diff --git a/src/js/buffer/buffer_manager.js b/src/js/buffer/buffer_manager.js
index 09fbadf..b9cbfc8 100644
--- a/src/js/buffer/buffer_manager.js
+++ b/src/js/buffer/buffer_manager.js
@@ -149,7 +149,7 @@ export default ShaderBoy.bufferManager = {
             this.compileShaders()
         }
 
-        ShaderBoy.forceDraw = (ShaderBoy.isPlaying !== true)
+        ShaderBoy.forceDraw = !ShaderBoy.isPlaying
     },
 
     //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/src/js/commands.js b/src/js/commands.js
index 6691878..7ffc390 100644
--- a/src/js/commands.js
+++ b/src/js/commands.js
@@ -142,7 +142,7 @@ export default ShaderBoy.commands = {
     {
         ShaderBoy.renderScale = 1
         ShaderBoy.bufferManager.setFBOsProps()
-        if (ShaderBoy.isPlaying !== true) ShaderBoy.forceDraw = true
+        ShaderBoy.forceDraw = !ShaderBoy.isPlaying
     },
 
     //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -150,7 +150,7 @@ export default ShaderBoy.commands = {
     {
         ShaderBoy.renderScale = 2
         ShaderBoy.bufferManager.setFBOsProps()
-        if (ShaderBoy.isPlaying !== true) ShaderBoy.forceDraw = true
+        ShaderBoy.forceDraw = !ShaderBoy.isPlaying
     },
 
     //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -158,7 +158,7 @@ export default ShaderBoy.commands = {
     {
         ShaderBoy.renderScale = 3
         ShaderBoy.bufferManager.setFBOsProps()
-        if (ShaderBoy.isPlaying !== true) ShaderBoy.forceDraw = true
+        ShaderBoy.forceDraw = !ShaderBoy.isPlaying
     },
 
     //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -166,7 +166,7 @@ export default ShaderBoy.commands = {
     {
         ShaderBoy.renderScale = 4
         ShaderBoy.bufferManager.setFBOsProps()
-        if (ShaderBoy.isPlaying !== true) ShaderBoy.forceDraw = true
+        ShaderBoy.forceDraw = !ShaderBoy.isPlaying
     },
 
     //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/src/js/gui/gui.js b/src/js/gui/gui.js
index b3fffa3..439c488 100644
--- a/src/js/gui/gui.js
+++ b/src/js/gui/gui.js
@@ -107,7 +107,7 @@ export default ShaderBoy.gui = {
 				gui.mousePosX = gui.mouseOriX
 				gui.mousePosY = gui.mouseOriY
 				ShaderBoy.uniforms.iMouse = [gui.mousePosX, gui.mousePosY, gui.mouseOriX, gui.mouseOriY]
-				if (ShaderBoy.isPlaying !== true) ShaderBoy.forceDraw = true
+				ShaderBoy.forceDraw = !ShaderBoy.isPlaying
 			}
 		}
 
@@ -119,7 +119,7 @@ export default ShaderBoy.gui = {
 				gui.mouseOriX=Math.abs(gui.mouseOriX)*-1
 				gui.mouseOriY=Math.abs(gui.mouseOriY)*-1
 				ShaderBoy.uniforms.iMouse = [gui.mousePosX, gui.mousePosY, gui.mouseOriX, gui.mouseOriY]
-				if (ShaderBoy.isPlaying !== true) ShaderBoy.forceDraw = true
+				ShaderBoy.forceDraw = !ShaderBoy.isPlaying
 			}
 		}
 
@@ -134,7 +134,7 @@ export default ShaderBoy.gui = {
 					gui.mouseOriX=Math.abs(gui.mouseOriX)
 					gui.mouseOriY=Math.abs(gui.mouseOriY)*-1
 					ShaderBoy.uniforms.iMouse = [gui.mousePosX, gui.mousePosY, gui.mouseOriX, gui.mouseOriY]
-					if (ShaderBoy.isPlaying !== true) ShaderBoy.forceDraw = true
+					ShaderBoy.forceDraw = !ShaderBoy.isPlaying
 				}
 			}
 		}
@@ -170,7 +170,7 @@ export default ShaderBoy.gui = {
 					ev.deltaZ,
 					this.iWheelCumulative[2],
 				]
-				if (ShaderBoy.isPlaying !== true) ShaderBoy.forceDraw = true
+				ShaderBoy.forceDraw = !ShaderBoy.isPlaying
 			}
 		})
 
