From f62550e115f2962ab21f3d3ed5aea524c125c4e4 Mon Sep 17 00:00:00 2001
From: Thorsten Renk <thorsten.i.renk@jyu.fi>
Date: Mon, 22 Apr 2013 11:32:28 +0300
Subject: [PATCH] Optional overlay texture for models

---
 Effects/model-combined.eff         | 72 +++++++++++++++++++++++-------
 Shaders/ubershader-lightfield.frag | 19 ++++++--
 2 files changed, 73 insertions(+), 18 deletions(-)

diff --git a/Effects/model-combined.eff b/Effects/model-combined.eff
index bc2b8e134..175c1d3e7 100644
--- a/Effects/model-combined.eff
+++ b/Effects/model-combined.eff
@@ -89,6 +89,17 @@ please see Docs/README.model-combined.eff for documentation
 		</texture>
 		<reflection-noise type="float">0.25</reflection-noise>
 		<!-- END Reflection -->
+		<!-- grain texture -->
+		<grain-texture-enabled type="int">0</grain-texture-enabled>
+		<grain-magnification type="float">10</grain-magnification>
+		<texture n="14">
+			<image>Textures/Terrain/void.png</image>
+			<filter>linear-mipmap-linear</filter>
+			<wrap-s>repeat</wrap-s>
+			<wrap-t>repeat</wrap-t>
+			<internal-format>normalized</internal-format>
+		</texture>
+		<!-- END Grain texture -->
 		<!-- 		Dirt -->
 		<dirt-enabled type="int">0</dirt-enabled>
 		<dirt-multi type="int">0</dirt-multi>
@@ -348,7 +359,7 @@ please see Docs/README.model-combined.eff for documentation
 				   </internal-format>
 			   </texture-unit>
 			   <!-- Reflection rainbow texture unit-->
-			   <texture-unit>
+			   <!--<texture-unit>
 				   <unit>7</unit>
 				   <image>
 					   <use>texture[7]/image</use>
@@ -365,26 +376,35 @@ please see Docs/README.model-combined.eff for documentation
 				   <internal-format>
 					   <use>texture[7]/internal-format</use>
 				   </internal-format>
-			   </texture-unit>
+			   </texture-unit>-->
 			   
+			   <!-- Grain texture -->
+		  	   <texture-unit>
+				   <unit>7</unit>
+				   <image>
+			 	   	<use>texture[14]/image</use>
+				   </image>
+				   <filter>
+			 		<use>texture[14]/filter</use>
+				   </filter>
+				   <wrap-s>
+			   		<use>texture[14]/wrap-s</use>
+				   </wrap-s>
+				   <wrap-t>
+			 		<use>texture[14]/wrap-t</use>
+				   </wrap-t>
+				   <internal-format>
+			  		<use>texture[14]/internal-format</use>
+				   </internal-format>
+		  	   </texture-unit>
 			   
 			   <vertex-program-two-side>
 				   <use>vertex-program-two-side</use>
 			   </vertex-program-two-side>
 			   
 			   <program>
-				   <!-- <vertex-shader n="0">Shaders/include_fog.vert</vertex-shader> -->
 					   <vertex-shader n="1">Shaders/ubershader.vert</vertex-shader>
-<!-- 					   <fragment-shader n="0">Shaders/include_fog.frag</fragment-shader> -->
 					   <fragment-shader n="1">Shaders/ubershader-lightfield.frag</fragment-shader>
-					   <!--<attribute>
-					   <name>tangent</name>
-					   <index>6</index>
-				   </attribute>
-				   <attribute>
-					   <name>binormal</name>
-					   <index>7</index>
-				   </attribute>-->
 			   </program>
 			   
 			   <uniform>
@@ -429,13 +449,17 @@ please see Docs/README.model-combined.eff for documentation
 				   <value type="int">6</value>
 			   </uniform>
 			   
-			   <uniform>
+			   <!--<uniform>
 				   <name>ReflRainbowTex</name>
 				   <type>sampler-2d</type>
 				   <value type="int">7</value>
-			   </uniform>
-			   
+			   </uniform>-->
 			   
+			   <uniform>
+				   <name>GrainTex</name>
+				   <type>sampler-2d</type>
+				   <value type="int">7</value>
+		 	   </uniform>
 			   
