added open gl stuff

include/omath/engines/OpenGL/Camera.hpp

@@ -0,0 +1,19 @@
+//
+// Created by Orange on 12/23/2024.
+//
+#pragma once
+#include "Constants.hpp"
+#include "omath/projection/Camera.hpp"
+
+namespace omath::opengl
+{
+    class Camera final : public projection::Camera<Mat4x4, ViewAngles>
+    {
+    public:
+        Camera(const Vector3& position, const ViewAngles& viewAngles, const projection::ViewPort& viewPort,
+               const Angle<float, 0.f, 180.f, AngleFlags::Clamped>& fov, float near, float far);
+        void LookAt(const Vector3& target) override;
+        [[nodiscard]] Mat4x4 CalcViewMatrix() const override;
+        [[nodiscard]] Mat4x4 CalcProjectionMatrix() const override;
+    };
+}

include/omath/engines/OpenGL/Constants.hpp

@@ -0,0 +1,25 @@
+//
+// Created by Orange on 12/23/2024.
+//
+#pragma once
+
+#include <omath/Vector3.hpp>
+#include <omath/Mat.hpp>
+#include <omath/Angle.hpp>
+#include <omath/ViewAngles.hpp>
+
+namespace omath::opengl
+{
+    constexpr Vector3 kAbsUp = {0, 1, 0};
+    constexpr Vector3 kAbsRight = {1, 0, 0};
+    constexpr Vector3 kAbsForward = {0, 0, -1};
+
+    using Mat4x4 = Mat<4, 4, float, MatStoreType::COLUMN_MAJOR>;
+    using Mat3x3 = Mat<4, 4, float, MatStoreType::COLUMN_MAJOR>;
+    using Mat1x3 = Mat<1, 3, float, MatStoreType::COLUMN_MAJOR>;
+    using PitchAngle = Angle<float, 0.f, 180.f, AngleFlags::Clamped>;
+    using YawAngle = Angle<float, 0.f, 360.f, AngleFlags::Normalized>;
+    using RollAngle = Angle<float, 0.f, 360.f, AngleFlags::Normalized>;
+
+    using ViewAngles = omath::ViewAngles<PitchAngle, YawAngle, RollAngle>;
+}

include/omath/engines/OpenGL/Formulas.hpp

@@ -0,0 +1,54 @@
+//
+// Created by Orange on 12/23/2024.
+//
+#pragma once
+#include "Constants.hpp"
+
+
+namespace omath::opengl
+{
+    [[nodiscard]]
+    inline Vector3 ForwardVector(const ViewAngles& angles)
+    {
+        const auto vec = MatRotation(angles) * MatColumnFromVector(kAbsForward);
+
+        return {vec.At(0, 0), vec.At(1, 0), vec.At(2, 0)};
+    }
+
+    [[nodiscard]]
+    inline Vector3 RightVector(const ViewAngles& angles)
+    {
+        const auto vec = MatRotation(angles) * MatColumnFromVector(kAbsRight);
+
+        return {vec.At(0, 0), vec.At(1, 0), vec.At(2, 0)};
+    }
+
+    [[nodiscard]]
+    inline Vector3 UpVector(const ViewAngles& angles)
+    {
+        const auto vec = MatRotation(angles) * MatColumnFromVector(kAbsUp);
+
+        return {vec.At(0, 0), vec.At(1, 0), vec.At(2, 0)};
+    }
+
+    [[nodiscard]] inline Mat4x4 CalcViewMatrix(const ViewAngles& angles, const Vector3& cam_origin)
+    {
+        return MatCameraView<float, MatStoreType::COLUMN_MAJOR>(-ForwardVector(angles), RightVector(angles), UpVector(angles), cam_origin);
+    }
+
+
+    [[nodiscard]]
+    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);
+
+        return {
+                    {1.f / (aspectRatio * fovHalfTan), 0, 0, 0},
+                    {0, 1.f / (fovHalfTan), 0, 0},
+                    {0, 0, -(far + near) / (far - near), -(2.f * far * near) / (far - near)},
+                    {0, 0, -1, 0},
+
+            };
+    }
+}

include/omath/engines/Source/Camera.hpp

@@ -2,7 +2,7 @@
 // Created by Orange on 12/4/2024.
 //
 #pragma once
-#include "Constants.h"
+#include "Constants.hpp"
 #include "omath/projection/Camera.hpp"
 
 namespace omath::source

include/omath/engines/Source/Formulas.hpp

@@ -2,7 +2,7 @@
 // Created by Orange on 12/4/2024.
 //
 #pragma once
-#include "Constants.h"
+#include "Constants.hpp"
 
 namespace omath::source
 {

include/omath/projection/Camera.hpp

@@ -126,7 +126,10 @@ namespace omath::projection
             if (IsNdcOutOfBounds(projected))
                 return std::unexpected(Error::WORLD_POSITION_IS_OUT_OF_SCREEN_BOUNDS);
 
-            return Vector3{(projected.At(0,0)+1) / 2 * m_viewPort.m_width , (-projected.At(1,0)+1) / 2 * m_viewPort.m_height, projected.At(2,0)};
+            const auto screenPositionX = (projected.At(0,0)+1.f) / 2.f * m_viewPort.m_width;
+            const auto screenPositionY = (-projected.At(1,0)+1) / 2.f * m_viewPort.m_height;
+
+            return Vector3{screenPositionX, screenPositionY, projected.At(2,0)};
         }
 
     protected: