atlas resolution independent scale

src/MsdfAtlasLayerCombo.cpp

@@ -14,6 +14,7 @@ void MsdfAtlasLayerCombo::setup(const ComboIdentifier & layerIdentifier,
     atlasSettings.minimumScale = this->settings.minimumScale;
     atlasSettings.characters = "";
     atlasSettings.maxInterpolationStepSize = this->settings.maxInterpolationStepSize;
+    scaleFactor = 64.0 / this->settings.scale;
 
     atlas = make_shared <ofxMsdfgen::Atlas>();
 
@@ -43,6 +44,7 @@ void MsdfAtlasLayerCombo::careForChild(shared_ptr <Layer> layer){
     msdfLayer->setDirtyDirty(true);
     msdfLayer->setAtlas(this->atlas);
     msdfLayer->setShader(msdfShader);
+    msdfLayer->scaleFactor = scaleFactor;
     auto & as = atlas->settings;
     for(const char c : layer->getProps().text){
         if(as.characters.find(c) == std::string::npos){

src/MsdfAtlasLayerCombo.h

@@ -33,5 +33,6 @@ class MsdfAtlasLayerCombo : public AtlasLayerCombo {
         VFlipState vFlip;
         ComboIdentifier identifier;
         bool isDirty = false;
+        float scaleFactor = 1.0;
 };
 }

src/MsdfLayer.cpp

@@ -168,6 +168,7 @@ void MsdfLayer::drawCharacter(const char character,
     const ofImage & atlasImage = atlas->getAtlasImage();
     ofDisableAlphaBlending();
     ofEnableDepthTest();
+    scale *= scaleFactor;
     float pixelRange = 2;
     int atlas_w = atlasImage.getWidth();
     int atlas_h = atlasImage.getHeight();

src/MsdfLayer.h

@@ -52,6 +52,7 @@ class MsdfLayer : public Layer {
         /// \brief hashed id, or just counting up
         string id = "";
         VFlipState vFlip = V_FLIP_UNKNOWN;
+        float scaleFactor = 1.0;
 
     private:
         Props lastProps;