 			   <!-- 			NORMAL MAP -->
 			   <!-- normalmap is used-->
@@ -672,6 +696,24 @@ please see Docs/README.model-combined.eff for documentation
 				   </value>
 			   </uniform>
 			   
+
+			   <!-- use a grain texture map-->
+		  	   <uniform>
+				   <name>grain_texture_enabled</name>
+				   <type>int</type>
+				   <value>
+			  	   	<use>grain-texture-enabled</use>
+				   </value>
+		  	   </uniform>
+		  
+		  	   <uniform>
+				   <name>grain_magnification</name>
+				   <type>float</type>
+				   <value>
+			  		<use>grain-magnification</use>
+				   </value>
+		  	   </uniform>
+
 			   <!-- set the amount of ambient light correction 0.0 - 1.0  -->
 			   <uniform>
 				   <name>amb_correction</name>
diff --git a/Shaders/ubershader-lightfield.frag b/Shaders/ubershader-lightfield.frag
index 210c37326..eed09f3d1 100644
--- a/Shaders/ubershader-lightfield.frag
+++ b/Shaders/ubershader-lightfield.frag
@@ -22,9 +22,10 @@ uniform sampler2D LightMapTex;
 uniform sampler2D NormalTex;
 uniform sampler2D ReflFresnelTex;
 uniform sampler2D ReflMapTex;
-uniform sampler2D ReflRainbowTex;
+//uniform sampler2D ReflRainbowTex;
 uniform sampler3D ReflNoiseTex;
 uniform samplerCube Environment;
+uniform sampler2D GrainTex;
 
 uniform int dirt_enabled;
 uniform int dirt_multi;
@@ -35,6 +36,7 @@ uniform int nmap_enabled;
 uniform int refl_enabled;
 uniform int refl_map;
 uniform int shader_qual;
+uniform int grain_texture_enabled;
 
 uniform float amb_correction;
 uniform float dirt_b_factor;
@@ -49,6 +51,7 @@ uniform float refl_correction;
 uniform float refl_fresnel;
 uniform float refl_noise;
 uniform float refl_rainbow;
+uniform float grain_magnification;
 
 
 uniform float avisibility;			
@@ -116,6 +119,8 @@ void main (void)
 	vec4 noisevec   = texture3D(ReflNoiseTex, rawpos.xyz);
 	vec4 lightmapTexel = texture2D(LightMapTex, gl_TexCoord[0].st);
 
+	vec4 grainTexel; 
+
 	vec3 mixedcolor;
 	vec3 N = vec3(0.0,0.0,1.0);
 	float pf = 0.0;
@@ -203,6 +208,14 @@ void main (void)
 
 /// END light	
 	
+/// BEGIN grain overlay
+	if (grain_texture_enabled > 0)
+		{
+		grainTexel = texture2D(GrainTex, gl_TexCoord[0].st * grain_magnification);
+		texel.rgb = mix(texel.rgb, grainTexel.rgb,  grainTexel.a );
+		}
+/// END grain overlay	
+
 ///BEGIN bump
  	if (nmap_enabled > 0 && shader_qual > 2){
 	N = nmap.rgb * 2.0 - 1.0;
@@ -217,7 +230,7 @@ void main (void)
 	vec3 viewVec = normalize(vViewVec);
 	float v      = abs(dot(viewVec, normalize(VNormal)));// Map a rainbowish color
 	vec4 fresnel = texture2D(ReflFresnelTex, vec2(v, 0.0));
-	vec4 rainbow = texture2D(ReflRainbowTex, vec2(v, 0.0));
+	//vec4 rainbow = texture2D(ReflRainbowTex, vec2(v, 0.0));
 
 	float nDotVP = max(0.0, dot(N, normalize(gl_LightSource[0].position.xyz)));
 	float nDotHV = max(0.0, dot(N, normalize(gl_LightSource[0].halfVector.xyz)));
@@ -262,7 +275,7 @@ void main (void)
 		reflFactor = clamp(reflFactor, 0.0, 1.0);
 
 		// add fringing fresnel and rainbow effects and modulate by reflection
-		vec4 reflcolor = mix(reflection, rainbow, refl_rainbow * v);
+		vec4 reflcolor = reflection;//mix(reflection, rainbow, refl_rainbow * v);
 		reflcolor += Specular * nmap.a;
 		vec4 reflfrescolor = mix(reflcolor, fresnel, refl_fresnel  * v);
 		vec4 noisecolor = mix(reflfrescolor, noisevec, refl_noise);