#include "ltpch.h"
#include "glBlender.h"

#include <glad/glad.h>

namespace Light {

	glBlender::glBlender()
	{
		m_FactorMap = {
			// constants
			{ BlendFactor::ZERO, GL_ZERO },
			{ BlendFactor::ONE, GL_ZERO },

			// source
			{ BlendFactor::SRC_COLOR, GL_SRC_COLOR },
			{ BlendFactor::INVERSE_SRC_COLOR, GL_ONE_MINUS_SRC_COLOR },

			{ BlendFactor::SRC_ALPHA, GL_SRC_ALPHA },
			{ BlendFactor::INVERSE_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA },

			// destination
			{ BlendFactor::DST_COLOR, GL_DST_COLOR },
			{ BlendFactor::INVERSE_DST_COLOR, GL_ONE_MINUS_DST_COLOR },

			{ BlendFactor::DST_ALPHA, GL_DST_ALPHA },
			{ BlendFactor::INVERSE_DST_ALPHA, GL_ONE_MINUS_DST_ALPHA },

			// source1
			{ BlendFactor::SRC1_COLOR, GL_SRC1_COLOR },
			{ BlendFactor::INVERSE_SRC1_COLOR, GL_ONE_MINUS_SRC1_COLOR },

			{ BlendFactor::SRC1_ALPHA, GL_SRC1_ALPHA },
			{ BlendFactor::INVERSE_SRC1_ALPHA, GL_ONE_MINUS_SRC_ALPHA }
		};
	}

	void glBlender::Enable(BlendFactor srcFactor, BlendFactor dstFactor)
	{
		glEnable(GL_BLEND);
		glBlendFunc(m_FactorMap[srcFactor], m_FactorMap[dstFactor]);
	}

	void glBlender::Disable()
	{
		glDisable(GL_BLEND);
	}

}