From e7d88df7a5a7e11677b68303a0d05455bf9a60d6 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Wed, 11 Dec 2019 21:22:15 +0100
Subject: Some user-side graphics

---
 src/userspace/graphics/framebuffer.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 src/userspace/graphics/framebuffer.c

(limited to 'src/userspace/graphics/framebuffer.c')

diff --git a/src/userspace/graphics/framebuffer.c b/src/userspace/graphics/framebuffer.c
new file mode 100644
index 0000000..f7b793b
--- /dev/null
+++ b/src/userspace/graphics/framebuffer.c
@@ -0,0 +1,34 @@
+#include <syscall.h>
+#include <graphics/graphics.h>
+
+unsigned char *fb;
+int vbe_bpl = 3;
+int vbe_pitch = 3000;
+int vbe_height = 1080;
+int vbe_width = 2560;
+
+void vesa_draw_rectangle(int x1, int y1, int x2, int y2, const uint32_t color[3])
+{
+    int pos1 = x1 * vbe_bpl + y1 * vbe_pitch;
+    char *draw = (char *) &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_clear()
+{
+    vesa_draw_rectangle(0, 0, vbe_width - 1, vbe_height - 1, 0);
+}
+
+void init_framebuffer()
+{
+    struct userspace_pointers *pointers = (struct userspace_pointers *) syscall_get_pointers();
+    fb = pointers->fb;
+    vesa_clear();
+}
\ No newline at end of file
-- 
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