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The most important thing in the world

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Tom-on
2026-02-03 18:49:12 +01:00
parent 2b4beae3c5
commit d9471572b8
2 changed files with 57 additions and 0 deletions
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kernel/include/splash.h
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#ifndef _SPLASH_H
#define _SPLASH_H
/*
* This is the most important function in the world.
*
* It draws this to the zeroth framebuffer:
* #
* #
* #
* # # ## # ## # ##
* # # # # ## # ## #
* ## ### # # #
* # # # # # #
* # # ### # # # #
*/
void splash(void);
#endif
kernel/src/splash.c
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#include <bootloader.h>
#include <kernel.h>
#include <splash.h>
#define BITMAP_LEN 24
#define PX_SIZE 2
uint8_t bitmap[BITMAP_LEN] = {
0xff, 0x04, 0x0a, 0x11, 0x00, 0x0e, 0x15, 0x15,
0x09, 0x00, 0x1f, 0x08, 0x10, 0x10, 0x08, 0x00,
0x1f, 0x08, 0x10, 0x10, 0x0f, 0x00, 0x01, 0x00,
};
static inline void putpx(uint32_t* fb, uint64_t pitch, uint64_t x, uint64_t y, uint32_t c) {
for (uint64_t dx = 0; dx < PX_SIZE; dx++) {
for (uint64_t dy = 0; dy < PX_SIZE; dy++) {
fb[((y * PX_SIZE) + dy) * pitch + ((x * PX_SIZE) + dx)] = c;
}
}
}
void splash(void) {
uint32_t* fb = bootloader.fb_entries[0]->address;
uint64_t width = bootloader.fb_entries[0]->width;
uint64_t height = bootloader.fb_entries[0]->height;
uint64_t pitch = bootloader.fb_entries[0]->pitch / 4;
uint64_t x = (width - BITMAP_LEN * PX_SIZE) / 2 / PX_SIZE;
uint64_t y = (height - 8 * PX_SIZE) / 2 / PX_SIZE;
for (size_t dx = 0; dx < BITMAP_LEN; dx++) {
for (uint8_t dy = 0; dy < 8; dy++) {
if (bitmap[dx] & (1 << (7 - dy))) putpx(fb, pitch, x + dx, y + dy, 0xFFC6D6D6);
}
}
}