Add monochrome LCD shader

Cocoa/GBPreferencesWindow.m

@@ -32,6 +32,7 @@
                     @"NearestNeighbor",
                     @"Bilinear",
                     @"SmoothBilinear",
+                    @"MonoLCD",
                     @"LCD",
                     @"CRT",
                     @"Scale2x",

Cocoa/Preferences.xib

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="13771" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
+<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="14868" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
     <dependencies>
         <deployment identifier="macosx"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="13771"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="14868"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <objects>
@@ -17,7 +17,7 @@
         </customObject>
         <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
         <customObject id="-3" userLabel="Application" customClass="NSObject"/>
-        <window title="Preferences" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" oneShot="NO" releasedWhenClosed="NO" visibleAtLaunch="NO" animationBehavior="default" id="QvC-M9-y7g" customClass="GBPreferencesWindow">
+        <window title="Preferences" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" visibleAtLaunch="NO" animationBehavior="default" id="QvC-M9-y7g" customClass="GBPreferencesWindow">
             <windowStyleMask key="styleMask" titled="YES" closable="YES"/>
             <windowCollectionBehavior key="collectionBehavior" fullScreenAuxiliary="YES"/>
             <windowPositionMask key="initialPositionMask" leftStrut="YES" rightStrut="YES" topStrut="YES" bottomStrut="YES"/>
@@ -104,7 +104,8 @@
                                 </menuItem>
                                 <menuItem title="Bilinear (Blurry)" id="iDe-si-atu"/>
                                 <menuItem title="Smooth Bilinear (Less blurry)" id="1jN-pO-1iD"/>
-                                <menuItem title="LCD Display" id="b8u-LZ-UQf"/>
+                                <menuItem title="Monochrome LCD Display" id="b8u-LZ-UQf"/>
+                                <menuItem title="LCD Display" id="pj3-Jt-bNU"/>
                                 <menuItem title="CRT Display" id="FT9-FT-RZu"/>
                                 <menuItem title="Scale2x" id="C1I-L2-Up1"/>
                                 <menuItem title="Scale4x" id="uWA-Zp-JY9"/>
@@ -428,7 +429,7 @@
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <clipView key="contentView" focusRingType="none" ambiguous="YES" drawsBackground="NO" id="AMs-PO-nid">
                         <rect key="frame" x="1" y="1" width="238" height="209"/>
-                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <autoresizingMask key="autoresizingMask"/>
                         <subviews>
                             <tableView focusRingType="none" appearanceType="vibrantLight" verticalHuggingPriority="750" allowsExpansionToolTips="YES" columnAutoresizingStyle="lastColumnOnly" columnReordering="NO" columnResizing="NO" multipleSelection="NO" emptySelection="NO" autosaveColumns="NO" typeSelect="NO" id="UDd-IJ-fxX">
                                 <rect key="frame" x="0.0" y="0.0" width="238" height="209"/>
@@ -472,11 +473,11 @@
                         </subviews>
                         <nil key="backgroundColor"/>
                     </clipView>
-                    <scroller key="horizontalScroller" hidden="YES" verticalHuggingPriority="750" horizontal="YES" id="31h-at-Znm">
+                    <scroller key="horizontalScroller" hidden="YES" wantsLayer="YES" verticalHuggingPriority="750" horizontal="YES" id="31h-at-Znm">
                         <rect key="frame" x="-100" y="-100" width="210" height="16"/>
                         <autoresizingMask key="autoresizingMask"/>
                     </scroller>
-                    <scroller key="verticalScroller" hidden="YES" verticalHuggingPriority="750" horizontal="NO" id="JkP-U1-jdy">
+                    <scroller key="verticalScroller" hidden="YES" wantsLayer="YES" verticalHuggingPriority="750" horizontal="NO" id="JkP-U1-jdy">
                         <rect key="frame" x="-100" y="-100" width="15" height="102"/>
                         <autoresizingMask key="autoresizingMask"/>
                     </scroller>

SDL/gui.c

@@ -501,6 +501,7 @@ struct shader_name {
     {"NearestNeighbor", "Nearest Neighbor"},
     {"Bilinear", "Bilinear"},
     {"SmoothBilinear", "Smooth Bilinear"},
+    {"MonoLCD", "Monochrome LCD"},
     {"LCD", "LCD Display"},
     {"CRT", "CRT Display"},
     {"Scale2x", "Scale2x"},

Shaders/MonoLCD.fsh

@@ -0,0 +1,38 @@
+#define SCANLINE_DEPTH 0.25
+#define BLOOM 0.4
+
+STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
+{
+    vec2 pixel = position * input_resolution - vec2(0.5, 0.5);
+
+    vec4 q11 = texture(image, (floor(pixel) + 0.5) / input_resolution);
+    vec4 q12 = texture(image, (vec2(floor(pixel.x), ceil(pixel.y)) + 0.5) / input_resolution);
+    vec4 q21 = texture(image, (vec2(ceil(pixel.x), floor(pixel.y)) + 0.5) / input_resolution);
+    vec4 q22 = texture(image, (ceil(pixel) + 0.5) / input_resolution);
+
+    vec2 s = smoothstep(0., 1., fract(pixel));
+
+    vec4 r1 = mix(q11, q21, s.x);
+    vec4 r2 = mix(q12, q22, s.x);
+    
+    vec2 pos = fract(position * input_resolution);
+    vec2 sub_pos = fract(position * input_resolution * 6);
+
+    float multiplier = 1.0;
+    
+    if (pos.y < 1.0 / 6.0) {
+        multiplier *= sub_pos.y * SCANLINE_DEPTH + (1 - SCANLINE_DEPTH);
+    }
+    else if (pos.y > 5.0 / 6.0) {
+        multiplier *= (1.0 - sub_pos.y) * SCANLINE_DEPTH + (1 - SCANLINE_DEPTH);
+    }
+    
+    if (pos.x < 1.0 / 6.0) {
+        multiplier *= sub_pos.x * SCANLINE_DEPTH + (1 - SCANLINE_DEPTH);
+    }
+    else if (pos.x > 5.0 / 6.0) {
+        multiplier *= (1.0 - sub_pos.x) * SCANLINE_DEPTH + (1 - SCANLINE_DEPTH);
+    }
+
+    return mix(texture(image, position) * multiplier, mix(r1, r2, s.y), BLOOM);
+}