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CLK/OSBindings/SDL/main.cpp

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//
// main.cpp
// Clock Signal
//
// Created by Thomas Harte on 04/11/2017.
// Copyright 2017 Thomas Harte. All rights reserved.
//
#include <algorithm>
#include <array>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <memory>
#include <sys/stat.h>
#include <unistd.h>
#include <SDL2/SDL.h>
#include "../../Analyser/Static/StaticAnalyser.hpp"
#include "../../Machines/Utility/MachineForTarget.hpp"
#include "../../Machines/MediaTarget.hpp"
#include "../../Machines/CRTMachine.hpp"
#include "../../Concurrency/BestEffortUpdater.hpp"
#include "../../Activity/Observer.hpp"
#include "../../Outputs/CRT/Internals/Rectangle.hpp"
namespace {
struct BestEffortUpdaterDelegate: public Concurrency::BestEffortUpdater::Delegate {
void update(Concurrency::BestEffortUpdater *updater, Time::Seconds duration, bool did_skip_previous_update) override {
machine->crt_machine()->run_for(duration);
}
Machine::DynamicMachine *machine;
};
struct SpeakerDelegate: public Outputs::Speaker::Speaker::Delegate {
// This is set to a relatively large number for now.
static const int buffer_size = 1024;
void speaker_did_complete_samples(Outputs::Speaker::Speaker *speaker, const std::vector<int16_t> &buffer) override {
std::lock_guard<std::mutex> lock_guard(audio_buffer_mutex_);
if(audio_buffer_.size() > buffer_size) {
audio_buffer_.erase(audio_buffer_.begin(), audio_buffer_.end() - buffer_size);
}
audio_buffer_.insert(audio_buffer_.end(), buffer.begin(), buffer.end());
}
void audio_callback(Uint8 *stream, int len) {
updater->update();
std::lock_guard<std::mutex> lock_guard(audio_buffer_mutex_);
std::size_t sample_length = static_cast<std::size_t>(len) / sizeof(int16_t);
std::size_t copy_length = std::min(sample_length, audio_buffer_.size());
int16_t *target = static_cast<int16_t *>(static_cast<void *>(stream));
std::memcpy(stream, audio_buffer_.data(), copy_length * sizeof(int16_t));
if(copy_length < sample_length) {
std::memset(&target[copy_length], 0, (sample_length - copy_length) * sizeof(int16_t));
}
audio_buffer_.erase(audio_buffer_.begin(), audio_buffer_.begin() + copy_length);
}
static void SDL_audio_callback(void *userdata, Uint8 *stream, int len) {
reinterpret_cast<SpeakerDelegate *>(userdata)->audio_callback(stream, len);
}
SDL_AudioDeviceID audio_device;
Concurrency::BestEffortUpdater *updater;
std::mutex audio_buffer_mutex_;
std::vector<int16_t> audio_buffer_;
};
class ActivityObserver: public Activity::Observer {
public:
ActivityObserver(Activity::Source *source, float aspect_ratio) {
// Get the suorce to supply all LEDs and drives.
source->set_activity_observer(this);
// The objective is to display drives on one side of the screen, other LEDs on the other. Drives
// may or may not have LEDs and this code intends to display only those which do; so a quick
// comparative processing of the two lists is called for.
// Strip the list of drives to only those which have LEDs. Thwy're the ones that'll be displayed.
drives_.resize(std::remove_if(drives_.begin(), drives_.end(), [this](const std::string &string) {
return std::find(leds_.begin(), leds_.end(), string) == leds_.end();
}) - drives_.begin());
// Remove from the list of LEDs any which are drives. Those will be represented separately.
leds_.resize(std::remove_if(leds_.begin(), leds_.end(), [this](const std::string &string) {
return std::find(drives_.begin(), drives_.end(), string) != drives_.end();
}) - leds_.begin());
set_aspect_ratio(aspect_ratio);
}
void set_aspect_ratio(float aspect_ratio) {
lights_.clear();
// Generate a bunch of LEDs for connected drives.
