Physics for voxelman

walk.d

static struct InputState
{
	ivec3 inputs = ivec3(0,0,0);
	int boost = 1;
	bool jump;
}

InputState gatherInputs()
{
	InputState state;
	if(guiPlugin.mouseLocked)
	{
		if(input.isKeyPressed("key.fast")) state.boost = 1;

		if(input.isKeyPressed("key.right")) state.inputs.x = 1;
		else if(input.isKeyPressed("key.left")) state.inputs.x = -1;

		if(input.isKeyPressed("key.forward")) state.inputs.z = 1;
		else if(input.isKeyPressed("key.backward")) state.inputs.z = -1;

		if(input.isKeyPressed("key.up")) {
			state.inputs.y = 1;
			state.jump = true;
		} else if(input.isKeyPressed("key.down")) state.inputs.y = -1;
	}
	return state;
}

// returns position delta
vec3 handleWalk(ref vec3 speed, float dt)
{
	InputState state = gatherInputs();
	vec3 inputAccel = vec3(0,0,0);
	if (onGround)
	{
		uint cameraSpeed = cameraSpeedOpt.get!uint;
		vec3 horInputs = vec3(state.inputs.x, 0, state.inputs.z);
		if (horInputs != vec3(0,0,0))
			horInputs.normalize();
		horInputs *= cameraSpeed;

		vec3 cameraMovement = toCameraCoordinateSystem(horInputs);
		if (dt > 0) {
			inputAccel.x = cameraMovement.x / dt;
			inputAccel.z = cameraMovement.z / dt;
		}

		if (state.jump)
		{
			speed.y = jumpSpeed;
			onGround = false;
		}

		//if (horInputs == vec3(0,0,0))
		//{
			speed.x = 0;
			speed.z = 0;
		//}
	}
	vec3 accel = vec3(0, -gravity, 0) + inputAccel;

	//float speedScalar = speed.length;
	//float airFrictionMult = speedScalar / maxSpeed;
	//vec3 airFriction = - accel * airFrictionMult;

	float speedScalar = speed.y;
	float airFrictionMult = speedScalar / maxSpeed;
	vec3 airFriction = vec3(0, - accel.y * airFrictionMult, 0);

	vec3 groundFriction = vec3(0,0,0);
	if (onGround)
	{
		//groundFriction
	}

	vec3 fullAcceleration = groundFriction + airFriction + accel;
	speed += fullAcceleration * dt;
	vec3 targetDelta = speed * dt;
	return targetDelta;
}