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#include <bitset>
#include <iostream>
#include "platform.hpp"
#define SAMPLE_RATE 44100
#define PI 3.14159265358979323846
#define FREQUENCY 440.0
#define TIMEPERIOD 200
Platform::Platform(const char* title, int windowWidth, int windowHeight, int textureWidth, int textureHeight) {
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
std::cerr << "SDL initialization error: " << SDL_GetError() << std::endl;
}
window = SDL_CreateWindow(title, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, windowWidth, windowHeight, SDL_WINDOW_SHOWN);
renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
audioSpec.freq = SAMPLE_RATE;
audioSpec.format = AUDIO_S16SYS;
audioSpec.channels = 1;
audioSpec.samples = 4096;
audioSpec.userdata = this;
beepRequested = false;
audioSpec.callback = AudioCallback;
audioDevice = SDL_OpenAudioDevice(nullptr, 0, &audioSpec, nullptr, 0);
if (audioDevice == 0) {
std::cerr << "Audio device opening error: " << SDL_GetError() << std::endl;
}
SDL_PauseAudioDevice(audioDevice, 0);
}
Platform::~Platform() {
SDL_CloseAudioDevice(audioDevice);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
}
void Platform::Update(const std::bitset<2048>& bitset, int videoScale) {
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderClear(renderer);
for (int y = 0; y < 32; ++y) {
for (int x = 0; x < 64; ++x) {
SDL_Rect pixelRect = {x * videoScale, y * videoScale, videoScale, videoScale};
if (bitset[y * 64 + x]) {
SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
} else {
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
}
SDL_RenderFillRect(renderer, &pixelRect);
}
}
SDL_RenderPresent(renderer);
}
bool Platform::ProcessInput(std::bitset<16>* keys) {
bool quit = false;
SDL_Event event;
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_QUIT:
quit = true;
break;
case SDL_KEYDOWN:
switch (event.key.keysym.sym) {
case SDLK_ESCAPE: quit = true;
case SDLK_x: (*keys)[0x0] = 1; break;
case SDLK_1: (*keys)[0x1] = 1; break;
case SDLK_2: (*keys)[0x2] = 1; break;
case SDLK_3: (*keys)[0x3] = 1; break;
case SDLK_q: (*keys)[0x4] = 1; break;
case SDLK_w: (*keys)[0x5] = 1; break;
case SDLK_e: (*keys)[0x6] = 1; break;
case SDLK_a: (*keys)[0x7] = 1; break;
case SDLK_s: (*keys)[0x8] = 1; break;
case SDLK_d: (*keys)[0x9] = 1; break;
case SDLK_z: (*keys)[0xA] = 1; break;
case SDLK_c: (*keys)[0xB] = 1; break;
case SDLK_4: (*keys)[0xC] = 1; break;
case SDLK_r: (*keys)[0xD] = 1; break;
case SDLK_f: (*keys)[0xE] = 1; break;
case SDLK_v: (*keys)[0xF] = 1; break;
} break;
case SDL_KEYUP:
switch (event.key.keysym.sym) {
case SDLK_x: (*keys)[0x0] = 0; break;
case SDLK_1: (*keys)[0x1] = 0; break;
case SDLK_2: (*keys)[0x2] = 0; break;
case SDLK_3: (*keys)[0x3] = 0; break;
case SDLK_q: (*keys)[0x4] = 0; break;
case SDLK_w: (*keys)[0x5] = 0; break;
case SDLK_e: (*keys)[0x6] = 0; break;
case SDLK_a: (*keys)[0x7] = 0; break;
case SDLK_s: (*keys)[0x8] = 0; break;
case SDLK_d: (*keys)[0x9] = 0; break;
case SDLK_z: (*keys)[0xA] = 0; break;
case SDLK_c: (*keys)[0xB] = 0; break;
case SDLK_4: (*keys)[0xC] = 0; break;
case SDLK_r: (*keys)[0xD] = 0; break;
case SDLK_f: (*keys)[0xE] = 0; break;
case SDLK_v: (*keys)[0xF] = 0; break;
}
}
}
return quit;
}
void Platform::AudioCallback(void* userdata, uint8_t* stream, int len) {
Platform* platform = static_cast<Platform*>(userdata);
if (platform->beepRequested) {
static double time = 0.0;
double freq = 440.0;
int16_t* sample = reinterpret_cast<int16_t*>(stream);
for (int i = 0; i < len / 2; i++) {
int16_t value = static_cast<int16_t>(32767.0 * sin(2.0 * PI * freq * time));
sample[i] = value;
time += 1.0 / SAMPLE_RATE;
}
} else {
memset(stream, 0, len);
}
}
void Platform::StartBeep() { beepRequested = true; }
void Platform::StopBeep(){ beepRequested = false; }
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