Added libgui

1 files changed, 42 insertions, 0 deletions

diff --git a/libgui/vesa.c b/libgui/vesa.c
new file mode 100644
index 0000000..2d3e107
--- /dev/null
+++ b/libgui/vesa.c
@@ -0,0 +1,42 @@
+// MIT License, Copyright (c) 2020 Marvin Borner
+
+#include <def.h>
+#include <vesa.h>
+
+void vesa_draw_rectangle(int x1, int y1, int x2, int y2, const u32 color[3])
+{
+	int pos1 = x1 * vbe_bpl + y1 * vbe_pitch;
+	u8 *draw = &fb[pos1];
+	for (int i = 0; i <= y2 - y1; i++) {
+		for (int j = 0; j <= x2 - x1; j++) {
+			draw[vbe_bpl * j] = color[2];
+			draw[vbe_bpl * j + 1] = color[1];
+			draw[vbe_bpl * j + 2] = color[0];
+		}
+		draw += vbe_pitch;
+	}
+}
+
+void vesa_set_pixel(u16 x, u16 y, const u32 color[3])
+{
+	u8 pos = x * vbe_bpl + y * vbe_pitch;
+	u8 *draw = &fb[pos];
+	draw[pos] = (char)color[2];
+	draw[pos + 1] = (char)color[1];
+	draw[pos + 2] = (char)color[0];
+}
+
+void vesa_fill(const u32 color[3])
+{
+	vesa_draw_rectangle(0, 0, vbe->width - 1, vbe->height - 1, color);
+}
+
+void vesa_init(struct vbe *info)
+{
+	vbe = info;
+	vbe_height = vbe->height;
+	vbe_width = vbe->width;
+	vbe_bpl = vbe->bpp >> 3;
+	vbe_pitch = vbe->pitch;
+	fb = (u8 *)vbe->framebuffer;
+}