const float height = 0.05f;
const float width = height / aspect_ratio;
const float right_x = 1.0f - 2.0f * width;
float y = 1.0f - 2.0f * height;
for(const auto &drive: drives_) {
// TODO: use std::make_unique as below, if/when formally embracing C++14.
lights_.emplace(std::make_pair(drive, std::unique_ptr<OpenGL::Rectangle>(new OpenGL::Rectangle(right_x, y, width, height))));
y -= height * 2.0f;
}
/*
This would generate LEDs for things other than drives; I'm declining for now
due to the inexpressiveness of just painting a rectangle.
const float left_x = -1.0f + 2.0f * width;
y = 1.0f - 2.0f * height;
for(const auto &led: leds_) {
lights_.emplace(std::make_pair(led, std::make_unique<OpenGL::Rectangle>(left_x, y, width, height)));
y -= height * 2.0f;
}
*/
}
void draw() {
for(const auto &lit_led: lit_leds_) {
if(blinking_leds_.find(lit_led) == blinking_leds_.end() && lights_.find(lit_led) != lights_.end())
lights_[lit_led]->draw(0.0, 0.8, 0.0);
}
blinking_leds_.clear();
}
private:
std::vector<std::string> leds_;
void register_led(const std::string &name) override {
leds_.push_back(name);
}
std::vector<std::string> drives_;
void register_drive(const std::string &name) override {
drives_.push_back(name);
}
void set_led_status(const std::string &name, bool lit) override {
if(lit) lit_leds_.insert(name);
else lit_leds_.erase(name);
}
void announce_drive_event(const std::string &name, DriveEvent event) override {
blinking_leds_.insert(name);
}
std::map<std::string, std::unique_ptr<OpenGL::Rectangle>> lights_;
std::set<std::string> lit_leds_;
std::set<std::string> blinking_leds_;
};
bool KeyboardKeyForSDLScancode(SDL_Keycode scancode, Inputs::Keyboard::Key &key) {
#define BIND(x, y) case SDL_SCANCODE_##x: key = Inputs::Keyboard::Key::y; break;
switch(scancode) {
default: return false;
BIND(F1, F1) BIND(F2, F2) BIND(F3, F3) BIND(F4, F4) BIND(F5, F5) BIND(F6, F6)
BIND(F7, F7) BIND(F8, F8) BIND(F9, F9) BIND(F10, F10) BIND(F11, F11) BIND(F12, F12)
BIND(1, k1) BIND(2, k2) BIND(3, k3) BIND(4, k4) BIND(5, k5)
BIND(6, k6) BIND(7, k7) BIND(8, k8) BIND(9, k9) BIND(0, k0)
BIND(Q, Q) BIND(W, W) BIND(E, E) BIND(R, R) BIND(T, T)
BIND(Y, Y) BIND(U, U) BIND(I, I) BIND(O, O) BIND(P, P)
BIND(A, A) BIND(S, S) BIND(D, D) BIND(F, F) BIND(G, G)
BIND(H, H) BIND(J, J) BIND(K, K) BIND(L, L)
BIND(Z, Z) BIND(X, X) BIND(C, C) BIND(V, V)
BIND(B, B) BIND(N, N) BIND(M, M)
BIND(KP_7, KeyPad7) BIND(KP_8, KeyPad8) BIND(KP_9, KeyPad9)
BIND(KP_4, KeyPad4) BIND(KP_5, KeyPad5) BIND(KP_6, KeyPad6)
BIND(KP_1, KeyPad1) BIND(KP_2, KeyPad2) BIND(KP_3, KeyPad3)
BIND(KP_0, KeyPad0)
BIND(ESCAPE, Escape)
BIND(PRINTSCREEN, PrintScreen) BIND(SCROLLLOCK, ScrollLock) BIND(PAUSE, Pause)
BIND(GRAVE, BackTick) BIND(MINUS, Hyphen) BIND(EQUALS, Equals) BIND(BACKSPACE, BackSpace)
BIND(TAB, Tab)
BIND(LEFTBRACKET, OpenSquareBracket) BIND(RIGHTBRACKET, CloseSquareBracket)
BIND(BACKSLASH, BackSlash)
BIND(CAPSLOCK, CapsLock) BIND(SEMICOLON, Semicolon)
BIND(APOSTROPHE, Quote) BIND(RETURN, Enter)
BIND(LSHIFT, LeftShift) BIND(COMMA, Comma) BIND(PERIOD, FullStop)
