int32_t CALLBACK wWinMain(
HINSTANCE window_instance,
HINSTANCE, // hPrevInst is useless
LPWSTR, // not using lpCmdLine
int) // not using nCmdShow
{
LARGE_INTEGER perf_count_freq_result;
QueryPerformanceFrequency(&perf_count_freq_result);
int64_t perf_count_freq = perf_count_freq_result.QuadPart;
win32_load_xinput();
wchar_t *wnd_class_name = L"Handmade Hero Window Class";
WNDCLASSEXW wnd_class = {}; // c++11 aggregate init to zero the struct
wnd_class.cbSize = sizeof(wnd_class);
wnd_class.style = CS_HREDRAW | CS_VREDRAW;
wnd_class.lpfnWndProc = win32_wnd_proc;
wnd_class.hInstance = window_instance;
wnd_class.lpszClassName = wnd_class_name;
ATOM wnd_class_atom = RegisterClassExW(&wnd_class);
if (0 == wnd_class_atom)
{
win32_debug_print_last_error();
HANDMADE_ASSERT(0 != wnd_class_atom);
return 0;
}
HWND hwnd = CreateWindowExW(0, wnd_class_name, L"Handmade Hero",
WS_OVERLAPPEDWINDOW | WS_VISIBLE,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
nullptr, nullptr, window_instance, nullptr);
if (hwnd == nullptr)
{
win32_debug_print_last_error();
HANDMADE_ASSERT(nullptr != hwnd);
return 0;
}
win32_resize_backbuffer(&g_backbuffer, 1280, 720);
// test sound
win32_sound_output sound_output {};
sound_output.running_sample_index = 0;
sound_output.num_sound_ch = 2;
sound_output.samples_per_sec = 48000;
sound_output.sec_to_buffer = 2;
sound_output.latency_sample_count = sound_output.samples_per_sec / 15;
sound_output.bytes_per_sample = sizeof(int16_t) * sound_output.num_sound_ch;
sound_output.sound_buffer_size = sound_output.samples_per_sec *
sound_output.bytes_per_sample * sound_output.sec_to_buffer;
// create buffer for 2 sec
win32_init_direct_sound(hwnd, sound_output.num_sound_ch,
sound_output.samples_per_sec,
sound_output.sound_buffer_size);
int16_t *samples = nullptr;
if (g_sound_buffer)
{
// fill the whole buffer and started playing sound.
win32_clear_sound_buffer(g_sound_buffer);
g_sound_buffer->Play(0, 0, DSBPLAY_LOOPING);
// allocate sound buffer sample
// Guarantee to be allocation granularity (64KB) aligned
// commited to page boundary (4KB), but the rest are wasted space
// memory auto clears to 0
// freed automatically when app terminates
samples = static_cast<int16_t*>(win32_alloc_zeroed(
nullptr, sound_output.sound_buffer_size));
}
// input
const real32 left_thumb_norm_deadzone =
win32_get_xinput_stick_normalized_deadzone(
XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE);
const real32 right_thumb_norm_deadzone =
win32_get_xinput_stick_normalized_deadzone(
XINPUT_GAMEPAD_RIGHT_THUMB_DEADZONE);
game_input input[2] = {};
game_input *new_input = &input[0];
game_input *old_input = &input[1];
// game memory
#if HANDMADE_INTERNAL_BUILD
void *base_memory_ptr = reinterpret_cast<void*>(terabyte(2ULL));
#else
void *base_memory_ptr = nullptr;
#endif
game_memory memory {};
memory.permanent_storage_size = megabyte(64ULL);
memory.transient_storage_size = gigabyte(1ULL);
uint64_t total_size = memory.permanent_storage_size +
memory.transient_storage_size;
// Guarantee to be allocation granularity (64KB) aligned
// commited to page boundary (4KB), but the rest are wasted space
// memory auto clears to 0
// freed automatically when app terminates
memory.permanent_storage = win32_alloc_zeroed(base_memory_ptr, total_size);
memory.transient_storage = static_cast<int8_t*>(memory.permanent_storage) +
memory.permanent_storage_size;
if (g_backbuffer.memory && samples && memory.permanent_storage &&
memory.transient_storage)
{
g_running = true;
uint64_t last_cycle_count = __rdtsc();
LARGE_INTEGER last_perf_counter;
QueryPerformanceCounter(&last_perf_counter);
while (g_running)
{
// We don't really need old input for keyboard as all keyboard
// events are processed by wm msgs. So, just copy the old state.
