Move constants to a separate qml file.

app/qml/ApplicationConstants.qml

@@ -0,0 +1,39 @@
+/*******************************************************************************
+* Copyright (c) 2013-2021 "Filippo Scognamiglio"
+* https://github.com/Swordfish90/cool-retro-term
+*
+* This file is part of cool-retro-term.
+*
+* cool-retro-term is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*******************************************************************************/
+import QtQuick 2.2
+
+QtObject {
+    readonly property string version: appVersion
+    readonly property int profileVersion: 2
+
+    readonly property real screenCurvatureSize: 0.4
+    readonly property real minimumFontScaling: 0.25
+    readonly property real maximumFontScaling: 2.50
+
+    readonly property real minBurnInFadeTime: 160
+    readonly property real maxBurnInFadeTime: 1600
+
+    readonly property int no_rasterization: 0
+    readonly property int scanline_rasterization: 1
+    readonly property int pixel_rasterization: 2
+    readonly property int subpixel_rasterization: 3
+
+    readonly property real baseFontScaling: 0.75
+}

app/qml/ApplicationSettings.qml

@@ -23,18 +23,8 @@ import QtQuick.Controls 2.0
 import "utils.js" as Utils
 
 QtObject {
-    readonly property string version: appVersion
-    readonly property int profileVersion: 2
 
-    // STATIC CONSTANTS ////////////////////////////////////////////////////////
-    readonly property real screenCurvatureSize: 0.4
-    readonly property real minimumFontScaling: 0.25
-    readonly property real maximumFontScaling: 2.50
-
-    readonly property real minBurnInFadeTime: 160
-    readonly property real maxBurnInFadeTime: 1600
-
-    // GENERAL SETTINGS ///////////////////////////////////////////////////////
+    // APPLICATION SETTINGS ///////////////////////////////////////////////////////
     property int x: 100
     property int y: 100
     property int width: 1024
@@ -56,8 +46,6 @@ QtObject {
     property real burnInQuality: 0.5
     property bool useFastBurnIn: Qt.platform.os === "osx" ? false : true
 
-    property bool blinkingCursor: false
-
     onWindowScalingChanged: handleFontChanged()
 
     // PROFILE SETTINGS ///////////////////////////////////////////////////////
@@ -99,18 +87,20 @@ QtObject {
     property real rbgShift: 0.0
 
     property real _margin: 0.5
-    property real margin: Utils.lint(1.0, 20.0, _margin)
+    property real _frameMargin: 0.5
 
-    readonly property int no_rasterization: 0
-    readonly property int scanline_rasterization: 1
-    readonly property int pixel_rasterization: 2
+    property real margin: Utils.lint(1.0, 20.0, _margin)
+    property real frameMargin: Utils.lint(1.0, 50.0, _frameMargin)
+
+    property real totalMargin: frameMargin + margin
 
     property int rasterization: no_rasterization
 
+    property bool blinkingCursor: false
+
     // FONTS //////////////////////////////////////////////////////////////////
-    readonly property real baseFontScaling: 0.75
     property real fontScaling: 1.0
-    property real totalFontScaling: baseFontScaling * fontScaling
+    property real totalFontScaling: appConstants.baseFontScaling * fontScaling
 
     property real fontWidth: 1.0
 
@@ -126,21 +116,28 @@ QtObject {
     property Loader fontManager: Loader {
         states: [
             State {
-                when: rasterization == no_rasterization
+                when: rasterization == appConstants.no_rasterization
                 PropertyChanges {
                     target: fontManager
                     source: "Fonts.qml"
                 }
             },
             State {
-                when: rasterization == scanline_rasterization
+                when: rasterization == appConstants.scanline_rasterization
                 PropertyChanges {
                     target: fontManager
                     source: "FontScanlines.qml"
                 }
             },
             State {
-                when: rasterization == pixel_rasterization
+                when: rasterization == appConstants.pixel_rasterization
+                PropertyChanges {
+                    target: fontManager
+                    source: "FontPixels.qml"
+                }
+            },
+            State {
+                when: rasterization == appConstants.subpixel_rasterization
                 PropertyChanges {
                     target: fontManager
                     source: "FontPixels.qml"
@@ -166,12 +163,12 @@ QtObject {
     }
 
     function incrementScaling() {
-        fontScaling = Math.min(fontScaling + 0.05, maximumFontScaling)
+        fontScaling = Math.min(fontScaling + 0.05, appConstants.maximumFontScaling)
         handleFontChanged()
     }
 
     function decrementScaling() {
-        fontScaling = Math.max(fontScaling - 0.05, minimumFontScaling)
+        fontScaling = Math.max(fontScaling - 0.05, appConstants.minimumFontScaling)
         handleFontChanged()
     }
 
