u-boot/arch/sandbox/cpu/sdl.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2013 Google, Inc
*/
#include <errno.h>
#include <unistd.h>
#include <stdbool.h>
#include <linux/input.h>
#include <SDL2/SDL.h>
#include <asm/state.h>
/**
* struct buf_info - a data buffer holding audio data
*
* @pos: Current position playing in audio buffer
* @size: Size of data in audio buffer (0=empty)
* @alloced: Allocated size of audio buffer (max size it can hold)
* @data: Audio data
*/
struct buf_info {
uint pos;
uint size;
uint alloced;
uint8_t *data;
};
/**
* struct sdl_info - Information about our use of the SDL library
*
* @width: Width of simulated LCD display
* @height: Height of simulated LCD display
* @vis_width: Visible width (may be larger to allow for scaling up)
* @vis_height: Visible height (may be larger to allow for scaling up)
* @depth: Depth of the display in bits per pixel (16 or 32)
* @pitch: Number of bytes per line of the display
* @sample_rate: Current sample rate for audio
* @audio_active: true if audio can be used
* @inited: true if this module is initialised
* @cur_buf: Current audio buffer being used by sandbox_sdl_fill_audio (0 or 1)
* @buf: The two available audio buffers. SDL can be reading from one while we
* are setting up the next
* @running: true if audio is running
* @stopping: true if audio will stop once it runs out of data
* @texture: SDL texture to use for U-Boot display contents
* @renderer: SDL renderer to use
*/
static struct sdl_info {
int width;
int height;
int vis_width;
int vis_height;
int depth;
int pitch;
uint sample_rate;
bool audio_active;
bool inited;
int cur_buf;
struct buf_info buf[2];
bool running;
bool stopping;
SDL_Texture *texture;
SDL_Renderer *renderer;
} sdl;
static void sandbox_sdl_poll_events(void)
{
/*
* We don't want to include common.h in this file since it uses
* system headers. So add a declation here.
*/
extern void reset_cpu(void);
SDL_Event event;
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_QUIT:
puts("LCD window closed - quitting\n");
reset_cpu();
break;
}
}
}
static int sandbox_sdl_ensure_init(void)
{
if (!sdl.inited) {
if (SDL_Init(0) < 0) {
printf("Unable to initialise SDL: %s\n",
SDL_GetError());
return -EIO;
}
atexit(SDL_Quit);
sdl.inited = true;
}
return 0;
}
int sandbox_sdl_init_display(int width, int height, int log2_bpp,
bool double_size)
{
struct sandbox_state *state = state_get_current();
int err;
if (!width || !state->show_lcd)
return 0;
err = sandbox_sdl_ensure_init();
if (err)
return err;
if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
printf("Unable to initialise SDL LCD: %s\n", SDL_GetError());
return -EPERM;
}
sdl.width = width;
sdl.height = height;
if (double_size) {
sdl.vis_width = sdl.width * 2;
sdl.vis_height = sdl.height * 2;
} else {
sdl.vis_width = sdl.width;
sdl.vis_height = sdl.height;
}
sdl.depth = 1 << log2_bpp;
sdl.pitch = sdl.width * sdl.depth / 8;
SDL_Window *screen = SDL_CreateWindow("U-Boot", SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED,
sdl.vis_width, sdl.vis_height,
SDL_WINDOW_RESIZABLE);
if (!screen) {
printf("Unable to initialise SDL screen: %s\n",
SDL_GetError());
return -EIO;
}
if (log2_bpp != 4 && log2_bpp != 5) {
printf("U-Boot SDL does not support depth %d\n", log2_bpp);
return -EINVAL;
}
sdl.renderer = SDL_CreateRenderer(screen, -1,
SDL_RENDERER_ACCELERATED |
SDL_RENDERER_PRESENTVSYNC);
if (!sdl.renderer) {
printf("Unable to initialise SDL renderer: %s\n",
SDL_GetError());
return -EIO;
}
sdl.texture = SDL_CreateTexture(sdl.renderer, log2_bpp == 4 ?
