Method getPos

Source/Input/TouchDispather.cpp:184–217

}

Vec2 NodeTouchHandler::getPos(const Vec3& winPos) {
	Vec3 pos = winPos;
	Size viewSize = SharedView.getSize();

	Matrix invMVP;
	{
		Matrix MVP;
		Matrix::mulMtx(MVP, SharedDirector.getViewProjection(), _target->getWorld());
		bx::mtxInverse(invMVP.m, MVP.m);
	}
	bx::Plane plane(bx::InitNone);
	bx::calcPlane(plane, bx::Vec3{0, 0, 0}, bx::Vec3{1, 0, 0}, bx::Vec3{0, 1, 0});

	Vec3 posTarget{pos.x, pos.y, 1.0f};
	float viewPort[4]{0, 0, viewSize.width, viewSize.height};

	Vec3 origin, target;
	unProject(pos.x, pos.y, pos.z, invMVP, viewPort, origin);
	unProject(posTarget.x, posTarget.y, posTarget.z, invMVP, viewPort, target);

	bx::Vec3 dir = bx::sub(target, origin);
	bx::Vec3 dirNorm = bx::normalize(dir);
	float denom = bx::dot(dirNorm, plane.normal);
	if (std::abs(denom) >= FLT_EPSILON) {
		float nom = bx::dot(origin, plane.normal) + plane.dist;
		float t = -(nom / denom);
		if (t >= 0) {
			bx::Vec3 offset = bx::mul(dirNorm, t);
			bx::Vec3 result = bx::add(origin, offset);
			return Vec2{result.x, result.y};
		}
	}
	return Vec2{-1.0f, -1.0f};
}

Vec2 NodeTouchHandler::getPos(const SDL_Event& event) {
	Vec3 pos{-1.0f, -1.0f, 0.0f};