2D Camera Works. Working on 3D Camera.

OpenGLEngine/Camera.h

@@ -6,21 +6,18 @@
 
 using namespace glm;
 
-class Camera : public Poseable
+class Camera
 {
 public:
-	Camera(
-		const vec3& position,
-		const vec3& forward = vec3(0.0f, 0.0f, 1.0f),
-		const vec3& up = vec3(0.0f, 1.0f, 0.0f),
-		const vec3& right = vec3(1.0f, 0.0f, 0.0f)
-	) : Poseable(position, forward, up, right), m_projection_matrix(1.0f)
-	{}
+	Camera() : m_view_matrix(1.0f), m_projection_matrix(1.0f) {}
 
-	mat4x4 get_world_to_view_matrix() const { return m_projection_matrix * m_orientation_matrix; }
+	mat4x4 get_world_to_view_matrix() const { return m_projection_matrix * m_view_matrix; }
+
+	const mat4x4& get_view_matrix() const { return m_view_matrix; }
 
 	const mat4x4& get_projection_matrix() const { return m_projection_matrix; }
 
 protected:
+	mat4x4 m_view_matrix;
 	mat4x4 m_projection_matrix;
 };

OpenGLEngine/Camera2D.cpp

@@ -6,7 +6,6 @@ Camera2D::Camera2D(const vec2& size, const vec2& position)
 	: Camera2D(vec3(size.x, size.y, 2.0f), vec3(position.x, position.y, 0.0f)) {}
 
 Camera2D::Camera2D(const vec3& size, const vec3& position)
-	: Camera(position)
 {
 	update_size(size);
 	update_position(position);
@@ -21,18 +20,23 @@ void Camera2D::update_size(const vec3& size)
 void Camera2D::update_position(const vec3& position)
 {
 	m_position = position;
-	Poseable::update_position(-position);
 }
 
-void Camera2D::translate(const vec2& position)
+void Camera2D::translate(const vec2& translation)
 {
-	translate(vec3(position.x, position.y, 0.0f));
+	translate(vec3(translation.x, translation.y, 0.0f));
 }
 
-void Camera2D::translate(const vec3& position)
+void Camera2D::translate(const vec3& translation)
 {
-	m_position += position;
-	Poseable::translate(-position);
+	m_position += translation;
+}
+
+void Camera2D::prerender()
+{
+	m_view_matrix[3][0] = -m_position.x;
+	m_view_matrix[3][1] = -m_position.y;
+	m_view_matrix[3][2] = -m_position.z;
 }
 
 void Camera2D::update_scale()

OpenGLEngine/Camera2D.h

@@ -18,6 +18,8 @@ public:
 	void translate(const vec2& translation);
 	void translate(const vec3& translation);
 
+	void prerender();
+
 	const vec3& get_size() const { return m_size; }
 	const vec3& get_position() const { return m_position; }
 

OpenGLEngine/Camera3D.cpp

@@ -12,9 +12,10 @@ Camera3D::Camera3D(
 	const vec3& up,
 	const vec3& right
 )
-	: Camera(position, forward, up, right)
 {
 	update_frustum(fov_y, aspect_ratio, znear, zfar);
+	update_position(position);
+	update_orientation(forward, up, right);
 }
 
 void Camera3D::update_frustum(float fov_y, float aspect_ratio, float znear, float zfar)
@@ -22,8 +23,60 @@ void Camera3D::update_frustum(float fov_y, float aspect_ratio, float znear, floa
 	m_projection_matrix = glm::perspective(fov_y, aspect_ratio, znear, zfar);
 }
 
+void Camera3D::update_position(const vec3& position)
+{
+	m_position = position;
+}
+
+void Camera3D::update_orientation(const vec3& forward, const vec3& up, const vec3& right)
+{
+	vec3 real_forward;
+	vec3 real_up;
+	vec3 real_right;
+
+	if (right == vec3(0.0f))
+		real_right = glm::normalize(glm::cross(forward, up));
+	else
+		real_right = right;
+
+	real_forward = glm::normalize(forward);
+	real_up = glm::cross(real_right, real_forward);
+
+	m_forward = vec4(real_forward, 0.0f);
+	m_up = vec4(real_up, 0.0f);
+	m_right = vec4(real_right, 0.0f);
+}
+
+void Camera3D::direct_update_orientation(const vec3& forward, const vec3& up, const vec3& right)
+{
+	m_forward = vec4(forward, 0.0f);
+	m_up = vec4(up, 0.0f);
+	m_right = vec4(right, 0.0f);
+}
+
 void Camera3D::translate(const vec3& translation)
 {
 	m_position += translation;
-	Poseable::translate(-translation);
+}
+
+void Camera3D::rotate(const vec3& axis, float angle)
+{
+	mat4 rotation = glm::rotate(mat4(1.0f), angle, axis);
+	m_forward = rotation * m_forward;
+	m_up = rotation * m_up;
+	m_right = rotation * m_right;
+}
+
+void Camera3D::prerender()
+{
+	// This works but it is backwards.
+	m_view_matrix = glm::lookAt(m_position, m_position + vec3(m_forward), vec3(m_up));
+	/*
+	m_view_matrix = mat4(
+		vec4(m_right.x, m_up.x, -m_forward.x, 0.0f),
+		vec4(m_right.y, m_up.y, -m_forward.y, 0.0f),
+		vec4(m_right.z, m_up.z, -m_forward.z, 0.0f),
+		vec4(glm::dot(vec3(m_right), -m_position), glm::dot(vec3(m_up), -m_position), glm::dot(vec3(m_forward), -m_position), 1.0f)
+	);
+	*/
 }

