buffer_image.h

/*
 * GLViewer is a simple interface for opengl by handling the GLCore library 
 * 
 */

#pragma once
#include "glviewer_common.h"

  
namespace GLViewer {

// Forward declare
class Viewer;

// Identifier for a image buffer
struct ImageBufferID {
    ImageBufferID(uint ID) : id(ID) {}
    uint id;
};


// A renderable image element
class RenderableImage
{
public:
    // Don't construct directly, create with factory
    RenderableImage(Viewer* viewer, ImageTexture texture, const glm::vec2& position2d, const glm::vec2& size, const glm::vec4& colour);
    RenderableImage(Viewer* viewer, ImageTexture texture, const glm::vec3& position3d, const glm::vec2& size, const glm::vec4& colour);
    
private:
    
    ImageTexture m_Texture;
    glm::vec2 m_Position; 
    glm::vec2 m_Size; 
    glm::vec4 m_Colour;
	
    bool m_Valid = false;
    
    void Render();
    
    friend class ImageBuffer;
};


// An image buffer to render image elements
class ImageBuffer
{
public:
    
    void Add2DImage(ImageTexture texture, const glm::vec2& position2d, const glm::vec2& size, const glm::vec4& colour = { 1.0f, 1.0f, 1.0f, 1.0f });
    void Add3DImage(ImageTexture texture, const glm::vec3& position3d, const glm::vec2& size, const glm::vec4& colour = { 1.0f, 1.0f, 1.0f, 1.0f });
	
    // Don't construct directly, create with factory
    ImageBuffer(Viewer* viewer);
    
private:
    
    void ClearAll();
    
    void SetData(std::function<void(ImageBuffer&)> cb_AddData);
    
    void Render();
    
    Viewer* m_Parent;
    ImageBufferID m_ID;
    std::vector<RenderableImage> m_Images;
    
    friend class Buffers;
};


} // End namespace GLViewer