Improve static noise by using pregenerated image instead of the shader we used before.

app/qml/PreprocessedTerminal.qml

@@ -46,6 +46,7 @@ Item{
     property real _maxBlurCoefficient: 0.90
 
     property size terminalSize: kterminal.terminalSize
+    property size fontMetrics: kterminal.fontMetrics
 
     // Manage copy and paste
     Connections{

app/qml/TerminalContainer.qml

@@ -54,53 +54,18 @@ ShaderTerminal{
 
     bloomSource: bloomSourceLoader.item
 
-    ShaderEffect {
-        id: staticNoiseEffect
-        anchors.fill: parent
-        property real element_size: appSettings.rasterization == appSettings.no_rasterization ? 2 : 1
-        property alias __terminalHeight: terminal.virtualResolution.height
-        property alias __terminalWidth: terminal.virtualResolution.width
-        property size virtual_resolution: Qt.size(__terminalWidth / element_size, __terminalHeight / element_size)
-
-        blending: false
-
-        fragmentShader:
-            "uniform lowp float qt_Opacity;
-             varying highp vec2 qt_TexCoord0;
-             uniform highp vec2 virtual_resolution;" +
-
-            "highp float noise(vec2 co)
-            {
-                highp float a = 12.9898;
-                highp float b = 78.233;
-                highp float c = 43758.5453;
-                highp float dt= dot(co.xy ,vec2(a,b));
-                highp float sn= mod(dt,3.14);
-                return fract(sin(sn) * c);
-            }
-
-            vec2 sw(vec2 p) {return vec2( floor(p.x) , floor(p.y) );}
-            vec2 se(vec2 p) {return vec2( ceil(p.x)  , floor(p.y) );}
-            vec2 nw(vec2 p) {return vec2( floor(p.x) , ceil(p.y)  );}
-            vec2 ne(vec2 p) {return vec2( ceil(p.x)  , ceil(p.y)  );}
-
-            float smoothNoise(vec2 p) {
-                vec2 inter = smoothstep(0., 1., fract(p));
-                float s = mix(noise(sw(p)), noise(se(p)), inter.x);
-                float n = mix(noise(nw(p)), noise(ne(p)), inter.x);
-                return mix(s, n, inter.y);
-            }" +
-
-            "void main() {" +
-                "gl_FragColor.a = smoothNoise(qt_TexCoord0 * virtual_resolution);" +
-            "}"
-
-        onStatusChanged: if (log) console.log(log) //Print warning messages
+    Image {
+        id: staticNoiseImage
+        source: "images/noise512.png"
+        anchors.centerIn: parent
+        width: parent.width / (appSettings.window_scaling * appSettings.fontScaling)
+        height: parent.height / (appSettings.window_scaling * appSettings.fontScaling)
+        fillMode: Image.Tile
     }
+
     noiseSource: ShaderEffectSource{
         id: staticNoiseSource
-        sourceItem: staticNoiseEffect
-        textureSize: Qt.size(mainShader.width, mainShader.height)
+        sourceItem: staticNoiseImage
         wrapMode: ShaderEffectSource.Repeat
         smooth: true
         hideSource: true
@@ -113,7 +78,7 @@ ShaderTerminal{
         height: parent.height
         property real outColor: 0.0
         property real dispX: (5 / width) * appSettings.window_scaling
-        property real dispY: 5 / height * appSettings.window_scaling
+        property real dispY: (5 / height) * appSettings.window_scaling
         property size virtual_resolution: terminal.virtualResolution
 
         blending: false

app/qml/resources.qrc

@@ -67,5 +67,6 @@
         <file>TerminalContainer.qml</file>
         <file>images/crt256.png</file>
         <file>utils.js</file>
+        <file>images/noise512.png</file>
     </qresource>
 </RCC>