#include <GL/glut.h>    // Header File For The GLUT Library
#include <GL/gl.h>  // Header File For The OpenGL32 Library
#include <GL/glu.h> // Header File For The GLu32 Library
#include <unistd.h>     // needed to sleep
#include <math.h>
#include <stdio.h>
#include "SOIL.h"
GLfloat rotate=0.0,rotatey=0.0;

#define ESCAPE 27
int texture[2];

int window;
int LoadGLTextures(){
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
    texture[0] = SOIL_load_OGL_texture
        (
        "media/lena.bmp",
        SOIL_LOAD_AUTO,
        SOIL_CREATE_NEW_ID,
        SOIL_FLAG_INVERT_Y
        );

    if(texture[0] == 0)
        return 0;
    glBindTexture(GL_TEXTURE_2D, texture[0]);

    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);

    return 1;                                        // Return Success
}

void InitGL(int Width, int Height){
    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
    LoadGLTextures();
    glClearDepth(1.0);
    glDepthFunc(GL_LESS);
    glEnable(GL_DEPTH_TEST);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(-10,10,-((GLfloat)Width/(GLfloat)Height) * 10,((GLfloat)Width/(GLfloat)Height) * 10, 0, 10);
    //gluPerspective(45.0f,(GLfloat)Width/(GLfloat)Height,0.01f,100.0f);
    glMatrixMode(GL_MODELVIEW);
}

/* The function called when our window is resized (which shouldn't happen, because we're fullscreen) */
void ReSizeGLScene(int Width, int Height)
{
    if (Height==0)        // Prevent A Divide By Zero If The Window Is Too Small
       Height=1;

    glViewport(0, 0, Width, Height);    // Reset The Current Viewport And Perspective Transformation
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    //gluPerspective(45.0f,(GLfloat)Width/(GLfloat)Height,0.1f,100.0f);
    glOrtho(-10,10,-((GLfloat)Width/(GLfloat)Height) * 10,((GLfloat)Width/(GLfloat)Height) * 10, 0, 10);
    glMatrixMode(GL_MODELVIEW);
}

void drawLado()
{
    glEnable(GL_TEXTURE_2D);

    glBindTexture(GL_TEXTURE_2D, texture[0]);   // choose the texture to use.
    glTranslatef(0.0f,0.0f,-0.0f);              // move 5 units into the screen.

    glBegin(GL_QUADS);

    // Front Face (note that the texture's corners have to match the quad's corners)
    glTexCoord2f(0.0f, 0.0f); glVertex3f(-0.5f, -0.5f,  1.0f); // Bottom Left Of The Texture and Quad
    glTexCoord2f(1.0f, 0.0f); glVertex3f(0.5f, -0.5f,  1.0f); // Bottom Right Of The Texture and Quad
    glTexCoord2f(1.0f, 1.0f); glVertex3f(0.5f, 0.5f,  1.0f); // Top Right Of The Texture and Quad
    glTexCoord2f(0.0f, 1.0f); glVertex3f(-0.5f, 0.5f,  1.0f); // Top Left Of The Texture and Quad

    // Back Face
    glTexCoord2f(1.0f, 0.0f); glVertex3f(0.5f, -0.5f,  -1.0f);    // Bottom Right Of The Texture and Quad
    glTexCoord2f(1.0f, 1.0f); glVertex3f(0.5f, 0.5f,  -1.0f);    // Top Right Of The Texture and Quad
    glTexCoord2f(0.0f, 1.0f); glVertex3f(-0.5f, 0.5f,  -1.0f);    // Top Left Of The Texture and Quad
    glTexCoord2f(0.0f, 0.0f); glVertex3f(-0.5f, -0.5f,  -1.0f);    // Bottom Left Of The Texture and Quad

