diff --git a/PanoPainter-OSX/main.cpp b/PanoPainter-OSX/main.cpp
index f2bd452..04387bd 100644
--- a/PanoPainter-OSX/main.cpp
+++ b/PanoPainter-OSX/main.cpp
@@ -14,11 +14,15 @@
 @interface View : NSOpenGLView
 {
     CVDisplayLinkRef dl;
+    NSOpenGLContext* glctx;
+    _CGLContextObject* cgl;
+    bool gl_ready;
 }
 - (void)terminateGL;
 @end @implementation View
 - (instancetype)initWithFrame:(NSRect)frameRect
 {
+    gl_ready = false;
     NSOpenGLPixelFormatAttribute attrs[] =
     {
         NSOpenGLPFADoubleBuffer,
@@ -57,14 +61,18 @@
     CGLPixelFormatObj cglPixelFormat = [[self pixelFormat] CGLPixelFormatObj];
     CVDisplayLinkSetCurrentCGDisplayFromOpenGLContext(dl, cglContext, cglPixelFormat);
     
+    CGLEnable([self.openGLContext CGLContextObj], kCGLCECrashOnRemovedFunctions);
+
     // Activate the display link
     CVDisplayLinkStart(dl);
-    
-    CGLEnable([self.openGLContext CGLContextObj], kCGLCECrashOnRemovedFunctions);
+
+    cgl = [[self openGLContext] CGLContextObj];
+    glctx = [self openGLContext];
     
     CGLLockContext([[self openGLContext] CGLContextObj]);
     App::I.init();
     CGLUnlockContext([[self openGLContext] CGLContextObj]);
+    gl_ready = true;
 }
 
 - (void)terminateGL
@@ -90,24 +98,23 @@ static CVReturn MyDisplayLinkCallback(CVDisplayLinkRef displayLink, const CVTime
     double now = hostTime / _timeFreq;
     
     // this will not update unless 1/30th of a second has passed since the last update
-    if ( now < _prevTime + (1.0 / 30.0) )
+    if ( now < _prevTime + (1.0 / 30.0) && App::I.redraw )
     {
-        // Add your drawing codes here
-        [[self openGLContext] makeCurrentContext];
-        
         // We draw on a secondary thread through the display link
         // When resizing the view, -reshape is called automatically on the main
         // thread. Add a mutex around to avoid the threads accessing the context
         // simultaneously when resizing
-        CGLLockContext([[self openGLContext] CGLContextObj]);
+        [glctx makeCurrentContext];
+        CGLLockContext([glctx CGLContextObj]);
+        
         App::I.clear();
         App::I.update(now - _prevTime);
         
         //[[self openGLContext] flushBuffer];
         // returning NO will cause the layer to NOT be redrawn
         
-        CGLFlushDrawable([[self openGLContext] CGLContextObj]);
-        CGLUnlockContext([[self openGLContext] CGLContextObj]);
+        CGLFlushDrawable([glctx CGLContextObj]);
+        CGLUnlockContext([glctx CGLContextObj]);
         return NO;
     }
     else
@@ -130,21 +137,21 @@ static CVReturn MyDisplayLinkCallback(CVDisplayLinkRef displayLink, const CVTime
 - (void)drawRect:(NSRect)dirtyRect
 {
     NSLog(@"drawRect");
-    // Add your drawing codes here
-    [[self openGLContext] makeCurrentContext];
     
     // We draw on a secondary thread through the display link
     // When resizing the view, -reshape is called automatically on the main
     // thread. Add a mutex around to avoid the threads accessing the context
     // simultaneously when resizing
-    CGLLockContext([[self openGLContext] CGLContextObj]);
+    [glctx makeCurrentContext];
+    CGLLockContext(cgl);
+
     App::I.update(0);
     
     //[[self openGLContext] flushBuffer];
     // returning NO will cause the layer to NOT be redrawn
     
-    CGLFlushDrawable([[self openGLContext] CGLContextObj]);
-    CGLUnlockContext([[self openGLContext] CGLContextObj]);
+    CGLFlushDrawable(cgl);
+    CGLUnlockContext(cgl);
 }
 
 - (void)reshape
diff --git a/PanoPainter/AppDelegate.m b/PanoPainter/AppDelegate.m
index 63752ef..58061ca 100644
--- a/PanoPainter/AppDelegate.m
+++ b/PanoPainter/AppDelegate.m
@@ -7,6 +7,7 @@
 //
 
 #import "AppDelegate.h"
+#include "app.h"
 
 @interface AppDelegate ()
 
@@ -32,10 +33,12 @@
 
 - (void)applicationWillEnterForeground:(UIApplication *)application {
     // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
+    App::I.redraw = true;
 }
 
 - (void)applicationDidBecomeActive:(UIApplication *)application {
     // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
+    App::I.redraw = true;
 }
 
 - (void)applicationWillTerminate:(UIApplication *)application {
diff --git a/data/layout.xml b/data/layout.xml
index e36854d..649be86 100644
--- a/data/layout.xml
+++ b/data/layout.xml
@@ -165,6 +165,34 @@
     </border>
   </layout>
 
+  <!-- Dialog Relane Layer -->
+  <layout id="dialog-layer-rename">
+    <border positioning="absolute" position="0 0" color=".4 .4 .4 .8" width="100%" height="100%" align="center" justify="center">
+      <border thickness="1" border-color=".2" pad="3">
+        <border width="400" height="30" color=".2 .2 .2 .9" dir="row" align="center" justify="center">
+          <text text="Rename Layer" font-face="arial" font-size="11"></text>
+        </border>
+        <border width="400" color="0 0 0 .9" pad="10" dir="col">
+          <node dir="row">
+            <text text="New name: " font-face="arial" font-size="11"/>
+            <text-input id="txt-input" width="100" height="20" color=".3"/>
+          </node>
+          <node height="40" grow="1" dir="row" align="flex-end" justify="flex-end">
+            <button id="btn-ok" text="Rename Layer" width="100" height="30" margin="0 10 0 0"/>
+            <button id="btn-cancel" text="Cancel" width="60" height="30" pad="10"/>
+          </node>
+        </border>
+      </border>
+    </border>
+  </layout>
+
+  <layout id="dialog-open-item">
+    <node dir="row">
+      <image-texture id="thumb-tex" width="64" height="64"/>
+      <text text="Longer description for the error or the message." font-face="arial" font-size="11"></text>
+    </node>
+  </layout>
+
   <!-- Open Dialog Popup -->
   <layout id="dialog-open">
     <border positioning="absolute" position="0 0" color=".4 .4 .4 .8" width="100%" height="100%" align="center" justify="center">
@@ -173,9 +201,10 @@
           <text text="Open PanoPainter Project" font-face="arial" font-size="11"></text>
         </border>
         <border width="400" color="0 0 0 .9" pad="10" dir="col">
-          <image-texture id="thumb-tex" width="64" height="64"/>
-          <text text="Longer description for the error or the message." font-face="arial" font-size="11"></text>
-          <text-input width="100" height="100" color=".3"/>
+          <ref id="dialog-open-item" />
+          <ref id="dialog-open-item" />
+          <ref id="dialog-open-item" />
+          <!--<text-input width="100" height="100" color=".3"/>-->
           <node height="40" grow="1" dir="row" align="flex-end" justify="flex-end">
             <button id="btn-ok" text="Open Project" width="100" height="30" margin="0 10 0 0"/>
             <button id="btn-cancel" text="Cancel" width="60" height="30" pad="10"/>
@@ -307,11 +336,15 @@
 
