From aec1686102abc5c9099c198e7798bcb7c94b3402 Mon Sep 17 00:00:00 2001
From: Tianhao Wang <shrik3@riseup.net>
Date: Sat, 11 Mar 2023 01:35:16 +0100
Subject: adding io port

---
 src/machine/cgascr.rs | 44 +++++++++++++++++++++++++++++++-------------
 1 file changed, 31 insertions(+), 13 deletions(-)

(limited to 'src/machine')

diff --git a/src/machine/cgascr.rs b/src/machine/cgascr.rs
index f67501c..091c50d 100644
--- a/src/machine/cgascr.rs
+++ b/src/machine/cgascr.rs
@@ -8,29 +8,47 @@ pub struct CGAScreen{
 
 #[allow(dead_code)]
 impl CGAScreen{
-    pub fn new(cows:u32, rows:u32) -> Self {
-        Self {max_cows: cows, max_rows:rows,}
+    pub fn new(rows:u32, cols:u32) -> Self {
+        Self {max_rows:rows, max_cows:cols}
+    }
+
+   
+    fn get_index(&self,row:u32, col:u32) -> u32{
+        col + row*self.max_cows
     }
 
-    
     // this function should be the only one that "directly touches"
     // the memory by address. 
     // and since it's unsafe, it shouldn't be public
-    //
-    // fn show(&self, x:u32, y:u32, c:char, attr:u8){
-    //
-    // }
+    pub fn show(&self, row:u32, col:u32, c:char, attr:u8){
+        let index = self.get_index(row, col);
+
+        unsafe{
+            *vga_buffer.offset(index as isize * 2) = c as u8;
+            *vga_buffer.offset(index as isize * 2 + 1) = attr;
+        }
+
+    }
+
+    pub fn putchar(&self, ch:char){
+         
+    }
+    
+    pub fn setpos(){}
+    pub fn getpos(){}
+     
+
+    // Sanity Check of the cgascreen
     pub fn test(&self){
         let mut r = 0;
         let mut c = 0;
-
+    
+        let mut counter = 0;
         while r<self.max_rows {
             while c<self.max_cows {
-                let index:u32 = r*self.max_cows + c;
-                unsafe {
-                    *vga_buffer.offset(index as isize * 2) = index as u8;
-                    *vga_buffer.offset(index as isize * 2 + 1) = index as u8;
-                }
+                let ch = (counter & 0xff) as u8;
+                self.show(r,c,ch as char, ch);
+                counter += 1;
                 c+=1;
             }
             r+=1;
-- 
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