void featureStage(inout Feature feature)
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{
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#ifdef FEATURE_ID_TEXTURE
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float featureId = floor(texture2D(FEATURE_ID_TEXTURE, FEATURE_ID_TEXCOORD).FEATURE_ID_CHANNEL * 255.0 + 0.5);
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vec2 featureSt;
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if (featureId < model_featuresLength)
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{
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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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#else
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// For feature ID vertex attributes, the function generated in FeatureIdPipelineStage
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// is used to update the Feature struct from the varyings passed in.
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updateFeatureStruct(feature);
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#endif
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}
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