SDL_PIXELFORMAT_RGB565 :
SDL_PIXELFORMAT_RGB888,
SDL_TEXTUREACCESS_STREAMING,
width, height);
if (!sdl.texture) {
printf("Unable to initialise SDL texture: %s\n",
SDL_GetError());
return -EBADF;
}
sandbox_sdl_poll_events();
return 0;
}
int sandbox_sdl_sync(void *lcd_base)
{
SDL_UpdateTexture(sdl.texture, NULL, lcd_base, sdl.pitch);
SDL_RenderCopy(sdl.renderer, sdl.texture, NULL, NULL);
SDL_RenderPresent(sdl.renderer);
sandbox_sdl_poll_events();
return 0;
}
static const unsigned short sdl_to_keycode[SDL_NUM_SCANCODES] = {
[SDL_SCANCODE_ESCAPE] = KEY_ESC,
[SDL_SCANCODE_1] = KEY_1,
[SDL_SCANCODE_2] = KEY_2,
[SDL_SCANCODE_3] = KEY_3,
[SDL_SCANCODE_4] = KEY_4,
[SDL_SCANCODE_5] = KEY_5,
[SDL_SCANCODE_6] = KEY_6,
[SDL_SCANCODE_7] = KEY_7,
[SDL_SCANCODE_8] = KEY_8,
[SDL_SCANCODE_9] = KEY_9,
[SDL_SCANCODE_0] = KEY_0,
[SDL_SCANCODE_MINUS] = KEY_MINUS,
[SDL_SCANCODE_EQUALS] = KEY_EQUAL,
[SDL_SCANCODE_BACKSPACE] = KEY_BACKSPACE,
[SDL_SCANCODE_TAB] = KEY_TAB,
[SDL_SCANCODE_Q] = KEY_Q,
[SDL_SCANCODE_W] = KEY_W,
[SDL_SCANCODE_E] = KEY_E,
[SDL_SCANCODE_R] = KEY_R,
[SDL_SCANCODE_T] = KEY_T,
[SDL_SCANCODE_Y] = KEY_Y,
[SDL_SCANCODE_U] = KEY_U,
[SDL_SCANCODE_I] = KEY_I,
[SDL_SCANCODE_O] = KEY_O,
[SDL_SCANCODE_P] = KEY_P,
[SDL_SCANCODE_LEFTBRACKET] = KEY_LEFTBRACE,
[SDL_SCANCODE_RIGHTBRACKET] = KEY_RIGHTBRACE,
[SDL_SCANCODE_RETURN] = KEY_ENTER,
[SDL_SCANCODE_LCTRL] = KEY_LEFTCTRL,
[SDL_SCANCODE_A] = KEY_A,
[SDL_SCANCODE_S] = KEY_S,
[SDL_SCANCODE_D] = KEY_D,
[SDL_SCANCODE_F] = KEY_F,
[SDL_SCANCODE_G] = KEY_G,
[SDL_SCANCODE_H] = KEY_H,
[SDL_SCANCODE_J] = KEY_J,
[SDL_SCANCODE_K] = KEY_K,
[SDL_SCANCODE_L] = KEY_L,
[SDL_SCANCODE_SEMICOLON] = KEY_SEMICOLON,
[SDL_SCANCODE_APOSTROPHE] = KEY_APOSTROPHE,
[SDL_SCANCODE_GRAVE] = KEY_GRAVE,
[SDL_SCANCODE_LSHIFT] = KEY_LEFTSHIFT,
[SDL_SCANCODE_BACKSLASH] = KEY_BACKSLASH,
[SDL_SCANCODE_Z] = KEY_Z,
[SDL_SCANCODE_X] = KEY_X,
[SDL_SCANCODE_C] = KEY_C,
[SDL_SCANCODE_V] = KEY_V,
[SDL_SCANCODE_B] = KEY_B,
[SDL_SCANCODE_N] = KEY_N,
[SDL_SCANCODE_M] = KEY_M,
[SDL_SCANCODE_COMMA] = KEY_COMMA,
[SDL_SCANCODE_PERIOD] = KEY_DOT,
[SDL_SCANCODE_SLASH] = KEY_SLASH,
[SDL_SCANCODE_RSHIFT] = KEY_RIGHTSHIFT,
[SDL_SCANCODE_KP_MULTIPLY] = KEY_KPASTERISK,
[SDL_SCANCODE_LALT] = KEY_LEFTALT,
[SDL_SCANCODE_SPACE] = KEY_SPACE,
[SDL_SCANCODE_CAPSLOCK] = KEY_CAPSLOCK,
[SDL_SCANCODE_F1] = KEY_F1,
[SDL_SCANCODE_F2] = KEY_F2,
[SDL_SCANCODE_F3] = KEY_F3,
[SDL_SCANCODE_F4] = KEY_F4,
[SDL_SCANCODE_F5] = KEY_F5,
[SDL_SCANCODE_F6] = KEY_F6,
[SDL_SCANCODE_F7] = KEY_F7,
[SDL_SCANCODE_F8] = KEY_F8,
[SDL_SCANCODE_F9] = KEY_F9,
[SDL_SCANCODE_F10] = KEY_F10,
