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Add arrow key handling, fix Rect and Texture structures (#273)
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@ghaerr
ghaerr authored May 23, 2023
1 parent 7814b3c commit 9ef7845
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Showing 2 changed files with 246 additions and 32 deletions.
267 changes: 236 additions & 31 deletions src/gui_fb.c
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@
#include <poll.h>
#include <termios.h>
#include <signal.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <linux/fb.h>
Expand Down Expand Up @@ -42,22 +43,22 @@
typedef uint32_t pixel_t; /* fixed ARGB8888 for now */

typedef struct rect {
int x, y;
int w, h;
int32_t x, y;
int32_t w, h;
} Rect;

typedef struct drawable {
int pixtype; /* pixel format */
int bpp; /* bits per pixel */
int bytespp; /* bytes per pixel */
int width; /* width in pixels */
int height; /* height in pixels */
int pitch; /* stride in bytes, offset to next pixel row */
int size; /* total size in bytes */
unsigned char *pixels; /* pixel data */
int32_t pixtype; /* pixel format */
int32_t bpp; /* bits per pixel */
int32_t bytespp; /* bytes per pixel */
int32_t width; /* width in pixels */
int32_t height; /* height in pixels */
int32_t pitch; /* stride in bytes, offset to next pixel row */
int32_t size; /* total size in bytes */
uint8_t *pixels; /* pixel data */
uint32_t r, g, b; /* premul colors to use for color mod blit */
uint32_t color; /* combined premul colors or 0x00fffff for source blend */
uint8_t data[]; /* texture data allocated in single malloc */
pixel_t data[]; /* texture data allocated in single malloc */
} Drawable, Texture;

static struct termios orig;
Expand All @@ -75,6 +76,7 @@ static int open_framebuffer(void);
static int open_keyboard(void);
static int open_mouse(void);
static int read_mouse(int *dx, int *dy, int *dw, int *bp);
static ssize_t readansi(int fd, char *buf, size_t size);
static void close_framebuffer(void);
static void close_keyboard(void);
static void close_mouse(void);
Expand Down Expand Up @@ -206,7 +208,7 @@ Texture *host_gui_create_texture(void *data, uint64_t width, uint64_t height, ui
t->height = height;
t->pitch = pitch;
t->size = size;
t->pixels = t->data;
t->pixels = (uint8_t *)t->data;
t->r = t->g = t->b = 0xff;
t->color = 0xffffff;
memcpy(t->pixels, data, t->size);
Expand Down Expand Up @@ -394,7 +396,6 @@ void host_gui_blit(Texture *texture, const Rect *srect, const Rect *drect)
#define BUTTON_SCROLLUP 0x20 /* wheel up*/
#define BUTTON_SCROLLDN 0x40 /* wheel down*/


/*
* Lookup table to convert ascii characters in to keyboard scan codes
* Format: most signifficant bit indicates if scan code should be sent with shift modifier
Expand Down Expand Up @@ -531,6 +532,62 @@ const uint8_t ascii_to_scan_code_table[128] = {
/* ASCII: 127 */ 0
};

/* convert from ANSI keyboard sequence to scancode */
static int ansi_to_scancode(char *buf, int n)
{
if (n >= 1 && buf[0] == 033) {
if (buf[1] == '[') {
if (n == 3) { /* xterm sequences */
switch (buf[2]) { /* ESC [ A etc */
case 'A': return SDL_SCANCODE_UP; // kUpArrow
case 'B': return SDL_SCANCODE_DOWN; // kDownArrow
case 'C': return SDL_SCANCODE_RIGHT; // kRightArrow
case 'D': return SDL_SCANCODE_LEFT; // kLeftArrow
case 'F': return SDL_SCANCODE_END; // kEnd
case 'H': return SDL_SCANCODE_HOME; // kHome
}
}
#if 0
else if (n == 4 && buf[2] == '1') { /* ESC [ 1 P etc */
switch (buf[3]) {
case 'P': return 0x3B; // kF1
case 'Q': return 0x3C; // kF2
case 'R': return 0x3D; // kF3
case 'S': return 0x3E; // kF4
}
}
#endif
if (n > 3 && buf[n-1] == '~') { /* vt sequences */
switch (atoi(buf+2)) {
case 1: return SDL_SCANCODE_HOME; // kHome
case 2: return SDL_SCANCODE_INSERT; // kInsert
case 3: return SDL_SCANCODE_DELETE; // kDelete
case 4: return SDL_SCANCODE_END; // kEnd
case 5: return SDL_SCANCODE_PAGEUP; // kPageUp
case 6: return SDL_SCANCODE_PAGEDOWN; // kPageDown
case 7: return SDL_SCANCODE_HOME; // kHome
case 8: return SDL_SCANCODE_END; // kEnd
#if 0
case 11: return 0x3B; // kF1
case 12: return 0x3C; // kF2
case 13: return 0x3D; // kF3
case 14: return 0x3E; // kF4
case 15: return 0x3F; // kF5
case 17: return 0x40; // kF6
case 18: return 0x41; // kF7
case 19: return 0x42; // kF8
case 20: return 0x43; // kF9
case 21: return 0x44; // kF10
case 23: return 0x85; // kF11
case 24: return 0x86; // kF12
#endif
}
}
}
}
return 0;
}