game_controller_input *kbd_controller =
get_controller(new_input, game_input::kbd_controller_index);
*kbd_controller =
*get_controller(old_input, game_input::kbd_controller_index);
win32_process_wm_msg_synchonously(kbd_controller);
if (!g_running)
{
break;
}
constexpr uint32_t max_controller_count = std::min(
XUSER_MAX_COUNT, game_input::max_controller_count - 1);
for (DWORD controller_index = 0;
controller_index < max_controller_count;
++controller_index)
{
// controller index 0 is reserved for keyboard
DWORD true_controller_index = controller_index + 1;
XINPUT_STATE controller_state {};
game_controller_input *new_controller =
get_controller(new_input, true_controller_index);
// Simply get the state of the controller from XInput.
if (ERROR_SUCCESS == XInputGetState(controller_index,
&controller_state))
{
// Controller is connected
new_controller->is_connected = true;
const game_controller_input *old_controller =
get_controller(old_input, true_controller_index);
// dwPacketNumber indicates if there have been state changes
controller_state.dwPacketNumber;
const XINPUT_GAMEPAD *pad = &controller_state.Gamepad;
// these are what we care about
win32_process_xinput_digital_button(
&new_controller->move_up,
&old_controller->move_up,
pad, XINPUT_GAMEPAD_DPAD_UP);
win32_process_xinput_digital_button(
&new_controller->move_down,
&old_controller->move_down,
pad, XINPUT_GAMEPAD_DPAD_DOWN);
win32_process_xinput_digital_button(
&new_controller->move_left,
&old_controller->move_left,
pad, XINPUT_GAMEPAD_DPAD_LEFT);
win32_process_xinput_digital_button(
&new_controller->move_right,
&old_controller->move_right,
pad, XINPUT_GAMEPAD_DPAD_RIGHT);
win32_process_xinput_digital_button(
&new_controller->action_up,
&old_controller->action_up,
pad, XINPUT_GAMEPAD_Y);
win32_process_xinput_digital_button(
&new_controller->action_down,
&old_controller->action_down,
pad, XINPUT_GAMEPAD_A);
win32_process_xinput_digital_button(
&new_controller->action_left,
&old_controller->action_left,
pad, XINPUT_GAMEPAD_X);
win32_process_xinput_digital_button(
&new_controller->action_right,
&old_controller->action_right,
pad, XINPUT_GAMEPAD_B);
win32_process_xinput_digital_button(
&new_controller->left_shoulder,
&old_controller->left_shoulder,
pad, XINPUT_GAMEPAD_LEFT_SHOULDER);
win32_process_xinput_digital_button(
&new_controller->right_shoulder,
&old_controller->right_shoulder,
pad, XINPUT_GAMEPAD_RIGHT_SHOULDER);
// bool32 start = pad->wButtons & XINPUT_GAMEPAD_START;
// bool32 back = pad->wButtons & XINPUT_GAMEPAD_BACK;
win32_process_xinput_digital_button(
&new_controller->start,
&old_controller->start,
pad, XINPUT_GAMEPAD_START);
win32_process_xinput_digital_button(
&new_controller->back,
&old_controller->back,
pad, XINPUT_GAMEPAD_BACK);
// process stick
new_controller->is_analog = true;
new_controller->left_stick.avg_x =
win32_xinput_thumb_resolve_deadzone_normalize(
pad->sThumbLX,
left_thumb_norm_deadzone);
new_controller->left_stick.avg_y =
win32_xinput_thumb_resolve_deadzone_normalize(
pad->sThumbLY,