@@ -230,8 +227,7 @@ QtObject {
             "burnInQuality": burnInQuality,
             "useCustomCommand": useCustomCommand,
             "customCommand": customCommand,
-            "useFastBurnIn": useFastBurnIn,
-            "blinkingCursor": blinkingCursor
+            "useFastBurnIn": useFastBurnIn
         }
         return stringify(settings)
     }
@@ -258,7 +254,9 @@ QtObject {
             "windowOpacity": windowOpacity,
             "fontName": fontNames[rasterization],
             "fontWidth": fontWidth,
-            "margin": _margin
+            "margin": _margin,
+            "blinkingCursor": blinkingCursor,
+            "frameMargin": _frameMargin,
         }
         return settings
     }
@@ -327,9 +325,6 @@ QtObject {
 
         useFastBurnIn = settings.useFastBurnIn
                 !== undefined ? settings.useFastBurnIn : useFastBurnIn
-
-        blinkingCursor = settings.blinkingCursor
-                !== undefined ? settings.blinkingCursor : blinkingCursor
     }
 
     function loadProfileString(profileString) {
@@ -371,6 +366,9 @@ QtObject {
         fontWidth = settings.fontWidth !== undefined ? settings.fontWidth : fontWidth
 
         _margin = settings.margin !== undefined ? settings.margin : _margin
+        _frameMargin = settings.frameMargin !== undefined ? settings.frameMargin : _frameMargin
+
+        blinkingCursor = settings.blinkingCursor !== undefined ? settings.blinkingCursor : blinkingCursor
 
         handleFontChanged()
     }
@@ -451,7 +449,9 @@ QtObject {
                 "screenCurvature": 0.3,
                 "staticNoise": 0.1198,
                 "windowOpacity": 1,
-                "margin": 0.5
+                "margin": 0.5,
+                "blinkingCursor": false,
+                "frameMargin": 0.1
             }'
             builtin: true
         }
@@ -478,7 +478,9 @@ QtObject {
                 "screenCurvature": 0.3,
                 "staticNoise": 0.1198,
                 "windowOpacity": 1,
-                "margin": 0.5
+                "margin": 0.5,
+                "blinkingCursor": false,
+                "frameMargin": 0.1
             }'
             builtin: true
         }
@@ -505,7 +507,9 @@ QtObject {
                 "screenCurvature": 0.3,
                 "staticNoise": 0.15,
                 "windowOpacity": 1,
-                "margin": 0.5
+                "margin": 0.5,
+                "blinkingCursor": false,
+                "frameMargin": 0.1
             }'
             builtin: true
         }
@@ -532,7 +536,9 @@ QtObject {
                 "screenCurvature": 0,
                 "staticNoise": 0.15,
                 "windowOpacity": 1,
-                "margin": 0.5
+                "margin": 0.5,
+                "blinkingCursor": false,
+                "frameMargin": 0.1
             }'
             builtin: true
         }
@@ -559,7 +565,9 @@ QtObject {
                 "screenCurvature": 0.5,
                 "staticNoise": 0.099,
                 "windowOpacity": 1,
-                "margin": 0.5
+                "margin": 0.5,
+                "blinkingCursor": false,
+                "frameMargin": 0.2
             }'
             builtin: true
         }
@@ -586,7 +594,9 @@ QtObject {
                 "screenCurvature": 0.5,
                 "staticNoise": 0.2969,
                 "windowOpacity": 1,
-                "margin": 0.5
+                "margin": 0.5,
+                "blinkingCursor": false,
+                "frameMargin": 0.5
             }'
             builtin: true
         }
@@ -613,7 +623,9 @@ QtObject {
                 "screenCurvature": 0.4,
                 "staticNoise": 0.0503,
                 "windowOpacity": 1,
-                "margin": 0.5
+                "margin": 0.5,
+                "blinkingCursor": false,
+                "frameMargin": 0.2
             }'
             builtin: true
         }
@@ -640,7 +652,9 @@ QtObject {
                 "screenCurvature": 0.2,
                 "staticNoise": 0,
                 "windowOpacity": 1,
-                "margin": 0.5
+                "margin": 0.5,
+                "blinkingCursor": false,
+                "frameMargin": 0.1
             }'
             builtin: true
         }
@@ -667,7 +681,9 @@ QtObject {
                 "screenCurvature": 0,
                 "staticNoise": 0.0955,
                 "windowOpacity": 0.7,
-                "margin": 0.1
+                "margin": 0.1,
+                "blinkingCursor": false,
+                "frameMargin": 0
             }'
             builtin: true
         }

