1 files changed, 28 insertions, 0 deletions
diff --git a/res/effectlib/distancefieldtext_dropshadow_core.frag b/res/effectlib/distancefieldtext_dropshadow_core.frag
new file mode 100644
index 0000000..e13182e
--- /dev/null
+++ b/res/effectlib/distancefieldtext_dropshadow_core.frag
@@ -0,0 +1,28 @@
+in vec2 sampleCoord;
+in vec2 shadowSampleCoord;
+in vec4 normalizedTextureBounds;
+
+uniform sampler2D _qt_texture;
+uniform vec4 color;
+uniform vec4 shadowColor;
+
+void main()
+{
+    float shadowDistance = texture(_qt_texture,
+                                   clamp(shadowSampleCoord,
+                                         normalizedTextureBounds.xy,
+                                         normalizedTextureBounds.zw)).r;
+    float shadowDistanceD = fwidth(shadowDistance);
+    float shadowAlpha = smoothstep(0.5 - shadowDistanceD, 0.5, shadowDistance);
+    vec4 shadowPixel = color * shadowColor * shadowAlpha;
+
+    float textDistance = texture(_qt_texture,
+                                 clamp(sampleCoord,
+                                       normalizedTextureBounds.xy,
+                                       normalizedTextureBounds.zw)).r;
+    float textDistanceD = fwidth(textDistance);
+    float textAlpha = smoothstep(0.5 - textDistanceD, 0.5, textDistance);
+    vec4 textPixel = color * textAlpha;
+
+    fragOutput = mix(shadowPixel, textPixel, textPixel.a);
+}