#ifndef SOFTWARECANVASRENDERER_H
#define SOFTWARECANVASRENDERER_H

#include "software_global.h"

#include "SoftwareRenderer.h"

namespace paysages {
namespace software {

/**
 * @brief Software rendering inside a Canvas surface.
 *
 * This class launches the rasterization process into canvas portions and
 * redirects post processing to the software renderer.
 *
 * It tries to keep a canvas portion rasterized ahead of the post processing.
 */
class SOFTWARESHARED_EXPORT SoftwareCanvasRenderer: public SoftwareRenderer
{
public:
    SoftwareCanvasRenderer(Scenery *scenery);
    virtual ~SoftwareCanvasRenderer();

    inline const Canvas *getCanvas() const {return canvas;}
    inline RenderProgress *getProgressHelper() const {return progress;}
    inline bool isFinished() const {return finished;}

    inline Rasterizer *getSkyRasterizer() const {return rasterizer_sky;}
    inline Rasterizer *getWaterRasterizer() const {return rasterizer_water;}
    inline Rasterizer *getTerrainRasterizer() const {return rasterizer_terrain;}
    inline Rasterizer *getVegetationRasterizer() const {return rasterizer_vegetation;}

    virtual void setQuality(double factor) override;

    /**
     * Clear the rasterizers list, and put a single one.
     */
    void setSoloRasterizer(Rasterizer *rasterizer);

    /**
     * Get the global rendering progress (0.0-1.0).
     */
    double getProgress() const;

    /**
     * Set the renderer configuration.
     */
    void setConfig(const RenderConfig &config);

    /**
     * Enable or disable the post processing.
     */
    void enablePostprocess(bool enabled);

    /**
     * @brief Set the rendering size in pixels.
     *
     * Set 'samples' to something bigger than 1 to allow for the multi-sampling of pixels.
     */
    void setSize(int width, int height, int samples=1);

    /**
     * @brief Start the two-pass render process.
     */
    void render();

    /**
     * @brief Interrupt the render process.
     */
    void interrupt();

    /**
     * Get a rasterizer by its client id.
     */
    const Rasterizer &getRasterizer(int client_id) const;

    /**
     * Save the rendered canvas to a picture file on disk.
     *
     * Returns true if the save was successful.
     */
    bool saveToDisk(const std::string &filepath) const;

protected:
    /**
     * @brief Rasterize the scenery into a canvas portion.
     */
    void rasterize(CanvasPortion *portion);

    /**
     * @brief Apply pixel shader to fragments stored in the CanvasPortion.
     */
    void applyPixelShader(CanvasPortion *portion);

private:
    RenderProgress *progress;

    Canvas *canvas;
    int samples;

    std::vector<Rasterizer *> rasterizers;
    Rasterizer *rasterizer_sky;
    Rasterizer *rasterizer_water;
    Rasterizer *rasterizer_terrain;
    Rasterizer *rasterizer_vegetation;

    bool started;
    bool finished;
    bool interrupted;

    bool postprocess_enabled;

    ParallelWork *current_work;
};

}
}

#endif // SOFTWARECANVASRENDERER_H