/*
 * Copyright (c), Recep Aslantas.
 *
 * MIT License (MIT), http://opensource.org/licenses/MIT
 * Full license can be found in the LICENSE file
 */

#include "test_common.h"

TEST_IMPL(camera_lookat) {
  mat4 view1, view2;
  vec3 center,
       eye = {0.024f, 14.6f, 67.04f},
       dir = {0.0f, 0.0f, -1.0f},
       up  = {0.0f, 1.0f, 0.0f};

  glm_vec3_add(eye, dir, center);
  glm_lookat(eye, center, up, view1);

  glm_look(eye, dir, up, view2);

  ASSERTIFY(test_assert_mat4_eq(view1, view2))

  TEST_SUCCESS
}

TEST_IMPL(camera_decomp) {
  mat4  proj, proj2;
  vec4  sizes;
  float aspect, fovy, nearZ, farZ;

  aspect  = 0.782f;
  fovy    = glm_rad(49.984f);
  nearZ   = 0.1f;
  farZ    = 100.0f;

  glm_perspective(fovy, aspect, nearZ, farZ, proj);
  ASSERT(fabsf(aspect  - glm_persp_aspect(proj)) < GLM_FLT_EPSILON)
  ASSERT(fabsf(fovy    - glm_persp_fovy(proj))   < GLM_FLT_EPSILON)
  ASSERT(fabsf(49.984f - glm_deg(glm_persp_fovy(proj))) < GLM_FLT_EPSILON)

  glm_persp_sizes(proj, fovy, sizes);

  glm_frustum(-sizes[0] * 0.5f,
               sizes[0] * 0.5f,
              -sizes[1] * 0.5f,
               sizes[1] * 0.5f,
               nearZ,
               farZ,
               proj2);

  ASSERTIFY(test_assert_mat4_eq(proj, proj2))

  TEST_SUCCESS
}