diff --git a/src/js/gui/gui_keyboard.js b/src/js/gui/gui_keyboard.js
index 931b22b..801c928 100644
--- a/src/js/gui/gui_keyboard.js
+++ b/src/js/gui/gui_keyboard.js
@@ -29,7 +29,7 @@ export default ShaderBoy.gui_keyboard = {
             {
                 if (ShaderBoy.isEditorHidden || ShaderBoy.isSplited){
                     this.setKeyDown( ev.keyCode )
-                    if (ShaderBoy.isPlaying !== true) ShaderBoy.forceDraw = true
+                    ShaderBoy.forceDraw = !ShaderBoy.isPlaying
                 }
             }
         }
@@ -42,7 +42,7 @@ export default ShaderBoy.gui_keyboard = {
                 console.log('onkeyup')
                 if (ShaderBoy.isEditorHidden || ShaderBoy.isSplited){
                     this.setKeyUp( ev.keyCode )
-                    if (ShaderBoy.isPlaying !== true) ShaderBoy.forceDraw = true
+                    ShaderBoy.forceDraw = !ShaderBoy.isPlaying
                 }
             }
         }
diff --git a/src/js/gui/gui_knobs.js b/src/js/gui/gui_knobs.js
index c551eef..b31be87 100644
--- a/src/js/gui/gui_knobs.js
+++ b/src/js/gui/gui_knobs.js
@@ -72,7 +72,7 @@ export default ShaderBoy.gui_knobs = {
 
                         if (ShaderBoy.gui.knobs.knobs[i].active === true)
                         {
-                            ShaderBoy.forceDraw = (ShaderBoy.isPlaying !== true)
+                            ShaderBoy.forceDraw = !ShaderBoy.isPlaying
                             const delta = (e.deltaY < 0) ? 1 : -1
                             const deg = e.deltaY
                             ShaderBoy.gui.knobs.knobs[i].value += delta * velocity * (1 / ShaderBoy.gui.knobs.precision)// deg * 1 / ShaderBoy.gui.knobs.precision
diff --git a/src/js/gui/gui_midi.js b/src/js/gui/gui_midi.js
index 156e666..ef7ab22 100644
--- a/src/js/gui/gui_midi.js
+++ b/src/js/gui/gui_midi.js
@@ -87,7 +87,7 @@ export default ShaderBoy.gui_midi = {
         {
             ShaderBoy.gui.midis[data.name] = data.value
         }
-        ShaderBoy.forceDraw = (ShaderBoy.isPlaying !== true)
+        ShaderBoy.forceDraw = !ShaderBoy.isPlaying
 
         ShaderBoy.gui_header.setStatus('prgrs', `MIDI: ${data.name} = ${data.value}...`, 3000)
     },
diff --git a/src/js/main.js b/src/js/main.js
index d98b3e9..65c5f3c 100644
--- a/src/js/main.js
+++ b/src/js/main.js
@@ -88,9 +88,15 @@ ShaderBoy.update = () =>
 	else if (ShaderBoy.forceDraw === true)
 	{
 		imageRenderer.render()
-		ShaderBoy.forceDraw = false
+		if(ShaderBoy.forceDrawnCount++>=2)
+		{
+			// idk why i have to draw 2 times to update viewport...
+			ShaderBoy.forceDraw = false
+			ShaderBoy.forceDrawnCount = 0
+		}
 	}
 
+
 	gui.redraw()
 }
 
diff --git a/src/js/shaderboy.js b/src/js/shaderboy.js
index f375132..dd7bb5b 100644
--- a/src/js/shaderboy.js
+++ b/src/js/shaderboy.js
@@ -31,6 +31,7 @@ const ShaderBoy = {
   isDirty: true,
 
   forceDraw: false,
+  forceDrawnCount: 0,
   editingBuffer: '',
   vsSource: null,
   screenShader: null,