Getting started with print on display + some fixes

5 files changed, 193 insertions, 0 deletions

diff --git a/arch/x86/io/GlobalObj.cpp b/arch/x86/io/GlobalObj.cpp
new file mode 100644
index 0000000..a1c4f03
--- /dev/null
+++ b/arch/x86/io/GlobalObj.cpp
@@ -0,0 +1,3 @@
+#include "VGADisplay.h"
+
+VGADisplay display;
diff --git a/arch/x86/io/GlobalObj.h b/arch/x86/io/GlobalObj.h
new file mode 100644
index 0000000..72c6b06
--- /dev/null
+++ b/arch/x86/io/GlobalObj.h
@@ -0,0 +1,8 @@
+#ifndef GLOBALOBJ_H
+#define GLOBALOBJ_H
+
+#include "VGADisplay.h"
+
+extern VGADisplay display;
+
+#endif
diff --git a/arch/x86/io/VGADisplay.cpp b/arch/x86/io/VGADisplay.cpp
new file mode 100644
index 0000000..b74858b
--- /dev/null
+++ b/arch/x86/io/VGADisplay.cpp
@@ -0,0 +1,119 @@
+#include "VGADisplay.h"
+
+VGADisplay::VGADisplay()
+{
+    isBright = isBlink = shift = 0;
+    xCurr = yCurr = 0;
+    color = (char)VGADisplayInfo::colorAttr::gray;
+    videoMem = (dchar *)VGADisplayInfo::videoMemAddr;
+};
+
+VGADisplay::VGADisplay(uint16 x, uint16 y)
+{
+    isBright = isBlink = shift = 0;
+    xCurr = yCurr = 0;
+    color = (char)VGADisplayInfo::colorAttr::gray;
+    videoMem = (dchar *)VGADisplayInfo::videoMemAddr;
+};
+
+VGADisplay& VGADisplay::operator<<(const char &c)
+{
+    printChar(c);
+
+    return *this;
+};
+
+VGADisplay& VGADisplay::operator++(int)
+{
+    if(++xCurr == VGADisplayInfo::width)
+    {
+        yCurr++; 
+        xCurr = 0; 
+    }
+    if(yCurr == VGADisplayInfo::height)
+    {
+        if(shift)
+        { 
+            this->doShift(); 
+            xCurr = 0; 
+            yCurr--;
+        }
+        else xCurr = 0, yCurr = 0;
+    }
+    videoMem = (dchar *)(VGADisplayInfo::videoMemAddr) 
+                + yCurr * VGADisplayInfo::width + xCurr;
+
+    return *this;
+};
+
+VGADisplay& VGADisplay::operator<<(const char *c)
+{
+    for(int i = 0; c[i] != '\0'; i++)
+    {
+        (*this) << c[i];
+    }
+
+    return *this;
+};
+
+void VGADisplay::doShift()
+{
+    for(uint16 i = 0; i < VGADisplayInfo::height; i++)
+    {
+        for(uint16 j = 0; j < VGADisplayInfo::width; j++)
+        {
+            *((dchar *)(VGADisplayInfo::videoMemAddr) + (i - 1) * VGADisplayInfo::width + j) = *((dchar *)(VGADisplayInfo::videoMemAddr) + i * VGADisplayInfo::width + j);
+            *((dchar *)(VGADisplayInfo::videoMemAddr) + i * VGADisplayInfo::width + j) = (*((dchar *)(VGADisplayInfo::videoMemAddr) + i * VGADisplayInfo::width + j) & 0x00) | ' ';
+        }
+    }
+};
+
+void VGADisplay::setShift(bool status)
+{
+    shift = status;
+};
+
+void VGADisplay::setColor(char colorAttr)
+{
+    color = colorAttr;
+}; 
+
+void VGADisplay::setBlink(bool blinkAttr)
+{
+    isBlink = blinkAttr;
+};
+
+void VGADisplay::setBright(bool brigthAttr)
+{
+    isBright = brigthAttr;
+};
+
+void VGADisplay::goNewLine()
+{
+    uint16 yCurrOld = yCurr;
+
+    while(yCurrOld == yCurr) (*this)++;
+};
+
+void VGADisplay::goHorizontalTab()
+{
+    while(xCurr % 8 != 0) (*this)++;
+};
+
+bool VGADisplay::printChar(const char &c)
+{
+    switch(c)
+    {
+        case '\0': return true;
+        case '\n': this->goNewLine(); return true;
+        case '\t': this->goHorizontalTab(); return true;
+        default:
+                   {
+                        char attr = isBlink << 8 | isBright << 4
+                                                 | color;
+                        *videoMem = c | attr << 8; 
+                        (*this)++;
+                        return false;
+                   }
+    }
+};
diff --git a/arch/x86/io/VGADisplay.h b/arch/x86/io/VGADisplay.h
new file mode 100644
index 0000000..67f28b3
--- /dev/null
+++ b/arch/x86/io/VGADisplay.h
@@ -0,0 +1,36 @@
+#ifndef VGAGRAPHICS_H
+#define VGAGRAPHICS_H
+
+#include "VGADisplayInfo.h"
+
+typedef unsigned short dchar;
+
+class VGADisplay
+{
+    private:
+        uint16 xCurr;
+        uint16 yCurr;
+        dchar *videoMem;
+        bool shift;
+        char color;
+        bool isBlink;
+        bool isBright;
+
+        void doShift();
+        // 0 if passed char isn't escape sequence, else 1
+        bool printChar(const char &c);
+        void goNewLine();
+        void goHorizontalTab();
+
+    public:
+        VGADisplay();
+        VGADisplay(uint16 x, uint16 y);
+        VGADisplay& operator<<(const char &c);
+        VGADisplay& operator<<(const char *c);
+        VGADisplay& operator++(int);
+        void setShift(bool status);
+        void setColor(char colorAttr);
+        void setBlink(bool blinkAttr);
+        void setBright(bool brigthAttr);
+};
+#endif
diff --git a/arch/x86/io/VGADisplayInfo.h b/arch/x86/io/VGADisplayInfo.h
new file mode 100644
index 0000000..33235cc
--- /dev/null
+++ b/arch/x86/io/VGADisplayInfo.h
@@ -0,0 +1,27 @@
+#ifndef VGAINFOCLASS_H
+#define VGAINFOCLASS_H
+
+#include "../inc/types.h"
+
+#define TOBG(attr) attr << 4
+
+class VGADisplayInfo
+{
+    public:
+        const static uint32 videoMemAddr = 0xB8000;
+        const static uint16 width = 80;
+        const static uint16 height = 25;
+        const static uint16 tabSize = 8;
+        enum class colorAttr {
+            black = 0,
+            blue = 1,
+            green = 2,
+            cyan = 3,
+            red = 4,
+            magenta = 5,
+            brown = 6,
+            gray = 7
+        };
+};
+
+#endif