/
binding.cc
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/
binding.cc
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// Copyright 2015 Matthew Bauer <mjbauer95@gmail.com>
#include <nan.h>
#include <node.h>
#include <stdarg.h>
#include <stdio.h>
#include <string>
#include "./libretro.h"
using v8::Isolate;
using v8::Value;
using v8::Local;
using v8::String;
using v8::Function;
using v8::Object;
using v8::Number;
using v8::Handle;
using v8::Integer;
using v8::Boolean;
using v8::ArrayBuffer; // not support in node 0.10!
// core methods, not included in libretro.h?
void (*pretro_init)(void);
void (*pretro_deinit)(void);
unsigned (*pretro_api_version)(void);
void (*pretro_get_system_info)(struct retro_system_info*);
void (*pretro_get_system_av_info)(struct retro_system_av_info*);
void (*pretro_set_environment)(retro_environment_t);
void (*pretro_set_video_refresh)(retro_video_refresh_t);
void (*pretro_set_audio_sample)(retro_audio_sample_t);
void (*pretro_set_audio_sample_batch)(retro_audio_sample_batch_t);
void (*pretro_set_input_poll)(retro_input_poll_t);
void (*pretro_set_input_state)(retro_input_state_t);
void (*pretro_set_controller_port_device)(unsigned, unsigned);
void (*pretro_reset)(void);
void (*pretro_run)(void);
size_t (*pretro_serialize_size)(void);
bool (*pretro_serialize)(void*, size_t);
bool (*pretro_unserialize)(const void*, size_t);
void (*pretro_cheat_reset)(void);
void (*pretro_cheat_set)(unsigned, bool, const char*);
bool (*pretro_load_game)(const struct retro_game_info*);
bool (*pretro_load_game_special)(unsigned, const struct retro_game_info*, size_t);
void (*pretro_unload_game)(void);
unsigned (*pretro_get_region)(void);
void *(*pretro_get_memory_data)(unsigned);
size_t (*pretro_get_memory_size)(unsigned);
// Our only reference to Javascript-land in retro calls
NanCallback* listener;
// bytes for video
int bytes_per_pixel = 2;
// Should this be deferred to Javascript?
void Log(enum retro_log_level level, const char* fmt, ...) {
char error[1024];
va_list argptr;
va_start(argptr, fmt);
vsnprintf(error, sizeof(error), fmt, argptr);
va_end(argptr);
Local<Value> args[] = {
NanNew("log"),
NanNew(level),
NanNew(error)
};
listener->Call(3, args);
}
// Most of this will have to be done in C, but use JS callback wherever possible
bool Environment_cb(unsigned cmd, void* data) {
if (cmd == RETRO_ENVIRONMENT_GET_LOG_INTERFACE) {
struct retro_log_callback* cb = reinterpret_cast<struct retro_log_callback*>(data);
cb->log = Log;
return true;
}
Local<Value> value;
switch (cmd) {
case RETRO_ENVIRONMENT_SET_VARIABLES: {
const struct retro_variable* vars = reinterpret_cast<const struct retro_variable*>(data);
Local<Object> settings = NanNew<Object>();
for (const struct retro_variable* var = vars;
var->key && var->value; var++) {
settings->Set(NanNew(var->key), NanNew(var->value));
}
value = settings;
break;
}
case RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL: {
value = NanNew(*reinterpret_cast<const unsigned*>(data));
break;
}
case RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME: {
value = NanNew(*reinterpret_cast<const bool*>(data));
break;
}
case RETRO_ENVIRONMENT_SET_PIXEL_FORMAT: {
enum retro_pixel_format pix_fmt = *reinterpret_cast<const enum retro_pixel_format*>(data);
value = NanNew(pix_fmt);
break;
}
case RETRO_ENVIRONMENT_GET_VARIABLE: {
struct retro_variable* var = reinterpret_cast<struct retro_variable*>(data);
value = NanNew(var->key);
break;
}
case RETRO_ENVIRONMENT_GET_OVERSCAN:
case RETRO_ENVIRONMENT_GET_CAN_DUPE:
case RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE:
case RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY:
case RETRO_ENVIRONMENT_GET_SAVE_DIRECTORY:
case RETRO_ENVIRONMENT_GET_USERNAME:
case RETRO_ENVIRONMENT_GET_CORE_ASSETS_DIRECTORY:
value = NanNull();
break;
default: {
value = NanNull();
}
}
Local<Value> args[] = {
NanNew("environment"),
NanNew(cmd),
value
};
Handle<Value> out = listener->Call(3, args);
switch (cmd) {
case RETRO_ENVIRONMENT_GET_OVERSCAN:
