project file allow installation in another dir than "/usr"

E.g. this way I can build and install in "~/.local", or "/usr/local".

app/app.pro

@@ -16,23 +16,29 @@ macx:ICON = icons/crt.icns
 RESOURCES += qml/resources.qrc
 
 #########################################
-##              INTALLS
+##              INSTALLS
 #########################################
 
-target.path += /usr/bin/
+PREFIX = $$(PREFIX) # Pass the make install PREFIX via environment variable. E.g. "PREFIX=/path/to/my/dir qmake".
+isEmpty(PREFIX) {
+    message(No prefix given. Using /usr.)
+    PREFIX=/usr
+}
+
+target.path = $$PREFIX/bin
 
 INSTALLS += target
 
 # Install icons
 unix {
     icon32.files = icons/32x32/cool-retro-term.png
-    icon32.path = /usr/share/icons/hicolor/32x32/apps
+    icon32.path = $$PREFIX/share/icons/hicolor/32x32/apps
     icon64.files = icons/64x64/cool-retro-term.png
-    icon64.path = /usr/share/icons/hicolor/64x64/apps
+    icon64.path = $$PREFIX/share/icons/hicolor/64x64/apps
     icon128.files = icons/128x128/cool-retro-term.png
-    icon128.path = /usr/share/icons/hicolor/128x128/apps
+    icon128.path = $$PREFIX/share/icons/hicolor/128x128/apps
     icon256.files = icons/256x256/cool-retro-term.png
-    icon256.path = /usr/share/icons/hicolor/256x256/apps
+    icon256.path = $$PREFIX/share/icons/hicolor/256x256/apps
 
     INSTALLS += icon32 icon64 icon128 icon256
 }

app/main.cpp

@@ -49,15 +49,15 @@ int main(int argc, char *argv[])
 
     if (argc>1 && (!strcmp(argv[1],"-h") || !strcmp(argv[1],"--help"))) {
         QTextStream cout(stdout, QIODevice::WriteOnly);
-        cout << "Usage: " << argv[0] << " [--default-settings] [--workdir <dir>] [--program <prog>] [-p|--profile <prof>] [--fullscreen] [-h|--help]" << endl;
+        cout << "Usage: " << argv[0] << " [--default-settings] [--workdir <dir>] [--program <prog>] [-p|--profile <prof>] [--fullscreen] [-h|--help]" << '\n';
-        cout << "  --default-settings  Run cool-retro-term with the default settings" << endl;
+        cout << "  --default-settings  Run cool-retro-term with the default settings" << '\n';
-        cout << "  --workdir <dir>     Change working directory to 'dir'" << endl;
+        cout << "  --workdir <dir>     Change working directory to 'dir'" << '\n';
-        cout << "  -e <cmd>            Command to execute. This option will catch all following arguments, so use it as the last option." << endl;
+        cout << "  -e <cmd>            Command to execute. This option will catch all following arguments, so use it as the last option." << '\n';
-        cout << "  -T <title>          Set window title to 'title'." << endl;
+        cout << "  -T <title>          Set window title to 'title'." << '\n';
-        cout << "  --fullscreen        Run cool-retro-term in fullscreen." << endl;
+        cout << "  --fullscreen        Run cool-retro-term in fullscreen." << '\n';
-        cout << "  -p|--profile <prof> Run cool-retro-term with the given profile." << endl;
+        cout << "  -p|--profile <prof> Run cool-retro-term with the given profile." << '\n';
-        cout << "  -h|--help           Print this help." << endl;
+        cout << "  -h|--help           Print this help." << '\n';
-        cout << "  --verbose           Print additional information such as profiles and settings." << endl;
+        cout << "  --verbose           Print additional information such as profiles and settings." << '\n';
         return 0;
     }
 
@@ -65,7 +65,7 @@ int main(int argc, char *argv[])
 
     if (argc>1 && (!strcmp(argv[1],"-v") || !strcmp(argv[1],"--version"))) {
         QTextStream cout(stdout, QIODevice::WriteOnly);
-        cout << "cool-retro-term " << appVersion << endl;
+        cout << "cool-retro-term " << appVersion << '\n';
         return 0;
     }
 

app/qml/ApplicationSettings.qml

@@ -32,7 +32,7 @@ QtObject {
     readonly property real maximumFontScaling: 2.50
 
     readonly property real minBurnInFadeTime: 160
-    readonly property real maxBurnInFadeTime: 1600
+    readonly property real maxBurnInFadeTime: 160000
 
     property bool isMacOS: Qt.platform.os === "osx"
 
@@ -632,7 +632,7 @@ QtObject {
             builtin: true
         }
         ListElement {
-            text: "IBM Dos"
+            text: "IBM DOS"
             obj_string: '{
                 "ambientLight": 0.151,
                 "backgroundColor": "#000000",

app/qml/BurnInEffect.qml

@@ -29,8 +29,8 @@ Loader {
     property real lastUpdate: 0
     property real prevLastUpdate: 0
 
