Add flutter effect for flags etc.
Signed-off-by: Vivian Meazza <vivian.meazza@lineone.net>
This commit is contained in:
Vivian Meazza
parent
759c8ded5a
commit
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2 changed files with 240 additions and 0 deletions
161
Effects/flutter.eff
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161
Effects/flutter.eff
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<?xml version="1.0" encoding="utf-8"?>
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<PropertyList>
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<name>Effects/flutter</name>
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<inherits-from>Effects/model-default</inherits-from>
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<parameters>
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<vertex-program-two-side type="bool">true</vertex-program-two-side>
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<material>
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<color-mode-uniform>1</color-mode-uniform>
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<!-- DIFFUSE -->
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</material>
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<shade-model>smooth</shade-model>
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<wind-speed>
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<!--<use>/environment/Vinson/rel-wind-speed-kts</use>-->
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<use>/environment/config/boundary/entry[0]/wind-speed-kt</use>
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</wind-speed>
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<offset>0.0</offset>
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<amplitude-factor>0.08</amplitude-factor>
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</parameters>
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<technique n="9">
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<predicate>
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<and>
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<property>/sim/rendering/shader-effects</property>
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<or>
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<less-equal>
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<value type="float">2.0</value>
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<glversion/>
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</less-equal>
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<and>
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<extension-supported>GL_ARB_shader_objects</extension-supported>
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<extension-supported>GL_ARB_shading_language_100</extension-supported>
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<extension-supported>GL_ARB_vertex_shader</extension-supported>
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<extension-supported>GL_ARB_fragment_shader</extension-supported>
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</and>
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</or>
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</and>
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</predicate>
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<pass>
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<lighting>true</lighting>
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<material>
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<active>
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<use>material/active</use>
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</active>
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<ambient>
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<use>material/ambient</use>
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</ambient>
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<diffuse>
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<use>material/diffuse</use>
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</diffuse>
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<specular>
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<use>material/specular</use>
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</specular>
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<emissive>
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<use>material/emissive</use>
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</emissive>
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<shininess>
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<use>material/shininess</use>
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</shininess>
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<color-mode>
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<use>material/color-mode</use>
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</color-mode>
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</material>
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<blend>
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<active>
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<use>blend/active</use>
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</active>
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<source>
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<use>blend/source</use>
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</source>
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<destination>
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<use>blend/destination</use>
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</destination>
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</blend>
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<shade-model>
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<use>shade-model</use>
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</shade-model>
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<cull-face>
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<use>cull-face</use>
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</cull-face>
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<rendering-hint>
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<use>rendering-hint</use>
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</rendering-hint>
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<texture-unit>
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<!-- The texture unit is always active because the shaders expect
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that. -->
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<unit>0</unit>
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<!-- If there is a texture, the type in the derived effect
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will be "2d". -->
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<type>
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<use>texture[0]/type</use>
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</type>
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<image>
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<use>texture[0]/image</use>
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</image>
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<filter>
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<use>texture[0]/filter</use>
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</filter>
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<wrap-s>
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<use>texture[0]/wrap-s</use>
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</wrap-s>
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<wrap-t>
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<use>texture[0]/wrap-t</use>
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</wrap-t>
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<!--
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<internal-format>
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<use>texture[0]/internal-format</use>
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</internal-format>
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-->
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</texture-unit>
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<texture-unit>
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<unit>9</unit>
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<type>noise</type>
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</texture-unit>
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<vertex-program-two-side>
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<use>vertex-program-two-side</use>
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</vertex-program-two-side>
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<program>
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<vertex-shader>Shaders/flutter.vert</vertex-shader>
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<fragment-shader>Shaders/default.frag</fragment-shader>
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</program>
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<!--<uniform>
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<name>texture</name>
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<type>sampler-2d</type>
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<value type="int">0</value>
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</uniform>-->
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<uniform>
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<name>colorMode</name>
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<type>int</type>
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<value>
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<use>material/color-mode-uniform</use>
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</value>
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</uniform>
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<uniform>
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<name>WindSpeed</name>
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<type>float</type>
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<value>
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<use>wind-speed</use>
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</value>
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</uniform>
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<uniform>
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<name>Offset</name>
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<type>float</type>
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<value>
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<use>offset</use>
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</value>
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</uniform>
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<uniform>
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<name>AmpFactor</name>
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<type>float</type>
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<value>
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<use>amplitude-factor</use>
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</value>
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</uniform>
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<uniform>
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<name>Noise</name>
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<type>sampler-3d</type>
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<value type="int">9</value>
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</uniform>
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</pass>
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</technique>
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</PropertyList>
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79
Shaders/flutter.vert
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79
Shaders/flutter.vert
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@ -0,0 +1,79 @@
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// -*-C++-*-
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// Shader that uses OpenGL state values to do per-pixel lighting
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//
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// The only light used is gl_LightSource[0], which is assumed to be
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// directional.