left_thumb_norm_deadzone);
new_controller->right_stick.avg_x =
win32_xinput_thumb_resolve_deadzone_normalize(
pad->sThumbRX,
right_thumb_norm_deadzone);
new_controller->right_stick.avg_y =
win32_xinput_thumb_resolve_deadzone_normalize(
pad->sThumbRY,
right_thumb_norm_deadzone);
}
else
{
// Controller is not connected
new_controller->is_connected = false;
}
}
// DirectSound output test
uint32_t byte_to_lock = 0;
uint32_t bytes_to_write = 0;
if (g_sound_buffer)
{
DWORD play_cursor;
DWORD write_cursor;
if (SUCCEEDED(g_sound_buffer->GetCurrentPosition(&play_cursor,
&write_cursor)))
{
// fill the buffer till the play cursor + latency,
// start location is the last location we wrote to
byte_to_lock = (sound_output.running_sample_index *
sound_output.bytes_per_sample)
% sound_output.sound_buffer_size;
// TODO: this may be dangerous! overwriting part of memory
// between play cursor and write cursor
DWORD target_to_cursor = (play_cursor +
sound_output.latency_sample_count
* sound_output.bytes_per_sample)
% sound_output.sound_buffer_size;
if (byte_to_lock > target_to_cursor)
{
bytes_to_write = sound_output.sound_buffer_size -
byte_to_lock + target_to_cursor;
}
else
{
bytes_to_write = target_to_cursor - byte_to_lock;
}
}
}
game_sound_buffer game_sound_buffer {};
if (bytes_to_write > 0)
{
game_sound_buffer.samples = samples;
game_sound_buffer.sample_count = bytes_to_write /
sound_output.bytes_per_sample;
game_sound_buffer.samples_per_sec = sound_output.samples_per_sec;
}
game_offscreen_buffer buffer {};
buffer.width = g_backbuffer.width;
buffer.height = g_backbuffer.height;
buffer.pitch = g_backbuffer.pitch;
buffer.memory = g_backbuffer.memory;
game_update_and_render(&memory, &buffer, &game_sound_buffer, new_input);
if (bytes_to_write > 0)
{
win32_fill_sound_buffer(&sound_output, &game_sound_buffer,
byte_to_lock, bytes_to_write);
}
HDC device_context = GetDC(hwnd);
win32_window_dimension dimension = win32_get_window_dimension(hwnd);
win32_display_offscreen_buffer(&g_backbuffer, device_context,
dimension.width, dimension.height);
ReleaseDC(hwnd, device_context);
// swap game input
game_input *tmp_input = new_input;
new_input = old_input;
old_input = tmp_input;
uint64_t end_cycle_count = __rdtsc();
LARGE_INTEGER end_perf_counter;
QueryPerformanceCounter(&end_perf_counter);
// use signed, as it may go backward
int64_t cycles_elapsed = end_cycle_count - last_cycle_count;
int64_t counter_elapsed = end_perf_counter.QuadPart -
last_perf_counter.QuadPart;
real32 mega_cycles_per_frame = static_cast<real32>(cycles_elapsed) /
1000000.0f;
real32 ms_per_frame = 1000.0f * static_cast<real32>(counter_elapsed)
/ static_cast<real32>(perf_count_freq);
real32 fps = static_cast<real32>(perf_count_freq) /
static_cast<real32>(counter_elapsed);
// char buf[256];
// sprintf_s(buf, sizeof(buf), "%.2f Mc/f, %.2f ms/f, %.2f fps\n",
// mega_cycles_per_frame, ms_per_frame, fps);
// OutputDebugStringA(buf);
last_perf_counter = end_perf_counter;
last_cycle_count = end_cycle_count;
}
}
else
{
// fail to allocate memory, no game.
