ref: 9b7ba9f4a17daa105c46bfb5880547c1da82b407
dir: /src/platform_sdl.c/
#include <SDL2/SDL.h>
#include "platform.h"
#include "input.h"
#include "system.h"
static uint64_t perf_freq = 0;
static bool wants_to_exit = false;
static SDL_Window *window;
static SDL_AudioDeviceID audio_device;
static SDL_GameController *gamepad;
static void (*audio_callback)(float *buffer, uint32_t len) = NULL;
uint8_t platform_sdl_gamepad_map[] = {
[SDL_CONTROLLER_BUTTON_A] = INPUT_GAMEPAD_A,
[SDL_CONTROLLER_BUTTON_B] = INPUT_GAMEPAD_B,
[SDL_CONTROLLER_BUTTON_X] = INPUT_GAMEPAD_X,
[SDL_CONTROLLER_BUTTON_Y] = INPUT_GAMEPAD_Y,
[SDL_CONTROLLER_BUTTON_BACK] = INPUT_GAMEPAD_SELECT,
[SDL_CONTROLLER_BUTTON_GUIDE] = INPUT_INVALID,
[SDL_CONTROLLER_BUTTON_START] = INPUT_GAMEPAD_START,
[SDL_CONTROLLER_BUTTON_LEFTSTICK] = INPUT_GAMEPAD_L_STICK_PRESS,
[SDL_CONTROLLER_BUTTON_RIGHTSTICK] = INPUT_GAMEPAD_R_STICK_PRESS,
[SDL_CONTROLLER_BUTTON_LEFTSHOULDER] = INPUT_GAMEPAD_L_SHOULDER,
[SDL_CONTROLLER_BUTTON_RIGHTSHOULDER] = INPUT_GAMEPAD_R_SHOULDER,
[SDL_CONTROLLER_BUTTON_DPAD_UP] = INPUT_GAMEPAD_DPAD_UP,
[SDL_CONTROLLER_BUTTON_DPAD_DOWN] = INPUT_GAMEPAD_DPAD_DOWN,
[SDL_CONTROLLER_BUTTON_DPAD_LEFT] = INPUT_GAMEPAD_DPAD_LEFT,
[SDL_CONTROLLER_BUTTON_DPAD_RIGHT] = INPUT_GAMEPAD_DPAD_RIGHT,
[SDL_CONTROLLER_BUTTON_MAX] = INPUT_INVALID
};
uint8_t platform_sdl_axis_map[] = {
[SDL_CONTROLLER_AXIS_LEFTX] = INPUT_GAMEPAD_L_STICK_LEFT,
[SDL_CONTROLLER_AXIS_LEFTY] = INPUT_GAMEPAD_L_STICK_UP,
[SDL_CONTROLLER_AXIS_RIGHTX] = INPUT_GAMEPAD_R_STICK_LEFT,
[SDL_CONTROLLER_AXIS_RIGHTY] = INPUT_GAMEPAD_R_STICK_UP,
[SDL_CONTROLLER_AXIS_TRIGGERLEFT] = INPUT_GAMEPAD_L_TRIGGER,
[SDL_CONTROLLER_AXIS_TRIGGERRIGHT] = INPUT_GAMEPAD_R_TRIGGER,
[SDL_CONTROLLER_AXIS_MAX] = INPUT_INVALID
};
void platform_exit() {
wants_to_exit = true;
}
SDL_GameController *platform_find_gamepad() {
for (int i = 0; i < SDL_NumJoysticks(); i++) {
if (SDL_IsGameController(i)) {
return SDL_GameControllerOpen(i);
}
}
return NULL;
}
void platform_pump_events() {
SDL_Event ev;
while (SDL_PollEvent(&ev)) {
// Input Keyboard
if (ev.type == SDL_KEYDOWN || ev.type == SDL_KEYUP) {
int code = ev.key.keysym.scancode;
float state = ev.type == SDL_KEYDOWN ? 1.0 : 0.0;
if (code >= SDL_SCANCODE_LCTRL && code <= SDL_SCANCODE_RALT) {
int code_internal = code - SDL_SCANCODE_LCTRL + INPUT_KEY_LCTRL;
input_set_button_state(code_internal, state);
}
else if (code > 0 && code < INPUT_KEY_MAX) {
input_set_button_state(code, state);
}
}
else if (ev.type == SDL_TEXTINPUT) {
input_textinput(ev.text.text[0]);
}
// Gamepads connect/disconnect
else if (ev.type == SDL_CONTROLLERDEVICEADDED) {
gamepad = SDL_GameControllerOpen(ev.cdevice.which);
}
else if (ev.type == SDL_CONTROLLERDEVICEREMOVED) {
if (gamepad && ev.cdevice.which == SDL_JoystickInstanceID(SDL_GameControllerGetJoystick(gamepad))) {
SDL_GameControllerClose(gamepad);
gamepad = platform_find_gamepad();
}
}
// Input Gamepad Buttons
else if (
ev.type == SDL_CONTROLLERBUTTONDOWN ||
ev.type == SDL_CONTROLLERBUTTONUP
) {
if (ev.cbutton.button < SDL_CONTROLLER_BUTTON_MAX) {
button_t button = platform_sdl_gamepad_map[ev.cbutton.button];
if (button != INPUT_INVALID) {
float state = ev.type == SDL_CONTROLLERBUTTONDOWN ? 1.0 : 0.0;
input_set_button_state(button, state);
}
}
}
// Input Gamepad Axis
else if (ev.type == SDL_CONTROLLERAXISMOTION) {
float state = (float)ev.caxis.value / 32767.0;
if (ev.caxis.axis < SDL_CONTROLLER_AXIS_MAX) {
int code = platform_sdl_axis_map[ev.caxis.axis];
if (
code == INPUT_GAMEPAD_L_TRIGGER ||