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//
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// Diffuse colors come from the gl_Color, ambient from the material. This is
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// equivalent to osg::Material::DIFFUSE.
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#define MODE_OFF 0
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#define MODE_DIFFUSE 1
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#define MODE_AMBIENT_AND_DIFFUSE 2
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// The ambient term of the lighting equation that doesn't depend on
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// the surface normal is passed in gl_{Front,Back}Color. The alpha
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// component is set to 1 for front, 0 for back in order to work around
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// bugs with gl_FrontFacing in the fragment shader.
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varying vec4 diffuse_term;
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varying vec3 normal;
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varying float fogCoord;
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uniform int colorMode;
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uniform float osg_SimulationTime;
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uniform float WindSpeed, Offset, AmpFactor;
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uniform sampler3D Noise;
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void main()
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{
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// map noise vector
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vec4 noisevec = texture3D(Noise, gl_Vertex.xyz);
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//waving effect
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float tsec = osg_SimulationTime;
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vec4 pos = gl_Vertex;
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vec4 oldpos = gl_Vertex;
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float freq = (10 * WindSpeed) + 10;
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pos.y = sin((pos.x * 5.0 + tsec * freq )/5.0) * 0.5 ;
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pos.y += sin((pos.z * 5.0 + tsec * freq/2)/5.0) * 0.125 ;
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pos.y *= pow(pos.x - Offset, 2.0) * AmpFactor;
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gl_Position = gl_ModelViewProjectionMatrix * pos;
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vec4 ecPosition = gl_ModelViewMatrix * gl_Vertex;
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gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
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normal = gl_NormalMatrix * gl_Normal;
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vec4 ambient_color, diffuse_color;
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if (colorMode == MODE_DIFFUSE) {
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diffuse_color = gl_Color;
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ambient_color = gl_FrontMaterial.ambient;
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} else if (colorMode == MODE_AMBIENT_AND_DIFFUSE) {
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diffuse_color = gl_Color;
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ambient_color = gl_Color;
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} else {
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diffuse_color = gl_FrontMaterial.diffuse;
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ambient_color = gl_FrontMaterial.ambient;
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}
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diffuse_term = diffuse_color * gl_LightSource[0].diffuse;
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vec4 ambient_term = ambient_color * gl_LightSource[0].ambient;
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// Super hack: if diffuse material alpha is less than 1, assume a
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// transparency animation is at work
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if (gl_FrontMaterial.diffuse.a < 1.0)
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diffuse_term.a = gl_FrontMaterial.diffuse.a;
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else
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diffuse_term.a = gl_Color.a;
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// Another hack for supporting two-sided lighting without using
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// gl_FrontFacing in the fragment shader.
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gl_FrontColor.rgb = ambient_term.rgb; gl_FrontColor.a = 0.0;
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gl_BackColor.rgb = ambient_term.rgb; gl_FrontColor.a = 1.0;
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fogCoord = abs(ecPosition.z / ecPosition.w);
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}
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