/* msec timeout 0 to poll, timeout -1 to block */
static uint64_t get_event_timeout(void *data, int timeout)
{
Expand All @@ -544,24 +601,34 @@ static uint64_t get_event_timeout(void *data, int timeout)
if (poll(fds, 2, timeout) >= 0) {
memset(event, 0, sizeof(SDL_Event));
if (fds[0].revents & POLLIN) {
unsigned char buf[1];
if (read(keybd_fd, buf, 1) == 1) {
int c = buf[0];
int c, n;
unsigned char buf[16];
if ((n = readansi(keybd_fd, buf, sizeof(buf))) > 0) {
if (n > 1) {
c = ansi_to_scancode(buf, n);
event->type = SDL_KEYDOWN;
event->key.state = SDL_PRESSED;
event->key.keysym.scancode = c;
event->key.keysym.sym = (1 << 30) | c;
return 1;
} else {
c = buf[0];
#if DEBUG
if (c == 033) exit(0); /* exit on ESC! */
if (c == 033) exit(0); /* exit on ESC! */
#endif
if (c == 0x7F) c = '\b';
if (c == '\r') c = '\n';
event->type = SDL_KEYDOWN;
event->key.state = SDL_PRESSED;
if (c <= ' ' & c != '\n' && c != '\b' && c != '\t') {
event->key.keysym.mod = KMOD_CTRL;
c += 'a' - 1;
if (c == 0x7F) c = '\b';
if (c == '\r') c = '\n';
event->type = SDL_KEYDOWN;
event->key.state = SDL_PRESSED;
if (c <= ' ' & c != '\n' && c != '\b' && c != '\t') {
event->key.keysym.mod = KMOD_CTRL;
c += 'a' - 1;
}
event->key.keysym.sym = c;
int scancode = ascii_to_scan_code_table[c & 0x7f];
event->key.keysym.scancode = scancode & 127;
if (scancode & 0x80) event->key.keysym.mod |= KMOD_SHIFT;
}
event->key.keysym.sym = c;
int scancode = ascii_to_scan_code_table[c & 0x7f];
event->key.keysym.scancode = scancode & 127;
if (scancode & 0x80) event->key.keysym.mod |= KMOD_SHIFT;
return 1;
}
}
Expand Down Expand Up @@ -772,8 +839,13 @@ static int open_framebuffer(void)
break;
}
}
printf("%dx%dx%dbpp pitch %d type %d visual %d pixtype %d\n",
fb.width, fb.height, fb.bpp, fb.pitch, type, visual, fb.pixtype);
printf("%dx%dx%dbpp (a%d:%d, r%d:%d, g%d:%d, b%d:%d) ", fb.width, fb.height, fb.bpp,
fb_var.transp.offset, fb_var.transp.length,
fb_var.red.offset, fb_var.red.length,
fb_var.green.offset, fb_var.green.length,
fb_var.blue.offset, fb_var.blue.length);
printf("pitch %d type %d visual %d pixtype %d\n",
fb.pitch, type, visual, fb.pixtype);