   <!--layers menu-->
   <layout id="layers-menu">
-    <popup-menu positioning="absolute" position="100 100" width="150" thickness="1" border-color=".1" color=".4 .4 .4 .8" dir="col">
+    <popup-menu positioning="absolute" position="100 100" width="250" thickness="1" border-color=".1" color=".4 .4 .4 .8" dir="col">
       <button-custom id="clear-grids" height="30" align="center" color=".2" pad="0 0 0 10" dir="row">
         <icon icon="add" width="20"/>
         <text text="Clear grids" margin="0 0 0 5" font-face="arial" font-size="11"/>
       </button-custom>
+      <button-custom id="layer-rename" height="30" align="center" color=".2" pad="0 0 0 10" dir="row">
+        <icon icon="application_edit" width="20"/>
+        <text id="menu-label" text="Rename Layer" margin="0 0 0 5" font-face="arial" font-size="11"/>
+      </button-custom>
     </popup-menu>
   </layout>
 
diff --git a/engine.xcodeproj/project.pbxproj b/engine.xcodeproj/project.pbxproj
index f4382b4..e63d960 100644
--- a/engine.xcodeproj/project.pbxproj
+++ b/engine.xcodeproj/project.pbxproj
@@ -158,6 +158,9 @@
 		AD95AEC71E41EDEC002DD03A /* pch.cpp in Sources */ = {isa = PBXBuildFile; fileRef = AD95AEC51E41EDEC002DD03A /* pch.cpp */; };
 		ADB1C3DA1EA3A156009A65BD /* event.cpp in Sources */ = {isa = PBXBuildFile; fileRef = ADB1C3D81EA3A156009A65BD /* event.cpp */; };
 		ADB61C821E3D38450093280F /* util.cpp in Sources */ = {isa = PBXBuildFile; fileRef = ADB61C801E3D38450093280F /* util.cpp */; };
+		ADC6F4621F3AFF2C004177FA /* node_dialog_layer_rename.cpp in Sources */ = {isa = PBXBuildFile; fileRef = ADC6F4611F3AFA2B004177FA /* node_dialog_layer_rename.cpp */; };
+		ADC6F4631F3AFF2D004177FA /* node_dialog_layer_rename.cpp in Sources */ = {isa = PBXBuildFile; fileRef = ADC6F4611F3AFA2B004177FA /* node_dialog_layer_rename.cpp */; };
+		ADC6F4641F3AFF2E004177FA /* node_dialog_layer_rename.cpp in Sources */ = {isa = PBXBuildFile; fileRef = ADC6F4611F3AFA2B004177FA /* node_dialog_layer_rename.cpp */; };
 		ADD7D26F1EBF9AE300D5A897 /* main.m in Sources */ = {isa = PBXBuildFile; fileRef = ADD7D26E1EBF9AE300D5A897 /* main.m */; };
 		ADD7D2721EBF9AE300D5A897 /* AppDelegate.m in Sources */ = {isa = PBXBuildFile; fileRef = ADD7D2711EBF9AE300D5A897 /* AppDelegate.m */; };
 		ADD7D2791EBF9AE300D5A897 /* GameViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = ADD7D2781EBF9AE300D5A897 /* GameViewController.m */; };
@@ -319,10 +322,12 @@
 		ADB1C3DB1EA531B0009A65BD /* keymap.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = keymap.h; sourceTree = "<group>"; };
 		ADB61C801E3D38450093280F /* util.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = util.cpp; sourceTree = "<group>"; };
 		ADB61C811E3D38450093280F /* util.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = util.h; sourceTree = "<group>"; };
+		ADC6F4601F3AFA2A004177FA /* node_dialog_layer_rename.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = node_dialog_layer_rename.h; sourceTree = "<group>"; };
+		ADC6F4611F3AFA2B004177FA /* node_dialog_layer_rename.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = node_dialog_layer_rename.cpp; sourceTree = "<group>"; };
 		ADD7D26B1EBF9AE300D5A897 /* PanoPainter.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = PanoPainter.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		ADD7D26E1EBF9AE300D5A897 /* main.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = main.m; sourceTree = "<group>"; };
 		ADD7D2701EBF9AE300D5A897 /* AppDelegate.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = AppDelegate.h; sourceTree = "<group>"; };
-		ADD7D2711EBF9AE300D5A897 /* AppDelegate.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = AppDelegate.m; sourceTree = "<group>"; };
+		ADD7D2711EBF9AE300D5A897 /* AppDelegate.m */ = {isa = PBXFileReference; explicitFileType = sourcecode.cpp.objcpp; path = AppDelegate.m; sourceTree = "<group>"; };
 		ADD7D2771EBF9AE300D5A897 /* GameViewController.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GameViewController.h; sourceTree = "<group>"; };
 		ADD7D2781EBF9AE300D5A897 /* GameViewController.m */ = {isa = PBXFileReference; explicitFileType = sourcecode.cpp.objcpp; path = GameViewController.m; sourceTree = "<group>"; };
 		ADD7D27B1EBF9AE300D5A897 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
@@ -421,6 +426,8 @@
 				AD10635C1EC7ADFA002A525F /* node_color_quad.h */,
 				AD10635D1EC7ADFA002A525F /* node_dialog_open.cpp */,
 				AD10635E1EC7ADFA002A525F /* node_dialog_open.h */,
+				ADC6F4611F3AFA2B004177FA /* node_dialog_layer_rename.cpp */,
+				ADC6F4601F3AFA2A004177FA /* node_dialog_layer_rename.h */,
 				AD10635F1EC7ADFA002A525F /* node_icon.cpp */,
 				AD1063601EC7ADFA002A525F /* node_icon.h */,
 				AD1063611EC7ADFA002A525F /* node_image_texture.cpp */,
@@ -754,6 +761,7 @@
 				AD0E5CC61ECC72AD00C35669 /* node_panel_layer.cpp in Sources */,
 				AD0E5CBA1ECC72AD00C35669 /* node_button_custom.cpp in Sources */,
 				AD0E5CC31ECC72AD00C35669 /* node_message_box.cpp in Sources */,
+				ADC6F4631F3AFF2D004177FA /* node_dialog_layer_rename.cpp in Sources */,
 				AD0E5CC41ECC72AD00C35669 /* node_panel_brush.cpp in Sources */,
 				AD0E5CBC1ECC72AD00C35669 /* node_canvas.cpp in Sources */,
 				AD0E5CD01ECC72AD00C35669 /* action.cpp in Sources */,
@@ -813,6 +821,7 @@
 				AD1063851EC7ADFA002A525F /* node_dialog_open.cpp in Sources */,
 				AD58E0681E2A7741006ACC15 /* image.cpp in Sources */,
 				AD0E11A11ECA619F00CDA6BB /* jpgd.cpp in Sources */,
+				ADC6F4641F3AFF2E004177FA /* node_dialog_layer_rename.cpp in Sources */,
 				AD1063901EC7ADFA002A525F /* node_slider.cpp in Sources */,
 				AD0E11981ECA20F200CDA6BB /* app_layout.cpp in Sources */,
 				AD58E0771E3421F2006ACC15 /* Yoga.c in Sources */,
@@ -836,6 +845,7 @@
 				AD0E11A51ECA61B900CDA6BB /* jpgd.cpp in Sources */,
 				ADD7D29E1EBF9E1C00D5A897 /* shape.cpp in Sources */,
 				ADD7D2901EBF9E1C00D5A897 /* canvas_modes.cpp in Sources */,
+				ADC6F4621F3AFF2C004177FA /* node_dialog_layer_rename.cpp in Sources */,
 				AD10639A1EC7AE92002A525F /* node_canvas.cpp in Sources */,
 				ADD7D2A31EBFA06F00D5A897 /* tinyxml2.cpp in Sources */,
 				AD10639B1EC7AE92002A525F /* node_checkbox.cpp in Sources */,
diff --git a/engine/app.h b/engine/app.h
index 62ae67a..788e39e 100644
--- a/engine/app.h
+++ b/engine/app.h
@@ -14,6 +14,7 @@
 #include "node_panel_color.h"
 #include "node_panel_stroke.h"
 #include "node_canvas.h"
+#include "node_dialog_layer_rename.h"
 
