canvas.h

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#ifndef UGDK_GRAPHIC_CANVAS_H_
#define UGDK_GRAPHIC_CANVAS_H_

#include <ugdk/graphic/drawmode.h>
#include <ugdk/graphic/manager.h>
#include <ugdk/math/vector2D.h>
#include <ugdk/math/geometry.h>
#include <ugdk/structure/visualeffect.h>
#include <ugdk/structure/types.h>

#include <ugdk/desktop.h>
#include <ugdk/graphic.h>

#include <memory>
#include <vector>

namespace ugdk {
namespace graphic {

class Canvas {
  public:
    Canvas(RenderTarget* render_target);
    ~Canvas();

    void ChangeShaderProgram(const ShaderProgram* shader_program);

    bool IsActive() const;
    math::Vector2D size() const;
    const math::Geometry& current_geometry() const { return geometry_stack_.back(); }
    const structure::VisualEffect& current_visualeffect() const { return visualeffect_stack_.back(); }
    const ShaderProgram* shader_program() const { return shader_program_; }

    void PushAndCompose(const math::Geometry& geometry);
    void PushAndCompose(const structure::VisualEffect& effect);

    void PopGeometry();
    void PopVisualEffect();

    //
    void Clear(structure::Color);
    
    // Shader variables.

    void SendUniform(const std::string& name, float t1);
    void SendUniform(const std::string& name, float t1, float t2);
    void SendUniform(const std::string& name, const math::Vector2D&);
    void SendUniform(const std::string& name, float t1, float t2, float t3);
    void SendUniform(const std::string& name, float t1, float t2, float t3, float t4);
    void SendUniform(const std::string& name, const TextureUnit& unit);

    void SendVertexData(const VertexData& data, VertexType type, size_t offset, int size = 2,
                        int vertex_per_data = 1);

    // Drawing
    void DrawArrays(DrawMode, int first_vertex, int vertex_count);

  private:
    void Bind();
    void Unbind();
    void SendGeometry();
    void SendEffect();

    RenderTarget* render_target_;
    std::vector<math::Geometry> geometry_stack_;
    std::vector<structure::VisualEffect> visualeffect_stack_;
    const ShaderProgram* shader_program_;
    Canvas* previous_canvas_;
    Canvas* next_canvas_;
};

}  // namespace graphic
}  // namespace ugdk

#endif // UGDK_GRAPHIC_CANVAS_H_