camera fixing

include/render/Renderer.h

@@ -15,7 +15,9 @@ struct Camera {
 	Mat4f InvViewMatrix;
 	Mat4f InvProjectionMatrix;
 
-	Vec3f CamPos;
+	Vec3f CamPos {0, 25, 0};
+
+	Vec2f CamLook {};
 
 	Vec3f m_Front {0, -1, 0};
 
@@ -55,13 +57,14 @@ public:
 
 	void SetZoom(float zoom);
 	void SetCamMovement(const Vec2f& mov);
-	void SetCamPos(const Vec3f& newPos);
+	void SetCamLook(const Vec2f& worldPos);
 
 	void SetBackgroundColor(const Vec3f& color) { m_BackgroundColor = color; }
 
 	Vec2f GetCursorWorldPos(const Vec2f& cursorPos, float windowWidth, float windowHeight);
 private:
 	void InitShaders();
+	void SetCamPos(const Vec3f& newPos);
 };
 
 } // namespace render

src/render/Renderer.cpp

@@ -88,12 +88,13 @@ void Renderer::Resize(int width, int height) {
 
 void Renderer::SetZoom(float zoom) {
 	m_Camera.CamPos.y = std::max(1.0f, m_Camera.CamPos.y - zoom);
+	SetCamLook(m_Camera.CamLook);
 }
 
 void Renderer::SetCamMovement(const Vec2f& mov) {
 	m_Camera.m_Pitch -= mov.y / 50.0f;
 	m_Camera.m_Yaw += mov.x / 50.0f;
-	SetCamPos(m_Camera.CamPos);
+	SetCamLook(m_Camera.CamLook);
 }
 
 void Renderer::SetCamPos(const Vec3f& newPos) {
@@ -114,6 +115,22 @@ void Renderer::SetCamPos(const Vec3f& newPos) {
 	m_EntityShader->SetViewMatrix(m_Camera.viewMatrix);
 }
 
+void Renderer::SetCamLook(const Vec2f& worldPos) {
+	m_Camera.CamLook = worldPos;
+
+	Vec3f front = {
+		std::cos(m_Camera.m_Yaw) * std::cos(m_Camera.m_Pitch),
+		std::sin(m_Camera.m_Pitch),
+		std::sin(m_Camera.m_Yaw) * std::cos(m_Camera.m_Pitch)
+	};
+
+	static const float WORLD_HEIGHT = 0;
+
+	float lambda = (m_Camera.CamPos.y - WORLD_HEIGHT) / front.y;
+
+	SetCamPos({lambda * front.x + m_Camera.CamLook.x, m_Camera.CamPos.y, lambda * front.z + m_Camera.CamLook.y});
+}
+
 Vec2f Renderer::GetCursorWorldPos(const Vec2f& cursorPos, float windowWidth, float windowHeight) {
 
 	float relativeX = (cursorPos.x / windowWidth * 2) - 1.0f;

src/render/WorldRenderer.cpp

@@ -160,7 +160,7 @@ void WorldRenderer::Click() {
 
 void WorldRenderer::SetCamPos(float camX, float camY) {
 	m_CamPos = { camX, camY };
-	m_Renderer->SetCamPos({ camX, 25, camY });
+	m_Renderer->SetCamLook({ camX, camY });
 }
 
 void WorldRenderer::DetectClick() {