ShaderProgram.h
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ShaderProgram.h
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	#ifndef _ECHOSHADERPROGRAM_H_
	#define _ECHOSHADERPROGRAM_H_

	#include <echo/Types.h>
	#include <echo/Graphics/VertexShader.h>
	#include <echo/Graphics/FragmentShader.h>
	#include <echo/Maths/Matrix4.h>
	#include <map>

	namespace Echo
	{
	//An internal structure for managing the shader resource
	class ShaderProgramResource;
	class ShaderProgramVariable;

	class ShaderProgram
	{
	public:
	//The constructor should allocate and/or assign the EShaderProgramResource
	ShaderProgram();
	~ShaderProgram();

	ShaderProgramResource* GetShaderProgramResource() const { return mShaderProgramResource; }
	void SetShaderResource(ShaderProgramResource* val) { mShaderProgramResource = val; }

	// Adds a fragment shader
	bool AddFragmentShader(shared_ptr<FragmentShader> shader);

	//Adds vertex shader to be later linked
	bool AddVertexShader(shared_ptr<VertexShader> shader);

	//Links this program
	bool Link();

	//Setting active assigns all of the variables.
	void SetActive();
	void SetInactive();

	//Setting an attribute stream passes a pointer to a stream of data that will be used for vertex attributes
	//when the program is set to active. The streams must contain as much data as there are vertices.
	bool SetFloatAttributeStream(const std::string& name, float* stream);
	bool SetVector2AttributeStream(const std::string& name, Vector2* stream);
	bool SetVector3AttributeStream(const std::string& name, Vector3* stream);
	bool SetVector4AttributeStream(const std::string& name, Vector4* stream);

	//These Get methods return a shared pointer that points to a value that can be changed so that when the program is
	//set to active the value of the variables at that time will be the values of the uniform variables.
	shared_ptr<float> GetFloat(const std::string& name);
	shared_ptr<s32> GetInteger(const std::string& name);
	shared_ptr<bool> GetBoolean(const std::string& name);
	shared_ptr<Vector2> GetVector2(const std::string& name);
	shared_ptr<Vector3> GetVector3(const std::string& name);
	shared_ptr<Vector4> GetVector4(const std::string& name);
	shared_ptr<Matrix3> GetMatrix3(const std::string& name);
	shared_ptr<Matrix4> GetMatrix4(const std::string& name);

	std::string GetErrors();
	private:
	std::string m_Source;
	bool mLinked;
	bool mActive;
	ShaderProgramResource* mShaderProgramResource;
	std::map < std::string, ShaderProgramVariable* > mUniformProgramVariables;
	std::map < std::string, ShaderProgramVariable* > mAttributeProgramVariables;
	};
	}
	#endif

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