blendish: new function for node backgrounds

blendish.h

@@ -383,6 +383,9 @@ void bndNodePort(NVGcontext *ctx, float x, float y, BNDwidgetState state,
 void bndNodeWire(NVGcontext *ctx, float x0, float y0, float x1, float y1, 
     BNDwidgetState state0, BNDwidgetState state1);
 
+// Draw a node background with its upper left origin at (x,y) and size of (w,h)
+void bndNodeBackground(NVGcontext *ctx, float x, float y, float w, float h);
+
 ////////////////////////////////////////////////////////////////////////////////
         
 // Estimator Functions
@@ -619,6 +622,8 @@ NVGcolor bndNodeWireColor(const BNDnodeTheme *theme, BNDwidgetState state);
 #define BND_NODE_WIRE_OUTLINE_WIDTH 4
 // stroke width of wire
 #define BND_NODE_WIRE_WIDTH 2
+// radius of node box
+#define BND_NODE_RADIUS 10
 
 ////////////////////////////////////////////////////////////////////////////////
 
@@ -1088,6 +1093,18 @@ void bndNodeWire(NVGcontext *ctx, float x0, float y0, float x1, float y1,
     nvgStroke(ctx);
 }
 
+void bndNodeBackground(NVGcontext *ctx, float x, float y, float w, float h) {
+    bndInnerBox(ctx,x,y,w,h+1,
+        BND_NODE_RADIUS,BND_NODE_RADIUS,BND_NODE_RADIUS,BND_NODE_RADIUS,
+        bnd_theme.nodeTheme.nodeBackdropColor, 
+        bnd_theme.nodeTheme.nodeBackdropColor);
+    bndOutlineBox(ctx,x,y,w,h+1,
+        BND_NODE_RADIUS,BND_NODE_RADIUS,BND_NODE_RADIUS,BND_NODE_RADIUS,
+        bndTransparent(nvgRGBf(0,0,0)));
+    bndDropShadow(ctx,x,y,w,h,BND_NODE_RADIUS,
+        BND_SHADOW_FEATHER,BND_SHADOW_ALPHA);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 
 float bndLabelWidth(NVGcontext *ctx, int iconid, const char *label) {

example.cpp

@@ -461,6 +461,8 @@ int row(int parent) {
 void draw_noodles(NVGcontext *vg, int x, int y) {
     int w = 200;
     int s = 70;
+
+    bndNodeBackground(vg, x+w, y-50, 150, 200);
     
     for (int i = 0; i < 9; ++i) {
         int a = i%3;