#ifndef SHADINGCONTEXT_H

#define SHADINGCONTEXT_H

#include <memory></memory>

// Glew include

#include <gl glew.h=""></gl>

// TnzCore includes

#include "traster.h"

// Qt includes

#include <qdatetime></qdatetime>

#include <qglframebufferobjectformat></qglframebufferobjectformat>

#undef DVAPI

#undef DVVAR

#ifdef TNZSTDFX_EXPORTS

#define DVAPI DV_EXPORT_API

#define DVVAR DV_EXPORT_VAR

#else

#define DVAPI DV_IMPORT_API

#define DVVAR DV_IMPORT_VAR

#endif

//=========================================================

//    Forward declarations

class QObject;

class QGLShaderProgram;

class QDateTime;

//=========================================================

class DVAPI ShadingContext

{

public:

	enum Support {

		OK,

		NO_PIXEL_BUFFER,

		NO_SHADERS

	};

public:

	ShadingContext();

	~ShadingContext();

	//! Returns the status of OpenGL shading support.

	static Support support();

	bool isValid() const;

	void makeCurrent();

	void doneCurrent();

	/*!

    Resizes the output buffer to the specified size. Requires that

    the contex is made current before invocation. In case lx or ly are 0,

    the context's output buffer is destroyed.

  */

	void resize(int lx, int ly,

				const QGLFramebufferObjectFormat &fmt = QGLFramebufferObjectFormat());

	QGLFramebufferObjectFormat format() const;

	TDimension size() const;

	//! Surrenders ownership of the supplied shader program to the shading context.

	void addShaderProgram(const QString &shaderName, QGLShaderProgram *program);

	void addShaderProgram(const QString &shaderName, QGLShaderProgram *program,

						  const QDateTime &lastModified);

	bool removeShaderProgram(const QString &shaderName);

	QGLShaderProgram *shaderProgram(const QString &shaderName) const;

	QDateTime lastModified(const QString &shaderName) const;

	std::pair<qglshaderprogram *,="" qdatetime=""> shaderData(const QString &shaderName) const;</qglshaderprogram>

	GLuint loadTexture(const TRasterP &src, GLuint texUnit); //!< Loads a texture and binds it to the specified texture unit.

															 //!  \return  The OpenGL texture id of the loaded texture.      \param src  Loaded texture.  \param texUnit  Unit the texture will be bound to.

	void unloadTexture(GLuint texId);						 //!< Releases the specified texture id.

	//! Renders the active shader program to the specified raster.

	void draw(const TRasterP &dst);

	//! Performs transform feedback with the specified varying variables

	void transformFeedback(int varyingsCount, const GLsizeiptr *varyingSizes,

						   GLvoid **bufs);

private:

	struct Imp;

	std::unique_ptr<imp> m_imp;</imp>

	// Not copyable

	ShadingContext(const ShadingContext &);

	ShadingContext &operator=(const ShadingContext &);

};

#endif // SHADINGCONTEXT_H