BIND(SLASH, ForwardSlash) BIND(RSHIFT, RightShift)
BIND(LCTRL, LeftControl) BIND(LALT, LeftOption) BIND(LGUI, LeftMeta)
BIND(SPACE, Space)
BIND(RCTRL, RightControl) BIND(RALT, RightOption) BIND(RGUI, RightMeta)
BIND(LEFT, Left) BIND(RIGHT, Right) BIND(UP, Up) BIND(DOWN, Down)
BIND(INSERT, Insert) BIND(HOME, Home) BIND(PAGEUP, PageUp)
BIND(DELETE, Delete) BIND(END, End) BIND(PAGEDOWN, PageDown)
BIND(NUMLOCKCLEAR, NumLock) BIND(KP_DIVIDE, KeyPadSlash) BIND(KP_MULTIPLY, KeyPadAsterisk)
BIND(KP_PLUS, KeyPadPlus) BIND(KP_MINUS, KeyPadMinus) BIND(KP_ENTER, KeyPadEnter)
BIND(KP_DECIMAL, KeyPadDecimalPoint)
BIND(KP_EQUALS, KeyPadEquals)
BIND(HELP, Help)
// SDL doesn't seem to have scancodes for hash or keypad delete?
}
#undef BIND
return true;
}
struct ParsedArguments {
std::string file_name;
Configurable::SelectionSet selections;
};
/*! Parses an argc/argv pair to discern program arguments. */
ParsedArguments parse_arguments(int argc, char *argv[]) {
ParsedArguments arguments;
for(int index = 1; index < argc; ++index) {
char *arg = argv[index];
// Accepted format is:
//
// --flag sets a Boolean option to true.
// --flag=value sets the value for a list option.
// name sets the file name to load.
// Anything starting with a dash always makes a selection; otherwise it's a file name.
if(arg[0] == '-') {
while(*arg == '-') arg++;
// Check for an equals sign, to discern a Boolean selection from a list selection.
std::string argument = arg;
std::size_t split_index = argument.find("=");
if(split_index == std::string::npos) {
arguments.selections[argument].reset(new Configurable::BooleanSelection(true));
} else {
std::string name = argument.substr(0, split_index);
std::string value = argument.substr(split_index+1, std::string::npos);
arguments.selections[name].reset(new Configurable::ListSelection(value));
}
} else {
arguments.file_name = arg;
}
}
return arguments;
}
std::string final_path_component(const std::string &path) {
// An empty path has no final component.
if(path.empty()) {
return "";
}
// Find the last slash...
auto final_slash = path.find_last_of("/\\");
// If no slash was found at all, return the whole path.
if(final_slash == std::string::npos) {
return path;
}
// If a slash was found in the final position, remove it and recurse.
if(final_slash == path.size() - 1) {
return final_path_component(path.substr(0, path.size() - 1));
}
// Otherwise return everything from just after the slash to the end of the path.
return path.substr(final_slash+1, path.size() - final_slash - 1);
}
/*!
Executes @c command and returns its STDOUT.
*/
std::string system_get(const char *command) {
std::unique_ptr<FILE, decltype((pclose))> pipe(popen(command, "r"), pclose);
if(!pipe) return "";
std::string result;
while(!feof(pipe.get())) {
std::array<char, 256> buffer;
if(fgets(buffer.data(), buffer.size(), pipe.get()) != nullptr)
result += buffer.data();
}
return result;
}
}
int main(int argc, char *argv[]) {
SDL_Window *window = nullptr;
// Attempt to parse arguments.
