// Copyright (c) 2023 Dominic Masters
// 
// This software is released under the MIT License.
// https://opensource.org/licenses/MIT

#include "CubeMesh.hpp"

using namespace Dawn;

void Dawn::CubeMesh::buffer(
  const std::shared_ptr<Mesh> mesh,
  const glm::vec3 pos,
  const glm::vec3 size,
  const int32_t verticeStart,
  const int32_t indiceStart
) {
  glm::vec3 positions[CUBE_VERTICE_COUNT] = {
    pos, 
    glm::vec3(pos.x+size.x, pos.y, pos.z),
    glm::vec3(pos.x, pos.y+size.y, pos.z),
    glm::vec3(pos.x+size.x, pos.y+size.y, pos.z),

    glm::vec3(pos.x, pos.y, pos.z+size.z),
    glm::vec3(pos.x+size.x, pos.y, pos.z+size.z),
    glm::vec3(pos.x, pos.y+size.y, pos.z+size.z),
    pos + size
  };

  glm::vec2 coordinates[CUBE_VERTICE_COUNT] = {
    glm::vec2(0, 0),
    glm::vec2(1, 0),
    glm::vec2(0, 1),
    glm::vec2(1, 1),

    glm::vec2(0, 0),
    glm::vec2(1, 0),
    glm::vec2(0, 1),
    glm::vec2(1, 1)
  };

  int32_t indices[CUBE_INDICE_COUNT] = {
    // Back
    verticeStart, verticeStart + 1, verticeStart + 3,
    verticeStart, verticeStart + 2, verticeStart + 3,

    // Right
    verticeStart + 1, verticeStart + 5, verticeStart + 7,
    verticeStart + 1, verticeStart + 3, verticeStart + 7,

    // Left
    verticeStart + 4, verticeStart, verticeStart + 2,
    verticeStart + 4, verticeStart + 6, verticeStart + 2,

    // Front
    verticeStart + 5, verticeStart + 4, verticeStart + 6,
    verticeStart + 5, verticeStart + 7, verticeStart + 6,

    // Top
    verticeStart + 7, verticeStart + 2, verticeStart + 6,
    verticeStart + 7, verticeStart + 3, verticeStart + 2,

    // Bottom
    verticeStart + 1, verticeStart, verticeStart + 4,
    verticeStart + 1, verticeStart + 4, verticeStart + 5
  };
  
  mesh->bufferPositions(verticeStart, positions, CUBE_VERTICE_COUNT);
  mesh->bufferCoordinates(verticeStart, coordinates, CUBE_VERTICE_COUNT);
  mesh->bufferIndices(indiceStart, indices, CUBE_INDICE_COUNT);
}