fgdata/Effects/tree.eff

<?xml version="1.0" encoding="utf-8"?>
<!-- Effects files for trees, which are placed by a shader. -->

<!-- Trees are drawn in two passes. The first draws the opaque parts
     with z writes enabled. The second draws the the transparent bits
     with z testing enabled and z writes disabled. The transparent
     tree silhouettes will blend correctly against the opaque
     geometry. They may cause artifacts when blending against other
     edges, but the overall "forest" is supposed to be nice and
     fuzzy. There might also be artifacts when blending over other
     transparent objects, but that's mostly unavoidable.

     Note: no sorting needed! -->
<PropertyList>
  <name>Effects/tree</name>
  <parameters>
    <texture n ="0">
    </texture>
  </parameters>
  <technique n="10">
    <predicate>
      <and>
	<property>/sim/rendering/random-vegetation</property>
        <less-equal>
          <value type="float">1.0</value>
          <shader-language/>
        </less-equal>
      </and>
    </predicate>
    <pass n="0">
      <lighting>true</lighting>
      <material>
        <ambient type="vec4d">1.0 1.0 1.0 1.0</ambient>
        <diffuse type="vec4d">1.0 1.0 1.0 1.0</diffuse>
        <color-mode>off</color-mode>
      </material>
      <alpha-test>
        <comparison>gequal</comparison>
        <reference type="float">0.33</reference>
      </alpha-test>
      <texture-unit>
        <unit>0</unit>
        <type>2d</type>
        <image><use>texture[0]/image</use></image>
        <wrap-s>clamp</wrap-s>
        <wrap-t>clamp</wrap-t>
      </texture-unit>
      <program>
        <vertex-shader>Shaders/tree.vert</vertex-shader>
        <fragment-shader>Shaders/tree.frag</fragment-shader>
      </program>
      <uniform>
        <name>baseTexture</name>
        <type>sampler-2d</type>
        <value type="int">0</value>
      </uniform>
    </pass>
    <pass n="1">
      <lighting>true</lighting>
      <material>
        <ambient type="vec4d">1.0 1.0 1.0 1.0</ambient>
        <diffuse type="vec4d">1.0 1.0 1.0 1.0</diffuse>
        <color-mode>off</color-mode>
      </material>
      <render-bin>
        <bin-number>2</bin-number> <!-- RANDOM_OBJECTS_BIN -->
        <bin-name>RenderBin</bin-name>
      </render-bin>
      <alpha-test>
        <comparison>less</comparison>
        <reference type="float">0.33</reference>
      </alpha-test>
      <blend>
        <source>src-alpha</source>
        <destination>one-minus-src-alpha</destination>
      </blend>
      <depth>
        <write-mask>false</write-mask>
      </depth>
      <texture-unit>
        <unit>0</unit>
        <type>2d</type>
        <image><use>texture[0]/image</use></image>
        <wrap-s>clamp</wrap-s>
        <wrap-t>clamp</wrap-t>
      </texture-unit>
      <program>
        <vertex-shader>Shaders/tree.vert</vertex-shader>
        <fragment-shader>Shaders/tree.frag</fragment-shader>
      </program>
      <uniform>
        <name>baseTexture</name>
        <type>sampler-2d</type>
        <value type="int">0</value>
      </uniform>
    </pass>
  </technique>
</PropertyList>