OpenGLEngine/Camera3D.h

@@ -9,8 +9,6 @@ using namespace glm;
 class Camera3D : public Camera
 {
 public:
-	// Creates a Camera3D.
-	// Will throw if direction, up, and right are not orthogonal
 	Camera3D(
 		float fov_y,
 		float aspect_ratio,
@@ -19,18 +17,31 @@ public:
 		const vec3& position,
 		const vec3& forward = vec3(0.0f, 0.0f, 1.0f),
 		const vec3& up = vec3(0.0f, 1.0f, 0.0f),
-		const vec3& right = vec3(1.0f, 0.0f, 0.0f)
+		const vec3& right = vec3(0.0f) // Zero for auto-calculated
 	);
 
 	void update_frustum(float fov_y, float aspect_ratio, float znear, float zfar);
+	void update_position(const vec3& position);
+	// Updates the orientation based on three vectors.
+	// If right is equal to zero it is calculated with glm::cross(forward, up).
+	// Then the true up is calculated with glm::cross(right, forward)
+	void update_orientation(const vec3& forward = vec3(0.0f, 0.0f, 1.0f), const vec3& up = vec3(0.0f, 1.0f, 0.0f), const vec3& right = vec3(0.0f));
+	// Directly sets the forward, up, and right values.
+	void direct_update_orientation(const vec3& forward, const vec3& up, const vec3& right);
 
 	void translate(const vec3& translation);
+	void rotate(const vec3& axis, float angle);
+
+	void prerender();
 
 	const vec3& get_position() const { return m_position; }
-	vec3 get_forward() const { return vec3(m_orientation_matrix[2]); }
-	vec3 get_up() const { return vec3(m_orientation_matrix[1]); }
-	vec3 get_right() const { return vec3(m_orientation_matrix[0]); }
+	vec3 get_forward() const { return vec3(m_forward); }
+	vec3 get_up() const { return vec3(m_up); }
+	vec3 get_right() const { return vec3(m_right); }
 
 private:
 	vec3 m_position;
+	vec4 m_forward;
+	vec4 m_up;
+	vec4 m_right;
 };

OpenGLEngine/MySimple2DScene.cpp

@@ -90,6 +90,7 @@ void MySimple2DScene::update(float delta_time, clock_t clock)
 	m_camera.translate(camera_translation * delta_time * 100.0f);
 
 	// TODO: Make a prerender function or move this to render
+	m_camera.prerender();
 	m_batch.prerender();
 }
 

OpenGLEngine/MySimple3DScene.cpp

@@ -92,6 +92,7 @@ void MySimple3DScene::update(float delta_time, clock_t clock)
 	m_camera.translate(camera_translation * delta_time);
 
 	// TODO: Make a prerender function or move this to render
+	m_camera.prerender();
 	m_batch.prerender();
 }
 

OpenGLEngine/MySimpleCubeScene.cpp

@@ -19,7 +19,7 @@ MySimpleCubeScene::MySimpleCubeScene(Application& application)
 		MySimpleShaderProgram::Vertex( 1.0f, -1.0f,  1.0f)
 	), DrawMode::DRAW_TRIANGLES),
 	m_batch(&m_shape, 1),
-	m_camera((float)egm::TAU_1_4, (float)m_screen_size.x / m_screen_size.y, 1.0f, 10.0f, vec3(0.0f, 0.0f, -5.0f))
+	m_camera((float)egm::TAU_1_8, (float)m_screen_size.x / m_screen_size.y, 1.0f, 10.0f, vec3(0.0f, 0.0f, -5.0f))
 {}
 
 MySimpleCubeScene::~MySimpleCubeScene()
@@ -65,6 +65,7 @@ void MySimpleCubeScene::update(float delta_time, clock_t clock)
 		color.a = 1.0f;
 
 		Poseable& pose = m_batch.get_pose(0);
+		pose.rotate(glm::normalize(vec3(1.0f, 1.0f, 0.0f)), (float)egm::TAU_1_2 * delta_time);
 		pose.update_position(vec3(3 * (float)cos(radians), 0.0f, 0.0f));
 	}
 
@@ -80,6 +81,7 @@ void MySimpleCubeScene::update(float delta_time, clock_t clock)
 	m_camera.translate(camera_translation * delta_time);
 
 	// TODO: Make a prerender function or move this to render
+	m_camera.prerender();
 	m_batch.prerender();
 }