From 0fbb5aae07bbaf316bf114d72d28ffc2a9a19d8e Mon Sep 17 00:00:00 2001
From: Tom-on64 <kubecekt@gmail.com>
Date: Thu, 2 May 2024 14:41:12 +0200
Subject: [PATCH] ADDED SCROLLING!!!!!\n(It's so fucking slow)

---
 Makefile         |  6 +++---
 include/screen.h | 30 ++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index 7b29bdc..8ce2faf 100644
--- a/Makefile
+++ b/Makefile
@@ -17,7 +17,7 @@ os: $(BUILD) filesystem
 	@echo "\nDone!\n"
 
 # Filesystem
-filesystem: $(BUILD)/boot.bin $(BUILD)/kernel.bin $(C_FILES) $(FONTS)
+filesystem: bootloader kernel $(C_FILES) $(FONTS)
 	@echo "Building filesystem..."
 	@$(AS) -fbin -o $(BUILD)/filetable.bin $(SRC)/filetable.asm
 	@dd if=/dev/zero of=kern.iso bs=512 count=2880 status=none
@@ -35,7 +35,7 @@ $(BUILD):
 	@rm -rf $(BUILD)/*
 
 # Bootloader: This target is responsible for creating boot.bin
-$(BUILD)/boot.bin: $(SRC)/stage1.asm $(SRC)/stage2.asm
+bootloader: $(SRC)/stage1.asm $(SRC)/stage2.asm
 	@echo "Assembling $(SRC)/stage1.asm..."
 	@$(AS) -fbin -o $(BUILD)/stage1.bin $(SRC)/stage1.asm
 	@echo "Assembling $(SRC)/stage2.asm..."
@@ -43,7 +43,7 @@ $(BUILD)/boot.bin: $(SRC)/stage1.asm $(SRC)/stage2.asm
 	@cat $(BUILD)/stage1.bin $(BUILD)/stage2.bin > $(BUILD)/boot.bin
 
 # Kernel: This target is responsible for creating kernel.bin
-$(BUILD)/kernel.bin: $(SRC)/kernel.c $(SRC)/entry.asm
+kernel: $(SRC)/kernel.c $(SRC)/entry.asm
 	@echo "Assembling $(SRC)/entry.asm..."
 	@$(AS) -felf32 -o $(BUILD)/entry.o $(SRC)/entry.asm
 	@echo "Compiling $(SRC)/kernel.c..."
diff --git a/include/screen.h b/include/screen.h
index 0bb4c90..4589c42 100644
--- a/include/screen.h
+++ b/include/screen.h
@@ -2,6 +2,7 @@
 #define SCREEN_H
 
 #include "stdint.h"
+#include "string.h"
 
 #define MODE_INFO_BLOCK 0x9000
 #define BG_COLOR 0x00010b17
@@ -123,6 +124,33 @@ void printAt(const char* str, uint32_t x, uint32_t y) {
     }
 }
 
+void scroll() { // TODO: Make this fast (same as everything else, it's extremely slow)
+    uint8_t charHeight = *(font + 1);
+    if ((cursor.y+1) * charHeight < gfxMode->yRes) { return; } // Check if we should scroll
+
+    uint32_t bytesPerLine = charHeight * gfxMode->bytesPerScanline;
+    uint32_t lines = gfxMode->yRes / charHeight;
+    uint32_t vidmem = gfxMode->physicalBasePtr;
+
+    for (uint32_t i = 1; i < lines; i++) {
+        uint32_t address = vidmem + i * bytesPerLine;
+        memcopy((char*)address, (char*)(address - bytesPerLine), bytesPerLine);
+    }
+    
+    uint32_t color = convertColor(bgColor);
+    uint8_t* lastLine = (uint8_t*)(vidmem + (lines-1) * bytesPerLine);
+    uint8_t bytesPerPx = (gfxMode->bpp+1) / 8;
+    
+    for (uint32_t i = 0; i < bytesPerLine; i++) {
+        for (uint8_t j = 0; j < bytesPerPx; j++) {
+            lastLine[j] = (uint8_t)(color >> (j * 8));
+        }
+        lastLine += bytesPerPx;
+    }
+
+    cursor.y--;
+}
+
 void putc(char c) {
     uint8_t charWidth = *(font);
 
@@ -150,6 +178,8 @@ void putc(char c) {
             cursor.x = 0;
         }
     }
+
+    scroll();
 }
 
 void print(const char* str) {