#include "viewerglwidget.h"

#include <QOpenGLContext>
#include <QOpenGLFunctions>
#include <QOpenGLTexture>

#include "render/gl/glfunc.h"
#include "render/gl/shadergenerators.h"

ViewerGLWidget::ViewerGLWidget(QWidget *parent) :
  QOpenGLWidget(parent),
  texture_(0)
{
}

void ViewerGLWidget::SetTexture(GLuint tex)
{
  // Update the texture
  texture_ = tex;

  // Paint the texture
  update();
}

void ViewerGLWidget::initializeGL()
{
  // Re-retrieve pipeline pertaining to this context
  pipeline_ = olive::gl::GetDefaultPipeline();
}

void ViewerGLWidget::paintGL()
{
  // Get functions attached to this context (they will already be initialized)
  QOpenGLFunctions* f = context()->functions();

  // Clear background to empty
  f->glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
  f->glClear(GL_COLOR_BUFFER_BIT);

  // Check if we have a texture to draw
  if (texture_ > 0) {
    // Bind retrieved texture
    f->glBindTexture(GL_TEXTURE_2D, texture_);

    // Blit using the pipeline retrieved in initializeGL()
    olive::gl::Blit(pipeline_, true);

    // Release retrieved texture
    f->glBindTexture(GL_TEXTURE_2D, 0);
  }
}