1 files changed, 92 insertions, 0 deletions
diff --git a/libs/cglm/test/src/test_project.h b/libs/cglm/test/src/test_project.h
new file mode 100644
index 0000000..41bdecd
--- /dev/null
+++ b/libs/cglm/test/src/test_project.h
@@ -0,0 +1,92 @@
+/*
+ * 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(GLM_PREFIX, unprojecti) {
+  mat4 model, view, proj, mvp;
+  vec4 viewport = {0.0f, 0.0f, 800.0f, 600.0f};
+  vec3 pos      = {13.0f, 45.0f, 0.74f};
+  vec3 projected, unprojected;
+
+  glm_translate_make(model, (vec3){0.0f, 0.0f, -10.0f});
+  glm_lookat((vec3){0.0f, 0.0f, 0.0f}, pos, GLM_YUP, view);
+
+  glm_perspective_default(0.5f, proj);
+  glm_mat4_mulN((mat4 *[]){&proj, &view, &model}, 3, mvp);
+
+  GLM(project)(pos, mvp, viewport, projected);
+
+  glm_mat4_inv(mvp, mvp);
+  GLM(unprojecti)(projected, mvp, viewport, unprojected);
+
+  /* unprojected of projected vector must be same as original one */
+  /* we used 0.01 because of projection floating point errors */
+  ASSERT(fabsf(pos[0] - unprojected[0]) < 0.01)
+  ASSERT(fabsf(pos[1] - unprojected[1]) < 0.01)
+  ASSERT(fabsf(pos[2] - unprojected[2]) < 0.01)
+
+  TEST_SUCCESS
+}
+
+TEST_IMPL(GLM_PREFIX, unproject) {
+  mat4 model, view, proj, mvp;
+  vec4 viewport = {0.0f, 0.0f, 800.0f, 600.0f};
+  vec3 pos      = {13.0f, 45.0f, 0.74f};
+  vec3 projected, unprojected;
+
+  glm_translate_make(model, (vec3){0.0f, 0.0f, -10.0f});
+  glm_lookat((vec3){0.0f, 0.0f, 0.0f}, pos, GLM_YUP, view);
+
+  glm_perspective_default(0.5f, proj);
+  glm_mat4_mulN((mat4 *[]){&proj, &view, &model}, 3, mvp);
+
+  GLM(project)(pos, mvp, viewport, projected);
+  GLM(unproject)(projected, mvp, viewport, unprojected);
+
+  /* unprojected of projected vector must be same as original one */
+  /* we used 0.01 because of projection floating point errors */
+  ASSERT(fabsf(pos[0] - unprojected[0]) < 0.01)
+  ASSERT(fabsf(pos[1] - unprojected[1]) < 0.01)
+  ASSERT(fabsf(pos[2] - unprojected[2]) < 0.01)
+
+  TEST_SUCCESS
+}
+
+TEST_IMPL(GLM_PREFIX, project) {
+  mat4 model, view, proj, mvp;
+  vec4 viewport = {0.0f, 0.0f, 800.0f, 600.0f};
+  vec3 pos      = {13.0f, 45.0f, 0.74f};
+  vec3 projected, unprojected;
+
+  glm_translate_make(model, (vec3){0.0f, 0.0f, -10.0f});
+  glm_lookat((vec3){0.0f, 0.0f, 0.0f}, pos, GLM_YUP, view);
+
+  glm_perspective_default(0.5f, proj);
+  glm_mat4_mulN((mat4 *[]){&proj, &view, &model}, 3, mvp);
+
+  GLM(project)(pos, mvp, viewport, projected);
+  GLM(unproject)(projected, mvp, viewport, unprojected);
+
+  /* unprojected of projected vector must be same as original one */
+  /* we used 0.01 because of projection floating point errors */
+  ASSERT(fabsf(pos[0] - unprojected[0]) < 0.01)
+  ASSERT(fabsf(pos[1] - unprojected[1]) < 0.01)
+  ASSERT(fabsf(pos[2] - unprojected[2]) < 0.01)
+
+  /* test with no projection */
+  glm_mat4_identity(mvp);
+
+  GLM(project)(pos, mvp, viewport, projected);
+  GLM(unproject)(projected, mvp, viewport, unprojected);
+
+  ASSERT(test_eq(pos[0], unprojected[0]))
+  ASSERT(test_eq(pos[1], unprojected[1]))
+  ASSERT(test_eq(pos[2], unprojected[2]))
+
+  TEST_SUCCESS
+}