OutputDebugStringA("Fail to alloc memory to backbuffer, sound buffer, "
"or game memory.\n");
}
// MessageBoxW(nullptr, L"hello world", L"hello", MB_OK | MB_ICONINFORMATION);
return 0;
}
void GONG_CORE_PREFIX(retro_run)(void)
{
int i = 0;
int port = 0;
bool updated = false;
retro_inputs inputs[MAX_PLAYERS] = {{0}};
if (GONG_CORE_PREFIX(environ_cb)(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
check_variables();
GONG_CORE_PREFIX(input_poll_cb)();
for (port = 0; port < MAX_PLAYERS; port++)
{
for (i = 0; i < 16; i++)
{
if (GONG_CORE_PREFIX(input_state_cb)(port, RETRO_DEVICE_JOYPAD, 0, i))
{
inputs[port].realinput |= 1 << i;
}
}
inputs[port].analogYLeft = GONG_CORE_PREFIX(input_state_cb)(port, RETRO_DEVICE_ANALOG, RETRO_DEVICE_INDEX_ANALOG_LEFT, RETRO_DEVICE_ID_ANALOG_Y) / 5000.0f;
inputs[port].analogYRight = GONG_CORE_PREFIX(input_state_cb)(port, RETRO_DEVICE_ANALOG, RETRO_DEVICE_INDEX_ANALOG_RIGHT, RETRO_DEVICE_ID_ANALOG_Y) / 5000.0f;
if (inputs[port].analogYLeft > 0)
inputs[port].realinput |= (1 << RETRO_DEVICE_ID_JOYPAD_DOWN);
else if (inputs[port].analogYRight > 0)
inputs[port].realinput |= (1 << RETRO_DEVICE_ID_JOYPAD_DOWN);
if (inputs[port].analogYLeft < 0)
inputs[port].realinput |= (1 << RETRO_DEVICE_ID_JOYPAD_UP);
else if (inputs[port].analogYRight < 0)
inputs[port].realinput |= (1 << RETRO_DEVICE_ID_JOYPAD_UP);
inputs[port].input = inputs[port].realinput & ~g_state->previnput[port];
inputs[port].not_input = g_state->previnput[port] & ~inputs[port].realinput;
if (is_key_up_or_down(inputs[port].input, inputs[port].not_input, RETRO_DEVICE_ID_JOYPAD_UP))
process_joypad(&g_state->g_input[port].buttons[B_MOVE_UP], inputs[port].realinput & (1 << RETRO_DEVICE_ID_JOYPAD_UP));
else if (is_key_up_or_down(inputs[port].input, inputs[port].not_input, RETRO_DEVICE_ID_JOYPAD_DOWN))
process_joypad(&g_state->g_input[port].buttons[B_MOVE_DOWN], inputs[port].realinput & (1 << RETRO_DEVICE_ID_JOYPAD_DOWN));
else if (is_key_up_or_down(inputs[port].input, inputs[port].not_input, RETRO_DEVICE_ID_JOYPAD_DOWN))
process_joypad(&g_state->g_input[port].buttons[B_MOVE_DOWN], inputs[port].realinput & (1 << RETRO_DEVICE_ID_JOYPAD_DOWN));
if (is_key_up_or_down(inputs[port].input, inputs[port].not_input, RETRO_DEVICE_ID_JOYPAD_A))
process_joypad(&g_state->g_input[port].buttons[B_SPEED_UP], inputs[port].realinput & (1 << RETRO_DEVICE_ID_JOYPAD_A));
else if (is_key_up_or_down(inputs[port].input, inputs[port].not_input, RETRO_DEVICE_ID_JOYPAD_B))
process_joypad(&g_state->g_input[port].buttons[B_SPEED_UP], inputs[port].realinput & (1 << RETRO_DEVICE_ID_JOYPAD_B));
else if (is_key_up_or_down(inputs[port].input, inputs[port].not_input, RETRO_DEVICE_ID_JOYPAD_X))
process_joypad(&g_state->g_input[port].buttons[B_SPEED_UP], inputs[port].realinput & (1 << RETRO_DEVICE_ID_JOYPAD_X));
else if (is_key_up_or_down(inputs[port].input, inputs[port].not_input, RETRO_DEVICE_ID_JOYPAD_Y))
process_joypad(&g_state->g_input[port].buttons[B_SPEED_UP], inputs[port].realinput & (1 << RETRO_DEVICE_ID_JOYPAD_Y));
g_state->previnput[port] = inputs[port].realinput;
}
game_update_and_render(g_state->g_input, &game_buffer);