code == INPUT_GAMEPAD_R_TRIGGER
) {
input_set_button_state(code, state);
}
else if (state > 0) {
input_set_button_state(code, 0.0);
input_set_button_state(code+1, state);
}
else {
input_set_button_state(code, -state);
input_set_button_state(code+1, 0.0);
}
}
}
// Mouse buttons
else if (
ev.type == SDL_MOUSEBUTTONDOWN ||
ev.type == SDL_MOUSEBUTTONUP
) {
button_t button = INPUT_BUTTON_NONE;
switch (ev.button.button) {
case SDL_BUTTON_LEFT: button = INPUT_MOUSE_LEFT; break;
case SDL_BUTTON_MIDDLE: button = INPUT_MOUSE_MIDDLE; break;
case SDL_BUTTON_RIGHT: button = INPUT_MOUSE_RIGHT; break;
default: break;
}
if (button != INPUT_BUTTON_NONE) {
float state = ev.type == SDL_MOUSEBUTTONDOWN ? 1.0 : 0.0;
input_set_button_state(button, state);
}
}
// Mouse wheel
else if (ev.type == SDL_MOUSEWHEEL) {
button_t button = ev.wheel.y > 0
? INPUT_MOUSE_WHEEL_UP
: INPUT_MOUSE_WHEEL_DOWN;
input_set_button_state(button, 1.0);
input_set_button_state(button, 0.0);
}
// Mouse move
else if (ev.type == SDL_MOUSEMOTION) {
input_set_mouse_pos(ev.motion.x, ev.motion.y);
}
// Window Events
if (ev.type == SDL_QUIT) {
wants_to_exit = true;
}
else if (
ev.type == SDL_WINDOWEVENT &&
(
ev.window.event == SDL_WINDOWEVENT_SIZE_CHANGED ||
ev.window.event == SDL_WINDOWEVENT_RESIZED
)
) {
system_resize(platform_screen_size());
}
}
}
vec2i_t platform_screen_size() {
int width, height;
SDL_GL_GetDrawableSize(window, &width, &height);
return vec2i(width, height);
}
double platform_now() {
uint64_t perf_counter = SDL_GetPerformanceCounter();
return (double)perf_counter / (double)perf_freq;
}
void platform_set_fullscreen(bool fullscreen) {
if (fullscreen) {
int32_t display = SDL_GetWindowDisplayIndex(window);
SDL_DisplayMode mode;
SDL_GetDesktopDisplayMode(display, &mode);
SDL_SetWindowDisplayMode(window, &mode);
SDL_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN);
}
else {
SDL_SetWindowFullscreen(window, 0);
}
}
void platform_audio_callback(void* userdata, uint8_t* stream, int len) {
if (audio_callback) {
audio_callback((float *)stream, len/sizeof(float));
}
else {
memset(stream, 0, len);
}
}
void platform_set_audio_mix_cb(void (*cb)(float *buffer, uint32_t len)) {
audio_callback = cb;
SDL_PauseAudioDevice(audio_device, 0);
}
#if defined(RENDERER_GL)
#define PLATFORM_WINDOW_FLAGS SDL_WINDOW_OPENGL
SDL_GLContext platform_gl;
void platform_video_init() {
platform_gl = SDL_GL_CreateContext(window);
SDL_GL_SetSwapInterval(1);
}
void platform_prepare_frame() {
// nothing
}
void platform_video_cleanup() {
SDL_GL_DeleteContext(platform_gl);
}
void platform_end_frame() {
SDL_GL_SwapWindow(window);
}
#else
#error "Unsupported renderer for platform SDL"
#endif
int main(int argc, char *argv[]) {
SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_GAMECONTROLLER);
audio_device = SDL_OpenAudioDevice(NULL, 0, &(SDL_AudioSpec){
.freq = 44100,
.format = AUDIO_F32,
.channels = 2,
.samples = 4096,
.callback = platform_audio_callback
}, NULL, 0);
gamepad = platform_find_gamepad();
perf_freq = SDL_GetPerformanceFrequency();
window = SDL_CreateWindow(
SYSTEM_WINDOW_NAME,
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
SYSTEM_WINDOW_WIDTH, SYSTEM_WINDOW_HEIGHT,
SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE | PLATFORM_WINDOW_FLAGS | SDL_WINDOW_ALLOW_HIGHDPI
);
platform_video_init();
system_init();
while (!wants_to_exit) {
platform_pump_events();
platform_prepare_frame();
system_update();
platform_end_frame();
}
system_cleanup();
platform_video_cleanup();
SDL_CloseAudioDevice(audio_device);
SDL_Quit();
return 0;
}