From 293c0efbc0051876b3b75a41d4df7c9c992d30bc Mon Sep 17 00:00:00 2001
From: Atreya Bain <atreyabain@gmail.com>
Date: Sun, 3 Mar 2024 13:02:45 +0530
Subject: [PATCH] [draw] Add draw calls

---
 src/device/device.rs | 8 ++++----
 src/main.rs          | 4 ++--
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/device/device.rs b/src/device/device.rs
index ed70d24..48aea57 100644
--- a/src/device/device.rs
+++ b/src/device/device.rs
@@ -102,17 +102,17 @@ impl Device {
 
                 for i in 0..n as usize{
                     let index = Self::get_framebuffer_index(x,y+i);
-                    let slice_from_memory = self.memory[self.registers.i as usize];
+                    let slice_from_memory = self.memory[self.registers.i as usize + i];
 
                     for bit_index in (0..8).rev() {
                         // if i'm going to the next line, stop
                         if Self::get_framebuffer_index(0, y+1)==index {
                             break;
                         }
-                        let bit = (slice_from_memory & 1<<bit_index) >> bit_index;
+                        let bit = (slice_from_memory & (1<<bit_index)) >> bit_index;
 
-
-                        frame_buffer[index+(7-bit_index)] = frame_buffer[index+(7-bit_index)] ^ (bit * 0xff);
+                        let byte = bit * 0xff;
+                        frame_buffer[index+(7-bit_index)] = frame_buffer[index+(7-bit_index)] ^ (byte);
                     }
                 }
                 // TODO fix carry bit
diff --git a/src/main.rs b/src/main.rs
index 660bb1a..6474f9f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -100,7 +100,7 @@ fn main() {
 fn draw_screen(frame_buffer: MutexGuard<Box<[u8; 2048]>>, window_canvas: &mut WindowCanvas, x1: &mut Vec<u8>) {
     for (i,pixel) in frame_buffer.iter().enumerate(){
         x1[3*i] = *pixel;
-        x1[3*i+1] = *pixel;
+        x1[3*i+1] = *pixel ;
         x1[3*i+2] = *pixel;
     }
     drop(frame_buffer);
@@ -110,7 +110,7 @@ fn draw_screen(frame_buffer: MutexGuard<Box<[u8; 2048]>>, window_canvas: &mut Wi
     tex.with_lock(None,|u,i|{
         u.copy_from_slice(x1);
     }).expect("Unwrap tex");
-    window_canvas.copy(&tex,None,None);
+    window_canvas.copy(&tex,None,None).expect("Failed to set texture");
 }
 
 fn get_frame_buffer() -> Arc<Mutex<Box<[u8; 2048]>>> {