fgdata/Effects/stars.eff

<?xml version="1.0" encoding="utf-8"?>

<PropertyList>
  <name>Effects/stars</name>

  <parameters>
    <max-radiance type="float">50.0</max-radiance>
  </parameters>

  <!-- Fixed-pipeline fallback -->
  <technique n="11">
    <pass>
      <!--
          An empty pass should be fine as we are filling the stateset manually
          in simgear/scene/sky/stars.cxx
      -->
    </pass>
  </technique>

  <technique n="129">
    <scheme>hdr-forward</scheme>
    <pass>
      <!-- Disable depth testing -->
      <depth>
        <enabled>false</enabled>
      </depth>
      <!-- Only render the stars on top of the skydome -->
      <stencil>
        <function>equal</function>
        <value>0</value>
      </stencil>
      <!-- Make sure we render after the skydome -->
      <render-bin>
        <bin-number>-9</bin-number>
        <bin-name>RenderBin</bin-name>
      </render-bin>
      <cull-face>off</cull-face>
      <!-- Additive blending to add the sky in-scattering from the skydome -->
      <blend>
        <active>true</active>
        <source>one</source>
        <destination>one</destination>
      </blend>
      <program>
        <vertex-shader>Shaders/HDR/stars.vert</vertex-shader>
        <fragment-shader>Shaders/HDR/stars.frag</fragment-shader>
        <fragment-shader>Shaders/HDR/exposure.glsl</fragment-shader>
      </program>
      <uniform>
        <name>max_radiance</name>
        <type>float</type>
        <value><use>max-radiance</use></value>
      </uniform>
      <uniform>
        <name>transmittance_tex</name>
        <type>sampler-2d</type>
        <value type="int">12</value>
      </uniform>
      <!-- exposure.glsl -->
      <uniform>
        <name>lum_tex</name>
        <type>sampler-2d</type>
        <value type="int">14</value>
      </uniform>
      <uniform>
        <name>exposure_compensation</name>
        <type>float</type>
        <value><use>exposure-compensation</use></value>
      </uniform>
    </pass>
  </technique>
</PropertyList>