spk_sampler_object.hpp

#pragma once
 
#include "structure/design_pattern/spk_activable_object.hpp"
#include "structure/opengl/spk_opengl_includes.hpp"
#include "structure/opengl/spk_texture_object.hpp"
#include "utils/spk_opengl_utils.hpp"
#include <stdexcept>
 
namespace spk
{
    namespace OpenGL
    {
        class SamplerObject : public spk::ActivableObject
        {
        private:
            const TextureObject *_texture = nullptr;
            GLuint _textureUnitIndex;
            GLint _uniformLocation = -1;
            bool _uniformBound = false;
 
            void _ensureUniformIsBoundToUnit();
            void _ensureTextureIsBound();
            void _releaseTexture();
            void _registerCallbacks();
 
        public:
            explicit SamplerObject(GLint p_uniformLocation, GLuint p_textureUnitIndex = 0);
            SamplerObject(const SamplerObject &p_other);
            SamplerObject &operator=(const SamplerObject &p_other);

            void bind(const TextureObject *p_texture);
            void unbind();

            const TextureObject *texture() const;
        };
    }
}