diff --git a/assets/.gitattributes b/assets/.gitattributes
new file mode 100644
index 000000000..ca82ef549
--- /dev/null
+++ b/assets/.gitattributes
@@ -0,0 +1 @@
+*.{psd,tga,ogg} filter=lfs diff=lfs merge=lfs -text
\ No newline at end of file
diff --git a/assets/test.frag b/assets/test.frag
new file mode 100644
index 000000000..0a7045b79
--- /dev/null
+++ b/assets/test.frag
@@ -0,0 +1,16 @@
+#ifdef GL_ES
+    precision mediump float;
+#endif
+
+varying vec4 v_color;
+varying vec2 v_texCoords;
+uniform sampler2D u_texture;
+uniform mat4 u_projTrans;
+
+void main() {
+        vec3 color = texture2D(u_texture, v_texCoords).rgb;
+        float gray = (3.0 * color.r + 4.0 * color.g + color.b) / 8.0;
+        vec3 grayscale = vec3(gray);
+
+        gl_FragColor = vec4(grayscale, 1.0);
+}
\ No newline at end of file
diff --git a/assets/test.vert b/assets/test.vert
new file mode 100644
index 000000000..17d96ca8d
--- /dev/null
+++ b/assets/test.vert
@@ -0,0 +1,14 @@
+attribute vec4 a_position;
+attribute vec4 a_color;
+attribute vec2 a_texCoord0;
+
+uniform mat4 u_projTrans;
+
+varying vec4 v_color;
+varying vec2 v_texCoords;
+
+void main() {
+    v_color = a_color;
+    v_texCoords = a_texCoord0;
+    gl_Position = u_projTrans * a_position;
+}
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/StateInGame.kt b/src/net/torvald/terrarum/StateInGame.kt
index 75ebdfaf3..0426c8f03 100644
--- a/src/net/torvald/terrarum/StateInGame.kt
+++ b/src/net/torvald/terrarum/StateInGame.kt
@@ -798,6 +798,3 @@ constructor() : BasicGameState() {
         }
     }
 }
-
-fun Color.toInt() = redByte.shl(16) or greenByte.shl(8) or blueByte
-fun Color.to10bit() = redByte.shl(20) or greenByte.shl(10) or blueByte
diff --git a/src/net/torvald/terrarum/StateShaderTest.kt b/src/net/torvald/terrarum/StateShaderTest.kt
new file mode 100644
index 000000000..72aa635ab
--- /dev/null
+++ b/src/net/torvald/terrarum/StateShaderTest.kt
@@ -0,0 +1,100 @@
+package net.torvald.terrarum
+
+import net.torvald.terrarum.Terrarum.Companion.STATE_ID_TEST_SHADER
+import org.lwjgl.opengl.*
+import org.newdawn.slick.GameContainer
+import org.newdawn.slick.Graphics
+import org.newdawn.slick.Image
+import org.newdawn.slick.opengl.renderer.SGL
+import org.newdawn.slick.state.BasicGameState
+import org.newdawn.slick.state.StateBasedGame
+import shader.Shader
+import org.lwjgl.opengl.GL11
+import org.lwjgl.opengl.ARBShaderObjects
+import com.sun.xml.internal.ws.streaming.XMLStreamReaderUtil.close
+import jdk.nashorn.internal.runtime.ScriptingFunctions.readLine
+import net.torvald.terrarum.gameworld.fmod
+import org.newdawn.slick.Color
+import org.newdawn.slick.opengl.TextureImpl
+import java.io.InputStreamReader
+import java.io.BufferedReader
+import java.io.File
+import java.io.FileInputStream
+
+
+
+
+
+
+
+/**
+ * Created by SKYHi14 on 2017-01-23.
+ */
+class StateShaderTest : BasicGameState() {
+    override fun getID() = STATE_ID_TEST_SHADER
+
+
+
+    override fun init(container: GameContainer?, game: StateBasedGame?) {
+    }
+
+    private lateinit var shaderTest: Shader
+    private lateinit var testImage: Image
+
+    override fun enter(container: GameContainer?, game: StateBasedGame?) {
+        shaderTest = Shader.makeShader("./assets/test.vert", "./assets/test.frag")
+
+        testImage = Image("./assets/test_texture.tga")
+        //testImage = Image("./logo_repository.png")
+    }
+
+    override fun update(container: GameContainer?, game: StateBasedGame?, delta: Int) {
+        Terrarum.appgc.setTitle("${Terrarum.NAME} — F: ${Terrarum.appgc.fps}")
+    }
+
+    override fun render(container: GameContainer?, game: StateBasedGame?, g: Graphics?) {
+        val x = 10f
+        val y = 10f
+        val width = testImage.width
+        val height = testImage.height
+        val textureWidth = testImage.textureWidth
+        val textureHeight = testImage.textureHeight
+        val textureOffsetX = testImage.textureOffsetX
+        val textureOffsetY = testImage.textureOffsetY
+
+
+        GL11.glClear(GL11.GL_COLOR_BUFFER_BIT)
+        // bind texture
+        // glBegin(SGL.GL_QUADS)
+        // do shader
+        // glEnd()
+
+
+
+        //testImage.bind()
+
+        GL11.glBegin(GL11.GL_QUADS)
+
+        //GL20.glUseProgram(0)
+        shaderTest.startShader()
+        //GL13.glActiveTexture(testImage.texture.textureID)
+        //GL11.glBindTexture(GL13.GL_TEXTURE0, testImage.texture.textureID)
+        //testImage.bind()
+        shaderTest.setUniformIntVariable("u_texture", 0)
+
+        /*GL11.glTexCoord2f(textureOffsetX, textureOffsetY)
+        GL11.glVertex3f(x, y, 0f)
+        GL11.glTexCoord2f(textureOffsetX, textureOffsetY + textureHeight)
+        GL11.glVertex3f(x, y + height, 0f)
+        GL11.glTexCoord2f(textureOffsetX + textureWidth, textureOffsetY + textureHeight)
+        GL11.glVertex3f(x + width, y + height, 0f)
+        GL11.glTexCoord2f(textureOffsetX + textureWidth, textureOffsetY)
+        GL11.glVertex3f(x + width, y, 0f)*/
+
+        g!!.color = Color.orange
+        g!!.fillRect(10f, 10f, 512f, 512f)
+
+        GL20.glUseProgram(0)
+        GL11.glEnd()
+    }
+}
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/StateVTTest.kt b/src/net/torvald/terrarum/StateVTTest.kt
index fe7e25a49..e4f88ebd7 100644
--- a/src/net/torvald/terrarum/StateVTTest.kt
+++ b/src/net/torvald/terrarum/StateVTTest.kt
@@ -21,8 +21,8 @@ class StateVTTest : BasicGameState() {
 
