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aspng.cpp
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aspng.cpp
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#include <functional>
#include <memory>
#include "aspng.h"
#include "common.h"
#include "device.h"
#include "net.h"
template<typename T>
bool is_subset(std::set<T> set_a, std::set<T> set_b) {
for (auto i = set_a.begin(); i != set_a.end(); i++) {
if (set_b.find(*i) == set_b.end()) {
return false;
}
}
return true;
}
Aspng::Aspng(AspngSurface *surface, std::string &error) {
std::map<Coord, std::shared_ptr<Device>> device_map;
for (int32_t x = 0; x < surface->get_width(); x++) {
for (int32_t y = 0; y < surface->get_height(); y++) {
device_map[Coord(x, y)] = nullptr;
}
}
std::list<std::function<Device *(void)>> registry;
registry.push_back(BackgroundDevice::create);
registry.push_back(BridgeDevice::create);
registry.push_back(ClockDevice::create);
registry.push_back(CopperDevice::create);
registry.push_back(InputDevice::create);
registry.push_back(LEDDevice::create);
registry.push_back(PullDevice::create);
registry.push_back(SinkDevice::create);
registry.push_back(SourceDevice::create);
registry.push_back(SwitchDevice::create);
registry.push_back(TransistorDevice::create);
// Go through all pixels until we find an unassigned pixel ..
for (int32_t y = 0; y < surface->get_height(); y++) {
for (int32_t x = 0; x < surface->get_width(); x++) {
if (device_map[Coord(x, y)] == nullptr) {
// .. and try to parse a device starting from that pixel.
for (auto it1 = registry.begin(); it1 != registry.end(); it1++) {
std::shared_ptr<Device> d((*it1)());
if (d->parse(surface, Coord(x, y))) {
bool d_is_valid = true;
// Lets find all pixels where we have a parse conflict.
std::set<std::shared_ptr<Device>> conflicting_devices;
auto d_combined = d->all_patches_combined();
for (auto it2 = d_combined.begin(); it2 != d_combined.end(); it2++) {
Coord coord = *it2;
if (device_map[coord] != nullptr) {
conflicting_devices.insert(device_map[coord]);
}
}
// If any of the pixels are owned by some other
// devices, then this device needs to contain all the
// other devices' pixels (or vice versa), otherwise
// it's a parsing error by our standards.
if (conflicting_devices.size() > 0) {
for (auto it2 = conflicting_devices.begin(); it2 != conflicting_devices.end(); it2++) {
auto other = *it2;
auto other_combined = other->all_patches_combined();
if (is_subset(d_combined, other_combined)) {
// We won't continue with `d`.
d_is_valid = false;
break;
} else if (is_subset(other_combined, d_combined)) {
// The other parse isn't maximal, remove it.
ASSERT(this->all_devices.erase(other) == 1);
} else {
error = "incompletable parse";
return;
}
}
}
// To complete the parse, the device should claim all
// of its pixels.
if (d_is_valid) {
for (auto it2 = d_combined.begin(); it2 != d_combined.end(); it2++) {
Coord coord = *it2;
device_map[coord] = d;
}
this->all_devices.insert(d);
}
}
}
}
}
}
// After we have passed through the whole image, every pixel should be
// assigned.
for (int32_t x = 0; x < surface->get_width(); x++) {
for (int32_t y = 0; y < surface->get_height(); y++) {
if (device_map[Coord(x, y)] == nullptr) {
error = "incomplete parse";
return;
}
}
}
// Pre-linking: for every pair of directly (not diagonally) touching pixels
// between devices, add Ports (or not).
for (int32_t x = 0; x < surface->get_width(); x++) {
for (int32_t y = 0; y < surface->get_height(); y++) { // TODO .. should be -1 (ditto above)?
Coord coord(x, y);
std::string prelink_fail;
if ((prelink_fail = maybe_add_ports(device_map, coord, 1, 0)) != "") {
error = "prelink fail: " + prelink_fail;
return;
}
if ((prelink_fail = maybe_add_ports(device_map, coord, 0, 1)) != "") {
error = "prelink fail: " + prelink_fail;
return;
}
// Note: I'm only considering right and up so that I'm not adding
// duplicate ports.