app/qml/BurnInEffect.qml

@@ -32,8 +32,8 @@ Loader {
     property real delay: (1.0 / appSettings.fps) * 1000
     property real burnIn: appSettings.burnIn
     property real burnInFadeTime: 1 / Utils.lint(_minBurnInFadeTime, _maxBurnInFadeTime, burnIn)
-    property real _minBurnInFadeTime: appSettings.minBurnInFadeTime
-    property real _maxBurnInFadeTime: appSettings.maxBurnInFadeTime
+    property real _minBurnInFadeTime: appConstants.minBurnInFadeTime
+    property real _maxBurnInFadeTime: appConstants.maxBurnInFadeTime
 
     active: appSettings.useFastBurnIn && appSettings.burnIn !== 0
 
@@ -89,6 +89,10 @@ Loader {
             }
         }
 
+        ShaderLibrary {
+            id: shaderLibrary
+        }
+
         ShaderEffect {
             id: burnInShaderEffect
 
@@ -118,9 +122,7 @@ Loader {
 
                  uniform highp float prevLastUpdate;" +
 
-                "float rgb2grey(vec3 v){
-                    return dot(v, vec3(0.21, 0.72, 0.04));
-                }" +
+                shaderLibrary.rgb2grey +
 
                 "void main() {
                     vec2 coords = qt_TexCoord0;

app/qml/PreprocessedTerminal.qml

@@ -73,7 +73,7 @@ Item{
         id: kterminal
 
         property int textureResolutionScale: appSettings.lowResolutionFont ? devicePixelRatio : 1
-        property int margin: appSettings.margin / screenScaling
+        property int margin: appSettings.totalMargin / screenScaling
         property int totalWidth: Math.floor(parent.width / (screenScaling * fontWidth))
         property int totalHeight: Math.floor(parent.height / screenScaling)
 
@@ -177,8 +177,8 @@ Item{
     }
     property alias contextmenu: menuLoader.item
 
-    MouseArea{
-        property real margin: appSettings.margin
+    MouseArea {
+        property real margin: appSettings.totalMargin
 
         acceptedButtons: Qt.LeftButton | Qt.MiddleButton | Qt.RightButton
         anchors.fill: parent
@@ -217,10 +217,10 @@ Item{
             y = (y - margin) / height;
 
             var cc = Qt.size(0.5 - x, 0.5 - y);
-            var distortion = (cc.height * cc.height + cc.width * cc.width) * appSettings.screenCurvature * appSettings.screenCurvatureSize;
+            var distortion = (cc.height * cc.height + cc.width * cc.width) * appSettings.screenCurvature * appConstants.screenCurvatureSize;
 
-            return Qt.point((x - cc.width  * (1+distortion) * distortion) * kterminal.totalWidth,
-                           (y - cc.height * (1+distortion) * distortion) * kterminal.totalHeight)
+            return Qt.point((x - cc.width  * (1+distortion) * distortion) * (kterminal.totalWidth),
+                           (y - cc.height * (1+distortion) * distortion) * (kterminal.totalHeight))
         }
     }
     ShaderEffectSource{

app/qml/SettingsAdvancedTab.qml

@@ -156,7 +156,7 @@ ColumnLayout {
             }
             CheckBox {
                 Layout.columnSpan: 2
-                text: qsTr("Burnin optimization (Might display timing artifacts)")
+                text: qsTr("Burnin optimization (might display timing artifacts)")
                 checked: appSettings.useFastBurnIn
                 onCheckedChanged: appSettings.useFastBurnIn = checked
             }

app/qml/SettingsGeneralTab.qml

@@ -113,7 +113,7 @@ ColumnLayout {
 
                             var version = profileObject.version
                                     !== undefined ? profileObject.version : 1
-                            if (version !== appSettings.profileVersion)
+                            if (version !== appConstants.profileVersion)
                                 throw "This profile is not supported on this version of CRT."
 
                             delete profileObject.name
@@ -160,7 +160,7 @@ ColumnLayout {
                             var profileSettings = JSON.parse(
                                         profileObject.obj_string)
                             profileSettings["name"] = profileObject.text
-                            profileSettings["version"] = appSettings.profileVersion
+                            profileSettings["version"] = appConstants.profileVersion
 
                             var result = fileIO.write(url, JSON.stringify(
                                                           profileSettings,
@@ -206,6 +206,13 @@ ColumnLayout {
                 onValueChanged: appSettings._margin = value
                 value: appSettings._margin
             }
+            Label {
+                text: qsTr("Frame size")
+            }
+            SimpleSlider {
+                onValueChanged: appSettings._frameMargin = value
+                value: appSettings._frameMargin
+            }
             Label {
                 text: qsTr("Opacity")
             }

app/qml/SettingsTerminalTab.qml

@@ -41,7 +41,7 @@ ColumnLayout {
                 property string selectedElement: model[currentIndex]
 
