/* ================================================================
RenderView
----------------
This file defines our RenderView object.
================================================================ */
#include "RenderView.hpp"
#include "Log.hpp"
/* ======== Constructors and Destructors ======== */
RenderView::RenderView(int width, int height) {
  fbo = fbo_depth = fbo_tex = 0;
  w = width;
  h = height;
  x = y = 0;
  flags = 0;
  mesh = NULL;
  program = NULL;
  createView(width, height);
}
RenderView::~RenderView() {
  destroyView();
  if (mesh != NULL) delete mesh;
}
/* ======== Getters ======== */
GLuint RenderView::getFBO() {
  return fbo;
}
GLuint RenderView::getTex() {
  return fbo_tex;
}
Mesh *RenderView::getMesh() {
  return mesh;
}
Program* RenderView::getProgram() {
  return program;
}
/* ======== Setters ======== */
int RenderView::createView(int width, int height) {
  // TODO: call destroyView() and create new FBO at width and height
  // ================ create depth buffer
  glGenRenderbuffers(1, &fbo_depth);
  glBindRenderbuffer(GL_RENDERBUFFER, fbo_depth);
#if defined(HAVE_OPENGLES)
  glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, width, height);
#else
  glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, width, height);
#endif
  glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, fbo_depth);
  // unbind the render buffer
  glBindRenderbuffer(GL_RENDERBUFFER, 0);
  // ================ create texture
  glGenTextures(1, &fbo_tex);
  glBindTexture(GL_TEXTURE_2D, fbo_tex);
  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
  // add some filters (... move this)
  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  // unbind texture
  glBindTexture(GL_TEXTURE_2D, 0);
  // ================ create framebuffers
  glGenFramebuffers(1, &fbo);
  glBindFramebuffer(GL_FRAMEBUFFER, fbo);
  // attach texture to framebuffer
  glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fbo_tex, 0);
  // attach depth render buffer
  glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, fbo_depth);
  GLenum status;
  if ((status = glCheckFramebufferStatus(GL_FRAMEBUFFER)) != GL_FRAMEBUFFER_COMPLETE) {
    GLenum error = glGetError();
    LOG(LOG_ERROR) << FUNC_NAME << " " << status << " " << error << " " << "Failed to create Framebuffer!";
    glBindFramebuffer(GL_FRAMEBUFFER, 0);
    return 1;
  }
  flags |= RENDERVIEW_ACTIVE;
  // unbind our frame buffer
  glBindFramebuffer(GL_FRAMEBUFFER, 0);
  // ================ create quad mesh
  // Load our default quad mesh
  Vec3 quad[6] = {
    Vec3(-1.0f, -1.0f, 0.0f),
    Vec3(1.0f, -1.0f, 0.0f),
    Vec3(-1.0f, 1.0f, 0.0f),
    Vec3(-1.0f, 1.0f, 0.0f),
    Vec3(1.0f, -1.0f, 0.0f),
    Vec3(1.0f, 1.0f, 0.0f)
  };
  mesh = new Mesh(quad, 6, NULL, 0, NULL, 0);
  mesh->buildMesh();
  w = width; h = height;
  return 0;
}
int RenderView::destroyView() {
  if ((flags & RENDERVIEW_ACTIVE) == 0) return 1;
  glDeleteFramebuffers(1, &fbo);
  glDeleteTextures(1, &fbo_tex);
  glDeleteRenderbuffers(1, &fbo_depth);
  delete mesh;
  flags &= ~RENDERVIEW_ACTIVE;
  return 0;
}
int RenderView::setView(int width, int height) {
  if ((flags & RENDERVIEW_ACTIVE) == 0) return 1;
  // resize depth buffer
  glBindRenderbuffer(GL_RENDERBUFFER, fbo_depth);
#if defined(HAVE_OPENGLES)
  glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, width, height);
#else
  glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, width, height);
#endif
  glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, fbo_depth);
  glBindRenderbuffer(GL_RENDERBUFFER, 0);
  // resize texture
  glBindTexture(GL_TEXTURE_2D, fbo_tex);
  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
  glBindTexture(GL_TEXTURE_2D, 0);
  w = width;
  h = height;
  return 0;
}
int RenderView::setProgram(Program *program_) {
  program = program_;
  return 0;
}