Re-implement alpha based in shaders

Author: GabrielBRDeveloper

res/layout/example_list.xml

@@ -7,6 +7,5 @@
         width="200dp"
         height="200dp"
         textSize="24dp"
-        background="@drawable/test_path"
         text="MasterUI"/>
 </LinearLayout>

res/raw/view_renderer.frag

@@ -1,6 +1,7 @@
 precision mediump float;
 
 #define ALPHA float(params[1])/255.0
+#define MODE params[0]
 
 uniform int[8] params;
 
@@ -10,6 +11,16 @@ varying vec2 uv;
 
 void main() {
     vec4 color = texture2D(texture, uv);
+    color.a *= ALPHA;
+    if(color.a <= 0.0) discard;
+
+    if(MODE == 0) {
+        color.rgb *= color.a;
+    } else if(ALPHA == 1.0){
+        if(color.a >= 1.0)discard;
+    } else {
+        discard;
+    }
 
     gl_FragColor = color;
 }

src/br/nullexcept/mux/app/applets/ClipboardApplet.java

@@ -4,5 +4,6 @@
 
 public abstract class ClipboardApplet extends Applet {
     public abstract String getContent();
+    public abstract boolean hasContent();
     public abstract void setContent(String content);
 }

src/br/nullexcept/mux/core/texel/GLTexel.java

@@ -61,11 +61,12 @@ public static void drawViewLayers(float[][] vertices, int[] textures, float[] al
          *
          * dstColor = src.rgb * X + dest.rgb * Y;
          */
+        glBlendEquation(GL_FUNC_ADD);
         glBlendFuncSeparate(
                 GL_ONE,
                 GL_ONE_MINUS_SRC_ALPHA,
                 GL_ONE,
-                GL_ONE_MINUS_SRC_ALPHA
+                GL_ONE
         );
 
 
@@ -78,31 +79,28 @@ public static void drawViewLayers(float[][] vertices, int[] textures, float[] al
         for (int i = 0; i < vertices.length; i++) {
             bufferRect.put(vertices[i]);
             bufferRect.position(0);
-
             glBindTexture(GL_TEXTURE_2D, textures[i]);
 
             glVertexAttribPointer(program.position, 2, GL_FLOAT, false, 0, bufferRect);
             glVertexAttribPointer(program.uv, 2, GL_FLOAT, false, 0, bufferUV);
-
-            glUniform1iv(program.params, new int[]{});
-
             glUniform1i(program.texture, GL_TEXTURE_2D);
-            glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
-            glFinish();
+
+            /**
+             * @TODO: Need better implement for fix dark border + alpha, with low gpu cost
+             * MODE 0 = FILL
+             * MODE 1 = "ANTILIAZING""
+             */
+            for (int x = 0; x < 2; x++) {
+                glUniform1iv(program.params, new int[]{
+                        x, Math.round(alphas[i] * 255)
+                });
+                glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+            }
         }
 
         program.unbind();
         glBindTexture(GL_TEXTURE_2D, 0);
-    }
-
-
-    private static FloatBuffer allocateVertices(float[][] vectors) {
-        FloatBuffer vertx = BufferUtils.createFloatBuffer(vectors.length*vectors[0].length);
-        vertx.position(0);
-        for (int i = 0; i< vectors.length; i++)
-            vertx.put(vectors[i]);
-        vertx.position(0);
-        return vertx;
+        glDisable(GL_BLEND);
     }
 
     public static void drawTexture(float x, float y, float width, float height, GLProgram program, int texture){

src/br/nullexcept/mux/core/texel/GlfwApplets.java

@@ -17,6 +17,12 @@ public String getContent() {
                 return GLFW.glfwGetClipboardString(C.GLFW_CONTEXT);
             }
 