                 Layout.fillWidth: true
-                model: [qsTr("Default"), qsTr("Scanlines"), qsTr("Pixels")]
+                model: [qsTr("Default"), qsTr("Scanlines"), qsTr("Pixels"), qsTr("Sub-Pixels")]
                 currentIndex: appSettings.rasterization
                 onCurrentIndexChanged: {
                     appSettings.rasterization = currentIndex
@@ -83,8 +83,8 @@ ColumnLayout {
                     onValueChanged: appSettings.fontScaling = value
                     value: appSettings.fontScaling
                     stepSize: 0.05
-                    from: appSettings.minimumFontScaling
-                    to: appSettings.maximumFontScaling
+                    from: appConstants.minimumFontScaling
+                    to: appConstants.maximumFontScaling
                 }
                 SizedLabel {
                     text: Math.round(fontScalingChanger.value * 100) + "%"

app/qml/ShaderLibrary.qml

@@ -0,0 +1,91 @@
+import QtQuick 2.0
+
+QtObject {
+    property string rasterizationShader:
+        (appSettings.rasterization === appConstants.no_rasterization ? "
+            lowp vec3 applyRasterization(vec2 screenCoords, lowp vec3 texel, vec2 virtualResolution, float intensity) {
+                return texel;
+            }" : "") +
+
+        (appSettings.rasterization === appConstants.scanline_rasterization ? "
+            #define INTENSITY 0.30
+            #define BRIGHTBOOST 0.30
+
+            lowp vec3 applyRasterization(vec2 screenCoords, lowp vec3 texel, vec2 virtualResolution, float intensity) {
+                lowp vec3 pixelHigh = ((1.0 + BRIGHTBOOST) - (0.2 * texel)) * texel;
+                lowp vec3 pixelLow  = ((1.0 - INTENSITY) + (0.1 * texel)) * texel;
+
+                vec2 coords = fract(screenCoords * virtualResolution) * 2.0 - vec2(1.0);
+                lowp float mask = 1.0 - abs(coords.y);
+
+                lowp vec3 rasterizationColor = mix(pixelLow, pixelHigh, mask);
+                return mix(texel, rasterizationColor, intensity);
+            }" : "") +
+
+        (appSettings.rasterization === appConstants.pixel_rasterization ? "
+            #define INTENSITY 0.30
+            #define BRIGHTBOOST 0.30
+
+            lowp vec3 applyRasterization(vec2 screenCoords, lowp vec3 texel, vec2 virtualResolution, float intensity) {
+                lowp vec3 result = texel;
+
+                lowp vec3 pixelHigh = ((1.0 + BRIGHTBOOST) - (0.2 * texel)) * texel;
+                lowp vec3 pixelLow  = ((1.0 - INTENSITY) + (0.1 * texel)) * texel;
+
+                vec2 coords = fract(screenCoords * virtualResolution) * 2.0 - vec2(1.0);
+                coords = coords * coords;
+                lowp float mask = 1.0 - coords.x - coords.y;
+
+                lowp vec3 rasterizationColor = mix(pixelLow, pixelHigh, mask);
+                return mix(texel, rasterizationColor, intensity);
+            }" : "") +
+
+        (appSettings.rasterization === appConstants.subpixel_rasterization ? "
+            #define INTENSITY 0.30
+            #define BRIGHTBOOST 0.30
+            #define SUBPIXELS 3.0
+            const vec3 offsets = vec3(3.141592654) * vec3(1.0/2.0,1.0/2.0 - 2.0/3.0,1.0/2.0-4.0/3.0);
+
+            lowp vec3 applyRasterization(vec2 screenCoords, lowp vec3 texel, vec2 virtualResolution, float intensity) {
+                vec2 omega = vec2(3.141592654) * vec2(2.0) * virtualResolution;
+                vec2 angle = screenCoords * omega;
+                vec3 xfactors = (SUBPIXELS + sin(angle.x + offsets)) / (SUBPIXELS + 1.0);
+
+                lowp vec3 result = texel * xfactors;
+                lowp vec3 pixelHigh = ((1.0 + BRIGHTBOOST) - (0.2 * result)) * result;
+                lowp vec3 pixelLow  = ((1.0 - INTENSITY) + (0.1 * result)) * result;
+
+                vec2 coords = fract(screenCoords * virtualResolution) * 2.0 - vec2(1.0);
+                lowp float mask = 1.0 - abs(coords.y);
+
+                lowp vec3 rasterizationColor = mix(pixelLow, pixelHigh, mask);
+                return mix(texel, rasterizationColor, intensity);
+            }" : "") +
+
+        "\n\n"
+
+    property string min2: "
+        float min2(vec2 v) {
+            return min(v.x, v.y);
+        }\n\n"
+
+    property string rgb2grey: "
+        float rgb2grey(vec3 v) {
+            return dot(v, vec3(0.21, 0.72, 0.04));
+        }\n\n"
+
+    property string max2: "
+        float max2(vec2 v) {
+            return max(v.x, v.y);
+        }\n\n"
+
+    property string prod2: "
+        float prod2(vec2 v) {
+            return v.x * v.y;
+        }\n\n"
+
+    property string sum2: "
+        float sum2(vec2 v) {
+            return v.x + v.y;
+        }\n\n"
+}

app/qml/ShaderTerminal.qml

@@ -32,17 +32,25 @@ Item {
     property color fontColor: appSettings.fontColor
     property color backgroundColor: appSettings.backgroundColor
 