GONG_CORE_PREFIX(video_cb)(video_buf, WIDTH, HEIGHT, WIDTH * sizeof(uint32_t));
}
int main(int argc, char* argv[])
{
SDL_Window* sdl_window;
SDL_Renderer* sdl_renderer;
SDL_Texture* sdl_screen_texture;
SDL_AudioSpec sdl_audio_spec;
SDL_GameController* sdl_controller;
memory_block_t memory;
memory_block_t sound_samples;
input_state_t keyboard_input, controller_input, user_input;
surface_t offscreen_buffer;
sdl_audio_ring_buffer_t audio_ring_buffer;
int32_t offscreen_buffer_byte_width;
int32_t screen_width, screen_height;
real32_t target_seconds_per_frame;
uint64_t perf_counter_freq;
uint64_t last_counter;
real32_t elapsed_frame_seconds;
screen_width = 640;
screen_height = 480;
/* initialize sdl and create window */
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_GAMECONTROLLER | SDL_INIT_HAPTIC | SDL_INIT_AUDIO) < 0) {
/* TODO(lars): logging */
return (1);
}
sdl_window = SDL_CreateWindow("sdl2-start", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, screen_width, screen_height, SDL_WINDOW_SHOWN);
if (!sdl_window) {
/* TODO(lars): logging */
return (1);
}
global_refresh_rate = sdl_get_refresh_rate(sdl_window);
/* create sdl renderer */
sdl_renderer = SDL_CreateRenderer(sdl_window, -1, SDL_RENDERER_PRESENTVSYNC);
if (!sdl_renderer) {
sdl_renderer = SDL_CreateRenderer(sdl_window, -1, 0);
if (!sdl_renderer) {
/* TODO(lars): logging */
return (1);
}
}
SDL_SetRenderDrawColor(sdl_renderer, 0, 0, 0, 255);
/* create sdl texture */
sdl_screen_texture = SDL_CreateTexture(sdl_renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, screen_width, screen_height);
if (!sdl_screen_texture) {
/* TODO(lars): logging */
return (1);
}
/* allocated needed memory */
memory.size = game_query_needed_memory_size();
memory.base = calloc(memory.size, sizeof(uint8_t));
if (!memory.base) {
/* TODO(lars): logging */
return (1);
}
/* setup input */
memset(&keyboard_input, 0, sizeof(input_state_t));
memset(&controller_input, 0, sizeof(input_state_t));
sdl_controller = NULL;
/* create offscreen_buffer */
offscreen_buffer.width = screen_width;
offscreen_buffer.height = screen_height;
offscreen_buffer.stride = sizeof(uint32_t);
offscreen_buffer.buf = (uint32_t*)calloc(offscreen_buffer.width * offscreen_buffer.height, offscreen_buffer.stride);
if (!offscreen_buffer.buf) {
/* TODO(lars): logging */
return (1);
}
offscreen_buffer_byte_width = offscreen_buffer.width * offscreen_buffer.stride;
/* set target framerate */
target_seconds_per_frame = 1.0f / TARGET_FRAMES_PER_SECOND;
perf_counter_freq = SDL_GetPerformanceFrequency();
/* setup audio */
sdl_audio_spec.freq = 48000; /* 48 kHz */
sdl_audio_spec.format = AUDIO_S16LSB;
sdl_audio_spec.channels = 2;
sdl_audio_spec.samples = 512;
sdl_audio_spec.callback = &sdl_audio_callback;
sdl_audio_spec.userdata = &audio_ring_buffer;
if (SDL_OpenAudio(&sdl_audio_spec, NULL) == 0 && sdl_audio_spec.format == AUDIO_S16LSB) {
int32_t audio_ring_buffer_size;
audio_ring_buffer_size = sdl_audio_spec.freq * sizeof(int16_t) * sdl_audio_spec.channels;
audio_ring_buffer.play_index = 0;
audio_ring_buffer.write_index = 0;
audio_ring_buffer.size = audio_ring_buffer_size;