ParsedArguments arguments = parse_arguments(argc, argv);
// This may be printed either as
const std::string usage_suffix = " [file] [OPTIONS] [--rompath={path to ROMs}]";
// Print a help message if requested.
if(arguments.selections.find("help") != arguments.selections.end() || arguments.selections.find("h") != arguments.selections.end()) {
std::cout << "Usage: " << final_path_component(argv[0]) << usage_suffix << std::endl;
std::cout << "Use alt+enter to toggle full screen display. Use control+shift+V to paste text." << std::endl;
std::cout << "Required machine type and configuration is determined from the file. Machines with further options:" << std::endl << std::endl;
auto all_options = Machine::AllOptionsByMachineName();
for(const auto &machine_options: all_options) {
std::cout << machine_options.first << ":" << std::endl;
for(const auto &option: machine_options.second) {
std::cout << '\t' << "--" << option->short_name;
Configurable::ListOption *list_option = dynamic_cast<Configurable::ListOption *>(option.get());
if(list_option) {
std::cout << "={";
bool is_first = true;
for(const auto &option: list_option->options) {
if(!is_first) std::cout << '|';
is_first = false;
std::cout << option;
}
std::cout << "}";
}
std::cout << std::endl;
}
std::cout << std::endl;
}
return 0;
}
// Perform a sanity check on arguments.
if(arguments.file_name.empty()) {
std::cerr << "Usage: " << final_path_component(argv[0]) << usage_suffix << std::endl;
std::cerr << "Use --help to learn more about available options." << std::endl;
return -1;
}
// Determine the machine for the supplied file.
Analyser::Static::TargetList targets = Analyser::Static::GetTargets(arguments.file_name);
if(targets.empty()) {
std::cerr << "Cannot open " << arguments.file_name << "; no target machine found" << std::endl;
return -1;
}
Concurrency::BestEffortUpdater updater;
BestEffortUpdaterDelegate best_effort_updater_delegate;
SpeakerDelegate speaker_delegate;
// For vanilla SDL purposes, assume system ROMs can be found in one of:
//
// /usr/local/share/CLK/[system];
// /usr/share/CLK/[system]; or
// [user-supplied path]/[system]
std::vector<std::string> rom_names;
std::string machine_name;
ROMMachine::ROMFetcher rom_fetcher = [&rom_names, &machine_name, &arguments]
(const std::string &machine, const std::vector<std::string> &names) -> std::vector<std::unique_ptr<std::vector<uint8_t>>> {
rom_names.insert(rom_names.end(), names.begin(), names.end());
machine_name = machine;
std::vector<std::string> paths = {
"/usr/local/share/CLK/",
"/usr/share/CLK/"
};
if(arguments.selections.find("rompath") != arguments.selections.end()) {
std::string user_path = arguments.selections["rompath"]->list_selection()->value;
if(user_path.back() != '/') {
paths.push_back(user_path + "/");
} else {
paths.push_back(user_path);
}
}
std::vector<std::unique_ptr<std::vector<uint8_t>>> results;
for(const auto &name: names) {
FILE *file = nullptr;
for(const auto &path: paths) {
std::string local_path = path + machine + "/" + name;
file = std::fopen(local_path.c_str(), "rb");
if(file) break;
}
if(!file) {
results.emplace_back(nullptr);
continue;
}
std::unique_ptr<std::vector<uint8_t>> data(new std::vector<uint8_t>);
std::fseek(file, 0, SEEK_END);
data->resize(std::ftell(file));
std::fseek(file, 0, SEEK_SET);
std::size_t read = fread(data->data(), 1, data->size(), file);
std::fclose(file);
if(read == data->size())
results.emplace_back(std::move(data));
else
results.emplace_back(nullptr);
}
return results;
};
// Create and configure a machine.
