Night vision post processing effect in Rembrandt

Effects/display.eff

@@ -2,11 +2,17 @@
 <PropertyList>
 	<name>Effects/display</name>
 	<parameters>
-		<exposure type="float"><use>/sim/rendering/rembrandt/exposure</use></exposure>
 		<show-buffers type="bool"><use>/sim/rendering/rembrandt/show-buffers</use></show-buffers>
 		<bloom type="bool"><use>/sim/rendering/rembrandt/bloom</use></bloom>
 		<bloom-strength type="float"><use>/sim/rendering/rembrandt/bloom-strength</use></bloom-strength>
 		<bloom-buffers type="bool"><use>/sim/rendering/rembrandt/bloom-buffers</use></bloom-buffers>
+		<texture n="0">
+			<image>Textures\noise_tex.jpg</image>
+			<filter>linear-mipmap-linear</filter>
+			<wrap-s>repeat</wrap-s>
+			<wrap-t>repeat</wrap-t>
+			<internal-format>normalized</internal-format>
+		</texture>
 
 		<buffer-nw-enabled><use>/sim/rendering/rembrandt/debug-buffer[0]/enabled</use></buffer-nw-enabled>
 		<buffer-nw-name><use>/sim/rendering/rembrandt/debug-buffer[0]/name</use></buffer-nw-name>
@@ -17,6 +23,97 @@
 		<buffer-se-enabled><use>/sim/rendering/rembrandt/debug-buffer[3]/enabled</use></buffer-se-enabled>
 		<buffer-se-name><use>/sim/rendering/rembrandt/debug-buffer[3]/name</use></buffer-se-name>
 	</parameters>
+	<technique n="10">
+		<predicate>
+			<and>
+				<property>/sim/rendering/rembrandt/night-vision</property>
+				<equal>
+					<value type="float">0.0</value>
+					<float-property>/sim/rendering/rembrandt/show-buffers</float-property>
+				</equal>
+			</and>
+		</predicate>
+		<pass>
+			<render-bin>
+				<bin-number>99999</bin-number>
+				<bin-name>RenderBin</bin-name>
+			</render-bin>
+			<texture-unit>
+				<unit>0</unit>
+				<type>buffer</type>
+				<name>lighting</name>
+			</texture-unit>
+			<texture-unit>
+				<unit>1</unit>
+				<type>buffer</type>
+				<name>bloom-3</name>
+			</texture-unit>
+			<texture-unit>
+				<unit>2</unit>
+				<type>buffer</type>
+				<name>spec-emis</name>
+			</texture-unit>
+			<texture-unit>
+				<unit>3</unit>
+				<type>buffer</type>
+				<name>diffuse</name>
+			</texture-unit>
+			<texture-unit>
+				<unit>4</unit>
+				<image><use>texture[0]/image</use></image>
+				<filter><use>texture[0]/filter</use></filter>
+				<wrap-s><use>texture[0]/wrap-s</use></wrap-s>
+				<wrap-t><use>texture[0]/wrap-t</use></wrap-t>
+				<internal-format><use>texture[0]/internal-format</use></internal-format>
+			</texture-unit>
+
+			<program>
+				<vertex-shader>Shaders/fullscreen.vert</vertex-shader>
+				<fragment-shader>Shaders/night-vision.frag</fragment-shader>
+			</program>
+			<uniform>
+				<name>lighting_tex</name>
+				<type>sampler-2d</type>
+				<value type="int">0</value>
+			</uniform>
+			<uniform>
+				<name>bloom_tex</name>
+				<type>sampler-2d</type>
+				<value type="int">1</value>
+			</uniform>
+			<uniform>
+				<name>spec_emis_tex</name>
+				<type>sampler-2d</type>
+				<value type="int">2</value>
+			</uniform>
+			<uniform>
+				<name>color_tex</name>
+				<type>sampler-2d</type>
+				<value type="int">3</value>
+			</uniform>
+			<uniform>
+				<name>noise_tex</name>
+				<type>sampler-2d</type>
+				<value type="int">4</value>
+			</uniform>
+
+			<uniform>
+				<name>bloomEnabled</name>
+				<type>bool</type>
+				<value type="bool"><use>bloom</use></value>
+			</uniform>
+			<uniform>
+				<name>bloomStrength</name>
+				<type>float</type>
+				<value><use>bloom-strength</use></value>
+			</uniform>
+			<uniform>
+				<name>bloomBuffers</name>
+				<type>bool</type>
+				<value><use>bloom-buffers</use></value>
+			</uniform>
+		</pass>
+	</technique>
 	<technique n="11">
 		<pass>
 			<render-bin>
@@ -89,11 +186,6 @@
 				<type>sampler-2d</type>
 				<value type="int">5</value>
 			</uniform>
-			<uniform>
-				<name>exposure</name>
-				<type>float</type>
-				<value type="float"><use>exposure</use></value>
-			</uniform>
 			<uniform>
 				<name>showBuffers</name>
 				<type>bool</type>

