#include <glew/glew.h>
#include "myglwidget.h"
#include "sparrowrenderer.h"
#include "glassert.h"
#include <iostream>
#include <glm/glm.hpp>

MyGLWidget::MyGLWidget(QWidget *parent) :
    QGLWidget(parent),
    renderer(NULL)
{

}

MyGLWidget::~MyGLWidget()
{
    if(renderer != NULL)
        delete(renderer);
}

void MyGLWidget::initializeGL()
{
    makeCurrent();

    GLenum err = glewInit(); // init and check glew
    if (GLEW_OK != err)
    {
        std::cerr << "Warning: glewInit failed!" << std::endl;
    }
    if (!GLEW_ARB_vertex_program   ||
        !GLEW_ARB_fragment_program ||
        !GLEW_ARB_texture_float    ||
        !GLEW_ARB_draw_buffers     ||
        !GLEW_ARB_framebuffer_object)
    {
        std::cerr << "Warning: Shaders not supported!" << std::endl;
    }

    std::cout << "OpenGL version " << glGetString(GL_VERSION) << std::endl;
    std::cout << "GLSL version " << glGetString(GL_SHADING_LANGUAGE_VERSION) << std::endl;
    std::cout.flush();

    glAssert(glEnable(GL_DEPTH_TEST));
    glAssert(glEnable(GL_CULL_FACE));
    glAssert(glEnable(GL_TEXTURE_2D));
    glAssert(glViewport(0, 0, width(), height()));

    renderer = new SparrowRenderer(width(), height());
}

void MyGLWidget::resizeGL(int width, int height)
{
    glAssert(glViewport(0, 0, width, height));
    renderer->resize(width, height);
    updateGL();
}

void MyGLWidget::paintGL()
{
    glAssert(glClearColor(0.60, 0.65, 0.75, 1.0));
    glAssert(glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT));
    renderer->render();
}