pattern tweaks

src/canvas.h

@@ -185,7 +185,7 @@ public:
     static glm::vec3 m_plane_normal[6];
     static glm::vec3 m_plane_tangent[6];
     static glm::mat4 m_plane_transform[6];
-    glm::vec2 stencil_offset;
+    glm::vec2 m_pattern_offset;
     Sampler m_sampler;
     Sampler m_sampler_nearest;
     Sampler m_sampler_linear;