::Machine::Error error;
std::unique_ptr<::Machine::DynamicMachine> machine(::Machine::MachineForTargets(targets, rom_fetcher, error));
if(!machine) {
switch(error) {
default: break;
case ::Machine::Error::MissingROM:
std::cerr << "Could not find system ROMs; please install to /usr/local/share/CLK/ or /usr/share/CLK/, or provide a --rompath." << std::endl;
std::cerr << "One or more of the following were needed but not found:" << std::endl;
for(const auto &name: rom_names) {
std::cerr << machine_name << '/' << name << std::endl;
}
break;
}
return -1;
}
best_effort_updater_delegate.machine = machine.get();
speaker_delegate.updater = &updater;
updater.set_delegate(&best_effort_updater_delegate);
// Attempt to set up video and audio.
if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0) {
std::cerr << "SDL could not initialize! SDL_Error: " << SDL_GetError() << std::endl;
return -1;
}
// Ask for no depth buffer, a core profile and vsync-aligned rendering.
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 0);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
SDL_GL_SetSwapInterval(1);
window = SDL_CreateWindow( final_path_component(arguments.file_name).c_str(),
SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
400, 300,
SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
if(!window)
{
std::cerr << "Could not create window" << std::endl;
return -1;
}
SDL_GLContext gl_context = SDL_GL_CreateContext(window);
SDL_GL_MakeCurrent(window, gl_context);
GLint target_framebuffer = 0;
glGetIntegerv(GL_FRAMEBUFFER_BINDING, &target_framebuffer);
// Setup output, assuming a CRT machine for now, and prepare a best-effort updater.
machine->crt_machine()->setup_output(4.0 / 3.0);
machine->crt_machine()->get_crt()->set_output_gamma(2.2f);
machine->crt_machine()->get_crt()->set_target_framebuffer(target_framebuffer);
// For now, lie about audio output intentions.
auto speaker = machine->crt_machine()->get_speaker();
if(speaker) {
// Create an audio pipe.
SDL_AudioSpec desired_audio_spec;
SDL_AudioSpec obtained_audio_spec;
SDL_zero(desired_audio_spec);
desired_audio_spec.freq = 48000; // TODO: how can I get SDL to reveal the output rate of this machine?
desired_audio_spec.format = AUDIO_S16;
desired_audio_spec.channels = 1;
desired_audio_spec.samples = SpeakerDelegate::buffer_size;
desired_audio_spec.callback = SpeakerDelegate::SDL_audio_callback;
desired_audio_spec.userdata = &speaker_delegate;
speaker_delegate.audio_device = SDL_OpenAudioDevice(nullptr, 0, &desired_audio_spec, &obtained_audio_spec, SDL_AUDIO_ALLOW_FREQUENCY_CHANGE);
speaker->set_output_rate(obtained_audio_spec.freq, desired_audio_spec.samples);
speaker->set_delegate(&speaker_delegate);
SDL_PauseAudioDevice(speaker_delegate.audio_device, 0);
}
int window_width, window_height;
SDL_GetWindowSize(window, &window_width, &window_height);
Configurable::Device *const configurable_device = machine->configurable_device();
if(configurable_device) {
// Establish user-friendly options by default.
configurable_device->set_selections(configurable_device->get_user_friendly_selections());
// Consider transcoding any list selections that map to Boolean options.
for(const auto &option: configurable_device->get_options()) {
// Check for a corresponding selection.
auto selection = arguments.selections.find(option->short_name);
if(selection != arguments.selections.end()) {
// Transcode selection if necessary.
if(dynamic_cast<Configurable::BooleanOption *>(option.get())) {
arguments.selections[selection->first] = std::unique_ptr<Configurable::Selection>(selection->second->boolean_selection());
}
if(dynamic_cast<Configurable::ListOption *>(option.get())) {
arguments.selections[selection->first] = std::unique_ptr<Configurable::Selection>(selection->second->list_selection());
}
}
}
// Apply the user's actual selections to override the defaults.
configurable_device->set_selections(arguments.selections);
}
// If this is a joystick machine, check for and open attached joysticks.
/*!
Provides a wrapper for SDL_Joystick pointers that can keep track
of historic hat values.