     // HiRes: 100x64, LoRes: 80x25
     val computerInside = BaseTerrarumComputer(8)
-    val vt = SimpleTextTerminal(SimpleTextTerminal.WHITE, 80, 25,
-            computerInside, colour = true, hires = false)
+    val vt = SimpleTextTerminal(SimpleTextTerminal.AMETHYST_NOVELTY, 80, 25,
+            computerInside, colour = false, hires = false)
 
 
     val vtUI = Image(vt.displayW, vt.displayH)
@@ -56,31 +56,6 @@ class StateVTTest : BasicGameState() {
 
         blendNormal()
         g.drawImage(vtUI, vtUIrenderX, vtUIrenderY)
-
-
-        // cursor
-        if (vt.cursorBlinkOn) {
-            g.color = vt.getColor(if (vt.cursorBlink) vt.foreDefault else vt.backDefault)
-
-            g.fillRect(
-                    vt.fontW * vt.cursorX.toFloat() + vt.borderSize + vtUIrenderX,
-                    vt.fontH * vt.cursorY.toFloat() + vt.borderSize + vtUIrenderY,
-                    vt.fontW.toFloat(),
-                    vt.fontH.toFloat()
-            )
-        }
-
-
-        // not-pure-black screen
-        /*g.color = vt.colourScreen
-        blendScreen()
-        g.fillRect(vtUIrenderX, vtUIrenderY, vt.displayW.toFloat(), vt.displayH.toFloat())
-
-
-        // colour overlay
-        g.color = vt.phosphor
-        blendMul()
-        g.fillRect(vtUIrenderX, vtUIrenderY, vt.displayW.toFloat(), vt.displayH.toFloat())*/
     }
 
     override fun keyPressed(key: Int, c: Char) {
diff --git a/src/net/torvald/terrarum/Terrarum.kt b/src/net/torvald/terrarum/Terrarum.kt
index f582b670a..f4e360105 100644
--- a/src/net/torvald/terrarum/Terrarum.kt
+++ b/src/net/torvald/terrarum/Terrarum.kt
@@ -132,6 +132,7 @@ constructor(gamename: String) : StateBasedGame(gamename) {
         //addState(StateFontTester())
         //addState(StateNoiseTexGen())
         //addState(StateBlurTest())
+        //addState(StateShaderTest())
 
         ingame = StateInGame()
         addState(ingame)
@@ -241,6 +242,7 @@ constructor(gamename: String) : StateBasedGame(gamename) {
         val STATE_ID_TEST_LIGHTNING_GFX = 0x101
         val STATE_ID_TEST_TTY = 0x102
         val STATE_ID_TEST_BLUR = 0x103
+        val STATE_ID_TEST_SHADER = 0x104
 