 #if defined(__OBJC__) && defined(__IOS__)
 #import <Foundation/Foundation.h>
diff --git a/engine/app_layout.cpp b/engine/app_layout.cpp
index 2e88afd..30ab044 100644
--- a/engine/app_layout.cpp
+++ b/engine/app_layout.cpp
@@ -131,9 +131,9 @@ void App::initLayout()
         {
             button->on_click = [this](Node*) {
                 CanvasModePen* mode = (CanvasModePen*)canvas->m_canvas->modes[(int)Canvas::kCanvasMode::Draw][0];
-                if (mode)
+                if (mode && canvas->m_canvas->m_current_mode == Canvas::kCanvasMode::Draw)
                 {
-                    mode->m_picking = true;
+                    mode->m_picking = !mode->m_picking;
                 }
             };
         }
@@ -376,6 +376,35 @@ void App::initLayout()
                     popup->mouse_release();
                     popup->destroy();
                 };
+                popup->find<NodeButtonCustom>("layer-rename")->on_click = [this](Node*) {
+                    // load thumbnail test
+                    auto open_dialog = std::make_shared<NodeDialogLayerRename>();
+                    open_dialog->m_manager = &layout;
+                    open_dialog->data_path = data_path;
+                    open_dialog->init();
+                    open_dialog->create();
+                    open_dialog->loaded();
+
+                    layout[main_id]->add_child(open_dialog);
+                    layout[main_id]->update();
+                    
+                    open_dialog->btn_ok->on_click = [this,open_dialog](Node*)
+                    {
+                        layers->m_current_layer->set_name(open_dialog->get_name().c_str());
+                        open_dialog->destroy();
+                    };
+
+                    popup->mouse_release();
+                    popup->destroy();
+                };
+                if (layers->m_current_layer)
+                    popup->find<NodeButtonCustom>("layer-rename")->
+                        find<NodeText>("menu-label")->
+                        set_text(("Rename Layer " + layers->m_current_layer->m_label_text).c_str());
+                else
+                    popup->find<NodeButtonCustom>("layer-rename")->
+                        find<NodeText>("menu-label")->
+                        set_text("Rename Layer (Select a layer)");
             };
         }
         if (auto* toolbar = layout[main_id]->find<Node>("toolbar"))
diff --git a/engine/app_shaders.cpp b/engine/app_shaders.cpp
index b3b594f..ed691d1 100644
--- a/engine/app_shaders.cpp
+++ b/engine/app_shaders.cpp
@@ -43,6 +43,49 @@ void App::initShaders()
         "void main(){\n"
         "   frag = texture(tex, uv.xy) * vec4(1,1,1,alpha);\n"
         "}\n";
+    // TEXTURE COMP ERASE
+    static const char* shader_comp_erase_f =
+        SHADER_VERSION
+        "uniform sampler2D tex;\n"
+        "uniform sampler2D tex_stroke;\n"
+        "uniform mediump float alpha;\n"
+        "uniform bool lock;\n"
+        "in mediump vec3 uv;\n"
+        "out mediump vec4 frag;\n"
+        "void main(){\n"
+        "   mediump vec4 base = texture(tex, uv.xy);\n"
+        "   mediump vec4 stroke = texture(tex_stroke, uv.xy);\n"
+        "   mediump float a = base.a - (stroke.a * alpha);\n"
+        "   frag = vec4(base.rgb, clamp(a, 0.0, 1.0));\n"
+        "}\n";
+    // TEXTURE COMP DRAW
+    static const char* shader_comp_draw_f =
+        SHADER_VERSION
+        "uniform sampler2D tex;\n"
+        "uniform sampler2D tex_stroke;\n"
+        "uniform mediump float alpha;\n"
+        "uniform bool lock;\n"
+        "in mediump vec3 uv;\n"
+        "out mediump vec4 frag;\n"
+        "void main(){\n"
+        "   mediump vec4 base = texture(tex, uv.xy);\n"
+        "   mediump vec4 stroke = texture(tex_stroke, uv.xy);\n"
+        "   stroke.a = stroke.a * alpha;\n"
+
+        "   if (lock){\n"
+        "       mediump float alpha_tot = stroke.a + (1.0 - stroke.a) * base.a;"
+        "       mediump vec3 rgb = mix(base.rgb, stroke.rgb, stroke.a / alpha_tot);\n"
+        "       frag = vec4(rgb, base.a);\n"
+        "   } else {\n"
+        "       mediump float alpha_tot = stroke.a + (1.0 - stroke.a) * base.a;"
+        "       mediump vec3 rgb = mix(base.rgb, stroke.rgb, stroke.a / alpha_tot);\n"
+        "       frag = vec4(rgb, alpha_tot);\n"
+        "   }\n"
+
+//        "   mediump float alpha_tot = stroke.a + (1.0 - stroke.a) * base.a;"
+//        "   mediump vec3 rgb = mix(base.rgb, stroke.rgb, stroke.a / alpha_tot);\n"
+//        "   frag = vec4(rgb, alpha_tot);\n"
+        "}\n";
 