+            @Override
+            public boolean hasContent() {
+                String content = getContent();
+                return content != null && content.length() > 0;
+            }
+
             @Override
             public void setContent(String content) { 
                 GLFW.glfwSetClipboardString(C.GLFW_CONTEXT, content);

src/br/nullexcept/mux/core/texel/ViewRenderer.java

@@ -1,6 +1,7 @@
 package br.nullexcept.mux.core.texel;
 
 import br.nullexcept.mux.graphics.Rect;
+import br.nullexcept.mux.utils.Log;
 import br.nullexcept.mux.view.View;
 import br.nullexcept.mux.view.ViewGroup;
 
@@ -26,7 +27,6 @@ public void drawInternal(CanvasTexel canvas, View view){
             canvas.getFramebuffer().resize(bounds.width(), bounds.height());
         }
         canvas.begin();
-        canvas.alpha(view.getAlpha());
         canvas.reset();
         view.onDraw(canvas);
         if (view instanceof ViewGroup){

src/br/nullexcept/mux/core/texel/WindowContainer.java

@@ -184,7 +184,7 @@ public void performInputEvent(Event event) {
             performHover((MouseEvent)event);
             if(event.getTarget() == -1){
                 dispatchEvent(event);
-            } else {
+            } else if (renders.containsKey(event.getTarget())){
                 View target = renders.get(event.getTarget()).view;
                 Rect visibleBounds = target.getVisibleBounds();
                 ((MouseEvent) event).transform(-visibleBounds.left, -visibleBounds.top);
@@ -242,6 +242,7 @@ private void showMenu() {
         for (Menu.Group group: currentMenu.getGroups()) {
             for (Menu.Item item: group.getItems()) {
                 ViewGroup v = inflater.inflate("default_widget_menu_item");
+                v.setAlpha(item.isEnable() ? 1.0f : 0.5f );
                 ImageView icon = v.findViewByTag("icon");
                 if (item.getIcon() == null) {
                     icon.getParent().removeChild(icon);

src/br/nullexcept/mux/view/Menu.java

@@ -49,6 +49,16 @@ public List<Item> getItems() {
             return items;
         }
 
+        public Item findItemById(String id) {
+            for (Item item: items) {
+                if (item.id == id) {
+                    return item;
+                }
+            }
+            return null;
+        }
+
+
         public String getTitle() {
             return title;
         }
@@ -58,11 +68,25 @@ public static class Item {
         private final String id;
         private final String title;
         private final Drawable icon;
+        private boolean enable;
 
         public Item(String id, String title, Drawable icon) {
+            this(id, title, icon, true);
+        }
+
+        public Item(String id, String title, Drawable icon, boolean enable) {
             this.id = id;
             this.title = title;
             this.icon = icon;
+            this.enable = enable;
+        }
+
+        public void setEnable(boolean enable) {
+            this.enable = enable;
+        }
+
+        public boolean isEnable() {
+            return enable;
         }
 
         public String getTitle() {

src/br/nullexcept/mux/widget/EditText.java

@@ -172,8 +172,8 @@ public void setText(CharSequence text) {
 
     @Override
     public boolean onCreateContextMenu(Menu menu) {
+        ClipboardApplet clipboard = getContext().getApplet(Context.CLIPBOARD_APPLET);
         menu.setOnClickListener(item -> {
-            ClipboardApplet clipboard = getContext().getApplet(Context.CLIPBOARD_APPLET);
             switch (item.getId()) {
                 case "paste": {
                     pasteFromClipboard();
@@ -189,6 +189,7 @@ public boolean onCreateContextMenu(Menu menu) {
             }
         });
 
+        this.menu.findItemById("paste").setEnable(clipboard.hasContent());
         menu.add(this.menu);
         return true;
     }
@@ -213,6 +214,8 @@ private void copyToClipboard() {
 
     private void pasteFromClipboard() {
         String content = ((ClipboardApplet)getContext().getApplet(Context.CLIPBOARD_APPLET)).getContent();
+        if (content == null)return;
+
         if(selection.length() > 0){
             text.delete();
         }