1 files changed, 114 insertions, 0 deletions
diff --git a/src/game/client/entity/camera.cc b/src/game/client/entity/camera.cc
new file mode 100644
index 0000000..3badd9d
--- /dev/null
+++ b/src/game/client/entity/camera.cc
@@ -0,0 +1,114 @@
+#include "client/pch.hh"
+
+#include "client/entity/camera.hh"
+
+#include "core/config/number.hh"
+
+#include "core/io/config_map.hh"
+
+#include "core/math/angles.hh"
+
+#include "shared/entity/head.hh"
+#include "shared/entity/transform.hh"
+#include "shared/entity/velocity.hh"
+
+#include "shared/world/dimension.hh"
+
+#include "client/entity/player_move.hh"
+
+#include "client/gui/settings.hh"
+
+#include "client/const.hh"
+#include "client/globals.hh"
+#include "client/session.hh"
+#include "client/toggles.hh"
+
+config::Float entity::camera::roll_angle(2.0f, 0.0f, 4.0f);
+config::Float entity::camera::vertical_fov(90.0f, 45.0f, 110.0f);
+config::Unsigned entity::camera::view_distance(16U, 4U, 32U);
+
+glm::fvec3 entity::camera::angles;
+glm::fvec3 entity::camera::direction;
+glm::fmat4x4 entity::camera::matrix;
+chunk_pos entity::camera::position_chunk;
+glm::fvec3 entity::camera::position_local;
+
+static void reset_camera(void)
+{
+    entity::camera::angles = glm::fvec3(0.0f, 0.0f, 0.0f);
+    entity::camera::direction = DIR_FORWARD<float>;
+    entity::camera::matrix = glm::identity<glm::fmat4x4>();
+    entity::camera::position_chunk = chunk_pos(0, 0, 0);
+    entity::camera::position_local = glm::fvec3(0.0f, 0.0f, 0.0f);
+}
+
+// Gracefully contributed by PQCraft himself in 2024
+// making PlatinumSrc and Voxelius kind of related to each other
+static glm::fmat4x4 platinumsrc_viewmatrix(const glm::fvec3& position, const glm::fvec3& angles)
+{
+    glm::fvec3 forward, up;
+    math::vectors(angles, &forward, nullptr, &up);
+
+    auto result = glm::identity<glm::fmat4x4>();
+    result[0][0] = forward.y * up.z - forward.z * up.y;
+    result[1][0] = forward.z * up.x - forward.x * up.z;
+    result[2][0] = forward.x * up.y - forward.y * up.x;
+    result[3][0] = -result[0][0] * position.x - result[1][0] * position.y - result[2][0] * position.z;
+    result[0][1] = up.x;
+    result[1][1] = up.y;
+    result[2][1] = up.z;
+    result[3][1] = -up.x * position.x - up.y * position.y - up.z * position.z;
+    result[0][2] = -forward.x;
+    result[1][2] = -forward.y;
+    result[2][2] = -forward.z;
+    result[3][2] = forward.x * position.x + forward.y * position.y + forward.z * position.z;
+    return result;
+}
+
+void entity::camera::init(void)
+{
+    globals::client_config.add_value("camera.roll_angle", entity::camera::roll_angle);
+    globals::client_config.add_value("camera.vertical_fov", entity::camera::vertical_fov);
+    globals::client_config.add_value("camera.view_distance", entity::camera::view_distance);
+
+    settings::add_slider(1, entity::camera::vertical_fov, settings_location::GENERAL, "camera.vertical_fov", true, "%.0f");
+    settings::add_slider(0, entity::camera::view_distance, settings_location::VIDEO, "camera.view_distance", false);
+    settings::add_slider(10, entity::camera::roll_angle, settings_location::VIDEO, "camera.roll_angle", true, "%.01f");
+
+    reset_camera();
+}
+
+void entity::camera::update(void)
+{
+    if(!session::is_ingame()) {
+        reset_camera();
+        return;
+    }
+
+    const auto& head = globals::dimension->entities.get<entity::client::HeadIntr>(globals::player);
+    const auto& transform = globals::dimension->entities.get<entity::client::TransformIntr>(globals::player);
+    const auto& velocity = globals::dimension->entities.get<entity::Velocity>(globals::player);
+
+    entity::camera::angles = transform.angles + head.angles;
+    entity::camera::position_chunk = transform.chunk;
+    entity::camera::position_local = transform.local + head.offset;
+
+    glm::fvec3 right_vector, up_vector;
+    math::vectors(entity::camera::angles, &entity::camera::direction, &right_vector, &up_vector);
+
+    auto client_angles = entity::camera::angles;
+
+    if(!toggles::get(TOGGLE_PM_FLIGHT)) {
+        // Apply the quake-like view rolling
+        client_angles[2] = math::radians(-entity::camera::roll_angle.get_value()
+            * glm::dot(velocity.value / PMOVE_MAX_SPEED_GROUND, right_vector));
+    }
+
+    const auto z_near = 0.01f;
+    const auto z_far = 1.25f * static_cast<float>(CHUNK_SIZE * entity::camera::view_distance.get_value());
+
+    auto proj = glm::perspective(math::radians(entity::camera::vertical_fov.get_value()), globals::aspect, z_near, z_far);
+    auto view = platinumsrc_viewmatrix(entity::camera::position_local, client_angles);
+
+    entity::camera::matrix = proj * view;
+}