1 files changed, 41 insertions, 0 deletions
diff --git a/resources/shaders/anchorPoint.geom b/resources/shaders/anchorPoint.geom
new file mode 100644
index 0000000..ccb6b84
--- /dev/null
+++ b/resources/shaders/anchorPoint.geom
@@ -0,0 +1,41 @@
+#version 330 core
+
+layout(points) in;
+layout (triangle_strip, max_vertices = 4) out;
+
+in vec4 vColor[];
+out vec4  fColor;
+out vec2  fPoint;
+out float fRadius;
+
+uniform int width;
+uniform int height;
+uniform float vSize;
+
+void main() {
+    vec4 offset = vec4(vSize, -vSize, 0.0, 0.0);
+
+    int i;
+    for (i = 0; i < gl_in.length(); i ++) {
+        vec4 p = gl_in[i].gl_Position;
+
+        fColor = vColor[i];
+        fPoint = vec2((p.x * 0.5 + 0.5) * width,
+                      (p.y * 0.5 + 0.5) * height);
+        fRadius = vSize;
+
+        gl_Position = p + offset.yxzw;
+        EmitVertex();
+
+        gl_Position = p + offset.yyzw;
+        EmitVertex();
+
+        gl_Position = p + offset.xxzw;
+        EmitVertex();
+
+        gl_Position = p + offset.xyzw;
+        EmitVertex();
+
+        EndPrimitive();
+    }
+}