voxelcore/src/graphics/Framebuffer.cpp

#include "Framebuffer.h"

#include <GL/glew.h>
#include "Texture.h"

Framebuffer::Framebuffer(uint width, uint height, bool alpha) 
    : width(width), height(height) {
	glGenFramebuffers(1, &fbo);
	bind();
	GLuint tex;
	glGenTextures(1, &tex);
	glBindTexture(GL_TEXTURE_2D, tex);
    GLuint format = alpha ? GL_RGBA : GL_RGB;
	glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, nullptr);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, tex, 0);
    texture = new Texture(tex, width, height);
    glGenRenderbuffers(1, &depth);
    glBindRenderbuffer(GL_RENDERBUFFER, depth);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, width, height);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depth);
    unbind();
}

Framebuffer::~Framebuffer() {
	delete texture;
	glDeleteFramebuffers(1, &fbo);
    glDeleteRenderbuffers(1, &depth);
}

void Framebuffer::bind() {
	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
}

void Framebuffer::unbind() {
	glBindFramebuffer(GL_FRAMEBUFFER, 0);
}