RenderTarget.hpp

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/*
 * =====================================================================================
 *
 *       Filename:  RenderTarget.hpp
 *
 *    Description:
 *
 *        Created:  14/06/2018 19:54:56
 *
 *         Author:  Quentin Bazin, <quent42340@gmail.com>
 *
 * =====================================================================================
 */
#ifndef GK_RENDERTARGET_HPP_
#define GK_RENDERTARGET_HPP_

#include "gk/core/Rect.hpp"
#include "gk/gl/OpenGL.hpp"
#include "gk/gl/RenderStates.hpp"
#include "gk/gl/View.hpp"

namespace gk {

class IDrawable;
class VertexBuffer;

class RenderTarget {
    public:
        void draw(const IDrawable &drawable, const RenderStates &states = RenderStates::Default);
        void draw(const VertexBuffer &vertexBuffer, GLenum mode, std::size_t firstVertex, std::size_t vertexCount, const RenderStates &states = RenderStates::Default);
        void drawElements(const VertexBuffer &vertexBuffer, GLenum mode, GLsizei count, GLenum type, const GLvoid *indices, const RenderStates &states = RenderStates::Default);

        virtual Vector2u getSize() const = 0;

        virtual const View &getDefaultView() const = 0;

        const View *getView() const { return m_view; }
        void setView(const View &view) { m_view = &view; m_viewChanged = true; }
        void disableView() { m_view = nullptr; }

    private:
        void beginDrawing(const RenderStates &states);
        void endDrawing(const RenderStates &states);

        IntRect getViewport(const View &view) const;

        void applyCurrentView(const RenderStates &states);

        bool m_viewChanged = false;
        const View *m_view = nullptr;

        IntRect m_previousViewport;
};

} // namespace gk

#endif // GK_RENDERTARGET_HPP_