add cglm as 3rd-party library

1 files changed, 36 insertions, 0 deletions

diff --git a/libs/cglm/test/src/test_cam_lh_zo.c b/libs/cglm/test/src/test_cam_lh_zo.c
new file mode 100644
index 0000000..f5f50af
--- /dev/null
+++ b/libs/cglm/test/src/test_cam_lh_zo.c
@@ -0,0 +1,36 @@
+/*
+ * 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(perspective_lh_zo) {
+  mat4 dst;
+  const float fovy     = glm_rad(45.0f);
+  const float aspect   = 640/480.0f;
+  const float zNearVal = 0.1f;
+  const float zFarVal  = 100.0f;
+
+  glm_perspective_lh_zo(fovy, aspect, zNearVal, zFarVal, dst);
+
+  /* Sanity mk. I: longhand version */
+  ASSERT(test_eq(dst[0][0],  1.0f / (tanf(fovy / 2) * aspect)))
+  ASSERT(test_eq(dst[1][1],  1.0f / tanf(fovy / 2)))
+  ASSERT(test_eq(dst[2][2],  zFarVal / (zFarVal - zNearVal)))
+  ASSERT(test_eq(dst[2][3],  1.0f))
+  ASSERT(test_eq(dst[3][2], -1 * zFarVal * zNearVal / (zFarVal - zNearVal)))
+
+  /* Sanity mk. II */
+  /* "Reference values" generated by GLM's glm::perspectiveLH_ZO */
+  mat4 cmp = {0};
+  cmp[0][0] =  1.8106601f;
+  cmp[1][1] =  2.4142134f;
+  cmp[2][2] =  1.0010010f;
+  cmp[2][3] =  1.0000000f;
+  cmp[3][2] = -0.1001001f;
+
+  return test_assert_mat4_eq(dst, cmp);
+}