     // TEXTURE ATLAS
     static const char* shader_atlas_v =
@@ -164,26 +207,40 @@ void App::initShaders()
         "}\n";
     static const char* shader_stroke_f =
         SHADER_VERSION
+        #ifdef __IOS__
+        "#extension GL_EXT_shader_framebuffer_fetch : enable\n"
+        #endif
         "uniform mediump sampler2D tex;\n"
         "uniform mediump sampler2D tex_bg;\n"
         "uniform mediump vec4 col;\n"
         "uniform mediump vec2 resolution;\n"
         "uniform mediump float alpha;\n"
         "in mediump vec2 uv;\n"
+        #ifdef __IOS__
+        "inout mediump vec4 frag;\n"
+        #else
         "out mediump vec4 frag;\n"
+        #endif
         "void main(){\n"
         "   mediump vec2 uv2 = gl_FragCoord.st / resolution;\n"
         "   mediump float brush_alpha = ( 1.0 - texture(tex, uv).r ) * alpha;\n"
         "   mediump vec4 fg = vec4(col.rgb, brush_alpha);\n"
+        #ifdef __IOS__
+        "   mediump vec4 bg = frag;\n"
+        #else
         "   mediump vec4 bg = texture(tex_bg, uv2);\n"
-        "   if (fg.a < (1.0/255.0)) { frag = bg; return; }\n"
+        #endif
+        //"   if (fg.a < 1.0/255.0) { frag = bg; return; }\n"
         "   mediump float alpha_tot = fg.a + (1.0 - fg.a) * bg.a;"
         "   mediump vec3 rgb = mix(bg.rgb, fg.rgb, fg.a / alpha_tot);\n"
-        "   frag = vec4(rgb, alpha_tot);\n"
+        "   frag = vec4(rgb, clamp(alpha_tot, 0.0, 1.0));\n"
         "}\n";
     // ALPHA LOCK
     static const char* shader_stroke_lock_f =
         SHADER_VERSION
+        #ifdef __IOS__
+        "#extension GL_EXT_shader_framebuffer_fetch : enable\n"
+        #endif
         "uniform mediump sampler2D tex;\n"
         "uniform mediump sampler2D tex_bg;\n"
         "uniform mediump sampler2D tex_mask;\n"
@@ -191,32 +248,51 @@ void App::initShaders()
         "uniform mediump vec2 resolution;\n"
         "uniform mediump float alpha;\n"
         "in mediump vec2 uv;\n"
+        #ifdef __IOS__
+        "inout mediump vec4 frag;\n"
+        #else
         "out mediump vec4 frag;\n"
+        #endif
         "void main(){\n"
         "   mediump vec2 uv2 = gl_FragCoord.st / resolution;\n"
         "   mediump float brush_alpha = ( 1.0 - texture(tex, uv).r ) * alpha;\n"
         "   mediump vec4 fg = vec4(col.rgb, brush_alpha);\n"
+        #ifdef __IOS__
+        "   mediump vec4 bg = frag;\n"
+        #else
         "   mediump vec4 bg = texture(tex_bg, uv2);\n"
+        #endif
         "   mediump vec4 msk = texture(tex_mask, uv2);\n"
-        "   if (fg.a < (1.0/255.0)) { frag = bg; return; }\n"
+        //"   if (fg.a < (1.0/255.0)) { return; }\n"
         "   mediump float alpha_tot = fg.a + (1.0 - fg.a) * bg.a;"
         "   mediump vec3 rgb = mix(bg.rgb, fg.rgb, fg.a / alpha_tot);\n"
-        "   frag = vec4(rgb, min(alpha_tot, msk.a));\n"
+        "   frag = vec4(rgb, msk.a);\n"
         "}\n";
     // ERASER
     static const char* shader_stroke_erase_f =
         SHADER_VERSION
+        #ifdef __IOS__
+        "#extension GL_EXT_shader_framebuffer_fetch : enable\n"
+        #endif
         "uniform mediump sampler2D tex;\n"
         "uniform mediump sampler2D tex_bg;\n"
         "uniform mediump vec4 col;\n"
         "uniform mediump vec2 resolution;\n"
         "uniform mediump float alpha;\n"
         "in mediump vec2 uv;\n"
+        #ifdef __IOS__
+        "inout mediump vec4 frag;\n"
+        #else
         "out mediump vec4 frag;\n"
+        #endif
         "void main(){\n"
         "   mediump vec2 uv2 = gl_FragCoord.st / resolution;\n"
         "   mediump float brush_alpha = ( 1.0 - texture(tex, uv).r ) * alpha;\n"
+        #ifdef __IOS__
+        "   mediump vec4 bg = frag;\n"
+        #else
         "   mediump vec4 bg = texture(tex_bg, uv2);\n"
+        #endif
         "   frag = vec4(bg.rgb, bg.a - bg.a * brush_alpha);\n"
         "}\n";
 
@@ -233,19 +309,36 @@ void App::initShaders()
         "}";
     static const char* shader_stroke_layer_f =
         SHADER_VERSION
+        #ifdef __IOS__
+        "#extension GL_EXT_shader_framebuffer_fetch : enable\n"
+        #endif
         "uniform mediump sampler2D tex;\n"
         "uniform mediump sampler2D tex_bg;\n"
         "uniform mediump vec2 resolution;\n"
         "uniform mediump float alpha;\n"
+        "uniform bool lock;\n"
+        "uniform bool erase;\n"
         "in mediump vec2 uv;\n"
+        #ifdef __IOS__
+        "inout mediump vec4 frag;\n"
+        #else
         "out mediump vec4 frag;\n"
+        #endif
         "void main(){\n"
         "   mediump vec4 fg = texture(tex, uv) * vec4(1,1,1,alpha);\n"
+        #ifdef __IOS__
+        "   mediump vec4 bg = frag;\n"
+        #else
         "   mediump vec4 bg = texture(tex_bg, uv);\n"
-        "   if (fg.a < (1.0/255.0)) { frag = bg; return; }\n"
-        "   mediump float alpha_tot = fg.a + (1.0 - fg.a) * bg.a;"
-        "   mediump vec3 rgb = mix(bg.rgb, fg.rgb, fg.a / alpha_tot);\n"
-        "   frag = vec4(rgb, alpha_tot);\n"
+        #endif
+        //"   if (fg.a < (1.0/255.0)) { frag = bg; return; }\n"
+        "   if (erase){\n"
+        "       frag = vec4(bg.rgb, bg.a - fg.a);\n"
+        "   } else {\n"
+        "       mediump float alpha_tot = fg.a + (1.0 - fg.a) * bg.a;"
+        "       mediump vec3 rgb = mix(bg.rgb, fg.rgb, fg.a / alpha_tot);\n"
+        "       frag = vec4(rgb, lock ? bg.a : alpha_tot);\n"
+        "   }\n"
         "}\n";
 
