Change normal encoding method to get rid of RG16 textures and buffers

Effects/fog.eff

@@ -34,6 +34,7 @@
 			<program>
 				<vertex-shader>Shaders/fog.vert</vertex-shader>
 				<fragment-shader>Shaders/fog.frag</fragment-shader>
+				<fragment-shader>Shaders/gbuffer-functions.frag</fragment-shader>
 			</program>
 			<uniform>
 				<name>depth_tex</name>

Effects/light-point.eff

@@ -36,6 +36,7 @@
 			<program>
 				<vertex-shader>Shaders/light-spot.vert</vertex-shader>
 				<fragment-shader>Shaders/light-point.frag</fragment-shader>
+				<fragment-shader>Shaders/gbuffer-functions.frag</fragment-shader>
 				<attribute>
 					<name>attenuation</name>
 					<index>12</index>

Effects/light-spot.eff

@@ -36,6 +36,7 @@
 			<program>
 				<vertex-shader>Shaders/light-spot.vert</vertex-shader>
 				<fragment-shader>Shaders/light-spot.frag</fragment-shader>
+				<fragment-shader>Shaders/gbuffer-functions.frag</fragment-shader>
 				<attribute>
 					<name>attenuation</name>
 					<index>12</index>

Effects/model-combined-deferred.eff

@@ -26,7 +26,6 @@ the objects that use it, and replaces it with the default shader.
 		  </and>
 		</or>
 		<extension-supported>GL_EXT_gpu_shader4</extension-supported>
-		<extension-supported>GL_ARB_texture_rg</extension-supported>
 	  </and>
 	</predicate>
 	<pass>
@@ -51,8 +50,9 @@ the objects that use it, and replaces it with the default shader.
 	  </material>
 	  <cull-face>back</cull-face>
 	  <program>
-		<vertex-shader n="1">Shaders/ubershader.vert</vertex-shader>
-		<fragment-shader n="1">Shaders/ubershader-gbuffer.frag</fragment-shader>
+		<vertex-shader>Shaders/ubershader.vert</vertex-shader>
+		<fragment-shader>Shaders/ubershader-gbuffer.frag</fragment-shader>
+		<fragment-shader>Shaders/gbuffer-functions.frag</fragment-shader>
 <!--		<vertex-shader n="1">Shaders/deferred-gbuffer.vert</vertex-shader>
 		<fragment-shader n="1">Shaders/deferred-gbuffer.frag</fragment-shader>-->
 	  </program>

Effects/model-default.eff

@@ -149,7 +149,6 @@
 				</and>
 			</or>
 			<extension-supported>GL_EXT_gpu_shader4</extension-supported>
-			<extension-supported>GL_ARB_texture_rg</extension-supported>
 		</and>
 	</predicate>
 	<pass>
@@ -189,6 +188,7 @@
 		<program>
 			<vertex-shader>Shaders/deferred-gbuffer.vert</vertex-shader>
 			<fragment-shader>Shaders/deferred-gbuffer.frag</fragment-shader>
+			<fragment-shader>Shaders/gbuffer-functions.frag</fragment-shader>
 		</program>
 		<uniform>
 			<name>texture</name>

Effects/sunlight.eff

@@ -41,6 +41,7 @@
 			<program>
 				<vertex-shader>Shaders/sunlight.vert</vertex-shader>
 				<fragment-shader>Shaders/sunlight.frag</fragment-shader>
+				<fragment-shader>Shaders/gbuffer-functions.frag</fragment-shader>
 			</program>
 			<uniform>
 				<name>depth_tex</name>

Effects/terrain-default.eff

@@ -212,7 +212,6 @@
 				</and>
 			</or>
 			<extension-supported>GL_EXT_gpu_shader4</extension-supported>
-			<extension-supported>GL_ARB_texture_rg</extension-supported>
 		</and>
 	</predicate>
 	<pass>
@@ -249,6 +248,7 @@
 		<program>
 			<vertex-shader>Shaders/deferred-gbuffer.vert</vertex-shader>
 			<fragment-shader>Shaders/deferred-gbuffer.frag</fragment-shader>
+			<fragment-shader>Shaders/gbuffer-functions.frag</fragment-shader>
 		</program>
 		<uniform>
 			<name>texture</name>

