#include "framebuffer.h"
#include "texture.h"
#include "glassert.h"

const FrameBuffer* FrameBuffer::screen = new FrameBuffer(0);

FrameBuffer::FrameBuffer()
{
    glAssert(glGenFramebuffers(1, &fbo));
}

FrameBuffer::~FrameBuffer()
{
    if(fbo != 0)
        glAssert(glDeleteFramebuffers(1, &fbo));
}

void FrameBuffer::addTexture(Texture* tex, GLenum attachment)
{
    if(fbo != 0)
    {
        textures.push_back(tex);
        bindFBO();
        glAssert(glFramebufferTexture2D(GL_FRAMEBUFFER, attachment, tex->getTarget(), tex->getId(), 0));
        attachments.push_back(attachment);
    }
}

void FrameBuffer::initGL()
{
    if(fbo != 0)
    {
        bindFBO();
        glAssert(glDrawBuffers(attachments.size(), attachments.data()));
    }
}

void FrameBuffer::bindFBO() const
{
    glAssert(glBindFramebuffer(GL_FRAMEBUFFER, fbo));
}

Texture* FrameBuffer::getTexture(int texId)
{
    if(fbo != 0)
        return textures[texId];
    else
        return NULL;
}