     static const char* shader_checkerboard_v =
@@ -304,6 +397,10 @@ void App::initShaders()
         LOG("Failed to create shader Texture");
     if (!ShaderManager::create(kShader::TextureAlpha, shader_v, shader_alpha_f))
         LOG("Failed to create shader TextureAlpha");
+    if (!ShaderManager::create(kShader::CompErase, shader_v, shader_comp_erase_f))
+        LOG("Failed to create shader CompErase");
+    if (!ShaderManager::create(kShader::CompDraw, shader_v, shader_comp_draw_f))
+        LOG("Failed to create shader CompDraw");
     if (!ShaderManager::create(kShader::Color, shader_color_v, shader_color_f))
         LOG("Failed to create shader Color");
     if (!ShaderManager::create(kShader::ColorQuad, shader_color_quad_v, shader_color_quad_f))
diff --git a/engine/canvas.cpp b/engine/canvas.cpp
index ff367c8..e21751e 100644
--- a/engine/canvas.cpp
+++ b/engine/canvas.cpp
@@ -81,9 +81,11 @@ void ui::Canvas::pick_update(int plane)
         {
             // copy to tmp2 for layer blending
             glActiveTexture(GL_TEXTURE0); // TODO: maybe remove this line
+            #ifndef __IOS__
             m_tex2[i].bind();
             glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, m_width, m_height);
             m_tex2[i].unbind();
+            #endif
             
             m_layers[layer_index].m_rtt[i].bindTexture();
             glActiveTexture(GL_TEXTURE1);
@@ -122,12 +124,12 @@ glm::vec4 ui::Canvas::pick_get(glm::vec2 canvas_loc)
     glm::vec3 ray_dir;
     glm::vec3 hit_pos;
     glm::vec3 hit_normal;
+    glm::vec2 fb_pos;
     int plane_id;
-    if (point_trace(canvas_loc, ray_origin, ray_dir, hit_pos, hit_normal, plane_id))
+    if (point_trace(canvas_loc, ray_origin, ray_dir, hit_pos, fb_pos, hit_normal, plane_id))
     {
         pick_update(plane_id);
-        glm::vec2 fbpos = (hit_pos.xy() * 0.5f + 0.5f) * glm::vec2(m_width, m_height);
-        int i = (int)fbpos.x + (int)fbpos.y * m_width;
+        int i = (int)fb_pos.x + (int)fb_pos.y * m_width;
         return glm::vec4(m_pick_data[plane_id][i]) / 255.f;
     }
     return {0,0,0,1};
@@ -229,21 +231,21 @@ void ui::Canvas::stroke_draw()
         else
         {
             glDisable(GL_BLEND);
-            if (m_state == kCanvasMode::Erase)
-            {
-                ShaderManager::use(ui::kShader::StrokeErase);
-                //ShaderManager::u_vec4(kShaderUniform::Col, m_brush.m_tip_color);
-            }
-            else if(m_layers[m_current_layer_idx].m_alpha_locked)
-            {
-                ShaderManager::use(kShader::StrokeLock);
-                ShaderManager::u_vec4(kShaderUniform::Col, m_brush.m_tip_color);
-                ShaderManager::u_int(kShaderUniform::TexMask, 2); // alpha mask
-                glActiveTexture(GL_TEXTURE2);
-                m_layers[m_current_layer_idx].m_rtt[i].bindTexture();
-                glActiveTexture(GL_TEXTURE1);
-            }
-            else
+//            if (0 && m_state == kCanvasMode::Erase)
+//            {
+//                ShaderManager::use(ui::kShader::StrokeErase);
+//                //ShaderManager::u_vec4(kShaderUniform::Col, m_brush.m_tip_color);
+//            }
+//            else if(m_layers[m_current_layer_idx].m_alpha_locked)
+//            {
+//                ShaderManager::use(kShader::StrokeLock);
+//                ShaderManager::u_vec4(kShaderUniform::Col, m_brush.m_tip_color);
+//                ShaderManager::u_int(kShaderUniform::TexMask, 2); // alpha mask
+//                glActiveTexture(GL_TEXTURE2);
+//                m_layers[m_current_layer_idx].m_rtt[i].bindTexture();
+//                glActiveTexture(GL_TEXTURE1);
+//            }
+//            else
             {
                 ShaderManager::use(ui::kShader::Stroke);
                 ShaderManager::u_vec4(kShaderUniform::Col, m_brush.m_tip_color);
@@ -311,10 +313,12 @@ void ui::Canvas::stroke_draw()
                 glm::vec2 pad(1);
                 glm::ivec2 tex_pos = glm::clamp(glm::floor(bb_min) - pad , { 0, 0 }, { m_width, m_height });
                 glm::ivec2 tex_sz  = glm::clamp(glm::ceil(bb_sz ) + pad*2.f, { 0, 0 }, (glm::vec2)(glm::ivec2(m_width, m_height) - tex_pos));
+                #ifndef __IOS__
                 glCopyTexSubImage2D(GL_TEXTURE_2D, 0,
                                     tex_pos.x, tex_pos.y,
                                     tex_pos.x, tex_pos.y,
                                     tex_sz.x, tex_sz.y);
+                #endif
                 
                 m_dirty_box[i].xy = glm::min(m_dirty_box[i].xy(), (glm::vec2)tex_pos);
                 m_dirty_box[i].zw = glm::max(m_dirty_box[i].zw(), (glm::vec2)(tex_pos + tex_sz));
@@ -358,11 +362,10 @@ void ui::Canvas::stroke_draw()
     }
 }
 bool ui::Canvas::point_trace(glm::vec2 loc, glm::vec3& ray_origin, glm::vec3& ray_dir,
-                             glm::vec3& hit_pos, glm::vec3& hit_normal, int& out_plane_id)
+                             glm::vec3& hit_pos, glm::vec2& fb_pos, glm::vec3& hit_normal, int& out_plane_id)
 {
     point_unproject(loc, { 0, 0, m_box.zw }, m_mv, m_proj, ray_origin, ray_dir);
     glm::vec3 hit;
-    glm::vec2 fb_pos;
     for (int i = 0; i < 6; i++)
     {
         if (ray_intersect(ray_origin, ray_dir, m_plane_origin[i], m_plane_normal[i], m_plane_tangent[i], hit))
@@ -450,7 +453,7 @@ void ui::Canvas::stroke_commit()
 
     for (int i = 0; i < 6; i++)
     {
-        m_dirty_box[i] = glm::vec4(0, 0, m_width, m_height); // reset bounding box
+        //m_dirty_box[i] = glm::vec4(0, 0, m_width, m_height); // reset bounding box
         if (!m_dirty_face[i])
             continue; // no stroke on this face, skip it
 
