setos

commit 820b923e9d99e71684cc5e079f14cccf783dcebe
parent f22df7b05b163af203ce1ac244eb49245b459a92
Author: Matsuda Kenji <info@mtkn.jp>
Date:   Sat, 30 Mar 2024 14:33:23 +0900

draw rising sun

Diffstat:
M
kernel.c
 | 
8
+++++++-

1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/kernel.c b/kernel.c
@@ -13,9 +13,15 @@ kernel_main(void *dummy0, void *dummy1, void *dummy2,
 	uint32_t hrez = gop->Mode->Info->HorizontalResolution;
 	uint32_t vrez = gop->Mode->Info->VerticalResolution;
 	uint32_t sl = gop->Mode->Info->PixelsPerScanLine;
+	uint32_t cx = hrez / 2;
+	uint32_t cy = vrez / 2;
 	for (int i = 0; i < vrez; i++) {
 		for (int j = 0; j < hrez; j++) {
-			fb_base[i * sl + j] = (j % 0xff) << 8;
+			if ((cx-j)*(cx-j) + (cy-i)*(cy-i) < (vrez/3) * (vrez/3)) {
+				fb_base[i * sl + j] = 0xff << 16;
+			} else {
+				fb_base[i * sl + j] = 0xffffff;
+			}
 		}
 	}
 	for(;;);