// This stage is only applied for Feature ID vertex attributes.
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// If Feature ID textures are present, those are used in the fragment shader.
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void featureStage(inout Feature feature)
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{
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float featureId = FEATURE_ID_ATTRIBUTE;
|
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if (featureId < model_featuresLength)
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{
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vec2 featureSt = computeSt(featureId);
|
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feature.id = int(featureId);
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feature.st = featureSt;
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feature.color = texture2D(model_batchTexture, featureSt);
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}
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// Floating point comparisons can be unreliable in GLSL, so we
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// increment the feature ID to make sure it's always greater
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// then the model_featuresLength - a condition we check for in the
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// pick ID, to avoid sampling the pick texture if the feature ID is
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// greater than the number of features.
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else
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{
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feature.id = int(model_featuresLength) + 1;
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feature.st = vec2(0.0);
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feature.color = vec4(1.0);
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}
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}
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