Danny Calleri's version of NeHe's iOS OpenGL Lesson02

Lesson02.cpp

#include "Lesson02.h"

#import <OpenGLES/ES2/gl.h>
#import <OpenGLES/ES2/glext.h>
#include <vector>


Lesson02::Lesson02()
: shader(NULL),
  texture(NULL),
  sprite(NULL)
{
    
}

//lesson destructor
Lesson02::~Lesson02()
{

    delete sprite;
    delete shader;
    delete texture;
}

//initializing all OpenGL related things
void Lesson02::init()
{
    printf("Init..");
    
    //set the color we use for clearing our colorRenderbuffer to black
    glClearColor(0.3, 0.3, 0.3, 1.0);
    
    glEnable(GL_CULL_FACE);
    glEnable(GL_TEXTURE_2D);
    
    //loading the texture
    texture = new Texture();
    texture->loadPNG("background.png");
    
    //---------------------------------------------------
    //load our shader
    shader = new Shader("sprite_shader.vert", "sprite_shader.frag");
    
    if(!shader->compileAndLink())
    {
        printf("Encountered problems when loading shader, application will crash...");
    }
    
    sprite = new Sprite(texture, shader, 30, 30);
    
    //tell OpenGL to use this shader for all coming rendering
    glUseProgram(shader->getProgram());
    
    printf("Init done...");
    printf("\nBUFFER WIDTH  : %d\n", m_renderbufferWidth);
    printf("\nBUFFER HEIGHT : %d\n", m_renderbufferHeight);
}

//drawing a frame
void Lesson02::draw()
{
    //clear the color buffer
    glClear(GL_COLOR_BUFFER_BIT);
    
    sprite->render();
    
}