// Copyright (c) 2022 Dominic Masters
// 
// This software is released under the MIT License.
// https://opensource.org/licenses/MIT

#include "Texture.hpp"

using namespace Dawn;

void Texture::bind(textureslot_t slot) {
  assertTrue(this->id != -1);
  glActiveTexture(GL_TEXTURE0 + slot);
  glBindTexture(GL_TEXTURE_2D, this->id);
}

int32_t Texture::getWidth() {
  return this->width;
}

int32_t Texture::getHeight() {
  return this->height;
}

void Texture::setSize(int32_t width, int32_t height) {
  if(this->id != -1) glDeleteTextures(1, &this->id);

  this->width = width;
  this->height = height;

  glGenTextures(1, &this->id);
  if(this->id <= 0) throw "Texture generation failed!";
  
  glActiveTexture(GL_TEXTURE0);
  glBindTexture(GL_TEXTURE_2D, this->id);

  // Setup our preferred texture params, later this will be configurable.
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
  // glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  // glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

  // Initialize the texture to blank
  glTexImage2D(
    GL_TEXTURE_2D, 0, GL_RGBA,
    width, height,
    0, GL_RGBA, GL_UNSIGNED_BYTE, NULL
  );
}

void Texture::fill(struct Color color) {
  struct Color *pixels = (struct Color *)memoryAllocate(
    sizeof(struct Color) * this->width * this->height
  );

  this->buffer(pixels);

  memoryFree(pixels);
}

bool_t Texture::isReady() {
  return this->id != -1;
}
      
void Texture::buffer(struct Color pixels[]) {
  glBindTexture(GL_TEXTURE_2D, this->id);

  glTexImage2D(
    GL_TEXTURE_2D, 0, GL_RGBA,
    this->width, this->height,
    0, GL_RGBA, GL_UNSIGNED_BYTE, (void *)pixels
  );
}

Texture::~Texture() {
  if(this->id != -1) glDeleteTextures(1, &this->id);
}