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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. | ||
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. | 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 | The list might include | ||
*runway | *runway | ||
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*water | *water | ||
The example highlighted in this | The example highlighted in this article is what was added to tree.eff to shine the lights on trees. | ||
=== Program Flow Simplified === | === Program Flow Simplified === | ||
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Next comes the entry to define what Shader Program the parameters data is going to be passed to. | Next comes the entry to define what Shader Program the parameters data is going to be passed to. | ||
<program> | <program> | ||
<fragment-shader>Shaders/ | <fragment-shader>Shaders/tree-ALS.frag</fragment-shader> | ||
<fragment-shader>Shaders/secondary_lights.frag</fragment-shader> | <fragment-shader>Shaders/secondary_lights.frag</fragment-shader> | ||
</program> | </program> |
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