if (fb.pixtype <= PF_UNKNOWN) {
printf("Unsupported framebuffer type\n");
Expand Down Expand Up @@ -920,7 +992,7 @@ static int open_keyboard(void)
new.c_iflag &= ~(ICRNL | INPCK | ISTRIP | IXON | BRKINT);
new.c_cflag &= ~(CSIZE | PARENB);
new.c_cflag |= CS8;
new.c_cc[VMIN] = 0;
new.c_cc[VMIN] = 1;
new.c_cc[VTIME] = 0;
tcsetattr(keybd_fd, TCSAFLUSH, &new);
return keybd_fd;
Expand All @@ -934,5 +1006,138 @@ static void close_keyboard(void)
}
keybd_fd = -1;
}

/*═════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#define ThomPikeCont(x) (((x)&0300) == 0200)
#define ThomPikeByte(x) ((x) & (((1 << ThomPikeMsb(x)) - 1) | 3))
#define ThomPikeLen(x) (7 - ThomPikeMsb(x))
#define ThomPikeMsb(x) (((x)&0xff) < 252 ? bsr(~(x)&0xff) : 1)
#define ThomPikeMerge(x, y) ((x) << 6 | ((y)&077))

#if defined(__GNUC__)
#define bsr(x) ((x)? (__builtin_clz(x) ^ ((sizeof(int) * 8) -1)): 0)
#else
int bsr(int n)
{
if (n == 0) return 0; /* avoid incorrect result of 31 returned! */
return (__builtin_clz(n) ^ ((sizeof(int) * 8) - 1));
}
#endif

static ssize_t readansi(int fd, char *buf, size_t size)
{
uint8_t c;
int rc, i, j;
enum { kAscii, kUtf8, kEsc, kCsi, kSs } t;
if (size) buf[0] = 0;
for (j = i = 0, t = kAscii;;) {
if (i + 2 >= size) {
errno = ENOMEM;
return -1;
}
if ((rc = read(fd, &c, 1)) != 1) {
if (rc == -1 && errno == EINTR && i) {
continue;
}
/* linux kernel will return EAGAIN after lone ESC typed */
if (rc == -1 && errno == EAGAIN) {
return i;
}
return rc;
}
buf[i++] = c;
buf[i] = 0;
switch (t) {
case kAscii:
if (c < 0200) {
if (c == 033) {
t = kEsc;
} else {
return i;
}
} else if (c >= 0300) {
t = kUtf8;
j = ThomPikeLen(c) - 1;
}
break;
case kUtf8:
/*if (!--j) return i;*/
if (!--j) return 0; /* discard UTF-8 for now */
break;
case kEsc:
switch (c) {
case '[':
t = kCsi;
break;
case 'N':
case 'O':
t = kSs;
break;
case 0x20:
case 0x21:
case 0x22:
case 0x23:
case 0x24:
case 0x25:
case 0x26:
case 0x27:
case 0x28:
case 0x29:
case 0x2A:
case 0x2B:
case 0x2C:
case 0x2D:
case 0x2E:
case 0x2F:
break;
default:
return i;
}
break;
case kCsi:
switch (c) {
case ':':
case ';':
case '<':
case '=':
case '>':
case '?':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
break;
default:
return i;
}
break;
case kSs:
return i;
default:
__builtin_unreachable();
}
}
}
#endif /* _HOST_GUI == 1 */
#endif /* defined(_HOST_GUI) */
11 changes: 10 additions & 1 deletion src/sdl-dummy.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,16 @@ typedef int32_t Sint32;
typedef struct keysym SDL_Keysym;
typedef Sint32 SDL_Keycode;
enum scancode {
SDL_SCANCODE_UNKNOWN = 0
SDL_SCANCODE_INSERT = 73,
SDL_SCANCODE_HOME = 74,
SDL_SCANCODE_PAGEUP = 75,
SDL_SCANCODE_DELETE = 76,
SDL_SCANCODE_END = 77,
SDL_SCANCODE_PAGEDOWN = 78,
SDL_SCANCODE_RIGHT = 79,
SDL_SCANCODE_LEFT = 80,
SDL_SCANCODE_DOWN = 81,
SDL_SCANCODE_UP = 82,
};
typedef enum scancode SDL_Scancode;

Expand Down

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