SpriteBatch.h

/*
 * Gamedev Framework (gf)
 * Copyright (C) 2016-2021 Julien Bernard
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */
#ifndef GF_SPRITE_BATCH_H
#define GF_SPRITE_BATCH_H

#include <cstddef>
#include <array>

#include "GraphicsApi.h"
#include "RenderStates.h"
#include "Vertex.h"

namespace gf {
#ifndef DOXYGEN_SHOULD_SKIP_THIS
inline namespace v1 {
#endif

  class RenderTarget;
  class Sprite;
  class Texture;

  class GF_GRAPHICS_API SpriteBatch {
  public:
    SpriteBatch(RenderTarget& target);

    void begin();

    void draw(Sprite& sprite, const RenderStates& states = RenderStates());

    void draw(const Texture& texture, Vector2f position, const RenderStates& states = RenderStates());

    void draw(const Texture& texture, const RectF& textureRect, Vector2f position, const RenderStates& states = RenderStates());

    void end();

  private:
    void renderBatch();

  private:
    static constexpr std::size_t MaxSpriteCount = 1024;
    static constexpr std::size_t VerticesPerSprite = 6;
    static constexpr std::size_t MaxVertexCount = MaxSpriteCount * VerticesPerSprite;

    RenderTarget& m_target;
    RenderStates m_currentRenderStates;
    std::size_t m_count;
    std::array<Vertex, MaxVertexCount> m_vertices;
  };

#ifndef DOXYGEN_SHOULD_SKIP_THIS
}
#endif
}

#endif // GF_SPRITE_BATCH_H