-    property real screenCurvature: appSettings.screenCurvature * appSettings.screenCurvatureSize
+    property real screenCurvature: appSettings.screenCurvature * appConstants.screenCurvatureSize
 
     property real chromaColor: appSettings.chromaColor
 
     property real ambientLight: appSettings.ambientLight * 0.2
 
-    property size virtual_resolution
+    property size virtualResolution
+    property size screenResolution
+
+    property real _screenDensity: Math.min(
+        screenResolution.width / virtualResolution.width,
+        screenResolution.height / virtualResolution.height
+    )
 
      ShaderEffect {
          id: dynamicShader
 
+         property ShaderLibrary shaderLibrary: ShaderLibrary { }
+
          property ShaderEffectSource screenBuffer: frameBuffer
          property ShaderEffectSource burnInSource: burnInEffect.source
          property ShaderEffectSource frameSource: terminalFrameLoader.item
@@ -71,10 +79,16 @@ Item {
          property size jitterDisplacement: Qt.size(0.007 * jitter, 0.002 * jitter)
          property real shadowLength: 0.25 * screenCurvature * Utils.lint(0.50, 1.5, ambientLight)
          property real staticNoise: appSettings.staticNoise
-         property size scaleNoiseSize: Qt.size((width) / (noiseTexture.width * appSettings.windowScaling * appSettings.totalFontScaling),
-                                               (height) / (noiseTexture.height * appSettings.windowScaling * appSettings.totalFontScaling))
+         property size scaleNoiseSize: Qt.size((width * 0.75) / (noiseTexture.width * appSettings.windowScaling * appSettings.totalFontScaling),
+                                               (height * 0.75) / (noiseTexture.height * appSettings.windowScaling * appSettings.totalFontScaling))
 
-         property size virtual_resolution: parent.virtual_resolution
+         property size virtualResolution: parent.virtualResolution
+
+         // Rasterization might display oversamping issues if virtual resolution is close to physical display resolution.
+         // We progressively disable rasterization from 4x up to 2x resolution.
+         property real rasterizationIntensity: Utils.smoothstep(2.0, 4.0, _screenDensity)
+
+         property real displayTerminalFrame: appSettings._frameMargin > 0 || appSettings.screenCurvature > 0
 
          property real time: timeManager.time
          property ShaderEffectSource noiseSource: noiseShaderSource
@@ -164,7 +178,8 @@ Item {
              uniform highp vec4 backgroundColor;
              uniform lowp float shadowLength;
 
-             uniform highp vec2 virtual_resolution;" +
+             uniform highp vec2 virtualResolution;
+             uniform lowp float rasterizationIntensity;\n" +
 
              (burnIn !== 0 ? "
                  uniform sampler2D burnInSource;
@@ -174,13 +189,13 @@ Item {
                  uniform sampler2D slowBurnInSource;" : "") +
              (staticNoise !== 0 ? "
                  uniform highp float staticNoise;" : "") +
-             (((staticNoise !== 0 || jitter !== 0)
-               ||(fallBack && (flickering || horizontalSync))) ? "
+             (((staticNoise !== 0 || jitter !== 0) ||(fallBack && (flickering || horizontalSync))) ? "
                  uniform lowp sampler2D noiseSource;
                  uniform highp vec2 scaleNoiseSize;" : "") +
-             (screenCurvature !== 0 ? "
-                 uniform highp float screenCurvature;
+             (displayTerminalFrame ? "
                  uniform lowp sampler2D frameSource;" : "") +
+             (screenCurvature !== 0 ? "
+                 uniform highp float screenCurvature;" : "") +
              (glowingLine !== 0 ? "
                  uniform highp float glowingLine;" : "") +
              (chromaColor !== 0 ? "
@@ -203,17 +218,14 @@ Item {
 
              (glowingLine !== 0 ? "
                  float randomPass(vec2 coords){
-                     return fract(smoothstep(-120.0, 0.0, coords.y - (virtual_resolution.y + 120.0) * fract(time * 0.00015)));
+                     return fract(smoothstep(-120.0, 0.0, coords.y - (virtualResolution.y + 120.0) * fract(time * 0.00015)));
                  }" : "") +
 
