implement label drawable

openVulkanoCpp/Shader/label.frag

@@ -0,0 +1,44 @@
+#version 450
+
+layout(location = 0) in vec4 color;
+layout(location = 1) in vec2 texCoord;
+layout(location = 0) out vec4 outColor;
+
+layout(set = 5, binding = 0) uniform LabelData
+{
+   vec2 textSize;
+   float radius;
+   float arrowLength;
+   bool hasRoundedCorners;
+   bool hasArrow;
+} labelInfo;
+
+void main()
+{   
+    if (labelInfo.hasRoundedCorners)
+    {
+        vec2 bbox;
+        if (!labelInfo.hasArrow)
+        {
+            bbox = labelInfo.textSize;
+        }
+        else
+        {
+            bbox = vec2(labelInfo.textSize.x, labelInfo.textSize.y + labelInfo.arrowLength);
+        }
+
+        const float arrowLength = labelInfo.hasArrow ? labelInfo.arrowLength : 0;
+        vec2 uvScaled = texCoord * bbox;
+        //vec2 uvNoArrow = texCoord * labelInfo.textSize;
+        float distX = min(uvScaled.x, bbox.x - uvScaled.x);
+        float distY = min(uvScaled.y - arrowLength, bbox.y - uvScaled.y);
+        
+        float distanceFromEdge = distX * distY;
+        float scaledRadius = labelInfo.radius/10000.f;
+        if (distanceFromEdge < scaledRadius)
+        {
+            discard;
+        }
+    }
+    outColor = color;
+}