Effects/urban.eff

@@ -152,8 +152,9 @@
 				<type>noise</type>
 			</texture-unit>
 			<program>
-				<vertex-shader n="1">Shaders/urban-gbuffer.vert</vertex-shader>
-				<fragment-shader n="1">Shaders/urban-gbuffer.frag</fragment-shader>
+				<vertex-shader>Shaders/urban-gbuffer.vert</vertex-shader>
+				<fragment-shader>Shaders/urban-gbuffer.frag</fragment-shader>
+				<fragment-shader>Shaders/gbuffer-functions.frag</fragment-shader>
 				<attribute>
 					<name>tangent</name>
 					<index>6</index>
@@ -313,6 +314,7 @@
 			<program>
 				<vertex-shader>Shaders/urban-gbuffer.vert</vertex-shader>
 				<fragment-shader>Shaders/urban-gbuffer.frag</fragment-shader>
+				<fragment-shader>Shaders/gbuffer-functions.frag</fragment-shader>
 				<attribute>
 					<name>tangent</name>
 					<index>6</index>

Shaders/deferred-gbuffer.frag

@@ -8,6 +8,9 @@ varying vec3 ecNormal;
 varying float alpha;
 uniform int materialID;
 uniform sampler2D texture;
+
+vec2 normal_encode(vec3 n);
+
 void main() {
     vec4 texel = texture2D(texture, gl_TexCoord[0].st);
     if (texel.a * alpha < 0.1)
@@ -17,7 +20,7 @@ void main() {
     float emission = dot( gl_FrontLightModelProduct.sceneColor.rgb, vec3( 0.3, 0.59, 0.11 ) );
     
 	vec3 normal2 = normalize( (2.0 * gl_Color.a - 1.0) * ecNormal );
-    gl_FragData[0] = vec4( (normal2.xy + vec2(1.0,1.0)) * 0.5, 0.0, 1.0 );
+    gl_FragData[0] = vec4( normal_encode(normal2), 0.0, 1.0 );
     gl_FragData[1] = vec4( gl_Color.rgb * texel.rgb, float( materialID ) / 255.0 );
-    gl_FragData[2] = vec4( specular, shininess / 255.0, emission, 1.0 );
+    gl_FragData[2] = vec4( specular, shininess / 128.0, emission, 1.0 );
 }

Shaders/fog.frag

@@ -6,6 +6,9 @@ uniform vec4 fg_FogColor;
 uniform float fg_FogDensity;
 uniform vec3 fg_Planes;
 varying vec3 ray;
+
+vec3 position( vec3 viewdir, float depth );
+
 void main() {
     vec2 coords = gl_TexCoord[0].xy;
     float initialized = texture2D( spec_emis_tex, coords ).a;
@@ -16,11 +19,7 @@ void main() {
     normal.z = sqrt( 1.0 - dot( normal.xy, normal.xy ) );
     float len = length(normal);
     normal /= len;
-    vec3 viewDir = normalize(ray);
-    float depth = texture2D( depth_tex, coords ).r;
-    vec3 pos;
-    pos.z = - fg_Planes.y / (fg_Planes.x + depth * fg_Planes.z);
-    pos.xy = viewDir.xy / viewDir.z * pos.z;
+    vec3 pos = position( normalize(ray), texture2D( depth_tex, coords ).r );
 
     float fogFactor = 0.0;
     const float LOG2 = 1.442695;

Shaders/gbuffer-functions.frag

@@ -0,0 +1,28 @@
+uniform vec3 fg_Planes;
+
+// normal compression functions from 
+//   http://aras-p.info/texts/CompactNormalStorage.html#method04spheremap
+vec2 normal_encode(vec3 n)
+{
+    float p = sqrt(n.z * 8.0 + 8.0);
+    return n.xy / p + 0.5;
+}
+
+vec3 normal_decode(vec2 enc)
+{
+    vec2 fenc = enc * 4.0 - 2.0;
+    float f = dot(fenc,fenc);
+    float g = sqrt(1.0 - f / 4.0);
+    vec3 n;
+    n.xy = fenc * g;
+    n.z = 1.0 - f / 2.0;
+    return n;
+}
+
+vec3 position( vec3 viewDir, float depth )
+{
+    vec3 pos;
+    pos.z = - fg_Planes.y / (fg_Planes.x + depth * fg_Planes.z);
+    pos.xy = viewDir.xy / viewDir.z * pos.z;
+	return pos;
+}

Shaders/light-point.frag

@@ -15,21 +15,19 @@ uniform float Far;
 
 varying vec4 ecPosition;
 
+vec3 position( vec3 viewdir, float depth );
+vec3 normal_decode(vec2 enc);
+
 void main() {
 	vec3 ray = ecPosition.xyz / ecPosition.w;
 	vec3 ecPos3 = ray;
     vec3 viewDir = normalize(ray);
 	vec2 coords = gl_FragCoord.xy / fg_BufferSize;
 	
-    float depth = texture2D( depth_tex, coords ).r;
-	vec3 normal;
-	normal.xy = texture2D( normal_tex, coords ).rg * 2.0 - vec2(1.0,1.0);
-	normal.z = sqrt( 1.0 - dot( normal.xy, normal.xy ) );
+	vec3 normal = normal_decode(texture2D( normal_tex, coords ).rg);
 	vec4 spec_emis = texture2D( spec_emis_tex, coords );
 	
-    vec3 pos;
-    pos.z = - fg_Planes.y / (fg_Planes.x + depth * fg_Planes.z);
-    pos.xy = viewDir.xy * pos.z / viewDir.z;
+    vec3 pos = position(viewDir, texture2D( depth_tex, coords ).r);
 	
 	if ( pos.z < ecPos3.z ) // Negative direction in z
 		discard; // Don't light surface outside the light volume

Shaders/light-spot.frag

@@ -19,21 +19,19 @@ uniform float Far;
 
 varying vec4 ecPosition;
 
+vec3 position( vec3 viewdir, float depth );
+vec3 normal_decode(vec2 enc);
+
 void main() {
 	vec3 ray = ecPosition.xyz / ecPosition.w;
 	vec3 ecPos3 = ray;
     vec3 viewDir = normalize(ray);
 	vec2 coords = gl_FragCoord.xy / fg_BufferSize;
 	
-    float depth = texture2D( depth_tex, coords ).r;
-	vec3 normal;
-	normal.xy = texture2D( normal_tex, coords ).rg * 2.0 - vec2(1.0,1.0);
-	normal.z = sqrt( 1.0 - dot( normal.xy, normal.xy ) );
+	vec3 normal = normal_decode(texture2D( normal_tex, coords ).rg);
 	vec4 spec_emis = texture2D( spec_emis_tex, coords );
 	
-    vec3 pos;
-    pos.z = - fg_Planes.y / (fg_Planes.x + depth * fg_Planes.z);
-    pos.xy = viewDir.xy * pos.z / viewDir.z;
+    vec3 pos = position(viewDir, texture2D( depth_tex, coords ).r);
 
 	if ( pos.z < ecPos3.z ) // Negative direction in z
 		discard; // Don't light surface outside the light volume

Shaders/sunlight.frag

@@ -9,6 +9,10 @@ uniform vec4 fg_SunSpecularColor;
 uniform vec3 fg_SunDirection;
 uniform vec3 fg_Planes;
 varying vec3 ray;
+
+vec3 position( vec3 viewdir, float depth );
+vec3 normal_decode(vec2 enc);
+
 vec4 DynamicShadow( in vec4 ecPosition, out vec4 tint )
 {
     vec4 coords;
@@ -44,16 +48,11 @@ void main() {
     vec4 spec_emis = texture2D( spec_emis_tex, coords );
     if ( spec_emis.a < 0.1 )
         discard;
-    vec3 normal;
-    normal.xy = texture2D( normal_tex, coords ).rg * 2.0 - vec2(1.0,1.0);
-    normal.z = sqrt( 1.0 - dot( normal.xy, normal.xy ) );
+    vec3 normal = normal_decode(texture2D( normal_tex, coords ).rg);
     float len = length(normal);
     normal /= len;
     vec3 viewDir = normalize(ray);
-    float depth = texture2D( depth_tex, coords ).r;
-    vec3 pos;
-    pos.z = - fg_Planes.y / (fg_Planes.x + depth * fg_Planes.z);
-    pos.xy = viewDir.xy / viewDir.z * pos.z;
+    vec3 pos = position( viewDir, texture2D( depth_tex, coords ).r );
 
     vec4 tint;
 #if 0
@@ -86,7 +85,7 @@ void main() {
     vec3 Iemis = spec_emis.z * color;
     if (len > 0.0001) {
         halfDir /= len;
-        Ispec = pow( clamp( dot( halfDir, normal ), 0.0, 1.0 ), spec_emis.y * 255.0 ) * spec_emis.x * fg_SunSpecularColor.rgb;
+        Ispec = pow( clamp( dot( halfDir, normal ), 0.0, 1.0 ), spec_emis.y * 128.0 ) * spec_emis.x * fg_SunSpecularColor.rgb;
     }
     gl_FragColor = vec4(mix(vec3(0.0), Idiff + Ispec, shadow) + Iemis, 1.0);
 //    gl_FragColor = mix(tint, vec4(mix(vec3(0.0), Idiff + Ispec, shadow) + Iemis, 1.0), 0.92);

Shaders/ubershader-gbuffer.frag

@@ -56,6 +56,7 @@ uniform vec3 dirt_g_color;
 uniform vec3 dirt_b_color;
 
 //uniform vec4 fg_SunAmbientColor;
+vec2 normal_encode(vec3 n);
 
 ///fog include//////////////////////
 uniform int fogType;
@@ -87,7 +88,6 @@ void main (void)
 	} else {
  		N = normalize(VNormal);
  	}
- 	vec2 eyeN = (N.xy + vec2(1.0,1.0))*0.5;
 ///END bump
 	vec4 reflection = textureCube(Environment, reflVec * N);
 	vec3 viewVec = normalize(vViewVec);
@@ -180,7 +180,7 @@ void main (void)
 // END lightmap
 /////////////////////////////////////////////////////////////////////
 
-	gl_FragData[0]=vec4(eyeN, 0.0, 1.0);
+	gl_FragData[0]=vec4(normal_encode(N), 0.0, 1.0);
 	gl_FragData[1]=vec4(fragColor.rgb,1.0/255.0);
-	gl_FragData[2]=vec4(specular, gl_FrontMaterial.shininess/255.0, emission, 1.0);
+	gl_FragData[2]=vec4(specular, gl_FrontMaterial.shininess/128.0, emission, 1.0);
 }

Shaders/urban-gbuffer.frag

@@ -37,6 +37,8 @@ int linear_search_steps = 10;
 int GlobalIterationCount = 0;
 int gIterationCap = 64;
 
+vec2 normal_encode(vec3 n);
+
 void QDM(inout vec3 p, inout vec3 v)
 {
     const int MAX_LEVEL = TEXTURE_MIP_LEVELS;
@@ -184,7 +186,7 @@ void main (void)
     N.z = sqrt(1.0 - min(1.0,dot(N.xy, N.xy)));
     float Nz = N.z;
     N = normalize(N.x * VTangent + N.y * VBinormal + N.z * VNormal);
-	gl_FragData[0] = vec4( (N.xy + vec2(1.0,1.0)) * 0.5, 0.0, 1.0 );
+	gl_FragData[0] = vec4( normal_encode(N), 0.0, 1.0 );
 
     vec4 ambient_light = constantColor + vec4(gl_Color.rgb, 1.0);