audio_ring_buffer.data = calloc(audio_ring_buffer_size, sizeof(uint8_t));
if (audio_ring_buffer.data) {
sound_samples.size = 15 * (int32_t)(target_seconds_per_frame * (real32_t)sdl_audio_spec.freq) * sdl_audio_spec.channels * sizeof(int16_t);
sound_samples.base = calloc(sound_samples.size, sizeof(uint8_t));
if (sound_samples.base) {
/* unpause the audio */
SDL_PauseAudio(0);
}
else {
/* TODO(lars): logging */
free(audio_ring_buffer.data);
SDL_CloseAudio();
}
}
else {
/* TODO(lars): logging */
SDL_CloseAudio();
}
}
else {
/* TODO(lars): logging */
SDL_CloseAudio();
}
elapsed_frame_seconds = target_seconds_per_frame;
last_counter = SDL_GetPerformanceCounter();
global_is_running = 1;
while (global_is_running) {
int32_t window_width;
int32_t window_height;
int32_t current_audio_buffer_size;
int32_t audio_bytes_to_write;
SDL_GetWindowSize(sdl_window, &window_width, &window_height);
/* handle user input */
sdl_process_keyboard_input(sdl_window, &keyboard_input);
sdl_process_controller_input(sdl_controller, &controller_input);
user_input = merge_input_state(keyboard_input, controller_input);
/* game update and render */
game_update_and_render(&memory, &user_input, &offscreen_buffer, elapsed_frame_seconds);
/* get game sound samples and fill the audio ring buffer */
audio_bytes_to_write = 0;
SDL_LockAudioDevice(1);
if (audio_ring_buffer.write_index >= audio_ring_buffer.play_index) {
current_audio_buffer_size = (audio_ring_buffer.write_index - audio_ring_buffer.play_index);
}
else {
current_audio_buffer_size = (audio_ring_buffer.size - audio_ring_buffer.play_index) + audio_ring_buffer.write_index;
}
SDL_UnlockAudioDevice(1);
if (current_audio_buffer_size < sound_samples.size) {
audio_bytes_to_write = sound_samples.size - current_audio_buffer_size;
}
game_get_sound_samples(&sound_samples, audio_bytes_to_write / (sizeof(int16_t) * sdl_audio_spec.channels), sdl_audio_spec.freq, sdl_audio_spec.channels);
sdl_fill_audio_ring_buffer(&audio_ring_buffer, &sound_samples, audio_bytes_to_write);
/* upload the offscreen buffer to the SDL_Renderer */
SDL_RenderClear(sdl_renderer);
if (SDL_UpdateTexture(sdl_screen_texture, 0, offscreen_buffer.buf, offscreen_buffer_byte_width) != 0) {
/* TODO(lars): logging */
return (1);
}
SDL_RenderCopyEx(sdl_renderer, sdl_screen_texture, NULL, NULL, 0, NULL, SDL_FLIP_VERTICAL);
/* enforce target game framerate by sleeping */
elapsed_frame_seconds = sdl_get_seconds_elapsed(last_counter, perf_counter_freq);
if (elapsed_frame_seconds < target_seconds_per_frame) {
int32_t ms_to_sleep;
ms_to_sleep = (int32_t)((target_seconds_per_frame - elapsed_frame_seconds) * 1000.0f) - 1;
if (ms_to_sleep > 0) {
SDL_Delay(ms_to_sleep);
}
while (sdl_get_seconds_elapsed(last_counter, perf_counter_freq) < target_seconds_per_frame) {};
}
elapsed_frame_seconds = sdl_get_seconds_elapsed(last_counter, perf_counter_freq);
/* display the frame */
SDL_RenderPresent(sdl_renderer);
last_counter = SDL_GetPerformanceCounter();
}
SDL_CloseAudio();
SDL_GameControllerClose(sdl_controller);
SDL_DestroyWindow(sdl_window);
SDL_Quit();
free(sound_samples.base);
free(audio_ring_buffer.data);
free(offscreen_buffer.buf);
free(memory.base);
return (0);
}