From 9dc527b3be9d493dcf8cf1baf78477373eb5990d Mon Sep 17 00:00:00 2001
From: Loic Guegan <manzerbredes@mailbox.org>
Date: Mon, 26 Apr 2021 12:37:34 +0200
Subject: Enable psf font for framebuffer display

---
 src/drivers/vga_t.cc | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 src/drivers/vga_t.cc

(limited to 'src/drivers/vga_t.cc')

diff --git a/src/drivers/vga_t.cc b/src/drivers/vga_t.cc
new file mode 100644
index 0000000..6e50b40
--- /dev/null
+++ b/src/drivers/vga_t.cc
@@ -0,0 +1,58 @@
+#include "vga_t.hpp"
+
+#define MAX_COL 80
+#define MAX_LINE 25
+
+VIDEO_STATE VS={
+  (u8 *)0xB8000,
+  0,
+  0,
+  BLACK,
+  GRAY,
+};
+
+void vga_t_putchar(char c){
+  // Handle newline here
+  if(c=='\n'){
+    VS.col=0;
+    VS.line+=1;
+    if(VS.line>=MAX_LINE){
+      VS.line=MAX_LINE-1;
+      vga_t_scrollup();
+    }
+    return;
+  }
+  
+  // Print char
+  VS.mem[VS.col*2+MAX_COL*VS.line*2]=c;
+  VS.mem[VS.col*2+MAX_COL*VS.line*2+1]=VS.fg|VS.bg<<4;
+  
+  // Refresh location
+  VS.col+=1;
+  if(VS.col>= MAX_COL){
+    VS.col=0;
+    VS.line+=1;
+    if(VS.line>=MAX_LINE){
+      VS.line=MAX_LINE-1;
+      vga_t_scrollup();
+    }
+  }
+}
+
+void clear(){
+  for(u8 i=0;i<MAX_LINE;i++){
+    vga_t_scrollup();
+  }
+}
+
+void vga_t_scrollup(){
+  // Move VS.line up
+  for(u8 i=1;i<=MAX_LINE;i++){
+    for(u8 j=0;j<=MAX_COL;j++)
+      VS.mem[j*2+MAX_COL*(i-1)*2]=VS.mem[j*2+MAX_COL*i*2];
+  }
+  // Clear last VS.line
+  for(u8 i=0;i<=MAX_COL;i++){
+    VS.mem[i*2+MAX_COL*(MAX_LINE-1)*2]='\0';
+  }
+}
-- 
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