Fix fringes of text rendering

peterspackman · Aug 29, 2024 · 765a1e9 · 765a1e9
1 parent b8771ae
commit 765a1e9
Show file tree

Hide file tree

Showing 3 changed files with 11 additions and 0 deletions.
diff --git a/shaders/billboard.frag b/shaders/billboard.frag
@@ -12,6 +12,8 @@ uniform float u_textSDFOutline;
 
 void main()
 {
+    vec2 clampedTexCoord = clamp(v_texcoord, 0.0, 1.0);
+
     float distance = texture(u_texture, v_texcoord).r;
     distance -= u_textSDFBuffer;
     float smoothing = u_textSDFSmoothing * fwidth(distance);
@@ -21,10 +23,17 @@ void main()
                                     distance);
     vec3 color = mix(u_textOutlineColor, u_textColor, textAlpha);
     float alpha = max(textAlpha, outlineAlpha);
+
+    // Additional alpha fade near texture edges
+    vec2 edgeDistance = min(clampedTexCoord, 1.0 - clampedTexCoord);
+    float edgeFade = smoothstep(0.0, 0.02, min(edgeDistance.x, edgeDistance.y));
+    alpha *= edgeFade;
+
     fragColor = vec4(color, alpha);
 
     // Discard nearly transparent fragments
     if (alpha < 0.01) {
         discard;
     }
+
 }
diff --git a/src/graphics/scene.cpp b/src/graphics/scene.cpp
@@ -44,6 +44,7 @@ void Scene::init() {
 
   screenGammaChanged();
   materialChanged();
+  textSettingsChanged();
   lightSettingsChanged();
 
   if (m_structure) {

diff --git a/src/graphics/signed_distance_field.h b/src/graphics/signed_distance_field.h
@@ -31,6 +31,7 @@ QImage eigenMatrixToQImage(const Eigen::MatrixXf& matrix) {
     int height = matrix.rows();
     int width = matrix.cols();
     QImage result(width, height, QImage::Format_Grayscale8);
+    result.fill(Qt::white);
 
     float minVal = matrix.minCoeff();
     float maxVal = matrix.maxCoeff();