1 files changed, 47 insertions, 0 deletions
diff --git a/src/quick/scenegraph/shaders/smoothcolor_core.vert b/src/quick/scenegraph/shaders/smoothcolor_core.vert
new file mode 100644
index 0000000000..1eed751ccd
--- /dev/null
+++ b/src/quick/scenegraph/shaders/smoothcolor_core.vert
@@ -0,0 +1,47 @@
+#version 150 core
+
+in vec4 vertex;
+in vec4 vertexColor;
+in vec2 vertexOffset;
+
+out vec4 color;
+
+uniform vec2 pixelSize;
+uniform mat4 matrix;
+uniform float opacity;
+
+void main()
+{
+    vec4 pos = matrix * vertex;
+    gl_Position = pos;
+
+    if (vertexOffset.x != 0.) {
+        vec4 delta = matrix[0] * vertexOffset.x;
+        vec2 dir = delta.xy * pos.w - pos.xy * delta.w;
+        vec2 ndir = .5 * pixelSize * normalize(dir / pixelSize);
+        dir -= ndir * delta.w * pos.w;
+        float numerator = dot(dir, ndir * pos.w * pos.w);
+        float scale = 0.0;
+        if (numerator < 0.0)
+            scale = 1.0;
+        else
+            scale = min(1.0, numerator / dot(dir, dir));
+        gl_Position += scale * delta;
+    }
+
+    if (vertexOffset.y != 0.) {
+        vec4 delta = matrix[1] * vertexOffset.y;
+        vec2 dir = delta.xy * pos.w - pos.xy * delta.w;
+        vec2 ndir = .5 * pixelSize * normalize(dir / pixelSize);
+        dir -= ndir * delta.w * pos.w;
+        float numerator = dot(dir, ndir * pos.w * pos.w);
+        float scale = 0.0;
+        if (numerator < 0.0)
+            scale = 1.0;
+        else
+            scale = min(1.0, numerator / dot(dir, dir));
+        gl_Position += scale * delta;
+    }
+
+    color = vertexColor * opacity;
+}
+\ No newline at end of file