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Howto:Shader programming in FlightGear: Difference between revisions
Howto:Shader programming in FlightGear (view source)
Revision as of 22:32, 12 October 2014
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[[File:als secondary light.png|640px|thumbnail|Proof of Concept]] | [[File:als secondary light.png|640px|thumbnail|Proof of Concept]] | ||
The ALS Landing Lights\Spotlight (we'll call it ALS Lights from now on) 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 (we'll call it ALS Lights from now on) 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. | ||
You have ALS Lights effect you have to | |||
In the case of ALS Lights, you have to add the effect to every visual item rendered on the screen that you want to see a light shining on. If you want it to be capable of shining on everything, you have to account for each separate item and how that item is rendered. That is a lot of code to touch. | |||
The list might include | |||
*runway | |||
*terrain | |||
*models | |||
**ai | |||
**aircraft | |||
**tree | |||
*weather | |||
**fog | |||
**clouds | |||
**hazes | |||
*water | |||
The example highlighted in this articular is was was added to model-defaut.eff | |||
=== Program Flow Simplified === | === Program Flow Simplified === | ||
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Some of this data may play a duel role inside the shader program. In other words it might be used to control other functions in addition to ALS Lights. | Some of this data may play a duel role inside the shader program. In other words it might be used to control other functions in addition to ALS Lights. | ||
There will also be other parameter entries that have nothing to do with ALS Lights. They might be used for other actions or effects the shader is handling. | |||
==== Shader Program ==== | ==== Shader Program ==== | ||
Next comes the entry to define what Shader Program the parameters data is going to be passed to. | |||
<program> | |||
<fragment-shader>Shaders/model-ALS-base.frag</fragment-shader> | |||
<fragment-shader>Shaders/secondary_lights.frag</fragment-shader> | |||
</program> | |||
==== Uniforms ==== | ==== Uniforms ==== | ||