[SDL_SCANCODE_NUMLOCKCLEAR] = KEY_NUMLOCK,
[SDL_SCANCODE_SCROLLLOCK] = KEY_SCROLLLOCK,
[SDL_SCANCODE_KP_7] = KEY_KP7,
[SDL_SCANCODE_KP_8] = KEY_KP8,
[SDL_SCANCODE_KP_9] = KEY_KP9,
[SDL_SCANCODE_KP_MINUS] = KEY_KPMINUS,
[SDL_SCANCODE_KP_4] = KEY_KP4,
[SDL_SCANCODE_KP_5] = KEY_KP5,
[SDL_SCANCODE_KP_6] = KEY_KP6,
[SDL_SCANCODE_KP_PLUS] = KEY_KPPLUS,
[SDL_SCANCODE_KP_1] = KEY_KP1,
[SDL_SCANCODE_KP_2] = KEY_KP2,
[SDL_SCANCODE_KP_3] = KEY_KP3,
[SDL_SCANCODE_KP_0] = KEY_KP0,
[SDL_SCANCODE_KP_PERIOD] = KEY_KPDOT,
/* key 84 does not exist linux_input.h */
[SDL_SCANCODE_LANG5] = KEY_ZENKAKUHANKAKU,
[SDL_SCANCODE_NONUSBACKSLASH] = KEY_102ND,
[SDL_SCANCODE_F11] = KEY_F11,
[SDL_SCANCODE_F12] = KEY_F12,
[SDL_SCANCODE_INTERNATIONAL1] = KEY_RO,
[SDL_SCANCODE_LANG3] = KEY_KATAKANA,
[SDL_SCANCODE_LANG4] = KEY_HIRAGANA,
[SDL_SCANCODE_INTERNATIONAL4] = KEY_HENKAN,
[SDL_SCANCODE_INTERNATIONAL2] = KEY_KATAKANAHIRAGANA,
[SDL_SCANCODE_INTERNATIONAL5] = KEY_MUHENKAN,
/* [SDL_SCANCODE_INTERNATIONAL5] -> [KEY_KPJPCOMMA] */
[SDL_SCANCODE_KP_ENTER] = KEY_KPENTER,
[SDL_SCANCODE_RCTRL] = KEY_RIGHTCTRL,
[SDL_SCANCODE_KP_DIVIDE] = KEY_KPSLASH,
[SDL_SCANCODE_SYSREQ] = KEY_SYSRQ,
[SDL_SCANCODE_RALT] = KEY_RIGHTALT,
/* KEY_LINEFEED */
[SDL_SCANCODE_HOME] = KEY_HOME,
[SDL_SCANCODE_UP] = KEY_UP,
[SDL_SCANCODE_PAGEUP] = KEY_PAGEUP,
[SDL_SCANCODE_LEFT] = KEY_LEFT,
[SDL_SCANCODE_RIGHT] = KEY_RIGHT,
[SDL_SCANCODE_END] = KEY_END,
[SDL_SCANCODE_DOWN] = KEY_DOWN,
[SDL_SCANCODE_PAGEDOWN] = KEY_PAGEDOWN,
[SDL_SCANCODE_INSERT] = KEY_INSERT,
[SDL_SCANCODE_DELETE] = KEY_DELETE,
/* KEY_MACRO */
[SDL_SCANCODE_MUTE] = KEY_MUTE,
[SDL_SCANCODE_VOLUMEDOWN] = KEY_VOLUMEDOWN,
[SDL_SCANCODE_VOLUMEUP] = KEY_VOLUMEUP,
[SDL_SCANCODE_POWER] = KEY_POWER,
[SDL_SCANCODE_KP_EQUALS] = KEY_KPEQUAL,
[SDL_SCANCODE_KP_PLUSMINUS] = KEY_KPPLUSMINUS,
[SDL_SCANCODE_PAUSE] = KEY_PAUSE,
/* KEY_SCALE */
[SDL_SCANCODE_KP_COMMA] = KEY_KPCOMMA,
[SDL_SCANCODE_LANG1] = KEY_HANGUEL,
[SDL_SCANCODE_LANG2] = KEY_HANJA,
[SDL_SCANCODE_INTERNATIONAL3] = KEY_YEN,
[SDL_SCANCODE_LGUI] = KEY_LEFTMETA,
[SDL_SCANCODE_RGUI] = KEY_RIGHTMETA,
[SDL_SCANCODE_APPLICATION] = KEY_COMPOSE,
};
int sandbox_sdl_scan_keys(int key[], int max_keys)
{
const Uint8 *keystate;
int num_keys;
int i, count;
sandbox_sdl_poll_events();
keystate = SDL_GetKeyboardState(&num_keys);
for (i = count = 0; i < num_keys; i++) {
if (count < max_keys && keystate[i]) {
int keycode = sdl_to_keycode[i];
if (keycode)
key[count++] = keycode;
}
}
return count;
}
int sandbox_sdl_key_pressed(int keycode)
{
int key[8]; /* allow up to 8 keys to be pressed at once */