-             "float min2(vec2 v) {
-                 return min(v.x, v.y);
-             }
-
-             float rgb2grey(vec3 v){
-                 return dot(v, vec3(0.21, 0.72, 0.04));
-             }
+             shaderLibrary.min2 +
+             shaderLibrary.rgb2grey +
+             shaderLibrary.rasterizationShader +
 
+             "
              float isInScreen(vec2 v) {
                  return min2(step(0.0, v) - step(1.0, v));
              }
@@ -291,7 +303,7 @@ Item {
                      color += noiseVal * noise * (1.0 - distance * 1.3);" : "") +
 
                  (glowingLine !== 0 ? "
-                     color += randomPass(coords * virtual_resolution) * glowingLine;" : "") +
+                     color += randomPass(coords * virtualResolution) * glowingLine;" : "") +
 
                  "vec3 txt_color = texture2D(screenBuffer, txt_coords).rgb;" +
 
@@ -309,6 +321,8 @@ Item {
 
                   "txt_color += fontColor.rgb * vec3(color);" +
 
+                  "txt_color = applyRasterization(staticCoords, txt_color, virtualResolution, rasterizationIntensity);\n" +
+
                  "vec3 finalColor = txt_color;" +
 
                  (flickering !== 0 ? "
@@ -317,7 +331,7 @@ Item {
                  (ambientLight !== 0 ? "
                      finalColor += vec3(ambientLight) * (1.0 - distance) * (1.0 - distance);" : "") +
 
-                 (screenCurvature !== 0 ?
+                 (displayTerminalFrame ?
                     "vec4 frameColor = texture2D(frameSource, qt_TexCoord0);
                      finalColor = mix(finalColor, frameColor.rgb, frameColor.a);"
                  : "") +
@@ -340,7 +354,7 @@ Item {
      Loader {
          id: terminalFrameLoader
 
-         active: screenCurvature !== 0
+         active: dynamicShader.displayTerminalFrame
 
          width: staticShader.width
          height: staticShader.height
@@ -352,7 +366,7 @@ Item {
              visible: false
              format: ShaderEffectSource.RGBA
 
-             NewTerminalFrame {
+             TerminalFrame {
                  id: terminalFrame
                  blending: false
                  anchors.fill: parent
@@ -360,6 +374,10 @@ Item {
          }
      }
 
+     ShaderLibrary {
+         id: shaderLibrary
+     }
+
      ShaderEffect {
          id: staticShader
 
@@ -385,7 +403,7 @@ Item {
 
          property real ambientLight: parent.ambientLight
 
-         property size virtual_resolution: parent.virtual_resolution
+         property size virtualResolution: parent.virtualResolution
 
          blending: false
          visible: false
@@ -408,7 +426,7 @@ Item {
              uniform highp vec4 backgroundColor;
              uniform lowp float screen_brightness;
 
-             uniform highp vec2 virtual_resolution;" +
+             uniform highp vec2 virtualResolution;" +
 
              (bloom !== 0 ? "
                  uniform highp sampler2D bloomSource;
@@ -426,36 +444,9 @@ Item {
              (ambientLight !== 0 ? "
                  uniform lowp float ambientLight;" : "") +
 
-             "highp float getScanlineIntensity(vec2 coords) {
-                 float result = 1.0;" +
-
-                (appSettings.rasterization != appSettings.no_rasterization ?
-                    "float val = 0.0;
-                     vec2 rasterizationCoords = fract(coords * virtual_resolution);
-                     val += smoothstep(0.0, 0.5, rasterizationCoords.y);
-                     val -= smoothstep(0.5, 1.0, rasterizationCoords.y);
-                     result *= mix(0.5, 1.0, val);" : "") +
-
-                (appSettings.rasterization == appSettings.pixel_rasterization ?
-                    "val = 0.0;
-                     val += smoothstep(0.0, 0.5, rasterizationCoords.x);
-                     val -= smoothstep(0.5, 1.0, rasterizationCoords.x);
-                     result *= mix(0.5, 1.0, val);" : "") + "
-
-                return result;
-             }
-
-             float min2(vec2 v) {
-                 return min(v.x, v.y);
-             }
-
-             float sum2(vec2 v) {
-                 return v.x + v.y;
-             }
-
-             float rgb2grey(vec3 v){
-                 return dot(v, vec3(0.21, 0.72, 0.04));
-             }" +
+             shaderLibrary.min2 +
+             shaderLibrary.sum2 +
+             shaderLibrary.rgb2grey +
 
              "vec3 convertWithChroma(vec3 inColor) {
                 vec3 outColor = inColor;" +
@@ -468,6 +459,7 @@ Item {
              "  return outColor;
              }" +
 
