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Add: framebuffer driver and scrolling

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xamidev
2024-05-19 15:09:53 +02:00
parent 8d33440ced
commit 841dee9e18
6 changed files with 80 additions and 49 deletions
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39
stdio.c
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@@ -23,7 +23,7 @@ void putchar(int x, int y, char c)
fb[2*(y*VGA_WIDTH+x)] = c;
}
void putcolor(int x, int y, int color)
void putcolor(int x, int y, unsigned int color)
{
fb[2*(y*VGA_WIDTH+x)+1] = color;
}
@@ -43,6 +43,37 @@ void clear(void)
move_cursor(VGA_X, VGA_Y);
}
char getchar(int x, int y)
{
return fb[2*(y*VGA_WIDTH+x)];
}
unsigned int getcolor(int x, int y)
{
return fb[2*(y*VGA_WIDTH+x)+1];
}
void scroll(int lines)
{
for (unsigned int y = lines; y < VGA_HEIGHT; y++)
{
for (unsigned int x = 0; x < VGA_WIDTH; x++)
{
putchar(x, y-lines, getchar(x, y));
putcolor(x, y-lines, getcolor(x, y));
}
}
for (unsigned int y = VGA_HEIGHT-lines; y<VGA_HEIGHT; y++)
{
for (unsigned int x = 0; x < VGA_WIDTH; x++)
{
putchar(x, y, '\0');
putcolor(x, y, COLOR);
}
}
}
void putc(char c)
{
switch(c)
@@ -65,7 +96,7 @@ void putc(char c)
VGA_Y++;
VGA_X = 0;
}
//if (VGA_Y >= VGA_HEIGHT) scroll
if (VGA_Y >= VGA_HEIGHT) scroll(1);
move_cursor(VGA_X, VGA_Y);
}
@@ -79,7 +110,3 @@ void puts(const char* str)
}
}