int count;
int i;
count = sandbox_sdl_scan_keys(key, sizeof(key) / sizeof(key[0]));
for (i = 0; i < count; i++) {
if (key[i] == keycode)
return 0;
}
return -ENOENT;
}
void sandbox_sdl_fill_audio(void *udata, Uint8 *stream, int len)
{
struct buf_info *buf;
int avail;
bool have_data = false;
int i;
for (i = 0; i < 2; i++) {
buf = &sdl.buf[sdl.cur_buf];
avail = buf->size - buf->pos;
if (avail <= 0) {
sdl.cur_buf = 1 - sdl.cur_buf;
continue;
}
if (avail > len)
avail = len;
have_data = true;
SDL_MixAudio(stream, buf->data + buf->pos, avail,
SDL_MIX_MAXVOLUME);
buf->pos += avail;
len -= avail;
/* Move to next buffer if we are at the end */
if (buf->pos == buf->size)
buf->size = 0;
else
break;
}
sdl.stopping = !have_data;
}
int sandbox_sdl_sound_init(int rate, int channels)
{
SDL_AudioSpec wanted, have;
int i;
if (sandbox_sdl_ensure_init())
return -1;
if (sdl.audio_active)
return 0;
/* Set the audio format */
wanted.freq = rate;
wanted.format = AUDIO_S16;
wanted.channels = channels;
wanted.samples = 1024; /* Good low-latency value for callback */
wanted.callback = sandbox_sdl_fill_audio;
wanted.userdata = NULL;
for (i = 0; i < 2; i++) {
struct buf_info *buf = &sdl.buf[i];
buf->alloced = sizeof(uint16_t) * wanted.freq * wanted.channels;
buf->data = malloc(buf->alloced);
if (!buf->data) {
printf("%s: Out of memory\n", __func__);
if (i == 1)
free(sdl.buf[0].data);
return -1;
}
buf->pos = 0;
buf->size = 0;
}
if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
printf("Unable to initialise SDL audio: %s\n", SDL_GetError());
goto err;
}
/* Open the audio device, forcing the desired format */
if (SDL_OpenAudio(&wanted, &have) < 0) {
printf("Couldn't open audio: %s\n", SDL_GetError());
goto err;
}
if (have.format != wanted.format) {
printf("Couldn't select required audio format\n");
goto err;
}
sdl.audio_active = true;
sdl.sample_rate = wanted.freq;
sdl.cur_buf = 0;
sdl.running = false;
return 0;
err:
for (i = 0; i < 2; i++)
free(sdl.buf[i].data);
return -1;
}
int sandbox_sdl_sound_play(const void *data, uint size)
{
struct buf_info *buf;
if (!sdl.audio_active)
return 0;
buf = &sdl.buf[0];
if (buf->size)
buf = &sdl.buf[1];
while (buf->size)
usleep(1000);
if (size > buf->alloced)
return -E2BIG;
memcpy(buf->data, data, size);
buf->size = size;
buf->pos = 0;
if (!sdl.running) {
SDL_PauseAudio(0);
sdl.running = true;
sdl.stopping = false;
}
return 0;
}
int sandbox_sdl_sound_stop(void)
{
if (sdl.running) {
while (!sdl.stopping)
SDL_Delay(100);
SDL_PauseAudio(1);
sdl.running = 0;
sdl.stopping = false;
}
return 0;
}