case RETRO_ENVIRONMENT_GET_CAN_DUPE:
case RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE: {
*reinterpret_cast<bool*>(data) = out->BooleanValue();
return out->BooleanValue();
}
case RETRO_ENVIRONMENT_GET_VARIABLE: {
struct retro_variable *v = reinterpret_cast<struct retro_variable*>(data);
String::Utf8Value str(out->ToString());
v->value = *str;
break;
}
case RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY:
case RETRO_ENVIRONMENT_GET_SAVE_DIRECTORY:
case RETRO_ENVIRONMENT_GET_USERNAME:
case RETRO_ENVIRONMENT_GET_CORE_ASSETS_DIRECTORY: {
String::Utf8Value str(out->ToString());
*reinterpret_cast<const char**>(data) = *str;
break;
}
case RETRO_ENVIRONMENT_GET_LANGUAGE: {
*reinterpret_cast<unsigned*>(data) = out->Uint32Value();
break;
}
}
return true;
}
void VideoRefresh(const void* data, unsigned w, unsigned h, size_t pitch) {
char* buffer = reinterpret_cast<char*>(malloc(h * w * bytes_per_pixel));
for (unsigned line = 0; line < h; line++) {
memcpy(buffer + line * w * bytes_per_pixel, reinterpret_cast<const char*>(data) + line * pitch, w * bytes_per_pixel);
}
Local<Value> args[] = {
NanNew("videorefresh"),
ArrayBuffer::New(Isolate::GetCurrent(), buffer, h * w * bytes_per_pixel),
NanNew(w),
NanNew(h)
};
listener->Call(4, args);
}
void AudioSample(int16_t left, int16_t right) {
Local<Value> args[] = {
NanNew("audiosample"),
NanNew(left),
NanNew(right)
};
listener->Call(3, args);
}
size_t AudioSampleBatch(const int16_t* data, size_t frames) {
float* left = reinterpret_cast<float*>(malloc(frames * 4));
float* right = reinterpret_cast<float*>(malloc(frames * 4));
for (size_t frame = 0; frame < frames; frame++) {
left[frame] = static_cast<float>(data[frame * 2]) / 0x8000;
right[frame] = static_cast<float>(data[frame * 2 + 1]) / 0x8000;
}
Local<Value> args[] = {
NanNew("audiosamplebatch"),
ArrayBuffer::New(Isolate::GetCurrent(), left, frames * 4),
ArrayBuffer::New(Isolate::GetCurrent(), right, frames * 4),
NanNew<Number>(frames)
};
return listener->Call(4, args)->Uint32Value();
}
void InputPoll() {
Local<Value> args[] = {
NanNew("inputpoll")
};
listener->Call(1, args);
}
int16_t InputState(unsigned port, unsigned device, unsigned idx, unsigned id) {
Local<Value> args[] = {
NanNew("inputstate"),
NanNew(port),
NanNew(device),
NanNew(idx),
NanNew(id)
};
return listener->Call(5, args)->Uint32Value();
}
NAN_METHOD(Listen) {
NanScope();
listener = new NanCallback(Local<Function>::Cast(args[0]));
NanReturnUndefined();
}
#define SYM(sym) if (uv_dlsym(libretro, #sym, reinterpret_cast<void**>(&p##sym))) { \
return NanThrowError("retro.LoadCore: Could not link " #sym "."); \
}
NAN_METHOD(LoadCore) {
NanScope();
NanUtf8String path(args[0]);
uv_lib_t* libretro = reinterpret_cast<uv_lib_t*>(malloc(sizeof(uv_lib_t)));
if (uv_dlopen(*path, libretro)) {
return NanThrowError("retro.LoadCore: Shared library not found.");
}
SYM(retro_init);
SYM(retro_deinit);
SYM(retro_set_environment);
SYM(retro_set_video_refresh);
SYM(retro_set_audio_sample);
SYM(retro_set_audio_sample_batch);
SYM(retro_set_input_poll);
SYM(retro_set_input_state);
SYM(retro_set_controller_port_device);
SYM(retro_reset);
SYM(retro_run);
SYM(retro_load_game);
SYM(retro_unload_game);
SYM(retro_api_version);
SYM(retro_get_system_info);
SYM(retro_get_system_av_info);
SYM(retro_get_region);
SYM(retro_serialize_size);
SYM(retro_serialize);
SYM(retro_unserialize);
SYM(retro_cheat_reset); // UNIMPLEMENTED
SYM(retro_cheat_set); // UNIMPLEMENTED
SYM(retro_load_game_special); // UNIMPLEMENTED
SYM(retro_get_memory_data); // UNIMPLEMENTED
SYM(retro_get_memory_size); // UNIMPLEMENTED
pretro_set_environment(Environment_cb);
pretro_init();
pretro_set_video_refresh(VideoRefresh);
pretro_set_audio_sample(AudioSample);
pretro_set_audio_sample_batch(AudioSampleBatch);
pretro_set_input_poll(InputPoll);
pretro_set_input_state(InputState);
NanReturnUndefined();
}
NAN_METHOD(Run) {
NanScope();
pretro_run();
NanReturnUndefined();
}
uv_timer_t timer;
void run(uv_timer_t* handle) {
pretro_run();
