diff --git a/engine/canvas.cpp b/engine/canvas.cpp
index 2124a7e..98e4e1a 100644
--- a/engine/canvas.cpp
+++ b/engine/canvas.cpp
@@ -705,9 +705,9 @@ bool ui::Canvas::create(int width, int height)
         m_tex[i].create(width, height);
         m_tex2[i].create(width, height); // TODO: destroy before recreating
     }
-    m_sampler.create();
-    m_sampler_bg.create();
-    m_sampler_mask.create();
+    m_sampler.create(GL_NEAREST);
+    m_sampler_bg.create(GL_NEAREST);
+    m_sampler_mask.create(GL_NEAREST);
     m_plane.create<1>(1, 1);
     m_plane_brush.create<1>(1, 1);
     m_mesh.create();
@@ -781,36 +781,27 @@ void ui::Canvas::export_equirectangular(std::string data_path)
         GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, // top
         GL_TEXTURE_CUBE_MAP_POSITIVE_Y, // bottom
     };
+    
+    ShaderManager::use(ui::kShader::TextureAlpha);
+    ShaderManager::u_int(kShaderUniform::Highlight, false);
+    ShaderManager::u_int(kShaderUniform::Tex, 0);
+    ShaderManager::u_mat4(kShaderUniform::MVP, glm::ortho(-.5f, .5f, -.5f, .5f, -1.f, 1.f));
+    
     for (int i = 0; i < 6; i++)
     {
         m_tmp[i].bindFramebuffer();
         m_tmp[i].clear({ 1, 1, 1, 1 });
 
+        glActiveTexture(GL_TEXTURE0); // TODO: maybe remove this line
+        m_sampler.bind(0);
         for (auto layer_index : m_order)
         {
-            // copy to tmp2 for layer blending
-            glActiveTexture(GL_TEXTURE0); // TODO: maybe remove this line
-//             m_tex2[i].bind();
-//             glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, m_width, m_height);
-//             m_tex2[i].unbind();
-
-            m_layers[layer_index].m_rtt[i].bindTexture();
-            glActiveTexture(GL_TEXTURE1);
-            m_tex2[i].bind();
-            m_sampler.bind(0);
-            m_sampler_bg.bind(1);
-            ShaderManager::use(ui::kShader::TextureAlpha);
-            //ShaderManager::u_int(kShaderUniform::TexBG, 1);
             ShaderManager::u_float(kShaderUniform::Alpha, m_layers[layer_index].m_opacity);
-            ShaderManager::u_int(kShaderUniform::Highlight, false);
-            ShaderManager::u_int(kShaderUniform::Tex, 0);
-            ShaderManager::u_mat4(kShaderUniform::MVP, glm::ortho(-.5f, .5f, -.5f, .5f, -1.f, 1.f));
+            m_layers[layer_index].m_rtt[i].bindTexture();
             m_plane.draw_fill();
-            m_sampler.unbind();
-            m_sampler_bg.unbind();
-            m_tex2[i].unbind();
             m_layers[layer_index].m_rtt[i].unbindTexture();
         }
+        m_sampler.unbind();
 
         // copy result to cubemap
         glBindTexture(GL_TEXTURE_CUBE_MAP, cube_id);