feat: basic framebuffer

1 files changed, 20 insertions, 3 deletions

diff --git a/boot/boot.zig b/boot/boot.zig
index a7822af..2303409 100644
--- a/boot/boot.zig
+++ b/boot/boot.zig
@@ -1,6 +1,7 @@
 const std = @import("std");
 const limine = @import("limine.zig");
 const serial = @import("serial.zig");
+const framebuffer = @import("framebuffer.zig");
 
 // We need a panic handler otherwise zig won't be happy,
 // std usually formats a message through std.Io.Writer which
@@ -9,9 +10,9 @@ const serial = @import("serial.zig");
 pub const panic = std.debug.FullPanic(struct {
     fn halt(msg: []const u8, _: ?usize) noreturn {
         serial.init();
-        serial.write("\n!!! uhhhh engine kaput : ");
+        serial.write("\r\n!!! uhhhh engine kaput : ");
         serial.write(msg);
-        serial.write("\n");
+        serial.write("\r\n");
         while (true) asm volatile ("hlt");
     }
 }.halt);
@@ -24,6 +25,22 @@ export var requests_end: limine.RequestsEndMarker linksection(".limine_requests_
 // ENTRY(_start)
 export fn _start() callconv(.c) noreturn {
     serial.init();
-    serial.write("if you see this, it means revel didn't shit the bed");
+    serial.write("if you see this, it means revel didn't shit the bed\r\n");
+
+    if (framebuffer.get()) |screen| {
+        // XOR texture
+        var y: usize = 0;
+        while (y < screen.height) : (y += 1) {
+            var x: usize = 0;
+            while (x < screen.width) : (x += 1) {
+                const v: u32 = @intCast((x ^ y) & 0xFF);
+                framebuffer.putpixel(screen, x, y, (v << 16) | (v << 8) | v);
+            }
+        }
+        serial.write("drew to the framebuffer\r\n");
+    } else {
+        serial.write("limine was a piece of shit.\r\n");
+    }
+
     while (true) asm volatile ("hlt");
 }