Shaders/display.frag

@@ -6,7 +6,6 @@ uniform sampler2D bufferNE_tex;
 uniform sampler2D bufferSW_tex;
 uniform sampler2D bufferSE_tex;
 
-uniform float exposure;
 uniform bool showBuffers;
 
 uniform bool bloomEnabled;
@@ -18,14 +17,6 @@ uniform bool bufferNE_enabled;
 uniform bool bufferSW_enabled;
 uniform bool bufferSE_enabled;
 
-vec3 HDR(vec3 L) {
-    L = L * exposure;
-    L.r = L.r < 1.413 ? pow(L.r * 0.38317, 1.0 / 2.2) : 1.0 - exp(-L.r);
-    L.g = L.g < 1.413 ? pow(L.g * 0.38317, 1.0 / 2.2) : 1.0 - exp(-L.g);
-    L.b = L.b < 1.413 ? pow(L.b * 0.38317, 1.0 / 2.2) : 1.0 - exp(-L.b);
-    return L;
-}
-
 void main() {
     vec2 coords = gl_TexCoord[0].xy;
     vec4 color;
@@ -42,13 +33,11 @@ void main() {
             color = texture2D( lighting_tex, coords );
             if (bloomEnabled && bloomBuffers)
                 color = color + bloomStrength * texture2D( bloom_tex, coords );
-            //color = vec4( HDR( color.rgb ), 1.0 );
         }
     } else {
         color = texture2D( lighting_tex, coords );
         if (bloomEnabled && bloomBuffers)
             color = color + bloomStrength * texture2D( bloom_tex, coords );
-        //color = vec4( HDR( color.rgb ), 1.0 );
     }
     gl_FragColor = color;
 }

Shaders/night-vision.frag

@@ -0,0 +1,42 @@
+// Night vision effect inspired by http://www.geeks3d.com/20091009/shader-library-night-vision-post-processing-filter-glsl/
+
+uniform sampler2D color_tex;
+uniform sampler2D lighting_tex;
+uniform sampler2D bloom_tex;
+uniform sampler2D spec_emis_tex;
+uniform sampler2D noise_tex;
+
+uniform bool bloomEnabled;
+uniform float bloomStrength;
+uniform bool bloomBuffers;
+
+uniform vec2 fg_BufferSize;
+uniform float osg_SimulationTime;
+
+void main() {
+    vec2 coords = gl_TexCoord[0].xy;
+    vec4 color;
+	vec2 uv;           
+	uv.x = 0.4*sin(osg_SimulationTime*50.0);                                 
+	uv.y = 0.4*cos(osg_SimulationTime*50.0);
+	vec3 n = texture2D(noise_tex, (coords*3.5) + uv).rgb;
+	
+	vec2 c1 = coords + (n.xy*0.005);
+	color = texture2D( lighting_tex, c1 );
+	if (bloomEnabled && bloomBuffers)
+		color = color + bloomStrength * texture2D( bloom_tex, c1 );
+
+	float lum = dot(color.rgb, vec3(.3, .59, .11));
+	color.rgb *= (4.0 - 3.0*smoothstep(0.2, 0.3, lum));
+
+	// color.rgb += texture2D( spec_emis_tex, c1 ).b;
+	// color.rgb += texture2D( bloom_tex, c1 ).rgb;
+	color.rgb = (color.rgb + (n*0.2)) * vec3(0.1, 0.95, 0.2);
+
+	vec2 c = 2.0 * coords - vec2(1.,1.);
+	c = c * vec2( 1.0, fg_BufferSize.y / fg_BufferSize.x );
+	float l = length(c);
+	float f = smoothstep( 0.7, 1.1, l );
+	color.rgb = (1 - f) * color.rgb;
+    gl_FragColor = color;
+}

gui/dialogs/rembrandt.xml

@@ -377,6 +377,24 @@
 
 	<hrule/>
 
+	<group>
+		<layout>hbox</layout>
+		<halign>left</halign>
+
+		<checkbox>
+			<halign>left</halign>
+			<label>Night vision</label>
+			<name>night-vision</name>
+			<property>/sim/rendering/rembrandt/night-vision</property>
+			<binding>
+				<command>dialog-apply</command>
+				<object-name>night-vision</object-name>
+			</binding>
+		</checkbox>
+	</group>
+
+	<hrule/>
+
 	<group>
 		<layout>hbox</layout>
 

preferences.xml

@@ -72,6 +72,7 @@ Started September 2000 by David Megginson, david@megginson.com
 				<bloom type="bool" userarchive="y">true</bloom>
 				<bloom-strength type="float" userarchive="y">1.0</bloom-strength>
 				<bloom-buffers type="bool">true</bloom-buffers>
+				<night-vision type="bool">false</night-vision>
 				<exposure type="float" userarchive="y">1.0</exposure>
 				<use-color-for-depth type="bool">false</use-color-for-depth>
 				<no-16bit-buffer type="bool">true</no-16bit-buffer>