CLK/Outputs/CRT/Internals/TextureTarget.cpp

//
//  TextureTarget.cpp
//  Clock Signal
//
//  Created by Thomas Harte on 07/02/2016.
//  Copyright © 2016 Thomas Harte. All rights reserved.
//

#include "TextureTarget.hpp"

using namespace OpenGL;

TextureTarget::TextureTarget(GLsizei width, GLsizei height) : _width(width), _height(height)
{
	glGenFramebuffers(1, &_framebuffer);
	glBindFramebuffer(GL_FRAMEBUFFER, _framebuffer);

	glGenTextures(1, &_texture);
	glBindTexture(GL_TEXTURE_2D, _texture);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei)width, (GLsizei)height, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, _texture, 0);

	if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
		throw ErrorFramebufferIncomplete;
}

TextureTarget::~TextureTarget()
{
	glDeleteFramebuffers(1, &_framebuffer);
	glDeleteTextures(1, &_texture);
}

void TextureTarget::bind_framebuffer()
{
	glBindFramebuffer(GL_FRAMEBUFFER, _framebuffer);
	glViewport(0, 0, _width, _height);
}

void TextureTarget::bind_texture()
{
	glBindTexture(GL_TEXTURE_2D, _texture);
}