@@ -483,21 +486,53 @@ void ui::Canvas::stroke_commit()
         m_sampler_bg.bind(1);
         if (m_state == kCanvasMode::Erase)
         {
-            ShaderManager::use(ui::kShader::Texture);
+            ui::ShaderManager::use(kShader::CompErase);
+            ui::ShaderManager::u_int(kShaderUniform::Tex, 0);
+            ui::ShaderManager::u_int(kShaderUniform::TexStroke, 1);
+            ui::ShaderManager::u_float(kShaderUniform::Alpha, m_current_stroke->m_brush.m_tip_opacity);
+            ShaderManager::u_mat4(kShaderUniform::MVP, glm::ortho(-.5f, .5f, -.5f, .5f, -1.f, 1.f));
+
+            glActiveTexture(GL_TEXTURE0);
+            m_tex2[i].bind();
+            glActiveTexture(GL_TEXTURE1);
+            m_tmp[i].bindTexture();
+            m_plane.draw_fill();
+            m_tmp[i].unbindTexture();
+            glActiveTexture(GL_TEXTURE0);
+            m_tex2[i].unbind();
         }
         else
         {
-            ShaderManager::use(ui::kShader::StrokeLayer);
-            ShaderManager::u_int(kShaderUniform::TexBG, 1);
-            ShaderManager::u_float(kShaderUniform::Alpha, m_current_stroke->m_brush.m_tip_opacity);
+            ui::ShaderManager::use(kShader::CompDraw);
+            ui::ShaderManager::u_int(kShaderUniform::Tex, 0);
+            ui::ShaderManager::u_int(kShaderUniform::TexStroke, 1);
+            ui::ShaderManager::u_float(kShaderUniform::Alpha, m_current_stroke->m_brush.m_tip_opacity);
+            ShaderManager::u_mat4(kShaderUniform::MVP, glm::ortho(-.5f, .5f, -.5f, .5f, -1.f, 1.f));
+
+            glActiveTexture(GL_TEXTURE0);
+            m_tex2[i].bind();
+            glActiveTexture(GL_TEXTURE1);
+            m_tmp[i].bindTexture();
+            m_plane.draw_fill();
+            m_tmp[i].unbindTexture();
+            glActiveTexture(GL_TEXTURE0);
+            m_tex2[i].unbind();
         }
-        ShaderManager::u_int(kShaderUniform::Tex, 0);
-        ShaderManager::u_mat4(kShaderUniform::MVP, glm::ortho(-.5f, .5f, -.5f, .5f, -1.f, 1.f));
-        m_plane.draw_fill();
-        m_sampler.unbind();
-        m_sampler_bg.unbind();
-        m_tex2[i].unbind();
-        m_tmp[i].unbindTexture();
+//        else
+//        {
+//            ShaderManager::use(ui::kShader::StrokeLayer);
+//            ShaderManager::u_int(kShaderUniform::TexBG, 1);
+//            ShaderManager::u_int(kShaderUniform::Lock, m_layers[m_current_layer_idx].m_alpha_locked);
+//            ShaderManager::u_float(kShaderUniform::Alpha, m_current_stroke->m_brush.m_tip_opacity);
+//
+//            ShaderManager::u_int(kShaderUniform::Tex, 0);
+//            ShaderManager::u_mat4(kShaderUniform::MVP, glm::ortho(-.5f, .5f, -.5f, .5f, -1.f, 1.f));
+//            m_plane.draw_fill();
+//            m_sampler.unbind();
+//            m_sampler_bg.unbind();
+//            m_tex2[i].unbind();
+//            m_tmp[i].unbindTexture();
+//        }
         
         m_layers[m_current_layer_idx].m_rtt[i].unbindFramebuffer();
     }
@@ -539,15 +574,15 @@ void ui::Canvas::stroke_start(glm::vec2 point, float pressure, const ui::Brush&
         m_dirty_box[i] = glm::vec4(m_width, m_height, 0, 0); // reset bounding box
         m_dirty_face[i] = false;
         
-        if (m_state == kCanvasMode::Erase)
-        {
-            m_layers[m_current_layer_idx].m_rtt[i].bindFramebuffer();
-            m_tmp[i].bindTexture();
-            glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, m_width, m_height);
-            m_tmp[i].unbindTexture();
-            m_layers[m_current_layer_idx].m_rtt[i].unbindFramebuffer();
-        }
-        else
+//        if (m_state == kCanvasMode::Erase || m_layers[m_current_layer_idx].m_alpha_locked)
+//        {
+//            m_layers[m_current_layer_idx].m_rtt[i].bindFramebuffer();
+//            m_tmp[i].bindTexture();
+//            glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, m_width, m_height);
+//            m_tmp[i].unbindTexture();
+//            m_layers[m_current_layer_idx].m_rtt[i].unbindFramebuffer();
+//        }
+//        else
         {
             m_tmp[i].bindFramebuffer();
             m_tmp[i].clear({ 0, 0, 0, 0 });
diff --git a/engine/canvas.h b/engine/canvas.h
index 3ec472c..ec4ae97 100644
--- a/engine/canvas.h
+++ b/engine/canvas.h
@@ -82,6 +82,7 @@ public:
     kCanvasMode m_state{ kCanvasMode::Draw };
     static std::vector<CanvasMode*> modes[];
     std::vector<CanvasMode*>* m_mode = nullptr;
+    kCanvasMode m_current_mode = kCanvasMode::Draw;
     static void set_mode(kCanvasMode mode)
     {
         if (I->m_mode)
@@ -89,6 +90,7 @@ public:
                 m->leave();
         I->m_mode = &modes[(int)mode];
         I->m_state = mode;
+        I->m_current_mode = mode;
     }
 
