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

FrameBuffer::FrameBuffer(bool isNULL)
{
    if(isNULL)
        fbo = 0;
    else
        glAssert(glGenFramebuffers(1, &fbo));
}

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

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

void FrameBuffer::initGL()
{
    bindFBO();
    glAssert(glDrawBuffers(attachments.size(), attachments.data()));
}

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

Texture* FrameBuffer::getTexture(int texId)
{
    return textures[texId];
}

FrameBuffer* FrameBuffer::getScreen()
{
    static FrameBuffer* screen = NULL;
    if(screen == NULL)
        screen = new FrameBuffer(true);
    return screen;
}