#include "OpenGLRenderer.h"

#include <QOpenGLFunctions>
#include <cmath>
#include <GL/gl.h>
#include <GL/glu.h>
#include "Scenery.h"
#include "CameraDefinition.h"
#include "OpenGLSkybox.h"

OpenGLRenderer::OpenGLRenderer(Scenery* scenery):
    SoftwareRenderer(scenery)
{
    skybox = new OpenGLSkybox(this);
}

OpenGLRenderer::~OpenGLRenderer()
{
    delete skybox;
}

void OpenGLRenderer::initialize()
{
    glClearColor(0.0, 0.0, 0.0, 0.0);

    glDisable(GL_LIGHTING);

    glFrontFace(GL_CCW);
    glCullFace(GL_BACK);
    glEnable(GL_CULL_FACE);

    glDepthFunc(GL_LESS);
    glDepthMask(1);
    glEnable(GL_DEPTH_TEST);

    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
    glEnable(GL_LINE_SMOOTH);
    glLineWidth(1.0);

    glDisable(GL_FOG);

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    prepare();

    functions = new QOpenGLFunctions();

    skybox->initialize();
    skybox->updateScenery();
}

void OpenGLRenderer::resize(int width, int height)
{
    CameraPerspective perspective;

    glViewport(0, 0, width, height);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    perspective = render_camera->getPerspective();
    gluPerspective(perspective.yfov * 180.0 / M_PI, perspective.xratio, perspective.znear, perspective.zfar);

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}

void OpenGLRenderer::paint()
{
    glClearColor(0.0, 0.0, 0.0, 0.0);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    skybox->render();
}

void OpenGLRenderer::cameraChangeEvent(CameraDefinition *camera)
{
    skybox->updateCamera(camera);
}

double OpenGLRenderer::getPrecision(const Vector3 &)
{
    return 0.0000001;
}

Color OpenGLRenderer::applyMediumTraversal(Vector3, Color color)
{
    return color;
}