Batch needs to be issued.
+Renders multiple instances of an Object in an efficient manner.
-Changing the Mesh of the Object while an InstanceArray exists is not supported.
+The instance specific transform is passed to the shader in an attribute with
+the name instance_transform. The attribute should have the type vec4[3]. Each
+elements of the array corresponds to a row of the transform matrix.
+
+If the Mesh or Technique of the Object is changed during the lifetime of the
+InstanceArray, behaviour is undefined.
*/
-class InstanceArray: public Renderable
+class InstanceArray: public Renderable, public NonCopyable
{
public:
template<typename T>
void set_matrix_attribute(const std::string &);
+ /** Adds a new instance to the array. The instance class must have a
+ constructor taking a const reference to Object as its sole parameter. */
template<typename T = ObjectInstance>
T &append();
private: