HDR: Port chrome.eff

Effects/chrome.eff

@@ -64,4 +64,29 @@
       </texture-unit>
     </pass>
   </technique>
+
+  <technique n="109">
+    <scheme>hdr-geometry</scheme>
+    <pass>
+      <!-- Reverse floating point depth buffer -->
+      <depth>
+        <function>gequal</function>
+        <near>1.0</near>
+        <far>0.0</far>
+      </depth>
+      <stencil>
+        <function>always</function>
+        <value>8</value>
+        <pass>replace</pass>
+      </stencil>
+      <blend>0</blend>
+      <rendering-hint>opaque</rendering-hint>
+      <cull-face><use>cull-face</use></cull-face>
+      <program>
+        <vertex-shader>Shaders/HDR/geometry-chrome.vert</vertex-shader>
+        <fragment-shader>Shaders/HDR/geometry-chrome.frag</fragment-shader>
+        <fragment-shader>Shaders/HDR/gbuffer-include.frag</fragment-shader>
+      </program>
+    </pass>
+  </technique>
 </PropertyList>

Shaders/HDR/geometry-chrome.frag

@@ -0,0 +1,16 @@
+#version 330 core
+
+layout(location = 0) out vec4 gbuffer0;
+layout(location = 1) out vec2 gbuffer1;
+layout(location = 2) out vec4 gbuffer2;
+
+in vec3 normalVS;
+
+vec2 encodeNormal(vec3 n);
+
+void main()
+{
+    gbuffer0 = vec4(1.0);
+    gbuffer1 = encodeNormal(normalVS);
+    gbuffer2 = vec4(1.0, 0.1, 0.0, 0.0);
+}

Shaders/HDR/geometry-chrome.vert

@@ -0,0 +1,15 @@
+#version 330 core
+
+layout(location = 0) in vec4 pos;
+layout(location = 1) in vec3 normal;
+
+out vec3 normalVS;
+
+uniform mat4 osg_ModelViewProjectionMatrix;
+uniform mat3 osg_NormalMatrix;
+
+void main()
+{
+    gl_Position = osg_ModelViewProjectionMatrix * pos;
+    normalVS = normalize(osg_NormalMatrix * normal);
+}