X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Frender%2Finstancearray.h;fp=source%2Frender%2Finstancearray.h;h=627051f75b123a973ef878546fddd762708afe59;hb=7aaec9a70b8d7733429bec043f8e33e02956f266;hp=0000000000000000000000000000000000000000;hpb=bec07999d95b76f4b47cffcc564d0cd0afc0435e;p=libs%2Fgl.git

diff --git a/source/render/instancearray.h b/source/render/instancearray.h
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+++ b/source/render/instancearray.h
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+#ifndef MSP_GL_INSTANCEARRAY_H_
+#define MSP_GL_INSTANCEARRAY_H_
+
+#include <vector>
+#include "programdata.h"
+#include "renderable.h"
+
+namespace Msp {
+namespace GL {
+
+class Buffer;
+class Object;
+class ObjectInstance;
+class VertexArray;
+class VertexSetup;
+
+/**
+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.
+
+Changing the Mesh of the Object while an InstanceArray exists is not supported.
+*/
+class InstanceArray: public Renderable
+{
+public:
+	template<typename T>
+	class Instance: public T
+	{
+	private:
+		InstanceArray &array;
+		unsigned index;
+
+	public:
+		Instance(const Object &o, InstanceArray &a, unsigned i): T(o), array(a), index(i) { }
+
+		virtual void set_matrix(const Matrix &);
+	};
+
+private:
+	const Object &object;
+	std::vector<ObjectInstance *> instances;
+	VertexArray *instance_data;
+	Buffer *instance_buffer;
+	VertexSetup *vtx_setup;
+	int matrix_location;
+	unsigned matrix_offset;
+
+public:
+	InstanceArray(const Object &);
+	~InstanceArray();
+
+	void set_matrix_attribute(const std::string &);
+
+	template<typename T = ObjectInstance>
+	T &append();
+private:
+	void append(ObjectInstance *);
+	void update_instance_matrix(unsigned);
+public:
+	void remove(ObjectInstance &);
+
+	virtual void render(Renderer &, const Tag &) const;
+};
+
+template<typename T>
+T &InstanceArray::append()
+{
+	Instance<T> *inst = new Instance<T>(object, *this, instances.size());
+	append(inst);
+	return *inst;
+}
+
+template<typename T>
+void InstanceArray::Instance<T>::set_matrix(const Matrix &m)
+{
+	T::set_matrix(m);
+	array.update_instance_matrix(index);
+}
+
+} // namespace GL
+} // namespace Msp
+
+#endif