         val STATE_ID_TOOL_NOISEGEN = 0x200
 
@@ -538,4 +540,21 @@ fun Image.getPixel(x: Int, y: Int): IntArray {
                 else 255
         )
     }
-}
\ No newline at end of file
+}
+
+fun Color.toInt() = redByte.shl(16) or greenByte.shl(8) or blueByte
+fun Color.to10bit() = redByte.shl(20) or greenByte.shl(10) or blueByte
+
+infix fun Color.screen(other: Color) = Color(
+        1f - (1f - this.r) * (1f - other.r),
+        1f - (1f - this.g) * (1f - other.g),
+        1f - (1f - this.b) * (1f - other.b),
+        1f - (1f - this.a) * (1f - other.a)
+)
+
+infix fun Color.mul(other: Color) = Color(
+        this.r * other.r,
+        this.g * other.g,
+        this.b * other.b,
+        this.a * other.a
+)
diff --git a/src/net/torvald/terrarum/virtualcomputer/assets/lua/TBASEXEC.lua b/src/net/torvald/terrarum/virtualcomputer/assets/lua/TBASEXEC.lua
index 046465768..b4e18b7f2 100644
--- a/src/net/torvald/terrarum/virtualcomputer/assets/lua/TBASEXEC.lua
+++ b/src/net/torvald/terrarum/virtualcomputer/assets/lua/TBASEXEC.lua
@@ -480,10 +480,6 @@ end
 
 -- END OF LEXER ---------------------------------------------------------------
 
-local testprogram = [[
-10 PRINT "Hello, world!"
-]]
-
 
 _G._TBASIC.EXEC = function(cmdstring) -- you can access this interpreter with this global function
 	_TBASIC._INTPRTR.RESET()
diff --git a/src/net/torvald/terrarum/virtualcomputer/terminal/SimpleTextTerminal.kt b/src/net/torvald/terrarum/virtualcomputer/terminal/SimpleTextTerminal.kt
index 369093cbe..1190708af 100644
--- a/src/net/torvald/terrarum/virtualcomputer/terminal/SimpleTextTerminal.kt
+++ b/src/net/torvald/terrarum/virtualcomputer/terminal/SimpleTextTerminal.kt
@@ -2,9 +2,7 @@ package net.torvald.terrarum.virtualcomputer.terminal
 
 import net.torvald.aa.AAFrame
 import net.torvald.aa.ColouredFastFont
-import net.torvald.terrarum.blendNormal
-import net.torvald.terrarum.blendMul
-import net.torvald.terrarum.blendScreen
+import net.torvald.terrarum.*
 import net.torvald.terrarum.gameactors.abs
 import net.torvald.terrarum.virtualcomputer.computer.BaseTerrarumComputer
 import org.lwjgl.BufferUtils
@@ -178,13 +176,11 @@ open class SimpleTextTerminal(
                 }
             }
 
-            redrawSemaphore = false
         }
 
-
         // cursor
-        /*if (cursorBlinkOn) {
-            g.color = getColor(if (cursorBlink) foreDefault else backDefault)
+        if (cursorBlinkOn) {
+            g.color = getColor(if (cursorBlink) foreDefault else backDefault) screen colourScreen mul phosphor
 
             g.fillRect(
                     fontW * cursorX.toFloat() + borderSize,
@@ -192,8 +188,40 @@ open class SimpleTextTerminal(
                     fontW.toFloat(),
                     fontH.toFloat()
             )
-        }*/
+        }
+        else {
+            val x = cursorX
+            val y = cursorY
+            val ch = screenBuffer.getChar(x, y)
 
+            // background
+            g.color = getColor(screenBuffer.getBackgroundColour(x, y)) screen colourScreen mul phosphor
+            g.fillRect(fontW * x.toFloat() + borderSize, fontH * y.toFloat() + borderSize,
+                    fontW.toFloat(), fontH.toFloat())
+
+            // foreground
+            if (ch.toInt() != 0 && ch.toInt() != 32) {
+                g.color = getColor(screenBuffer.getForegroundColour(x, y)) screen colourScreen mul phosphor
+                g.drawString(
+                        Character.toString(ch),
+                        fontW * x.toFloat() + borderSize, fontH * y.toFloat() + borderSize)
+            }
+        }
+
+        if (redrawSemaphore) {
+            // colour base
+            g.color = colourScreen
+            blendScreen()
+            g.fillRect(0f, 0f, fontW * width.toFloat() + 2 * borderSize, fontH * height.toFloat() + 2 * borderSize)
+
+            // colour overlay
+            g.color = phosphor
+            blendMul()
+            g.fillRect(0f, 0f, fontW * width.toFloat() + 2 * borderSize, fontH * height.toFloat() + 2 * borderSize)
+
+
+            redrawSemaphore = false
+        }
 
         blendNormal()