Windows, camera and a bit of shader

src/renderer/camera.cpp

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+#include "camera.hpp"
+
+void Camera::UpdateView() {
+	// roll can be removed from here. because is not actually used in FPS camera
+	glm::mat4 matRoll = glm::mat4(1.0f);//identity matrix; 
+	glm::mat4 matPitch = glm::mat4(1.0f);//identity matrix
+	glm::mat4 matYaw = glm::mat4(1.0f);//identity matrix
+
+	// roll, pitch and yaw are used to store our angles in our class
+	matRoll = glm::rotate(matRoll, roll, glm::vec3(0.0f, 0.0f, 1.0f));
+	matPitch = glm::rotate(matPitch, pitch, glm::vec3(1.0f, 0.0f, 0.0f));
+	matYaw = glm::rotate(matYaw, yaw, glm::vec3(0.0f, 1.0f, 0.0f));
+
+	// order matters
+	glm::mat4 rotate = matRoll * matPitch * matYaw;
+
+	glm::mat4 translate = glm::mat4(1.0f);
+	translate = glm::translate(translate, -eyeVector);
+
+	viewMatrix = rotate * translate;
+}
+
+glm::mat4 Camera::GetViewMatrix() {
+	return viewMatrix;
+}
+
+glm::vec3 Camera::GetPos() {
+	return eyeVector;
+}
+
+void Camera::HandleMouse(SDL_Event e) {
+	if (e.type != SDL_MOUSEMOTION)
+		return;
+
+
+	float mouseDX = e.motion.xrel;
+	float mouseDY = e.motion.yrel;
+
+	glm::vec2 mouseDelta{ mouseDX, mouseDY };
+
+	MouseMoved(mouseDelta);
+}
+
+void Camera::MoveCamera() {
+	float dx = 0;
+	float dz = 0;
+
+	const Uint8* state = SDL_GetKeyboardState(NULL);
+
+	if (state[SDL_SCANCODE_W])
+		dz += 2;
+	if (state[SDL_SCANCODE_S])
+		dz += -2;
+	if (state[SDL_SCANCODE_A])
+		dx += -2;
+	if (state[SDL_SCANCODE_D])
+		dx += 2;
+	// if (state[SDL_SCANCODE_Z])
+
+	// if (state[SDL_SCANCODE_LSHIFT])
+
+
+	// get current view matrix
+	glm::mat4 mat = GetViewMatrix();
+	// row major
+	glm::vec3 forward(mat[0][2], mat[1][2], mat[2][2]);
+	glm::vec3 strafe(mat[0][0], mat[1][0], mat[2][0]);
+
+	// forward vector must be negative to look forward. 
+	// read :http://in2gpu.com/2015/05/17/view-matrix/
+	eyeVector += (-dz * forward + dx * strafe) * CameraSpeed;
+
+	// update the view matrix
+	UpdateView();
+}
+
+void Camera::MouseMoved(glm::vec2 mouseDelta) {
+	// note that yaw and pitch must be converted to radians.
+	// this is done in UpdateView() by glm::rotate
+	yaw += MouseSensitivity * mouseDelta.x;
+	pitch += MouseSensitivity * mouseDelta.y;
+
+	UpdateView();
+}
+