}
void start_async(uv_work_t* request) {
uv_timer_init(uv_default_loop(), &timer);
uv_timer_start(&timer, &run, 0, *reinterpret_cast<uint32_t*>(request->data));
}
NAN_METHOD(Start) {
NanScope();
uint32_t* interval = reinterpret_cast<uint32_t*>(malloc(4));
*interval = args[0]->Uint32Value();
uv_work_t* request = reinterpret_cast<uv_work_t*>(malloc(sizeof(uv_work_t)));
request->data = interval;
uv_queue_work(uv_default_loop(), request, &start_async, NULL);
NanReturnUndefined();
}
NAN_METHOD(Stop) {
NanScope();
uv_timer_stop(&timer);
NanReturnUndefined();
}
NAN_METHOD(Reset) {
NanScope();
pretro_reset();
NanReturnUndefined();
}
NAN_METHOD(APIVersion) {
NanScope();
NanReturnValue(NanNew(pretro_api_version()));
}
NAN_METHOD(GetRegion) {
NanScope();
NanReturnValue(NanNew(pretro_get_region()));
}
#define SET(obj, i, attr) obj->Set(NanNew(#attr), NanNew(i.attr));
NAN_METHOD(GetSystemInfo) {
NanScope();
struct retro_system_info info;
pretro_get_system_info(&info);
Local<Object> object = NanNew<Object>();
SET(object, info, library_name);
SET(object, info, library_version);
SET(object, info, valid_extensions);
SET(object, info, need_fullpath);
SET(object, info, block_extract);
NanReturnValue(object);
}
NAN_METHOD(GetSystemAVInfo) {
NanScope();
struct retro_system_av_info info;
pretro_get_system_av_info(&info);
Local<Object> object = NanNew<Object>();
Local<Object> timing = NanNew<Object>();
SET(timing, info.timing, fps);
SET(timing, info.timing, sample_rate);
object->Set(NanNew("timing"), timing);
Local<Object> geometry = NanNew<Object>();
SET(geometry, info.geometry, base_width);
SET(geometry, info.geometry, base_height);
SET(geometry, info.geometry, max_width);
SET(geometry, info.geometry, max_height);
SET(geometry, info.geometry, aspect_ratio);
object->Set(NanNew("geometry"), geometry);
NanReturnValue(object);
}
NAN_METHOD(LoadGamePath) {
NanScope();
NanUtf8String path(args[0]);
struct retro_game_info game;
game.path = *path;
FILE *fp = fopen(game.path, "r");
fseek(fp, 0L, SEEK_END);
game.size = ftell(fp);
fseek(fp, 0L, SEEK_SET);
void *buffer = malloc(game.size);
fread(buffer, 1, game.size, fp);
game.data = buffer;
fclose(fp);
pretro_load_game(&game);
NanReturnUndefined();
}
NAN_METHOD(LoadGame) {
NanScope();
struct retro_game_info game;
Local<Object> bufferObj = args[0]->ToObject();
// TODO: use typed arrays
game.size = node::Buffer::Length(bufferObj);
game.data = node::Buffer::Data(bufferObj);
pretro_load_game(&game);
NanReturnUndefined();
}
NAN_METHOD(UnloadGame) {
NanScope();
pretro_unload_game();
NanReturnUndefined();
}
NAN_METHOD(UnloadCore) {
NanScope();
pretro_deinit();
NanReturnUndefined();
}
NAN_METHOD(Serialize) {
NanScope();
size_t size = pretro_serialize_size();
void* memory = malloc(size);
if (pretro_serialize(memory, size)) {
// TODO: use typed arrays
NanReturnValue(NanNewBufferHandle(reinterpret_cast<char*>(memory), size));
}
}
NAN_METHOD(Unserialize) {
NanScope();
// TODO: use typed arrays
Local<Object> buffer = args[0]->ToObject();
void* data = reinterpret_cast<void*>(node::Buffer::Data(buffer));
NanReturnValue(NanNew(pretro_unserialize(data, node::Buffer::Length(buffer))));
}
void InitAll(Handle<Object> exports) {
NODE_SET_METHOD(exports, "loadCore", LoadCore);
NODE_SET_METHOD(exports, "loadGame", LoadGame);
NODE_SET_METHOD(exports, "loadGamePath", LoadGamePath);
NODE_SET_METHOD(exports, "unloadGame", UnloadGame);
NODE_SET_METHOD(exports, "getSystemInfo", GetSystemInfo);
NODE_SET_METHOD(exports, "getSystemAVInfo", GetSystemAVInfo);
NODE_SET_METHOD(exports, "unserialize", Unserialize);
NODE_SET_METHOD(exports, "serialize", Serialize);
NODE_SET_METHOD(exports, "api_version", APIVersion);
NODE_SET_METHOD(exports, "getRegion", GetRegion);
NODE_SET_METHOD(exports, "reset", Reset);
NODE_SET_METHOD(exports, "listen", Listen);
NODE_SET_METHOD(exports, "run", Run);
NODE_SET_METHOD(exports, "start", Start);
NODE_SET_METHOD(exports, "stop", Stop);
NODE_SET_METHOD(exports, "unloadCore", UnloadCore);
}
NODE_MODULE(addon, InitAll)