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Howto:Shader programming in FlightGear: Difference between revisions
Howto:Shader programming in FlightGear (view source)
Revision as of 21:22, 12 October 2014
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The ALS Landing Lights/Spotlight is a good example for showing how to incorporate a shader effect into [[Flightgear]] as it touches many parts of the visuals we see and many parts of the coding pipeline. | The ALS Landing Lights/Spotlight is a good example for showing how to incorporate a shader effect into [[Flightgear]] as it touches many parts of the visuals we see and many parts of the coding pipeline. | ||
===Program Flow Simplified=== | |||
Preferences/Nasal/XML >> Property Tree >> Effect File >> Shader >> Rendered to Screen | |||
{{Note| | ===Preferences/Nasal/XML=== | ||
Any combination of Preferences, Nasal or XML manipulates data in the property tree. | |||
In this case the switch to turn on the landing or spot light and a couple other needed data containers are defined in $FG_ROOT/preferences.xml with the following lines. | |||
<als-secondary-lights> | |||
<use-searchlight type="bool">false</use-searchlight> | |||
<use-landing-light type="bool">false</use-landing-light> | |||
<use-alt-landing-light type="bool">false</use-alt-landing-light> | |||
<landing-light1-offset-deg type="float">0.0</landing-light1-offset-deg> | |||
<landing-light2-offset-deg type="float">0.0</landing-light2-offset-deg> | |||
</als-secondary-lights> | |||
===Effects File=== | |||
{{Note|need link to Effects Doc here}} | |||
*Parameters | |||
Parameters | |||
*Shader Program | |||
*Uniforms | |||
===Shader Program=== | |||
*Uniform Input | |||
*Variable Assignments | |||
*Main Program | |||
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*** fragment water-ALS-high.frag & secondary_lights.frag | *** fragment water-ALS-high.frag & secondary_lights.frag | ||
** adds uniforms (technique 2) | ** adds uniforms (technique 2) | ||