VGA mode 0x13 Y Axis issue
Posted: Thu Jan 23, 2025 11:13 am
hello, im making a basic os (im a beginner), im trying to use the 0x13 VGA mode (320x200), but the Y axis is 0-25, not 0-200, it like stretches? Here is how it looks:
my code:
my code:
Code: Select all
void VGA_PUT_PIXEL(int x, int y, unsigned char color)
{
unsigned char* location = (unsigned char*)0xA0000 + 320 * y + x;
*location = color;
}
void VGA_CLEAR(unsigned char color)
{
for (int x = 0; x < VGA_WIDTH; ++x)
{
for (int y = 0; y < VGA_HEIGHT; ++y)
{
VGA_PUT_PIXEL(x, y, color);
}
}
}
void VGA_INIT()
{
OUTB(0x3C2, 0x63);
OUTW(0x3D4,0x0E11);
OUTW(0x3D4,0x0008);
OUTW(0x3D4,0x4014);
OUTW(0x3D4,0xa317);
OUTW(0x3C4,0x0e04);
OUTW(0x3C4,0x0101);
OUTW(0x3C4,0x0f02);
OUTW(0x3Ce,0x4005);
OUTW(0x3Ce,0x0506);
INB(0x3DA);
OUTB(0x3C0,0x30);
OUTB(0x3C0,0x41);
OUTB(0x3C0,0x33);
OUTB(0x3C0,0x00);
VGA_CLEAR(GET_VGA_COLOR(0x000));
}
void VGA_RECT(int _x, int _y, int width, int height, unsigned char color)
{
for (int x = _x; x < _x + width; x++) {
VGA_PUT_PIXEL(x, _y, color);
VGA_PUT_PIXEL(x, _y + height - 1, color);
}
for (int y = _y; y < _y + height; y++) {
VGA_PUT_PIXEL(_x, y, color);
VGA_PUT_PIXEL(_x + width - 1, y, color);
}
}
Code: Select all
VGA_RECT(0, 0, 320, 25, GET_VGA_COLOR(0xFFF));