-    property real burnIn: appSettings.burnIn
+    property real burnIn: appSettings.burnIn;
-    property real burnInFadeTime: 1 / Utils.lint(_minBurnInFadeTime, _maxBurnInFadeTime, burnIn)
+    property real burnInFadeTime: (1 / Utils.lint(_minBurnInFadeTime, _maxBurnInFadeTime, burnIn))*64
     property real _minBurnInFadeTime: appSettings.minBurnInFadeTime
     property real _maxBurnInFadeTime: appSettings.maxBurnInFadeTime
 
@@ -146,9 +146,8 @@ Loader {
                     float prevMask = accColor.a;
                     float currMask = rgb2grey(txtColor);
 
-                    highp float blurDecay = clamp((lastUpdate - prevLastUpdate) * burnInTime, 0.0, 1.0);
+                    highp float blurDecay = clamp(pow(0.5, burnInTime * (lastUpdate - prevLastUpdate)), 0.0, 1.0);
-                    blurDecay = max(0.0, blurDecay - prevMask);
+                    vec3 blurColor = accColor.rgb * vec3(blurDecay);
-                    vec3 blurColor = accColor.rgb - vec3(blurDecay);
                     vec3 color = max(blurColor, txtColor);
 
                     gl_FragColor = vec4(color, currMask);

app/qml/ShaderTerminal.qml

@@ -247,6 +247,17 @@ Item {
              "  return outColor;
              }" +
 
+             //pseudo-random vector
+             //https://stackoverflow.com/a/10625698
+             "float random( vec2 p )
+             {
+                 vec2 K1 = vec2(
+                     23.14069263277926, // e^pi (Gelfond's constant)
+                     2.665144142690225 // 2^sqrt(2) (Gelfond-Schneider constant)
+                 );
+                 return fract( cos( dot(p,K1) ) * 12345.6789 );
+             }" +
+
              "void main() {" +
                  "vec2 cc = vec2(0.5) - qt_TexCoord0;" +
                  "float distance = length(cc);" +
@@ -285,7 +296,11 @@ Item {
                  : "") +
 
                  (jitter !== 0 || staticNoise !== 0 ?
-                     "vec4 noiseTexel = texture2D(noiseSource, scaleNoiseSize * coords + vec2(fract(time / 51.0), fract(time / 237.0)));"
+                 "vec4 noiseTexel = texture2D(
+                     noiseSource, scaleNoiseSize * coords
+                     + vec2(0.0, random(vec2(fract(time / 237.0), 822.9582)))
+                     + vec2(fract(time / 31.0), fract(time / 177.0))
+                 );"
                  : "") +
 
                  (jitter !== 0 ? "
@@ -306,8 +321,8 @@ Item {
 
                  (burnIn !== 0 ? "
                      vec4 txt_blur = texture2D(burnInSource, staticCoords);
-                     float blurDecay = clamp((time - burnInLastUpdate) * burnInTime, 0.0, 1.0);
+                     float blurDecay = clamp(pow(0.5, burnInTime * (time - burnInLastUpdate)), 0.0, 1.0);
-                     vec3 burnInColor = 0.65 * (txt_blur.rgb - vec3(blurDecay));
+                     vec3 burnInColor = txt_blur.rgb * vec3(blurDecay);
                      txt_color = max(txt_color, convertWithChroma(burnInColor));"
                  : "") +
 

app/qml/TerminalFrame.qml

@@ -87,7 +87,7 @@ ShaderEffect {
             float alpha = 0.0;
 
             float frameShadow = max2(positiveLog(-coords * frameShadowCoeff + vec2(1.0)) + positiveLog(coords * frameShadowCoeff - (vec2(frameShadowCoeff) - vec2(1.0))));
-            frameShadow = max(sqrt(frameShadow), 0.0);
+            frameShadow = clamp(sqrt(frameShadow), 0.0, 1.0);
             color *= frameShadow;
             alpha = sum2(1.0 - step(vec2(0.0), coords) + step(vec2(1.0), coords));
             alpha = clamp(alpha, 0.0, 1.0);

cool-retro-term.pro

@@ -5,7 +5,17 @@ CONFIG += ordered
 SUBDIRS += qmltermwidget
 SUBDIRS += app
 
+#########################################
+##              INSTALLS
+#########################################
+
+PREFIX = $$(PREFIX) # Pass the make install PREFIX via environment variable. E.g. "PREFIX=/path/to/my/dir qmake".
+isEmpty(PREFIX) {
+    message(No prefix given. Using /usr.)
+    PREFIX=/usr
+}
+
 desktop.files += cool-retro-term.desktop
-desktop.path += /usr/share/applications
+desktop.path += $$PREFIX/share/applications
 
 INSTALLS += desktop