*/
class SDLJoystick {
public:
SDLJoystick(SDL_Joystick *joystick) : joystick_(joystick) {
hat_values_.resize(SDL_JoystickNumHats(joystick));
}
~SDLJoystick() {
SDL_JoystickClose(joystick_);
}
/// @returns The underlying SDL_Joystick.
SDL_Joystick *get() {
return joystick_;
}
/// @returns A reference to the storage for the previous state of hat @c c.
Uint8 &last_hat_value(int c) {
return hat_values_[c];
}
/// @returns The logic OR of all stored hat states.
Uint8 hat_values() {
Uint8 value = 0;
for(const auto hat_value: hat_values_) {
value |= hat_value;
}
return value;
}
private:
SDL_Joystick *joystick_;
std::vector<Uint8> hat_values_;
};
std::vector<SDLJoystick> joysticks;
JoystickMachine::Machine *const joystick_machine = machine->joystick_machine();
if(joystick_machine) {
SDL_InitSubSystem(SDL_INIT_JOYSTICK);
for(int c = 0; c < SDL_NumJoysticks(); ++c) {
joysticks.emplace_back(SDL_JoystickOpen(c));
}
}
/*
If the machine offers anything for activity observation,
create and register an activity observer.
*/
std::unique_ptr<ActivityObserver> activity_observer;
Activity::Source *const activity_source = machine->activity_source();
if(activity_source) {
activity_observer.reset(new ActivityObserver(activity_source, 4.0f / 3.0f));
}
// Run the main event loop until the OS tells us to quit.
bool should_quit = false;
Uint32 fullscreen_mode = 0;
while(!should_quit) {
// Process all pending events.
SDL_Event event;
while(SDL_PollEvent(&event)) {
switch(event.type) {
case SDL_QUIT: should_quit = true; break;
case SDL_WINDOWEVENT:
switch (event.window.event) {
case SDL_WINDOWEVENT_RESIZED: {
GLint target_framebuffer = 0;
glGetIntegerv(GL_FRAMEBUFFER_BINDING, &target_framebuffer);
machine->crt_machine()->get_crt()->set_target_framebuffer(target_framebuffer);
SDL_GetWindowSize(window, &window_width, &window_height);
if(activity_observer) activity_observer->set_aspect_ratio(static_cast<float>(window_width) / static_cast<float>(window_height));
} break;
default: break;
}
break;
case SDL_DROPFILE: {
Analyser::Static::Media media = Analyser::Static::GetMedia(event.drop.file);
machine->media_target()->insert_media(media);
} break;
case SDL_KEYDOWN:
// Syphon off the key-press if it's control+shift+V (paste).
if(event.key.keysym.sym == SDLK_v && (SDL_GetModState()&KMOD_CTRL) && (SDL_GetModState()&KMOD_SHIFT)) {
KeyboardMachine::Machine *keyboard_machine = machine->keyboard_machine();
if(keyboard_machine) {
keyboard_machine->type_string(SDL_GetClipboardText());
break;
}
}
// Capture ctrl+shift+d as a take-a-screenshot command.
if(event.key.keysym.sym == SDLK_d && (SDL_GetModState()&KMOD_CTRL) && (SDL_GetModState()&KMOD_SHIFT)) {
// Pick a width to capture that will preserve a 4:3 output aspect ratio.
const int proportional_width = (window_height * 4) / 3;
// Grab the screen buffer.
std::vector<uint8_t> pixels(proportional_width * window_height * 4);
glReadPixels((window_width - proportional_width) >> 1, 0, proportional_width, window_height, GL_RGBA, GL_UNSIGNED_BYTE, pixels.data());
// Flip the buffer vertically, because SDL and OpenGL do not agree about
// the basis axes.
std::vector<uint8_t> swap_buffer(proportional_width*4);
for(int y = 0; y < window_height >> 1; ++y) {
memcpy(swap_buffer.data(), &pixels[y*proportional_width*4], swap_buffer.size());
memcpy(&pixels[y*proportional_width*4], &pixels[(window_height - 1 - y)*proportional_width*4], swap_buffer.size());
memcpy(&pixels[(window_height - 1 - y)*proportional_width*4], swap_buffer.data(), swap_buffer.size());
}
// Pick the directory for images. Try `xdg-user-dir PICTURES` first.
