1 files changed, 25 insertions, 0 deletions
diff --git a/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass1-curve-weight.glsl b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass1-curve-weight.glsl
new file mode 100644
index 000000000..a489949b4
--- /dev/null
+++ b/src/jogl/classes/jogamp/graph/curve/opengl/shader/curverenderer01-pass1-curve-weight.glsl
@@ -0,0 +1,25 @@
+
+    if( gcv_TexCoord.x == 0.0 && gcv_TexCoord.y == 0.0 ) {
+        // pass-1: Lines
+        color = gcu_ColorStatic.rgb;
+        alpha = 1.0;
+    } else {
+        // pass-1: curves
+        const vec2 rtex = vec2( abs(gcv_TexCoord.x), abs(gcv_TexCoord.y) - 0.1 );
+
+        const vec2 dtx = dFdx(rtex);
+        const vec2 dty = dFdy(rtex);
+          
+        const float w = gcu_Weight;
+        const float pd = ((2.0 - (2.0*w))*rtex.x*rtex.x) + 2.0*(w-1.0)*rtex.x + 1.0;
+        const float position = rtex.y - ((w*rtex.x*(1.0 - rtex.x))/pd);
+
+        const float aph = 2.0 - 2.0*w;
+        
+        const float gd = (aph*rtex.x*rtex.x + 2.0*rtex.x + 1.0)*(aph*rtex.x*rtex.x + 2.0*rtex.x + 1.0);
+        const vec2 f = vec2((dtx.y - (w*dtx.x*(1.0 - 2.0*rtex.x))/gd), (dty.y - (w*dty.x*(1.0 - 2.0*rtex.x))/gd));
+
+        color = gcu_ColorStatic.rgb;
+        alpha = clamp(0.5 - ( position/length(f) ) * sign(gcv_TexCoord.y), 0.0, 1.0);
+    }
+