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#include "aplos.h"
#define FOREGROUND 0x442A13
#define BACKGROUND 0xE3DFD7
static struct framebuffer *fb;
static volatile uint32_t *fb_mem;
static uint32_t row;
static uint32_t col;
static void screen_clear(void);
static int print_fmt(char8_t *, va_list);
void
screen_init(struct framebuffer *framebuffer)
{
fb = framebuffer;
fb_mem = fb->addr;
screen_clear();
font_init();
}
void
screen_draw_pixel(uint32_t x, uint32_t y, uint32_t c)
{
fb_mem[x + y * (fb->pitch/4)] = c;
}
static int nested;
void
print(char8_t *fmt, ...)
{
va_list args;
va_start(args, fmt);
int n;
for(char8_t *p = fmt; *p; p += utf8_char_length(p)){
switch(*p){
default:
print_char:
font_draw(p, row, col, BACKGROUND, FOREGROUND);
col++;
break;
case '\n':
row++;
col = 0;
break;
case '\t':
col = (col+8) & ~7;
break;
case '%':
n = print_fmt(p, args);
if(n == 0)
goto print_char;
while(n-- > 1)
p += utf8_char_length(p);
break;
}
}
va_end(args);
}
static void
screen_clear(void)
{
for(uint64_t y = 0; y < fb->height; y++){
for(uint64_t x = 0; x < fb->width; x++){
fb_mem[x + y * (fb->pitch/4)] = BACKGROUND;
}
}
}
static int
print_fmt(char8_t *fmt, va_list args)
{
if(nested)
return 0;
char8_t digits[] = u8"0123456789ABCDEF";
char8_t *prefixes[17] = {0};
char8_t buf[65];
char8_t *p = &buf[nelem(buf)-1];
prefixes[2] = u8"0b";
prefixes[8] = u8"0o";
prefixes[16] = u8"0x";
*p = 0;
#define UINT(spec, n, base, min, type) \
if(utf8_cmp_n(fmt, spec, 2+n) == 0){ \
type v = va_arg(args, type); \
int w = min; \
do{ \
p--; \
*p = digits[v%base]; \
v = v / base; \
if(w) \
w--; \
}while(v || w); \
if(prefixes[base]) \
print(prefixes[base]); \
print(p); \
return 2+n; \
}
#define UINTS(bits, n, type) \
UINT(u8"%b" #bits, n, 2, 0, type) \
UINT(u8"%o" #bits, n, 8, 0, type) \
UINT(u8"%u" #bits, n, 10, 0, type) \
UINT(u8"%x" #bits, n, 16, 0, type) \
UINTS(64, 2, uint64_t);
UINTS(32, 2, uint32_t);
UINTS(16, 2, int);
UINTS(8, 1, int);
UINT(u8"%p", 0, 16, 16, uintptr_t);
if(utf8_cmp_n(fmt, u8"%s", 2) == 0){
char8_t *str = va_arg(args, char8_t *);
nested++;
print(str);
nested--;
return 2;
}
return 0;
}
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