    // Top Face
    glTexCoord2f(0.0f, 1.0f); glVertex3f(-0.5f, 0.5f,  -1.0f);     // Top Left Of The Texture and Quad
    glTexCoord2f(0.0f, 0.0f); glVertex3f(-0.5f, -0.5f,  1.0f);    // Bottom Left Of The Texture and Quad
    glTexCoord2f(1.0f, 0.0f); glVertex3f(0.5f, -0.5f,  1.0f);    // Bottom Right Of The Texture and Quad
    glTexCoord2f(1.0f, 1.0f); glVertex3f(0.5f, 0.5f, -1.0f);    // Top Right Of The Texture and Quad

    // Bottom Face
    glTexCoord2f(1.0f, 1.0f); glVertex3f(0.5f, 0.5f, -1.0f);    // Top Right Of The Texture and Quad
    glTexCoord2f(0.0f, 1.0f); glVertex3f(-0.5f, 0.5f,  -1.0f);    // Top Left Of The Texture and Quad
    glTexCoord2f(0.0f, 0.0f); glVertex3f(-0.5f, -0.5f,  1.0f);    // Bottom Left Of The Texture and Quad
    glTexCoord2f(1.0f, 0.0f); glVertex3f(0.5f, -0.5f,  1.0f);     // Bottom Right Of The Texture and Quad

    // Right face
    glTexCoord2f(1.0f, 0.0f); glVertex3f(0.5f, -0.5f,  -1.0f);    // Bottom Right Of The Texture and Quad
    glTexCoord2f(1.0f, 1.0f); glVertex3f(0.5f, 0.5f, -1.0f);      // Top Right Of The Texture and Quad
    glTexCoord2f(0.0f, 1.0f); glVertex3f(-0.5f, 0.5f,  1.0f);    // Top Left Of The Texture and Quad
    glTexCoord2f(0.0f, 0.0f); glVertex3f(-0.5f, -0.5f,  1.0f);    // Bottom Left Of The Texture and Quad

    // Left Face
    glTexCoord2f(0.0f, 0.0f); glVertex3f(-0.5f, -0.5f,  -1.0f); // Bottom Left Of The Texture and Quad
    glTexCoord2f(1.0f, 0.0f); glVertex3f(0.5f, -0.5f,  1.0f); // Bottom Right Of The Texture and Quad
    glTexCoord2f(1.0f, 1.0f); glVertex3f(0.5f, 0.5f, 1.0f); // Top Right Of The Texture and Quad
    glTexCoord2f(0.0f, 1.0f); glVertex3f(-0.5f, 0.5f,  -1.0f); // Top Left Of The Texture and Quad

    glEnd();
    glDisable(GL_TEXTURE_2D);
}

void DrawGLScene()
{
    glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT); // Clear The Screen And The Depth Buffer
    glRotatef(rotate,1.0,0.0,0.0);
    glRotatef(rotatey,0.0,1.0,0.0);
    glPushMatrix(); //  Salva a matriz corrente
    drawLado();
    glPopMatrix();
    //glutSolidCube(1.0f);
    glFlush();
    glutSwapBuffers();
}

/* The function called whenever a key is pressed. */
void keyboardCB( unsigned char key, int x, int y )
{
    switch (key){
        case 27: // ESC
            exit (0);
            break;
        case 97:
            rotate += 1.0f;
            break;
        case 115:
            rotatey += 1.0f;
            break;
    }
  // glutPostRedisplay();
}



int main(int argc, char **argv)
{

    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_ALPHA | GLUT_DEPTH);
    glutInitWindowSize(500,500);
    glutInitWindowPosition(0, 0);
    window = glutCreateWindow("Pratica 028 - Plano de Fundo");
    // glutFullScreen();

    glutSetCursor(GLUT_CURSOR_NONE);


    glutDisplayFunc(&DrawGLScene);
    glutIdleFunc(&DrawGLScene);
    glutReshapeFunc(&ReSizeGLScene);
    glutKeyboardFunc(keyboardCB);
    InitGL(500, 500);
    glutMainLoop();

    return 1;
}