updated comment

CMakeLists.txt

@@ -5,7 +5,7 @@ project(omath VERSION 1.0.1 LANGUAGES CXX)
 include(CMakePackageConfigHelpers)
 
 
-option(OMATH_BUILD_TESTS "Build unit tests" ON)
+option(OMATH_BUILD_TESTS "Build unit tests" OFF)
 option(OMATH_THREAT_WARNING_AS_ERROR "Set highest level of warnings and force compiler to treat them as errors" ON)
 option(OMATH_BUILD_AS_SHARED_LIBRARY "Build Omath as .so or .dll" OFF)
 option(OMATH_USE_AVX2 "Omath will use AVX2 to boost performance" ON)

include/omath/engines/iw_engine/Formulas.hpp

@@ -41,7 +41,9 @@ namespace omath::iw_engine
     inline Mat4x4 CalcPerspectiveProjectionMatrix(const float fieldOfView, const float aspectRatio, const float near,
                                                   const float far)
     {
-        const float fovHalfTan = std::tan(angles::DegreesToRadians(fieldOfView) / 2.f) * 0.75f;
+        // NOTE: Need magic number to fix fov calculation, since source inherit Quake proj matrix calculation
+        constexpr auto kMultiplyFactor = 0.75f;
+        const float fovHalfTan = std::tan(angles::DegreesToRadians(fieldOfView) / 2.f) * kMultiplyFactor;
 
         return
         {

include/omath/engines/source_engine/Formulas.hpp

@@ -40,8 +40,7 @@ namespace omath::source_engine
     inline Mat4x4 CalcPerspectiveProjectionMatrix(const float fieldOfView, const float aspectRatio, const float near,
                                                   const float far)
     {
-        // NOTE: Needed tp make thing draw normal, since source is wierd
+        // NOTE: Need magic number to fix fov calculation, since source inherit Quake proj matrix calculation
-        // and use tricky projection matrix formula.
         constexpr auto kMultiplyFactor = 0.75f;
 
         const float fovHalfTan = std::tan(angles::DegreesToRadians(fieldOfView) / 2.f) * kMultiplyFactor;

tests/CMakeLists.txt

@@ -22,6 +22,7 @@ add_executable(unit-tests
         engines/UnitTestOpenGL.cpp
         engines/UnitTestUnityEngine.cpp
         engines/UnitTestSourceEngine.cpp
+        engines/UnitTestIwEngine.cpp
 
 )
 

tests/engines/UnitTestIwEngine.cpp

@@ -1,3 +1,69 @@
 //
 // Created by Vlad on 3/17/2025.
 //
+#include <gtest/gtest.h>
+#include <omath/engines/iw_engine/Camera.hpp>
+#include <omath/engines/iw_engine/Constants.hpp>
+#include <omath/engines/iw_engine/Formulas.hpp>
+
+
+TEST(UnitTestEwEngine, ForwardVector)
+{
+    const auto forward = omath::source_engine::ForwardVector({});
+
+    EXPECT_EQ(forward, omath::source_engine::kAbsForward);
+}
+
+TEST(UnitTestEwEngine, RightVector)
+{
+    const auto right = omath::source_engine::RightVector({});
+
+    EXPECT_EQ(right, omath::source_engine::kAbsRight);
+}
+
+TEST(UnitTestEwEngine, UpVector)
+{
+    const auto up = omath::source_engine::UpVector({});
+    EXPECT_EQ(up, omath::source_engine::kAbsUp);
+}
+
+TEST(UnitTestEwEngine, ProjectTargetMovedFromCamera)
+{
+    constexpr auto fov = omath::projection::FieldOfView::FromDegrees(90.f);
+    const auto cam = omath::source_engine::Camera({0, 0, 0}, {}, {1920.f, 1080.f}, fov, 0.01f, 1000.f);
+
+
+    for (float distance = 0.02f; distance < 1000.f; distance += 0.01f)
+    {
+        const auto projected = cam.WorldToScreen({distance, 0, 0});
+
+        EXPECT_TRUE(projected.has_value());
+
+        if (!projected.has_value())
+            continue;
+
+        EXPECT_NEAR(projected->x, 960, 0.00001f);
+        EXPECT_NEAR(projected->y, 540, 0.00001f);
+    }
+}
+
+TEST(UnitTestEwEngine, CameraSetAndGetFov)
+{
+    constexpr auto fov = omath::projection::FieldOfView::FromDegrees(90.f);
+    auto cam = omath::source_engine::Camera({0, 0, 0}, {}, {1920.f, 1080.f}, fov, 0.01f, 1000.f);
+
+    EXPECT_EQ(cam.GetFieldOfView().AsDegrees(), 90.f);
+    cam.SetFieldOfView(omath::projection::FieldOfView::FromDegrees(50.f));
+
+    EXPECT_EQ(cam.GetFieldOfView().AsDegrees(), 50.f);
+}
+
+TEST(UnitTestEwEngine, CameraSetAndGetOrigin)
+{
+    auto cam = omath::source_engine::Camera({0, 0, 0}, {}, {1920.f, 1080.f}, {}, 0.01f, 1000.f);
+
+    EXPECT_EQ(cam.GetOrigin(), omath::Vector3<float>{});
+    cam.SetFieldOfView(omath::projection::FieldOfView::FromDegrees(50.f));
+
+    EXPECT_EQ(cam.GetFieldOfView().AsDegrees(), 50.f);
+}