std::string target_directory = system_get("xdg-user-dir PICTURES");
// Make sure there are no newlines.
target_directory.erase(std::remove(target_directory.begin(), target_directory.end(), '\n'), target_directory.end());
target_directory.erase(std::remove(target_directory.begin(), target_directory.end(), '\r'), target_directory.end());
// Fall back on the HOME directory if necessary.
if(target_directory.empty()) target_directory = getenv("HOME");
// Find the first available name of the form ~/clk-screenshot-<number>.bmp.
size_t index = 0;
std::string target;
while(true) {
target = target_directory + "/clk-screenshot-" + std::to_string(index) + ".bmp";
struct stat file_stats;
if(stat(target.c_str(), &file_stats))
break;
++index;
}
// Create a suitable SDL surface and save the thing.
const bool is_big_endian = SDL_BYTEORDER == SDL_BIG_ENDIAN;
SDL_Surface *const surface = SDL_CreateRGBSurfaceFrom(
pixels.data(),
proportional_width, window_height,
8*4,
proportional_width*4,
is_big_endian ? 0xff000000 : 0x000000ff,
is_big_endian ? 0x00ff0000 : 0x0000ff00,
is_big_endian ? 0x0000ff00 : 0x00ff0000,
0);
SDL_SaveBMP(surface, target.c_str());
SDL_FreeSurface(surface);
break;
}
// deliberate fallthrough...
case SDL_KEYUP: {
// Syphon off alt+enter (toggle full-screen) upon key up only; this was previously a key down action,
// but the SDL_KEYDOWN announcement was found to be reposted after changing graphics mode on some
// systems so key up is safer.
if(event.type == SDL_KEYUP && event.key.keysym.sym == SDLK_RETURN && (SDL_GetModState()&KMOD_ALT)) {
fullscreen_mode ^= SDL_WINDOW_FULLSCREEN_DESKTOP;
SDL_SetWindowFullscreen(window, fullscreen_mode);
SDL_ShowCursor((fullscreen_mode&SDL_WINDOW_FULLSCREEN_DESKTOP) ? SDL_DISABLE : SDL_ENABLE);
// Announce a potential discontinuity in keyboard input.
auto keyboard_machine = machine->keyboard_machine();
if(keyboard_machine) {
keyboard_machine->get_keyboard().reset_all_keys();
}
break;
}
const bool is_pressed = event.type == SDL_KEYDOWN;
KeyboardMachine::Machine *const keyboard_machine = machine->keyboard_machine();
if(keyboard_machine) {
Inputs::Keyboard::Key key = Inputs::Keyboard::Key::Space;
if(!KeyboardKeyForSDLScancode(event.key.keysym.scancode, key)) break;
char key_value = '\0';
const char *key_name = SDL_GetKeyName(event.key.keysym.sym);
if(key_name[0] >= 0) key_value = key_name[0];
keyboard_machine->get_keyboard().set_key_pressed(key, key_value, is_pressed);
break;
}
JoystickMachine::Machine *const joystick_machine = machine->joystick_machine();
if(joystick_machine) {
std::vector<std::unique_ptr<Inputs::Joystick>> &joysticks = joystick_machine->get_joysticks();
if(!joysticks.empty()) {
switch(event.key.keysym.scancode) {
case SDL_SCANCODE_LEFT: joysticks[0]->set_input(Inputs::Joystick::Input::Left, is_pressed); break;
case SDL_SCANCODE_RIGHT: joysticks[0]->set_input(Inputs::Joystick::Input::Right, is_pressed); break;
case SDL_SCANCODE_UP: joysticks[0]->set_input(Inputs::Joystick::Input::Up, is_pressed); break;
case SDL_SCANCODE_DOWN: joysticks[0]->set_input(Inputs::Joystick::Input::Down, is_pressed); break;
case SDL_SCANCODE_SPACE: joysticks[0]->set_input(Inputs::Joystick::Input::Fire, is_pressed); break;
case SDL_SCANCODE_A: joysticks[0]->set_input(Inputs::Joystick::Input(Inputs::Joystick::Input::Fire, 0), is_pressed); break;
case SDL_SCANCODE_S: joysticks[0]->set_input(Inputs::Joystick::Input(Inputs::Joystick::Input::Fire, 1), is_pressed); break;
default: {
const char *key_name = SDL_GetKeyName(event.key.keysym.sym);
joysticks[0]->set_input(Inputs::Joystick::Input(key_name[0]), is_pressed);
} break;
}
}
}
} break;
default: break;
}
}
// Push new joystick state, if any.