+             shaderLibrary.rasterizationShader +
 
              "void main() {" +
                  "vec2 cc = vec2(0.5) - qt_TexCoord0;" +
@@ -490,8 +482,6 @@ Item {
                      txt_color.b = leftColor.b * 0.30 + rightColor.b * 0.10 + txt_color.b * 0.60;
                  " : "") +
 
-                  "txt_color *= getScanlineIntensity(txt_coords);" +
-
                   "txt_color += vec3(0.0001);" +
                   "float greyscale_color = rgb2grey(txt_color);" +
 

app/qml/SlowBurnIn.qml

@@ -38,8 +38,8 @@ Loader {
             property real fps: appSettings.fps !== 0 ? appSettings.fps : 60
             property real burnInFadeTime: Utils.lint(minBurnInFadeTime, maxBurnInFadeTime, burnIn)
             property real burnInCoefficient: 1000 / (fps * burnInFadeTime)
-            property real minBurnInFadeTime: appSettings.minBurnInFadeTime
-            property real maxBurnInFadeTime: appSettings.maxBurnInFadeTime
+            property real minBurnInFadeTime: appConstants.minBurnInFadeTime
+            property real maxBurnInFadeTime: appConstants.maxBurnInFadeTime
 
             id: burnInSourceEffect
 

app/qml/TerminalContainer.qml

@@ -26,13 +26,19 @@ ShaderTerminal {
     property alias title: terminal.title
     property alias terminalSize: terminal.terminalSize
 
+    property real devicePixelRatio: terminalWindow.screen.devicePixelRatio
+
     id: mainShader
     opacity: appSettings.windowOpacity * 0.3 + 0.7
 
     source: terminal.mainSource
     burnInEffect: terminal.burnInEffect
     slowBurnInEffect: terminal.slowBurnInEffect
-    virtual_resolution: terminal.virtualResolution
+    virtualResolution: terminal.virtualResolution
+    screenResolution: Qt.size(
+        terminalWindow.width * devicePixelRatio * appSettings.windowScaling,
+        terminalWindow.height * devicePixelRatio * appSettings.windowScaling
+    )
 
     TimeManager {
         id: timeManager

app/qml/TerminalFrame.qml

@@ -22,17 +22,27 @@ import QtQuick 2.0
 import "utils.js" as Utils
 
 ShaderEffect {
-    property color _staticFrameColor: "#ffffff"
+    property color _staticFrameColor: "#fff"
     property color _backgroundColor: appSettings.backgroundColor
     property color _fontColor: appSettings.fontColor
     property color _lightColor: Utils.mix(_fontColor, _backgroundColor, 0.2)
     property real _ambientLight: Utils.lint(0.2, 0.8, appSettings.ambientLight)
 
     property color frameColor: Utils.mix(_staticFrameColor, _lightColor, _ambientLight)
-    property real screenCurvature: appSettings.screenCurvature * appSettings.screenCurvatureSize
-    property real shadowLength: 0.5 * screenCurvature * Utils.lint(0.50, 1.5, _ambientLight)
+    property real screenCurvature: appSettings.screenCurvature * appConstants.screenCurvatureSize
 
-    property size aadelta: Qt.size(1.0 / width, 1.0 / height)
+    // Coefficient of the log curve used to approximate shadowing
+    property real screenShadowCoeff: Utils.lint(20.0, 10.0, _ambientLight)
+    property real frameShadowCoeff: Utils.lint(20.0, 10.0, _ambientLight)
+
+    property size margin: Qt.size(
+        appSettings.frameMargin / width * appSettings.windowScaling,
+        appSettings.frameMargin / height * appSettings.windowScaling
+    )
+
+    ShaderLibrary {
+        id: shaderLibrary
+    }
 
     fragmentShader: "
         #ifdef GL_ES
@@ -40,10 +50,11 @@ ShaderEffect {
         #endif
 
         uniform lowp float screenCurvature;
-        uniform lowp float shadowLength;
+        uniform lowp float screenShadowCoeff;
+        uniform lowp float frameShadowCoeff;
         uniform highp float qt_Opacity;
         uniform lowp vec4 frameColor;
-        uniform mediump vec2 aadelta;
+        uniform mediump vec2 margin;
 
         varying highp vec2 qt_TexCoord0;
 
@@ -52,42 +63,38 @@ ShaderEffect {
             float dist = dot(cc, cc) * screenCurvature;
             return (coords + cc * (1.0 + dist) * dist);
         }
+        " +
 
-        float max2(vec2 v) {
-            return max(v.x, v.y);
+        shaderLibrary.max2 +
+        shaderLibrary.min2 +
+        shaderLibrary.prod2 +
+        shaderLibrary.sum2 +
+
+        "
+
+        vec2 positiveLog(vec2 x) {
+            return clamp(log(x), vec2(0.0), vec2(100.0));
         }
 
