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#include "glarea.h"


#include <QString>

GLArea::GLArea(QWidget* parent)
 : QGLWidget(parent)
{
	m_zTransformation = 0;
	m_xRotation = 0;
	m_yRotation = 0;
	m_zRotation = 0;
}


GLArea::~GLArea()
{
}

void GLArea::initializeGL()
{	
	glClearColor(0.0, 0.0, 0.0, 0.0); // This clear the background color to black
    glShadeModel(GL_SMOOTH); // Type of shading for the polygons
   	
    // Viewport transformation
    glViewport(0,0, this->width(), this->height());

    // Projection transformation
    glMatrixMode(GL_PROJECTION); // Specifies which matrix stack is the target for matrix operations 
    glLoadIdentity(); // We initialize the projection matrix as identity
    gluPerspective(45.0f,(GLfloat)this->width()/(GLfloat)this->width(),10.0f,10000.0f); // We define the "viewing volume"
   
    glEnable(GL_DEPTH_TEST); // We enable the depth test (also called z buffer)
    glPolygonMode (GL_FRONT_AND_BACK, GL_FILL); // Polygon rasterization mode (polygon filled)
    
    glEnable(GL_TEXTURE_2D); // This Enable the Texture mapping

    Load3DS (&m_renderItem,"/home/david/Projects/oglblender/src/monkey.3ds");
}

void GLArea::resizeGL(int w, int h)
{
    glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // We clear both the color and the depth buffer so to draw the next frame
    glViewport(0,0,w,h); // Viewport transformation

    glMatrixMode(GL_PROJECTION); // Projection transformation
    glLoadIdentity(); // We initialize the projection matrix as identity
    gluPerspective(45.0f, (GLfloat)w / (GLfloat)h, 1000.0f, 10000.0f);

	glViewport (0, 0, (GLsizei) w, (GLsizei) h);
	
// 	glOrtho(-1.0, 1.0, -1.0, 1.0, -100.0, 100.0);
// 	glMatrixMode(GL_MODELVIEW);
// 	glLoadIdentity();
}

void GLArea::paintGL()
{
	int l_index;

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // This clear the background color to dark blue
    glMatrixMode(GL_PROJECTION); // Modeling transformation
    glLoadIdentity(); // Initialize the model matrix as identity
    
    glTranslatef(0.0,0.0, (GLfloat)m_zTransformation); // We move the object forward (the model matrix is multiplied by the translation matrix)
    printf("m_zTransformation: %d\n", m_zTransformation);

    glRotatef((GLfloat)m_xRotation,1.0,0.0,0.0); // Rotations of the object (the model matrix is multiplied by the rotation matrices)
    glRotatef((GLfloat)m_yRotation,0.0,1.0,0.0);
    glRotatef((GLfloat)m_zRotation,0.0,0.0,1.0);
    
    glColor3f (0.7, 1.0, 1.0);

    glBegin(GL_TRIANGLES); // glBegin and glEnd delimit the vertices that define a primitive (in our case triangles)
    for (l_index=0;l_index<m_renderItem.polygons_qty;l_index++)
    {
        //----------------- FIRST VERTEX -----------------
        // Texture coordinates of the first vertex
        glTexCoord2f( m_renderItem.mapcoord[ m_renderItem.polygon[l_index].a ].u,
                      m_renderItem.mapcoord[ m_renderItem.polygon[l_index].a ].v);
        // Coordinates of the first vertex
        glVertex3f( m_renderItem.vertex[ m_renderItem.polygon[l_index].a ].x,
                    m_renderItem.vertex[ m_renderItem.polygon[l_index].a ].y,
                    m_renderItem.vertex[ m_renderItem.polygon[l_index].a ].z); //Vertex definition

        //----------------- SECOND VERTEX -----------------
        // Texture coordinates of the second vertex
        glTexCoord2f( m_renderItem.mapcoord[ m_renderItem.polygon[l_index].b ].u,
                      m_renderItem.mapcoord[ m_renderItem.polygon[l_index].b ].v);
        // Coordinates of the second vertex
        glVertex3f( m_renderItem.vertex[ m_renderItem.polygon[l_index].b ].x,
                    m_renderItem.vertex[ m_renderItem.polygon[l_index].b ].y,
                    m_renderItem.vertex[ m_renderItem.polygon[l_index].b ].z);
        
        //----------------- THIRD VERTEX -----------------
        // Texture coordinates of the third vertex
        glTexCoord2f( m_renderItem.mapcoord[ m_renderItem.polygon[l_index].c ].u,
                      m_renderItem.mapcoord[ m_renderItem.polygon[l_index].c ].v);
        // Coordinates of the Third vertex
        glVertex3f( m_renderItem.vertex[ m_renderItem.polygon[l_index].c ].x,
                    m_renderItem.vertex[ m_renderItem.polygon[l_index].c ].y,
                    m_renderItem.vertex[ m_renderItem.polygon[l_index].c ].z);
    }
    glEnd();

    glFlush(); // This force the execution of OpenGL commands
}


void GLArea::wheelEvent(QWheelEvent * event)
{
	int numDegrees = event->delta() / 8;

	m_zTransformation += numDegrees;
	this->updateGL();
}

//slots
void GLArea::setXRotation(int rotation)
{
	m_xRotation = rotation;
	this->updateGL();
}

void GLArea::setYRotation(int rotation)
{
	m_yRotation = rotation;
	this->updateGL();
}

void GLArea::setZRotation(int rotation)
{
	m_zRotation = rotation;
	this->updateGL();
}