1 files changed, 51 insertions, 0 deletions
diff --git a/src/quick/scenegraph/shaders_ng/smoothcolor.vert b/src/quick/scenegraph/shaders_ng/smoothcolor.vert
new file mode 100644
index 0000000000..03a3ff8975
--- /dev/null
+++ b/src/quick/scenegraph/shaders_ng/smoothcolor.vert
@@ -0,0 +1,51 @@
+#version 440
+
+layout(location = 0) in vec4 vertex;
+layout(location = 1) in vec4 vertexColor;
+layout(location = 2) in vec4 vertexOffset;
+
+layout(location = 0) out vec4 color;
+
+layout(std140, binding = 0) uniform buf {
+    mat4 matrix;
+    vec2 pixelSize;
+    float opacity;
+} ubuf;
+
+out gl_PerVertex { vec4 gl_Position; };
+
+void main()
+{
+    vec4 pos = ubuf.matrix * vertex;
+    gl_Position = pos;
+
+    if (vertexOffset.x != 0.) {
+        vec4 delta = ubuf.matrix[0] * vertexOffset.x;
+        vec2 dir = delta.xy * pos.w - pos.xy * delta.w;
+        vec2 ndir = .5 * ubuf.pixelSize * normalize(dir / ubuf.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 = ubuf.matrix[1] * vertexOffset.y;
+        vec2 dir = delta.xy * pos.w - pos.xy * delta.w;
+        vec2 ndir = .5 * ubuf.pixelSize * normalize(dir / ubuf.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 * ubuf.opacity;
+}