RenderTarget.hpp

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#pragma once
 
#include "gl.h"
#include <ivorium_core/ivorium_core.hpp>
#include <array>
 
namespace iv
{
 
class RenderTarget
{
public:
    static const constexpr int MaxTexturingUnits = 2;
 
    struct Geometry
    {
        int2 size;
        
        float  density;
        
        Geometry();
        Geometry( float2 size, float density );
    };
 
public:
                    RenderTarget();
    virtual         ~RenderTarget(){}
    
    // depth buffer
    void            DepthBufferClear( float value );
    void            DepthBufferMode( GLenum test_condition, bool write_enabled );       
    
    // blending
    void            Blending( bool enabled );
    
    // geometry
    Geometry        geometry() const;
    
    // state control
    void            bind_texture( int texture_unit, GLuint texture_id );
    void            bind_shader( GLuint program_id );
    
protected:
    void            frame_setup();
    
    void            frame_close();
    
    void            set_geometry( Geometry geometry );
    
private:
    void            ClearDepthBuffer();
    
private:
    Geometry                                    _geometry;
    
    // state cache
    int                                         _texture_unit;      
    std::array< GLuint, MaxTexturingUnits >     _texture_ids;       
    GLuint                                      _program_id;        
};
 
}