     std::vector<Layer::Snapshot> m_layers_snapshot;
@@ -126,7 +128,7 @@ public:
     void point_unproject(glm::vec2 loc, glm::vec4 vp, glm::mat4 camera, glm::mat4 proj,
                          glm::vec3 &out_origin, glm::vec3 &out_dir);
     bool point_trace(glm::vec2 loc, glm::vec3& ray_origin, glm::vec3& ray_dir,
-                     glm::vec3& hit_pos, glm::vec3& hit_normal, int& out_plane_id);
+                     glm::vec3& hit_pos, glm::vec2& fb_pos, glm::vec3& hit_normal, int& out_plane_id);
     bool point_trace_plane(glm::vec2 loc, glm::vec3& ray_origin, glm::vec3& ray_dir,
                      glm::vec3& hit_pos, glm::vec3& hit_normal, glm::vec2& hit_fb_pos, int plane_id);
 };
diff --git a/engine/canvas_modes.cpp b/engine/canvas_modes.cpp
index 6a6b1a4..ba82a58 100644
--- a/engine/canvas_modes.cpp
+++ b/engine/canvas_modes.cpp
@@ -76,6 +76,7 @@ void CanvasModePen::on_MouseEvent(MouseEvent* me, glm::vec2& loc)
             {
                 m_picking = true;
                 canvas->pick_start();
+                //canvas->m_show_tmp = true;
             }
             else
             {
@@ -93,6 +94,7 @@ void CanvasModePen::on_MouseEvent(MouseEvent* me, glm::vec2& loc)
             if (m_dragging && m_picking)
             {
                 node->mouse_release();
+                //canvas->m_show_tmp = false;
 
                 glm::vec4 pix = canvas->pick_get(loc);
                 auto hsv = convert_rgb2hsv(glm::vec3(pix[0], pix[1], pix[2]));
@@ -230,7 +232,8 @@ void CanvasModeGrid::on_MouseEvent(MouseEvent* me, glm::vec2& loc)
         {
             node->mouse_capture();
             glm::vec3 ro, rd, hit_o, hit_d;
-            if (canvas->point_trace(loc, ro, rd, hit_o, hit_d, m_plane_id))
+            glm::vec2 fb_pos;
+            if (canvas->point_trace(loc, ro, rd, hit_o, fb_pos, hit_d, m_plane_id))
             {
                 m_lines.push_back({ hit_o, hit_d });
                 origin = hit_o;
@@ -418,8 +421,9 @@ void CanvasModeFill::on_MouseEvent(MouseEvent* me, glm::vec2& loc)
     case kEventType::MouseMove:
     {
         glm::vec3 ro, rd, hit_o, hit_d;
+        glm::vec2 fb_pos;
         int plane_id;
-        if (m_dragging && canvas->point_trace(loc, ro, rd, hit_o, hit_d, plane_id))
+        if (m_dragging && canvas->point_trace(loc, ro, rd, hit_o, fb_pos, hit_d, plane_id))
         {
             ui::Shape::vertex_t v;
             v.pos = glm::vec4(hit_o, 1);
diff --git a/engine/node_canvas.cpp b/engine/node_canvas.cpp
index f139c0e..ec5bba5 100644
--- a/engine/node_canvas.cpp
+++ b/engine/node_canvas.cpp
@@ -2,6 +2,8 @@
 #include "log.h"
 #include "node_canvas.h"
 
+#define RES 1024
+
 Node* NodeCanvas::clone_instantiate() const
 {
     return new NodeCanvas();
@@ -11,7 +13,7 @@ void NodeCanvas::init()
 {
     m_mouse_ignore = false;
     m_canvas = std::make_unique<ui::Canvas>();
-    m_canvas->create(512, 512);
+    m_canvas->create(RES, RES);
     m_sampler.create(GL_NEAREST);
     m_face_plane.create<1>(2, 2);
     m_line.create();
@@ -25,7 +27,7 @@ void NodeCanvas::init()
 void NodeCanvas::restore_context()
 {
     Node::restore_context();
-    m_canvas->create(512, 512);
+    m_canvas->create(RES, RES);
     m_sampler.create(GL_NEAREST);
     m_face_plane.create<1>(2, 2);
     m_canvas->snapshot_restore();
@@ -75,6 +77,7 @@ void NodeCanvas::draw()
 
 
     m_sampler.bind(0);
+    m_sampler.bind(1);
     auto blend = glIsEnabled(GL_BLEND);
 
     glEnable(GL_BLEND);
@@ -88,31 +91,60 @@ void NodeCanvas::draw()
         ui::ShaderManager::u_mat4(kShaderUniform::MVP, plane_mvp);
         m_face_plane.draw_fill();
 