JoystickMachine::Machine *const joystick_machine = machine->joystick_machine();
if(joystick_machine) {
std::vector<std::unique_ptr<Inputs::Joystick>> &machine_joysticks = joystick_machine->get_joysticks();
for(size_t c = 0; c < joysticks.size(); ++c) {
size_t target = c % machine_joysticks.size();
// Post the first two analogue axes presented by the controller as horizontal and vertical inputs,
// unless the user seems to be using a hat.
// SDL will return a value in the range [-32768, 32767], so map from that to [0, 1.0]
if(!joysticks[c].hat_values()) {
const float x_axis = static_cast<float>(SDL_JoystickGetAxis(joysticks[c].get(), 0) + 32768) / 65535.0f;
const float y_axis = static_cast<float>(SDL_JoystickGetAxis(joysticks[c].get(), 1) + 32768) / 65535.0f;
machine_joysticks[target]->set_input(Inputs::Joystick::Input(Inputs::Joystick::Input::Type::Horizontal), x_axis);
machine_joysticks[target]->set_input(Inputs::Joystick::Input(Inputs::Joystick::Input::Type::Vertical), y_axis);
}
// Forward hats as directions; hats always override analogue inputs.
const int number_of_hats = SDL_JoystickNumHats(joysticks[c].get());
for(int hat = 0; hat < number_of_hats; ++hat) {
const Uint8 hat_value = SDL_JoystickGetHat(joysticks[c].get(), hat);
const Uint8 changes = hat_value ^ joysticks[c].last_hat_value(hat);
joysticks[c].last_hat_value(hat) = hat_value;
if(changes & SDL_HAT_UP) {
machine_joysticks[target]->set_input(Inputs::Joystick::Input(Inputs::Joystick::Input::Type::Up), !!(hat_value & SDL_HAT_UP));
}
if(changes & SDL_HAT_DOWN) {
machine_joysticks[target]->set_input(Inputs::Joystick::Input(Inputs::Joystick::Input::Type::Down), !!(hat_value & SDL_HAT_DOWN));
}
if(changes & SDL_HAT_LEFT) {
machine_joysticks[target]->set_input(Inputs::Joystick::Input(Inputs::Joystick::Input::Type::Left), !!(hat_value & SDL_HAT_LEFT));
}
if(changes & SDL_HAT_RIGHT) {
machine_joysticks[target]->set_input(Inputs::Joystick::Input(Inputs::Joystick::Input::Type::Right), !!(hat_value & SDL_HAT_RIGHT));
}
}
// Forward all fire buttons, retaining their original indices.
const int number_of_buttons = SDL_JoystickNumButtons(joysticks[c].get());
for(int button = 0; button < number_of_buttons; ++button) {
machine_joysticks[target]->set_input(
Inputs::Joystick::Input(Inputs::Joystick::Input::Type::Fire, button),
SDL_JoystickGetButton(joysticks[c].get(), button) ? true : false);
}
}
}
// Display a new frame and wait for vsync.
updater.update();
machine->crt_machine()->get_crt()->draw_frame(static_cast<unsigned int>(window_width), static_cast<unsigned int>(window_height), false);
if(activity_observer) activity_observer->draw();
SDL_GL_SwapWindow(window);
}
// Clean up.
joysticks.clear();
SDL_DestroyWindow( window );
SDL_Quit();
return 0;
}
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