From 137d8fa53925da832e0ef1e61b7fbe56f81a00a6 Mon Sep 17 00:00:00 2001
From: Asuro <theasuro@gmail.com>
Date: Wed, 12 Feb 2025 02:01:39 +0100
Subject: [PATCH] more camera movement

---
 src/engine/Shared.h              |  2 ++
 src/engine/Window.cpp            |  3 +++
 src/game/Global.cpp              | 27 ++++++++++++++++++++++++++-
 src/game/Global.h                |  7 ++++++-
 src/game/Setup.cpp               |  2 ++
 src/game/rendering/Rendering.cpp | 21 +++++++++++++++++----
 6 files changed, 56 insertions(+), 6 deletions(-)

diff --git a/src/engine/Shared.h b/src/engine/Shared.h
index ac08a07..70ff357 100644
--- a/src/engine/Shared.h
+++ b/src/engine/Shared.h
@@ -7,6 +7,8 @@ struct SharedWindowData
     int32_t WindowWidth = 1920;
     int32_t WindowHeight = 1080;
     bool HeldScanCodes[512]{0};
+    float MouseDeltaX = 0.0f;
+    float MouseDeltaY = 0.0f;
 };
 
 struct FileChangeNotification
diff --git a/src/engine/Window.cpp b/src/engine/Window.cpp
index d78424a..70202b6 100644
--- a/src/engine/Window.cpp
+++ b/src/engine/Window.cpp
@@ -57,6 +57,9 @@ void EngineWindow::Update(SharedWindowData& shared)
         }
         case SDL_EVENT_MOUSE_MOTION:
         {
+            shared.MouseDeltaX += evt.motion.xrel;
+            shared.MouseDeltaY += evt.motion.yrel;
+            break;
         }
         default:
             break;
diff --git a/src/game/Global.cpp b/src/game/Global.cpp
index 7dd1cb5..271699b 100644
--- a/src/game/Global.cpp
+++ b/src/game/Global.cpp
@@ -9,6 +9,21 @@ namespace
     Game::GameInstance* GameInst = nullptr;
 } // namespace
 
+void Vec2::Normalize()
+{
+    float len = bx::sqrt(X * X + Y * Y);
+    X /= len;
+    Y /= len;
+}
+
+void Vec3::Normalize()
+{
+    float len = bx::sqrt(X * X + Y * Y + Z * Z);
+    X /= len;
+    Y /= len;
+    Z /= len;
+}
+
 Quat Quat::FromEuler(float x, float y, float z)
 {
     x *= bx::kPi / 180.0f;
@@ -47,13 +62,23 @@ void Mat4::CreateTransform(float* out, Vec3 pos, Quat rot, Vec3 scale)
     bx::mtxMul(out, buf, tMat);
 }
 
-void Mat4::Translate(Vec3 offset)
+void Mat4::TranslateLocal(Vec3 offset)
 {
     M[12] += offset.X;
     M[13] += offset.Y;
     M[14] += offset.Z;
 }
 
+void Mat4::Rotate(Vec3 rotation)
+{
+    float rot[16]{0};
+    bx::mtxRotateXYZ(rot, rotation.X, rotation.Y, rotation.Z);
+    float temp[16]{0};
+    bx::mtxMul(temp, M, rot);
+    for (int32_t i = 0; i < 16; ++i)
+        M[i] = temp[i];
+}
+
 Vec3 Mat4::Right()
 {
     return {M[0], M[1], M[2]};
diff --git a/src/game/Global.h b/src/game/Global.h
index 3fe64c7..8f83d58 100644
--- a/src/game/Global.h
+++ b/src/game/Global.h
@@ -20,6 +20,8 @@ struct Vec2
 {
     float X = 0.0f;
     float Y = 0.0f;
+
+    void Normalize();
 };
 
 struct Vec3
@@ -32,6 +34,8 @@ struct Vec3
     {
         return {X, Y, Z};
     };
+
+    void Normalize();
 };
 
 struct Quat
@@ -67,7 +71,8 @@ struct Mat4
     };
 
     static void CreateTransform(float* out, Vec3 pos, Quat rot = {}, Vec3 scale = {1.0f, 1.0f, 1.0f});
-    void Translate(Vec3 offset);
+    void TranslateLocal(Vec3 offset);
+    void Rotate(Vec3 rotation);
     Vec3 Right();
     Vec3 Up();
     Vec3 Forward();
diff --git a/src/game/Setup.cpp b/src/game/Setup.cpp
index 285a0aa..5cf6e24 100644
--- a/src/game/Setup.cpp
+++ b/src/game/Setup.cpp
@@ -57,6 +57,8 @@ namespace Game
         GetInstance().Delta = newNow - GetInstance().Now;
         GetInstance().Now = newNow;
         SetupInstance.Rendering.Update();
+        GetShared().Window.MouseDeltaX = 0.0f;
+        GetShared().Window.MouseDeltaY = 0.0f;
     }
 
     void Shutdown()
diff --git a/src/game/rendering/Rendering.cpp b/src/game/rendering/Rendering.cpp
index d968888..95fb5d6 100644
--- a/src/game/rendering/Rendering.cpp
+++ b/src/game/rendering/Rendering.cpp
@@ -174,18 +174,31 @@ namespace Game
 
         {
             GetInstance().GameLevel.Update();
+
+            float delta = GetInstance().Delta;
+            constexpr float moveSpeed = 10.0f;
+            constexpr float rotSpeed = 1.0f;
+
             float forwardInput =
                 (GetKey(ScanCode::SDL_SCANCODE_W) ? 1.0f : 0.0f) + (GetKey(ScanCode::SDL_SCANCODE_S) ? -1.0f : 0.0f);
             float rightInput =
                 (GetKey(ScanCode::SDL_SCANCODE_D) ? 1.0f : 0.0f) + (GetKey(ScanCode::SDL_SCANCODE_A) ? -1.0f : 0.0f);
-            Vec3 inputVec = {rightInput, 0.0f, forwardInput};
+            Vec2 moveInput = Vec2{rightInput, forwardInput};
+            moveInput.Normalize();
+            Vec3 inputVec = {moveInput.X * delta * moveSpeed, 0.0f, moveInput.Y * delta * moveSpeed};
 
             Vec3 camForward = Cam.Transform.Forward();
             Vec3 camRight = Cam.Transform.Right();
 
-            Cam.Transform.Translate(
-                {camForward.X * forwardInput, camForward.Y * forwardInput, camForward.Z * forwardInput});
-            Cam.Transform.Translate({camRight.X * rightInput, camRight.Y * rightInput, camRight.Z * rightInput});
+            Vec3 rotInput = {shared.Window.MouseDeltaY * delta, shared.Window.MouseDeltaX * delta, 0.0f};
+            Cam.Transform.Rotate({0.0f, rotInput.Y, 0.0f});
+            // TODO: split transform into rot matrix and translation
+
+            // Cam.Transform.Translate(
+            // {camForward.X * forwardInput, camForward.Y * forwardInput, camForward.Z * forwardInput});
+            Cam.Transform.TranslateLocal({0.0f, 0.0f, -forwardInput});
+            Cam.Transform.TranslateLocal({-rightInput, 0.0f, 0.0f});
+            bgfx::dbgTextPrintf(1, 4, 0x0f, "Cam forward: %.2f %.2f %.2f", camForward.X, camForward.Y, camForward.Z);
         }
 
         // Set view and projection matrix for view 0.