-        ui::ShaderManager::use(kShader::TextureAlpha);
-        ui::ShaderManager::u_int(kShaderUniform::Tex, 0);
         for (auto layer_index : m_canvas->m_order)
         {
             if (m_canvas->m_layers[layer_index].m_opacity == .0f)
                 continue;
-            int z = m_canvas->m_order.size() - layer_index;
+            int z = (int)m_canvas->m_order.size() - layer_index;
             auto plane_mvp_z = proj * camera * glm::scale(glm::vec3(z)) * m_canvas->m_plane_transform[plane_index] * glm::translate(glm::vec3(0, 0, -1));
-            ui::ShaderManager::u_mat4(kShaderUniform::MVP, plane_mvp_z);
-            if (!(m_canvas->m_state == ui::Canvas::kCanvasMode::Erase &&
-                m_canvas->m_show_tmp && m_canvas->m_current_layer_idx == layer_index))
+            
+            if (m_canvas->m_state == ui::Canvas::kCanvasMode::Erase && m_canvas->m_show_tmp && m_canvas->m_current_layer_idx == layer_index)
             {
-                ui::ShaderManager::u_float(kShaderUniform::Alpha, m_canvas->m_layers[layer_index].m_opacity);
-                m_canvas->m_layers[layer_index].m_rtt[plane_index].bindTexture();
-                m_face_plane.draw_fill();
-                m_canvas->m_layers[layer_index].m_rtt[plane_index].unbindTexture();
+                ui::ShaderManager::use(kShader::CompErase);
+                ui::ShaderManager::u_int(kShaderUniform::Tex, 0);
+                ui::ShaderManager::u_int(kShaderUniform::TexStroke, 1);
+                ui::ShaderManager::u_float(kShaderUniform::Alpha, m_canvas->m_current_stroke->m_brush.m_tip_opacity);
             }
-            if (m_canvas->m_show_tmp && m_canvas->m_current_layer_idx == layer_index)
+            else if(m_canvas->m_show_tmp && m_canvas->m_current_layer_idx == layer_index)
             {
-                ui::ShaderManager::u_float(kShaderUniform::Alpha,
-                    m_canvas->m_current_stroke->m_brush.m_tip_opacity * m_canvas->m_layers[layer_index].m_opacity);
+                ui::ShaderManager::use(kShader::CompDraw);
+                ui::ShaderManager::u_int(kShaderUniform::Tex, 0);
+                ui::ShaderManager::u_int(kShaderUniform::TexStroke, 1);
+                ui::ShaderManager::u_float(kShaderUniform::Alpha, m_canvas->m_current_stroke->m_brush.m_tip_opacity);
+            }
+            else
+            {
+                ui::ShaderManager::use(kShader::TextureAlpha);
+                ui::ShaderManager::u_int(kShaderUniform::Tex, 0);
+                ui::ShaderManager::u_float(kShaderUniform::Alpha, m_canvas->m_layers[layer_index].m_opacity);
+            }
+            ui::ShaderManager::u_mat4(kShaderUniform::MVP, plane_mvp_z);
+            ui::ShaderManager::u_int(kShaderUniform::Lock, m_canvas->m_layers[m_canvas->m_current_layer_idx].m_alpha_locked);
+
+//            if (!(m_canvas->m_state == ui::Canvas::kCanvasMode::Erase &&
+//                m_canvas->m_show_tmp && m_canvas->m_current_layer_idx == layer_index))
+            {
+                glActiveTexture(GL_TEXTURE0);
+                m_canvas->m_layers[layer_index].m_rtt[plane_index].bindTexture();
+                glActiveTexture(GL_TEXTURE1);
                 m_canvas->m_tmp[plane_index].bindTexture();
                 m_face_plane.draw_fill();
                 m_canvas->m_tmp[plane_index].unbindTexture();
+                glActiveTexture(GL_TEXTURE0);
+                m_canvas->m_layers[layer_index].m_rtt[plane_index].unbindTexture();
             }
+//            if (m_canvas->m_show_tmp && m_canvas->m_current_layer_idx == layer_index)
+//            {
+//                ui::ShaderManager::use(kShader::TextureAlpha);
+//                ui::ShaderManager::u_int(kShaderUniform::Tex, 0);
+//                ui::ShaderManager::u_float(kShaderUniform::Alpha, m_canvas->m_layers[layer_index].m_opacity);
+//                ui::ShaderManager::u_mat4(kShaderUniform::MVP, plane_mvp_z);
+//                ui::ShaderManager::u_float(kShaderUniform::Alpha,
+//                    m_canvas->m_current_stroke->m_brush.m_tip_opacity * m_canvas->m_layers[layer_index].m_opacity);
+//                m_canvas->m_tmp[plane_index].bindTexture();
+//                m_face_plane.draw_fill();
+//                m_canvas->m_tmp[plane_index].unbindTexture();
+//            }
         }
     }
     glDisable(GL_DEPTH_TEST);
diff --git a/engine/node_dialog_layer_rename.cpp b/engine/node_dialog_layer_rename.cpp
new file mode 100644
index 0000000..7a4b511
--- /dev/null
+++ b/engine/node_dialog_layer_rename.cpp
@@ -0,0 +1,47 @@
+#include "pch.h"
+#include "log.h"
+#include "node_dialog_layer_rename.h"
+#include "canvas.h"
+#include "node_image_texture.h"
+
+Node* NodeDialogLayerRename::clone_instantiate() const
+{
+    return new NodeDialogLayerRename();
+}
+
+void NodeDialogLayerRename::clone_finalize(Node* dest) const
+{
+    NodeDialogLayerRename* n = static_cast<NodeDialogLayerRename*>(dest);
+    n->init_controls();
+}
+
+void NodeDialogLayerRename::init()
+{
+    auto tpl = static_cast<const NodeBorder*>(init_template("dialog-layer-rename"));
+    m_color = tpl->m_color;
+    m_border_color = tpl->m_border_color;;
+    m_thinkness = tpl->m_thinkness;;
+    init_controls();
+}
+
+void NodeDialogLayerRename::init_controls()
+{
+    btn_ok = find<NodeButton>("btn-ok");
+    btn_cancel = find<NodeButton>("btn-cancel");
+    input = find<NodeTextInput>("txt-input");
+    btn_cancel->on_click = [this](Node*) {
+        destroy();
+    };
+}
+
+void NodeDialogLayerRename::loaded()
+{
+//    ui::Image thumb = ui::Canvas::I->thumbnail_read(data_path);
+//    auto image_tex = find<NodeImageTexture>("thumb-tex");
+//    image_tex->tex.create(thumb);
+}
+
+std::string NodeDialogLayerRename::get_name()
+{
+    return input ? input->m_string : "";
+}
diff --git a/engine/node_dialog_layer_rename.h b/engine/node_dialog_layer_rename.h
new file mode 100644
index 0000000..bb43628
--- /dev/null
+++ b/engine/node_dialog_layer_rename.h
@@ -0,0 +1,19 @@
+#pragma once
+#include "node_border.h"
+#include "node_button.h"
+#include "node_text_input.h"
+
+class NodeDialogLayerRename : public NodeBorder
+{
+public:
+    NodeButton* btn_cancel;
+    NodeButton* btn_ok;
+    NodeTextInput* input;
+    std::string data_path;
+    virtual Node* clone_instantiate() const override;
+    virtual void clone_finalize(Node* dest) const override;
+    virtual void init() override;
+    void init_controls();
+    virtual void loaded() override;
+    std::string get_name();
+};
diff --git a/engine/shader.h b/engine/shader.h
index 2a94c8b..0c765d3 100644
--- a/engine/shader.h
+++ b/engine/shader.h
@@ -10,6 +10,8 @@ enum class kShaderUniform : uint16_t
     TexFG = const_hash("tex_fg"),
     TexBG = const_hash("tex_bg"),
     TexMask = const_hash("tex_mask"),
+    TexStroke = const_hash("tex_stroke"),
+    Lock = const_hash("lock"),
     Col = const_hash("col"),
     Tof = const_hash("tof"),
     Tsz = const_hash("tsz"),
@@ -23,16 +25,18 @@ enum class kShader : uint16_t
     ColorQuad   = const_hash("color-quad"),
     ColorHue    = const_hash("color-hue"),
     Texture     = const_hash("texture"),
-    TextureAlpha = const_hash("texture-alpha"),
+    TextureAlpha= const_hash("texture-alpha"),
+    CompErase   = const_hash("comp-erase"),
+    CompDraw    = const_hash("comp-draw"),
     UVs         = const_hash("uvs"),
     Font        = const_hash("font"),
     Atlas       = const_hash("atlas"),
     Stroke      = const_hash("stroke"),
-    StrokeLock = const_hash("stroke-lock"),
+    StrokeLock  = const_hash("stroke-lock"),
     StrokeErase = const_hash("stroke-erase"),
     StrokeLayer = const_hash("stroke-layer"),
     Checkerboard= const_hash("checkerboard"),
-    Equirect = const_hash("equirect"),
+    Equirect    = const_hash("equirect"),
 };
 
 class Shader
@@ -67,4 +71,4 @@ public:
     static void invalidate();
 };
 
-}
\ No newline at end of file
+}