fix unproject, add tests to project/unproject

test/src/test_main.c

@@ -15,6 +15,9 @@ main(int argc, const char * argv[]) {
     /* camera */
     cmocka_unit_test(test_camera_lookat),
     cmocka_unit_test(test_camera_decomp)
+
+    /* project */
+    cmocka_unit_test(test_project)
   };
 
   return cmocka_run_group_tests(tests, NULL, NULL);

test/src/test_project.c

@@ -0,0 +1,31 @@
+/*
+ * 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"
+
+void
+test_project(void **state) {
+  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);
+
+  glmc_project(pos, mvp, viewport, projected);
+  glmc_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_true(fabsf(pos[0] - unprojected[0]) < 0.01);
+  assert_true(fabsf(pos[1] - unprojected[1]) < 0.01);
+  assert_true(fabsf(pos[2] - unprojected[2]) < 0.01);
+}

test/src/test_tests.h

@@ -16,4 +16,7 @@ test_camera_lookat(void **state);
 void
 test_camera_decomp(void **state);
 
+void
+test_project(void **state);
+
 #endif /* test_tests_h */