-        float min2(vec2 v) {
-            return min(v.x, v.y);
-        }
-
-        float prod2(vec2 v) {
-            return v.x * v.y;
-        }
-
-        float sum2(vec2 v) {
-            return v.x + v.y;
-        }
-
-        void main(){
+        void main() {
             vec2 staticCoords = qt_TexCoord0;
-            vec2 coords = distortCoordinates(staticCoords);
+            vec2 coords = distortCoordinates(staticCoords) * (vec2(1.0) + margin * 2.0) - margin;
 
-            vec3 color = vec3(0.0);
+            vec2 vignetteCoords = staticCoords * (1.0 - staticCoords.yx);
+            float vignette = pow(prod2(vignetteCoords) * 15.0, 0.25);
+
+            vec3 color = frameColor.rgb * vec3(1.0 - vignette);
             float alpha = 0.0;
 
-            float outShadowLength = shadowLength;
-            float inShadowLength = shadowLength * 0.5;
+            float frameShadow = max2(positiveLog(-coords * frameShadowCoeff + vec2(1.0)) + positiveLog(coords * frameShadowCoeff - (vec2(frameShadowCoeff) - vec2(1.0))));
+            frameShadow = max(sqrt(frameShadow), 0.0);
+            color *= frameShadow;
+            alpha = sum2(1.0 - step(vec2(0.0), coords) + step(vec2(1.0), coords));
+            alpha = clamp(alpha, 0.0, 1.0);
+            alpha *= mix(1.0, 0.9, frameShadow);
 
-            float outShadow = max2(1.0 - smoothstep(vec2(-outShadowLength), vec2(0.0), coords) + smoothstep(vec2(1.0), vec2(1.0 + outShadowLength), coords));
-            outShadow = clamp(sqrt(outShadow), 0.0, 1.0);
-            color += frameColor.rgb * outShadow;
-            alpha = sum2(1.0 - smoothstep(vec2(0.0), aadelta, coords) + smoothstep(vec2(1.0) - aadelta, vec2(1.0), coords));
-            alpha = clamp(alpha, 0.0, 1.0) * mix(1.0, 0.9, outShadow);
-
-            float inShadow = 1.0 - prod2(smoothstep(0.0, inShadowLength, coords) - smoothstep(1.0 - inShadowLength, 1.0, coords));
-            inShadow = 0.5 * inShadow * inShadow;
-            alpha = max(alpha, inShadow);
+            float screenShadow = 1.0 - prod2(positiveLog(coords * screenShadowCoeff + vec2(1.0)) * positiveLog(-coords * screenShadowCoeff + vec2(screenShadowCoeff + 1.0)));
+            alpha = max(0.8 * screenShadow, alpha);
 
             gl_FragColor = vec4(color * alpha, alpha);
         }

app/qml/main.qml

@@ -127,6 +127,9 @@ ApplicationWindow {
             aboutDialog.raise()
         }
     }
+    ApplicationConstants {
+        id: appConstants
+    }
     ApplicationSettings {
         id: appSettings
     }

app/qml/resources.qrc

@@ -40,10 +40,12 @@
         <file>fonts/1977-commodore-pet/PetMe.ttf</file>
         <file>BurnInEffect.qml</file>
         <file>fonts/modern-terminus/TerminusTTF-4.46.0.ttf</file>
-        <file>NewTerminalFrame.qml</file>
+        <file>TerminalFrame.qml</file>
         <file>SlowBurnIn.qml</file>
         <file>menus/WindowMenu.qml</file>
         <file>menus/FullContextMenu.qml</file>
         <file>menus/ShortContextMenu.qml</file>
+        <file>ShaderLibrary.qml</file>
+        <file>ApplicationConstants.qml</file>
     </qresource>
 </RCC>

app/qml/utils.js

@@ -31,13 +31,18 @@ function lint(a, b, t) {
     return (1 - t) * a + (t) * b;
 }
 
-function mix(c1, c2, alpha){
+function mix(c1, c2, alpha) {
     return Qt.rgba(c1.r * alpha + c2.r * (1-alpha),
                    c1.g * alpha + c2.g * (1-alpha),
                    c1.b * alpha + c2.b * (1-alpha),
                    c1.a * alpha + c2.a * (1-alpha))
 }
 
+function smoothstep(min, max, value) {
+    let x = Math.max(0, Math.min(1, (value - min) / (max - min)));
+    return x * x * (3 - 2 * x);
+}
+
 function strToColor(s){
     var r = parseInt(s.substring(1,3), 16) / 256;
     var g = parseInt(s.substring(3,5), 16) / 256;