1 files changed, 46 insertions, 0 deletions
diff --git a/gfx/gl/camera.cpp b/gfx/gl/camera.cpp
new file mode 100644
index 0000000..b4a76d0
--- /dev/null
+++ b/gfx/gl/camera.cpp
@@ -0,0 +1,46 @@
+#include "camera.h"
+#include <glm/gtx/transform.hpp>
+
+Camera::Camera(glm::vec3 pos, float fov, float aspect, float zNear, float zFar) :
+	projection {glm::perspective(fov, aspect, zNear, zFar)}, pos {pos}, forward {0.0F, 0.0F, 1.0F}, up {0.0F, 1.0F,
+																											0.0F}
+{
+}
+
+glm::mat4
+Camera::GetViewProjection() const
+{
+	return projection * glm::lookAt(pos, pos + forward, up);
+}
+
+void
+Camera::MoveForward(float amt)
+{
+	pos += forward * amt;
+}
+
+void
+Camera::MoveRight(float amt)
+{
+	pos += glm::cross(up, forward) * amt;
+}
+
+void
+Camera::Pitch(float angle)
+{
+	const auto right = glm::normalize(glm::cross(up, forward));
+
+	forward = glm::vec3(glm::normalize(glm::rotate(angle, right) * glm::vec4(forward, 0.0)));
+	up = glm::normalize(glm::cross(forward, right));
+}
+
+void
+Camera::RotateY(float angle)
+{
+	static constexpr glm::vec3 UP {0.0F, 1.0F, 0.0F};
+
+	const auto rotation = glm::rotate(angle, UP);
+
+	forward = glm::vec3(glm::normalize(rotation * glm::vec4(forward, 0.0)));
+	up = glm::vec3(glm::normalize(rotation * glm::vec4(up, 0.0)));
+}