}
}
// Link all devices.
for (auto i = this->all_devices.begin(); i != this->all_devices.end(); i++) {
auto device = *i;
if (!device->link()) {
error = "link fail";
return;
}
}
// Sanity check: no Ports remain in the ToBeResolved state.
for (auto i = this->all_devices.begin(); i != this->all_devices.end(); i++) {
auto device = *i;
auto ports = device->all_ports();
for (auto j = ports.begin(); j != ports.end(); j++) {
auto port = *j;
if (!port->is_resolved()) {
error = "unresolved port";
return;
}
this->all_ports.insert(port);
}
}
}
// If neighboring Coords are different devices, then add ports to both devices
// (pointing to the other device).
std::string Aspng::maybe_add_ports(std::map<Coord, std::shared_ptr<Device>> &device_map, Coord d1_coord, int32_t x_off, int32_t y_off) {
auto d1 = device_map[d1_coord];
if (d1 == nullptr)
return "";
Coord d2_coord = Coord(d1_coord.x + x_off, d1_coord.y + y_off);
auto d2 = device_map[d2_coord];
if ((d2 != nullptr) && (d2 != d1)) {
LinkResult d1_link_result, d2_link_result;
PortType d1_port_type, d2_port_type;
std::string error;
auto d1_patch = d1->find_patch_containing(d1_coord);
std::tie(d1_link_result, d1_port_type, error) = d1->prelink(d1_patch, d2);
if (d1_link_result == LinkError) {
return d1->name() + " " + d1_coord + " - " + error;
}
auto d2_patch = d2->find_patch_containing(d2_coord);
std::tie(d2_link_result, d2_port_type, error) = d2->prelink(d2_patch, d1);
if (d2_link_result == LinkError) {
return d2->name() + " " + d2_coord + " - " + error;
}
if ((d1_link_result == CanLink) && (d2_link_result == CanLink)) {
auto port = std::make_shared<Port>(d1, d1_coord, d1_port_type, d2, d2_coord, d2_port_type);
d1->add_port(port);
d2->add_port(port);
}
}
return "";
}
void Aspng::step(void) {
// Call new_step() on all devices. In fact, only ClockDevices care.
for (auto i = this->all_devices.begin(); i != this->all_devices.end(); i++) {
auto device = *i;
device->new_step();
}
// Build Nets for simulation: for each port ..
std::list<std::shared_ptr<Net>> nets;
std::set<std::shared_ptr<Port>> contained_ports;
for (auto i = this->all_ports.begin(); i != this->all_ports.end(); i++) {
// .. if this Port isn't in any Net, then let's start a new Net,
// propagating out from this Port.
auto port = *i;
if (!(contained_ports.find(port) != contained_ports.end())) {
nets.push_back(std::make_shared<Net>(port, contained_ports));
}
}
// Sanity check: every Port should be contained in some Net.
ASSERT(this->all_ports.size() == contained_ports.size());
// For each net, compute the new value.
for (auto i = nets.begin(); i != nets.end(); i++) {
auto net = *i;
net->compute_new_value();
}
// For each net, apply the new value. (These steps are separated so that
// the new value of one net doesn't affect the new value of the other
// nets.)
for (auto i = nets.begin(); i != nets.end(); i++) {
auto net = *i;
net->apply_new_value();
}
}
void Aspng::draw(AspngSurface *surface) {
for (auto i = this->all_devices.begin(); i != this->all_devices.end(); i++) {
auto device = *i;
device->draw(surface);
}
for (auto i = this->all_devices.begin(); i != this->all_devices.end(); i++) {
auto device = *i;
device->draw_debug(surface);
}
}
std::shared_ptr<Device> Aspng::which_device(Coord coord) {
for (auto i = this->all_devices.begin(); i != this->all_devices.end(); i++) {
auto device = *i;
auto all_patches = device->all_patches();
for (auto j = all_patches.begin(); j != all_patches.end(); j++) {
auto patch = *j;
if (patch->find(coord) != patch->end()) {
return device;
}
}
}
return nullptr;
}